/* Copy propagation on hard registers for the GNU compiler.
- Copyright (C) 2000-2014 Free Software Foundation, Inc.
+ Copyright (C) 2000-2015 Free Software Foundation, Inc.
This file is part of GCC.
#include "config.h"
#include "system.h"
#include "coretypes.h"
-#include "tm.h"
+#include "backend.h"
#include "rtl.h"
+#include "df.h"
#include "tm_p.h"
#include "insn-config.h"
#include "regs.h"
#include "addresses.h"
-#include "hard-reg-set.h"
-#include "basic-block.h"
#include "reload.h"
-#include "function.h"
#include "recog.h"
#include "flags.h"
#include "diagnostic-core.h"
-#include "obstack.h"
#include "tree-pass.h"
-#include "df.h"
+#include "rtl-iter.h"
+#include "emit-rtl.h"
/* The following code does forward propagation of hard register copies.
The object is to eliminate as many dependencies as possible, so that
struct queued_debug_insn_change
{
struct queued_debug_insn_change *next;
- rtx insn;
+ rtx_insn *insn;
rtx *loc;
rtx new_rtx;
};
struct value_data_entry
{
- enum machine_mode mode;
+ machine_mode mode;
unsigned int oldest_regno;
unsigned int next_regno;
struct queued_debug_insn_change *debug_insn_changes;
unsigned int n_debug_insn_changes;
};
-static alloc_pool debug_insn_changes_pool;
+static object_allocator<queued_debug_insn_change> queued_debug_insn_change_pool
+ ("debug insn changes pool", 256);
+
static bool skip_debug_insn_p;
static void kill_value_one_regno (unsigned, struct value_data *);
static void kill_value_regno (unsigned, unsigned, struct value_data *);
-static void kill_value (rtx, struct value_data *);
-static void set_value_regno (unsigned, enum machine_mode, struct value_data *);
+static void kill_value (const_rtx, struct value_data *);
+static void set_value_regno (unsigned, machine_mode, struct value_data *);
static void init_value_data (struct value_data *);
static void kill_clobbered_value (rtx, const_rtx, void *);
static void kill_set_value (rtx, const_rtx, void *);
-static int kill_autoinc_value (rtx *, void *);
static void copy_value (rtx, rtx, struct value_data *);
-static bool mode_change_ok (enum machine_mode, enum machine_mode,
+static bool mode_change_ok (machine_mode, machine_mode,
unsigned int);
-static rtx maybe_mode_change (enum machine_mode, enum machine_mode,
- enum machine_mode, unsigned int, unsigned int);
+static rtx maybe_mode_change (machine_mode, machine_mode,
+ machine_mode, unsigned int, unsigned int);
static rtx find_oldest_value_reg (enum reg_class, rtx, struct value_data *);
-static bool replace_oldest_value_reg (rtx *, enum reg_class, rtx,
+static bool replace_oldest_value_reg (rtx *, enum reg_class, rtx_insn *,
struct value_data *);
static bool replace_oldest_value_addr (rtx *, enum reg_class,
- enum machine_mode, addr_space_t, rtx,
- struct value_data *);
-static bool replace_oldest_value_mem (rtx, rtx, struct value_data *);
+ machine_mode, addr_space_t,
+ rtx_insn *, struct value_data *);
+static bool replace_oldest_value_mem (rtx, rtx_insn *, struct value_data *);
static bool copyprop_hardreg_forward_1 (basic_block, struct value_data *);
extern void debug_value_data (struct value_data *);
#ifdef ENABLE_CHECKING
{
next = cur->next;
--vd->n_debug_insn_changes;
- pool_free (debug_insn_changes_pool, cur);
+ queued_debug_insn_change_pool.remove (cur);
}
vd->e[regno].debug_insn_changes = NULL;
}
so that we mind the mode the register is in. */
static void
-kill_value (rtx x, struct value_data *vd)
+kill_value (const_rtx x, struct value_data *vd)
{
- rtx orig_rtx = x;
-
if (GET_CODE (x) == SUBREG)
{
- x = simplify_subreg (GET_MODE (x), SUBREG_REG (x),
- GET_MODE (SUBREG_REG (x)), SUBREG_BYTE (x));
- if (x == NULL_RTX)
- x = SUBREG_REG (orig_rtx);
+ rtx tmp = simplify_subreg (GET_MODE (x), SUBREG_REG (x),
+ GET_MODE (SUBREG_REG (x)), SUBREG_BYTE (x));
+ x = tmp ? tmp : SUBREG_REG (x);
}
if (REG_P (x))
- {
- unsigned int regno = REGNO (x);
- unsigned int n = hard_regno_nregs[regno][GET_MODE (x)];
-
- kill_value_regno (regno, n, vd);
- }
+ kill_value_regno (REGNO (x), REG_NREGS (x), vd);
}
/* Remember that REGNO is valid in MODE. */
static void
-set_value_regno (unsigned int regno, enum machine_mode mode,
+set_value_regno (unsigned int regno, machine_mode mode,
struct value_data *vd)
{
unsigned int nregs;
}
}
-/* Called through for_each_rtx. Kill any register used as the base of an
- auto-increment expression, and install that register as the root of its
- own value list. */
+/* Kill any register used in X as the base of an auto-increment expression,
+ and install that register as the root of its own value list. */
-static int
-kill_autoinc_value (rtx *px, void *data)
+static void
+kill_autoinc_value (rtx_insn *insn, struct value_data *vd)
{
- rtx x = *px;
- struct value_data *const vd = (struct value_data *) data;
-
- if (GET_RTX_CLASS (GET_CODE (x)) == RTX_AUTOINC)
+ subrtx_iterator::array_type array;
+ FOR_EACH_SUBRTX (iter, array, PATTERN (insn), NONCONST)
{
- x = XEXP (x, 0);
- kill_value (x, vd);
- set_value_regno (REGNO (x), GET_MODE (x), vd);
- return -1;
+ const_rtx x = *iter;
+ if (GET_RTX_CLASS (GET_CODE (x)) == RTX_AUTOINC)
+ {
+ x = XEXP (x, 0);
+ kill_value (x, vd);
+ set_value_regno (REGNO (x), GET_MODE (x), vd);
+ iter.skip_subrtxes ();
+ }
}
-
- return 0;
}
/* Assert that SRC has been copied to DEST. Adjust the data structures
return;
/* If SRC and DEST overlap, don't record anything. */
- dn = hard_regno_nregs[dr][GET_MODE (dest)];
- sn = hard_regno_nregs[sr][GET_MODE (dest)];
+ dn = REG_NREGS (dest);
+ sn = REG_NREGS (src);
if ((dr > sr && dr < sr + sn)
|| (sr > dr && sr < dr + dn))
return;
we must not do the same for the high part.
Note we can still get low parts for the same mode combination through
a two-step copy involving differently sized hard regs.
- Assume hard regs fr* are 32 bits bits each, while r* are 64 bits each:
+ Assume hard regs fr* are 32 bits each, while r* are 64 bits each:
(set (reg:DI r0) (reg:DI fr0))
(set (reg:SI fr2) (reg:SI r0))
loads the low part of (reg:DI fr0) - i.e. fr1 - into fr2, while:
/* Return true if a mode change from ORIG to NEW is allowed for REGNO. */
static bool
-mode_change_ok (enum machine_mode orig_mode, enum machine_mode new_mode,
+mode_change_ok (machine_mode orig_mode, machine_mode new_mode,
unsigned int regno ATTRIBUTE_UNUSED)
{
if (GET_MODE_SIZE (orig_mode) < GET_MODE_SIZE (new_mode))
Return a NEW_MODE rtx for REGNO if that's OK, otherwise return NULL_RTX. */
static rtx
-maybe_mode_change (enum machine_mode orig_mode, enum machine_mode copy_mode,
- enum machine_mode new_mode, unsigned int regno,
+maybe_mode_change (machine_mode orig_mode, machine_mode copy_mode,
+ machine_mode new_mode, unsigned int regno,
unsigned int copy_regno ATTRIBUTE_UNUSED)
{
if (GET_MODE_SIZE (copy_mode) < GET_MODE_SIZE (orig_mode)
return NULL_RTX;
if (orig_mode == new_mode)
- return gen_rtx_raw_REG (new_mode, regno);
+ return gen_raw_REG (new_mode, regno);
else if (mode_change_ok (orig_mode, new_mode, regno))
{
int copy_nregs = hard_regno_nregs[copy_regno][copy_mode];
+ (BYTES_BIG_ENDIAN ? byteoffset : 0));
regno += subreg_regno_offset (regno, orig_mode, offset, new_mode);
if (HARD_REGNO_MODE_OK (regno, new_mode))
- return gen_rtx_raw_REG (new_mode, regno);
+ return gen_raw_REG (new_mode, regno);
}
return NULL_RTX;
}
find_oldest_value_reg (enum reg_class cl, rtx reg, struct value_data *vd)
{
unsigned int regno = REGNO (reg);
- enum machine_mode mode = GET_MODE (reg);
+ machine_mode mode = GET_MODE (reg);
unsigned int i;
/* If we are accessing REG in some mode other that what we set it in,
for (i = vd->e[regno].oldest_regno; i != regno; i = vd->e[i].next_regno)
{
- enum machine_mode oldmode = vd->e[i].mode;
+ machine_mode oldmode = vd->e[i].mode;
rtx new_rtx;
if (!in_hard_reg_set_p (reg_class_contents[cl], mode, i))
in register class CL. Return true if successfully replaced. */
static bool
-replace_oldest_value_reg (rtx *loc, enum reg_class cl, rtx insn,
+replace_oldest_value_reg (rtx *loc, enum reg_class cl, rtx_insn *insn,
struct value_data *vd)
{
rtx new_rtx = find_oldest_value_reg (cl, *loc, vd);
fprintf (dump_file, "debug_insn %u: queued replacing reg %u with %u\n",
INSN_UID (insn), REGNO (*loc), REGNO (new_rtx));
- change = (struct queued_debug_insn_change *)
- pool_alloc (debug_insn_changes_pool);
+ change = queued_debug_insn_change_pool.allocate ();
change->next = vd->e[REGNO (new_rtx)].debug_insn_changes;
change->insn = insn;
change->loc = loc;
static bool
replace_oldest_value_addr (rtx *loc, enum reg_class cl,
- enum machine_mode mode, addr_space_t as,
- rtx insn, struct value_data *vd)
+ machine_mode mode, addr_space_t as,
+ rtx_insn *insn, struct value_data *vd)
{
rtx x = *loc;
RTX_CODE code = GET_CODE (x);
/* Similar to replace_oldest_value_reg, but X contains a memory. */
static bool
-replace_oldest_value_mem (rtx x, rtx insn, struct value_data *vd)
+replace_oldest_value_mem (rtx x, rtx_insn *insn, struct value_data *vd)
{
enum reg_class cl;
apply_debug_insn_changes (struct value_data *vd, unsigned int regno)
{
struct queued_debug_insn_change *change;
- rtx last_insn = vd->e[regno].debug_insn_changes->insn;
+ rtx_insn *last_insn = vd->e[regno].debug_insn_changes->insn;
for (change = vd->e[regno].debug_insn_changes;
change;
apply_change_group ();
}
-/* Called via for_each_rtx, for all used registers in a real
- insn apply DEBUG_INSN changes that change registers to the
- used register. */
+/* Called via note_uses, for all used registers in a real insn
+ apply DEBUG_INSN changes that change registers to the used
+ registers. */
-static int
-cprop_find_used_regs_1 (rtx *loc, void *data)
+static void
+cprop_find_used_regs (rtx *loc, void *data)
{
- if (REG_P (*loc))
+ struct value_data *const vd = (struct value_data *) data;
+ subrtx_iterator::array_type array;
+ FOR_EACH_SUBRTX (iter, array, *loc, NONCONST)
{
- struct value_data *vd = (struct value_data *) data;
- if (vd->e[REGNO (*loc)].debug_insn_changes)
+ const_rtx x = *iter;
+ if (REG_P (x))
{
- apply_debug_insn_changes (vd, REGNO (*loc));
- free_debug_insn_changes (vd, REGNO (*loc));
+ unsigned int regno = REGNO (x);
+ if (vd->e[regno].debug_insn_changes)
+ {
+ apply_debug_insn_changes (vd, regno);
+ free_debug_insn_changes (vd, regno);
+ }
}
}
- return 0;
}
-/* Called via note_uses, for all used registers in a real insn
- apply DEBUG_INSN changes that change registers to the used
- registers. */
+/* Apply clobbers of INSN in PATTERN and C_I_F_U to value_data VD. */
static void
-cprop_find_used_regs (rtx *loc, void *vd)
+kill_clobbered_values (rtx_insn *insn, struct value_data *vd)
{
- for_each_rtx (loc, cprop_find_used_regs_1, vd);
+ note_stores (PATTERN (insn), kill_clobbered_value, vd);
+
+ if (CALL_P (insn))
+ {
+ rtx exp;
+
+ for (exp = CALL_INSN_FUNCTION_USAGE (insn); exp; exp = XEXP (exp, 1))
+ {
+ rtx x = XEXP (exp, 0);
+ if (GET_CODE (x) == CLOBBER)
+ kill_value (SET_DEST (x), vd);
+ }
+ }
}
/* Perform the forward copy propagation on basic block BB. */
copyprop_hardreg_forward_1 (basic_block bb, struct value_data *vd)
{
bool anything_changed = false;
- rtx insn;
+ rtx_insn *insn;
for (insn = BB_HEAD (bb); ; insn = NEXT_INSN (insn))
{
- int n_ops, i, alt, predicated;
+ int n_ops, i, predicated;
bool is_asm, any_replacements;
rtx set;
rtx link;
}
set = single_set (insn);
- extract_insn (insn);
- if (! constrain_operands (1))
- fatal_insn_not_found (insn);
- preprocess_constraints ();
- alt = which_alternative;
+ extract_constrain_insn (insn);
+ preprocess_constraints (insn);
+ const operand_alternative *op_alt = which_op_alt ();
n_ops = recog_data.n_operands;
is_asm = asm_noperands (PATTERN (insn)) >= 0;
- /* Simplify the code below by rewriting things to reflect
- matching constraints. Also promote OP_OUT to OP_INOUT
+ /* Simplify the code below by promoting OP_OUT to OP_INOUT
in predicated instructions. */
predicated = GET_CODE (PATTERN (insn)) == COND_EXEC;
for (i = 0; i < n_ops; ++i)
{
- int matches = recog_op_alt[i][alt].matches;
- if (matches >= 0)
- recog_op_alt[i][alt].cl = recog_op_alt[matches][alt].cl;
- if (matches >= 0 || recog_op_alt[i][alt].matched >= 0
+ int matches = op_alt[i].matches;
+ if (matches >= 0 || op_alt[i].matched >= 0
|| (predicated && recog_data.operand_type[i] == OP_OUT))
recog_data.operand_type[i] = OP_INOUT;
}
/* For each earlyclobber operand, zap the value data. */
for (i = 0; i < n_ops; i++)
- if (recog_op_alt[i][alt].earlyclobber)
+ if (op_alt[i].earlyclobber)
kill_value (recog_data.operand[i], vd);
/* Within asms, a clobber cannot overlap inputs or outputs.
I wouldn't think this were true for regular insns, but
scan_rtx treats them like that... */
- note_stores (PATTERN (insn), kill_clobbered_value, vd);
+ kill_clobbered_values (insn, vd);
/* Kill all auto-incremented values. */
/* ??? REG_INC is useless, since stack pushes aren't done that way. */
- for_each_rtx (&PATTERN (insn), kill_autoinc_value, vd);
+ kill_autoinc_value (insn, vd);
/* Kill all early-clobbered operands. */
for (i = 0; i < n_ops; i++)
- if (recog_op_alt[i][alt].earlyclobber)
+ if (op_alt[i].earlyclobber)
kill_value (recog_data.operand[i], vd);
/* If we have dead sets in the insn, then we need to note these as we
{
rtx src = SET_SRC (set);
unsigned int regno = REGNO (src);
- enum machine_mode mode = GET_MODE (src);
+ machine_mode mode = GET_MODE (src);
unsigned int i;
rtx new_rtx;
}
/* We need to re-extract as validate_change clobbers
recog_data. */
- extract_insn (insn);
- if (! constrain_operands (1))
- fatal_insn_not_found (insn);
- preprocess_constraints ();
+ extract_constrain_insn (insn);
+ preprocess_constraints (insn);
}
/* Otherwise, try all valid registers and see if its valid. */
}
/* We need to re-extract as validate_change clobbers
recog_data. */
- extract_insn (insn);
- if (! constrain_operands (1))
- fatal_insn_not_found (insn);
- preprocess_constraints ();
+ extract_constrain_insn (insn);
+ preprocess_constraints (insn);
}
}
}
if (recog_data.operand_type[i] == OP_IN)
{
- if (recog_op_alt[i][alt].is_address)
+ if (op_alt[i].is_address)
replaced[i]
= replace_oldest_value_addr (recog_data.operand_loc[i],
- recog_op_alt[i][alt].cl,
+ alternative_class (op_alt, i),
VOIDmode, ADDR_SPACE_GENERIC,
insn, vd);
else if (REG_P (recog_data.operand[i]))
replaced[i]
= replace_oldest_value_reg (recog_data.operand_loc[i],
- recog_op_alt[i][alt].cl,
+ alternative_class (op_alt, i),
insn, vd);
else if (MEM_P (recog_data.operand[i]))
replaced[i] = replace_oldest_value_mem (recog_data.operand[i],
unsigned int set_nregs = 0;
unsigned int regno;
rtx exp;
+ HARD_REG_SET regs_invalidated_by_this_call;
for (exp = CALL_INSN_FUNCTION_USAGE (insn); exp; exp = XEXP (exp, 1))
{
copy_value (dest, SET_SRC (x), vd);
ksvd.ignore_set_reg = dest;
set_regno = REGNO (dest);
- set_nregs
- = hard_regno_nregs[set_regno][GET_MODE (dest)];
+ set_nregs = REG_NREGS (dest);
break;
}
}
+ get_call_reg_set_usage (insn,
+ ®s_invalidated_by_this_call,
+ regs_invalidated_by_call);
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
- if ((TEST_HARD_REG_BIT (regs_invalidated_by_call, regno)
+ if ((TEST_HARD_REG_BIT (regs_invalidated_by_this_call, regno)
|| HARD_REGNO_CALL_PART_CLOBBERED (regno, vd->e[regno].mode))
&& (regno < set_regno || regno >= set_regno + set_nregs))
kill_value_regno (regno, 1, vd);
but instead among CLOBBERs on the CALL_INSN, we could wrongly
assume the value in it is still live. */
if (ksvd.ignore_set_reg)
- note_stores (PATTERN (insn), kill_clobbered_value, vd);
+ kill_clobbered_values (insn, vd);
}
- /* Notice stores. */
- note_stores (PATTERN (insn), kill_set_value, &ksvd);
+ bool copy_p = (set
+ && REG_P (SET_DEST (set))
+ && REG_P (SET_SRC (set)));
+ bool noop_p = (copy_p
+ && rtx_equal_p (SET_DEST (set), SET_SRC (set)));
- /* Notice copies. */
- if (set && REG_P (SET_DEST (set)) && REG_P (SET_SRC (set)))
- copy_value (SET_DEST (set), SET_SRC (set), vd);
+ if (!noop_p)
+ {
+ /* Notice stores. */
+ note_stores (PATTERN (insn), kill_set_value, &ksvd);
+
+ /* Notice copies. */
+ if (copy_p)
+ copy_value (SET_DEST (set), SET_SRC (set), vd);
+ }
if (insn == BB_END (bb))
break;
RTL_PASS, /* type */
"cprop_hardreg", /* name */
OPTGROUP_NONE, /* optinfo_flags */
- true, /* has_execute */
TV_CPROP_REGISTERS, /* tv_id */
0, /* properties_required */
0, /* properties_provided */
visited = sbitmap_alloc (last_basic_block_for_fn (fun));
bitmap_clear (visited);
- if (MAY_HAVE_DEBUG_INSNS)
- debug_insn_changes_pool
- = create_alloc_pool ("debug insn changes pool",
- sizeof (struct queued_debug_insn_change), 256);
-
FOR_EACH_BB_FN (bb, fun)
{
bitmap_set_bit (visited, bb->index);
}
}
- free_alloc_pool (debug_insn_changes_pool);
+ queued_debug_insn_change_pool.release ();
}
sbitmap_free (visited);
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