/* Standard problems for dataflow support routines.
- Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
- Free Software Foundation, Inc.
- Originally contributed by Michael P. Hayes
+ Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
+ 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+ Originally contributed by Michael P. Hayes
(m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com)
Major rewrite contributed by Danny Berlin (dberlin@dberlin.org)
and Kenneth Zadeck (zadeck@naturalbridge.com).
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "recog.h"
#include "function.h"
#include "regs.h"
-#include "output.h"
#include "alloc-pool.h"
#include "flags.h"
#include "hard-reg-set.h"
#include "basic-block.h"
#include "sbitmap.h"
#include "bitmap.h"
+#include "target.h"
#include "timevar.h"
#include "df.h"
-#include "vecprim.h"
#include "except.h"
+#include "dce.h"
+#include "vecprim.h"
+/* Note that turning REG_DEAD_DEBUGGING on will cause
+ gcc.c-torture/unsorted/dump-noaddr.c to fail because it prints
+ addresses in the dumps. */
#if 0
#define REG_DEAD_DEBUGGING
#endif
#define DF_SPARSE_THRESHOLD 32
-static bitmap seen_in_block = NULL;
-static bitmap seen_in_insn = NULL;
-static void df_ri_dump (struct dataflow *, FILE *);
+static bitmap_head seen_in_block;
+static bitmap_head seen_in_insn;
\f
/*----------------------------------------------------------------------------
Public functions access functions for the dataflow problems.
----------------------------------------------------------------------------*/
-
-/* Create a du or ud chain from SRC to DST and link it into SRC. */
-
-struct df_link *
-df_chain_create (struct dataflow *dflow, struct df_ref *src, struct df_ref *dst)
-{
- struct df_link *head = DF_REF_CHAIN (src);
- struct df_link *link = pool_alloc (dflow->block_pool);;
-
- DF_REF_CHAIN (src) = link;
- link->next = head;
- link->ref = dst;
- return link;
-}
-
-
-/* Delete a du or ud chain for REF. If LINK is NULL, delete all
- chains for ref and check to see if the reverse chains can also be
- deleted. If LINK is not NULL it must be a link off of ref. In
- this case, the other end is not deleted. */
-
-void
-df_chain_unlink (struct dataflow *dflow, struct df_ref *ref, struct df_link *link)
-{
- struct df_link *chain = DF_REF_CHAIN (ref);
- if (link)
- {
- /* Link was the first element in the chain. */
- if (chain == link)
- DF_REF_CHAIN (ref) = link->next;
- else
- {
- /* Link is an internal element in the chain. */
- struct df_link *prev = chain;
- while (chain)
- {
- if (chain == link)
- {
- prev->next = chain->next;
- break;
- }
- prev = chain;
- chain = chain->next;
- }
- }
- pool_free (dflow->block_pool, link);
- }
- else
- {
- /* If chain is NULL here, it was because of a recursive call
- when the other flavor of chains was not built. Just run thru
- the entire chain calling the other side and then deleting the
- link. */
- while (chain)
- {
- struct df_link *next = chain->next;
- /* Delete the other side if it exists. */
- df_chain_unlink (dflow, chain->ref, chain);
- chain = next;
- }
- }
-}
-
-
-/* Copy the du or ud chain starting at FROM_REF and attach it to
- TO_REF. */
-
-void
-df_chain_copy (struct dataflow *dflow,
- struct df_ref *to_ref,
- struct df_link *from_ref)
-{
- while (from_ref)
- {
- df_chain_create (dflow, to_ref, from_ref->ref);
- from_ref = from_ref->next;
- }
-}
-
-
-/* Get the live in set for BB no matter what problem happens to be
- defined. */
+/* Get the live at out set for BB no matter what problem happens to be
+ defined. This function is used by the register allocators who
+ choose different dataflow problems depending on the optimization
+ level. */
bitmap
-df_get_live_in (struct df *df, basic_block bb)
+df_get_live_out (basic_block bb)
{
- gcc_assert (df->problems_by_index[DF_LR]);
+ gcc_assert (df_lr);
- if (df->problems_by_index[DF_UREC])
- return DF_RA_LIVE_IN (df, bb);
- else if (df->problems_by_index[DF_UR])
- return DF_LIVE_IN (df, bb);
- else
- return DF_UPWARD_LIVE_IN (df, bb);
+ if (df_live)
+ return DF_LIVE_OUT (bb);
+ else
+ return DF_LR_OUT (bb);
}
-
-/* Get the live out set for BB no matter what problem happens to be
- defined. */
+/* Get the live at in set for BB no matter what problem happens to be
+ defined. This function is used by the register allocators who
+ choose different dataflow problems depending on the optimization
+ level. */
bitmap
-df_get_live_out (struct df *df, basic_block bb)
+df_get_live_in (basic_block bb)
{
- gcc_assert (df->problems_by_index[DF_LR]);
+ gcc_assert (df_lr);
- if (df->problems_by_index[DF_UREC])
- return DF_RA_LIVE_OUT (df, bb);
- else if (df->problems_by_index[DF_UR])
- return DF_LIVE_OUT (df, bb);
- else
- return DF_UPWARD_LIVE_OUT (df, bb);
+ if (df_live)
+ return DF_LIVE_IN (bb);
+ else
+ return DF_LR_IN (bb);
}
-
/*----------------------------------------------------------------------------
Utility functions.
----------------------------------------------------------------------------*/
/* Generic versions to get the void* version of the block info. Only
used inside the problem instance vectors. */
-/* Grow the bb_info array. */
-
-void
-df_grow_bb_info (struct dataflow *dflow)
-{
- unsigned int new_size = last_basic_block + 1;
- if (dflow->block_info_size < new_size)
- {
- new_size += new_size / 4;
- dflow->block_info = xrealloc (dflow->block_info,
- new_size *sizeof (void*));
- memset (dflow->block_info + dflow->block_info_size, 0,
- (new_size - dflow->block_info_size) *sizeof (void *));
- dflow->block_info_size = new_size;
- }
-}
-
/* Dump a def-use or use-def chain for REF to FILE. */
void
for (; link; link = link->next)
{
fprintf (file, "%c%d(bb %d insn %d) ",
- DF_REF_REG_DEF_P (link->ref) ? 'd' : 'u',
+ DF_REF_REG_DEF_P (link->ref)
+ ? 'd'
+ : (DF_REF_FLAGS (link->ref) & DF_REF_IN_NOTE) ? 'e' : 'u',
DF_REF_ID (link->ref),
DF_REF_BBNO (link->ref),
- DF_REF_INSN (link->ref) ? DF_REF_INSN_UID (link->ref) : -1);
+ DF_REF_IS_ARTIFICIAL (link->ref)
+ ? -1 : DF_REF_INSN_UID (link->ref));
}
fprintf (file, "}");
}
/* Print some basic block info as part of df_dump. */
-void
+void
df_print_bb_index (basic_block bb, FILE *file)
{
edge e;
edge_iterator ei;
- fprintf (file, "( ");
+ fprintf (file, "\n( ");
FOR_EACH_EDGE (e, ei, bb->preds)
{
basic_block pred = e->src;
- fprintf (file, "%d ", pred->index);
- }
+ fprintf (file, "%d%s ", pred->index, e->flags & EDGE_EH ? "(EH)" : "");
+ }
fprintf (file, ")->[%d]->( ", bb->index);
FOR_EACH_EDGE (e, ei, bb->succs)
{
basic_block succ = e->dest;
- fprintf (file, "%d ", succ->index);
- }
- fprintf (file, ")\n");
-}
-
-
-/* Return a bitmap for REGNO from the cache MAPS. The bitmap is to
- contain COUNT bits starting at START. These bitmaps are not to be
- changed since there is a cache of them. */
-
-static inline bitmap
-df_ref_bitmap (bitmap *maps, unsigned int regno, int start, int count)
-{
- bitmap ids = maps[regno];
- if (!ids)
- {
- unsigned int i;
- unsigned int end = start + count;;
- ids = BITMAP_ALLOC (NULL);
- maps[regno] = ids;
- for (i = start; i < end; i++)
- bitmap_set_bit (ids, i);
+ fprintf (file, "%d%s ", succ->index, e->flags & EDGE_EH ? "(EH)" : "");
}
- return ids;
-}
-
-
-/* Make sure that the seen_in_insn and seen_in_block sbitmaps are set
- up correctly. */
-
-static void
-df_set_seen (void)
-{
- seen_in_block = BITMAP_ALLOC (NULL);
- seen_in_insn = BITMAP_ALLOC (NULL);
-}
-
-
-static void
-df_unset_seen (void)
-{
- BITMAP_FREE (seen_in_block);
- BITMAP_FREE (seen_in_insn);
+ fprintf (file, ")\n");
}
-
\f
/*----------------------------------------------------------------------------
- REACHING USES
+ REACHING DEFINITIONS
- Find the locations in the function where each use site for a pseudo
- can reach backwards. In and out bitvectors are built for each basic
+ Find the locations in the function where each definition site for a
+ pseudo reaches. In and out bitvectors are built for each basic
block. The id field in the ref is used to index into these sets.
See df.h for details.
-
-----------------------------------------------------------------------------*/
+ ----------------------------------------------------------------------------*/
/* This problem plays a large number of games for the sake of
- efficiency.
-
+ efficiency.
+
1) The order of the bits in the bitvectors. After the scanning
- phase, all of the uses are sorted. All of the uses for the reg 0
- are first, followed by all uses for reg 1 and so on.
-
- 2) There are two kill sets, one if the number of uses is less or
- equal to DF_SPARSE_THRESHOLD and another if it is greater.
+ phase, all of the defs are sorted. All of the defs for the reg 0
+ are first, followed by all defs for reg 1 and so on.
- <= : There is a bitmap for each register, uses_sites[N], that is
- built on demand. This bitvector contains a 1 for each use or reg
- N.
+ 2) There are two kill sets, one if the number of defs is less or
+ equal to DF_SPARSE_THRESHOLD and another if the number of defs is
+ greater.
+
+ <= : Data is built directly in the kill set.
> : One level of indirection is used to keep from generating long
strings of 1 bits in the kill sets. Bitvectors that are indexed
bits without actually generating a knockout vector.
The kill and sparse_kill and the dense_invalidated_by_call and
- sparse_invalidated_by call both play this game. */
+ sparse_invalidated_by_call both play this game. */
/* Private data used to compute the solution for this problem. These
data structures are not accessible outside of this module. */
-struct df_ru_problem_data
+struct df_rd_problem_data
{
-
- bitmap *use_sites; /* Bitmap of uses for each pseudo. */
- unsigned int use_sites_size; /* Size of use_sites. */
/* The set of defs to regs invalidated by call. */
- bitmap sparse_invalidated_by_call;
- /* The set of defs to regs invalidated by call for ru. */
- bitmap dense_invalidated_by_call;
+ bitmap_head sparse_invalidated_by_call;
+ /* The set of defs to regs invalidate by call for rd. */
+ bitmap_head dense_invalidated_by_call;
+ /* An obstack for the bitmaps we need for this problem. */
+ bitmap_obstack rd_bitmaps;
};
-/* Get basic block info. */
-
-struct df_ru_bb_info *
-df_ru_get_bb_info (struct dataflow *dflow, unsigned int index)
-{
- return (struct df_ru_bb_info *) dflow->block_info[index];
-}
-
-
-/* Set basic block info. */
-
-static void
-df_ru_set_bb_info (struct dataflow *dflow, unsigned int index,
- struct df_ru_bb_info *bb_info)
-{
- dflow->block_info[index] = bb_info;
-}
-
/* Free basic block info. */
static void
-df_ru_free_bb_info (struct dataflow *dflow,
- basic_block bb ATTRIBUTE_UNUSED,
+df_rd_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
void *vbb_info)
{
- struct df_ru_bb_info *bb_info = (struct df_ru_bb_info *) vbb_info;
+ struct df_rd_bb_info *bb_info = (struct df_rd_bb_info *) vbb_info;
if (bb_info)
{
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->sparse_kill);
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- pool_free (dflow->block_pool, bb_info);
+ bitmap_clear (&bb_info->kill);
+ bitmap_clear (&bb_info->sparse_kill);
+ bitmap_clear (&bb_info->gen);
+ bitmap_clear (&bb_info->in);
+ bitmap_clear (&bb_info->out);
}
}
-/* Allocate or reset bitmaps for DFLOW blocks. The solution bits are
+/* Allocate or reset bitmaps for DF_RD blocks. The solution bits are
not touched unless the block is new. */
-static void
-df_ru_alloc (struct dataflow *dflow,
- bitmap blocks_to_rescan ATTRIBUTE_UNUSED,
- bitmap all_blocks)
+static void
+df_rd_alloc (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
- unsigned int reg_size = max_reg_num ();
-
- if (!dflow->block_pool)
- dflow->block_pool = create_alloc_pool ("df_ru_block pool",
- sizeof (struct df_ru_bb_info), 50);
+ struct df_rd_problem_data *problem_data;
- if (dflow->problem_data)
+ if (df_rd->problem_data)
{
- unsigned int i;
- struct df_ru_problem_data *problem_data
- = (struct df_ru_problem_data *) dflow->problem_data;
-
- for (i = 0; i < problem_data->use_sites_size; i++)
- {
- bitmap bm = problem_data->use_sites[i];
- if (bm)
- {
- BITMAP_FREE (bm);
- problem_data->use_sites[i] = NULL;
- }
- }
-
- if (problem_data->use_sites_size < reg_size)
- {
- problem_data->use_sites
- = xrealloc (problem_data->use_sites, reg_size * sizeof (bitmap));
- memset (problem_data->use_sites + problem_data->use_sites_size, 0,
- (reg_size - problem_data->use_sites_size) * sizeof (bitmap));
- problem_data->use_sites_size = reg_size;
- }
-
- bitmap_clear (problem_data->sparse_invalidated_by_call);
- bitmap_clear (problem_data->dense_invalidated_by_call);
+ problem_data = (struct df_rd_problem_data *) df_rd->problem_data;
+ bitmap_clear (&problem_data->sparse_invalidated_by_call);
+ bitmap_clear (&problem_data->dense_invalidated_by_call);
}
- else
+ else
{
- struct df_ru_problem_data *problem_data = XNEW (struct df_ru_problem_data);
- dflow->problem_data = problem_data;
-
- problem_data->use_sites = XCNEWVEC (bitmap, reg_size);
- problem_data->use_sites_size = reg_size;
- problem_data->sparse_invalidated_by_call = BITMAP_ALLOC (NULL);
- problem_data->dense_invalidated_by_call = BITMAP_ALLOC (NULL);
+ problem_data = XNEW (struct df_rd_problem_data);
+ df_rd->problem_data = problem_data;
+
+ bitmap_obstack_initialize (&problem_data->rd_bitmaps);
+ bitmap_initialize (&problem_data->sparse_invalidated_by_call,
+ &problem_data->rd_bitmaps);
+ bitmap_initialize (&problem_data->dense_invalidated_by_call,
+ &problem_data->rd_bitmaps);
}
- df_grow_bb_info (dflow);
+ df_grow_bb_info (df_rd);
- /* Because of the clustering of all def sites for the same pseudo,
+ /* Because of the clustering of all use sites for the same pseudo,
we have to process all of the blocks before doing the
analysis. */
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- struct df_ru_bb_info *bb_info = df_ru_get_bb_info (dflow, bb_index);
- if (bb_info)
- {
- bitmap_clear (bb_info->kill);
- bitmap_clear (bb_info->sparse_kill);
- bitmap_clear (bb_info->gen);
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb_index);
+
+ /* When bitmaps are already initialized, just clear them. */
+ if (bb_info->kill.obstack)
+ {
+ bitmap_clear (&bb_info->kill);
+ bitmap_clear (&bb_info->sparse_kill);
+ bitmap_clear (&bb_info->gen);
}
else
- {
- bb_info = (struct df_ru_bb_info *) pool_alloc (dflow->block_pool);
- df_ru_set_bb_info (dflow, bb_index, bb_info);
- bb_info->kill = BITMAP_ALLOC (NULL);
- bb_info->sparse_kill = BITMAP_ALLOC (NULL);
- bb_info->gen = BITMAP_ALLOC (NULL);
- bb_info->in = BITMAP_ALLOC (NULL);
- bb_info->out = BITMAP_ALLOC (NULL);
+ {
+ bitmap_initialize (&bb_info->kill, &problem_data->rd_bitmaps);
+ bitmap_initialize (&bb_info->sparse_kill, &problem_data->rd_bitmaps);
+ bitmap_initialize (&bb_info->gen, &problem_data->rd_bitmaps);
+ bitmap_initialize (&bb_info->in, &problem_data->rd_bitmaps);
+ bitmap_initialize (&bb_info->out, &problem_data->rd_bitmaps);
}
}
+ df_rd->optional_p = true;
}
-/* Process a list of DEFs for df_ru_bb_local_compute. */
+/* Add the effect of the top artificial defs of BB to the reaching definitions
+ bitmap LOCAL_RD. */
-static void
-df_ru_bb_local_compute_process_def (struct dataflow *dflow,
- struct df_ru_bb_info *bb_info,
- struct df_ref *def,
- enum df_ref_flags top_flag)
+void
+df_rd_simulate_artificial_defs_at_top (basic_block bb, bitmap local_rd)
{
- struct df *df = dflow->df;
- while (def)
+ int bb_index = bb->index;
+ df_ref *def_rec;
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
- if ((top_flag == (DF_REF_FLAGS (def) & DF_REF_AT_TOP))
- /* If the def is to only part of the reg, it is as if it did
- not happen, since some of the bits may get thru. */
- && (!(DF_REF_FLAGS (def) & DF_REF_PARTIAL)))
+ df_ref def = *def_rec;
+ if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
{
- unsigned int regno = DF_REF_REGNO (def);
- unsigned int begin = DF_REG_USE_GET (df, regno)->begin;
- unsigned int n_uses = DF_REG_USE_GET (df, regno)->n_refs;
- if (!bitmap_bit_p (seen_in_block, regno))
- {
- /* The first def for regno in the insn, causes the kill
- info to be generated. Do not modify the gen set
- because the only values in it are the uses from here
- to the top of the block and this def does not effect
- them. */
- if (!bitmap_bit_p (seen_in_insn, regno))
- {
- if (n_uses > DF_SPARSE_THRESHOLD)
- bitmap_set_bit (bb_info->sparse_kill, regno);
- else
- {
- struct df_ru_problem_data * problem_data
- = (struct df_ru_problem_data *)dflow->problem_data;
- bitmap uses
- = df_ref_bitmap (problem_data->use_sites, regno,
- begin, n_uses);
- bitmap_ior_into (bb_info->kill, uses);
- }
- }
- bitmap_set_bit (seen_in_insn, regno);
- }
+ unsigned int dregno = DF_REF_REGNO (def);
+ if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL)))
+ bitmap_clear_range (local_rd,
+ DF_DEFS_BEGIN (dregno),
+ DF_DEFS_COUNT (dregno));
+ bitmap_set_bit (local_rd, DF_REF_ID (def));
}
- def = def->next_ref;
}
}
+/* Add the effect of the defs of INSN to the reaching definitions bitmap
+ LOCAL_RD. */
+
+void
+df_rd_simulate_one_insn (basic_block bb ATTRIBUTE_UNUSED, rtx insn,
+ bitmap local_rd)
+{
+ unsigned uid = INSN_UID (insn);
+ df_ref *def_rec;
+
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ unsigned int dregno = DF_REF_REGNO (def);
+ if ((!(df->changeable_flags & DF_NO_HARD_REGS))
+ || (dregno >= FIRST_PSEUDO_REGISTER))
+ {
+ if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL)))
+ bitmap_clear_range (local_rd,
+ DF_DEFS_BEGIN (dregno),
+ DF_DEFS_COUNT (dregno));
+ if (!(DF_REF_FLAGS (def)
+ & (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER)))
+ bitmap_set_bit (local_rd, DF_REF_ID (def));
+ }
+ }
+}
-/* Process a list of USEs for df_ru_bb_local_compute. */
+/* Process a list of DEFs for df_rd_bb_local_compute. This is a bit
+ more complicated than just simulating, because we must produce the
+ gen and kill sets and hence deal with the two possible representations
+ of kill sets. */
static void
-df_ru_bb_local_compute_process_use (struct df_ru_bb_info *bb_info,
- struct df_ref *use,
- enum df_ref_flags top_flag)
+df_rd_bb_local_compute_process_def (struct df_rd_bb_info *bb_info,
+ df_ref *def_rec,
+ int top_flag)
{
- while (use)
+ while (*def_rec)
{
- if (top_flag == (DF_REF_FLAGS (use) & DF_REF_AT_TOP))
+ df_ref def = *def_rec;
+ if (top_flag == (DF_REF_FLAGS (def) & DF_REF_AT_TOP))
{
- /* Add use to set of gens in this BB unless we have seen a
- def in a previous instruction. */
- unsigned int regno = DF_REF_REGNO (use);
- if (!bitmap_bit_p (seen_in_block, regno))
- bitmap_set_bit (bb_info->gen, DF_REF_ID (use));
+ unsigned int regno = DF_REF_REGNO (def);
+ unsigned int begin = DF_DEFS_BEGIN (regno);
+ unsigned int n_defs = DF_DEFS_COUNT (regno);
+
+ if ((!(df->changeable_flags & DF_NO_HARD_REGS))
+ || (regno >= FIRST_PSEUDO_REGISTER))
+ {
+ /* Only the last def(s) for a regno in the block has any
+ effect. */
+ if (!bitmap_bit_p (&seen_in_block, regno))
+ {
+ /* The first def for regno in insn gets to knock out the
+ defs from other instructions. */
+ if ((!bitmap_bit_p (&seen_in_insn, regno))
+ /* If the def is to only part of the reg, it does
+ not kill the other defs that reach here. */
+ && (!(DF_REF_FLAGS (def) &
+ (DF_REF_PARTIAL | DF_REF_CONDITIONAL | DF_REF_MAY_CLOBBER))))
+ {
+ if (n_defs > DF_SPARSE_THRESHOLD)
+ {
+ bitmap_set_bit (&bb_info->sparse_kill, regno);
+ bitmap_clear_range(&bb_info->gen, begin, n_defs);
+ }
+ else
+ {
+ bitmap_set_range (&bb_info->kill, begin, n_defs);
+ bitmap_clear_range (&bb_info->gen, begin, n_defs);
+ }
+ }
+
+ bitmap_set_bit (&seen_in_insn, regno);
+ /* All defs for regno in the instruction may be put into
+ the gen set. */
+ if (!(DF_REF_FLAGS (def)
+ & (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER)))
+ bitmap_set_bit (&bb_info->gen, DF_REF_ID (def));
+ }
+ }
}
- use = use->next_ref;
+ def_rec++;
}
}
-/* Compute local reaching use (upward exposed use) info for basic
- block BB. USE_INFO->REGS[R] caches the set of uses for register R. */
+/* Compute local reaching def info for basic block BB. */
+
static void
-df_ru_bb_local_compute (struct dataflow *dflow, unsigned int bb_index)
+df_rd_bb_local_compute (unsigned int bb_index)
{
- struct df *df = dflow->df;
basic_block bb = BASIC_BLOCK (bb_index);
- struct df_ru_bb_info *bb_info = df_ru_get_bb_info (dflow, bb_index);
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb_index);
rtx insn;
- /* Set when a def for regno is seen. */
- bitmap_clear (seen_in_block);
- bitmap_clear (seen_in_insn);
+ bitmap_clear (&seen_in_block);
+ bitmap_clear (&seen_in_insn);
-#ifdef EH_USES
- /* Variables defined in the prolog that are used by the exception
- handler. */
- df_ru_bb_local_compute_process_use (bb_info,
- df_get_artificial_uses (df, bb_index),
- DF_REF_AT_TOP);
-#endif
- df_ru_bb_local_compute_process_def (dflow, bb_info,
- df_get_artificial_defs (df, bb_index),
- DF_REF_AT_TOP);
+ /* Artificials are only hard regs. */
+ if (!(df->changeable_flags & DF_NO_HARD_REGS))
+ df_rd_bb_local_compute_process_def (bb_info,
+ df_get_artificial_defs (bb_index),
+ 0);
- FOR_BB_INSNS (bb, insn)
+ FOR_BB_INSNS_REVERSE (bb, insn)
{
unsigned int uid = INSN_UID (insn);
+
if (!INSN_P (insn))
continue;
- df_ru_bb_local_compute_process_use (bb_info,
- DF_INSN_UID_USES (df, uid), 0);
+ df_rd_bb_local_compute_process_def (bb_info,
+ DF_INSN_UID_DEFS (uid), 0);
- df_ru_bb_local_compute_process_def (dflow, bb_info,
- DF_INSN_UID_DEFS (df, uid), 0);
-
- bitmap_ior_into (seen_in_block, seen_in_insn);
- bitmap_clear (seen_in_insn);
+ /* This complex dance with the two bitmaps is required because
+ instructions can assign twice to the same pseudo. This
+ generally happens with calls that will have one def for the
+ result and another def for the clobber. If only one vector
+ is used and the clobber goes first, the result will be
+ lost. */
+ bitmap_ior_into (&seen_in_block, &seen_in_insn);
+ bitmap_clear (&seen_in_insn);
}
- /* Process the hardware registers that are always live. */
- df_ru_bb_local_compute_process_use (bb_info,
- df_get_artificial_uses (df, bb_index), 0);
-
- df_ru_bb_local_compute_process_def (dflow, bb_info,
- df_get_artificial_defs (df, bb_index), 0);
+ /* Process the artificial defs at the top of the block last since we
+ are going backwards through the block and these are logically at
+ the start. */
+ if (!(df->changeable_flags & DF_NO_HARD_REGS))
+ df_rd_bb_local_compute_process_def (bb_info,
+ df_get_artificial_defs (bb_index),
+ DF_REF_AT_TOP);
}
-/* Compute local reaching use (upward exposed use) info for each basic
- block within BLOCKS. */
+/* Compute local reaching def info for each basic block within BLOCKS. */
+
static void
-df_ru_local_compute (struct dataflow *dflow,
- bitmap all_blocks,
- bitmap rescan_blocks ATTRIBUTE_UNUSED)
+df_rd_local_compute (bitmap all_blocks)
{
- struct df *df = dflow->df;
unsigned int bb_index;
bitmap_iterator bi;
unsigned int regno;
- struct df_ru_problem_data *problem_data
- = (struct df_ru_problem_data *) dflow->problem_data;
- bitmap sparse_invalidated = problem_data->sparse_invalidated_by_call;
- bitmap dense_invalidated = problem_data->dense_invalidated_by_call;
+ struct df_rd_problem_data *problem_data
+ = (struct df_rd_problem_data *) df_rd->problem_data;
+ bitmap sparse_invalidated = &problem_data->sparse_invalidated_by_call;
+ bitmap dense_invalidated = &problem_data->dense_invalidated_by_call;
+
+ bitmap_initialize (&seen_in_block, &df_bitmap_obstack);
+ bitmap_initialize (&seen_in_insn, &df_bitmap_obstack);
- df_set_seen ();
- df_reorganize_refs (&df->use_info);
+ df_maybe_reorganize_def_refs (DF_REF_ORDER_BY_REG);
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- df_ru_bb_local_compute (dflow, bb_index);
+ df_rd_bb_local_compute (bb_index);
}
-
+
/* Set up the knockout bit vectors to be applied across EH_EDGES. */
- EXECUTE_IF_SET_IN_BITMAP (df_invalidated_by_call, 0, regno, bi)
+ EXECUTE_IF_SET_IN_BITMAP (regs_invalidated_by_call_regset, 0, regno, bi)
{
- struct df_reg_info *reg_info = DF_REG_USE_GET (df, regno);
- if (reg_info->n_refs > DF_SPARSE_THRESHOLD)
+ if (DF_DEFS_COUNT (regno) > DF_SPARSE_THRESHOLD)
bitmap_set_bit (sparse_invalidated, regno);
else
- {
- bitmap defs = df_ref_bitmap (problem_data->use_sites, regno,
- reg_info->begin, reg_info->n_refs);
- bitmap_ior_into (dense_invalidated, defs);
- }
+ bitmap_set_range (dense_invalidated,
+ DF_DEFS_BEGIN (regno),
+ DF_DEFS_COUNT (regno));
}
- df_unset_seen ();
+ bitmap_clear (&seen_in_block);
+ bitmap_clear (&seen_in_insn);
}
/* Initialize the solution bit vectors for problem. */
-static void
-df_ru_init_solution (struct dataflow *dflow, bitmap all_blocks)
+static void
+df_rd_init_solution (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- struct df_ru_bb_info *bb_info = df_ru_get_bb_info (dflow, bb_index);
- bitmap_copy (bb_info->in, bb_info->gen);
- bitmap_clear (bb_info->out);
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb_index);
+
+ bitmap_copy (&bb_info->out, &bb_info->gen);
+ bitmap_clear (&bb_info->in);
}
}
+/* In of target gets or of out of source. */
-/* Out of target gets or of in of source. */
-
-static void
-df_ru_confluence_n (struct dataflow *dflow, edge e)
+static bool
+df_rd_confluence_n (edge e)
{
- bitmap op1 = df_ru_get_bb_info (dflow, e->src->index)->out;
- bitmap op2 = df_ru_get_bb_info (dflow, e->dest->index)->in;
+ bitmap op1 = &df_rd_get_bb_info (e->dest->index)->in;
+ bitmap op2 = &df_rd_get_bb_info (e->src->index)->out;
+ bool changed = false;
+
+ if (e->flags & EDGE_FAKE)
+ return false;
if (e->flags & EDGE_EH)
{
- struct df_ru_problem_data *problem_data
- = (struct df_ru_problem_data *) dflow->problem_data;
- bitmap sparse_invalidated = problem_data->sparse_invalidated_by_call;
- bitmap dense_invalidated = problem_data->dense_invalidated_by_call;
- struct df *df = dflow->df;
+ struct df_rd_problem_data *problem_data
+ = (struct df_rd_problem_data *) df_rd->problem_data;
+ bitmap sparse_invalidated = &problem_data->sparse_invalidated_by_call;
+ bitmap dense_invalidated = &problem_data->dense_invalidated_by_call;
bitmap_iterator bi;
unsigned int regno;
- bitmap tmp = BITMAP_ALLOC (NULL);
+ bitmap_head tmp;
- bitmap_copy (tmp, op2);
- bitmap_and_compl_into (tmp, dense_invalidated);
+ bitmap_initialize (&tmp, &df_bitmap_obstack);
+ bitmap_copy (&tmp, op2);
+ bitmap_and_compl_into (&tmp, dense_invalidated);
EXECUTE_IF_SET_IN_BITMAP (sparse_invalidated, 0, regno, bi)
- {
- bitmap_clear_range (tmp,
- DF_REG_USE_GET (df, regno)->begin,
- DF_REG_USE_GET (df, regno)->n_refs);
+ {
+ bitmap_clear_range (&tmp,
+ DF_DEFS_BEGIN (regno),
+ DF_DEFS_COUNT (regno));
}
- bitmap_ior_into (op1, tmp);
- BITMAP_FREE (tmp);
+ changed |= bitmap_ior_into (op1, &tmp);
+ bitmap_clear (&tmp);
+ return changed;
}
else
- bitmap_ior_into (op1, op2);
+ return bitmap_ior_into (op1, op2);
}
/* Transfer function. */
static bool
-df_ru_transfer_function (struct dataflow *dflow, int bb_index)
+df_rd_transfer_function (int bb_index)
{
- struct df_ru_bb_info *bb_info = df_ru_get_bb_info (dflow, bb_index);
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb_index);
unsigned int regno;
bitmap_iterator bi;
- bitmap in = bb_info->in;
- bitmap out = bb_info->out;
- bitmap gen = bb_info->gen;
- bitmap kill = bb_info->kill;
- bitmap sparse_kill = bb_info->sparse_kill;
+ bitmap in = &bb_info->in;
+ bitmap out = &bb_info->out;
+ bitmap gen = &bb_info->gen;
+ bitmap kill = &bb_info->kill;
+ bitmap sparse_kill = &bb_info->sparse_kill;
if (bitmap_empty_p (sparse_kill))
- return bitmap_ior_and_compl (in, gen, out, kill);
- else
+ return bitmap_ior_and_compl (out, gen, in, kill);
+ else
{
- struct df *df = dflow->df;
+ struct df_rd_problem_data *problem_data;
bool changed = false;
- bitmap tmp = BITMAP_ALLOC (NULL);
- bitmap_copy (tmp, out);
+ bitmap_head tmp;
+
+ /* Note that TMP is _not_ a temporary bitmap if we end up replacing
+ OUT with TMP. Therefore, allocate TMP in the RD bitmaps obstack. */
+ problem_data = (struct df_rd_problem_data *) df_rd->problem_data;
+ bitmap_initialize (&tmp, &problem_data->rd_bitmaps);
+
+ bitmap_copy (&tmp, in);
EXECUTE_IF_SET_IN_BITMAP (sparse_kill, 0, regno, bi)
{
- bitmap_clear_range (tmp,
- DF_REG_USE_GET (df, regno)->begin,
- DF_REG_USE_GET (df, regno)->n_refs);
+ bitmap_clear_range (&tmp,
+ DF_DEFS_BEGIN (regno),
+ DF_DEFS_COUNT (regno));
}
- bitmap_and_compl_into (tmp, kill);
- bitmap_ior_into (tmp, gen);
- changed = !bitmap_equal_p (tmp, in);
+ bitmap_and_compl_into (&tmp, kill);
+ bitmap_ior_into (&tmp, gen);
+ changed = !bitmap_equal_p (&tmp, out);
if (changed)
{
- BITMAP_FREE (in);
- bb_info->in = tmp;
+ bitmap_clear (out);
+ bb_info->out = tmp;
}
- else
- BITMAP_FREE (tmp);
+ else
+ bitmap_clear (&tmp);
return changed;
}
}
/* Free all storage associated with the problem. */
static void
-df_ru_free (struct dataflow *dflow)
+df_rd_free (void)
{
- unsigned int i;
- struct df_ru_problem_data *problem_data
- = (struct df_ru_problem_data *) dflow->problem_data;
+ struct df_rd_problem_data *problem_data
+ = (struct df_rd_problem_data *) df_rd->problem_data;
if (problem_data)
{
- for (i = 0; i < dflow->block_info_size; i++)
- {
- struct df_ru_bb_info *bb_info = df_ru_get_bb_info (dflow, i);
- if (bb_info)
- {
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->sparse_kill);
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- }
- }
-
- free_alloc_pool (dflow->block_pool);
-
- for (i = 0; i < problem_data->use_sites_size; i++)
- {
- bitmap bm = problem_data->use_sites[i];
- if (bm)
- BITMAP_FREE (bm);
- }
-
- free (problem_data->use_sites);
- BITMAP_FREE (problem_data->sparse_invalidated_by_call);
- BITMAP_FREE (problem_data->dense_invalidated_by_call);
-
- dflow->block_info_size = 0;
- free (dflow->block_info);
- free (dflow->problem_data);
+ bitmap_obstack_release (&problem_data->rd_bitmaps);
+
+ df_rd->block_info_size = 0;
+ free (df_rd->block_info);
+ df_rd->block_info = NULL;
+ free (df_rd->problem_data);
}
- free (dflow);
+ free (df_rd);
}
/* Debugging info. */
static void
-df_ru_dump (struct dataflow *dflow, FILE *file)
+df_rd_start_dump (FILE *file)
{
- basic_block bb;
- struct df *df = dflow->df;
- struct df_ru_problem_data *problem_data
- = (struct df_ru_problem_data *) dflow->problem_data;
- unsigned int m = max_reg_num ();
+ struct df_rd_problem_data *problem_data
+ = (struct df_rd_problem_data *) df_rd->problem_data;
+ unsigned int m = DF_REG_SIZE(df);
unsigned int regno;
-
- if (!dflow->block_info)
+
+ if (!df_rd->block_info)
return;
- fprintf (file, "Reaching uses:\n");
+ fprintf (file, ";; Reaching defs:\n\n");
fprintf (file, " sparse invalidated \t");
- dump_bitmap (file, problem_data->sparse_invalidated_by_call);
+ dump_bitmap (file, &problem_data->sparse_invalidated_by_call);
fprintf (file, " dense invalidated \t");
- dump_bitmap (file, problem_data->dense_invalidated_by_call);
-
+ dump_bitmap (file, &problem_data->dense_invalidated_by_call);
+
for (regno = 0; regno < m; regno++)
- if (DF_REG_USE_GET (df, regno)->n_refs)
- fprintf (file, "%d[%d,%d] ", regno,
- DF_REG_USE_GET (df, regno)->begin,
- DF_REG_USE_GET (df, regno)->n_refs);
+ if (DF_DEFS_COUNT (regno))
+ fprintf (file, "%d[%d,%d] ", regno,
+ DF_DEFS_BEGIN (regno),
+ DF_DEFS_COUNT (regno));
fprintf (file, "\n");
- FOR_ALL_BB (bb)
- {
- struct df_ru_bb_info *bb_info = df_ru_get_bb_info (dflow, bb->index);
- df_print_bb_index (bb, file);
-
- if (!bb_info->in)
- continue;
-
- fprintf (file, " in \t(%d)\n", (int) bitmap_count_bits (bb_info->in));
- dump_bitmap (file, bb_info->in);
- fprintf (file, " gen \t(%d)\n", (int) bitmap_count_bits (bb_info->gen));
- dump_bitmap (file, bb_info->gen);
- fprintf (file, " kill\t(%d)\n", (int) bitmap_count_bits (bb_info->kill));
- dump_bitmap (file, bb_info->kill);
- fprintf (file, " out \t(%d)\n", (int) bitmap_count_bits (bb_info->out));
- dump_bitmap (file, bb_info->out);
- }
+}
+
+
+/* Debugging info at top of bb. */
+
+static void
+df_rd_top_dump (basic_block bb, FILE *file)
+{
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb->index);
+ if (!bb_info)
+ return;
+
+ fprintf (file, ";; rd in \t(%d)\n", (int) bitmap_count_bits (&bb_info->in));
+ dump_bitmap (file, &bb_info->in);
+ fprintf (file, ";; rd gen \t(%d)\n", (int) bitmap_count_bits (&bb_info->gen));
+ dump_bitmap (file, &bb_info->gen);
+ fprintf (file, ";; rd kill\t(%d)\n", (int) bitmap_count_bits (&bb_info->kill));
+ dump_bitmap (file, &bb_info->kill);
+}
+
+
+/* Debugging info at top of bb. */
+
+static void
+df_rd_bottom_dump (basic_block bb, FILE *file)
+{
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb->index);
+ if (!bb_info)
+ return;
+
+ fprintf (file, ";; rd out \t(%d)\n", (int) bitmap_count_bits (&bb_info->out));
+ dump_bitmap (file, &bb_info->out);
}
/* All of the information associated with every instance of the problem. */
-static struct df_problem problem_RU =
+static struct df_problem problem_RD =
{
- DF_RU, /* Problem id. */
- DF_BACKWARD, /* Direction. */
- df_ru_alloc, /* Allocate the problem specific data. */
+ DF_RD, /* Problem id. */
+ DF_FORWARD, /* Direction. */
+ df_rd_alloc, /* Allocate the problem specific data. */
NULL, /* Reset global information. */
- df_ru_free_bb_info, /* Free basic block info. */
- df_ru_local_compute, /* Local compute function. */
- df_ru_init_solution, /* Init the solution specific data. */
- df_iterative_dataflow, /* Iterative solver. */
- NULL, /* Confluence operator 0. */
- df_ru_confluence_n, /* Confluence operator n. */
- df_ru_transfer_function, /* Transfer function. */
+ df_rd_free_bb_info, /* Free basic block info. */
+ df_rd_local_compute, /* Local compute function. */
+ df_rd_init_solution, /* Init the solution specific data. */
+ df_worklist_dataflow, /* Worklist solver. */
+ NULL, /* Confluence operator 0. */
+ df_rd_confluence_n, /* Confluence operator n. */
+ df_rd_transfer_function, /* Transfer function. */
NULL, /* Finalize function. */
- df_ru_free, /* Free all of the problem information. */
- df_ru_dump, /* Debugging. */
+ df_rd_free, /* Free all of the problem information. */
+ df_rd_free, /* Remove this problem from the stack of dataflow problems. */
+ df_rd_start_dump, /* Debugging. */
+ df_rd_top_dump, /* Debugging start block. */
+ df_rd_bottom_dump, /* Debugging end block. */
+ NULL, /* Incremental solution verify start. */
+ NULL, /* Incremental solution verify end. */
NULL, /* Dependent problem. */
- 0 /* Changeable flags. */
+ sizeof (struct df_rd_bb_info),/* Size of entry of block_info array. */
+ TV_DF_RD, /* Timing variable. */
+ true /* Reset blocks on dropping out of blocks_to_analyze. */
};
-/* Create a new DATAFLOW instance and add it to an existing instance
- of DF. The returned structure is what is used to get at the
- solution. */
+/* Create a new RD instance and add it to the existing instance
+ of DF. */
-struct dataflow *
-df_ru_add_problem (struct df *df, int flags)
+void
+df_rd_add_problem (void)
{
- return df_add_problem (df, &problem_RU, flags);
+ df_add_problem (&problem_RD);
}
+
\f
/*----------------------------------------------------------------------------
- REACHING DEFINITIONS
+ LIVE REGISTERS
- Find the locations in the function where each definition site for a
- pseudo reaches. In and out bitvectors are built for each basic
- block. The id field in the ref is used to index into these sets.
+ Find the locations in the function where any use of a pseudo can
+ reach in the backwards direction. In and out bitvectors are built
+ for each basic block. The regno is used to index into these sets.
See df.h for details.
----------------------------------------------------------------------------*/
-/* See the comment at the top of the Reaching Uses problem for how the
- uses are represented in the kill sets. The same games are played
- here for the defs. */
-
-/* Private data used to compute the solution for this problem. These
- data structures are not accessible outside of this module. */
-struct df_rd_problem_data
+/* Private data used to verify the solution for this problem. */
+struct df_lr_problem_data
{
- /* If the number of defs for regnum N is less than
- DF_SPARSE_THRESHOLD, uses_sites[N] contains a mask of the all of
- the defs of reg N indexed by the id in the ref structure. If
- there are more than DF_SPARSE_THRESHOLD defs for regnum N a
- different mechanism is used to mask the def. */
- bitmap *def_sites; /* Bitmap of defs for each pseudo. */
- unsigned int def_sites_size; /* Size of def_sites. */
- /* The set of defs to regs invalidated by call. */
- bitmap sparse_invalidated_by_call;
- /* The set of defs to regs invalidate by call for rd. */
- bitmap dense_invalidated_by_call;
+ bitmap_head *in;
+ bitmap_head *out;
+ /* An obstack for the bitmaps we need for this problem. */
+ bitmap_obstack lr_bitmaps;
};
-/* Get basic block info. */
-
-struct df_rd_bb_info *
-df_rd_get_bb_info (struct dataflow *dflow, unsigned int index)
-{
- return (struct df_rd_bb_info *) dflow->block_info[index];
-}
-
-
-/* Set basic block info. */
-
-static void
-df_rd_set_bb_info (struct dataflow *dflow, unsigned int index,
- struct df_rd_bb_info *bb_info)
-{
- dflow->block_info[index] = bb_info;
-}
-
-
/* Free basic block info. */
static void
-df_rd_free_bb_info (struct dataflow *dflow,
- basic_block bb ATTRIBUTE_UNUSED,
+df_lr_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
void *vbb_info)
{
- struct df_rd_bb_info *bb_info = (struct df_rd_bb_info *) vbb_info;
+ struct df_lr_bb_info *bb_info = (struct df_lr_bb_info *) vbb_info;
if (bb_info)
{
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->sparse_kill);
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- pool_free (dflow->block_pool, bb_info);
+ bitmap_clear (&bb_info->use);
+ bitmap_clear (&bb_info->def);
+ bitmap_clear (&bb_info->in);
+ bitmap_clear (&bb_info->out);
}
}
-/* Allocate or reset bitmaps for DFLOW blocks. The solution bits are
+/* Allocate or reset bitmaps for DF_LR blocks. The solution bits are
not touched unless the block is new. */
-static void
-df_rd_alloc (struct dataflow *dflow,
- bitmap blocks_to_rescan ATTRIBUTE_UNUSED,
- bitmap all_blocks)
+static void
+df_lr_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
unsigned int bb_index;
bitmap_iterator bi;
- unsigned int reg_size = max_reg_num ();
-
- if (!dflow->block_pool)
- dflow->block_pool = create_alloc_pool ("df_rd_block pool",
- sizeof (struct df_rd_bb_info), 50);
+ struct df_lr_problem_data *problem_data;
- if (dflow->problem_data)
- {
- unsigned int i;
- struct df_rd_problem_data *problem_data
- = (struct df_rd_problem_data *) dflow->problem_data;
-
- for (i = 0; i < problem_data->def_sites_size; i++)
- {
- bitmap bm = problem_data->def_sites[i];
- if (bm)
- {
- BITMAP_FREE (bm);
- problem_data->def_sites[i] = NULL;
- }
- }
-
- if (problem_data->def_sites_size < reg_size)
- {
- problem_data->def_sites
- = xrealloc (problem_data->def_sites, reg_size *sizeof (bitmap));
- memset (problem_data->def_sites + problem_data->def_sites_size, 0,
- (reg_size - problem_data->def_sites_size) *sizeof (bitmap));
- problem_data->def_sites_size = reg_size;
- }
-
- bitmap_clear (problem_data->sparse_invalidated_by_call);
- bitmap_clear (problem_data->dense_invalidated_by_call);
- }
- else
+ df_grow_bb_info (df_lr);
+ if (df_lr->problem_data)
+ problem_data = (struct df_lr_problem_data *) df_lr->problem_data;
+ else
{
- struct df_rd_problem_data *problem_data = XNEW (struct df_rd_problem_data);
- dflow->problem_data = problem_data;
+ problem_data = XNEW (struct df_lr_problem_data);
+ df_lr->problem_data = problem_data;
- problem_data->def_sites = XCNEWVEC (bitmap, reg_size);
- problem_data->def_sites_size = reg_size;
- problem_data->sparse_invalidated_by_call = BITMAP_ALLOC (NULL);
- problem_data->dense_invalidated_by_call = BITMAP_ALLOC (NULL);
+ problem_data->out = NULL;
+ problem_data->in = NULL;
+ bitmap_obstack_initialize (&problem_data->lr_bitmaps);
}
- df_grow_bb_info (dflow);
-
- /* Because of the clustering of all use sites for the same pseudo,
- we have to process all of the blocks before doing the
- analysis. */
-
- EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ EXECUTE_IF_SET_IN_BITMAP (df_lr->out_of_date_transfer_functions, 0, bb_index, bi)
{
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (dflow, bb_index);
- if (bb_info)
- {
- bitmap_clear (bb_info->kill);
- bitmap_clear (bb_info->sparse_kill);
- bitmap_clear (bb_info->gen);
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb_index);
+
+ /* When bitmaps are already initialized, just clear them. */
+ if (bb_info->use.obstack)
+ {
+ bitmap_clear (&bb_info->def);
+ bitmap_clear (&bb_info->use);
}
else
- {
- bb_info = (struct df_rd_bb_info *) pool_alloc (dflow->block_pool);
- df_rd_set_bb_info (dflow, bb_index, bb_info);
- bb_info->kill = BITMAP_ALLOC (NULL);
- bb_info->sparse_kill = BITMAP_ALLOC (NULL);
- bb_info->gen = BITMAP_ALLOC (NULL);
- bb_info->in = BITMAP_ALLOC (NULL);
- bb_info->out = BITMAP_ALLOC (NULL);
+ {
+ bitmap_initialize (&bb_info->use, &problem_data->lr_bitmaps);
+ bitmap_initialize (&bb_info->def, &problem_data->lr_bitmaps);
+ bitmap_initialize (&bb_info->in, &problem_data->lr_bitmaps);
+ bitmap_initialize (&bb_info->out, &problem_data->lr_bitmaps);
}
}
+
+ df_lr->optional_p = false;
}
-/* Process a list of DEFs for df_rd_bb_local_compute. */
+/* Reset the global solution for recalculation. */
static void
-df_rd_bb_local_compute_process_def (struct dataflow *dflow,
- struct df_rd_bb_info *bb_info,
- struct df_ref *def,
- enum df_ref_flags top_flag)
+df_lr_reset (bitmap all_blocks)
{
- struct df *df = dflow->df;
- while (def)
+ unsigned int bb_index;
+ bitmap_iterator bi;
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- if (top_flag == (DF_REF_FLAGS (def) & DF_REF_AT_TOP))
- {
- unsigned int regno = DF_REF_REGNO (def);
- unsigned int begin = DF_REG_DEF_GET (df, regno)->begin;
- unsigned int n_defs = DF_REG_DEF_GET (df, regno)->n_refs;
-
- /* Only the last def(s) for a regno in the block has any
- effect. */
- if (!bitmap_bit_p (seen_in_block, regno))
- {
- /* The first def for regno in insn gets to knock out the
- defs from other instructions. */
- if ((!bitmap_bit_p (seen_in_insn, regno))
- /* If the def is to only part of the reg, it does
- not kill the other defs that reach here. */
- && (!((DF_REF_FLAGS (def) & DF_REF_PARTIAL)
- || (DF_REF_FLAGS (def) & DF_REF_MAY_CLOBBER))))
- {
- if (n_defs > DF_SPARSE_THRESHOLD)
- {
- bitmap_set_bit (bb_info->sparse_kill, regno);
- bitmap_clear_range(bb_info->gen, begin, n_defs);
- }
- else
- {
- struct df_rd_problem_data * problem_data
- = (struct df_rd_problem_data *)dflow->problem_data;
- bitmap defs = df_ref_bitmap (problem_data->def_sites,
- regno, begin, n_defs);
- bitmap_ior_into (bb_info->kill, defs);
- bitmap_and_compl_into (bb_info->gen, defs);
- }
- }
-
- bitmap_set_bit (seen_in_insn, regno);
- /* All defs for regno in the instruction may be put into
- the gen set. */
- if (!(DF_REF_FLAGS (def)
- & (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER)))
- bitmap_set_bit (bb_info->gen, DF_REF_ID (def));
- }
- }
- def = def->next_ref;
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb_index);
+ gcc_assert (bb_info);
+ bitmap_clear (&bb_info->in);
+ bitmap_clear (&bb_info->out);
}
}
-/* Compute local reaching def info for basic block BB. */
+
+/* Compute local live register info for basic block BB. */
static void
-df_rd_bb_local_compute (struct dataflow *dflow, unsigned int bb_index)
+df_lr_bb_local_compute (unsigned int bb_index)
{
- struct df *df = dflow->df;
basic_block bb = BASIC_BLOCK (bb_index);
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (dflow, bb_index);
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb_index);
rtx insn;
+ df_ref *def_rec;
+ df_ref *use_rec;
- bitmap_clear (seen_in_block);
- bitmap_clear (seen_in_insn);
+ /* Process the registers set in an exception handler. */
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ bitmap_set_bit (&bb_info->def, dregno);
+ bitmap_clear_bit (&bb_info->use, dregno);
+ }
+ }
- df_rd_bb_local_compute_process_def (dflow, bb_info,
- df_get_artificial_defs (df, bb_index), 0);
+ /* Process the hardware registers that are always live. */
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ df_ref use = *use_rec;
+ /* Add use to set of uses in this BB. */
+ if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
+ bitmap_set_bit (&bb_info->use, DF_REF_REGNO (use));
+ }
FOR_BB_INSNS_REVERSE (bb, insn)
{
unsigned int uid = INSN_UID (insn);
- if (!INSN_P (insn))
+ if (!NONDEBUG_INSN_P (insn))
continue;
- df_rd_bb_local_compute_process_def (dflow, bb_info,
- DF_INSN_UID_DEFS (df, uid), 0);
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ /* If the def is to only part of the reg, it does
+ not kill the other defs that reach here. */
+ if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL)))
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ bitmap_set_bit (&bb_info->def, dregno);
+ bitmap_clear_bit (&bb_info->use, dregno);
+ }
+ }
- /* This complex dance with the two bitmaps is required because
- instructions can assign twice to the same pseudo. This
- generally happens with calls that will have one def for the
- result and another def for the clobber. If only one vector
- is used and the clobber goes first, the result will be
- lost. */
- bitmap_ior_into (seen_in_block, seen_in_insn);
- bitmap_clear (seen_in_insn);
+ for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
+ {
+ df_ref use = *use_rec;
+ /* Add use to set of uses in this BB. */
+ bitmap_set_bit (&bb_info->use, DF_REF_REGNO (use));
+ }
}
- /* Process the artificial defs at the top of the block last since we
- are going backwards through the block and these are logically at
- the start. */
- df_rd_bb_local_compute_process_def (dflow, bb_info,
- df_get_artificial_defs (df, bb_index),
- DF_REF_AT_TOP);
+ /* Process the registers set in an exception handler or the hard
+ frame pointer if this block is the target of a non local
+ goto. */
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ bitmap_set_bit (&bb_info->def, dregno);
+ bitmap_clear_bit (&bb_info->use, dregno);
+ }
+ }
+
+#ifdef EH_USES
+ /* Process the uses that are live into an exception handler. */
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ df_ref use = *use_rec;
+ /* Add use to set of uses in this BB. */
+ if (DF_REF_FLAGS (use) & DF_REF_AT_TOP)
+ bitmap_set_bit (&bb_info->use, DF_REF_REGNO (use));
+ }
+#endif
+
+ /* If the df_live problem is not defined, such as at -O0 and -O1, we
+ still need to keep the luids up to date. This is normally done
+ in the df_live problem since this problem has a forwards
+ scan. */
+ if (!df_live)
+ df_recompute_luids (bb);
}
-/* Compute local reaching def info for each basic block within BLOCKS. */
+/* Compute local live register info for each basic block within BLOCKS. */
static void
-df_rd_local_compute (struct dataflow *dflow,
- bitmap all_blocks,
- bitmap rescan_blocks ATTRIBUTE_UNUSED)
+df_lr_local_compute (bitmap all_blocks ATTRIBUTE_UNUSED)
{
- struct df *df = dflow->df;
unsigned int bb_index;
bitmap_iterator bi;
- unsigned int regno;
- struct df_rd_problem_data *problem_data
- = (struct df_rd_problem_data *) dflow->problem_data;
- bitmap sparse_invalidated = problem_data->sparse_invalidated_by_call;
- bitmap dense_invalidated = problem_data->dense_invalidated_by_call;
- df_set_seen ();
- df_reorganize_refs (&df->def_info);
+ bitmap_clear (&df->hardware_regs_used);
- EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ /* The all-important stack pointer must always be live. */
+ bitmap_set_bit (&df->hardware_regs_used, STACK_POINTER_REGNUM);
+
+ /* Before reload, there are a few registers that must be forced
+ live everywhere -- which might not already be the case for
+ blocks within infinite loops. */
+ if (!reload_completed)
{
- df_rd_bb_local_compute (dflow, bb_index);
+ unsigned int pic_offset_table_regnum = PIC_OFFSET_TABLE_REGNUM;
+ /* Any reference to any pseudo before reload is a potential
+ reference of the frame pointer. */
+ bitmap_set_bit (&df->hardware_regs_used, FRAME_POINTER_REGNUM);
+
+#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
+ /* Pseudos with argument area equivalences may require
+ reloading via the argument pointer. */
+ if (fixed_regs[ARG_POINTER_REGNUM])
+ bitmap_set_bit (&df->hardware_regs_used, ARG_POINTER_REGNUM);
+#endif
+
+ /* Any constant, or pseudo with constant equivalences, may
+ require reloading from memory using the pic register. */
+ if (pic_offset_table_regnum != INVALID_REGNUM
+ && fixed_regs[pic_offset_table_regnum])
+ bitmap_set_bit (&df->hardware_regs_used, pic_offset_table_regnum);
}
-
- /* Set up the knockout bit vectors to be applied across EH_EDGES. */
- EXECUTE_IF_SET_IN_BITMAP (df_invalidated_by_call, 0, regno, bi)
+
+ EXECUTE_IF_SET_IN_BITMAP (df_lr->out_of_date_transfer_functions, 0, bb_index, bi)
{
- struct df_reg_info *reg_info = DF_REG_DEF_GET (df, regno);
- if (reg_info->n_refs > DF_SPARSE_THRESHOLD)
+ if (bb_index == EXIT_BLOCK)
{
- bitmap_set_bit (sparse_invalidated, regno);
+ /* The exit block is special for this problem and its bits are
+ computed from thin air. */
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (EXIT_BLOCK);
+ bitmap_copy (&bb_info->use, df->exit_block_uses);
}
else
- {
- bitmap defs = df_ref_bitmap (problem_data->def_sites, regno,
- reg_info->begin, reg_info->n_refs);
- bitmap_ior_into (dense_invalidated, defs);
- }
+ df_lr_bb_local_compute (bb_index);
}
- df_unset_seen ();
+
+ bitmap_clear (df_lr->out_of_date_transfer_functions);
}
-/* Initialize the solution bit vectors for problem. */
+/* Initialize the solution vectors. */
-static void
-df_rd_init_solution (struct dataflow *dflow, bitmap all_blocks)
+static void
+df_lr_init (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (dflow, bb_index);
-
- bitmap_copy (bb_info->out, bb_info->gen);
- bitmap_clear (bb_info->in);
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb_index);
+ bitmap_copy (&bb_info->in, &bb_info->use);
+ bitmap_clear (&bb_info->out);
}
}
-/* In of target gets or of out of source. */
+/* Confluence function that processes infinite loops. This might be a
+ noreturn function that throws. And even if it isn't, getting the
+ unwind info right helps debugging. */
static void
-df_rd_confluence_n (struct dataflow *dflow, edge e)
+df_lr_confluence_0 (basic_block bb)
{
- bitmap op1 = df_rd_get_bb_info (dflow, e->dest->index)->in;
- bitmap op2 = df_rd_get_bb_info (dflow, e->src->index)->out;
+ bitmap op1 = &df_lr_get_bb_info (bb->index)->out;
+ if (bb != EXIT_BLOCK_PTR)
+ bitmap_copy (op1, &df->hardware_regs_used);
+}
- if (e->flags & EDGE_EH)
- {
- struct df_rd_problem_data *problem_data
- = (struct df_rd_problem_data *) dflow->problem_data;
- bitmap sparse_invalidated = problem_data->sparse_invalidated_by_call;
- bitmap dense_invalidated = problem_data->dense_invalidated_by_call;
- struct df *df = dflow->df;
- bitmap_iterator bi;
- unsigned int regno;
- bitmap tmp = BITMAP_ALLOC (NULL);
- bitmap_copy (tmp, op2);
- bitmap_and_compl_into (tmp, dense_invalidated);
+/* Confluence function that ignores fake edges. */
- EXECUTE_IF_SET_IN_BITMAP (sparse_invalidated, 0, regno, bi)
- {
- bitmap_clear_range (tmp,
- DF_REG_DEF_GET (df, regno)->begin,
- DF_REG_DEF_GET (df, regno)->n_refs);
- }
- bitmap_ior_into (op1, tmp);
- BITMAP_FREE (tmp);
- }
+static bool
+df_lr_confluence_n (edge e)
+{
+ bitmap op1 = &df_lr_get_bb_info (e->src->index)->out;
+ bitmap op2 = &df_lr_get_bb_info (e->dest->index)->in;
+ bool changed = false;
+
+ /* Call-clobbered registers die across exception and call edges. */
+ /* ??? Abnormal call edges ignored for the moment, as this gets
+ confused by sibling call edges, which crashes reg-stack. */
+ if (e->flags & EDGE_EH)
+ changed = bitmap_ior_and_compl_into (op1, op2, regs_invalidated_by_call_regset);
else
- bitmap_ior_into (op1, op2);
+ changed = bitmap_ior_into (op1, op2);
+
+ changed |= bitmap_ior_into (op1, &df->hardware_regs_used);
+ return changed;
}
/* Transfer function. */
static bool
-df_rd_transfer_function (struct dataflow *dflow, int bb_index)
+df_lr_transfer_function (int bb_index)
{
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (dflow, bb_index);
- unsigned int regno;
- bitmap_iterator bi;
- bitmap in = bb_info->in;
- bitmap out = bb_info->out;
- bitmap gen = bb_info->gen;
- bitmap kill = bb_info->kill;
- bitmap sparse_kill = bb_info->sparse_kill;
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb_index);
+ bitmap in = &bb_info->in;
+ bitmap out = &bb_info->out;
+ bitmap use = &bb_info->use;
+ bitmap def = &bb_info->def;
- if (bitmap_empty_p (sparse_kill))
- return bitmap_ior_and_compl (out, gen, in, kill);
- else
+ return bitmap_ior_and_compl (in, use, out, def);
+}
+
+
+/* Run the fast dce as a side effect of building LR. */
+
+static void
+df_lr_finalize (bitmap all_blocks)
+{
+ df_lr->solutions_dirty = false;
+ if (df->changeable_flags & DF_LR_RUN_DCE)
{
- struct df *df = dflow->df;
- bool changed = false;
- bitmap tmp = BITMAP_ALLOC (NULL);
- bitmap_copy (tmp, in);
- EXECUTE_IF_SET_IN_BITMAP (sparse_kill, 0, regno, bi)
- {
- bitmap_clear_range (tmp,
- DF_REG_DEF_GET (df, regno)->begin,
- DF_REG_DEF_GET (df, regno)->n_refs);
- }
- bitmap_and_compl_into (tmp, kill);
- bitmap_ior_into (tmp, gen);
- changed = !bitmap_equal_p (tmp, out);
- if (changed)
+ run_fast_df_dce ();
+
+ /* If dce deletes some instructions, we need to recompute the lr
+ solution before proceeding further. The problem is that fast
+ dce is a pessimestic dataflow algorithm. In the case where
+ it deletes a statement S inside of a loop, the uses inside of
+ S may not be deleted from the dataflow solution because they
+ were carried around the loop. While it is conservatively
+ correct to leave these extra bits, the standards of df
+ require that we maintain the best possible (least fixed
+ point) solution. The only way to do that is to redo the
+ iteration from the beginning. See PR35805 for an
+ example. */
+ if (df_lr->solutions_dirty)
{
- BITMAP_FREE (out);
- bb_info->out = tmp;
+ df_clear_flags (DF_LR_RUN_DCE);
+ df_lr_alloc (all_blocks);
+ df_lr_local_compute (all_blocks);
+ df_worklist_dataflow (df_lr, all_blocks, df->postorder, df->n_blocks);
+ df_lr_finalize (all_blocks);
+ df_set_flags (DF_LR_RUN_DCE);
}
- else
- BITMAP_FREE (tmp);
- return changed;
}
}
/* Free all storage associated with the problem. */
static void
-df_rd_free (struct dataflow *dflow)
+df_lr_free (void)
{
- unsigned int i;
- struct df_rd_problem_data *problem_data
- = (struct df_rd_problem_data *) dflow->problem_data;
+ struct df_lr_problem_data *problem_data
+ = (struct df_lr_problem_data *) df_lr->problem_data;
+ if (df_lr->block_info)
+ {
- if (problem_data)
+ df_lr->block_info_size = 0;
+ free (df_lr->block_info);
+ df_lr->block_info = NULL;
+ bitmap_obstack_release (&problem_data->lr_bitmaps);
+ free (df_lr->problem_data);
+ df_lr->problem_data = NULL;
+ }
+
+ BITMAP_FREE (df_lr->out_of_date_transfer_functions);
+ free (df_lr);
+}
+
+
+/* Debugging info at top of bb. */
+
+static void
+df_lr_top_dump (basic_block bb, FILE *file)
+{
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb->index);
+ struct df_lr_problem_data *problem_data;
+ if (!bb_info)
+ return;
+
+ fprintf (file, ";; lr in \t");
+ df_print_regset (file, &bb_info->in);
+ if (df_lr->problem_data)
{
- for (i = 0; i < dflow->block_info_size; i++)
+ problem_data = (struct df_lr_problem_data *)df_lr->problem_data;
+ if (problem_data->in)
{
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (dflow, i);
- if (bb_info)
- {
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->sparse_kill);
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- }
+ fprintf (file, ";; old in \t");
+ df_print_regset (file, &problem_data->in[bb->index]);
}
-
- free_alloc_pool (dflow->block_pool);
-
- for (i = 0; i < problem_data->def_sites_size; i++)
+ }
+ fprintf (file, ";; lr use \t");
+ df_print_regset (file, &bb_info->use);
+ fprintf (file, ";; lr def \t");
+ df_print_regset (file, &bb_info->def);
+}
+
+
+/* Debugging info at bottom of bb. */
+
+static void
+df_lr_bottom_dump (basic_block bb, FILE *file)
+{
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb->index);
+ struct df_lr_problem_data *problem_data;
+ if (!bb_info)
+ return;
+
+ fprintf (file, ";; lr out \t");
+ df_print_regset (file, &bb_info->out);
+ if (df_lr->problem_data)
+ {
+ problem_data = (struct df_lr_problem_data *)df_lr->problem_data;
+ if (problem_data->out)
{
- bitmap bm = problem_data->def_sites[i];
- if (bm)
- BITMAP_FREE (bm);
+ fprintf (file, ";; old out \t");
+ df_print_regset (file, &problem_data->out[bb->index]);
}
-
- free (problem_data->def_sites);
- BITMAP_FREE (problem_data->sparse_invalidated_by_call);
- BITMAP_FREE (problem_data->dense_invalidated_by_call);
-
- dflow->block_info_size = 0;
- free (dflow->block_info);
- free (dflow->problem_data);
}
- free (dflow);
}
-/* Debugging info. */
+/* Build the datastructure to verify that the solution to the dataflow
+ equations is not dirty. */
static void
-df_rd_dump (struct dataflow *dflow, FILE *file)
+df_lr_verify_solution_start (void)
{
- struct df *df = dflow->df;
basic_block bb;
- struct df_rd_problem_data *problem_data
- = (struct df_rd_problem_data *) dflow->problem_data;
- unsigned int m = max_reg_num ();
- unsigned int regno;
-
- if (!dflow->block_info)
+ struct df_lr_problem_data *problem_data;
+ if (df_lr->solutions_dirty)
return;
- fprintf (file, "Reaching defs:\n\n");
+ /* Set it true so that the solution is recomputed. */
+ df_lr->solutions_dirty = true;
- fprintf (file, " sparse invalidated \t");
- dump_bitmap (file, problem_data->sparse_invalidated_by_call);
- fprintf (file, " dense invalidated \t");
- dump_bitmap (file, problem_data->dense_invalidated_by_call);
+ problem_data = (struct df_lr_problem_data *)df_lr->problem_data;
+ problem_data->in = XNEWVEC (bitmap_head, last_basic_block);
+ problem_data->out = XNEWVEC (bitmap_head, last_basic_block);
- for (regno = 0; regno < m; regno++)
- if (DF_REG_DEF_GET (df, regno)->n_refs)
- fprintf (file, "%d[%d,%d] ", regno,
- DF_REG_DEF_GET (df, regno)->begin,
- DF_REG_DEF_GET (df, regno)->n_refs);
- fprintf (file, "\n");
+ FOR_ALL_BB (bb)
+ {
+ bitmap_initialize (&problem_data->in[bb->index], &problem_data->lr_bitmaps);
+ bitmap_initialize (&problem_data->out[bb->index], &problem_data->lr_bitmaps);
+ bitmap_copy (&problem_data->in[bb->index], DF_LR_IN (bb));
+ bitmap_copy (&problem_data->out[bb->index], DF_LR_OUT (bb));
+ }
+}
+
+
+/* Compare the saved datastructure and the new solution to the dataflow
+ equations. */
+
+static void
+df_lr_verify_solution_end (void)
+{
+ struct df_lr_problem_data *problem_data;
+ basic_block bb;
+
+ problem_data = (struct df_lr_problem_data *)df_lr->problem_data;
+
+ if (!problem_data->out)
+ return;
+
+ if (df_lr->solutions_dirty)
+ /* Do not check if the solution is still dirty. See the comment
+ in df_lr_finalize for details. */
+ df_lr->solutions_dirty = false;
+ else
+ FOR_ALL_BB (bb)
+ {
+ if ((!bitmap_equal_p (&problem_data->in[bb->index], DF_LR_IN (bb)))
+ || (!bitmap_equal_p (&problem_data->out[bb->index], DF_LR_OUT (bb))))
+ {
+ /*df_dump (stderr);*/
+ gcc_unreachable ();
+ }
+ }
+ /* Cannot delete them immediately because you may want to dump them
+ if the comparison fails. */
FOR_ALL_BB (bb)
{
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (dflow, bb->index);
- df_print_bb_index (bb, file);
-
- if (!bb_info->in)
- continue;
-
- fprintf (file, " in \t(%d)\n", (int) bitmap_count_bits (bb_info->in));
- dump_bitmap (file, bb_info->in);
- fprintf (file, " gen \t(%d)\n", (int) bitmap_count_bits (bb_info->gen));
- dump_bitmap (file, bb_info->gen);
- fprintf (file, " kill\t(%d)\n", (int) bitmap_count_bits (bb_info->kill));
- dump_bitmap (file, bb_info->kill);
- fprintf (file, " out \t(%d)\n", (int) bitmap_count_bits (bb_info->out));
- dump_bitmap (file, bb_info->out);
+ bitmap_clear (&problem_data->in[bb->index]);
+ bitmap_clear (&problem_data->out[bb->index]);
}
+
+ free (problem_data->in);
+ free (problem_data->out);
+ problem_data->in = NULL;
+ problem_data->out = NULL;
}
+
/* All of the information associated with every instance of the problem. */
-static struct df_problem problem_RD =
+static struct df_problem problem_LR =
{
- DF_RD, /* Problem id. */
- DF_FORWARD, /* Direction. */
- df_rd_alloc, /* Allocate the problem specific data. */
- NULL, /* Reset global information. */
- df_rd_free_bb_info, /* Free basic block info. */
- df_rd_local_compute, /* Local compute function. */
- df_rd_init_solution, /* Init the solution specific data. */
- df_iterative_dataflow, /* Iterative solver. */
- NULL, /* Confluence operator 0. */
- df_rd_confluence_n, /* Confluence operator n. */
- df_rd_transfer_function, /* Transfer function. */
- NULL, /* Finalize function. */
- df_rd_free, /* Free all of the problem information. */
- df_rd_dump, /* Debugging. */
+ DF_LR, /* Problem id. */
+ DF_BACKWARD, /* Direction. */
+ df_lr_alloc, /* Allocate the problem specific data. */
+ df_lr_reset, /* Reset global information. */
+ df_lr_free_bb_info, /* Free basic block info. */
+ df_lr_local_compute, /* Local compute function. */
+ df_lr_init, /* Init the solution specific data. */
+ df_worklist_dataflow, /* Worklist solver. */
+ df_lr_confluence_0, /* Confluence operator 0. */
+ df_lr_confluence_n, /* Confluence operator n. */
+ df_lr_transfer_function, /* Transfer function. */
+ df_lr_finalize, /* Finalize function. */
+ df_lr_free, /* Free all of the problem information. */
+ NULL, /* Remove this problem from the stack of dataflow problems. */
+ NULL, /* Debugging. */
+ df_lr_top_dump, /* Debugging start block. */
+ df_lr_bottom_dump, /* Debugging end block. */
+ df_lr_verify_solution_start,/* Incremental solution verify start. */
+ df_lr_verify_solution_end, /* Incremental solution verify end. */
NULL, /* Dependent problem. */
- 0 /* Changeable flags. */
+ sizeof (struct df_lr_bb_info),/* Size of entry of block_info array. */
+ TV_DF_LR, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
};
-
/* Create a new DATAFLOW instance and add it to an existing instance
of DF. The returned structure is what is used to get at the
solution. */
-struct dataflow *
-df_rd_add_problem (struct df *df, int flags)
+void
+df_lr_add_problem (void)
{
- return df_add_problem (df, &problem_RD, flags);
+ df_add_problem (&problem_LR);
+ /* These will be initialized when df_scan_blocks processes each
+ block. */
+ df_lr->out_of_date_transfer_functions = BITMAP_ALLOC (NULL);
}
-\f
-/*----------------------------------------------------------------------------
- LIVE REGISTERS
+/* Verify that all of the lr related info is consistent and
+ correct. */
- Find the locations in the function where any use of a pseudo can
- reach in the backwards direction. In and out bitvectors are built
- for each basic block. The regnum is used to index into these sets.
- See df.h for details.
- ----------------------------------------------------------------------------*/
+void
+df_lr_verify_transfer_functions (void)
+{
+ basic_block bb;
+ bitmap_head saved_def;
+ bitmap_head saved_use;
+ bitmap_head all_blocks;
+
+ if (!df)
+ return;
-/* Get basic block info. */
+ bitmap_initialize (&saved_def, &bitmap_default_obstack);
+ bitmap_initialize (&saved_use, &bitmap_default_obstack);
+ bitmap_initialize (&all_blocks, &bitmap_default_obstack);
-struct df_lr_bb_info *
-df_lr_get_bb_info (struct dataflow *dflow, unsigned int index)
-{
- return (struct df_lr_bb_info *) dflow->block_info[index];
+ FOR_ALL_BB (bb)
+ {
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb->index);
+ bitmap_set_bit (&all_blocks, bb->index);
+
+ if (bb_info)
+ {
+ /* Make a copy of the transfer functions and then compute
+ new ones to see if the transfer functions have
+ changed. */
+ if (!bitmap_bit_p (df_lr->out_of_date_transfer_functions,
+ bb->index))
+ {
+ bitmap_copy (&saved_def, &bb_info->def);
+ bitmap_copy (&saved_use, &bb_info->use);
+ bitmap_clear (&bb_info->def);
+ bitmap_clear (&bb_info->use);
+
+ df_lr_bb_local_compute (bb->index);
+ gcc_assert (bitmap_equal_p (&saved_def, &bb_info->def));
+ gcc_assert (bitmap_equal_p (&saved_use, &bb_info->use));
+ }
+ }
+ else
+ {
+ /* If we do not have basic block info, the block must be in
+ the list of dirty blocks or else some one has added a
+ block behind our backs. */
+ gcc_assert (bitmap_bit_p (df_lr->out_of_date_transfer_functions,
+ bb->index));
+ }
+ /* Make sure no one created a block without following
+ procedures. */
+ gcc_assert (df_scan_get_bb_info (bb->index));
+ }
+
+ /* Make sure there are no dirty bits in blocks that have been deleted. */
+ gcc_assert (!bitmap_intersect_compl_p (df_lr->out_of_date_transfer_functions,
+ &all_blocks));
+
+ bitmap_clear (&saved_def);
+ bitmap_clear (&saved_use);
+ bitmap_clear (&all_blocks);
}
-/* Set basic block info. */
+\f
+/*----------------------------------------------------------------------------
+ LIVE AND MUST-INITIALIZED REGISTERS.
+
+ This problem first computes the IN and OUT bitvectors for the
+ must-initialized registers problems, which is a forward problem.
+ It gives the set of registers for which we MUST have an available
+ definition on any path from the entry block to the entry/exit of
+ a basic block. Sets generate a definition, while clobbers kill
+ a definition.
+
+ In and out bitvectors are built for each basic block and are indexed by
+ regnum (see df.h for details). In and out bitvectors in struct
+ df_live_bb_info actually refers to the must-initialized problem;
+
+ Then, the in and out sets for the LIVE problem itself are computed.
+ These are the logical AND of the IN and OUT sets from the LR problem
+ and the must-initialized problem.
+----------------------------------------------------------------------------*/
-static void
-df_lr_set_bb_info (struct dataflow *dflow, unsigned int index,
- struct df_lr_bb_info *bb_info)
+/* Private data used to verify the solution for this problem. */
+struct df_live_problem_data
{
- dflow->block_info[index] = bb_info;
-}
+ bitmap_head *in;
+ bitmap_head *out;
+ /* An obstack for the bitmaps we need for this problem. */
+ bitmap_obstack live_bitmaps;
+};
+
+/* Scratch var used by transfer functions. This is used to implement
+ an optimization to reduce the amount of space used to compute the
+ combined lr and live analysis. */
+static bitmap_head df_live_scratch;
+
-
/* Free basic block info. */
static void
-df_lr_free_bb_info (struct dataflow *dflow,
- basic_block bb ATTRIBUTE_UNUSED,
+df_live_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
void *vbb_info)
{
- struct df_lr_bb_info *bb_info = (struct df_lr_bb_info *) vbb_info;
+ struct df_live_bb_info *bb_info = (struct df_live_bb_info *) vbb_info;
if (bb_info)
{
- BITMAP_FREE (bb_info->use);
- BITMAP_FREE (bb_info->def);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- pool_free (dflow->block_pool, bb_info);
+ bitmap_clear (&bb_info->gen);
+ bitmap_clear (&bb_info->kill);
+ bitmap_clear (&bb_info->in);
+ bitmap_clear (&bb_info->out);
}
}
-/* Allocate or reset bitmaps for DFLOW blocks. The solution bits are
+/* Allocate or reset bitmaps for DF_LIVE blocks. The solution bits are
not touched unless the block is new. */
-static void
-df_lr_alloc (struct dataflow *dflow, bitmap blocks_to_rescan,
- bitmap all_blocks ATTRIBUTE_UNUSED)
+static void
+df_live_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
unsigned int bb_index;
bitmap_iterator bi;
+ struct df_live_problem_data *problem_data;
+
+ if (df_live->problem_data)
+ problem_data = (struct df_live_problem_data *) df_live->problem_data;
+ else
+ {
+ problem_data = XNEW (struct df_live_problem_data);
+ df_live->problem_data = problem_data;
- if (!dflow->block_pool)
- dflow->block_pool = create_alloc_pool ("df_lr_block pool",
- sizeof (struct df_lr_bb_info), 50);
+ problem_data->out = NULL;
+ problem_data->in = NULL;
+ bitmap_obstack_initialize (&problem_data->live_bitmaps);
+ bitmap_initialize (&df_live_scratch, &problem_data->live_bitmaps);
+ }
- df_grow_bb_info (dflow);
+ df_grow_bb_info (df_live);
- EXECUTE_IF_SET_IN_BITMAP (blocks_to_rescan, 0, bb_index, bi)
+ EXECUTE_IF_SET_IN_BITMAP (df_live->out_of_date_transfer_functions, 0, bb_index, bi)
{
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, bb_index);
- if (bb_info)
- {
- bitmap_clear (bb_info->def);
- bitmap_clear (bb_info->use);
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb_index);
+
+ /* When bitmaps are already initialized, just clear them. */
+ if (bb_info->kill.obstack)
+ {
+ bitmap_clear (&bb_info->kill);
+ bitmap_clear (&bb_info->gen);
}
else
- {
- bb_info = (struct df_lr_bb_info *) pool_alloc (dflow->block_pool);
- df_lr_set_bb_info (dflow, bb_index, bb_info);
- bb_info->use = BITMAP_ALLOC (NULL);
- bb_info->def = BITMAP_ALLOC (NULL);
- bb_info->in = BITMAP_ALLOC (NULL);
- bb_info->out = BITMAP_ALLOC (NULL);
+ {
+ bitmap_initialize (&bb_info->kill, &problem_data->live_bitmaps);
+ bitmap_initialize (&bb_info->gen, &problem_data->live_bitmaps);
+ bitmap_initialize (&bb_info->in, &problem_data->live_bitmaps);
+ bitmap_initialize (&bb_info->out, &problem_data->live_bitmaps);
}
}
+ df_live->optional_p = (optimize <= 1);
}
-/* Compute local live register info for basic block BB. */
+/* Reset the global solution for recalculation. */
static void
-df_lr_bb_local_compute (struct dataflow *dflow,
- struct df *df, unsigned int bb_index)
+df_live_reset (bitmap all_blocks)
{
- basic_block bb = BASIC_BLOCK (bb_index);
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, bb_index);
- rtx insn;
- struct df_ref *def;
- struct df_ref *use;
+ unsigned int bb_index;
+ bitmap_iterator bi;
- /* Process the registers set in an exception handler. */
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if (((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
- && (!(DF_REF_FLAGS (def) & DF_REF_PARTIAL)))
- {
- unsigned int dregno = DF_REF_REGNO (def);
- bitmap_set_bit (bb_info->def, dregno);
- bitmap_clear_bit (bb_info->use, dregno);
- }
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ {
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb_index);
+ gcc_assert (bb_info);
+ bitmap_clear (&bb_info->in);
+ bitmap_clear (&bb_info->out);
+ }
+}
- /* Process the hardware registers that are always live. */
- for (use = df_get_artificial_uses (df, bb_index); use; use = use->next_ref)
- /* Add use to set of uses in this BB. */
- if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
- bitmap_set_bit (bb_info->use, DF_REF_REGNO (use));
- FOR_BB_INSNS_REVERSE (bb, insn)
+/* Compute local uninitialized register info for basic block BB. */
+
+static void
+df_live_bb_local_compute (unsigned int bb_index)
+{
+ basic_block bb = BASIC_BLOCK (bb_index);
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb_index);
+ rtx insn;
+ df_ref *def_rec;
+ int luid = 0;
+
+ FOR_BB_INSNS (bb, insn)
{
unsigned int uid = INSN_UID (insn);
+ struct df_insn_info *insn_info = DF_INSN_UID_GET (uid);
- if (!INSN_P (insn))
- continue;
-
- if (CALL_P (insn))
+ /* Inserting labels does not always trigger the incremental
+ rescanning. */
+ if (!insn_info)
{
- for (def = DF_INSN_UID_DEFS (df, uid); def; def = def->next_ref)
- {
- unsigned int dregno = DF_REF_REGNO (def);
-
- if (dregno >= FIRST_PSEUDO_REGISTER
- || !(SIBLING_CALL_P (insn)
- && bitmap_bit_p (df->exit_block_uses, dregno)
- && !refers_to_regno_p (dregno, dregno+1,
- current_function_return_rtx,
- (rtx *)0)))
- {
- /* If the def is to only part of the reg, it does
- not kill the other defs that reach here. */
- if (!(DF_REF_FLAGS (def) & DF_REF_PARTIAL))
- {
- bitmap_set_bit (bb_info->def, dregno);
- bitmap_clear_bit (bb_info->use, dregno);
- }
- }
- }
+ gcc_assert (!INSN_P (insn));
+ insn_info = df_insn_create_insn_record (insn);
}
- else
+
+ DF_INSN_INFO_LUID (insn_info) = luid;
+ if (!INSN_P (insn))
+ continue;
+
+ luid++;
+ for (def_rec = DF_INSN_INFO_DEFS (insn_info); *def_rec; def_rec++)
{
- for (def = DF_INSN_UID_DEFS (df, uid); def; def = def->next_ref)
- {
- unsigned int dregno = DF_REF_REGNO (def);
-
- if (DF_INSN_CONTAINS_ASM (df, insn)
- && dregno < FIRST_PSEUDO_REGISTER)
- {
- unsigned int i;
- unsigned int end = dregno
- + hard_regno_nregs[dregno][GET_MODE (DF_REF_REG (def))] - 1;
- for (i = dregno; i <= end; ++i)
- regs_asm_clobbered[i] = 1;
- }
- /* If the def is to only part of the reg, it does
- not kill the other defs that reach here. */
- if (!(DF_REF_FLAGS (def) & DF_REF_PARTIAL))
- {
- bitmap_set_bit (bb_info->def, dregno);
- bitmap_clear_bit (bb_info->use, dregno);
- }
- }
- }
+ df_ref def = *def_rec;
+ unsigned int regno = DF_REF_REGNO (def);
- for (use = DF_INSN_UID_USES (df, uid); use; use = use->next_ref)
- /* Add use to set of uses in this BB. */
- bitmap_set_bit (bb_info->use, DF_REF_REGNO (use));
+ if (DF_REF_FLAGS_IS_SET (def,
+ DF_REF_PARTIAL | DF_REF_CONDITIONAL))
+ /* All partial or conditional def
+ seen are included in the gen set. */
+ bitmap_set_bit (&bb_info->gen, regno);
+ else if (DF_REF_FLAGS_IS_SET (def, DF_REF_MUST_CLOBBER))
+ /* Only must clobbers for the entire reg destroy the
+ value. */
+ bitmap_set_bit (&bb_info->kill, regno);
+ else if (! DF_REF_FLAGS_IS_SET (def, DF_REF_MAY_CLOBBER))
+ bitmap_set_bit (&bb_info->gen, regno);
+ }
}
- /* Process the registers set in an exception handler. */
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP)
- && (!(DF_REF_FLAGS (def) & DF_REF_PARTIAL)))
- {
- unsigned int dregno = DF_REF_REGNO (def);
- bitmap_set_bit (bb_info->def, dregno);
- bitmap_clear_bit (bb_info->use, dregno);
- }
-
-#ifdef EH_USES
- /* Process the uses that are live into an exception handler. */
- for (use = df_get_artificial_uses (df, bb_index); use; use = use->next_ref)
- /* Add use to set of uses in this BB. */
- if (DF_REF_FLAGS (use) & DF_REF_AT_TOP)
- bitmap_set_bit (bb_info->use, DF_REF_REGNO (use));
-#endif
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ bitmap_set_bit (&bb_info->gen, DF_REF_REGNO (def));
+ }
}
-/* Compute local live register info for each basic block within BLOCKS. */
+/* Compute local uninitialized register info. */
static void
-df_lr_local_compute (struct dataflow *dflow,
- bitmap all_blocks,
- bitmap rescan_blocks)
+df_live_local_compute (bitmap all_blocks ATTRIBUTE_UNUSED)
{
- struct df *df = dflow->df;
unsigned int bb_index;
bitmap_iterator bi;
-
- /* Assume that the stack pointer is unchanging if alloca hasn't
- been used. */
- if (bitmap_equal_p (all_blocks, rescan_blocks))
- memset (regs_asm_clobbered, 0, sizeof (regs_asm_clobbered));
-
- bitmap_clear (df->hardware_regs_used);
-
- /* The all-important stack pointer must always be live. */
- bitmap_set_bit (df->hardware_regs_used, STACK_POINTER_REGNUM);
-
- /* Before reload, there are a few registers that must be forced
- live everywhere -- which might not already be the case for
- blocks within infinite loops. */
- if (!reload_completed)
- {
- /* Any reference to any pseudo before reload is a potential
- reference of the frame pointer. */
- bitmap_set_bit (df->hardware_regs_used, FRAME_POINTER_REGNUM);
-
-#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
- /* Pseudos with argument area equivalences may require
- reloading via the argument pointer. */
- if (fixed_regs[ARG_POINTER_REGNUM])
- bitmap_set_bit (df->hardware_regs_used, ARG_POINTER_REGNUM);
-#endif
-
- /* Any constant, or pseudo with constant equivalences, may
- require reloading from memory using the pic register. */
- if ((unsigned) PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM
- && fixed_regs[PIC_OFFSET_TABLE_REGNUM])
- bitmap_set_bit (df->hardware_regs_used, PIC_OFFSET_TABLE_REGNUM);
- }
-
- if (bitmap_bit_p (rescan_blocks, EXIT_BLOCK))
- {
- /* The exit block is special for this problem and its bits are
- computed from thin air. */
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, EXIT_BLOCK);
- bitmap_copy (bb_info->use, df->exit_block_uses);
- }
-
- EXECUTE_IF_SET_IN_BITMAP (rescan_blocks, 0, bb_index, bi)
+
+ df_grow_insn_info ();
+
+ EXECUTE_IF_SET_IN_BITMAP (df_live->out_of_date_transfer_functions,
+ 0, bb_index, bi)
{
- if (bb_index == EXIT_BLOCK)
- continue;
- df_lr_bb_local_compute (dflow, df, bb_index);
+ df_live_bb_local_compute (bb_index);
}
+
+ bitmap_clear (df_live->out_of_date_transfer_functions);
}
/* Initialize the solution vectors. */
-static void
-df_lr_init (struct dataflow *dflow, bitmap all_blocks)
+static void
+df_live_init (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, bb_index);
- bitmap_copy (bb_info->in, bb_info->use);
- bitmap_clear (bb_info->out);
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb_index);
+ struct df_lr_bb_info *bb_lr_info = df_lr_get_bb_info (bb_index);
+
+ /* No register may reach a location where it is not used. Thus
+ we trim the rr result to the places where it is used. */
+ bitmap_and (&bb_info->out, &bb_info->gen, &bb_lr_info->out);
+ bitmap_clear (&bb_info->in);
}
}
+/* Forward confluence function that ignores fake edges. */
-/* Confluence function that processes infinite loops. This might be a
- noreturn function that throws. And even if it isn't, getting the
- unwind info right helps debugging. */
-static void
-df_lr_confluence_0 (struct dataflow *dflow, basic_block bb)
+static bool
+df_live_confluence_n (edge e)
{
- struct df *df = dflow->df;
-
- bitmap op1 = df_lr_get_bb_info (dflow, bb->index)->out;
- if (bb != EXIT_BLOCK_PTR)
- bitmap_copy (op1, df->hardware_regs_used);
-}
+ bitmap op1 = &df_live_get_bb_info (e->dest->index)->in;
+ bitmap op2 = &df_live_get_bb_info (e->src->index)->out;
+ if (e->flags & EDGE_FAKE)
+ return false;
-/* Confluence function that ignores fake edges. */
-
-static void
-df_lr_confluence_n (struct dataflow *dflow, edge e)
-{
- bitmap op1 = df_lr_get_bb_info (dflow, e->src->index)->out;
- bitmap op2 = df_lr_get_bb_info (dflow, e->dest->index)->in;
-
- /* Call-clobbered registers die across exception and call edges. */
- /* ??? Abnormal call edges ignored for the moment, as this gets
- confused by sibling call edges, which crashes reg-stack. */
- if (e->flags & EDGE_EH)
- bitmap_ior_and_compl_into (op1, op2, df_invalidated_by_call);
- else
- bitmap_ior_into (op1, op2);
-
- bitmap_ior_into (op1, dflow->df->hardware_regs_used);
-}
+ return bitmap_ior_into (op1, op2);
+}
-/* Transfer function. */
+/* Transfer function for the forwards must-initialized problem. */
static bool
-df_lr_transfer_function (struct dataflow *dflow, int bb_index)
+df_live_transfer_function (int bb_index)
{
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, bb_index);
- bitmap in = bb_info->in;
- bitmap out = bb_info->out;
- bitmap use = bb_info->use;
- bitmap def = bb_info->def;
-
- return bitmap_ior_and_compl (in, use, out, def);
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb_index);
+ struct df_lr_bb_info *bb_lr_info = df_lr_get_bb_info (bb_index);
+ bitmap in = &bb_info->in;
+ bitmap out = &bb_info->out;
+ bitmap gen = &bb_info->gen;
+ bitmap kill = &bb_info->kill;
+
+ /* We need to use a scratch set here so that the value returned from this
+ function invocation properly reflects whether the sets changed in a
+ significant way; i.e. not just because the lr set was anded in. */
+ bitmap_and (&df_live_scratch, gen, &bb_lr_info->out);
+ /* No register may reach a location where it is not used. Thus
+ we trim the rr result to the places where it is used. */
+ bitmap_and_into (in, &bb_lr_info->in);
+
+ return bitmap_ior_and_compl (out, &df_live_scratch, in, kill);
}
-/* Free all storage associated with the problem. */
+/* And the LR info with the must-initialized registers, to produce the LIVE info. */
static void
-df_lr_free (struct dataflow *dflow)
+df_live_finalize (bitmap all_blocks)
{
- if (dflow->block_info)
+
+ if (df_live->solutions_dirty)
{
- unsigned int i;
- for (i = 0; i < dflow->block_info_size; i++)
+ bitmap_iterator bi;
+ unsigned int bb_index;
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, i);
- if (bb_info)
- {
- BITMAP_FREE (bb_info->use);
- BITMAP_FREE (bb_info->def);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- }
+ struct df_lr_bb_info *bb_lr_info = df_lr_get_bb_info (bb_index);
+ struct df_live_bb_info *bb_live_info = df_live_get_bb_info (bb_index);
+
+ /* No register may reach a location where it is not used. Thus
+ we trim the rr result to the places where it is used. */
+ bitmap_and_into (&bb_live_info->in, &bb_lr_info->in);
+ bitmap_and_into (&bb_live_info->out, &bb_lr_info->out);
}
- free_alloc_pool (dflow->block_pool);
-
- dflow->block_info_size = 0;
- free (dflow->block_info);
- }
- free (dflow->problem_data);
- free (dflow);
+ df_live->solutions_dirty = false;
+ }
}
-/* Debugging info. */
+/* Free all storage associated with the problem. */
static void
-df_lr_dump (struct dataflow *dflow, FILE *file)
+df_live_free (void)
{
- basic_block bb;
-
- if (!dflow->block_info)
- return;
-
- fprintf (file, "Live Registers:\n");
- FOR_ALL_BB (bb)
+ struct df_live_problem_data *problem_data
+ = (struct df_live_problem_data *) df_live->problem_data;
+ if (df_live->block_info)
{
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, bb->index);
- df_print_bb_index (bb, file);
-
- if (!bb_info->in)
- continue;
-
- fprintf (file, " in \t");
- dump_bitmap (file, bb_info->in);
- fprintf (file, " use \t");
- dump_bitmap (file, bb_info->use);
- fprintf (file, " def \t");
- dump_bitmap (file, bb_info->def);
- fprintf (file, " out \t");
- dump_bitmap (file, bb_info->out);
+ df_live->block_info_size = 0;
+ free (df_live->block_info);
+ df_live->block_info = NULL;
+ bitmap_clear (&df_live_scratch);
+ bitmap_obstack_release (&problem_data->live_bitmaps);
+ free (problem_data);
+ df_live->problem_data = NULL;
}
+ BITMAP_FREE (df_live->out_of_date_transfer_functions);
+ free (df_live);
}
-/* All of the information associated with every instance of the problem. */
-
-static struct df_problem problem_LR =
-{
- DF_LR, /* Problem id. */
- DF_BACKWARD, /* Direction. */
- df_lr_alloc, /* Allocate the problem specific data. */
- NULL, /* Reset global information. */
- df_lr_free_bb_info, /* Free basic block info. */
- df_lr_local_compute, /* Local compute function. */
- df_lr_init, /* Init the solution specific data. */
- df_iterative_dataflow, /* Iterative solver. */
- df_lr_confluence_0, /* Confluence operator 0. */
- df_lr_confluence_n, /* Confluence operator n. */
- df_lr_transfer_function, /* Transfer function. */
- NULL, /* Finalize function. */
- df_lr_free, /* Free all of the problem information. */
- df_lr_dump, /* Debugging. */
- NULL, /* Dependent problem. */
- 0
-};
-
-/* Create a new DATAFLOW instance and add it to an existing instance
- of DF. The returned structure is what is used to get at the
- solution. */
+/* Debugging info at top of bb. */
-struct dataflow *
-df_lr_add_problem (struct df *df, int flags)
+static void
+df_live_top_dump (basic_block bb, FILE *file)
{
- return df_add_problem (df, &problem_LR, flags);
-}
-
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb->index);
+ struct df_live_problem_data *problem_data;
-\f
-/*----------------------------------------------------------------------------
- UNINITIALIZED REGISTERS
-
- Find the set of uses for registers that are reachable from the entry
- block without passing thru a definition. In and out bitvectors are built
- for each basic block. The regnum is used to index into these sets.
- See df.h for details.
-----------------------------------------------------------------------------*/
-
-/* Get basic block info. */
+ if (!bb_info)
+ return;
-struct df_ur_bb_info *
-df_ur_get_bb_info (struct dataflow *dflow, unsigned int index)
-{
- return (struct df_ur_bb_info *) dflow->block_info[index];
+ fprintf (file, ";; live in \t");
+ df_print_regset (file, &bb_info->in);
+ if (df_live->problem_data)
+ {
+ problem_data = (struct df_live_problem_data *)df_live->problem_data;
+ if (problem_data->in)
+ {
+ fprintf (file, ";; old in \t");
+ df_print_regset (file, &problem_data->in[bb->index]);
+ }
+ }
+ fprintf (file, ";; live gen \t");
+ df_print_regset (file, &bb_info->gen);
+ fprintf (file, ";; live kill\t");
+ df_print_regset (file, &bb_info->kill);
}
-/* Set basic block info. */
+/* Debugging info at bottom of bb. */
static void
-df_ur_set_bb_info (struct dataflow *dflow, unsigned int index,
- struct df_ur_bb_info *bb_info)
+df_live_bottom_dump (basic_block bb, FILE *file)
{
- dflow->block_info[index] = bb_info;
-}
-
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb->index);
+ struct df_live_problem_data *problem_data;
-/* Free basic block info. */
+ if (!bb_info)
+ return;
-static void
-df_ur_free_bb_info (struct dataflow *dflow,
- basic_block bb ATTRIBUTE_UNUSED,
- void *vbb_info)
-{
- struct df_ur_bb_info *bb_info = (struct df_ur_bb_info *) vbb_info;
- if (bb_info)
+ fprintf (file, ";; live out \t");
+ df_print_regset (file, &bb_info->out);
+ if (df_live->problem_data)
{
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- pool_free (dflow->block_pool, bb_info);
+ problem_data = (struct df_live_problem_data *)df_live->problem_data;
+ if (problem_data->out)
+ {
+ fprintf (file, ";; old out \t");
+ df_print_regset (file, &problem_data->out[bb->index]);
+ }
}
}
-/* Allocate or reset bitmaps for DFLOW blocks. The solution bits are
- not touched unless the block is new. */
+/* Build the datastructure to verify that the solution to the dataflow
+ equations is not dirty. */
-static void
-df_ur_alloc (struct dataflow *dflow, bitmap blocks_to_rescan,
- bitmap all_blocks ATTRIBUTE_UNUSED)
+static void
+df_live_verify_solution_start (void)
{
- unsigned int bb_index;
- bitmap_iterator bi;
+ basic_block bb;
+ struct df_live_problem_data *problem_data;
+ if (df_live->solutions_dirty)
+ return;
- if (!dflow->block_pool)
- dflow->block_pool = create_alloc_pool ("df_ur_block pool",
- sizeof (struct df_ur_bb_info), 100);
+ /* Set it true so that the solution is recomputed. */
+ df_live->solutions_dirty = true;
- df_grow_bb_info (dflow);
+ problem_data = (struct df_live_problem_data *)df_live->problem_data;
+ problem_data->in = XNEWVEC (bitmap_head, last_basic_block);
+ problem_data->out = XNEWVEC (bitmap_head, last_basic_block);
- EXECUTE_IF_SET_IN_BITMAP (blocks_to_rescan, 0, bb_index, bi)
+ FOR_ALL_BB (bb)
{
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb_index);
- if (bb_info)
- {
- bitmap_clear (bb_info->kill);
- bitmap_clear (bb_info->gen);
- }
- else
- {
- bb_info = (struct df_ur_bb_info *) pool_alloc (dflow->block_pool);
- df_ur_set_bb_info (dflow, bb_index, bb_info);
- bb_info->kill = BITMAP_ALLOC (NULL);
- bb_info->gen = BITMAP_ALLOC (NULL);
- bb_info->in = BITMAP_ALLOC (NULL);
- bb_info->out = BITMAP_ALLOC (NULL);
- }
+ bitmap_initialize (&problem_data->in[bb->index], &problem_data->live_bitmaps);
+ bitmap_initialize (&problem_data->out[bb->index], &problem_data->live_bitmaps);
+ bitmap_copy (&problem_data->in[bb->index], DF_LIVE_IN (bb));
+ bitmap_copy (&problem_data->out[bb->index], DF_LIVE_OUT (bb));
}
}
-/* Compute local uninitialized register info for basic block BB. */
+/* Compare the saved datastructure and the new solution to the dataflow
+ equations. */
static void
-df_ur_bb_local_compute (struct dataflow *dflow, unsigned int bb_index)
+df_live_verify_solution_end (void)
{
- struct df *df = dflow->df;
- basic_block bb = BASIC_BLOCK (bb_index);
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb_index);
- rtx insn;
- struct df_ref *def;
-
- bitmap_clear (seen_in_block);
- bitmap_clear (seen_in_insn);
+ struct df_live_problem_data *problem_data;
+ basic_block bb;
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
- {
- unsigned int regno = DF_REF_REGNO (def);
- if (!bitmap_bit_p (seen_in_block, regno))
- {
- bitmap_set_bit (seen_in_block, regno);
- bitmap_set_bit (bb_info->gen, regno);
- }
- }
+ problem_data = (struct df_live_problem_data *)df_live->problem_data;
+ if (!problem_data->out)
+ return;
- FOR_BB_INSNS_REVERSE (bb, insn)
+ FOR_ALL_BB (bb)
{
- unsigned int uid = INSN_UID (insn);
- if (!INSN_P (insn))
- continue;
-
- for (def = DF_INSN_UID_DEFS (df, uid); def; def = def->next_ref)
+ if ((!bitmap_equal_p (&problem_data->in[bb->index], DF_LIVE_IN (bb)))
+ || (!bitmap_equal_p (&problem_data->out[bb->index], DF_LIVE_OUT (bb))))
{
- unsigned int regno = DF_REF_REGNO (def);
- /* Only the last def counts. */
- if (!bitmap_bit_p (seen_in_block, regno))
- {
- bitmap_set_bit (seen_in_insn, regno);
-
- if (DF_REF_FLAGS (def)
- & (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER))
- {
- /* Only must clobbers for the entire reg destroy the
- value. */
- if ((DF_REF_FLAGS (def) & DF_REF_MUST_CLOBBER)
- && (!DF_REF_FLAGS (def) & DF_REF_PARTIAL))
- bitmap_set_bit (bb_info->kill, regno);
- }
- else
- bitmap_set_bit (bb_info->gen, regno);
- }
+ /*df_dump (stderr);*/
+ gcc_unreachable ();
}
- bitmap_ior_into (seen_in_block, seen_in_insn);
- bitmap_clear (seen_in_insn);
}
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
- {
- unsigned int regno = DF_REF_REGNO (def);
- if (!bitmap_bit_p (seen_in_block, regno))
- {
- bitmap_set_bit (seen_in_block, regno);
- bitmap_set_bit (bb_info->gen, regno);
- }
- }
+ /* Cannot delete them immediately because you may want to dump them
+ if the comparison fails. */
+ FOR_ALL_BB (bb)
+ {
+ bitmap_clear (&problem_data->in[bb->index]);
+ bitmap_clear (&problem_data->out[bb->index]);
+ }
+
+ free (problem_data->in);
+ free (problem_data->out);
+ free (problem_data);
+ df_live->problem_data = NULL;
}
-/* Compute local uninitialized register info. */
+/* All of the information associated with every instance of the problem. */
-static void
-df_ur_local_compute (struct dataflow *dflow,
- bitmap all_blocks ATTRIBUTE_UNUSED,
- bitmap rescan_blocks)
+static struct df_problem problem_LIVE =
{
- unsigned int bb_index;
- bitmap_iterator bi;
+ DF_LIVE, /* Problem id. */
+ DF_FORWARD, /* Direction. */
+ df_live_alloc, /* Allocate the problem specific data. */
+ df_live_reset, /* Reset global information. */
+ df_live_free_bb_info, /* Free basic block info. */
+ df_live_local_compute, /* Local compute function. */
+ df_live_init, /* Init the solution specific data. */
+ df_worklist_dataflow, /* Worklist solver. */
+ NULL, /* Confluence operator 0. */
+ df_live_confluence_n, /* Confluence operator n. */
+ df_live_transfer_function, /* Transfer function. */
+ df_live_finalize, /* Finalize function. */
+ df_live_free, /* Free all of the problem information. */
+ df_live_free, /* Remove this problem from the stack of dataflow problems. */
+ NULL, /* Debugging. */
+ df_live_top_dump, /* Debugging start block. */
+ df_live_bottom_dump, /* Debugging end block. */
+ df_live_verify_solution_start,/* Incremental solution verify start. */
+ df_live_verify_solution_end, /* Incremental solution verify end. */
+ &problem_LR, /* Dependent problem. */
+ sizeof (struct df_live_bb_info),/* Size of entry of block_info array. */
+ TV_DF_LIVE, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
+};
- df_set_seen ();
- EXECUTE_IF_SET_IN_BITMAP (rescan_blocks, 0, bb_index, bi)
- {
- df_ur_bb_local_compute (dflow, bb_index);
- }
+/* Create a new DATAFLOW instance and add it to an existing instance
+ of DF. The returned structure is what is used to get at the
+ solution. */
- df_unset_seen ();
+void
+df_live_add_problem (void)
+{
+ df_add_problem (&problem_LIVE);
+ /* These will be initialized when df_scan_blocks processes each
+ block. */
+ df_live->out_of_date_transfer_functions = BITMAP_ALLOC (NULL);
}
-/* Initialize the solution vectors. */
+/* Set all of the blocks as dirty. This needs to be done if this
+ problem is added after all of the insns have been scanned. */
-static void
-df_ur_init (struct dataflow *dflow, bitmap all_blocks)
+void
+df_live_set_all_dirty (void)
{
- unsigned int bb_index;
- bitmap_iterator bi;
-
- EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
- {
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb_index);
-
- bitmap_copy (bb_info->out, bb_info->gen);
- bitmap_clear (bb_info->in);
- }
+ basic_block bb;
+ FOR_ALL_BB (bb)
+ bitmap_set_bit (df_live->out_of_date_transfer_functions,
+ bb->index);
}
-/* Or in the stack regs, hard regs and early clobber regs into the
- ur_in sets of all of the blocks. */
+/* Verify that all of the lr related info is consistent and
+ correct. */
-static void
-df_ur_local_finalize (struct dataflow *dflow, bitmap all_blocks)
+void
+df_live_verify_transfer_functions (void)
{
- struct df *df = dflow->df;
- struct dataflow *lr_dflow = df->problems_by_index[DF_LR];
- bitmap tmp = BITMAP_ALLOC (NULL);
- bitmap_iterator bi;
- unsigned int bb_index;
+ basic_block bb;
+ bitmap_head saved_gen;
+ bitmap_head saved_kill;
+ bitmap_head all_blocks;
- EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ if (!df)
+ return;
+
+ bitmap_initialize (&saved_gen, &bitmap_default_obstack);
+ bitmap_initialize (&saved_kill, &bitmap_default_obstack);
+ bitmap_initialize (&all_blocks, &bitmap_default_obstack);
+
+ df_grow_insn_info ();
+
+ FOR_ALL_BB (bb)
{
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb_index);
- struct df_lr_bb_info *bb_lr_info = df_lr_get_bb_info (lr_dflow, bb_index);
-
- /* No register may reach a location where it is not used. Thus
- we trim the rr result to the places where it is used. */
- bitmap_and_into (bb_info->in, bb_lr_info->in);
- bitmap_and_into (bb_info->out, bb_lr_info->out);
-
-#if 1
- /* Hard registers may still stick in the ur_out set, but not
- be in the ur_in set, if their only mention was in a call
- in this block. This is because a call kills in the lr
- problem but does not kill in the ur problem. To clean
- this up, we execute the transfer function on the lr_in
- set and then use that to knock bits out of ur_out. */
- bitmap_ior_and_compl (tmp, bb_info->gen, bb_lr_info->in,
- bb_info->kill);
- bitmap_and_into (bb_info->out, tmp);
-#endif
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb->index);
+ bitmap_set_bit (&all_blocks, bb->index);
+
+ if (bb_info)
+ {
+ /* Make a copy of the transfer functions and then compute
+ new ones to see if the transfer functions have
+ changed. */
+ if (!bitmap_bit_p (df_live->out_of_date_transfer_functions,
+ bb->index))
+ {
+ bitmap_copy (&saved_gen, &bb_info->gen);
+ bitmap_copy (&saved_kill, &bb_info->kill);
+ bitmap_clear (&bb_info->gen);
+ bitmap_clear (&bb_info->kill);
+
+ df_live_bb_local_compute (bb->index);
+ gcc_assert (bitmap_equal_p (&saved_gen, &bb_info->gen));
+ gcc_assert (bitmap_equal_p (&saved_kill, &bb_info->kill));
+ }
+ }
+ else
+ {
+ /* If we do not have basic block info, the block must be in
+ the list of dirty blocks or else some one has added a
+ block behind our backs. */
+ gcc_assert (bitmap_bit_p (df_live->out_of_date_transfer_functions,
+ bb->index));
+ }
+ /* Make sure no one created a block without following
+ procedures. */
+ gcc_assert (df_scan_get_bb_info (bb->index));
}
- BITMAP_FREE (tmp);
+ /* Make sure there are no dirty bits in blocks that have been deleted. */
+ gcc_assert (!bitmap_intersect_compl_p (df_live->out_of_date_transfer_functions,
+ &all_blocks));
+ bitmap_clear (&saved_gen);
+ bitmap_clear (&saved_kill);
+ bitmap_clear (&all_blocks);
}
+\f
+/*----------------------------------------------------------------------------
+ CREATE DEF_USE (DU) and / or USE_DEF (UD) CHAINS
+ Link either the defs to the uses and / or the uses to the defs.
-/* Confluence function that ignores fake edges. */
-
-static void
-df_ur_confluence_n (struct dataflow *dflow, edge e)
-{
- bitmap op1 = df_ur_get_bb_info (dflow, e->dest->index)->in;
- bitmap op2 = df_ur_get_bb_info (dflow, e->src->index)->out;
-
- if (e->flags & EDGE_FAKE)
- return;
-
- bitmap_ior_into (op1, op2);
-}
+ These problems are set up like the other dataflow problems so that
+ they nicely fit into the framework. They are much simpler and only
+ involve a single traversal of instructions and an examination of
+ the reaching defs information (the dependent problem).
+----------------------------------------------------------------------------*/
+#define df_chain_problem_p(FLAG) (((enum df_chain_flags)df_chain->local_flags)&(FLAG))
-/* Transfer function. */
+/* Create a du or ud chain from SRC to DST and link it into SRC. */
-static bool
-df_ur_transfer_function (struct dataflow *dflow, int bb_index)
+struct df_link *
+df_chain_create (df_ref src, df_ref dst)
{
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb_index);
- bitmap in = bb_info->in;
- bitmap out = bb_info->out;
- bitmap gen = bb_info->gen;
- bitmap kill = bb_info->kill;
+ struct df_link *head = DF_REF_CHAIN (src);
+ struct df_link *link = (struct df_link *) pool_alloc (df_chain->block_pool);
- return bitmap_ior_and_compl (out, gen, in, kill);
+ DF_REF_CHAIN (src) = link;
+ link->next = head;
+ link->ref = dst;
+ return link;
}
-/* Free all storage associated with the problem. */
-
+/* Delete any du or ud chains that start at REF and point to
+ TARGET. */
static void
-df_ur_free (struct dataflow *dflow)
+df_chain_unlink_1 (df_ref ref, df_ref target)
{
- if (dflow->block_info)
+ struct df_link *chain = DF_REF_CHAIN (ref);
+ struct df_link *prev = NULL;
+
+ while (chain)
{
- unsigned int i;
-
- for (i = 0; i < dflow->block_info_size; i++)
+ if (chain->ref == target)
{
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, i);
- if (bb_info)
- {
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- }
+ if (prev)
+ prev->next = chain->next;
+ else
+ DF_REF_CHAIN (ref) = chain->next;
+ pool_free (df_chain->block_pool, chain);
+ return;
}
-
- free_alloc_pool (dflow->block_pool);
- dflow->block_info_size = 0;
- free (dflow->block_info);
+ prev = chain;
+ chain = chain->next;
}
- free (dflow);
}
-/* Debugging info. */
+/* Delete a du or ud chain that leave or point to REF. */
-static void
-df_ur_dump (struct dataflow *dflow, FILE *file)
+void
+df_chain_unlink (df_ref ref)
{
- basic_block bb;
-
- if (!dflow->block_info)
- return;
-
- fprintf (file, "Undefined regs:\n");
-
- FOR_ALL_BB (bb)
+ struct df_link *chain = DF_REF_CHAIN (ref);
+ while (chain)
{
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb->index);
- df_print_bb_index (bb, file);
-
- if (!bb_info->in)
- continue;
-
- fprintf (file, " in \t");
- dump_bitmap (file, bb_info->in);
- fprintf (file, " gen \t");
- dump_bitmap (file, bb_info->gen);
- fprintf (file, " kill\t");
- dump_bitmap (file, bb_info->kill);
- fprintf (file, " out \t");
- dump_bitmap (file, bb_info->out);
+ struct df_link *next = chain->next;
+ /* Delete the other side if it exists. */
+ df_chain_unlink_1 (chain->ref, ref);
+ pool_free (df_chain->block_pool, chain);
+ chain = next;
}
+ DF_REF_CHAIN (ref) = NULL;
}
-/* All of the information associated with every instance of the problem. */
-
-static struct df_problem problem_UR =
-{
- DF_UR, /* Problem id. */
- DF_FORWARD, /* Direction. */
- df_ur_alloc, /* Allocate the problem specific data. */
- NULL, /* Reset global information. */
- df_ur_free_bb_info, /* Free basic block info. */
- df_ur_local_compute, /* Local compute function. */
- df_ur_init, /* Init the solution specific data. */
- df_iterative_dataflow, /* Iterative solver. */
- NULL, /* Confluence operator 0. */
- df_ur_confluence_n, /* Confluence operator n. */
- df_ur_transfer_function, /* Transfer function. */
- df_ur_local_finalize, /* Finalize function. */
- df_ur_free, /* Free all of the problem information. */
- df_ur_dump, /* Debugging. */
- df_lr_add_problem, /* Dependent problem. */
- 0 /* Changeable flags. */
-};
-
-/* Create a new DATAFLOW instance and add it to an existing instance
- of DF. The returned structure is what is used to get at the
- solution. */
+/* Copy the du or ud chain starting at FROM_REF and attach it to
+ TO_REF. */
-struct dataflow *
-df_ur_add_problem (struct df *df, int flags)
+void
+df_chain_copy (df_ref to_ref,
+ struct df_link *from_ref)
{
- return df_add_problem (df, &problem_UR, flags);
+ while (from_ref)
+ {
+ df_chain_create (to_ref, from_ref->ref);
+ from_ref = from_ref->next;
+ }
}
-\f
-/*----------------------------------------------------------------------------
- UNINITIALIZED REGISTERS WITH EARLYCLOBBER
-
- Find the set of uses for registers that are reachable from the entry
- block without passing thru a definition. In and out bitvectors are built
- for each basic block. The regnum is used to index into these sets.
- See df.h for details.
-
- This is a variant of the UR problem above that has a lot of special
- features just for the register allocation phase. This problem
- should go a away if someone would fix the interference graph.
-
- ----------------------------------------------------------------------------*/
+/* Remove this problem from the stack of dataflow problems. */
-/* Private data used to compute the solution for this problem. These
- data structures are not accessible outside of this module. */
-struct df_urec_problem_data
+static void
+df_chain_remove_problem (void)
{
- bool earlyclobbers_found; /* True if any instruction contains an
- earlyclobber. */
-#ifdef STACK_REGS
- bitmap stack_regs; /* Registers that may be allocated to a STACK_REGS. */
-#endif
-};
+ bitmap_iterator bi;
+ unsigned int bb_index;
+ /* Wholesale destruction of the old chains. */
+ if (df_chain->block_pool)
+ free_alloc_pool (df_chain->block_pool);
-/* Get basic block info. */
+ EXECUTE_IF_SET_IN_BITMAP (df_chain->out_of_date_transfer_functions, 0, bb_index, bi)
+ {
+ rtx insn;
+ df_ref *def_rec;
+ df_ref *use_rec;
+ basic_block bb = BASIC_BLOCK (bb_index);
+
+ if (df_chain_problem_p (DF_DU_CHAIN))
+ for (def_rec = df_get_artificial_defs (bb->index); *def_rec; def_rec++)
+ DF_REF_CHAIN (*def_rec) = NULL;
+ if (df_chain_problem_p (DF_UD_CHAIN))
+ for (use_rec = df_get_artificial_uses (bb->index); *use_rec; use_rec++)
+ DF_REF_CHAIN (*use_rec) = NULL;
+
+ FOR_BB_INSNS (bb, insn)
+ {
+ unsigned int uid = INSN_UID (insn);
-struct df_urec_bb_info *
-df_urec_get_bb_info (struct dataflow *dflow, unsigned int index)
-{
- return (struct df_urec_bb_info *) dflow->block_info[index];
+ if (INSN_P (insn))
+ {
+ if (df_chain_problem_p (DF_DU_CHAIN))
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ DF_REF_CHAIN (*def_rec) = NULL;
+ if (df_chain_problem_p (DF_UD_CHAIN))
+ {
+ for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
+ DF_REF_CHAIN (*use_rec) = NULL;
+ for (use_rec = DF_INSN_UID_EQ_USES (uid); *use_rec; use_rec++)
+ DF_REF_CHAIN (*use_rec) = NULL;
+ }
+ }
+ }
+ }
+
+ bitmap_clear (df_chain->out_of_date_transfer_functions);
+ df_chain->block_pool = NULL;
}
-/* Set basic block info. */
+/* Remove the chain problem completely. */
static void
-df_urec_set_bb_info (struct dataflow *dflow, unsigned int index,
- struct df_urec_bb_info *bb_info)
+df_chain_fully_remove_problem (void)
{
- dflow->block_info[index] = bb_info;
+ df_chain_remove_problem ();
+ BITMAP_FREE (df_chain->out_of_date_transfer_functions);
+ free (df_chain);
}
-/* Free basic block info. */
+/* Create def-use or use-def chains. */
static void
-df_urec_free_bb_info (struct dataflow *dflow,
- basic_block bb ATTRIBUTE_UNUSED,
- void *vbb_info)
+df_chain_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
- struct df_urec_bb_info *bb_info = (struct df_urec_bb_info *) vbb_info;
- if (bb_info)
- {
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- BITMAP_FREE (bb_info->earlyclobber);
- pool_free (dflow->block_pool, bb_info);
- }
+ df_chain_remove_problem ();
+ df_chain->block_pool = create_alloc_pool ("df_chain_block pool",
+ sizeof (struct df_link), 50);
+ df_chain->optional_p = true;
}
-/* Allocate or reset bitmaps for DFLOW blocks. The solution bits are
- not touched unless the block is new. */
-
-static void
-df_urec_alloc (struct dataflow *dflow, bitmap blocks_to_rescan,
- bitmap all_blocks ATTRIBUTE_UNUSED)
+/* Reset all of the chains when the set of basic blocks changes. */
+static void
+df_chain_reset (bitmap blocks_to_clear ATTRIBUTE_UNUSED)
{
- unsigned int bb_index;
- bitmap_iterator bi;
- struct df_urec_problem_data *problem_data
- = (struct df_urec_problem_data *) dflow->problem_data;
-
- if (!dflow->block_pool)
- dflow->block_pool = create_alloc_pool ("df_urec_block pool",
- sizeof (struct df_urec_bb_info), 50);
-
- if (!dflow->problem_data)
- {
- problem_data = XNEW (struct df_urec_problem_data);
- dflow->problem_data = problem_data;
- }
- problem_data->earlyclobbers_found = false;
-
- df_grow_bb_info (dflow);
-
- EXECUTE_IF_SET_IN_BITMAP (blocks_to_rescan, 0, bb_index, bi)
- {
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, bb_index);
- if (bb_info)
- {
- bitmap_clear (bb_info->kill);
- bitmap_clear (bb_info->gen);
- bitmap_clear (bb_info->earlyclobber);
- }
- else
- {
- bb_info = (struct df_urec_bb_info *) pool_alloc (dflow->block_pool);
- df_urec_set_bb_info (dflow, bb_index, bb_info);
- bb_info->kill = BITMAP_ALLOC (NULL);
- bb_info->gen = BITMAP_ALLOC (NULL);
- bb_info->in = BITMAP_ALLOC (NULL);
- bb_info->out = BITMAP_ALLOC (NULL);
- bb_info->earlyclobber = BITMAP_ALLOC (NULL);
- }
- }
+ df_chain_remove_problem ();
}
-/* The function modifies local info for register REG being changed in
- SETTER. DATA is used to pass the current basic block info. */
+/* Create the chains for a list of USEs. */
static void
-df_urec_mark_reg_change (rtx reg, rtx setter, void *data)
+df_chain_create_bb_process_use (bitmap local_rd,
+ df_ref *use_rec,
+ int top_flag)
{
- int regno;
- int endregno;
- int i;
- struct df_urec_bb_info *bb_info = (struct df_urec_bb_info*) data;
-
- if (GET_CODE (reg) == SUBREG)
- reg = SUBREG_REG (reg);
+ bitmap_iterator bi;
+ unsigned int def_index;
- if (!REG_P (reg))
- return;
-
- regno = REGNO (reg);
- if (regno < FIRST_PSEUDO_REGISTER)
+ while (*use_rec)
{
- endregno = END_HARD_REGNO (reg);
- for (i = regno; i < endregno; i++)
+ df_ref use = *use_rec;
+ unsigned int uregno = DF_REF_REGNO (use);
+ if ((!(df->changeable_flags & DF_NO_HARD_REGS))
+ || (uregno >= FIRST_PSEUDO_REGISTER))
{
- bitmap_set_bit (bb_info->kill, i);
-
- if (GET_CODE (setter) != CLOBBER)
- bitmap_set_bit (bb_info->gen, i);
- else
- bitmap_clear_bit (bb_info->gen, i);
+ /* Do not want to go through this for an uninitialized var. */
+ int count = DF_DEFS_COUNT (uregno);
+ if (count)
+ {
+ if (top_flag == (DF_REF_FLAGS (use) & DF_REF_AT_TOP))
+ {
+ unsigned int first_index = DF_DEFS_BEGIN (uregno);
+ unsigned int last_index = first_index + count - 1;
+
+ EXECUTE_IF_SET_IN_BITMAP (local_rd, first_index, def_index, bi)
+ {
+ df_ref def;
+ if (def_index > last_index)
+ break;
+
+ def = DF_DEFS_GET (def_index);
+ if (df_chain_problem_p (DF_DU_CHAIN))
+ df_chain_create (def, use);
+ if (df_chain_problem_p (DF_UD_CHAIN))
+ df_chain_create (use, def);
+ }
+ }
+ }
}
- }
- else
- {
- bitmap_set_bit (bb_info->kill, regno);
-
- if (GET_CODE (setter) != CLOBBER)
- bitmap_set_bit (bb_info->gen, regno);
- else
- bitmap_clear_bit (bb_info->gen, regno);
+
+ use_rec++;
}
}
-/* Classes of registers which could be early clobbered in the current
- insn. */
-static VEC(int,heap) *earlyclobber_regclass;
-/* This function finds and stores register classes that could be early
- clobbered in INSN. If any earlyclobber classes are found, the function
- returns TRUE, in all other cases it returns FALSE. */
+/* Create chains from reaching defs bitmaps for basic block BB. */
-static bool
-df_urec_check_earlyclobber (rtx insn)
+static void
+df_chain_create_bb (unsigned int bb_index)
{
- int opno;
- bool found = false;
-
- extract_insn (insn);
+ basic_block bb = BASIC_BLOCK (bb_index);
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb_index);
+ rtx insn;
+ bitmap_head cpy;
- VEC_truncate (int, earlyclobber_regclass, 0);
- for (opno = 0; opno < recog_data.n_operands; opno++)
- {
- char c;
- bool amp_p;
- int i;
- enum reg_class class;
- const char *p = recog_data.constraints[opno];
+ bitmap_initialize (&cpy, &bitmap_default_obstack);
+ bitmap_copy (&cpy, &bb_info->in);
+ bitmap_set_bit (df_chain->out_of_date_transfer_functions, bb_index);
- class = NO_REGS;
- amp_p = false;
- for (;;)
- {
- c = *p;
- switch (c)
- {
- case '=': case '+': case '?':
- case '#': case '!':
- case '*': case '%':
- case 'm': case '<': case '>': case 'V': case 'o':
- case 'E': case 'F': case 'G': case 'H':
- case 's': case 'i': case 'n':
- case 'I': case 'J': case 'K': case 'L':
- case 'M': case 'N': case 'O': case 'P':
- case 'X':
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- /* These don't say anything we care about. */
- break;
+ /* Since we are going forwards, process the artificial uses first
+ then the artificial defs second. */
- case '&':
- amp_p = true;
- break;
- case '\0':
- case ',':
- if (amp_p && class != NO_REGS)
- {
- int rc;
+#ifdef EH_USES
+ /* Create the chains for the artificial uses from the EH_USES at the
+ beginning of the block. */
- found = true;
- for (i = 0;
- VEC_iterate (int, earlyclobber_regclass, i, rc);
- i++)
- {
- if (rc == (int) class)
- goto found_rc;
- }
+ /* Artificials are only hard regs. */
+ if (!(df->changeable_flags & DF_NO_HARD_REGS))
+ df_chain_create_bb_process_use (&cpy,
+ df_get_artificial_uses (bb->index),
+ DF_REF_AT_TOP);
+#endif
- /* We use VEC_quick_push here because
- earlyclobber_regclass holds no more than
- N_REG_CLASSES elements. */
- VEC_quick_push (int, earlyclobber_regclass, (int) class);
- found_rc:
- ;
- }
-
- amp_p = false;
- class = NO_REGS;
- break;
+ df_rd_simulate_artificial_defs_at_top (bb, &cpy);
- case 'r':
- class = GENERAL_REGS;
- break;
+ /* Process the regular instructions next. */
+ FOR_BB_INSNS (bb, insn)
+ if (INSN_P (insn))
+ {
+ unsigned int uid = INSN_UID (insn);
- default:
- class = REG_CLASS_FROM_CONSTRAINT (c, p);
- break;
- }
- if (c == '\0')
- break;
- p += CONSTRAINT_LEN (c, p);
- }
- }
+ /* First scan the uses and link them up with the defs that remain
+ in the cpy vector. */
+ df_chain_create_bb_process_use (&cpy, DF_INSN_UID_USES (uid), 0);
+ if (df->changeable_flags & DF_EQ_NOTES)
+ df_chain_create_bb_process_use (&cpy, DF_INSN_UID_EQ_USES (uid), 0);
- return found;
-}
+ /* Since we are going forwards, process the defs second. */
+ df_rd_simulate_one_insn (bb, insn, &cpy);
+ }
-/* The function checks that pseudo-register *X has a class
- intersecting with the class of pseudo-register could be early
- clobbered in the same insn.
+ /* Create the chains for the artificial uses of the hard registers
+ at the end of the block. */
+ if (!(df->changeable_flags & DF_NO_HARD_REGS))
+ df_chain_create_bb_process_use (&cpy,
+ df_get_artificial_uses (bb->index),
+ 0);
- This function is a no-op if earlyclobber_regclass is empty.
+ bitmap_clear (&cpy);
+}
- Reload can assign the same hard register to uninitialized
- pseudo-register and early clobbered pseudo-register in an insn if
- the pseudo-register is used first time in given BB and not lived at
- the BB start. To prevent this we don't change life information for
- such pseudo-registers. */
+/* Create def-use chains from reaching use bitmaps for basic blocks
+ in BLOCKS. */
-static int
-df_urec_mark_reg_use_for_earlyclobber (rtx *x, void *data)
+static void
+df_chain_finalize (bitmap all_blocks)
{
- enum reg_class pref_class, alt_class;
- int i, regno;
- struct df_urec_bb_info *bb_info = (struct df_urec_bb_info*) data;
+ unsigned int bb_index;
+ bitmap_iterator bi;
- if (REG_P (*x) && REGNO (*x) >= FIRST_PSEUDO_REGISTER)
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- int rc;
-
- regno = REGNO (*x);
- if (bitmap_bit_p (bb_info->kill, regno)
- || bitmap_bit_p (bb_info->gen, regno))
- return 0;
- pref_class = reg_preferred_class (regno);
- alt_class = reg_alternate_class (regno);
- for (i = 0; VEC_iterate (int, earlyclobber_regclass, i, rc); i++)
- {
- if (reg_classes_intersect_p (rc, pref_class)
- || (rc != NO_REGS
- && reg_classes_intersect_p (rc, alt_class)))
- {
- bitmap_set_bit (bb_info->earlyclobber, regno);
- break;
- }
- }
+ df_chain_create_bb (bb_index);
}
- return 0;
}
-/* The function processes all pseudo-registers in *X with the aid of
- previous function. */
+
+/* Free all storage associated with the problem. */
static void
-df_urec_mark_reg_use_for_earlyclobber_1 (rtx *x, void *data)
+df_chain_free (void)
{
- for_each_rtx (x, df_urec_mark_reg_use_for_earlyclobber, data);
+ free_alloc_pool (df_chain->block_pool);
+ BITMAP_FREE (df_chain->out_of_date_transfer_functions);
+ free (df_chain);
}
-/* Compute local uninitialized register info for basic block BB. */
+/* Debugging info. */
static void
-df_urec_bb_local_compute (struct dataflow *dflow, unsigned int bb_index)
+df_chain_top_dump (basic_block bb, FILE *file)
{
- struct df *df = dflow->df;
- basic_block bb = BASIC_BLOCK (bb_index);
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, bb_index);
- rtx insn;
- struct df_ref *def;
-
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
- {
- unsigned int regno = DF_REF_REGNO (def);
- bitmap_set_bit (bb_info->gen, regno);
- }
-
- FOR_BB_INSNS (bb, insn)
+ if (df_chain_problem_p (DF_DU_CHAIN))
{
- if (INSN_P (insn))
+ rtx insn;
+ df_ref *def_rec = df_get_artificial_defs (bb->index);
+ if (*def_rec)
{
- note_stores (PATTERN (insn), df_urec_mark_reg_change, bb_info);
- if (df_urec_check_earlyclobber (insn))
+
+ fprintf (file, ";; DU chains for artificial defs\n");
+ while (*def_rec)
{
- struct df_urec_problem_data *problem_data
- = (struct df_urec_problem_data *) dflow->problem_data;
- problem_data->earlyclobbers_found = true;
- note_uses (&PATTERN (insn),
- df_urec_mark_reg_use_for_earlyclobber_1, bb_info);
+ df_ref def = *def_rec;
+ fprintf (file, ";; reg %d ", DF_REF_REGNO (def));
+ df_chain_dump (DF_REF_CHAIN (def), file);
+ fprintf (file, "\n");
+ def_rec++;
}
}
- }
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
- {
- unsigned int regno = DF_REF_REGNO (def);
- bitmap_set_bit (bb_info->gen, regno);
- }
+ FOR_BB_INSNS (bb, insn)
+ {
+ if (INSN_P (insn))
+ {
+ struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
+ def_rec = DF_INSN_INFO_DEFS (insn_info);
+ if (*def_rec)
+ {
+ fprintf (file, ";; DU chains for insn luid %d uid %d\n",
+ DF_INSN_INFO_LUID (insn_info), INSN_UID (insn));
+ while (*def_rec)
+ {
+ df_ref def = *def_rec;
+ fprintf (file, ";; reg %d ", DF_REF_REGNO (def));
+ if (DF_REF_FLAGS (def) & DF_REF_READ_WRITE)
+ fprintf (file, "read/write ");
+ df_chain_dump (DF_REF_CHAIN (def), file);
+ fprintf (file, "\n");
+ def_rec++;
+ }
+ }
+ }
+ }
+ }
}
-/* Compute local uninitialized register info. */
-
static void
-df_urec_local_compute (struct dataflow *dflow,
- bitmap all_blocks ATTRIBUTE_UNUSED,
- bitmap rescan_blocks)
+df_chain_bottom_dump (basic_block bb, FILE *file)
{
- unsigned int bb_index;
- bitmap_iterator bi;
-#ifdef STACK_REGS
- int i;
- HARD_REG_SET stack_hard_regs, used;
- struct df_urec_problem_data *problem_data
- = (struct df_urec_problem_data *) dflow->problem_data;
-
- /* Any register that MAY be allocated to a register stack (like the
- 387) is treated poorly. Each such register is marked as being
- live everywhere. This keeps the register allocator and the
- subsequent passes from doing anything useful with these values.
-
- FIXME: This seems like an incredibly poor idea. */
-
- CLEAR_HARD_REG_SET (stack_hard_regs);
- for (i = FIRST_STACK_REG; i <= LAST_STACK_REG; i++)
- SET_HARD_REG_BIT (stack_hard_regs, i);
- problem_data->stack_regs = BITMAP_ALLOC (NULL);
- for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
- {
- COPY_HARD_REG_SET (used, reg_class_contents[reg_preferred_class (i)]);
- IOR_HARD_REG_SET (used, reg_class_contents[reg_alternate_class (i)]);
- AND_HARD_REG_SET (used, stack_hard_regs);
- if (!hard_reg_set_empty_p (used))
- bitmap_set_bit (problem_data->stack_regs, i);
- }
-#endif
-
- /* We know that earlyclobber_regclass holds no more than
- N_REG_CLASSES elements. See df_urec_check_earlyclobber. */
- earlyclobber_regclass = VEC_alloc (int, heap, N_REG_CLASSES);
-
- EXECUTE_IF_SET_IN_BITMAP (rescan_blocks, 0, bb_index, bi)
+ if (df_chain_problem_p (DF_UD_CHAIN))
{
- df_urec_bb_local_compute (dflow, bb_index);
- }
-
- VEC_free (int, heap, earlyclobber_regclass);
-}
-
-
-/* Initialize the solution vectors. */
+ rtx insn;
+ df_ref *use_rec = df_get_artificial_uses (bb->index);
-static void
-df_urec_init (struct dataflow *dflow, bitmap all_blocks)
-{
- unsigned int bb_index;
- bitmap_iterator bi;
+ if (*use_rec)
+ {
+ fprintf (file, ";; UD chains for artificial uses\n");
+ while (*use_rec)
+ {
+ df_ref use = *use_rec;
+ fprintf (file, ";; reg %d ", DF_REF_REGNO (use));
+ df_chain_dump (DF_REF_CHAIN (use), file);
+ fprintf (file, "\n");
+ use_rec++;
+ }
+ }
- EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
- {
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, bb_index);
+ FOR_BB_INSNS (bb, insn)
+ {
+ if (INSN_P (insn))
+ {
+ struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
+ df_ref *eq_use_rec = DF_INSN_INFO_EQ_USES (insn_info);
+ use_rec = DF_INSN_INFO_USES (insn_info);
+ if (*use_rec || *eq_use_rec)
+ {
+ fprintf (file, ";; UD chains for insn luid %d uid %d\n",
+ DF_INSN_INFO_LUID (insn_info), INSN_UID (insn));
- bitmap_copy (bb_info->out, bb_info->gen);
- bitmap_clear (bb_info->in);
+ while (*use_rec)
+ {
+ df_ref use = *use_rec;
+ fprintf (file, ";; reg %d ", DF_REF_REGNO (use));
+ if (DF_REF_FLAGS (use) & DF_REF_READ_WRITE)
+ fprintf (file, "read/write ");
+ df_chain_dump (DF_REF_CHAIN (use), file);
+ fprintf (file, "\n");
+ use_rec++;
+ }
+ while (*eq_use_rec)
+ {
+ df_ref use = *eq_use_rec;
+ fprintf (file, ";; eq_note reg %d ", DF_REF_REGNO (use));
+ df_chain_dump (DF_REF_CHAIN (use), file);
+ fprintf (file, "\n");
+ eq_use_rec++;
+ }
+ }
+ }
+ }
}
}
-/* Or in the stack regs, hard regs and early clobber regs into the
- ur_in sets of all of the blocks. */
-
-static void
-df_urec_local_finalize (struct dataflow *dflow, bitmap all_blocks)
+static struct df_problem problem_CHAIN =
{
- struct df *df = dflow->df;
- struct dataflow *lr_dflow = df->problems_by_index[DF_LR];
- bitmap tmp = BITMAP_ALLOC (NULL);
- bitmap_iterator bi;
- unsigned int bb_index;
- struct df_urec_problem_data *problem_data
- = (struct df_urec_problem_data *) dflow->problem_data;
+ DF_CHAIN, /* Problem id. */
+ DF_NONE, /* Direction. */
+ df_chain_alloc, /* Allocate the problem specific data. */
+ df_chain_reset, /* Reset global information. */
+ NULL, /* Free basic block info. */
+ NULL, /* Local compute function. */
+ NULL, /* Init the solution specific data. */
+ NULL, /* Iterative solver. */
+ NULL, /* Confluence operator 0. */
+ NULL, /* Confluence operator n. */
+ NULL, /* Transfer function. */
+ df_chain_finalize, /* Finalize function. */
+ df_chain_free, /* Free all of the problem information. */
+ df_chain_fully_remove_problem,/* Remove this problem from the stack of dataflow problems. */
+ NULL, /* Debugging. */
+ df_chain_top_dump, /* Debugging start block. */
+ df_chain_bottom_dump, /* Debugging end block. */
+ NULL, /* Incremental solution verify start. */
+ NULL, /* Incremental solution verify end. */
+ &problem_RD, /* Dependent problem. */
+ sizeof (struct df_scan_bb_info),/* Size of entry of block_info array. */
+ TV_DF_CHAIN, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
+};
- EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
- {
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, bb_index);
- struct df_lr_bb_info *bb_lr_info = df_lr_get_bb_info (lr_dflow, bb_index);
- if (bb_index != ENTRY_BLOCK && bb_index != EXIT_BLOCK)
- {
- if (problem_data->earlyclobbers_found)
- bitmap_ior_into (bb_info->in, bb_info->earlyclobber);
-
-#ifdef STACK_REGS
- /* We can not use the same stack register for uninitialized
- pseudo-register and another living pseudo-register
- because if the uninitialized pseudo-register dies,
- subsequent pass reg-stack will be confused (it will
- believe that the other register dies). */
- bitmap_ior_into (bb_info->in, problem_data->stack_regs);
- bitmap_ior_into (bb_info->out, problem_data->stack_regs);
-#endif
- }
+/* Create a new DATAFLOW instance and add it to an existing instance
+ of DF. The returned structure is what is used to get at the
+ solution. */
- /* No register may reach a location where it is not used. Thus
- we trim the rr result to the places where it is used. */
- bitmap_and_into (bb_info->in, bb_lr_info->in);
- bitmap_and_into (bb_info->out, bb_lr_info->out);
-
-#if 1
- /* Hard registers may still stick in the ur_out set, but not
- be in the ur_in set, if their only mention was in a call
- in this block. This is because a call kills in the lr
- problem but does not kill in the rr problem. To clean
- this up, we execute the transfer function on the lr_in
- set and then use that to knock bits out of ur_out. */
- bitmap_ior_and_compl (tmp, bb_info->gen, bb_lr_info->in,
- bb_info->kill);
- bitmap_and_into (bb_info->out, tmp);
-#endif
- }
-
-#ifdef STACK_REGS
- BITMAP_FREE (problem_data->stack_regs);
-#endif
- BITMAP_FREE (tmp);
+void
+df_chain_add_problem (unsigned int chain_flags)
+{
+ df_add_problem (&problem_CHAIN);
+ df_chain->local_flags = chain_flags;
+ df_chain->out_of_date_transfer_functions = BITMAP_ALLOC (NULL);
}
+#undef df_chain_problem_p
-/* Confluence function that ignores fake edges. */
-
-static void
-df_urec_confluence_n (struct dataflow *dflow, edge e)
-{
- bitmap op1 = df_urec_get_bb_info (dflow, e->dest->index)->in;
- bitmap op2 = df_urec_get_bb_info (dflow, e->src->index)->out;
-
- if (e->flags & EDGE_FAKE)
- return;
-
- bitmap_ior_into (op1, op2);
-}
+\f
+/*----------------------------------------------------------------------------
+ WORD LEVEL LIVE REGISTERS
+ Find the locations in the function where any use of a pseudo can
+ reach in the backwards direction. In and out bitvectors are built
+ for each basic block. We only track pseudo registers that have a
+ size of 2 * UNITS_PER_WORD; bitmaps are indexed by 2 * regno and
+ contain two bits corresponding to each of the subwords.
-/* Transfer function. */
+ ----------------------------------------------------------------------------*/
-static bool
-df_urec_transfer_function (struct dataflow *dflow, int bb_index)
+/* Private data used to verify the solution for this problem. */
+struct df_word_lr_problem_data
{
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, bb_index);
- bitmap in = bb_info->in;
- bitmap out = bb_info->out;
- bitmap gen = bb_info->gen;
- bitmap kill = bb_info->kill;
-
- return bitmap_ior_and_compl (out, gen, in, kill);
-}
+ /* An obstack for the bitmaps we need for this problem. */
+ bitmap_obstack word_lr_bitmaps;
+};
-/* Free all storage associated with the problem. */
+/* Free basic block info. */
static void
-df_urec_free (struct dataflow *dflow)
+df_word_lr_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
+ void *vbb_info)
{
- if (dflow->block_info)
+ struct df_word_lr_bb_info *bb_info = (struct df_word_lr_bb_info *) vbb_info;
+ if (bb_info)
{
- unsigned int i;
-
- for (i = 0; i < dflow->block_info_size; i++)
- {
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, i);
- if (bb_info)
- {
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- BITMAP_FREE (bb_info->earlyclobber);
- }
- }
-
- free_alloc_pool (dflow->block_pool);
-
- dflow->block_info_size = 0;
- free (dflow->block_info);
- free (dflow->problem_data);
+ bitmap_clear (&bb_info->use);
+ bitmap_clear (&bb_info->def);
+ bitmap_clear (&bb_info->in);
+ bitmap_clear (&bb_info->out);
}
- free (dflow);
}
-/* Debugging info. */
+/* Allocate or reset bitmaps for DF_WORD_LR blocks. The solution bits are
+ not touched unless the block is new. */
static void
-df_urec_dump (struct dataflow *dflow, FILE *file)
+df_word_lr_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
+ unsigned int bb_index;
+ bitmap_iterator bi;
basic_block bb;
-
- if (!dflow->block_info)
- return;
-
- fprintf (file, "Undefined regs:\n");
-
- FOR_ALL_BB (bb)
- {
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, bb->index);
- df_print_bb_index (bb, file);
-
- if (!bb_info->in)
- continue;
-
- fprintf (file, " in \t");
- dump_bitmap (file, bb_info->in);
- fprintf (file, " gen \t");
- dump_bitmap (file, bb_info->gen);
- fprintf (file, " kill\t");
- dump_bitmap (file, bb_info->kill);
- fprintf (file, " ec\t");
- dump_bitmap (file, bb_info->earlyclobber);
- fprintf (file, " out \t");
- dump_bitmap (file, bb_info->out);
- }
-}
-
-/* All of the information associated with every instance of the problem. */
-
-static struct df_problem problem_UREC =
-{
- DF_UREC, /* Problem id. */
- DF_FORWARD, /* Direction. */
- df_urec_alloc, /* Allocate the problem specific data. */
- NULL, /* Reset global information. */
- df_urec_free_bb_info, /* Free basic block info. */
- df_urec_local_compute, /* Local compute function. */
- df_urec_init, /* Init the solution specific data. */
- df_iterative_dataflow, /* Iterative solver. */
- NULL, /* Confluence operator 0. */
- df_urec_confluence_n, /* Confluence operator n. */
- df_urec_transfer_function, /* Transfer function. */
- df_urec_local_finalize, /* Finalize function. */
- df_urec_free, /* Free all of the problem information. */
- df_urec_dump, /* Debugging. */
- df_lr_add_problem, /* Dependent problem. */
- 0 /* Changeable flags. */
-};
-
-
-/* Create a new DATAFLOW instance and add it to an existing instance
- of DF. The returned structure is what is used to get at the
- solution. */
-
-struct dataflow *
-df_urec_add_problem (struct df *df, int flags)
-{
- return df_add_problem (df, &problem_UREC, flags);
-}
-
-
-\f
-/*----------------------------------------------------------------------------
- CREATE DEF_USE (DU) and / or USE_DEF (UD) CHAINS
-
- Link either the defs to the uses and / or the uses to the defs.
+ struct df_word_lr_problem_data *problem_data
+ = XNEW (struct df_word_lr_problem_data);
- These problems are set up like the other dataflow problems so that
- they nicely fit into the framework. They are much simpler and only
- involve a single traversal of instructions and an examination of
- the reaching defs information (the dependent problem).
-----------------------------------------------------------------------------*/
+ df_word_lr->problem_data = problem_data;
-/* Create def-use or use-def chains. */
+ df_grow_bb_info (df_word_lr);
-static void
-df_chain_alloc (struct dataflow *dflow,
- bitmap blocks_to_rescan ATTRIBUTE_UNUSED,
- bitmap all_blocks ATTRIBUTE_UNUSED)
+ /* Create the mapping from regnos to slots. This does not change
+ unless the problem is destroyed and recreated. In particular, if
+ we end up deleting the only insn that used a subreg, we do not
+ want to redo the mapping because this would invalidate everything
+ else. */
-{
- struct df *df = dflow->df;
- unsigned int i;
+ bitmap_obstack_initialize (&problem_data->word_lr_bitmaps);
- /* Wholesale destruction of the old chains. */
- if (dflow->block_pool)
- free_alloc_pool (dflow->block_pool);
+ FOR_EACH_BB (bb)
+ bitmap_set_bit (df_word_lr->out_of_date_transfer_functions, bb->index);
- dflow->block_pool = create_alloc_pool ("df_chain_chain_block pool",
- sizeof (struct df_link), 100);
+ bitmap_set_bit (df_word_lr->out_of_date_transfer_functions, ENTRY_BLOCK);
+ bitmap_set_bit (df_word_lr->out_of_date_transfer_functions, EXIT_BLOCK);
- if (dflow->flags & DF_DU_CHAIN)
+ EXECUTE_IF_SET_IN_BITMAP (df_word_lr->out_of_date_transfer_functions, 0, bb_index, bi)
{
- df_reorganize_refs (&df->def_info);
+ struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb_index);
- /* Clear out the pointers from the refs. */
- for (i = 0; i < DF_DEFS_SIZE (df); i++)
+ /* When bitmaps are already initialized, just clear them. */
+ if (bb_info->use.obstack)
{
- struct df_ref *ref = df->def_info.refs[i];
- DF_REF_CHAIN (ref) = NULL;
+ bitmap_clear (&bb_info->def);
+ bitmap_clear (&bb_info->use);
}
- }
-
- if (dflow->flags & DF_UD_CHAIN)
- {
- df_reorganize_refs (&df->use_info);
- for (i = 0; i < DF_USES_SIZE (df); i++)
+ else
{
- struct df_ref *ref = df->use_info.refs[i];
- DF_REF_CHAIN (ref) = NULL;
+ bitmap_initialize (&bb_info->use, &problem_data->word_lr_bitmaps);
+ bitmap_initialize (&bb_info->def, &problem_data->word_lr_bitmaps);
+ bitmap_initialize (&bb_info->in, &problem_data->word_lr_bitmaps);
+ bitmap_initialize (&bb_info->out, &problem_data->word_lr_bitmaps);
}
}
+
+ df_word_lr->optional_p = true;
}
-/* Reset all def_use and use_def chains in INSN. */
+/* Reset the global solution for recalculation. */
-static void
-df_chain_insn_reset (struct dataflow *dflow, rtx insn)
+static void
+df_word_lr_reset (bitmap all_blocks)
{
- struct df *df = dflow->df;
- unsigned int uid = INSN_UID (insn);
- struct df_insn_info *insn_info = NULL;
- struct df_ref *ref;
-
- if (uid < df->insns_size)
- insn_info = DF_INSN_UID_GET (df, uid);
+ unsigned int bb_index;
+ bitmap_iterator bi;
- if (insn_info)
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- if (dflow->flags & DF_DU_CHAIN)
- {
- ref = insn_info->defs;
- while (ref)
- {
- ref->chain = NULL;
- ref = ref->next_ref;
- }
- }
-
- if (dflow->flags & DF_UD_CHAIN)
- {
- ref = insn_info->uses;
- while (ref)
- {
- ref->chain = NULL;
- ref = ref->next_ref;
- }
- }
+ struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb_index);
+ gcc_assert (bb_info);
+ bitmap_clear (&bb_info->in);
+ bitmap_clear (&bb_info->out);
}
}
+/* Examine REF, and if it is for a reg we're interested in, set or
+ clear the bits corresponding to its subwords from the bitmap
+ according to IS_SET. LIVE is the bitmap we should update. We do
+ not track hard regs or pseudos of any size other than 2 *
+ UNITS_PER_WORD.
+ We return true if we changed the bitmap, or if we encountered a register
+ we're not tracking. */
-/* Reset all def_use and use_def chains in basic block. */
-
-static void
-df_chain_bb_reset (struct dataflow *dflow, unsigned int bb_index)
+bool
+df_word_lr_mark_ref (df_ref ref, bool is_set, regset live)
{
- struct df *df = dflow->df;
- rtx insn;
- basic_block bb = BASIC_BLOCK (bb_index);
+ rtx orig_reg = DF_REF_REG (ref);
+ rtx reg = orig_reg;
+ enum machine_mode reg_mode;
+ unsigned regno;
+ /* Left at -1 for whole accesses. */
+ int which_subword = -1;
+ bool changed = false;
- /* Some one deleted the basic block out from under us. */
- if (!bb)
- return;
+ if (GET_CODE (reg) == SUBREG)
+ reg = SUBREG_REG (orig_reg);
+ regno = REGNO (reg);
+ reg_mode = GET_MODE (reg);
+ if (regno < FIRST_PSEUDO_REGISTER
+ || GET_MODE_SIZE (reg_mode) != 2 * UNITS_PER_WORD)
+ return true;
- FOR_BB_INSNS (bb, insn)
+ if (GET_CODE (orig_reg) == SUBREG
+ && df_read_modify_subreg_p (orig_reg))
{
- if (INSN_P (insn))
- {
- /* Record defs within INSN. */
- df_chain_insn_reset (dflow, insn);
- }
+ gcc_assert (DF_REF_FLAGS_IS_SET (ref, DF_REF_PARTIAL));
+ if (subreg_lowpart_p (orig_reg))
+ which_subword = 0;
+ else
+ which_subword = 1;
}
-
- /* Get rid of any chains in artificial uses or defs. */
- if (dflow->flags & DF_DU_CHAIN)
+ if (is_set)
{
- struct df_ref *def;
- def = df_get_artificial_defs (df, bb_index);
- while (def)
- {
- def->chain = NULL;
- def = def->next_ref;
- }
+ if (which_subword != 1)
+ changed |= bitmap_set_bit (live, regno * 2);
+ if (which_subword != 0)
+ changed |= bitmap_set_bit (live, regno * 2 + 1);
}
-
- if (dflow->flags & DF_UD_CHAIN)
+ else
{
- struct df_ref *use;
- use = df_get_artificial_uses (df, bb_index);
- while (use)
- {
- use->chain = NULL;
- use = use->next_ref;
- }
+ if (which_subword != 1)
+ changed |= bitmap_clear_bit (live, regno * 2);
+ if (which_subword != 0)
+ changed |= bitmap_clear_bit (live, regno * 2 + 1);
}
+ return changed;
}
-
-/* Reset all of the chains when the set of basic blocks changes. */
-
+/* Compute local live register info for basic block BB. */
static void
-df_chain_reset (struct dataflow *dflow, bitmap blocks_to_clear)
+df_word_lr_bb_local_compute (unsigned int bb_index)
{
- bitmap_iterator bi;
- unsigned int bb_index;
-
- EXECUTE_IF_SET_IN_BITMAP (blocks_to_clear, 0, bb_index, bi)
+ basic_block bb = BASIC_BLOCK (bb_index);
+ struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb_index);
+ rtx insn;
+ df_ref *def_rec;
+ df_ref *use_rec;
+
+ /* Ensure that artificial refs don't contain references to pseudos. */
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
- df_chain_bb_reset (dflow, bb_index);
+ df_ref def = *def_rec;
+ gcc_assert (DF_REF_REGNO (def) < FIRST_PSEUDO_REGISTER);
}
- free_alloc_pool (dflow->block_pool);
- dflow->block_pool = NULL;
-}
-
-
-/* Create the chains for a list of USEs. */
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ df_ref use = *use_rec;
+ gcc_assert (DF_REF_REGNO (use) < FIRST_PSEUDO_REGISTER);
+ }
-static void
-df_chain_create_bb_process_use (struct dataflow *dflow,
- bitmap local_rd,
- struct df_ref *use,
- enum df_ref_flags top_flag)
-{
- struct df *df = dflow->df;
- bitmap_iterator bi;
- unsigned int def_index;
-
- while (use)
+ FOR_BB_INSNS_REVERSE (bb, insn)
{
- /* Do not want to go through this for an uninitialized var. */
- unsigned int uregno = DF_REF_REGNO (use);
- int count = DF_REG_DEF_GET (df, uregno)->n_refs;
- if (count)
+ unsigned int uid = INSN_UID (insn);
+
+ if (!NONDEBUG_INSN_P (insn))
+ continue;
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
{
- if (top_flag == (DF_REF_FLAGS (use) & DF_REF_AT_TOP))
+ df_ref def = *def_rec;
+ /* If the def is to only part of the reg, it does
+ not kill the other defs that reach here. */
+ if (!(DF_REF_FLAGS (def) & (DF_REF_CONDITIONAL)))
{
- unsigned int first_index = DF_REG_DEF_GET (df, uregno)->begin;
- unsigned int last_index = first_index + count - 1;
-
- EXECUTE_IF_SET_IN_BITMAP (local_rd, first_index, def_index, bi)
- {
- struct df_ref *def;
- if (def_index > last_index)
- break;
-
- def = DF_DEFS_GET (df, def_index);
- if (dflow->flags & DF_DU_CHAIN)
- df_chain_create (dflow, def, use);
- if (dflow->flags & DF_UD_CHAIN)
- df_chain_create (dflow, use, def);
- }
+ df_word_lr_mark_ref (def, true, &bb_info->def);
+ df_word_lr_mark_ref (def, false, &bb_info->use);
}
}
- use = use->next_ref;
+ for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
+ {
+ df_ref use = *use_rec;
+ df_word_lr_mark_ref (use, true, &bb_info->use);
+ }
}
}
-/* Reset the storage pool that the def-use or use-def chains have been
- allocated in. We do not need to re adjust the pointers in the refs,
- these have already been clean out.*/
-/* Create chains from reaching defs bitmaps for basic block BB. */
+/* Compute local live register info for each basic block within BLOCKS. */
+
static void
-df_chain_create_bb (struct dataflow *dflow,
- struct dataflow *rd_dflow,
- unsigned int bb_index)
+df_word_lr_local_compute (bitmap all_blocks ATTRIBUTE_UNUSED)
{
- basic_block bb = BASIC_BLOCK (bb_index);
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (rd_dflow, bb_index);
- rtx insn;
- bitmap cpy = BITMAP_ALLOC (NULL);
- struct df *df = dflow->df;
- struct df_ref *def;
-
- bitmap_copy (cpy, bb_info->in);
-
- /* Since we are going forwards, process the artificial uses first
- then the artificial defs second. */
-
-#ifdef EH_USES
- /* Create the chains for the artificial uses from the EH_USES at the
- beginning of the block. */
- df_chain_create_bb_process_use (dflow, cpy,
- df_get_artificial_uses (df, bb->index),
- DF_REF_AT_TOP);
-#endif
+ unsigned int bb_index;
+ bitmap_iterator bi;
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
- {
- unsigned int dregno = DF_REF_REGNO (def);
- if (!(DF_REF_FLAGS (def) & DF_REF_PARTIAL))
- bitmap_clear_range (cpy,
- DF_REG_DEF_GET (df, dregno)->begin,
- DF_REG_DEF_GET (df, dregno)->n_refs);
- bitmap_set_bit (cpy, DF_REF_ID (def));
- }
-
- /* Process the regular instructions next. */
- FOR_BB_INSNS (bb, insn)
+ EXECUTE_IF_SET_IN_BITMAP (df_word_lr->out_of_date_transfer_functions, 0, bb_index, bi)
{
- struct df_ref *def;
- unsigned int uid = INSN_UID (insn);
-
- if (!INSN_P (insn))
- continue;
-
- /* Now scan the uses and link them up with the defs that remain
- in the cpy vector. */
-
- df_chain_create_bb_process_use (dflow, cpy,
- DF_INSN_UID_USES (df, uid), 0);
-
- /* Since we are going forwards, process the defs second. This
- pass only changes the bits in cpy. */
- for (def = DF_INSN_UID_DEFS (df, uid); def; def = def->next_ref)
+ if (bb_index == EXIT_BLOCK)
{
- unsigned int dregno = DF_REF_REGNO (def);
- if (!(DF_REF_FLAGS (def) & DF_REF_PARTIAL))
- bitmap_clear_range (cpy,
- DF_REG_DEF_GET (df, dregno)->begin,
- DF_REG_DEF_GET (df, dregno)->n_refs);
- if (!(DF_REF_FLAGS (def)
- & (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER)))
- bitmap_set_bit (cpy, DF_REF_ID (def));
+ unsigned regno;
+ bitmap_iterator bi;
+ EXECUTE_IF_SET_IN_BITMAP (df->exit_block_uses, FIRST_PSEUDO_REGISTER,
+ regno, bi)
+ gcc_unreachable ();
}
+ else
+ df_word_lr_bb_local_compute (bb_index);
}
- /* Create the chains for the artificial uses of the hard registers
- at the end of the block. */
- df_chain_create_bb_process_use (dflow, cpy,
- df_get_artificial_uses (df, bb->index), 0);
+ bitmap_clear (df_word_lr->out_of_date_transfer_functions);
}
-/* Create def-use chains from reaching use bitmaps for basic blocks
- in BLOCKS. */
+
+/* Initialize the solution vectors. */
static void
-df_chain_finalize (struct dataflow *dflow, bitmap all_blocks)
+df_word_lr_init (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
- struct df *df = dflow->df;
- struct dataflow *rd_dflow = df->problems_by_index [DF_RD];
-
+
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- df_chain_create_bb (dflow, rd_dflow, bb_index);
+ struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb_index);
+ bitmap_copy (&bb_info->in, &bb_info->use);
+ bitmap_clear (&bb_info->out);
}
}
-/* Free all storage associated with the problem. */
+/* Confluence function that ignores fake edges. */
-static void
-df_chain_free (struct dataflow *dflow)
+static bool
+df_word_lr_confluence_n (edge e)
{
- free_alloc_pool (dflow->block_pool);
- free (dflow);
+ bitmap op1 = &df_word_lr_get_bb_info (e->src->index)->out;
+ bitmap op2 = &df_word_lr_get_bb_info (e->dest->index)->in;
+
+ return bitmap_ior_into (op1, op2);
}
-/* Debugging info. */
+/* Transfer function. */
+
+static bool
+df_word_lr_transfer_function (int bb_index)
+{
+ struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb_index);
+ bitmap in = &bb_info->in;
+ bitmap out = &bb_info->out;
+ bitmap use = &bb_info->use;
+ bitmap def = &bb_info->def;
+
+ return bitmap_ior_and_compl (in, use, out, def);
+}
+
+
+/* Free all storage associated with the problem. */
static void
-df_chains_dump (struct dataflow *dflow, FILE *file)
+df_word_lr_free (void)
{
- struct df *df = dflow->df;
- unsigned int j;
+ struct df_word_lr_problem_data *problem_data
+ = (struct df_word_lr_problem_data *)df_word_lr->problem_data;
- if (dflow->flags & DF_DU_CHAIN)
+ if (df_word_lr->block_info)
{
- fprintf (file, "Def-use chains:\n");
- for (j = 0; j < df->def_info.bitmap_size; j++)
- {
- struct df_ref *def = DF_DEFS_GET (df, j);
- if (def)
- {
- fprintf (file, "d%d bb %d luid %d insn %d reg %d ",
- j, DF_REF_BBNO (def),
- DF_REF_INSN (def) ?
- DF_INSN_LUID (df, DF_REF_INSN (def)):
- -1,
- DF_REF_INSN (def) ? DF_REF_INSN_UID (def) : -1,
- DF_REF_REGNO (def));
- if (def->flags & DF_REF_READ_WRITE)
- fprintf (file, "read/write ");
- df_chain_dump (DF_REF_CHAIN (def), file);
- fprintf (file, "\n");
- }
- }
+ df_word_lr->block_info_size = 0;
+ free (df_word_lr->block_info);
+ df_word_lr->block_info = NULL;
}
- if (dflow->flags & DF_UD_CHAIN)
- {
- fprintf (file, "Use-def chains:\n");
- for (j = 0; j < df->use_info.bitmap_size; j++)
- {
- struct df_ref *use = DF_USES_GET (df, j);
- if (use)
- {
- fprintf (file, "u%d bb %d luid %d insn %d reg %d ",
- j, DF_REF_BBNO (use),
- DF_REF_INSN (use) ?
- DF_INSN_LUID (df, DF_REF_INSN (use))
- : -1,
- DF_REF_INSN (DF_USES_GET (df, j)) ?
- DF_REF_INSN_UID (DF_USES_GET (df,j))
- : -1,
- DF_REF_REGNO (use));
- if (use->flags & DF_REF_READ_WRITE)
- fprintf (file, "read/write ");
- if (use->flags & DF_REF_STRIPPED)
- fprintf (file, "stripped ");
- if (use->flags & DF_REF_IN_NOTE)
- fprintf (file, "note ");
- df_chain_dump (DF_REF_CHAIN (use), file);
- fprintf (file, "\n");
- }
- }
- }
+ BITMAP_FREE (df_word_lr->out_of_date_transfer_functions);
+ bitmap_obstack_release (&problem_data->word_lr_bitmaps);
+ free (problem_data);
+ free (df_word_lr);
}
-static struct df_problem problem_CHAIN =
+/* Debugging info at top of bb. */
+
+static void
+df_word_lr_top_dump (basic_block bb, FILE *file)
{
- DF_CHAIN, /* Problem id. */
- DF_NONE, /* Direction. */
- df_chain_alloc, /* Allocate the problem specific data. */
- df_chain_reset, /* Reset global information. */
- NULL, /* Free basic block info. */
- NULL, /* Local compute function. */
- NULL, /* Init the solution specific data. */
- NULL, /* Iterative solver. */
- NULL, /* Confluence operator 0. */
- NULL, /* Confluence operator n. */
- NULL, /* Transfer function. */
- df_chain_finalize, /* Finalize function. */
- df_chain_free, /* Free all of the problem information. */
- df_chains_dump, /* Debugging. */
- df_rd_add_problem, /* Dependent problem. */
- 0 /* Changeable flags. */
+ struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb->index);
+ if (!bb_info)
+ return;
+
+ fprintf (file, ";; blr in \t");
+ df_print_word_regset (file, &bb_info->in);
+ fprintf (file, ";; blr use \t");
+ df_print_word_regset (file, &bb_info->use);
+ fprintf (file, ";; blr def \t");
+ df_print_word_regset (file, &bb_info->def);
+}
+
+
+/* Debugging info at bottom of bb. */
+
+static void
+df_word_lr_bottom_dump (basic_block bb, FILE *file)
+{
+ struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb->index);
+ if (!bb_info)
+ return;
+
+ fprintf (file, ";; blr out \t");
+ df_print_word_regset (file, &bb_info->out);
+}
+
+
+/* All of the information associated with every instance of the problem. */
+
+static struct df_problem problem_WORD_LR =
+{
+ DF_WORD_LR, /* Problem id. */
+ DF_BACKWARD, /* Direction. */
+ df_word_lr_alloc, /* Allocate the problem specific data. */
+ df_word_lr_reset, /* Reset global information. */
+ df_word_lr_free_bb_info, /* Free basic block info. */
+ df_word_lr_local_compute, /* Local compute function. */
+ df_word_lr_init, /* Init the solution specific data. */
+ df_worklist_dataflow, /* Worklist solver. */
+ NULL, /* Confluence operator 0. */
+ df_word_lr_confluence_n, /* Confluence operator n. */
+ df_word_lr_transfer_function, /* Transfer function. */
+ NULL, /* Finalize function. */
+ df_word_lr_free, /* Free all of the problem information. */
+ df_word_lr_free, /* Remove this problem from the stack of dataflow problems. */
+ NULL, /* Debugging. */
+ df_word_lr_top_dump, /* Debugging start block. */
+ df_word_lr_bottom_dump, /* Debugging end block. */
+ NULL, /* Incremental solution verify start. */
+ NULL, /* Incremental solution verify end. */
+ NULL, /* Dependent problem. */
+ sizeof (struct df_word_lr_bb_info),/* Size of entry of block_info array. */
+ TV_DF_WORD_LR, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
};
of DF. The returned structure is what is used to get at the
solution. */
-struct dataflow *
-df_chain_add_problem (struct df *df, int flags)
+void
+df_word_lr_add_problem (void)
{
- return df_add_problem (df, &problem_CHAIN, flags);
+ df_add_problem (&problem_WORD_LR);
+ /* These will be initialized when df_scan_blocks processes each
+ block. */
+ df_word_lr->out_of_date_transfer_functions = BITMAP_ALLOC (NULL);
}
-/*----------------------------------------------------------------------------
- REGISTER INFORMATION
+/* Simulate the effects of the defs of INSN on LIVE. Return true if we changed
+ any bits, which is used by the caller to determine whether a set is
+ necessary. We also return true if there are other reasons not to delete
+ an insn. */
+
+bool
+df_word_lr_simulate_defs (rtx insn, bitmap live)
+{
+ bool changed = false;
+ df_ref *def_rec;
+ unsigned int uid = INSN_UID (insn);
- This pass properly computes REG_DEAD and REG_UNUSED notes.
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ if (DF_REF_FLAGS (def) & DF_REF_CONDITIONAL)
+ changed = true;
+ else
+ changed |= df_word_lr_mark_ref (*def_rec, false, live);
+ }
+ return changed;
+}
- If the DF_RI_LIFE flag is set the following vectors containing
- information about register usage are properly set: REG_N_REFS,
- REG_N_DEATHS, REG_N_SETS, REG_LIVE_LENGTH, REG_N_CALLS_CROSSED,
- REG_N_THROWING_CALLS_CROSSED and REG_BASIC_BLOCK.
- ----------------------------------------------------------------------------*/
+/* Simulate the effects of the uses of INSN on LIVE. */
-#ifdef REG_DEAD_DEBUGGING
-static void
-print_note (char *prefix, rtx insn, rtx note)
+void
+df_word_lr_simulate_uses (rtx insn, bitmap live)
{
- fprintf (stderr, "%s %d ", prefix, INSN_UID (insn));
- print_rtl (stderr, note);
- fprintf (stderr, "\n");
-}
-#endif
+ df_ref *use_rec;
+ unsigned int uid = INSN_UID (insn);
-/* Allocate the lifetime information. */
+ for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
+ df_word_lr_mark_ref (*use_rec, true, live);
+}
+\f
+/*----------------------------------------------------------------------------
+ This problem computes REG_DEAD and REG_UNUSED notes.
+ ----------------------------------------------------------------------------*/
-static void
-df_ri_alloc (struct dataflow *dflow,
- bitmap blocks_to_rescan ATTRIBUTE_UNUSED,
- bitmap all_blocks ATTRIBUTE_UNUSED)
+static void
+df_note_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
- int i;
- struct df *df = dflow->df;
+ df_note->optional_p = true;
+}
- if (dflow->flags & DF_RI_LIFE)
+#ifdef REG_DEAD_DEBUGGING
+static void
+df_print_note (const char *prefix, rtx insn, rtx note)
+{
+ if (dump_file)
{
- max_regno = max_reg_num ();
- allocate_reg_info (max_regno, FALSE, FALSE);
-
- /* Reset all the data we'll collect. */
- for (i = 0; i < max_regno; i++)
- {
- REG_N_SETS (i) = DF_REG_DEF_COUNT (df, i);
- REG_N_REFS (i) = DF_REG_USE_COUNT (df, i) + REG_N_SETS (i);
- REG_N_DEATHS (i) = 0;
- REG_N_CALLS_CROSSED (i) = 0;
- REG_N_THROWING_CALLS_CROSSED (i) = 0;
- REG_LIVE_LENGTH (i) = 0;
- REG_FREQ (i) = 0;
- REG_BASIC_BLOCK (i) = REG_BLOCK_UNKNOWN;
- }
+ fprintf (dump_file, "%s %d ", prefix, INSN_UID (insn));
+ print_rtl (dump_file, note);
+ fprintf (dump_file, "\n");
}
}
+#endif
/* After reg-stack, the x86 floating point stack regs are difficult to
analyze because of all of the pushes, pops and rotations. Thus, we
just leave the notes alone. */
-static inline bool
-df_ignore_stack_reg (int regno ATTRIBUTE_UNUSED)
-{
#ifdef STACK_REGS
- return (regstack_completed
- && IN_RANGE (regno, FIRST_STACK_REG, LAST_STACK_REG));
+static inline bool
+df_ignore_stack_reg (int regno)
+{
+ return regstack_completed
+ && IN_RANGE (regno, FIRST_STACK_REG, LAST_STACK_REG);
+}
#else
+static inline bool
+df_ignore_stack_reg (int regno ATTRIBUTE_UNUSED)
+{
return false;
-#endif
}
+#endif
-/* Remove all of the REG_DEAD or REG_UNUSED notes from INSN. */
+/* Remove all of the REG_DEAD or REG_UNUSED notes from INSN and add
+ them to OLD_DEAD_NOTES and OLD_UNUSED_NOTES. Remove also
+ REG_EQUAL/REG_EQUIV notes referring to dead pseudos using LIVE
+ as the bitmap of currently live registers. */
static void
-df_kill_notes (rtx insn, int flags)
+df_kill_notes (rtx insn, bitmap live)
{
rtx *pprev = ®_NOTES (insn);
rtx link = *pprev;
-
+
while (link)
{
switch (REG_NOTE_KIND (link))
{
case REG_DEAD:
- if (flags & DF_RI_LIFE)
- if (df_ignore_stack_reg (REGNO (XEXP (link, 0))))
- REG_N_DEATHS (REGNO (XEXP (link, 0)))++;
+ /* After reg-stack, we need to ignore any unused notes
+ for the stack registers. */
+ if (df_ignore_stack_reg (REGNO (XEXP (link, 0))))
+ {
+ pprev = &XEXP (link, 1);
+ link = *pprev;
+ }
+ else
+ {
+ rtx next = XEXP (link, 1);
+#ifdef REG_DEAD_DEBUGGING
+ df_print_note ("deleting: ", insn, link);
+#endif
+ free_EXPR_LIST_node (link);
+ *pprev = link = next;
+ }
+ break;
- /* Fallthru */
case REG_UNUSED:
- if (!df_ignore_stack_reg (REGNO (XEXP (link, 0))))
+ /* After reg-stack, we need to ignore any unused notes
+ for the stack registers. */
+ if (df_ignore_stack_reg (REGNO (XEXP (link, 0))))
+ {
+ pprev = &XEXP (link, 1);
+ link = *pprev;
+ }
+ else
{
rtx next = XEXP (link, 1);
#ifdef REG_DEAD_DEBUGGING
- print_note ("deleting: ", insn, link);
+ df_print_note ("deleting: ", insn, link);
#endif
free_EXPR_LIST_node (link);
*pprev = link = next;
}
break;
-
+
+ case REG_EQUAL:
+ case REG_EQUIV:
+ {
+ /* Remove the notes that refer to dead registers. As we have at most
+ one REG_EQUAL/EQUIV note, all of EQ_USES will refer to this note
+ so we need to purge the complete EQ_USES vector when removing
+ the note using df_notes_rescan. */
+ df_ref *use_rec;
+ bool deleted = false;
+
+ for (use_rec = DF_INSN_EQ_USES (insn); *use_rec; use_rec++)
+ {
+ df_ref use = *use_rec;
+ if (DF_REF_REGNO (use) > FIRST_PSEUDO_REGISTER
+ && DF_REF_LOC (use)
+ && (DF_REF_FLAGS (use) & DF_REF_IN_NOTE)
+ && ! bitmap_bit_p (live, DF_REF_REGNO (use))
+ && loc_mentioned_in_p (DF_REF_LOC (use), XEXP (link, 0)))
+ {
+ deleted = true;
+ break;
+ }
+ }
+ if (deleted)
+ {
+ rtx next;
+#ifdef REG_DEAD_DEBUGGING
+ df_print_note ("deleting: ", insn, link);
+#endif
+ next = XEXP (link, 1);
+ free_EXPR_LIST_node (link);
+ *pprev = link = next;
+ df_notes_rescan (insn);
+ }
+ else
+ {
+ pprev = &XEXP (link, 1);
+ link = *pprev;
+ }
+ break;
+ }
default:
pprev = &XEXP (link, 1);
link = *pprev;
}
+/* Set a NOTE_TYPE note for REG in INSN. */
+
+static inline void
+df_set_note (enum reg_note note_type, rtx insn, rtx reg)
+{
+ gcc_checking_assert (!DEBUG_INSN_P (insn));
+ add_reg_note (insn, note_type, reg);
+}
+
+/* A subroutine of df_set_unused_notes_for_mw, with a selection of its
+ arguments. Return true if the register value described by MWS's
+ mw_reg is known to be completely unused, and if mw_reg can therefore
+ be used in a REG_UNUSED note. */
+
+static bool
+df_whole_mw_reg_unused_p (struct df_mw_hardreg *mws,
+ bitmap live, bitmap artificial_uses)
+{
+ unsigned int r;
+
+ /* If MWS describes a partial reference, create REG_UNUSED notes for
+ individual hard registers. */
+ if (mws->flags & DF_REF_PARTIAL)
+ return false;
+
+ /* Likewise if some part of the register is used. */
+ for (r = mws->start_regno; r <= mws->end_regno; r++)
+ if (bitmap_bit_p (live, r)
+ || bitmap_bit_p (artificial_uses, r))
+ return false;
+
+ gcc_assert (REG_P (mws->mw_reg));
+ return true;
+}
+
+
/* Set the REG_UNUSED notes for the multiword hardreg defs in INSN
based on the bits in LIVE. Do not generate notes for registers in
artificial uses. DO_NOT_GEN is updated so that REG_DEAD notes are
static void
df_set_unused_notes_for_mw (rtx insn, struct df_mw_hardreg *mws,
- bitmap live, bitmap do_not_gen,
- bitmap artificial_uses, int flags)
+ bitmap live, bitmap do_not_gen,
+ bitmap artificial_uses,
+ struct dead_debug *debug)
{
- bool all_dead = true;
- struct df_link *regs = mws->regs;
- unsigned int regno = DF_REF_REGNO (regs->ref);
-
+ unsigned int r;
+
#ifdef REG_DEAD_DEBUGGING
- fprintf (stderr, "mw unused looking at %d\n", DF_REF_REGNO (regs->ref));
- df_ref_debug (regs->ref, stderr);
+ if (dump_file)
+ fprintf (dump_file, "mw_set_unused looking at mws[%d..%d]\n",
+ mws->start_regno, mws->end_regno);
#endif
- while (regs)
- {
- unsigned int regno = DF_REF_REGNO (regs->ref);
- if ((bitmap_bit_p (live, regno))
- || bitmap_bit_p (artificial_uses, regno))
- {
- all_dead = false;
- break;
- }
- regs = regs->next;
- }
-
- if (all_dead)
+
+ if (df_whole_mw_reg_unused_p (mws, live, artificial_uses))
{
- struct df_link *regs = mws->regs;
- rtx note = alloc_EXPR_LIST (REG_UNUSED, *DF_REF_LOC (regs->ref),
- REG_NOTES (insn));
- REG_NOTES (insn) = note;
+ unsigned int regno = mws->start_regno;
+ df_set_note (REG_UNUSED, insn, mws->mw_reg);
+ dead_debug_insert_temp (debug, regno, insn, DEBUG_TEMP_AFTER_WITH_REG);
+
#ifdef REG_DEAD_DEBUGGING
- print_note ("adding 1: ", insn, note);
+ df_print_note ("adding 1: ", insn, REG_NOTES (insn));
#endif
bitmap_set_bit (do_not_gen, regno);
/* Only do this if the value is totally dead. */
- if (flags & DF_RI_LIFE)
- {
- REG_N_DEATHS (regno) ++;
- REG_LIVE_LENGTH (regno)++;
- }
}
else
- {
- struct df_link *regs = mws->regs;
- while (regs)
- {
- struct df_ref *ref = regs->ref;
-
- regno = DF_REF_REGNO (ref);
- if ((!bitmap_bit_p (live, regno))
- && (!bitmap_bit_p (artificial_uses, regno)))
- {
- rtx note = alloc_EXPR_LIST (REG_UNUSED, regno_reg_rtx[regno],
- REG_NOTES (insn));
- REG_NOTES (insn) = note;
+ for (r = mws->start_regno; r <= mws->end_regno; r++)
+ {
+ if (!bitmap_bit_p (live, r)
+ && !bitmap_bit_p (artificial_uses, r))
+ {
+ df_set_note (REG_UNUSED, insn, regno_reg_rtx[r]);
+ dead_debug_insert_temp (debug, r, insn, DEBUG_TEMP_AFTER_WITH_REG);
#ifdef REG_DEAD_DEBUGGING
- print_note ("adding 2: ", insn, note);
+ df_print_note ("adding 2: ", insn, REG_NOTES (insn));
#endif
- }
- bitmap_set_bit (do_not_gen, regno);
- regs = regs->next;
- }
- }
+ }
+ bitmap_set_bit (do_not_gen, r);
+ }
}
+/* A subroutine of df_set_dead_notes_for_mw, with a selection of its
+ arguments. Return true if the register value described by MWS's
+ mw_reg is known to be completely dead, and if mw_reg can therefore
+ be used in a REG_DEAD note. */
+
+static bool
+df_whole_mw_reg_dead_p (struct df_mw_hardreg *mws,
+ bitmap live, bitmap artificial_uses,
+ bitmap do_not_gen)
+{
+ unsigned int r;
+
+ /* If MWS describes a partial reference, create REG_DEAD notes for
+ individual hard registers. */
+ if (mws->flags & DF_REF_PARTIAL)
+ return false;
+
+ /* Likewise if some part of the register is not dead. */
+ for (r = mws->start_regno; r <= mws->end_regno; r++)
+ if (bitmap_bit_p (live, r)
+ || bitmap_bit_p (artificial_uses, r)
+ || bitmap_bit_p (do_not_gen, r))
+ return false;
+
+ gcc_assert (REG_P (mws->mw_reg));
+ return true;
+}
+
/* Set the REG_DEAD notes for the multiword hardreg use in INSN based
on the bits in LIVE. DO_NOT_GEN is used to keep REG_DEAD notes
from being set if the instruction both reads and writes the
static void
df_set_dead_notes_for_mw (rtx insn, struct df_mw_hardreg *mws,
bitmap live, bitmap do_not_gen,
- bitmap artificial_uses, int flags)
+ bitmap artificial_uses, bool *added_notes_p)
{
- bool all_dead = true;
- struct df_link *regs = mws->regs;
- unsigned int regno = DF_REF_REGNO (regs->ref);
-
+ unsigned int r;
+ bool is_debug = *added_notes_p;
+
+ *added_notes_p = false;
+
#ifdef REG_DEAD_DEBUGGING
- fprintf (stderr, "mw looking at %d\n", DF_REF_REGNO (regs->ref));
- df_ref_debug (regs->ref, stderr);
-#endif
- while (regs)
+ if (dump_file)
{
- unsigned int regno = DF_REF_REGNO (regs->ref);
- if ((bitmap_bit_p (live, regno))
- || bitmap_bit_p (artificial_uses, regno))
- {
- all_dead = false;
- break;
- }
- regs = regs->next;
+ fprintf (dump_file, "mw_set_dead looking at mws[%d..%d]\n do_not_gen =",
+ mws->start_regno, mws->end_regno);
+ df_print_regset (dump_file, do_not_gen);
+ fprintf (dump_file, " live =");
+ df_print_regset (dump_file, live);
+ fprintf (dump_file, " artificial uses =");
+ df_print_regset (dump_file, artificial_uses);
}
-
- if (all_dead)
+#endif
+
+ if (df_whole_mw_reg_dead_p (mws, live, artificial_uses, do_not_gen))
{
- if (!bitmap_bit_p (do_not_gen, regno))
+ if (is_debug)
{
- /* Add a dead note for the entire multi word register. */
- struct df_link *regs = mws->regs;
- rtx note = alloc_EXPR_LIST (REG_DEAD, *DF_REF_LOC (regs->ref),
- REG_NOTES (insn));
- REG_NOTES (insn) = note;
+ *added_notes_p = true;
+ return;
+ }
+ /* Add a dead note for the entire multi word register. */
+ df_set_note (REG_DEAD, insn, mws->mw_reg);
#ifdef REG_DEAD_DEBUGGING
- print_note ("adding 1: ", insn, note);
+ df_print_note ("adding 1: ", insn, REG_NOTES (insn));
#endif
-
- if (flags & DF_RI_LIFE)
- {
- struct df_link *regs = mws->regs;
- while (regs)
- {
- struct df_ref *ref = regs->ref;
- regno = DF_REF_REGNO (ref);
- REG_N_DEATHS (regno)++;
- regs = regs->next;
- }
- }
- }
}
else
{
- struct df_link *regs = mws->regs;
- while (regs)
- {
- struct df_ref *ref = regs->ref;
-
- regno = DF_REF_REGNO (ref);
- if ((!bitmap_bit_p (live, regno))
- && (!bitmap_bit_p (artificial_uses, regno))
- && (!bitmap_bit_p (do_not_gen, regno)))
- {
- rtx note = alloc_EXPR_LIST (REG_DEAD, regno_reg_rtx[regno],
- REG_NOTES (insn));
- REG_NOTES (insn) = note;
- if (flags & DF_RI_LIFE)
- REG_N_DEATHS (regno)++;
+ for (r = mws->start_regno; r <= mws->end_regno; r++)
+ if (!bitmap_bit_p (live, r)
+ && !bitmap_bit_p (artificial_uses, r)
+ && !bitmap_bit_p (do_not_gen, r))
+ {
+ if (is_debug)
+ {
+ *added_notes_p = true;
+ return;
+ }
+ df_set_note (REG_DEAD, insn, regno_reg_rtx[r]);
#ifdef REG_DEAD_DEBUGGING
- print_note ("adding 2: ", insn, note);
+ df_print_note ("adding 2: ", insn, REG_NOTES (insn));
#endif
- }
-
- regs = regs->next;
- }
+ }
}
+ return;
}
-/* Create a REG_UNUSED note if necessary for DEF in INSN updating LIVE
- and DO_NOT_GEN. Do not generate notes for registers in artificial
- uses. */
+/* Create a REG_UNUSED note if necessary for DEF in INSN updating
+ LIVE. Do not generate notes for registers in ARTIFICIAL_USES. */
static void
-df_create_unused_note (basic_block bb, rtx insn, struct df_ref *def,
- bitmap live, bitmap do_not_gen, bitmap artificial_uses,
- bitmap local_live, bitmap local_processed,
- int flags, int luid)
+df_create_unused_note (rtx insn, df_ref def,
+ bitmap live, bitmap artificial_uses,
+ struct dead_debug *debug)
{
unsigned int dregno = DF_REF_REGNO (def);
-
-#ifdef REG_DEAD_DEBUGGING
- fprintf (stderr, " regular looking at def ");
- df_ref_debug (def, stderr);
-#endif
- if (bitmap_bit_p (live, dregno))
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
{
- if (flags & DF_RI_LIFE)
- {
- /* If we have seen this regno, then it has already been
- processed correctly with the per insn increment. If we
- have not seen it we need to add the length from here to
- the end of the block to the live length. */
- if (bitmap_bit_p (local_processed, dregno))
- {
- if (!(DF_REF_FLAGS (def) & DF_REF_PARTIAL))
- bitmap_clear_bit (local_live, dregno);
- }
- else
- {
- bitmap_set_bit (local_processed, dregno);
- REG_LIVE_LENGTH (dregno) += luid;
- }
- }
+ fprintf (dump_file, " regular looking at def ");
+ df_ref_debug (def, dump_file);
}
- else if ((!(DF_REF_FLAGS (def) & DF_REF_MW_HARDREG))
- && (!bitmap_bit_p (artificial_uses, dregno))
- && (!df_ignore_stack_reg (dregno)))
+#endif
+
+ if (!((DF_REF_FLAGS (def) & DF_REF_MW_HARDREG)
+ || bitmap_bit_p (live, dregno)
+ || bitmap_bit_p (artificial_uses, dregno)
+ || df_ignore_stack_reg (dregno)))
{
- rtx reg = GET_CODE (*DF_REF_LOC (def)) == SUBREG ?
- SUBREG_REG (*DF_REF_LOC (def)) : *DF_REF_LOC (def);
- rtx note = alloc_EXPR_LIST (REG_UNUSED, reg, REG_NOTES (insn));
- REG_NOTES (insn) = note;
+ rtx reg = (DF_REF_LOC (def))
+ ? *DF_REF_REAL_LOC (def): DF_REF_REG (def);
+ df_set_note (REG_UNUSED, insn, reg);
+ dead_debug_insert_temp (debug, dregno, insn, DEBUG_TEMP_AFTER_WITH_REG);
#ifdef REG_DEAD_DEBUGGING
- print_note ("adding 3: ", insn, note);
+ df_print_note ("adding 3: ", insn, REG_NOTES (insn));
#endif
- if (flags & DF_RI_LIFE)
- {
- REG_N_DEATHS (dregno) ++;
- REG_LIVE_LENGTH (dregno)++;
- }
- }
-
- if ((flags & DF_RI_LIFE) && (dregno >= FIRST_PSEUDO_REGISTER))
- {
- REG_FREQ (dregno) += REG_FREQ_FROM_BB (bb);
- if (REG_BASIC_BLOCK (dregno) == REG_BLOCK_UNKNOWN)
- REG_BASIC_BLOCK (dregno) = bb->index;
- else if (REG_BASIC_BLOCK (dregno) != bb->index)
- REG_BASIC_BLOCK (dregno) = REG_BLOCK_GLOBAL;
}
- if (!(DF_REF_FLAGS (def) & (DF_REF_MUST_CLOBBER + DF_REF_MAY_CLOBBER)))
- bitmap_set_bit (do_not_gen, dregno);
-
- /* Kill this register if it is not a subreg store. */
- if (!(DF_REF_FLAGS (def) & DF_REF_PARTIAL))
- bitmap_clear_bit (live, dregno);
+ return;
}
-/* Recompute the REG_DEAD and REG_UNUSED notes and compute register
- info: lifetime, bb, and number of defs and uses for basic block
- BB. The three bitvectors are scratch regs used here. */
+/* Initialize DEBUG to an empty list, and clear USED, if given. */
+void
+dead_debug_init (struct dead_debug *debug, bitmap used)
+{
+ debug->head = NULL;
+ debug->used = used;
+ debug->to_rescan = NULL;
+ if (used)
+ bitmap_clear (used);
+}
+
+/* Reset all debug uses in HEAD, and clear DEBUG->to_rescan bits of
+ each reset insn. DEBUG is not otherwise modified. If HEAD is
+ DEBUG->head, DEBUG->head will be set to NULL at the end.
+ Otherwise, entries from DEBUG->head that pertain to reset insns
+ will be removed, and only then rescanned. */
static void
-df_ri_bb_compute (struct dataflow *dflow, unsigned int bb_index,
- bitmap live, bitmap do_not_gen, bitmap artificial_uses,
- bitmap local_live, bitmap local_processed, bitmap setjumps_crossed)
+dead_debug_reset_uses (struct dead_debug *debug, struct dead_debug_use *head)
{
- struct df *df = dflow->df;
- basic_block bb = BASIC_BLOCK (bb_index);
- rtx insn;
- struct df_ref *def;
- struct df_ref *use;
- int luid = 0;
+ bool got_head = (debug->head == head);
+ bitmap rescan;
+ struct dead_debug_use **tailp = &debug->head;
+ struct dead_debug_use *cur;
+ bitmap_iterator bi;
+ unsigned int uid;
- bitmap_copy (live, df_get_live_out (df, bb));
- bitmap_clear (artificial_uses);
+ if (got_head)
+ rescan = NULL;
+ else
+ rescan = BITMAP_ALLOC (NULL);
- if (dflow->flags & DF_RI_LIFE)
+ while (head)
{
- /* Process the regs live at the end of the block. Mark them as
- not local to any one basic block. */
- bitmap_iterator bi;
- unsigned int regno;
- EXECUTE_IF_SET_IN_BITMAP (live, 0, regno, bi)
- REG_BASIC_BLOCK (regno) = REG_BLOCK_GLOBAL;
+ struct dead_debug_use *next = head->next;
+ rtx insn;
+
+ insn = DF_REF_INSN (head->use);
+ if (!next || DF_REF_INSN (next->use) != insn)
+ {
+ INSN_VAR_LOCATION_LOC (insn) = gen_rtx_UNKNOWN_VAR_LOC ();
+ if (got_head)
+ df_insn_rescan_debug_internal (insn);
+ else
+ bitmap_set_bit (rescan, INSN_UID (insn));
+ if (debug->to_rescan)
+ bitmap_clear_bit (debug->to_rescan, INSN_UID (insn));
+ }
+ XDELETE (head);
+ head = next;
}
- /* Process the artificial defs and uses at the bottom of the block
- to begin processing. */
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
- bitmap_clear_bit (live, DF_REF_REGNO (def));
+ if (got_head)
+ {
+ debug->head = NULL;
+ return;
+ }
- for (use = df_get_artificial_uses (df, bb_index); use; use = use->next_ref)
- if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
+ while ((cur = *tailp))
+ if (bitmap_bit_p (rescan, INSN_UID (DF_REF_INSN (cur->use))))
{
- unsigned int regno = DF_REF_REGNO (use);
- bitmap_set_bit (live, regno);
-
- /* Notes are not generated for any of the artificial registers
- at the bottom of the block. */
- bitmap_set_bit (artificial_uses, regno);
+ *tailp = cur->next;
+ XDELETE (cur);
}
-
- FOR_BB_INSNS_REVERSE (bb, insn)
+ else
+ tailp = &cur->next;
+
+ EXECUTE_IF_SET_IN_BITMAP (rescan, 0, uid, bi)
+ {
+ struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid);
+ if (insn_info)
+ df_insn_rescan_debug_internal (insn_info->insn);
+ }
+
+ BITMAP_FREE (rescan);
+}
+
+/* Reset all debug insns with pending uses. Release the bitmap in it,
+ unless it is USED. USED must be the same bitmap passed to
+ dead_debug_init. */
+void
+dead_debug_finish (struct dead_debug *debug, bitmap used)
+{
+ if (debug->used != used)
+ BITMAP_FREE (debug->used);
+
+ dead_debug_reset_uses (debug, debug->head);
+
+ if (debug->to_rescan)
{
- unsigned int uid = INSN_UID (insn);
- unsigned int regno;
bitmap_iterator bi;
- struct df_mw_hardreg *mws;
-
- if (!INSN_P (insn))
- continue;
+ unsigned int uid;
- if (dflow->flags & DF_RI_LIFE)
+ EXECUTE_IF_SET_IN_BITMAP (debug->to_rescan, 0, uid, bi)
{
- /* Increment the live_length for all of the registers that
- are are referenced in this block and live at this
- particular point. */
- bitmap_iterator bi;
- unsigned int regno;
- EXECUTE_IF_SET_IN_BITMAP (local_live, 0, regno, bi)
- {
- REG_LIVE_LENGTH (regno)++;
- }
- luid++;
+ struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid);
+ if (insn_info)
+ df_insn_rescan (insn_info->insn);
}
+ BITMAP_FREE (debug->to_rescan);
+ }
+}
- bitmap_clear (do_not_gen);
- df_kill_notes (insn, dflow->flags);
+/* Add USE to DEBUG. It must be a dead reference to UREGNO in a debug
+ insn. Create a bitmap for DEBUG as needed. */
+void
+dead_debug_add (struct dead_debug *debug, df_ref use, unsigned int uregno)
+{
+ struct dead_debug_use *newddu = XNEW (struct dead_debug_use);
- /* Process the defs. */
- if (CALL_P (insn))
- {
- if (dflow->flags & DF_RI_LIFE)
- {
- bool can_throw = can_throw_internal (insn);
- bool set_jump = (find_reg_note (insn, REG_SETJMP, NULL) != NULL);
- EXECUTE_IF_SET_IN_BITMAP (live, 0, regno, bi)
- {
- REG_N_CALLS_CROSSED (regno)++;
- if (can_throw)
- REG_N_THROWING_CALLS_CROSSED (regno)++;
-
- /* We have a problem with any pseudoreg that lives
- across the setjmp. ANSI says that if a user
- variable does not change in value between the
- setjmp and the longjmp, then the longjmp
- preserves it. This includes longjmp from a place
- where the pseudo appears dead. (In principle,
- the value still exists if it is in scope.) If
- the pseudo goes in a hard reg, some other value
- may occupy that hard reg where this pseudo is
- dead, thus clobbering the pseudo. Conclusion:
- such a pseudo must not go in a hard reg. */
- if (set_jump && regno >= FIRST_PSEUDO_REGISTER)
- bitmap_set_bit (setjumps_crossed, regno);
- }
- }
-
- /* We only care about real sets for calls. Clobbers only
- may clobber and cannot be depended on. */
- for (mws = DF_INSN_UID_MWS (df, uid); mws; mws = mws->next)
- {
- if ((mws->type == DF_REF_REG_DEF)
- && !df_ignore_stack_reg (REGNO (mws->mw_reg)))
- df_set_unused_notes_for_mw (insn, mws, live, do_not_gen,
- artificial_uses, dflow->flags);
- }
+ newddu->use = use;
+ newddu->next = debug->head;
+ debug->head = newddu;
- /* All of the defs except the return value are some sort of
- clobber. This code is for the return. */
- for (def = DF_INSN_UID_DEFS (df, uid); def; def = def->next_ref)
- if (!(DF_REF_FLAGS (def) & (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER)))
- df_create_unused_note (bb, insn, def, live, do_not_gen,
- artificial_uses, local_live,
- local_processed, dflow->flags, luid);
+ if (!debug->used)
+ debug->used = BITMAP_ALLOC (NULL);
+
+ /* ??? If we dealt with split multi-registers below, we should set
+ all registers for the used mode in case of hardware
+ registers. */
+ bitmap_set_bit (debug->used, uregno);
+}
+/* If UREGNO is referenced by any entry in DEBUG, emit a debug insn
+ before or after INSN (depending on WHERE), that binds a debug temp
+ to the widest-mode use of UREGNO, if WHERE is *_WITH_REG, or the
+ value stored in UREGNO by INSN otherwise, and replace all uses of
+ UREGNO in DEBUG with uses of the debug temp. INSN must be where
+ UREGNO dies, if WHERE is *_BEFORE_*, or where it is set otherwise.
+ Return the number of debug insns emitted. */
+int
+dead_debug_insert_temp (struct dead_debug *debug, unsigned int uregno,
+ rtx insn, enum debug_temp_where where)
+{
+ struct dead_debug_use **tailp = &debug->head;
+ struct dead_debug_use *cur;
+ struct dead_debug_use *uses = NULL;
+ struct dead_debug_use **usesp = &uses;
+ rtx reg = NULL;
+ rtx breg;
+ rtx dval;
+ rtx bind;
+
+ if (!debug->used || !bitmap_clear_bit (debug->used, uregno))
+ return 0;
+
+ /* Move all uses of uregno from debug->head to uses, setting mode to
+ the widest referenced mode. */
+ while ((cur = *tailp))
+ {
+ if (DF_REF_REGNO (cur->use) == uregno)
+ {
+ *usesp = cur;
+ usesp = &cur->next;
+ *tailp = cur->next;
+ cur->next = NULL;
+ if (!reg
+ || (GET_MODE_BITSIZE (GET_MODE (reg))
+ < GET_MODE_BITSIZE (GET_MODE (*DF_REF_REAL_LOC (cur->use)))))
+ reg = *DF_REF_REAL_LOC (cur->use);
}
else
+ tailp = &(*tailp)->next;
+ }
+
+ /* We may have dangling bits in debug->used for registers that were part
+ of a multi-register use, one component of which has been reset. */
+ if (reg == NULL)
+ {
+ gcc_checking_assert (!uses);
+ return 0;
+ }
+
+ gcc_checking_assert (uses);
+
+ breg = reg;
+ /* Recover the expression INSN stores in REG. */
+ if (where == DEBUG_TEMP_BEFORE_WITH_VALUE)
+ {
+ rtx set = single_set (insn);
+ rtx dest, src;
+
+ if (set)
{
- /* Regular insn. */
- for (mws = DF_INSN_UID_MWS (df, uid); mws; mws = mws->next)
+ dest = SET_DEST (set);
+ src = SET_SRC (set);
+ /* Lose if the REG-setting insn is a CALL. */
+ if (GET_CODE (src) == CALL)
{
- if (mws->type == DF_REF_REG_DEF)
- df_set_unused_notes_for_mw (insn, mws, live, do_not_gen,
- artificial_uses, dflow->flags);
+ while (uses)
+ {
+ cur = uses->next;
+ XDELETE (uses);
+ uses = cur;
+ }
+ return 0;
}
+ }
- for (def = DF_INSN_UID_DEFS (df, uid); def; def = def->next_ref)
- df_create_unused_note (bb, insn, def, live, do_not_gen,
- artificial_uses, local_live,
- local_processed, dflow->flags, luid);
+ /* ??? Should we try to extract it from a PARALLEL? */
+ if (!set)
+ breg = NULL;
+ /* Cool, it's the same REG, we can use SRC. */
+ else if (dest == reg)
+ breg = copy_rtx (src);
+ else if (REG_P (dest))
+ {
+ /* Hmm... Something's fishy, we should be setting REG here. */
+ if (REGNO (dest) != REGNO (reg))
+ breg = NULL;
+ /* If we're not overwriting all the hardware registers that
+ setting REG in its mode would, we won't know what to bind
+ the debug temp to. ??? We could bind the debug_expr to a
+ CONCAT or PARALLEL with the split multi-registers, and
+ replace them as we found the corresponding sets. */
+ else if (REGNO (reg) < FIRST_PSEUDO_REGISTER
+ && (hard_regno_nregs[REGNO (reg)][GET_MODE (reg)]
+ != hard_regno_nregs[REGNO (reg)][GET_MODE (dest)]))
+ breg = NULL;
+ /* Ok, it's the same (hardware) REG, but with a different
+ mode, so SUBREG it. */
+ else
+ breg = lowpart_subreg (GET_MODE (reg), copy_rtx (src),
+ GET_MODE (dest));
}
-
+ else if (GET_CODE (dest) == SUBREG)
+ {
+ /* We should be setting REG here. Lose. */
+ if (REGNO (SUBREG_REG (dest)) != REGNO (reg))
+ breg = NULL;
+ /* Lose if we're setting something other than the lowpart of
+ REG. */
+ else if (!subreg_lowpart_p (dest))
+ breg = NULL;
+ /* If we're not overwriting all the hardware registers that
+ setting REG in its mode would, we won't know what to bind
+ the debug temp to. */
+ else if (REGNO (reg) < FIRST_PSEUDO_REGISTER
+ && (hard_regno_nregs[REGNO (reg)][GET_MODE (reg)]
+ != hard_regno_nregs[REGNO (reg)][GET_MODE (dest)]))
+ breg = NULL;
+ /* Yay, we can use SRC, just adjust its mode. */
+ else
+ breg = lowpart_subreg (GET_MODE (reg), copy_rtx (src),
+ GET_MODE (dest));
+ }
+ /* Oh well, we're out of luck. */
+ else
+ breg = NULL;
+
+ /* We couldn't figure out the value stored in REG, so reset all
+ of its pending debug uses. */
+ if (!breg)
+ {
+ dead_debug_reset_uses (debug, uses);
+ return 0;
+ }
+ }
+
+ /* If there's a single (debug) use of an otherwise unused REG, and
+ the debug use is not part of a larger expression, then it
+ probably doesn't make sense to introduce a new debug temp. */
+ if (where == DEBUG_TEMP_AFTER_WITH_REG && !uses->next)
+ {
+ rtx next = DF_REF_INSN (uses->use);
+
+ if (DEBUG_INSN_P (next) && reg == INSN_VAR_LOCATION_LOC (next))
+ {
+ XDELETE (uses);
+ return 0;
+ }
+ }
+
+ /* Create DEBUG_EXPR (and DEBUG_EXPR_DECL). */
+ dval = make_debug_expr_from_rtl (reg);
+
+ /* Emit a debug bind insn before the insn in which reg dies. */
+ bind = gen_rtx_VAR_LOCATION (GET_MODE (reg),
+ DEBUG_EXPR_TREE_DECL (dval), breg,
+ VAR_INIT_STATUS_INITIALIZED);
+
+ if (where == DEBUG_TEMP_AFTER_WITH_REG)
+ bind = emit_debug_insn_after (bind, insn);
+ else
+ bind = emit_debug_insn_before (bind, insn);
+ df_insn_rescan (bind);
+
+ /* Adjust all uses. */
+ while ((cur = uses))
+ {
+ if (GET_MODE (*DF_REF_REAL_LOC (cur->use)) == GET_MODE (reg))
+ *DF_REF_REAL_LOC (cur->use) = dval;
+ else
+ *DF_REF_REAL_LOC (cur->use)
+ = gen_lowpart_SUBREG (GET_MODE (*DF_REF_REAL_LOC (cur->use)), dval);
+ /* ??? Should we simplify subreg of subreg? */
+ if (debug->to_rescan == NULL)
+ debug->to_rescan = BITMAP_ALLOC (NULL);
+ bitmap_set_bit (debug->to_rescan, INSN_UID (DF_REF_INSN (cur->use)));
+ uses = cur->next;
+ XDELETE (cur);
+ }
+
+ return 1;
+}
+
+/* Recompute the REG_DEAD and REG_UNUSED notes and compute register
+ info: lifetime, bb, and number of defs and uses for basic block
+ BB. The three bitvectors are scratch regs used here. */
+
+static void
+df_note_bb_compute (unsigned int bb_index,
+ bitmap live, bitmap do_not_gen, bitmap artificial_uses)
+{
+ basic_block bb = BASIC_BLOCK (bb_index);
+ rtx insn;
+ df_ref *def_rec;
+ df_ref *use_rec;
+ struct dead_debug debug;
+
+ dead_debug_init (&debug, NULL);
+
+ bitmap_copy (live, df_get_live_out (bb));
+ bitmap_clear (artificial_uses);
+
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
+ {
+ fprintf (dump_file, "live at bottom ");
+ df_print_regset (dump_file, live);
+ }
+#endif
+
+ /* Process the artificial defs and uses at the bottom of the block
+ to begin processing. */
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
+ fprintf (dump_file, "artificial def %d\n", DF_REF_REGNO (def));
+#endif
+
+ if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
+ bitmap_clear_bit (live, DF_REF_REGNO (def));
+ }
+
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ df_ref use = *use_rec;
+ if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
+ {
+ unsigned int regno = DF_REF_REGNO (use);
+ bitmap_set_bit (live, regno);
+
+ /* Notes are not generated for any of the artificial registers
+ at the bottom of the block. */
+ bitmap_set_bit (artificial_uses, regno);
+ }
+ }
+
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
+ {
+ fprintf (dump_file, "live before artificials out ");
+ df_print_regset (dump_file, live);
+ }
+#endif
+
+ FOR_BB_INSNS_REVERSE (bb, insn)
+ {
+ unsigned int uid = INSN_UID (insn);
+ struct df_mw_hardreg **mws_rec;
+ int debug_insn;
+
+ if (!INSN_P (insn))
+ continue;
+
+ debug_insn = DEBUG_INSN_P (insn);
+
+ bitmap_clear (do_not_gen);
+ df_kill_notes (insn, live);
+
+ /* Process the defs. */
+ if (CALL_P (insn))
+ {
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
+ {
+ fprintf (dump_file, "processing call %d\n live =", INSN_UID (insn));
+ df_print_regset (dump_file, live);
+ }
+#endif
+ /* We only care about real sets for calls. Clobbers cannot
+ be depended on to really die. */
+ mws_rec = DF_INSN_UID_MWS (uid);
+ while (*mws_rec)
+ {
+ struct df_mw_hardreg *mws = *mws_rec;
+ if ((DF_MWS_REG_DEF_P (mws))
+ && !df_ignore_stack_reg (mws->start_regno))
+ df_set_unused_notes_for_mw (insn,
+ mws, live, do_not_gen,
+ artificial_uses, &debug);
+ mws_rec++;
+ }
+
+ /* All of the defs except the return value are some sort of
+ clobber. This code is for the return. */
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ unsigned int dregno = DF_REF_REGNO (def);
+ if (!DF_REF_FLAGS_IS_SET (def, DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER))
+ {
+ df_create_unused_note (insn,
+ def, live, artificial_uses, &debug);
+ bitmap_set_bit (do_not_gen, dregno);
+ }
+
+ if (!DF_REF_FLAGS_IS_SET (def, DF_REF_PARTIAL | DF_REF_CONDITIONAL))
+ bitmap_clear_bit (live, dregno);
+ }
+ }
+ else
+ {
+ /* Regular insn. */
+ mws_rec = DF_INSN_UID_MWS (uid);
+ while (*mws_rec)
+ {
+ struct df_mw_hardreg *mws = *mws_rec;
+ if (DF_MWS_REG_DEF_P (mws))
+ df_set_unused_notes_for_mw (insn,
+ mws, live, do_not_gen,
+ artificial_uses, &debug);
+ mws_rec++;
+ }
+
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ unsigned int dregno = DF_REF_REGNO (def);
+ df_create_unused_note (insn,
+ def, live, artificial_uses, &debug);
+
+ if (!DF_REF_FLAGS_IS_SET (def, DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER))
+ bitmap_set_bit (do_not_gen, dregno);
+
+ if (!DF_REF_FLAGS_IS_SET (def, DF_REF_PARTIAL | DF_REF_CONDITIONAL))
+ bitmap_clear_bit (live, dregno);
+ }
+ }
+
/* Process the uses. */
- for (mws = DF_INSN_UID_MWS (df, uid); mws; mws = mws->next)
+ mws_rec = DF_INSN_UID_MWS (uid);
+ while (*mws_rec)
{
- if ((mws->type != DF_REF_REG_DEF)
- && !df_ignore_stack_reg (REGNO (mws->mw_reg)))
- df_set_dead_notes_for_mw (insn, mws, live, do_not_gen,
- artificial_uses, dflow->flags);
+ struct df_mw_hardreg *mws = *mws_rec;
+ if (DF_MWS_REG_USE_P (mws)
+ && !df_ignore_stack_reg (mws->start_regno))
+ {
+ bool really_add_notes = debug_insn != 0;
+
+ df_set_dead_notes_for_mw (insn,
+ mws, live, do_not_gen,
+ artificial_uses,
+ &really_add_notes);
+
+ if (really_add_notes)
+ debug_insn = -1;
+ }
+ mws_rec++;
}
- for (use = DF_INSN_UID_USES (df, uid); use; use = use->next_ref)
+ for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
{
+ df_ref use = *use_rec;
unsigned int uregno = DF_REF_REGNO (use);
- if ((dflow->flags & DF_RI_LIFE) && (uregno >= FIRST_PSEUDO_REGISTER))
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file && !debug_insn)
{
- REG_FREQ (uregno) += REG_FREQ_FROM_BB (bb);
- if (REG_BASIC_BLOCK (uregno) == REG_BLOCK_UNKNOWN)
- REG_BASIC_BLOCK (uregno) = bb->index;
- else if (REG_BASIC_BLOCK (uregno) != bb->index)
- REG_BASIC_BLOCK (uregno) = REG_BLOCK_GLOBAL;
+ fprintf (dump_file, " regular looking at use ");
+ df_ref_debug (use, dump_file);
}
-
-#ifdef REG_DEAD_DEBUGGING
- fprintf (stderr, " regular looking at use ");
- df_ref_debug (use, stderr);
#endif
if (!bitmap_bit_p (live, uregno))
{
- if ( (!(DF_REF_FLAGS (use) & DF_REF_MW_HARDREG))
+ if (debug_insn)
+ {
+ if (debug_insn > 0)
+ {
+ /* We won't add REG_UNUSED or REG_DEAD notes for
+ these, so we don't have to mess with them in
+ debug insns either. */
+ if (!bitmap_bit_p (artificial_uses, uregno)
+ && !df_ignore_stack_reg (uregno))
+ dead_debug_add (&debug, use, uregno);
+ continue;
+ }
+ break;
+ }
+ else
+ dead_debug_insert_temp (&debug, uregno, insn,
+ DEBUG_TEMP_BEFORE_WITH_REG);
+
+ if ( (!(DF_REF_FLAGS (use)
+ & (DF_REF_MW_HARDREG | DF_REF_READ_WRITE)))
&& (!bitmap_bit_p (do_not_gen, uregno))
&& (!bitmap_bit_p (artificial_uses, uregno))
- && (!(DF_REF_FLAGS (use) & DF_REF_READ_WRITE))
&& (!df_ignore_stack_reg (uregno)))
{
- rtx reg = GET_CODE (*DF_REF_LOC (use)) == SUBREG ?
- SUBREG_REG (*DF_REF_LOC (use)) : *DF_REF_LOC (use);
- rtx note = alloc_EXPR_LIST (REG_DEAD, reg, REG_NOTES (insn));
- REG_NOTES (insn) = note;
- if (dflow->flags & DF_RI_LIFE)
- REG_N_DEATHS (uregno)++;
+ rtx reg = (DF_REF_LOC (use))
+ ? *DF_REF_REAL_LOC (use) : DF_REF_REG (use);
+ df_set_note (REG_DEAD, insn, reg);
#ifdef REG_DEAD_DEBUGGING
- print_note ("adding 4: ", insn, note);
+ df_print_note ("adding 4: ", insn, REG_NOTES (insn));
#endif
}
/* This register is now live. */
bitmap_set_bit (live, uregno);
-
- if (dflow->flags & DF_RI_LIFE)
- {
- /* If we have seen this regno, then it has already
- been processed correctly with the per insn
- increment. If we have not seen it we set the bit
- so that begins to get processed locally. Note
- that we don't even get here if the variable was
- live at the end of the block since just a ref
- inside the block does not effect the
- calculations. */
- REG_LIVE_LENGTH (uregno) ++;
- bitmap_set_bit (local_live, uregno);
- bitmap_set_bit (local_processed, uregno);
- }
}
}
- }
-
- if (dflow->flags & DF_RI_LIFE)
- {
- /* Add the length of the block to all of the registers that were
- not referenced, but still live in this block. */
- bitmap_iterator bi;
- unsigned int regno;
- bitmap_and_compl_into (live, local_processed);
- EXECUTE_IF_SET_IN_BITMAP (live, 0, regno, bi)
+
+ if (debug_insn == -1)
{
- REG_LIVE_LENGTH (regno) += luid;
+ /* ??? We could probably do better here, replacing dead
+ registers with their definitions. */
+ INSN_VAR_LOCATION_LOC (insn) = gen_rtx_UNKNOWN_VAR_LOC ();
+ df_insn_rescan_debug_internal (insn);
}
- bitmap_clear (local_processed);
- bitmap_clear (local_live);
}
+
+ dead_debug_finish (&debug, NULL);
}
/* Compute register info: lifetime, bb, and number of defs and uses. */
static void
-df_ri_compute (struct dataflow *dflow, bitmap all_blocks ATTRIBUTE_UNUSED,
- bitmap blocks_to_scan)
+df_note_compute (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
- bitmap live = BITMAP_ALLOC (NULL);
- bitmap do_not_gen = BITMAP_ALLOC (NULL);
- bitmap artificial_uses = BITMAP_ALLOC (NULL);
- bitmap local_live = NULL;
- bitmap local_processed = NULL;
- bitmap setjumps_crossed = NULL;
-
- if (dflow->flags & DF_RI_LIFE)
- {
- local_live = BITMAP_ALLOC (NULL);
- local_processed = BITMAP_ALLOC (NULL);
- setjumps_crossed = BITMAP_ALLOC (NULL);
- }
+ bitmap_head live, do_not_gen, artificial_uses;
+ bitmap_initialize (&live, &df_bitmap_obstack);
+ bitmap_initialize (&do_not_gen, &df_bitmap_obstack);
+ bitmap_initialize (&artificial_uses, &df_bitmap_obstack);
#ifdef REG_DEAD_DEBUGGING
- df_lr_dump (dflow->df->problems_by_index [DF_LR], stderr);
- print_rtl_with_bb (stderr, get_insns());
+ if (dump_file)
+ print_rtl_with_bb (dump_file, get_insns());
#endif
- EXECUTE_IF_SET_IN_BITMAP (blocks_to_scan, 0, bb_index, bi)
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- df_ri_bb_compute (dflow, bb_index, live, do_not_gen, artificial_uses,
- local_live, local_processed, setjumps_crossed);
+ df_note_bb_compute (bb_index, &live, &do_not_gen, &artificial_uses);
}
- BITMAP_FREE (live);
- BITMAP_FREE (do_not_gen);
- BITMAP_FREE (artificial_uses);
- if (dflow->flags & DF_RI_LIFE)
- {
- bitmap_iterator bi;
- unsigned int regno;
- /* See the setjump comment in df_ri_bb_compute. */
- EXECUTE_IF_SET_IN_BITMAP (setjumps_crossed, 0, regno, bi)
- {
- REG_BASIC_BLOCK (regno) = REG_BLOCK_UNKNOWN;
- REG_LIVE_LENGTH (regno) = -1;
- }
-
- BITMAP_FREE (local_live);
- BITMAP_FREE (local_processed);
- BITMAP_FREE (setjumps_crossed);
- }
+ bitmap_clear (&live);
+ bitmap_clear (&do_not_gen);
+ bitmap_clear (&artificial_uses);
}
/* Free all storage associated with the problem. */
static void
-df_ri_free (struct dataflow *dflow)
+df_note_free (void)
{
- free (dflow->problem_data);
- free (dflow);
+ free (df_note);
}
-/* Debugging info. */
-
-static void
-df_ri_dump (struct dataflow *dflow, FILE *file)
-{
- print_rtl_with_bb (file, get_insns ());
-
- if (dflow->flags & DF_RI_LIFE)
- {
- fprintf (file, "Register info:\n");
- dump_flow_info (file, -1);
- }
-}
-
/* All of the information associated every instance of the problem. */
-static struct df_problem problem_RI =
+static struct df_problem problem_NOTE =
{
- DF_RI, /* Problem id. */
+ DF_NOTE, /* Problem id. */
DF_NONE, /* Direction. */
- df_ri_alloc, /* Allocate the problem specific data. */
+ df_note_alloc, /* Allocate the problem specific data. */
NULL, /* Reset global information. */
NULL, /* Free basic block info. */
- df_ri_compute, /* Local compute function. */
+ df_note_compute, /* Local compute function. */
NULL, /* Init the solution specific data. */
NULL, /* Iterative solver. */
- NULL, /* Confluence operator 0. */
- NULL, /* Confluence operator n. */
+ NULL, /* Confluence operator 0. */
+ NULL, /* Confluence operator n. */
NULL, /* Transfer function. */
NULL, /* Finalize function. */
- df_ri_free, /* Free all of the problem information. */
- df_ri_dump, /* Debugging. */
-
- /* Technically this is only dependent on the live registers problem
- but it will produce information if built one of uninitialized
- register problems (UR, UREC) is also run. */
- df_lr_add_problem, /* Dependent problem. */
- 0 /* Changeable flags. */
+ df_note_free, /* Free all of the problem information. */
+ df_note_free, /* Remove this problem from the stack of dataflow problems. */
+ NULL, /* Debugging. */
+ NULL, /* Debugging start block. */
+ NULL, /* Debugging end block. */
+ NULL, /* Incremental solution verify start. */
+ NULL, /* Incremental solution verify end. */
+ &problem_LR, /* Dependent problem. */
+ sizeof (struct df_scan_bb_info),/* Size of entry of block_info array. */
+ TV_DF_NOTE, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
};
of DF. The returned structure is what is used to get at the
solution. */
-struct dataflow *
-df_ri_add_problem (struct df *df, int flags)
+void
+df_note_add_problem (void)
+{
+ df_add_problem (&problem_NOTE);
+}
+
+
+
+\f
+/*----------------------------------------------------------------------------
+ Functions for simulating the effects of single insns.
+
+ You can either simulate in the forwards direction, starting from
+ the top of a block or the backwards direction from the end of the
+ block. If you go backwards, defs are examined first to clear bits,
+ then uses are examined to set bits. If you go forwards, defs are
+ examined first to set bits, then REG_DEAD and REG_UNUSED notes
+ are examined to clear bits. In either case, the result of examining
+ a def can be undone (respectively by a use or a REG_UNUSED note).
+
+ If you start at the top of the block, use one of DF_LIVE_IN or
+ DF_LR_IN. If you start at the bottom of the block use one of
+ DF_LIVE_OUT or DF_LR_OUT. BE SURE TO PASS A COPY OF THESE SETS,
+ THEY WILL BE DESTROYED.
+----------------------------------------------------------------------------*/
+
+
+/* Find the set of DEFs for INSN. */
+
+void
+df_simulate_find_defs (rtx insn, bitmap defs)
+{
+ df_ref *def_rec;
+ unsigned int uid = INSN_UID (insn);
+
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ bitmap_set_bit (defs, DF_REF_REGNO (def));
+ }
+}
+
+/* Find the set of uses for INSN. This includes partial defs. */
+
+static void
+df_simulate_find_uses (rtx insn, bitmap uses)
+{
+ df_ref *rec;
+ unsigned int uid = INSN_UID (insn);
+
+ for (rec = DF_INSN_UID_DEFS (uid); *rec; rec++)
+ {
+ df_ref def = *rec;
+ if (DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL))
+ bitmap_set_bit (uses, DF_REF_REGNO (def));
+ }
+ for (rec = DF_INSN_UID_USES (uid); *rec; rec++)
+ {
+ df_ref use = *rec;
+ bitmap_set_bit (uses, DF_REF_REGNO (use));
+ }
+}
+
+/* Find the set of real DEFs, which are not clobbers, for INSN. */
+
+void
+df_simulate_find_noclobber_defs (rtx insn, bitmap defs)
+{
+ df_ref *def_rec;
+ unsigned int uid = INSN_UID (insn);
+
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ if (!(DF_REF_FLAGS (def) & (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER)))
+ bitmap_set_bit (defs, DF_REF_REGNO (def));
+ }
+}
+
+
+/* Simulate the effects of the defs of INSN on LIVE. */
+
+void
+df_simulate_defs (rtx insn, bitmap live)
+{
+ df_ref *def_rec;
+ unsigned int uid = INSN_UID (insn);
+
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ unsigned int dregno = DF_REF_REGNO (def);
+
+ /* If the def is to only part of the reg, it does
+ not kill the other defs that reach here. */
+ if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL)))
+ bitmap_clear_bit (live, dregno);
+ }
+}
+
+
+/* Simulate the effects of the uses of INSN on LIVE. */
+
+void
+df_simulate_uses (rtx insn, bitmap live)
+{
+ df_ref *use_rec;
+ unsigned int uid = INSN_UID (insn);
+
+ if (DEBUG_INSN_P (insn))
+ return;
+
+ for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
+ {
+ df_ref use = *use_rec;
+ /* Add use to set of uses in this BB. */
+ bitmap_set_bit (live, DF_REF_REGNO (use));
+ }
+}
+
+
+/* Add back the always live regs in BB to LIVE. */
+
+static inline void
+df_simulate_fixup_sets (basic_block bb, bitmap live)
+{
+ /* These regs are considered always live so if they end up dying
+ because of some def, we need to bring the back again. */
+ if (bb_has_eh_pred (bb))
+ bitmap_ior_into (live, &df->eh_block_artificial_uses);
+ else
+ bitmap_ior_into (live, &df->regular_block_artificial_uses);
+}
+
+
+/*----------------------------------------------------------------------------
+ The following three functions are used only for BACKWARDS scanning:
+ i.e. they process the defs before the uses.
+
+ df_simulate_initialize_backwards should be called first with a
+ bitvector copyied from the DF_LIVE_OUT or DF_LR_OUT. Then
+ df_simulate_one_insn_backwards should be called for each insn in
+ the block, starting with the last one. Finally,
+ df_simulate_finalize_backwards can be called to get a new value
+ of the sets at the top of the block (this is rarely used).
+ ----------------------------------------------------------------------------*/
+
+/* Apply the artificial uses and defs at the end of BB in a backwards
+ direction. */
+
+void
+df_simulate_initialize_backwards (basic_block bb, bitmap live)
+{
+ df_ref *def_rec;
+ df_ref *use_rec;
+ int bb_index = bb->index;
+
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
+ bitmap_clear_bit (live, DF_REF_REGNO (def));
+ }
+
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ df_ref use = *use_rec;
+ if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
+ bitmap_set_bit (live, DF_REF_REGNO (use));
+ }
+}
+
+
+/* Simulate the backwards effects of INSN on the bitmap LIVE. */
+
+void
+df_simulate_one_insn_backwards (basic_block bb, rtx insn, bitmap live)
+{
+ if (!NONDEBUG_INSN_P (insn))
+ return;
+
+ df_simulate_defs (insn, live);
+ df_simulate_uses (insn, live);
+ df_simulate_fixup_sets (bb, live);
+}
+
+
+/* Apply the artificial uses and defs at the top of BB in a backwards
+ direction. */
+
+void
+df_simulate_finalize_backwards (basic_block bb, bitmap live)
{
- return df_add_problem (df, &problem_RI, flags);
+ df_ref *def_rec;
+#ifdef EH_USES
+ df_ref *use_rec;
+#endif
+ int bb_index = bb->index;
+
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
+ bitmap_clear_bit (live, DF_REF_REGNO (def));
+ }
+
+#ifdef EH_USES
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ df_ref use = *use_rec;
+ if (DF_REF_FLAGS (use) & DF_REF_AT_TOP)
+ bitmap_set_bit (live, DF_REF_REGNO (use));
+ }
+#endif
}
+/*----------------------------------------------------------------------------
+ The following three functions are used only for FORWARDS scanning:
+ i.e. they process the defs and the REG_DEAD and REG_UNUSED notes.
+ Thus it is important to add the DF_NOTES problem to the stack of
+ problems computed before using these functions.
+
+ df_simulate_initialize_forwards should be called first with a
+ bitvector copyied from the DF_LIVE_IN or DF_LR_IN. Then
+ df_simulate_one_insn_forwards should be called for each insn in
+ the block, starting with the first one.
+ ----------------------------------------------------------------------------*/
+
+/* Initialize the LIVE bitmap, which should be copied from DF_LIVE_IN or
+ DF_LR_IN for basic block BB, for forward scanning by marking artificial
+ defs live. */
+
+void
+df_simulate_initialize_forwards (basic_block bb, bitmap live)
+{
+ df_ref *def_rec;
+ int bb_index = bb->index;
+
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
+ bitmap_set_bit (live, DF_REF_REGNO (def));
+ }
+}
+
+/* Simulate the forwards effects of INSN on the bitmap LIVE. */
+
+void
+df_simulate_one_insn_forwards (basic_block bb, rtx insn, bitmap live)
+{
+ rtx link;
+ if (! INSN_P (insn))
+ return;
+
+ /* Make sure that DF_NOTE really is an active df problem. */
+ gcc_assert (df_note);
+
+ /* Note that this is the opposite as how the problem is defined, because
+ in the LR problem defs _kill_ liveness. However, they do so backwards,
+ while here the scan is performed forwards! So, first assume that the
+ def is live, and if this is not true REG_UNUSED notes will rectify the
+ situation. */
+ df_simulate_find_noclobber_defs (insn, live);
+
+ /* Clear all of the registers that go dead. */
+ for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
+ {
+ switch (REG_NOTE_KIND (link))
+ {
+ case REG_DEAD:
+ case REG_UNUSED:
+ {
+ rtx reg = XEXP (link, 0);
+ int regno = REGNO (reg);
+ if (HARD_REGISTER_NUM_P (regno))
+ bitmap_clear_range (live, regno,
+ hard_regno_nregs[regno][GET_MODE (reg)]);
+ else
+ bitmap_clear_bit (live, regno);
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ df_simulate_fixup_sets (bb, live);
+}
+\f
+/* Used by the next two functions to encode information about the
+ memory references we found. */
+#define MEMREF_NORMAL 1
+#define MEMREF_VOLATILE 2
+
+/* A subroutine of can_move_insns_across_p called through for_each_rtx.
+ Return either MEMREF_NORMAL or MEMREF_VOLATILE if a memory is found. */
+
+static int
+find_memory (rtx *px, void *data ATTRIBUTE_UNUSED)
+{
+ rtx x = *px;
+
+ if (GET_CODE (x) == ASM_OPERANDS && MEM_VOLATILE_P (x))
+ return MEMREF_VOLATILE;
+
+ if (!MEM_P (x))
+ return 0;
+ if (MEM_VOLATILE_P (x))
+ return MEMREF_VOLATILE;
+ if (MEM_READONLY_P (x))
+ return 0;
+
+ return MEMREF_NORMAL;
+}
+
+/* A subroutine of can_move_insns_across_p called through note_stores.
+ DATA points to an integer in which we set either the bit for
+ MEMREF_NORMAL or the bit for MEMREF_VOLATILE if we find a MEM
+ of either kind. */
+
+static void
+find_memory_stores (rtx x, const_rtx pat ATTRIBUTE_UNUSED,
+ void *data ATTRIBUTE_UNUSED)
+{
+ int *pflags = (int *)data;
+ if (GET_CODE (x) == SUBREG)
+ x = XEXP (x, 0);
+ /* Treat stores to SP as stores to memory, this will prevent problems
+ when there are references to the stack frame. */
+ if (x == stack_pointer_rtx)
+ *pflags |= MEMREF_VOLATILE;
+ if (!MEM_P (x))
+ return;
+ *pflags |= MEM_VOLATILE_P (x) ? MEMREF_VOLATILE : MEMREF_NORMAL;
+}
+
+/* Scan BB backwards, using df_simulate functions to keep track of
+ lifetimes, up to insn POINT. The result is stored in LIVE. */
+
+void
+simulate_backwards_to_point (basic_block bb, regset live, rtx point)
+{
+ rtx insn;
+ bitmap_copy (live, df_get_live_out (bb));
+ df_simulate_initialize_backwards (bb, live);
+
+ /* Scan and update life information until we reach the point we're
+ interested in. */
+ for (insn = BB_END (bb); insn != point; insn = PREV_INSN (insn))
+ df_simulate_one_insn_backwards (bb, insn, live);
+}
+
+/* Return true if it is safe to move a group of insns, described by
+ the range FROM to TO, backwards across another group of insns,
+ described by ACROSS_FROM to ACROSS_TO. It is assumed that there
+ are no insns between ACROSS_TO and FROM, but they may be in
+ different basic blocks; MERGE_BB is the block from which the
+ insns will be moved. The caller must pass in a regset MERGE_LIVE
+ which specifies the registers live after TO.
+
+ This function may be called in one of two cases: either we try to
+ move identical instructions from all successor blocks into their
+ predecessor, or we try to move from only one successor block. If
+ OTHER_BRANCH_LIVE is nonnull, it indicates that we're dealing with
+ the second case. It should contain a set of registers live at the
+ end of ACROSS_TO which must not be clobbered by moving the insns.
+ In that case, we're also more careful about moving memory references
+ and trapping insns.
+
+ We return false if it is not safe to move the entire group, but it
+ may still be possible to move a subgroup. PMOVE_UPTO, if nonnull,
+ is set to point at the last moveable insn in such a case. */
+
+bool
+can_move_insns_across (rtx from, rtx to, rtx across_from, rtx across_to,
+ basic_block merge_bb, regset merge_live,
+ regset other_branch_live, rtx *pmove_upto)
+{
+ rtx insn, next, max_to;
+ bitmap merge_set, merge_use, local_merge_live;
+ bitmap test_set, test_use;
+ unsigned i, fail = 0;
+ bitmap_iterator bi;
+ int memrefs_in_across = 0;
+ int mem_sets_in_across = 0;
+ bool trapping_insns_in_across = false;
+
+ if (pmove_upto != NULL)
+ *pmove_upto = NULL_RTX;
+
+ /* Find real bounds, ignoring debug insns. */
+ while (!NONDEBUG_INSN_P (from) && from != to)
+ from = NEXT_INSN (from);
+ while (!NONDEBUG_INSN_P (to) && from != to)
+ to = PREV_INSN (to);
+
+ for (insn = across_to; ; insn = next)
+ {
+ if (NONDEBUG_INSN_P (insn))
+ {
+ memrefs_in_across |= for_each_rtx (&PATTERN (insn), find_memory,
+ NULL);
+ note_stores (PATTERN (insn), find_memory_stores,
+ &mem_sets_in_across);
+ /* This is used just to find sets of the stack pointer. */
+ memrefs_in_across |= mem_sets_in_across;
+ trapping_insns_in_across |= may_trap_p (PATTERN (insn));
+ }
+ next = PREV_INSN (insn);
+ if (insn == across_from)
+ break;
+ }
+
+ /* Collect:
+ MERGE_SET = set of registers set in MERGE_BB
+ MERGE_USE = set of registers used in MERGE_BB and live at its top
+ MERGE_LIVE = set of registers live at the point inside the MERGE
+ range that we've reached during scanning
+ TEST_SET = set of registers set between ACROSS_FROM and ACROSS_END.
+ TEST_USE = set of registers used between ACROSS_FROM and ACROSS_END,
+ and live before ACROSS_FROM. */
+
+ merge_set = BITMAP_ALLOC (®_obstack);
+ merge_use = BITMAP_ALLOC (®_obstack);
+ local_merge_live = BITMAP_ALLOC (®_obstack);
+ test_set = BITMAP_ALLOC (®_obstack);
+ test_use = BITMAP_ALLOC (®_obstack);
+
+ /* Compute the set of registers set and used in the ACROSS range. */
+ if (other_branch_live != NULL)
+ bitmap_copy (test_use, other_branch_live);
+ df_simulate_initialize_backwards (merge_bb, test_use);
+ for (insn = across_to; ; insn = next)
+ {
+ if (NONDEBUG_INSN_P (insn))
+ {
+ df_simulate_find_defs (insn, test_set);
+ df_simulate_defs (insn, test_use);
+ df_simulate_uses (insn, test_use);
+ }
+ next = PREV_INSN (insn);
+ if (insn == across_from)
+ break;
+ }
+
+ /* Compute an upper bound for the amount of insns moved, by finding
+ the first insn in MERGE that sets a register in TEST_USE, or uses
+ a register in TEST_SET. We also check for calls, trapping operations,
+ and memory references. */
+ max_to = NULL_RTX;
+ for (insn = from; ; insn = next)
+ {
+ if (CALL_P (insn))
+ break;
+ if (NOTE_P (insn) && NOTE_KIND (insn) == NOTE_INSN_EPILOGUE_BEG)
+ break;
+ if (NONDEBUG_INSN_P (insn))
+ {
+ if (may_trap_or_fault_p (PATTERN (insn))
+ && (trapping_insns_in_across || other_branch_live != NULL))
+ break;
+
+ /* We cannot move memory stores past each other, or move memory
+ reads past stores, at least not without tracking them and
+ calling true_dependence on every pair.
+
+ If there is no other branch and no memory references or
+ sets in the ACROSS range, we can move memory references
+ freely, even volatile ones.
+
+ Otherwise, the rules are as follows: volatile memory
+ references and stores can't be moved at all, and any type
+ of memory reference can't be moved if there are volatile
+ accesses or stores in the ACROSS range. That leaves
+ normal reads, which can be moved, as the trapping case is
+ dealt with elsewhere. */
+ if (other_branch_live != NULL || memrefs_in_across != 0)
+ {
+ int mem_ref_flags = 0;
+ int mem_set_flags = 0;
+ note_stores (PATTERN (insn), find_memory_stores, &mem_set_flags);
+ mem_ref_flags = for_each_rtx (&PATTERN (insn), find_memory,
+ NULL);
+ /* Catch sets of the stack pointer. */
+ mem_ref_flags |= mem_set_flags;
+
+ if ((mem_ref_flags | mem_set_flags) & MEMREF_VOLATILE)
+ break;
+ if ((memrefs_in_across & MEMREF_VOLATILE) && mem_ref_flags != 0)
+ break;
+ if (mem_set_flags != 0
+ || (mem_sets_in_across != 0 && mem_ref_flags != 0))
+ break;
+ }
+ df_simulate_find_uses (insn, merge_use);
+ /* We're only interested in uses which use a value live at
+ the top, not one previously set in this block. */
+ bitmap_and_compl_into (merge_use, merge_set);
+ df_simulate_find_defs (insn, merge_set);
+ if (bitmap_intersect_p (merge_set, test_use)
+ || bitmap_intersect_p (merge_use, test_set))
+ break;
+#ifdef HAVE_cc0
+ if (!sets_cc0_p (insn))
+#endif
+ max_to = insn;
+ }
+ next = NEXT_INSN (insn);
+ if (insn == to)
+ break;
+ }
+ if (max_to != to)
+ fail = 1;
+
+ if (max_to == NULL_RTX || (fail && pmove_upto == NULL))
+ goto out;
+
+ /* Now, lower this upper bound by also taking into account that
+ a range of insns moved across ACROSS must not leave a register
+ live at the end that will be clobbered in ACROSS. We need to
+ find a point where TEST_SET & LIVE == 0.
+
+ Insns in the MERGE range that set registers which are also set
+ in the ACROSS range may still be moved as long as we also move
+ later insns which use the results of the set, and make the
+ register dead again. This is verified by the condition stated
+ above. We only need to test it for registers that are set in
+ the moved region.
+
+ MERGE_LIVE is provided by the caller and holds live registers after
+ TO. */
+ bitmap_copy (local_merge_live, merge_live);
+ for (insn = to; insn != max_to; insn = PREV_INSN (insn))
+ df_simulate_one_insn_backwards (merge_bb, insn, local_merge_live);
+
+ /* We're not interested in registers that aren't set in the moved
+ region at all. */
+ bitmap_and_into (local_merge_live, merge_set);
+ for (;;)
+ {
+ if (NONDEBUG_INSN_P (insn))
+ {
+ if (!bitmap_intersect_p (test_set, local_merge_live)
+#ifdef HAVE_cc0
+ && !sets_cc0_p (insn)
+#endif
+ )
+ {
+ max_to = insn;
+ break;
+ }
+
+ df_simulate_one_insn_backwards (merge_bb, insn,
+ local_merge_live);
+ }
+ if (insn == from)
+ {
+ fail = 1;
+ goto out;
+ }
+ insn = PREV_INSN (insn);
+ }
+
+ if (max_to != to)
+ fail = 1;
+
+ if (pmove_upto)
+ *pmove_upto = max_to;
+
+ /* For small register class machines, don't lengthen lifetimes of
+ hard registers before reload. */
+ if (! reload_completed
+ && targetm.small_register_classes_for_mode_p (VOIDmode))
+ {
+ EXECUTE_IF_SET_IN_BITMAP (merge_set, 0, i, bi)
+ {
+ if (i < FIRST_PSEUDO_REGISTER
+ && ! fixed_regs[i]
+ && ! global_regs[i])
+ fail = 1;
+ }
+ }
+
+ out:
+ BITMAP_FREE (merge_set);
+ BITMAP_FREE (merge_use);
+ BITMAP_FREE (local_merge_live);
+ BITMAP_FREE (test_set);
+ BITMAP_FREE (test_use);
+
+ return !fail;
+}
+
+\f
+/*----------------------------------------------------------------------------
+ MULTIPLE DEFINITIONS
+
+ Find the locations in the function reached by multiple definition sites
+ for a live pseudo. In and out bitvectors are built for each basic
+ block. They are restricted for efficiency to live registers.
+
+ The gen and kill sets for the problem are obvious. Together they
+ include all defined registers in a basic block; the gen set includes
+ registers where a partial or conditional or may-clobber definition is
+ last in the BB, while the kill set includes registers with a complete
+ definition coming last. However, the computation of the dataflow
+ itself is interesting.
+
+ The idea behind it comes from SSA form's iterated dominance frontier
+ criterion for inserting PHI functions. Just like in that case, we can use
+ the dominance frontier to find places where multiple definitions meet;
+ a register X defined in a basic block BB1 has multiple definitions in
+ basic blocks in BB1's dominance frontier.
+
+ So, the in-set of a basic block BB2 is not just the union of the
+ out-sets of BB2's predecessors, but includes some more bits that come
+ from the basic blocks of whose dominance frontier BB2 is part (BB1 in
+ the previous paragraph). I called this set the init-set of BB2.
+
+ (Note: I actually use the kill-set only to build the init-set.
+ gen bits are anyway propagated from BB1 to BB2 by dataflow).
+
+ For example, if you have
+
+ BB1 : r10 = 0
+ r11 = 0
+ if <...> goto BB2 else goto BB3;
+
+ BB2 : r10 = 1
+ r12 = 1
+ goto BB3;
+
+ BB3 :
+
+ you have BB3 in BB2's dominance frontier but not in BB1's, so that the
+ init-set of BB3 includes r10 and r12, but not r11. Note that we do
+ not need to iterate the dominance frontier, because we do not insert
+ anything like PHI functions there! Instead, dataflow will take care of
+ propagating the information to BB3's successors.
+ ---------------------------------------------------------------------------*/
+
+/* Private data used to verify the solution for this problem. */
+struct df_md_problem_data
+{
+ /* An obstack for the bitmaps we need for this problem. */
+ bitmap_obstack md_bitmaps;
+};
+
+/* Scratch var used by transfer functions. This is used to do md analysis
+ only for live registers. */
+static bitmap_head df_md_scratch;
+
+
+static void
+df_md_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
+ void *vbb_info)
+{
+ struct df_md_bb_info *bb_info = (struct df_md_bb_info *) vbb_info;
+ if (bb_info)
+ {
+ bitmap_clear (&bb_info->kill);
+ bitmap_clear (&bb_info->gen);
+ bitmap_clear (&bb_info->init);
+ bitmap_clear (&bb_info->in);
+ bitmap_clear (&bb_info->out);
+ }
+}
+
+
+/* Allocate or reset bitmaps for DF_MD. The solution bits are
+ not touched unless the block is new. */
+
+static void
+df_md_alloc (bitmap all_blocks)
+{
+ unsigned int bb_index;
+ bitmap_iterator bi;
+ struct df_md_problem_data *problem_data;
+
+ df_grow_bb_info (df_md);
+ if (df_md->problem_data)
+ problem_data = (struct df_md_problem_data *) df_md->problem_data;
+ else
+ {
+ problem_data = XNEW (struct df_md_problem_data);
+ df_md->problem_data = problem_data;
+ bitmap_obstack_initialize (&problem_data->md_bitmaps);
+ }
+ bitmap_initialize (&df_md_scratch, &problem_data->md_bitmaps);
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ {
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb_index);
+ /* When bitmaps are already initialized, just clear them. */
+ if (bb_info->init.obstack)
+ {
+ bitmap_clear (&bb_info->init);
+ bitmap_clear (&bb_info->gen);
+ bitmap_clear (&bb_info->kill);
+ bitmap_clear (&bb_info->in);
+ bitmap_clear (&bb_info->out);
+ }
+ else
+ {
+ bitmap_initialize (&bb_info->init, &problem_data->md_bitmaps);
+ bitmap_initialize (&bb_info->gen, &problem_data->md_bitmaps);
+ bitmap_initialize (&bb_info->kill, &problem_data->md_bitmaps);
+ bitmap_initialize (&bb_info->in, &problem_data->md_bitmaps);
+ bitmap_initialize (&bb_info->out, &problem_data->md_bitmaps);
+ }
+ }
+
+ df_md->optional_p = true;
+}
+
+/* Add the effect of the top artificial defs of BB to the multiple definitions
+ bitmap LOCAL_MD. */
+
+void
+df_md_simulate_artificial_defs_at_top (basic_block bb, bitmap local_md)
+{
+ int bb_index = bb->index;
+ df_ref *def_rec;
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ if (DF_REF_FLAGS (def)
+ & (DF_REF_PARTIAL | DF_REF_CONDITIONAL | DF_REF_MAY_CLOBBER))
+ bitmap_set_bit (local_md, dregno);
+ else
+ bitmap_clear_bit (local_md, dregno);
+ }
+ }
+}
+
+
+/* Add the effect of the defs of INSN to the reaching definitions bitmap
+ LOCAL_MD. */
+
+void
+df_md_simulate_one_insn (basic_block bb ATTRIBUTE_UNUSED, rtx insn,
+ bitmap local_md)
+{
+ unsigned uid = INSN_UID (insn);
+ df_ref *def_rec;
+
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ unsigned int dregno = DF_REF_REGNO (def);
+ if ((!(df->changeable_flags & DF_NO_HARD_REGS))
+ || (dregno >= FIRST_PSEUDO_REGISTER))
+ {
+ if (DF_REF_FLAGS (def)
+ & (DF_REF_PARTIAL | DF_REF_CONDITIONAL | DF_REF_MAY_CLOBBER))
+ bitmap_set_bit (local_md, DF_REF_ID (def));
+ else
+ bitmap_clear_bit (local_md, DF_REF_ID (def));
+ }
+ }
+}
+
+static void
+df_md_bb_local_compute_process_def (struct df_md_bb_info *bb_info,
+ df_ref *def_rec,
+ int top_flag)
+{
+ df_ref def;
+ bitmap_clear (&seen_in_insn);
+
+ while ((def = *def_rec++) != NULL)
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ if (((!(df->changeable_flags & DF_NO_HARD_REGS))
+ || (dregno >= FIRST_PSEUDO_REGISTER))
+ && top_flag == (DF_REF_FLAGS (def) & DF_REF_AT_TOP))
+ {
+ if (!bitmap_bit_p (&seen_in_insn, dregno))
+ {
+ if (DF_REF_FLAGS (def)
+ & (DF_REF_PARTIAL | DF_REF_CONDITIONAL | DF_REF_MAY_CLOBBER))
+ {
+ bitmap_set_bit (&bb_info->gen, dregno);
+ bitmap_clear_bit (&bb_info->kill, dregno);
+ }
+ else
+ {
+ /* When we find a clobber and a regular def,
+ make sure the regular def wins. */
+ bitmap_set_bit (&seen_in_insn, dregno);
+ bitmap_set_bit (&bb_info->kill, dregno);
+ bitmap_clear_bit (&bb_info->gen, dregno);
+ }
+ }
+ }
+ }
+}
+
+
+/* Compute local multiple def info for basic block BB. */
+
+static void
+df_md_bb_local_compute (unsigned int bb_index)
+{
+ basic_block bb = BASIC_BLOCK (bb_index);
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb_index);
+ rtx insn;
+
+ /* Artificials are only hard regs. */
+ if (!(df->changeable_flags & DF_NO_HARD_REGS))
+ df_md_bb_local_compute_process_def (bb_info,
+ df_get_artificial_defs (bb_index),
+ DF_REF_AT_TOP);
+
+ FOR_BB_INSNS (bb, insn)
+ {
+ unsigned int uid = INSN_UID (insn);
+ if (!INSN_P (insn))
+ continue;
+
+ df_md_bb_local_compute_process_def (bb_info, DF_INSN_UID_DEFS (uid), 0);
+ }
+
+ if (!(df->changeable_flags & DF_NO_HARD_REGS))
+ df_md_bb_local_compute_process_def (bb_info,
+ df_get_artificial_defs (bb_index),
+ 0);
+}
+
+/* Compute local reaching def info for each basic block within BLOCKS. */
+
+static void
+df_md_local_compute (bitmap all_blocks)
+{
+ unsigned int bb_index, df_bb_index;
+ bitmap_iterator bi1, bi2;
+ basic_block bb;
+ bitmap_head *frontiers;
+
+ bitmap_initialize (&seen_in_insn, &bitmap_default_obstack);
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi1)
+ {
+ df_md_bb_local_compute (bb_index);
+ }
+
+ bitmap_clear (&seen_in_insn);
+
+ frontiers = XNEWVEC (bitmap_head, last_basic_block);
+ FOR_ALL_BB (bb)
+ bitmap_initialize (&frontiers[bb->index], &bitmap_default_obstack);
+
+ compute_dominance_frontiers (frontiers);
+
+ /* Add each basic block's kills to the nodes in the frontier of the BB. */
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi1)
+ {
+ bitmap kill = &df_md_get_bb_info (bb_index)->kill;
+ EXECUTE_IF_SET_IN_BITMAP (&frontiers[bb_index], 0, df_bb_index, bi2)
+ {
+ basic_block bb = BASIC_BLOCK (df_bb_index);
+ if (bitmap_bit_p (all_blocks, df_bb_index))
+ bitmap_ior_and_into (&df_md_get_bb_info (df_bb_index)->init, kill,
+ df_get_live_in (bb));
+ }
+ }
+
+ FOR_ALL_BB (bb)
+ bitmap_clear (&frontiers[bb->index]);
+ free (frontiers);
+}
+
+
+/* Reset the global solution for recalculation. */
+
+static void
+df_md_reset (bitmap all_blocks)
+{
+ unsigned int bb_index;
+ bitmap_iterator bi;
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ {
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb_index);
+ gcc_assert (bb_info);
+ bitmap_clear (&bb_info->in);
+ bitmap_clear (&bb_info->out);
+ }
+}
+
+static bool
+df_md_transfer_function (int bb_index)
+{
+ basic_block bb = BASIC_BLOCK (bb_index);
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb_index);
+ bitmap in = &bb_info->in;
+ bitmap out = &bb_info->out;
+ bitmap gen = &bb_info->gen;
+ bitmap kill = &bb_info->kill;
+
+ /* We need to use a scratch set here so that the value returned from this
+ function invocation properly reflects whether the sets changed in a
+ significant way; i.e. not just because the live set was anded in. */
+ bitmap_and (&df_md_scratch, gen, df_get_live_out (bb));
+
+ /* Multiple definitions of a register are not relevant if it is not
+ live. Thus we trim the result to the places where it is live. */
+ bitmap_and_into (in, df_get_live_in (bb));
+
+ return bitmap_ior_and_compl (out, &df_md_scratch, in, kill);
+}
+
+/* Initialize the solution bit vectors for problem. */
+
+static void
+df_md_init (bitmap all_blocks)
+{
+ unsigned int bb_index;
+ bitmap_iterator bi;
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ {
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb_index);
+
+ bitmap_copy (&bb_info->in, &bb_info->init);
+ df_md_transfer_function (bb_index);
+ }
+}
+
+static void
+df_md_confluence_0 (basic_block bb)
+{
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb->index);
+ bitmap_copy (&bb_info->in, &bb_info->init);
+}
+
+/* In of target gets or of out of source. */
+
+static bool
+df_md_confluence_n (edge e)
+{
+ bitmap op1 = &df_md_get_bb_info (e->dest->index)->in;
+ bitmap op2 = &df_md_get_bb_info (e->src->index)->out;
+
+ if (e->flags & EDGE_FAKE)
+ return false;
+
+ if (e->flags & EDGE_EH)
+ return bitmap_ior_and_compl_into (op1, op2,
+ regs_invalidated_by_call_regset);
+ else
+ return bitmap_ior_into (op1, op2);
+}
+
+/* Free all storage associated with the problem. */
+
+static void
+df_md_free (void)
+{
+ struct df_md_problem_data *problem_data
+ = (struct df_md_problem_data *) df_md->problem_data;
+
+ bitmap_obstack_release (&problem_data->md_bitmaps);
+ free (problem_data);
+ df_md->problem_data = NULL;
+
+ df_md->block_info_size = 0;
+ free (df_md->block_info);
+ df_md->block_info = NULL;
+ free (df_md);
+}
+
+
+/* Debugging info at top of bb. */
+
+static void
+df_md_top_dump (basic_block bb, FILE *file)
+{
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb->index);
+ if (!bb_info)
+ return;
+
+ fprintf (file, ";; md in \t");
+ df_print_regset (file, &bb_info->in);
+ fprintf (file, ";; md init \t");
+ df_print_regset (file, &bb_info->init);
+ fprintf (file, ";; md gen \t");
+ df_print_regset (file, &bb_info->gen);
+ fprintf (file, ";; md kill \t");
+ df_print_regset (file, &bb_info->kill);
+}
+
+/* Debugging info at bottom of bb. */
+
+static void
+df_md_bottom_dump (basic_block bb, FILE *file)
+{
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb->index);
+ if (!bb_info)
+ return;
+
+ fprintf (file, ";; md out \t");
+ df_print_regset (file, &bb_info->out);
+}
+
+static struct df_problem problem_MD =
+{
+ DF_MD, /* Problem id. */
+ DF_FORWARD, /* Direction. */
+ df_md_alloc, /* Allocate the problem specific data. */
+ df_md_reset, /* Reset global information. */
+ df_md_free_bb_info, /* Free basic block info. */
+ df_md_local_compute, /* Local compute function. */
+ df_md_init, /* Init the solution specific data. */
+ df_worklist_dataflow, /* Worklist solver. */
+ df_md_confluence_0, /* Confluence operator 0. */
+ df_md_confluence_n, /* Confluence operator n. */
+ df_md_transfer_function, /* Transfer function. */
+ NULL, /* Finalize function. */
+ df_md_free, /* Free all of the problem information. */
+ df_md_free, /* Remove this problem from the stack of dataflow problems. */
+ NULL, /* Debugging. */
+ df_md_top_dump, /* Debugging start block. */
+ df_md_bottom_dump, /* Debugging end block. */
+ NULL, /* Incremental solution verify start. */
+ NULL, /* Incremental solution verify end. */
+ NULL, /* Dependent problem. */
+ sizeof (struct df_md_bb_info),/* Size of entry of block_info array. */
+ TV_DF_MD, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
+};
+
+/* Create a new MD instance and add it to the existing instance
+ of DF. */
+
+void
+df_md_add_problem (void)
+{
+ df_add_problem (&problem_MD);
+}
+
+
+