-/* Convert RTL to assembler code and output it, for GNU compiler.
- Copyright (C) 1987, 88, 89, 92, 93, 1994 Free Software Foundation, Inc.
-
-This file is part of GNU CC.
-
-GNU CC 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 version.
-
-GNU CC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-
-/* This is the final pass of the compiler.
- It looks at the rtl code for a function and outputs assembler code.
-
- Call `final_start_function' to output the assembler code for function entry,
- `final' to output assembler code for some RTL code,
- `final_end_function' to output assembler code for function exit.
- If a function is compiled in several pieces, each piece is
- output separately with `final'.
-
- Some optimizations are also done at this level.
- Move instructions that were made unnecessary by good register allocation
- are detected and omitted from the output. (Though most of these
- are removed by the last jump pass.)
-
- Instructions to set the condition codes are omitted when it can be
- seen that the condition codes already had the desired values.
-
- In some cases it is sufficient if the inherited condition codes
- have related values, but this may require the following insn
- (the one that tests the condition codes) to be modified.
-
- The code for the function prologue and epilogue are generated
- directly as assembler code by the macros FUNCTION_PROLOGUE and
- FUNCTION_EPILOGUE. Those instructions never exist as rtl. */
-
-#include "config.h"
-#ifdef __STDC__
-#include <stdarg.h>
-#else
-#include <varargs.h>
-#endif
-#include <stdio.h>
-#include <ctype.h>
-
-#include "tree.h"
-#include "rtl.h"
-#include "regs.h"
-#include "insn-config.h"
-#include "insn-flags.h"
-#include "insn-attr.h"
-#include "insn-codes.h"
-#include "recog.h"
-#include "conditions.h"
-#include "flags.h"
-#include "real.h"
-#include "hard-reg-set.h"
-#include "defaults.h"
-#include "output.h"
-
-/* Get N_SLINE and N_SOL from stab.h if we can expect the file to exist. */
-#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
-#if defined (USG) || defined (NO_STAB_H)
-#include "gstab.h" /* If doing DBX on sysV, use our own stab.h. */
-#else
-#include <stab.h> /* On BSD, use the system's stab.h. */
-#endif /* not USG */
-#endif /* DBX_DEBUGGING_INFO || XCOFF_DEBUGGING_INFO */
-
-#ifdef XCOFF_DEBUGGING_INFO
-#include "xcoffout.h"
-#endif
-
-/* .stabd code for line number. */
-#ifndef N_SLINE
-#define N_SLINE 0x44
-#endif
-
-/* .stabs code for included file name. */
-#ifndef N_SOL
-#define N_SOL 0x84
-#endif
-
-#ifndef INT_TYPE_SIZE
-#define INT_TYPE_SIZE BITS_PER_WORD
-#endif
-
-/* If we aren't using cc0, CC_STATUS_INIT shouldn't exist. So define a
- null default for it to save conditionalization later. */
-#ifndef CC_STATUS_INIT
-#define CC_STATUS_INIT
-#endif
-
-/* How to start an assembler comment. */
-#ifndef ASM_COMMENT_START
-#define ASM_COMMENT_START ";#"
-#endif
-
-/* Is the given character a logical line separator for the assembler? */
-#ifndef IS_ASM_LOGICAL_LINE_SEPARATOR
-#define IS_ASM_LOGICAL_LINE_SEPARATOR(C) ((C) == ';')
-#endif
-
-/* Nonzero means this function is a leaf function, with no function calls.
- This variable exists to be examined in FUNCTION_PROLOGUE
- and FUNCTION_EPILOGUE. Always zero, unless set by some action. */
-int leaf_function;
-
-/* Last insn processed by final_scan_insn. */
-static rtx debug_insn = 0;
-
-/* Line number of last NOTE. */
-static int last_linenum;
-
-/* Filename of last NOTE. */
-static char *last_filename;
-
-/* Number of basic blocks seen so far;
- used if profile_block_flag is set. */
-static int count_basic_blocks;
-
-/* Nonzero while outputting an `asm' with operands.
- This means that inconsistencies are the user's fault, so don't abort.
- The precise value is the insn being output, to pass to error_for_asm. */
-static rtx this_is_asm_operands;
-
-/* Number of operands of this insn, for an `asm' with operands. */
-static int insn_noperands;
-
-/* Compare optimization flag. */
-
-static rtx last_ignored_compare = 0;
-
-/* Flag indicating this insn is the start of a new basic block. */
-
-static int new_block = 1;
-
-/* All the symbol-blocks (levels of scoping) in the compilation
- are assigned sequence numbers in order of appearance of the
- beginnings of the symbol-blocks. Both final and dbxout do this,
- and assume that they will both give the same number to each block.
- Final uses these sequence numbers to generate assembler label names
- LBBnnn and LBEnnn for the beginning and end of the symbol-block.
- Dbxout uses the sequence numbers to generate references to the same labels
- from the dbx debugging information.
-
- Sdb records this level at the beginning of each function,
- in order to find the current level when recursing down declarations.
- It outputs the block beginning and endings
- at the point in the asm file where the blocks would begin and end. */
-
-int next_block_index;
-
-/* Assign a unique number to each insn that is output.
- This can be used to generate unique local labels. */
-
-static int insn_counter = 0;
-
-#ifdef HAVE_cc0
-/* This variable contains machine-dependent flags (defined in tm.h)
- set and examined by output routines
- that describe how to interpret the condition codes properly. */
-
-CC_STATUS cc_status;
-
-/* During output of an insn, this contains a copy of cc_status
- from before the insn. */
-
-CC_STATUS cc_prev_status;
-#endif
-
-/* Indexed by hardware reg number, is 1 if that register is ever
- used in the current function.
-
- In life_analysis, or in stupid_life_analysis, this is set
- up to record the hard regs used explicitly. Reload adds
- in the hard regs used for holding pseudo regs. Final uses
- it to generate the code in the function prologue and epilogue
- to save and restore registers as needed. */
-
-char regs_ever_live[FIRST_PSEUDO_REGISTER];
-
-/* Nonzero means current function must be given a frame pointer.
- Set in stmt.c if anything is allocated on the stack there.
- Set in reload1.c if anything is allocated on the stack there. */
-
-int frame_pointer_needed;
-
-/* Assign unique numbers to labels generated for profiling. */
-
-int profile_label_no;
-
-/* Length so far allocated in PENDING_BLOCKS. */
-
-static int max_block_depth;
-
-/* Stack of sequence numbers of symbol-blocks of which we have seen the
- beginning but not yet the end. Sequence numbers are assigned at
- the beginning; this stack allows us to find the sequence number
- of a block that is ending. */
-
-static int *pending_blocks;
-
-/* Number of elements currently in use in PENDING_BLOCKS. */
-
-static int block_depth;
-
-/* Nonzero if have enabled APP processing of our assembler output. */
-
-static int app_on;
-
-/* If we are outputting an insn sequence, this contains the sequence rtx.
- Zero otherwise. */
-
-rtx final_sequence;
-
-#ifdef ASSEMBLER_DIALECT
-
-/* Number of the assembler dialect to use, starting at 0. */
-static int dialect_number;
-#endif
-
-/* Indexed by line number, nonzero if there is a note for that line. */
-
-static char *line_note_exists;
-
-/* Linked list to hold line numbers for each basic block. */
-
-struct bb_list {
- struct bb_list *next; /* pointer to next basic block */
- int line_num; /* line number */
- int file_label_num; /* LPBC<n> label # for stored filename */
- int func_label_num; /* LPBC<n> label # for stored function name */
-};
-
-static struct bb_list *bb_head = 0; /* Head of basic block list */
-static struct bb_list **bb_tail = &bb_head; /* Ptr to store next bb ptr */
-static int bb_file_label_num = -1; /* Current label # for file */
-static int bb_func_label_num = -1; /* Current label # for func */
-
-/* Linked list to hold the strings for each file and function name output. */
-
-struct bb_str {
- struct bb_str *next; /* pointer to next string */
- char *string; /* string */
- int label_num; /* label number */
- int length; /* string length */
-};
-
-extern rtx peephole PROTO((rtx));
-
-static struct bb_str *sbb_head = 0; /* Head of string list. */
-static struct bb_str **sbb_tail = &sbb_head; /* Ptr to store next bb str */
-static int sbb_label_num = 0; /* Last label used */
-
-static int asm_insn_count PROTO((rtx));
-static void profile_function PROTO((FILE *));
-static void profile_after_prologue PROTO((FILE *));
-static void add_bb PROTO((FILE *));
-static int add_bb_string PROTO((char *, int));
-static void output_source_line PROTO((FILE *, rtx));
-static rtx walk_alter_subreg PROTO((rtx));
-static int alter_cond PROTO((rtx));
-static void output_operand PROTO((rtx, int));
-static void leaf_renumber_regs PROTO((rtx));
-\f
-/* Initialize data in final at the beginning of a compilation. */
-
-void
-init_final (filename)
- char *filename;
-{
- next_block_index = 2;
- app_on = 0;
- max_block_depth = 20;
- pending_blocks = (int *) xmalloc (20 * sizeof *pending_blocks);
- final_sequence = 0;
-
-#ifdef ASSEMBLER_DIALECT
- dialect_number = ASSEMBLER_DIALECT;
-#endif
-}
-
-/* Called at end of source file,
- to output the block-profiling table for this entire compilation. */
-
-void
-end_final (filename)
- char *filename;
-{
- int i;
-
- if (profile_block_flag)
- {
- char name[20];
- int align = exact_log2 (BIGGEST_ALIGNMENT / BITS_PER_UNIT);
- int size = (INT_TYPE_SIZE / BITS_PER_UNIT) * count_basic_blocks;
- int rounded = size;
- struct bb_list *ptr;
- struct bb_str *sptr;
-
- rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
- rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
- * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
-
- data_section ();
-
- /* Output the main header, of 10 words:
- 0: 1 if this file's initialized, else 0.
- 1: address of file name (LPBX1).
- 2: address of table of counts (LPBX2).
- 3: number of counts in the table.
- 4: always 0, for compatibility with Sun.
-
- The following are GNU extensions:
-
- 5: address of table of start addrs of basic blocks (LPBX3).
- 6: Number of bytes in this header.
- 7: address of table of function names (LPBX4).
- 8: address of table of line numbers (LPBX5) or 0.
- 9: address of table of file names (LPBX6) or 0. */
-
- ASM_OUTPUT_ALIGN (asm_out_file, align);
-
- ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 0);
- /* zero word */
- assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
-
- /* address of filename */
- ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 1);
- assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
-
- /* address of count table */
- ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 2);
- assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
-
- /* count of the # of basic blocks */
- assemble_integer (GEN_INT (count_basic_blocks), UNITS_PER_WORD, 1);
-
- /* zero word (link field) */
- assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
-
- /* address of basic block start address table */
- ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 3);
- assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
-
- /* byte count for extended structure. */
- assemble_integer (GEN_INT (10 * UNITS_PER_WORD), UNITS_PER_WORD, 1);
-
- /* address of function name table */
- ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 4);
- assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
-
- /* address of line number and filename tables if debugging. */
- if (write_symbols != NO_DEBUG)
- {
- ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 5);
- assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
- ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 6);
- assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
- }
- else
- {
- assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
- assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
- }
-
- /* Output the file name changing the suffix to .d for Sun tcov
- compatibility. */
- ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 1);
- {
- int len = strlen (filename);
- char *data_file = (char *) alloca (len + 3);
- strcpy (data_file, filename);
- strip_off_ending (data_file, len);
- strcat (data_file, ".d");
- assemble_string (data_file, strlen (data_file) + 1);
- }
-
- /* Make space for the table of counts. */
- if (flag_no_common || size == 0)
- {
- /* Realign data section. */
- ASM_OUTPUT_ALIGN (asm_out_file, align);
- ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 2);
- if (size != 0)
- assemble_zeros (size);
- }
- else
- {
- ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 2);
-#ifdef ASM_OUTPUT_SHARED_LOCAL
- if (flag_shared_data)
- ASM_OUTPUT_SHARED_LOCAL (asm_out_file, name, size, rounded);
- else
-#endif
-#ifdef ASM_OUTPUT_ALIGNED_LOCAL
- ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size,
- BIGGEST_ALIGNMENT);
-#else
- ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
-#endif
- }
-
- /* Output any basic block strings */
- readonly_data_section ();
- if (sbb_head)
- {
- ASM_OUTPUT_ALIGN (asm_out_file, align);
- for (sptr = sbb_head; sptr != 0; sptr = sptr->next)
- {
- ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBC", sptr->label_num);
- assemble_string (sptr->string, sptr->length);
- }
- }
-
- /* Output the table of addresses. */
- /* Realign in new section */
- ASM_OUTPUT_ALIGN (asm_out_file, align);
- ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 3);
- for (i = 0; i < count_basic_blocks; i++)
- {
- ASM_GENERATE_INTERNAL_LABEL (name, "LPB", i);
- assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name),
- UNITS_PER_WORD, 1);
- }
-
- /* Output the table of function names. */
- ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 4);
- for ((ptr = bb_head), (i = 0); ptr != 0; (ptr = ptr->next), i++)
- {
- if (ptr->func_label_num >= 0)
- {
- ASM_GENERATE_INTERNAL_LABEL (name, "LPBC", ptr->func_label_num);
- assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name),
- UNITS_PER_WORD, 1);
- }
- else
- assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
- }
-
- for ( ; i < count_basic_blocks; i++)
- assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
-
- if (write_symbols != NO_DEBUG)
- {
- /* Output the table of line numbers. */
- ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 5);
- for ((ptr = bb_head), (i = 0); ptr != 0; (ptr = ptr->next), i++)
- assemble_integer (GEN_INT (ptr->line_num), UNITS_PER_WORD, 1);
-
- for ( ; i < count_basic_blocks; i++)
- assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
-
- /* Output the table of file names. */
- ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 6);
- for ((ptr = bb_head), (i = 0); ptr != 0; (ptr = ptr->next), i++)
- {
- if (ptr->file_label_num >= 0)
- {
- ASM_GENERATE_INTERNAL_LABEL (name, "LPBC", ptr->file_label_num);
- assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name),
- UNITS_PER_WORD, 1);
- }
- else
- assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
- }
-
- for ( ; i < count_basic_blocks; i++)
- assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
- }
-
- /* End with the address of the table of addresses,
- so we can find it easily, as the last word in the file's text. */
- ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 3);
- assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
- }
-}
-
-/* Enable APP processing of subsequent output.
- Used before the output from an `asm' statement. */
-
-void
-app_enable ()
-{
- if (! app_on)
- {
- fprintf (asm_out_file, ASM_APP_ON);
- app_on = 1;
- }
-}
-
-/* Disable APP processing of subsequent output.
- Called from varasm.c before most kinds of output. */
-
-void
-app_disable ()
-{
- if (app_on)
- {
- fprintf (asm_out_file, ASM_APP_OFF);
- app_on = 0;
- }
-}
-\f
-/* Return the number of slots filled in the current
- delayed branch sequence (we don't count the insn needing the
- delay slot). Zero if not in a delayed branch sequence. */
-
-#ifdef DELAY_SLOTS
-int
-dbr_sequence_length ()
-{
- if (final_sequence != 0)
- return XVECLEN (final_sequence, 0) - 1;
- else
- return 0;
-}
-#endif
-\f
-/* The next two pages contain routines used to compute the length of an insn
- and to shorten branches. */
-
-/* Arrays for insn lengths, and addresses. The latter is referenced by
- `insn_current_length'. */
-
-static short *insn_lengths;
-int *insn_addresses;
-
-/* Address of insn being processed. Used by `insn_current_length'. */
-int insn_current_address;
-
-/* Indicate that branch shortening hasn't yet been done. */
-
-void
-init_insn_lengths ()
-{
- insn_lengths = 0;
-}
-
-/* Obtain the current length of an insn. If branch shortening has been done,
- get its actual length. Otherwise, get its maximum length. */
-
-int
-get_attr_length (insn)
- rtx insn;
-{
-#ifdef HAVE_ATTR_length
- rtx body;
- int i;
- int length = 0;
-
- if (insn_lengths)
- return insn_lengths[INSN_UID (insn)];
- else
- switch (GET_CODE (insn))
- {
- case NOTE:
- case BARRIER:
- case CODE_LABEL:
- return 0;
-
- case CALL_INSN:
- length = insn_default_length (insn);
- break;
-
- case JUMP_INSN:
- body = PATTERN (insn);
- if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
- {
- /* This only takes room if jump tables go into the text section. */
-#if !defined(READONLY_DATA_SECTION) || defined(JUMP_TABLES_IN_TEXT_SECTION)
- length = (XVECLEN (body, GET_CODE (body) == ADDR_DIFF_VEC)
- * GET_MODE_SIZE (GET_MODE (body)));
-
- /* Be pessimistic and assume worst-case alignment. */
- length += (GET_MODE_SIZE (GET_MODE (body)) - 1);
-#else
- return 0;
-#endif
- }
- else
- length = insn_default_length (insn);
- break;
-
- case INSN:
- body = PATTERN (insn);
- if (GET_CODE (body) == USE || GET_CODE (body) == CLOBBER)
- return 0;
-
- else if (GET_CODE (body) == ASM_INPUT || asm_noperands (body) >= 0)
- length = asm_insn_count (body) * insn_default_length (insn);
- else if (GET_CODE (body) == SEQUENCE)
- for (i = 0; i < XVECLEN (body, 0); i++)
- length += get_attr_length (XVECEXP (body, 0, i));
- else
- length = insn_default_length (insn);
- }
-
-#ifdef ADJUST_INSN_LENGTH
- ADJUST_INSN_LENGTH (insn, length);
-#endif
- return length;
-#else /* not HAVE_ATTR_length */
- return 0;
-#endif /* not HAVE_ATTR_length */
-}
-\f
-/* Make a pass over all insns and compute their actual lengths by shortening
- any branches of variable length if possible. */
-
-/* Give a default value for the lowest address in a function. */
-
-#ifndef FIRST_INSN_ADDRESS
-#define FIRST_INSN_ADDRESS 0
-#endif
-
-void
-shorten_branches (first)
- rtx first;
-{
-#ifdef HAVE_ATTR_length
- rtx insn;
- int something_changed = 1;
- int max_uid = 0;
- char *varying_length;
- rtx body;
- int uid;
-
- /* Compute maximum UID and allocate arrays. */
- for (insn = first; insn; insn = NEXT_INSN (insn))
- if (INSN_UID (insn) > max_uid)
- max_uid = INSN_UID (insn);
-
- max_uid++;
- insn_lengths = (short *) oballoc (max_uid * sizeof (short));
- insn_addresses = (int *) oballoc (max_uid * sizeof (int));
- varying_length = (char *) oballoc (max_uid * sizeof (char));
-
- /* Compute initial lengths, addresses, and varying flags for each insn. */
- for (insn_current_address = FIRST_INSN_ADDRESS, insn = first;
- insn != 0;
- insn_current_address += insn_lengths[uid], insn = NEXT_INSN (insn))
- {
- uid = INSN_UID (insn);
- insn_addresses[uid] = insn_current_address;
- insn_lengths[uid] = 0;
- varying_length[uid] = 0;
-
- if (GET_CODE (insn) == NOTE || GET_CODE (insn) == BARRIER
- || GET_CODE (insn) == CODE_LABEL)
- continue;
-
- body = PATTERN (insn);
- if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
- {
- /* This only takes room if read-only data goes into the text
- section. */
-#if !defined(READONLY_DATA_SECTION) || defined(JUMP_TABLES_IN_TEXT_SECTION)
- int unitsize = GET_MODE_SIZE (GET_MODE (body));
-
- insn_lengths[uid] = (XVECLEN (body, GET_CODE (body) == ADDR_DIFF_VEC)
- * GET_MODE_SIZE (GET_MODE (body)));
-
- /* Account for possible alignment. */
- insn_lengths[uid]
- += unitsize - (insn_current_address & (unitsize - 1));
-#else
- ;
-#endif
- }
- else if (asm_noperands (body) >= 0)
- insn_lengths[uid] = asm_insn_count (body) * insn_default_length (insn);
- else if (GET_CODE (body) == SEQUENCE)
- {
- int i;
- int const_delay_slots;
-#ifdef DELAY_SLOTS
- const_delay_slots = const_num_delay_slots (XVECEXP (body, 0, 0));
-#else
- const_delay_slots = 0;
-#endif
- /* Inside a delay slot sequence, we do not do any branch shortening
- if the shortening could change the number of delay slots
- of the branch. */
- for (i = 0; i < XVECLEN (body, 0); i++)
- {
- rtx inner_insn = XVECEXP (body, 0, i);
- int inner_uid = INSN_UID (inner_insn);
- int inner_length;
-
- if (asm_noperands (PATTERN (XVECEXP (body, 0, i))) >= 0)
- inner_length = (asm_insn_count (PATTERN (inner_insn))
- * insn_default_length (inner_insn));
- else
- inner_length = insn_default_length (inner_insn);
-
- insn_lengths[inner_uid] = inner_length;
- if (const_delay_slots)
- {
- if ((varying_length[inner_uid]
- = insn_variable_length_p (inner_insn)) != 0)
- varying_length[uid] = 1;
- insn_addresses[inner_uid] = (insn_current_address +
- insn_lengths[uid]);
- }
- else
- varying_length[inner_uid] = 0;
- insn_lengths[uid] += inner_length;
- }
- }
- else if (GET_CODE (body) != USE && GET_CODE (body) != CLOBBER)
- {
- insn_lengths[uid] = insn_default_length (insn);
- varying_length[uid] = insn_variable_length_p (insn);
- }
-
- /* If needed, do any adjustment. */
-#ifdef ADJUST_INSN_LENGTH
- ADJUST_INSN_LENGTH (insn, insn_lengths[uid]);
-#endif
- }
-
- /* Now loop over all the insns finding varying length insns. For each,
- get the current insn length. If it has changed, reflect the change.
- When nothing changes for a full pass, we are done. */
-
- while (something_changed)
- {
- something_changed = 0;
- for (insn_current_address = FIRST_INSN_ADDRESS, insn = first;
- insn != 0;
- insn = NEXT_INSN (insn))
- {
- int new_length;
- int tmp_length;
-
- uid = INSN_UID (insn);
- insn_addresses[uid] = insn_current_address;
- if (! varying_length[uid])
- {
- insn_current_address += insn_lengths[uid];
- continue;
- }
- if (GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == SEQUENCE)
- {
- int i;
-
- body = PATTERN (insn);
- new_length = 0;
- for (i = 0; i < XVECLEN (body, 0); i++)
- {
- rtx inner_insn = XVECEXP (body, 0, i);
- int inner_uid = INSN_UID (inner_insn);
- int inner_length;
-
- insn_addresses[inner_uid] = insn_current_address;
-
- /* insn_current_length returns 0 for insns with a
- non-varying length. */
- if (! varying_length[inner_uid])
- inner_length = insn_lengths[inner_uid];
- else
- inner_length = insn_current_length (inner_insn);
-
- if (inner_length != insn_lengths[inner_uid])
- {
- insn_lengths[inner_uid] = inner_length;
- something_changed = 1;
- }
- insn_current_address += insn_lengths[inner_uid];
- new_length += inner_length;
- }
- }
- else
- {
- new_length = insn_current_length (insn);
- insn_current_address += new_length;
- }
-
-#ifdef SHORTEN_WITH_ADJUST_INSN_LENGTH
-#ifdef ADJUST_INSN_LENGTH
- /* If needed, do any adjustment. */
- tmp_length = new_length;
- ADJUST_INSN_LENGTH (insn, new_length);
- insn_current_address += (new_length - tmp_length);
-#endif
-#endif
-
- if (new_length != insn_lengths[uid])
- {
- insn_lengths[uid] = new_length;
- something_changed = 1;
- }
- }
- }
-#endif /* HAVE_ATTR_length */
-}
-
-#ifdef HAVE_ATTR_length
-/* Given the body of an INSN known to be generated by an ASM statement, return
- the number of machine instructions likely to be generated for this insn.
- This is used to compute its length. */
-
-static int
-asm_insn_count (body)
- rtx body;
-{
- char *template;
- int count = 1;
-
- for (template = decode_asm_operands (body, NULL_PTR, NULL_PTR,
- NULL_PTR, NULL_PTR);
- *template; template++)
- if (IS_ASM_LOGICAL_LINE_SEPARATOR(*template) || *template == '\n')
- count++;
-
- return count;
-}
-#endif
-\f
-/* Output assembler code for the start of a function,
- and initialize some of the variables in this file
- for the new function. The label for the function and associated
- assembler pseudo-ops have already been output in `assemble_start_function'.
-
- FIRST is the first insn of the rtl for the function being compiled.
- FILE is the file to write assembler code to.
- OPTIMIZE is nonzero if we should eliminate redundant
- test and compare insns. */
-
-void
-final_start_function (first, file, optimize)
- rtx first;
- FILE *file;
- int optimize;
-{
- block_depth = 0;
-
- this_is_asm_operands = 0;
-
-#ifdef NON_SAVING_SETJMP
- /* A function that calls setjmp should save and restore all the
- call-saved registers on a system where longjmp clobbers them. */
- if (NON_SAVING_SETJMP && current_function_calls_setjmp)
- {
- int i;
-
- for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
- if (!call_used_regs[i] && !call_fixed_regs[i])
- regs_ever_live[i] = 1;
- }
-#endif
-
- /* Initial line number is supposed to be output
- before the function's prologue and label
- so that the function's address will not appear to be
- in the last statement of the preceding function. */
- if (NOTE_LINE_NUMBER (first) != NOTE_INSN_DELETED)
- {
- if (write_symbols == SDB_DEBUG)
- /* For sdb, let's not, but say we did.
- We need to set last_linenum for sdbout_function_begin,
- but we can't have an actual line number before the .bf symbol.
- (sdb_begin_function_line is not set,
- and other compilers don't do it.) */
- last_linenum = NOTE_LINE_NUMBER (first);
-#ifdef XCOFF_DEBUGGING_INFO
- else if (write_symbols == XCOFF_DEBUG)
- {
- last_linenum = NOTE_LINE_NUMBER (first);
- xcoffout_output_first_source_line (file, last_linenum);
- }
-#endif
- else
- output_source_line (file, first);
- }
-
-#ifdef LEAF_REG_REMAP
- if (leaf_function)
- leaf_renumber_regs (first);
-#endif
-
- /* The Sun386i and perhaps other machines don't work right
- if the profiling code comes after the prologue. */
-#ifdef PROFILE_BEFORE_PROLOGUE
- if (profile_flag)
- profile_function (file);
-#endif /* PROFILE_BEFORE_PROLOGUE */
-
-#ifdef FUNCTION_PROLOGUE
- /* First output the function prologue: code to set up the stack frame. */
- FUNCTION_PROLOGUE (file, get_frame_size ());
-#endif
-
-#if defined (SDB_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
- if (write_symbols == SDB_DEBUG || write_symbols == XCOFF_DEBUG)
- next_block_index = 1;
-#endif
-
- /* If the machine represents the prologue as RTL, the profiling code must
- be emitted when NOTE_INSN_PROLOGUE_END is scanned. */
-#ifdef HAVE_prologue
- if (! HAVE_prologue)
-#endif
- profile_after_prologue (file);
-
- profile_label_no++;
-
- /* If we are doing basic block profiling, remember a printable version
- of the function name. */
- if (profile_block_flag)
- {
- char *junk = "function";
- bb_func_label_num =
- add_bb_string ((*decl_printable_name) (current_function_decl, &junk), FALSE);
- }
-}
-
-static void
-profile_after_prologue (file)
- FILE *file;
-{
-#ifdef FUNCTION_BLOCK_PROFILER
- if (profile_block_flag)
- {
- FUNCTION_BLOCK_PROFILER (file, profile_label_no);
- }
-#endif /* FUNCTION_BLOCK_PROFILER */
-
-#ifndef PROFILE_BEFORE_PROLOGUE
- if (profile_flag)
- profile_function (file);
-#endif /* not PROFILE_BEFORE_PROLOGUE */
-}
-
-static void
-profile_function (file)
- FILE *file;
-{
- int align = MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD);
- int sval = current_function_returns_struct;
- int cxt = current_function_needs_context;
-
- data_section ();
- ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
- ASM_OUTPUT_INTERNAL_LABEL (file, "LP", profile_label_no);
- assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
-
- text_section ();
-
-#ifdef STRUCT_VALUE_INCOMING_REGNUM
- if (sval)
- ASM_OUTPUT_REG_PUSH (file, STRUCT_VALUE_INCOMING_REGNUM);
-#else
-#ifdef STRUCT_VALUE_REGNUM
- if (sval)
- ASM_OUTPUT_REG_PUSH (file, STRUCT_VALUE_REGNUM);
-#endif
-#endif
-
-#if 0
-#ifdef STATIC_CHAIN_INCOMING_REGNUM
- if (cxt)
- ASM_OUTPUT_REG_PUSH (file, STATIC_CHAIN_INCOMING_REGNUM);
-#else
-#ifdef STATIC_CHAIN_REGNUM
- if (cxt)
- ASM_OUTPUT_REG_PUSH (file, STATIC_CHAIN_REGNUM);
-#endif
-#endif
-#endif /* 0 */
-
- FUNCTION_PROFILER (file, profile_label_no);
-
-#if 0
-#ifdef STATIC_CHAIN_INCOMING_REGNUM
- if (cxt)
- ASM_OUTPUT_REG_POP (file, STATIC_CHAIN_INCOMING_REGNUM);
-#else
-#ifdef STATIC_CHAIN_REGNUM
- if (cxt)
- ASM_OUTPUT_REG_POP (file, STATIC_CHAIN_REGNUM);
-#endif
-#endif
-#endif /* 0 */
-
-#ifdef STRUCT_VALUE_INCOMING_REGNUM
- if (sval)
- ASM_OUTPUT_REG_POP (file, STRUCT_VALUE_INCOMING_REGNUM);
-#else
-#ifdef STRUCT_VALUE_REGNUM
- if (sval)
- ASM_OUTPUT_REG_POP (file, STRUCT_VALUE_REGNUM);
-#endif
-#endif
-}
-
-/* Output assembler code for the end of a function.
- For clarity, args are same as those of `final_start_function'
- even though not all of them are needed. */
-
-void
-final_end_function (first, file, optimize)
- rtx first;
- FILE *file;
- int optimize;
-{
- if (app_on)
- {
- fprintf (file, ASM_APP_OFF);
- app_on = 0;
- }
-
-#ifdef SDB_DEBUGGING_INFO
- if (write_symbols == SDB_DEBUG)
- sdbout_end_function (last_linenum);
-#endif
-
-#ifdef DWARF_DEBUGGING_INFO
- if (write_symbols == DWARF_DEBUG)
- dwarfout_end_function ();
-#endif
-
-#ifdef XCOFF_DEBUGGING_INFO
- if (write_symbols == XCOFF_DEBUG)
- xcoffout_end_function (file, last_linenum);
-#endif
-
-#ifdef FUNCTION_EPILOGUE
- /* Finally, output the function epilogue:
- code to restore the stack frame and return to the caller. */
- FUNCTION_EPILOGUE (file, get_frame_size ());
-#endif
-
-#ifdef SDB_DEBUGGING_INFO
- if (write_symbols == SDB_DEBUG)
- sdbout_end_epilogue ();
-#endif
-
-#ifdef DWARF_DEBUGGING_INFO
- if (write_symbols == DWARF_DEBUG)
- dwarfout_end_epilogue ();
-#endif
-
-#ifdef XCOFF_DEBUGGING_INFO
- if (write_symbols == XCOFF_DEBUG)
- xcoffout_end_epilogue (file);
-#endif
-
- bb_func_label_num = -1; /* not in function, nuke label # */
-
- /* If FUNCTION_EPILOGUE is not defined, then the function body
- itself contains return instructions wherever needed. */
-}
-\f
-/* Add a block to the linked list that remembers the current line/file/function
- for basic block profiling. Emit the label in front of the basic block and
- the instructions that increment the count field. */
-
-static void
-add_bb (file)
- FILE *file;
-{
- struct bb_list *ptr = (struct bb_list *) permalloc (sizeof (struct bb_list));
-
- /* Add basic block to linked list. */
- ptr->next = 0;
- ptr->line_num = last_linenum;
- ptr->file_label_num = bb_file_label_num;
- ptr->func_label_num = bb_func_label_num;
- *bb_tail = ptr;
- bb_tail = &ptr->next;
-
- /* Enable the table of basic-block use counts
- to point at the code it applies to. */
- ASM_OUTPUT_INTERNAL_LABEL (file, "LPB", count_basic_blocks);
-
- /* Before first insn of this basic block, increment the
- count of times it was entered. */
-#ifdef BLOCK_PROFILER
- BLOCK_PROFILER (file, count_basic_blocks);
- CC_STATUS_INIT;
-#endif
-
- new_block = 0;
- count_basic_blocks++;
-}
-
-/* Add a string to be used for basic block profiling. */
-
-static int
-add_bb_string (string, perm_p)
- char *string;
- int perm_p;
-{
- int len;
- struct bb_str *ptr = 0;
-
- if (!string)
- {
- string = "<unknown>";
- perm_p = TRUE;
- }
-
- /* Allocate a new string if the current string isn't permanent. If
- the string is permanent search for the same string in other
- allocations. */
-
- len = strlen (string) + 1;
- if (!perm_p)
- {
- char *p = (char *) permalloc (len);
- bcopy (string, p, len);
- string = p;
- }
- else
- for (ptr = sbb_head; ptr != (struct bb_str *)0; ptr = ptr->next)
- if (ptr->string == string)
- break;
-
- /* Allocate a new string block if we need to. */
- if (!ptr)
- {
- ptr = (struct bb_str *) permalloc (sizeof (*ptr));
- ptr->next = 0;
- ptr->length = len;
- ptr->label_num = sbb_label_num++;
- ptr->string = string;
- *sbb_tail = ptr;
- sbb_tail = &ptr->next;
- }
-
- return ptr->label_num;
-}
-
-\f
-/* Output assembler code for some insns: all or part of a function.
- For description of args, see `final_start_function', above.
-
- PRESCAN is 1 if we are not really outputting,
- just scanning as if we were outputting.
- Prescanning deletes and rearranges insns just like ordinary output.
- PRESCAN is -2 if we are outputting after having prescanned.
- In this case, don't try to delete or rearrange insns
- because that has already been done.
- Prescanning is done only on certain machines. */
-
-void
-final (first, file, optimize, prescan)
- rtx first;
- FILE *file;
- int optimize;
- int prescan;
-{
- register rtx insn;
- int max_line = 0;
-
- last_ignored_compare = 0;
- new_block = 1;
-
- /* Make a map indicating which line numbers appear in this function.
- When producing SDB debugging info, delete troublesome line number
- notes from inlined functions in other files as well as duplicate
- line number notes. */
-#ifdef SDB_DEBUGGING_INFO
- if (write_symbols == SDB_DEBUG)
- {
- rtx last = 0;
- for (insn = first; insn; insn = NEXT_INSN (insn))
- if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
- {
- if ((RTX_INTEGRATED_P (insn)
- && strcmp (NOTE_SOURCE_FILE (insn), main_input_filename) != 0)
- || (last != 0
- && NOTE_LINE_NUMBER (insn) == NOTE_LINE_NUMBER (last)
- && NOTE_SOURCE_FILE (insn) == NOTE_SOURCE_FILE (last)))
- {
- NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
- NOTE_SOURCE_FILE (insn) = 0;
- continue;
- }
- last = insn;
- if (NOTE_LINE_NUMBER (insn) > max_line)
- max_line = NOTE_LINE_NUMBER (insn);
- }
- }
- else
-#endif
- {
- for (insn = first; insn; insn = NEXT_INSN (insn))
- if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > max_line)
- max_line = NOTE_LINE_NUMBER (insn);
- }
-
- line_note_exists = (char *) oballoc (max_line + 1);
- bzero (line_note_exists, max_line + 1);
-
- for (insn = first; insn; insn = NEXT_INSN (insn))
- if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
- line_note_exists[NOTE_LINE_NUMBER (insn)] = 1;
-
- init_recog ();
-
- CC_STATUS_INIT;
-
- /* Output the insns. */
- for (insn = NEXT_INSN (first); insn;)
- insn = final_scan_insn (insn, file, optimize, prescan, 0);
-
- /* Do basic-block profiling here
- if the last insn was a conditional branch. */
- if (profile_block_flag && new_block)
- add_bb (file);
-}
-\f
-/* The final scan for one insn, INSN.
- Args are same as in `final', except that INSN
- is the insn being scanned.
- Value returned is the next insn to be scanned.
-
- NOPEEPHOLES is the flag to disallow peephole processing (currently
- used for within delayed branch sequence output). */
-
-rtx
-final_scan_insn (insn, file, optimize, prescan, nopeepholes)
- rtx insn;
- FILE *file;
- int optimize;
- int prescan;
- int nopeepholes;
-{
- register int i;
- insn_counter++;
-
- /* Ignore deleted insns. These can occur when we split insns (due to a
- template of "#") while not optimizing. */
- if (INSN_DELETED_P (insn))
- return NEXT_INSN (insn);
-
- switch (GET_CODE (insn))
- {
- case NOTE:
- if (prescan > 0)
- break;
-
- /* Align the beginning of a loop, for higher speed
- on certain machines. */
-
- if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_BEG && optimize > 0)
- {
-#ifdef ASM_OUTPUT_LOOP_ALIGN
- rtx next = next_nonnote_insn (insn);
- if (next && GET_CODE (next) == CODE_LABEL)
- {
- ASM_OUTPUT_LOOP_ALIGN (asm_out_file);
- }
-#endif
- break;
- }
- if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_END)
- break;
-
- if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END)
- {
-#ifdef FUNCTION_END_PROLOGUE
- FUNCTION_END_PROLOGUE (file);
-#endif
- profile_after_prologue (file);
- break;
- }
-
-#ifdef FUNCTION_BEGIN_EPILOGUE
- if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EPILOGUE_BEG)
- {
- FUNCTION_BEGIN_EPILOGUE (file);
- break;
- }
-#endif
-
- if (write_symbols == NO_DEBUG)
- break;
- if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_FUNCTION_BEG)
- {
-#ifdef SDB_DEBUGGING_INFO
- if (write_symbols == SDB_DEBUG)
- sdbout_begin_function (last_linenum);
-#endif
-#ifdef XCOFF_DEBUGGING_INFO
- if (write_symbols == XCOFF_DEBUG)
- xcoffout_begin_function (file, last_linenum);
-#endif
-#ifdef DWARF_DEBUGGING_INFO
- if (write_symbols == DWARF_DEBUG)
- dwarfout_begin_function ();
-#endif
- break;
- }
- if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_DELETED)
- break; /* An insn that was "deleted" */
- if (app_on)
- {
- fprintf (file, ASM_APP_OFF);
- app_on = 0;
- }
- if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG
- && (debug_info_level == DINFO_LEVEL_NORMAL
- || debug_info_level == DINFO_LEVEL_VERBOSE
-#ifdef DWARF_DEBUGGING_INFO
- || write_symbols == DWARF_DEBUG
-#endif
- )
- )
- {
- /* Beginning of a symbol-block. Assign it a sequence number
- and push the number onto the stack PENDING_BLOCKS. */
-
- if (block_depth == max_block_depth)
- {
- /* PENDING_BLOCKS is full; make it longer. */
- max_block_depth *= 2;
- pending_blocks
- = (int *) xrealloc (pending_blocks,
- max_block_depth * sizeof (int));
- }
- pending_blocks[block_depth++] = next_block_index;
-
- /* Output debugging info about the symbol-block beginning. */
-
-#ifdef SDB_DEBUGGING_INFO
- if (write_symbols == SDB_DEBUG)
- sdbout_begin_block (file, last_linenum, next_block_index);
-#endif
-#ifdef XCOFF_DEBUGGING_INFO
- if (write_symbols == XCOFF_DEBUG)
- xcoffout_begin_block (file, last_linenum, next_block_index);
-#endif
-#ifdef DBX_DEBUGGING_INFO
- if (write_symbols == DBX_DEBUG)
- ASM_OUTPUT_INTERNAL_LABEL (file, "LBB", next_block_index);
-#endif
-#ifdef DWARF_DEBUGGING_INFO
- if (write_symbols == DWARF_DEBUG && block_depth > 1)
- dwarfout_begin_block (next_block_index);
-#endif
-
- next_block_index++;
- }
- else if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END
- && (debug_info_level == DINFO_LEVEL_NORMAL
- || debug_info_level == DINFO_LEVEL_VERBOSE
-#ifdef DWARF_DEBUGGING_INFO
- || write_symbols == DWARF_DEBUG
-#endif
- )
- )
- {
- /* End of a symbol-block. Pop its sequence number off
- PENDING_BLOCKS and output debugging info based on that. */
-
- --block_depth;
-
-#ifdef XCOFF_DEBUGGING_INFO
- if (write_symbols == XCOFF_DEBUG && block_depth >= 0)
- xcoffout_end_block (file, last_linenum, pending_blocks[block_depth]);
-#endif
-#ifdef DBX_DEBUGGING_INFO
- if (write_symbols == DBX_DEBUG && block_depth >= 0)
- ASM_OUTPUT_INTERNAL_LABEL (file, "LBE",
- pending_blocks[block_depth]);
-#endif
-#ifdef SDB_DEBUGGING_INFO
- if (write_symbols == SDB_DEBUG && block_depth >= 0)
- sdbout_end_block (file, last_linenum, pending_blocks[block_depth]);
-#endif
-#ifdef DWARF_DEBUGGING_INFO
- if (write_symbols == DWARF_DEBUG && block_depth >= 1)
- dwarfout_end_block (pending_blocks[block_depth]);
-#endif
- }
- else if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_DELETED_LABEL
- && (debug_info_level == DINFO_LEVEL_NORMAL
- || debug_info_level == DINFO_LEVEL_VERBOSE))
- {
-#ifdef DWARF_DEBUGGING_INFO
- if (write_symbols == DWARF_DEBUG)
- dwarfout_label (insn);
-#endif
- }
- else if (NOTE_LINE_NUMBER (insn) > 0)
- /* This note is a line-number. */
- {
- register rtx note;
-
-#if 0 /* This is what we used to do. */
- output_source_line (file, insn);
-#endif
- int note_after = 0;
-
- /* If there is anything real after this note,
- output it. If another line note follows, omit this one. */
- for (note = NEXT_INSN (insn); note; note = NEXT_INSN (note))
- {
- if (GET_CODE (note) != NOTE && GET_CODE (note) != CODE_LABEL)
- break;
- /* These types of notes can be significant
- so make sure the preceding line number stays. */
- else if (GET_CODE (note) == NOTE
- && (NOTE_LINE_NUMBER (note) == NOTE_INSN_BLOCK_BEG
- || NOTE_LINE_NUMBER (note) == NOTE_INSN_BLOCK_END
- || NOTE_LINE_NUMBER (note) == NOTE_INSN_FUNCTION_BEG))
- break;
- else if (GET_CODE (note) == NOTE && NOTE_LINE_NUMBER (note) > 0)
- {
- /* Another line note follows; we can delete this note
- if no intervening line numbers have notes elsewhere. */
- int num;
- for (num = NOTE_LINE_NUMBER (insn) + 1;
- num < NOTE_LINE_NUMBER (note);
- num++)
- if (line_note_exists[num])
- break;
-
- if (num >= NOTE_LINE_NUMBER (note))
- note_after = 1;
- break;
- }
- }
-
- /* Output this line note
- if it is the first or the last line note in a row. */
- if (!note_after)
- output_source_line (file, insn);
- }
- break;
-
- case BARRIER:
-#ifdef ASM_OUTPUT_ALIGN_CODE
- /* Don't litter the assembler output with needless alignments. A
- BARRIER will be placed at the end of every function if HAVE_epilogue
- is true. */
- if (NEXT_INSN (insn))
- ASM_OUTPUT_ALIGN_CODE (file);
-#endif
- break;
-
- case CODE_LABEL:
- CC_STATUS_INIT;
- if (prescan > 0)
- break;
- new_block = 1;
-#ifdef SDB_DEBUGGING_INFO
- if (write_symbols == SDB_DEBUG && LABEL_NAME (insn))
- sdbout_label (insn);
-#endif
-#ifdef DWARF_DEBUGGING_INFO
- if (write_symbols == DWARF_DEBUG && LABEL_NAME (insn))
- dwarfout_label (insn);
-#endif
- if (app_on)
- {
- fprintf (file, ASM_APP_OFF);
- app_on = 0;
- }
- if (NEXT_INSN (insn) != 0
- && GET_CODE (NEXT_INSN (insn)) == JUMP_INSN)
- {
- rtx nextbody = PATTERN (NEXT_INSN (insn));
-
- /* If this label is followed by a jump-table,
- make sure we put the label in the read-only section. Also
- possibly write the label and jump table together. */
-
- if (GET_CODE (nextbody) == ADDR_VEC
- || GET_CODE (nextbody) == ADDR_DIFF_VEC)
- {
-#ifndef JUMP_TABLES_IN_TEXT_SECTION
- readonly_data_section ();
-#ifdef READONLY_DATA_SECTION
- ASM_OUTPUT_ALIGN (file,
- exact_log2 (BIGGEST_ALIGNMENT
- / BITS_PER_UNIT));
-#endif /* READONLY_DATA_SECTION */
-#else /* JUMP_TABLES_IN_TEXT_SECTION */
- text_section ();
-#endif /* JUMP_TABLES_IN_TEXT_SECTION */
-#ifdef ASM_OUTPUT_CASE_LABEL
- ASM_OUTPUT_CASE_LABEL (file, "L", CODE_LABEL_NUMBER (insn),
- NEXT_INSN (insn));
-#else
- ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
-#endif
- break;
- }
- }
-
- ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
- break;
-
- default:
- {
- register rtx body = PATTERN (insn);
- int insn_code_number;
- char *template;
- rtx note;
-
- /* An INSN, JUMP_INSN or CALL_INSN.
- First check for special kinds that recog doesn't recognize. */
-
- if (GET_CODE (body) == USE /* These are just declarations */
- || GET_CODE (body) == CLOBBER)
- break;
-
-#ifdef HAVE_cc0
- /* If there is a REG_CC_SETTER note on this insn, it means that
- the setting of the condition code was done in the delay slot
- of the insn that branched here. So recover the cc status
- from the insn that set it. */
-
- note = find_reg_note (insn, REG_CC_SETTER, NULL_RTX);
- if (note)
- {
- NOTICE_UPDATE_CC (PATTERN (XEXP (note, 0)), XEXP (note, 0));
- cc_prev_status = cc_status;
- }
-#endif
-
- /* Detect insns that are really jump-tables
- and output them as such. */
-
- if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
- {
- register int vlen, idx;
-
- if (prescan > 0)
- break;
-
- if (app_on)
- {
- fprintf (file, ASM_APP_OFF);
- app_on = 0;
- }
-
- vlen = XVECLEN (body, GET_CODE (body) == ADDR_DIFF_VEC);
- for (idx = 0; idx < vlen; idx++)
- {
- if (GET_CODE (body) == ADDR_VEC)
- {
-#ifdef ASM_OUTPUT_ADDR_VEC_ELT
- ASM_OUTPUT_ADDR_VEC_ELT
- (file, CODE_LABEL_NUMBER (XEXP (XVECEXP (body, 0, idx), 0)));
-#else
- abort ();
-#endif
- }
- else
- {
-#ifdef ASM_OUTPUT_ADDR_DIFF_ELT
- ASM_OUTPUT_ADDR_DIFF_ELT
- (file,
- CODE_LABEL_NUMBER (XEXP (XVECEXP (body, 1, idx), 0)),
- CODE_LABEL_NUMBER (XEXP (XEXP (body, 0), 0)));
-#else
- abort ();
-#endif
- }
- }
-#ifdef ASM_OUTPUT_CASE_END
- ASM_OUTPUT_CASE_END (file,
- CODE_LABEL_NUMBER (PREV_INSN (insn)),
- insn);
-#endif
-
- text_section ();
-
- break;
- }
-
- /* Do basic-block profiling when we reach a new block.
- Done here to avoid jump tables. */
- if (profile_block_flag && new_block)
- add_bb (file);
-
- if (GET_CODE (body) == ASM_INPUT)
- {
- /* There's no telling what that did to the condition codes. */
- CC_STATUS_INIT;
- if (prescan > 0)
- break;
- if (! app_on)
- {
- fprintf (file, ASM_APP_ON);
- app_on = 1;
- }
- fprintf (asm_out_file, "\t%s\n", XSTR (body, 0));
- break;
- }
-
- /* Detect `asm' construct with operands. */
- if (asm_noperands (body) >= 0)
- {
- int noperands = asm_noperands (body);
- rtx *ops = (rtx *) alloca (noperands * sizeof (rtx));
- char *string;
-
- /* There's no telling what that did to the condition codes. */
- CC_STATUS_INIT;
- if (prescan > 0)
- break;
-
- if (! app_on)
- {
- fprintf (file, ASM_APP_ON);
- app_on = 1;
- }
-
- /* Get out the operand values. */
- string = decode_asm_operands (body, ops, NULL_PTR,
- NULL_PTR, NULL_PTR);
- /* Inhibit aborts on what would otherwise be compiler bugs. */
- insn_noperands = noperands;
- this_is_asm_operands = insn;
-
- /* Output the insn using them. */
- output_asm_insn (string, ops);
- this_is_asm_operands = 0;
- break;
- }
-
- if (prescan <= 0 && app_on)
- {
- fprintf (file, ASM_APP_OFF);
- app_on = 0;
- }
-
- if (GET_CODE (body) == SEQUENCE)
- {
- /* A delayed-branch sequence */
- register int i;
- rtx next;
-
- if (prescan > 0)
- break;
- final_sequence = body;
-
- /* The first insn in this SEQUENCE might be a JUMP_INSN that will
- force the restoration of a comparison that was previously
- thought unnecessary. If that happens, cancel this sequence
- and cause that insn to be restored. */
-
- next = final_scan_insn (XVECEXP (body, 0, 0), file, 0, prescan, 1);
- if (next != XVECEXP (body, 0, 1))
- {
- final_sequence = 0;
- return next;
- }
-
- for (i = 1; i < XVECLEN (body, 0); i++)
- final_scan_insn (XVECEXP (body, 0, i), file, 0, prescan, 1);
-#ifdef DBR_OUTPUT_SEQEND
- DBR_OUTPUT_SEQEND (file);
-#endif
- final_sequence = 0;
-
- /* If the insn requiring the delay slot was a CALL_INSN, the
- insns in the delay slot are actually executed before the
- called function. Hence we don't preserve any CC-setting
- actions in these insns and the CC must be marked as being
- clobbered by the function. */
- if (GET_CODE (XVECEXP (body, 0, 0)) == CALL_INSN)
- CC_STATUS_INIT;
-
- /* Following a conditional branch sequence, we have a new basic
- block. */
- if (profile_block_flag)
- {
- rtx insn = XVECEXP (body, 0, 0);
- rtx body = PATTERN (insn);
-
- if ((GET_CODE (insn) == JUMP_INSN && GET_CODE (body) == SET
- && GET_CODE (SET_SRC (body)) != LABEL_REF)
- || (GET_CODE (insn) == JUMP_INSN
- && GET_CODE (body) == PARALLEL
- && GET_CODE (XVECEXP (body, 0, 0)) == SET
- && GET_CODE (SET_SRC (XVECEXP (body, 0, 0))) != LABEL_REF))
- new_block = 1;
- }
- break;
- }
-
- /* We have a real machine instruction as rtl. */
-
- body = PATTERN (insn);
-
-#ifdef HAVE_cc0
- /* Check for redundant test and compare instructions
- (when the condition codes are already set up as desired).
- This is done only when optimizing; if not optimizing,
- it should be possible for the user to alter a variable
- with the debugger in between statements
- and the next statement should reexamine the variable
- to compute the condition codes. */
-
- if (optimize
- && GET_CODE (body) == SET
- && GET_CODE (SET_DEST (body)) == CC0
- && insn != last_ignored_compare)
- {
- if (GET_CODE (SET_SRC (body)) == SUBREG)
- SET_SRC (body) = alter_subreg (SET_SRC (body));
- else if (GET_CODE (SET_SRC (body)) == COMPARE)
- {
- if (GET_CODE (XEXP (SET_SRC (body), 0)) == SUBREG)
- XEXP (SET_SRC (body), 0)
- = alter_subreg (XEXP (SET_SRC (body), 0));
- if (GET_CODE (XEXP (SET_SRC (body), 1)) == SUBREG)
- XEXP (SET_SRC (body), 1)
- = alter_subreg (XEXP (SET_SRC (body), 1));
- }
- if ((cc_status.value1 != 0
- && rtx_equal_p (SET_SRC (body), cc_status.value1))
- || (cc_status.value2 != 0
- && rtx_equal_p (SET_SRC (body), cc_status.value2)))
- {
- /* Don't delete insn if it has an addressing side-effect. */
- if (! FIND_REG_INC_NOTE (insn, 0)
- /* or if anything in it is volatile. */
- && ! volatile_refs_p (PATTERN (insn)))
- {
- /* We don't really delete the insn; just ignore it. */
- last_ignored_compare = insn;
- break;
- }
- }
- }
-#endif
-
- /* Following a conditional branch, we have a new basic block.
- But if we are inside a sequence, the new block starts after the
- last insn of the sequence. */
- if (profile_block_flag && final_sequence == 0
- && ((GET_CODE (insn) == JUMP_INSN && GET_CODE (body) == SET
- && GET_CODE (SET_SRC (body)) != LABEL_REF)
- || (GET_CODE (insn) == JUMP_INSN && GET_CODE (body) == PARALLEL
- && GET_CODE (XVECEXP (body, 0, 0)) == SET
- && GET_CODE (SET_SRC (XVECEXP (body, 0, 0))) != LABEL_REF)))
- new_block = 1;
-
-#ifndef STACK_REGS
- /* Don't bother outputting obvious no-ops, even without -O.
- This optimization is fast and doesn't interfere with debugging.
- Don't do this if the insn is in a delay slot, since this
- will cause an improper number of delay insns to be written. */
- if (final_sequence == 0
- && prescan >= 0
- && GET_CODE (insn) == INSN && GET_CODE (body) == SET
- && GET_CODE (SET_SRC (body)) == REG
- && GET_CODE (SET_DEST (body)) == REG
- && REGNO (SET_SRC (body)) == REGNO (SET_DEST (body)))
- break;
-#endif
-
-#ifdef HAVE_cc0
- /* If this is a conditional branch, maybe modify it
- if the cc's are in a nonstandard state
- so that it accomplishes the same thing that it would
- do straightforwardly if the cc's were set up normally. */
-
- if (cc_status.flags != 0
- && GET_CODE (insn) == JUMP_INSN
- && GET_CODE (body) == SET
- && SET_DEST (body) == pc_rtx
- && GET_CODE (SET_SRC (body)) == IF_THEN_ELSE
- /* This is done during prescan; it is not done again
- in final scan when prescan has been done. */
- && prescan >= 0)
- {
- /* This function may alter the contents of its argument
- and clear some of the cc_status.flags bits.
- It may also return 1 meaning condition now always true
- or -1 meaning condition now always false
- or 2 meaning condition nontrivial but altered. */
- register int result = alter_cond (XEXP (SET_SRC (body), 0));
- /* If condition now has fixed value, replace the IF_THEN_ELSE
- with its then-operand or its else-operand. */
- if (result == 1)
- SET_SRC (body) = XEXP (SET_SRC (body), 1);
- if (result == -1)
- SET_SRC (body) = XEXP (SET_SRC (body), 2);
-
- /* The jump is now either unconditional or a no-op.
- If it has become a no-op, don't try to output it.
- (It would not be recognized.) */
- if (SET_SRC (body) == pc_rtx)
- {
- PUT_CODE (insn, NOTE);
- NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
- NOTE_SOURCE_FILE (insn) = 0;
- break;
- }
- else if (GET_CODE (SET_SRC (body)) == RETURN)
- /* Replace (set (pc) (return)) with (return). */
- PATTERN (insn) = body = SET_SRC (body);
-
- /* Rerecognize the instruction if it has changed. */
- if (result != 0)
- INSN_CODE (insn) = -1;
- }
-
- /* Make same adjustments to instructions that examine the
- condition codes without jumping (if this machine has them). */
-
- if (cc_status.flags != 0
- && GET_CODE (body) == SET)
- {
- switch (GET_CODE (SET_SRC (body)))
- {
- case GTU:
- case GT:
- case LTU:
- case LT:
- case GEU:
- case GE:
- case LEU:
- case LE:
- case EQ:
- case NE:
- {
- register int result;
- if (XEXP (SET_SRC (body), 0) != cc0_rtx)
- break;
- result = alter_cond (SET_SRC (body));
- if (result == 1)
- validate_change (insn, &SET_SRC (body), const_true_rtx, 0);
- else if (result == -1)
- validate_change (insn, &SET_SRC (body), const0_rtx, 0);
- else if (result == 2)
- INSN_CODE (insn) = -1;
- }
- }
- }
-#endif
-
- /* Do machine-specific peephole optimizations if desired. */
-
- if (optimize && !flag_no_peephole && !nopeepholes)
- {
- rtx next = peephole (insn);
- /* When peepholing, if there were notes within the peephole,
- emit them before the peephole. */
- if (next != 0 && next != NEXT_INSN (insn))
- {
- rtx prev = PREV_INSN (insn);
- rtx note;
-
- for (note = NEXT_INSN (insn); note != next;
- note = NEXT_INSN (note))
- final_scan_insn (note, file, optimize, prescan, nopeepholes);
-
- /* In case this is prescan, put the notes
- in proper position for later rescan. */
- note = NEXT_INSN (insn);
- PREV_INSN (note) = prev;
- NEXT_INSN (prev) = note;
- NEXT_INSN (PREV_INSN (next)) = insn;
- PREV_INSN (insn) = PREV_INSN (next);
- NEXT_INSN (insn) = next;
- PREV_INSN (next) = insn;
- }
-
- /* PEEPHOLE might have changed this. */
- body = PATTERN (insn);
- }
-
- /* Try to recognize the instruction.
- If successful, verify that the operands satisfy the
- constraints for the instruction. Crash if they don't,
- since `reload' should have changed them so that they do. */
-
- insn_code_number = recog_memoized (insn);
- insn_extract (insn);
- for (i = 0; i < insn_n_operands[insn_code_number]; i++)
- {
- if (GET_CODE (recog_operand[i]) == SUBREG)
- recog_operand[i] = alter_subreg (recog_operand[i]);
- else if (GET_CODE (recog_operand[i]) == PLUS
- || GET_CODE (recog_operand[i]) == MULT)
- recog_operand[i] = walk_alter_subreg (recog_operand[i]);
- }
-
- for (i = 0; i < insn_n_dups[insn_code_number]; i++)
- {
- if (GET_CODE (*recog_dup_loc[i]) == SUBREG)
- *recog_dup_loc[i] = alter_subreg (*recog_dup_loc[i]);
- else if (GET_CODE (*recog_dup_loc[i]) == PLUS
- || GET_CODE (*recog_dup_loc[i]) == MULT)
- *recog_dup_loc[i] = walk_alter_subreg (*recog_dup_loc[i]);
- }
-
-#ifdef REGISTER_CONSTRAINTS
- if (! constrain_operands (insn_code_number, 1))
- fatal_insn_not_found (insn);
-#endif
-
- /* Some target machines need to prescan each insn before
- it is output. */
-
-#ifdef FINAL_PRESCAN_INSN
- FINAL_PRESCAN_INSN (insn, recog_operand,
- insn_n_operands[insn_code_number]);
-#endif
-
-#ifdef HAVE_cc0
- cc_prev_status = cc_status;
-
- /* Update `cc_status' for this instruction.
- The instruction's output routine may change it further.
- If the output routine for a jump insn needs to depend
- on the cc status, it should look at cc_prev_status. */
-
- NOTICE_UPDATE_CC (body, insn);
-#endif
-
- debug_insn = insn;
-
- /* If the proper template needs to be chosen by some C code,
- run that code and get the real template. */
-
- template = insn_template[insn_code_number];
- if (template == 0)
- {
- template = (*insn_outfun[insn_code_number]) (recog_operand, insn);
-
- /* If the C code returns 0, it means that it is a jump insn
- which follows a deleted test insn, and that test insn
- needs to be reinserted. */
- if (template == 0)
- {
- if (prev_nonnote_insn (insn) != last_ignored_compare)
- abort ();
- new_block = 0;
- return prev_nonnote_insn (insn);
- }
- }
-
- /* If the template is the string "#", it means that this insn must
- be split. */
- if (template[0] == '#' && template[1] == '\0')
- {
- rtx new = try_split (body, insn, 0);
-
- /* If we didn't split the insn, go away. */
- if (new == insn && PATTERN (new) == body)
- abort ();
-
- new_block = 0;
- return new;
- }
-
- if (prescan > 0)
- break;
-
- /* Output assembler code from the template. */
-
- output_asm_insn (template, recog_operand);
-
-#if 0
- /* It's not at all clear why we did this and doing so interferes
- with tests we'd like to do to use REG_WAS_0 notes, so let's try
- with this out. */
-
- /* Mark this insn as having been output. */
- INSN_DELETED_P (insn) = 1;
-#endif
-
- debug_insn = 0;
- }
- }
- return NEXT_INSN (insn);
-}
-\f
-/* Output debugging info to the assembler file FILE
- based on the NOTE-insn INSN, assumed to be a line number. */
-
-static void
-output_source_line (file, insn)
- FILE *file;
- rtx insn;
-{
- register char *filename = NOTE_SOURCE_FILE (insn);
-
- /* Remember filename for basic block profiling.
- Filenames are allocated on the permanent obstack
- or are passed in ARGV, so we don't have to save
- the string. */
-
- if (profile_block_flag && last_filename != filename)
- bb_file_label_num = add_bb_string (filename, TRUE);
-
- last_filename = filename;
- last_linenum = NOTE_LINE_NUMBER (insn);
-
- if (write_symbols != NO_DEBUG)
- {
-#ifdef SDB_DEBUGGING_INFO
- if (write_symbols == SDB_DEBUG
-#if 0 /* People like having line numbers even in wrong file! */
- /* COFF can't handle multiple source files--lose, lose. */
- && !strcmp (filename, main_input_filename)
-#endif
- /* COFF relative line numbers must be positive. */
- && last_linenum > sdb_begin_function_line)
- {
-#ifdef ASM_OUTPUT_SOURCE_LINE
- ASM_OUTPUT_SOURCE_LINE (file, last_linenum);
-#else
- fprintf (file, "\t.ln\t%d\n",
- ((sdb_begin_function_line > -1)
- ? last_linenum - sdb_begin_function_line : 1));
-#endif
- }
-#endif
-
-#if defined (DBX_DEBUGGING_INFO)
- if (write_symbols == DBX_DEBUG)
- dbxout_source_line (file, filename, NOTE_LINE_NUMBER (insn));
-#endif
-
-#if defined (XCOFF_DEBUGGING_INFO)
- if (write_symbols == XCOFF_DEBUG)
- xcoffout_source_line (file, filename, insn);
-#endif
-
-#ifdef DWARF_DEBUGGING_INFO
- if (write_symbols == DWARF_DEBUG)
- dwarfout_line (filename, NOTE_LINE_NUMBER (insn));
-#endif
- }
-}
-\f
-/* If X is a SUBREG, replace it with a REG or a MEM,
- based on the thing it is a subreg of. */
-
-rtx
-alter_subreg (x)
- register rtx x;
-{
- register rtx y = SUBREG_REG (x);
- if (GET_CODE (y) == SUBREG)
- y = alter_subreg (y);
-
- if (GET_CODE (y) == REG)
- {
- /* If the containing reg really gets a hard reg, so do we. */
- PUT_CODE (x, REG);
- REGNO (x) = REGNO (y) + SUBREG_WORD (x);
- }
- else if (GET_CODE (y) == MEM)
- {
- register int offset = SUBREG_WORD (x) * UNITS_PER_WORD;
-#if BYTES_BIG_ENDIAN
- offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x)))
- - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (y))));
-#endif
- PUT_CODE (x, MEM);
- MEM_VOLATILE_P (x) = MEM_VOLATILE_P (y);
- XEXP (x, 0) = plus_constant (XEXP (y, 0), offset);
- }
-
- return x;
-}
-
-/* Do alter_subreg on all the SUBREGs contained in X. */
-
-static rtx
-walk_alter_subreg (x)
- rtx x;
-{
- switch (GET_CODE (x))
- {
- case PLUS:
- case MULT:
- XEXP (x, 0) = walk_alter_subreg (XEXP (x, 0));
- XEXP (x, 1) = walk_alter_subreg (XEXP (x, 1));
- break;
-
- case MEM:
- XEXP (x, 0) = walk_alter_subreg (XEXP (x, 0));
- break;
-
- case SUBREG:
- return alter_subreg (x);
- }
-
- return x;
-}
-\f
-#ifdef HAVE_cc0
-
-/* Given BODY, the body of a jump instruction, alter the jump condition
- as required by the bits that are set in cc_status.flags.
- Not all of the bits there can be handled at this level in all cases.
-
- The value is normally 0.
- 1 means that the condition has become always true.
- -1 means that the condition has become always false.
- 2 means that COND has been altered. */
-
-static int
-alter_cond (cond)
- register rtx cond;
-{
- int value = 0;
-
- if (cc_status.flags & CC_REVERSED)
- {
- value = 2;
- PUT_CODE (cond, swap_condition (GET_CODE (cond)));
- }
-
- if (cc_status.flags & CC_INVERTED)
- {
- value = 2;
- PUT_CODE (cond, reverse_condition (GET_CODE (cond)));
- }
-
- if (cc_status.flags & CC_NOT_POSITIVE)
- switch (GET_CODE (cond))
- {
- case LE:
- case LEU:
- case GEU:
- /* Jump becomes unconditional. */
- return 1;
-
- case GT:
- case GTU:
- case LTU:
- /* Jump becomes no-op. */
- return -1;
-
- case GE:
- PUT_CODE (cond, EQ);
- value = 2;
- break;
-
- case LT:
- PUT_CODE (cond, NE);
- value = 2;
- break;
- }
-
- if (cc_status.flags & CC_NOT_NEGATIVE)
- switch (GET_CODE (cond))
- {
- case GE:
- case GEU:
- /* Jump becomes unconditional. */
- return 1;
-
- case LT:
- case LTU:
- /* Jump becomes no-op. */
- return -1;
-
- case LE:
- case LEU:
- PUT_CODE (cond, EQ);
- value = 2;
- break;
-
- case GT:
- case GTU:
- PUT_CODE (cond, NE);
- value = 2;
- break;
- }
-
- if (cc_status.flags & CC_NO_OVERFLOW)
- switch (GET_CODE (cond))
- {
- case GEU:
- /* Jump becomes unconditional. */
- return 1;
-
- case LEU:
- PUT_CODE (cond, EQ);
- value = 2;
- break;
-
- case GTU:
- PUT_CODE (cond, NE);
- value = 2;
- break;
-
- case LTU:
- /* Jump becomes no-op. */
- return -1;
- }
-
- if (cc_status.flags & (CC_Z_IN_NOT_N | CC_Z_IN_N))
- switch (GET_CODE (cond))
- {
- case LE:
- case LEU:
- case GE:
- case GEU:
- case LT:
- case LTU:
- case GT:
- case GTU:
- abort ();
-
- case NE:
- PUT_CODE (cond, cc_status.flags & CC_Z_IN_N ? GE : LT);
- value = 2;
- break;
-
- case EQ:
- PUT_CODE (cond, cc_status.flags & CC_Z_IN_N ? LT : GE);
- value = 2;
- break;
- }
-
- if (cc_status.flags & CC_NOT_SIGNED)
- /* The flags are valid if signed condition operators are converted
- to unsigned. */
- switch (GET_CODE (cond))
- {
- case LE:
- PUT_CODE (cond, LEU);
- value = 2;
- break;
-
- case LT:
- PUT_CODE (cond, LTU);
- value = 2;
- break;
-
- case GT:
- PUT_CODE (cond, GTU);
- value = 2;
- break;
-
- case GE:
- PUT_CODE (cond, GEU);
- value = 2;
- break;
- }
-
- return value;
-}
-#endif
-\f
-/* Report inconsistency between the assembler template and the operands.
- In an `asm', it's the user's fault; otherwise, the compiler's fault. */
-
-void
-output_operand_lossage (str)
- char *str;
-{
- if (this_is_asm_operands)
- error_for_asm (this_is_asm_operands, "invalid `asm': %s", str);
- else
- abort ();
-}
-\f
-/* Output of assembler code from a template, and its subroutines. */
-
-/* Output text from TEMPLATE to the assembler output file,
- obeying %-directions to substitute operands taken from
- the vector OPERANDS.
-
- %N (for N a digit) means print operand N in usual manner.
- %lN means require operand N to be a CODE_LABEL or LABEL_REF
- and print the label name with no punctuation.
- %cN means require operand N to be a constant
- and print the constant expression with no punctuation.
- %aN means expect operand N to be a memory address
- (not a memory reference!) and print a reference
- to that address.
- %nN means expect operand N to be a constant
- and print a constant expression for minus the value
- of the operand, with no other punctuation. */
-
-void
-output_asm_insn (template, operands)
- char *template;
- rtx *operands;
-{
- register char *p;
- register int c, i;
-
- /* An insn may return a null string template
- in a case where no assembler code is needed. */
- if (*template == 0)
- return;
-
- p = template;
- putc ('\t', asm_out_file);
-
-#ifdef ASM_OUTPUT_OPCODE
- ASM_OUTPUT_OPCODE (asm_out_file, p);
-#endif
-
- while (c = *p++)
- switch (c)
- {
-#ifdef ASM_OUTPUT_OPCODE
- case '\n':
- putc (c, asm_out_file);
- while ((c = *p) == '\t')
- {
- putc (c, asm_out_file);
- p++;
- }
- ASM_OUTPUT_OPCODE (asm_out_file, p);
- break;
-#endif
-
-#ifdef ASSEMBLER_DIALECT
- case '{':
- /* If we want the first dialect, do nothing. Otherwise, skip
- DIALECT_NUMBER of strings ending with '|'. */
- for (i = 0; i < dialect_number; i++)
- {
- while (*p && *p++ != '|')
- ;
-
- if (*p == '|')
- p++;
- }
- break;
-
- case '|':
- /* Skip to close brace. */
- while (*p && *p++ != '}')
- ;
- break;
-
- case '}':
- break;
-#endif
-
- case '%':
- /* %% outputs a single %. */
- if (*p == '%')
- {
- p++;
- putc (c, asm_out_file);
- }
- /* %= outputs a number which is unique to each insn in the entire
- compilation. This is useful for making local labels that are
- referred to more than once in a given insn. */
- else if (*p == '=')
- {
- p++;
- fprintf (asm_out_file, "%d", insn_counter);
- }
- /* % followed by a letter and some digits
- outputs an operand in a special way depending on the letter.
- Letters `acln' are implemented directly.
- Other letters are passed to `output_operand' so that
- the PRINT_OPERAND macro can define them. */
- else if ((*p >= 'a' && *p <= 'z')
- || (*p >= 'A' && *p <= 'Z'))
- {
- int letter = *p++;
- c = atoi (p);
-
- if (! (*p >= '0' && *p <= '9'))
- output_operand_lossage ("operand number missing after %-letter");
- else if (this_is_asm_operands && c >= (unsigned) insn_noperands)
- output_operand_lossage ("operand number out of range");
- else if (letter == 'l')
- output_asm_label (operands[c]);
- else if (letter == 'a')
- output_address (operands[c]);
- else if (letter == 'c')
- {
- if (CONSTANT_ADDRESS_P (operands[c]))
- output_addr_const (asm_out_file, operands[c]);
- else
- output_operand (operands[c], 'c');
- }
- else if (letter == 'n')
- {
- if (GET_CODE (operands[c]) == CONST_INT)
- fprintf (asm_out_file,
-#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
- "%d",
-#else
- "%ld",
-#endif
- - INTVAL (operands[c]));
- else
- {
- putc ('-', asm_out_file);
- output_addr_const (asm_out_file, operands[c]);
- }
- }
- else
- output_operand (operands[c], letter);
-
- while ((c = *p) >= '0' && c <= '9') p++;
- }
- /* % followed by a digit outputs an operand the default way. */
- else if (*p >= '0' && *p <= '9')
- {
- c = atoi (p);
- if (this_is_asm_operands && c >= (unsigned) insn_noperands)
- output_operand_lossage ("operand number out of range");
- else
- output_operand (operands[c], 0);
- while ((c = *p) >= '0' && c <= '9') p++;
- }
- /* % followed by punctuation: output something for that
- punctuation character alone, with no operand.
- The PRINT_OPERAND macro decides what is actually done. */
-#ifdef PRINT_OPERAND_PUNCT_VALID_P
- else if (PRINT_OPERAND_PUNCT_VALID_P (*p))
- output_operand (NULL_RTX, *p++);
-#endif
- else
- output_operand_lossage ("invalid %%-code");
- break;
-
- default:
- putc (c, asm_out_file);
- }
-
- if (flag_print_asm_name)
- {
- /* Annotate the assembly with a comment describing the pattern and
- alternative used. */
- if (debug_insn)
- {
- register int num = INSN_CODE (debug_insn);
- fprintf (asm_out_file, " %s %d %s",
- ASM_COMMENT_START, INSN_UID (debug_insn), insn_name[num]);
- if (insn_n_alternatives[num] > 1)
- fprintf (asm_out_file, "/%d", which_alternative + 1);
-
- /* Clear this so only the first assembler insn
- of any rtl insn will get the special comment for -dp. */
- debug_insn = 0;
- }
- }
-
- putc ('\n', asm_out_file);
-}
-\f
-/* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
-
-void
-output_asm_label (x)
- rtx x;
-{
- char buf[256];
-
- if (GET_CODE (x) == LABEL_REF)
- ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (XEXP (x, 0)));
- else if (GET_CODE (x) == CODE_LABEL)
- ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x));
- else
- output_operand_lossage ("`%l' operand isn't a label");
-
- assemble_name (asm_out_file, buf);
-}
-
-/* Print operand X using machine-dependent assembler syntax.
- The macro PRINT_OPERAND is defined just to control this function.
- CODE is a non-digit that preceded the operand-number in the % spec,
- such as 'z' if the spec was `%z3'. CODE is 0 if there was no char
- between the % and the digits.
- When CODE is a non-letter, X is 0.
-
- The meanings of the letters are machine-dependent and controlled
- by PRINT_OPERAND. */
-
-static void
-output_operand (x, code)
- rtx x;
- int code;
-{
- if (x && GET_CODE (x) == SUBREG)
- x = alter_subreg (x);
-
- /* If X is a pseudo-register, abort now rather than writing trash to the
- assembler file. */
-
- if (x && GET_CODE (x) == REG && REGNO (x) >= FIRST_PSEUDO_REGISTER)
- abort ();
-
- PRINT_OPERAND (asm_out_file, x, code);
-}
-
-/* Print a memory reference operand for address X
- using machine-dependent assembler syntax.
- The macro PRINT_OPERAND_ADDRESS exists just to control this function. */
-
-void
-output_address (x)
- rtx x;
-{
- walk_alter_subreg (x);
- PRINT_OPERAND_ADDRESS (asm_out_file, x);
-}
-\f
-/* Print an integer constant expression in assembler syntax.
- Addition and subtraction are the only arithmetic
- that may appear in these expressions. */
-
-void
-output_addr_const (file, x)
- FILE *file;
- rtx x;
-{
- char buf[256];
-
- restart:
- switch (GET_CODE (x))
- {
- case PC:
- if (flag_pic)
- putc ('.', file);
- else
- abort ();
- break;
-
- case SYMBOL_REF:
- assemble_name (file, XSTR (x, 0));
- break;
-
- case LABEL_REF:
- ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (XEXP (x, 0)));
- assemble_name (file, buf);
- break;
-
- case CODE_LABEL:
- ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x));
- assemble_name (file, buf);
- break;
-
- case CONST_INT:
- fprintf (file,
-#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
- "%d",
-#else
- "%ld",
-#endif
- INTVAL (x));
- break;
-
- case CONST:
- /* This used to output parentheses around the expression,
- but that does not work on the 386 (either ATT or BSD assembler). */
- output_addr_const (file, XEXP (x, 0));
- break;
-
- case CONST_DOUBLE:
- if (GET_MODE (x) == VOIDmode)
- {
- /* We can use %d if the number is one word and positive. */
- if (CONST_DOUBLE_HIGH (x))
- fprintf (file,
-#if HOST_BITS_PER_WIDE_INT == 64
-#if HOST_BITS_PER_WIDE_INT != HOST_BITS_PER_INT
- "0x%lx%016lx",
-#else
- "0x%x%016x",
-#endif
-#else
-#if HOST_BITS_PER_WIDE_INT != HOST_BITS_PER_INT
- "0x%lx%08lx",
-#else
- "0x%x%08x",
-#endif
-#endif
- CONST_DOUBLE_HIGH (x), CONST_DOUBLE_LOW (x));
- else if (CONST_DOUBLE_LOW (x) < 0)
- fprintf (file,
-#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
- "0x%x",
-#else
- "0x%lx",
-#endif
- CONST_DOUBLE_LOW (x));
- else
- fprintf (file,
-#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
- "%d",
-#else
- "%ld",
-#endif
- CONST_DOUBLE_LOW (x));
- }
- else
- /* We can't handle floating point constants;
- PRINT_OPERAND must handle them. */
- output_operand_lossage ("floating constant misused");
- break;
-
- case PLUS:
- /* Some assemblers need integer constants to appear last (eg masm). */
- if (GET_CODE (XEXP (x, 0)) == CONST_INT)
- {
- output_addr_const (file, XEXP (x, 1));
- if (INTVAL (XEXP (x, 0)) >= 0)
- fprintf (file, "+");
- output_addr_const (file, XEXP (x, 0));
- }
- else
- {
- output_addr_const (file, XEXP (x, 0));
- if (INTVAL (XEXP (x, 1)) >= 0)
- fprintf (file, "+");
- output_addr_const (file, XEXP (x, 1));
- }
- break;
-
- case MINUS:
- /* Avoid outputting things like x-x or x+5-x,
- since some assemblers can't handle that. */
- x = simplify_subtraction (x);
- if (GET_CODE (x) != MINUS)
- goto restart;
-
- output_addr_const (file, XEXP (x, 0));
- fprintf (file, "-");
- if (GET_CODE (XEXP (x, 1)) == CONST_INT
- && INTVAL (XEXP (x, 1)) < 0)
- {
- fprintf (file, ASM_OPEN_PAREN);
- output_addr_const (file, XEXP (x, 1));
- fprintf (file, ASM_CLOSE_PAREN);
- }
- else
- output_addr_const (file, XEXP (x, 1));
- break;
-
- case ZERO_EXTEND:
- case SIGN_EXTEND:
- output_addr_const (file, XEXP (x, 0));
- break;
-
- default:
- output_operand_lossage ("invalid expression as operand");
- }
-}
-\f
-/* A poor man's fprintf, with the added features of %I, %R, %L, and %U.
- %R prints the value of REGISTER_PREFIX.
- %L prints the value of LOCAL_LABEL_PREFIX.
- %U prints the value of USER_LABEL_PREFIX.
- %I prints the value of IMMEDIATE_PREFIX.
- %O runs ASM_OUTPUT_OPCODE to transform what follows in the string.
- Also supported are %d, %x, %s, %e, %f, %g and %%.
-
- We handle alternate assembler dialects here, just like output_asm_insn. */
-
-void
-asm_fprintf VPROTO((FILE *file, char *p, ...))
-{
-#ifndef __STDC__
- FILE *file;
- char *p;
-#endif
- va_list argptr;
- char buf[10];
- char *q, c;
- int i;
-
- VA_START (argptr, p);
-
-#ifndef __STDC__
- file = va_arg (argptr, FILE*);
- p = va_arg (argptr, char*);
-#endif
-
- buf[0] = '%';
-
- while (c = *p++)
- switch (c)
- {
-#ifdef ASSEMBLER_DIALECT
- case '{':
- /* If we want the first dialect, do nothing. Otherwise, skip
- DIALECT_NUMBER of strings ending with '|'. */
- for (i = 0; i < dialect_number; i++)
- {
- while (*p && *p++ != '|')
- ;
-
- if (*p == '|')
- p++;
- }
- break;
-
- case '|':
- /* Skip to close brace. */
- while (*p && *p++ != '}')
- ;
- break;
-
- case '}':
- break;
-#endif
-
- case '%':
- c = *p++;
- q = &buf[1];
- while ((c >= '0' && c <= '9') || c == '.')
- {
- *q++ = c;
- c = *p++;
- }
- switch (c)
- {
- case '%':
- fprintf (file, "%%");
- break;
-
- case 'd': case 'i': case 'u':
- case 'x': case 'p': case 'X':
- case 'o':
- *q++ = c;
- *q = 0;
- fprintf (file, buf, va_arg (argptr, int));
- break;
-
- case 'w':
- /* This is a prefix to the 'd', 'i', 'u', 'x', 'p', and 'X' cases,
- but we do not check for those cases. It means that the value
- is a HOST_WIDE_INT, which may be either `int' or `long'. */
-
-#if HOST_BITS_PER_WIDE_INT != HOST_BITS_PER_INT
- *q++ = 'l';
-#endif
-
- *q++ = *p++;
- *q = 0;
- fprintf (file, buf, va_arg (argptr, HOST_WIDE_INT));
- break;
-
- case 'l':
- *q++ = c;
- *q++ = *p++;
- *q = 0;
- fprintf (file, buf, va_arg (argptr, long));
- break;
-
- case 'e':
- case 'f':
- case 'g':
- *q++ = c;
- *q = 0;
- fprintf (file, buf, va_arg (argptr, double));
- break;
-
- case 's':
- *q++ = c;
- *q = 0;
- fprintf (file, buf, va_arg (argptr, char *));
- break;
-
- case 'O':
-#ifdef ASM_OUTPUT_OPCODE
- ASM_OUTPUT_OPCODE (asm_out_file, p);
-#endif
- break;
-
- case 'R':
-#ifdef REGISTER_PREFIX
- fprintf (file, "%s", REGISTER_PREFIX);
-#endif
- break;
-
- case 'I':
-#ifdef IMMEDIATE_PREFIX
- fprintf (file, "%s", IMMEDIATE_PREFIX);
-#endif
- break;
-
- case 'L':
-#ifdef LOCAL_LABEL_PREFIX
- fprintf (file, "%s", LOCAL_LABEL_PREFIX);
-#endif
- break;
-
- case 'U':
-#ifdef USER_LABEL_PREFIX
- fprintf (file, "%s", USER_LABEL_PREFIX);
-#endif
- break;
-
- default:
- abort ();
- }
- break;
-
- default:
- fputc (c, file);
- }
-}
-\f
-/* Split up a CONST_DOUBLE or integer constant rtx
- into two rtx's for single words,
- storing in *FIRST the word that comes first in memory in the target
- and in *SECOND the other. */
-
-void
-split_double (value, first, second)
- rtx value;
- rtx *first, *second;
-{
- if (GET_CODE (value) == CONST_INT)
- {
- /* The rule for using CONST_INT for a wider mode
- is that we regard the value as signed.
- So sign-extend it. */
- rtx high = (INTVAL (value) < 0 ? constm1_rtx : const0_rtx);
-#if WORDS_BIG_ENDIAN
- *first = high;
- *second = value;
-#else
- *first = value;
- *second = high;
-#endif
- }
- else if (GET_CODE (value) != CONST_DOUBLE)
- {
-#if WORDS_BIG_ENDIAN
- *first = const0_rtx;
- *second = value;
-#else
- *first = value;
- *second = const0_rtx;
-#endif
- }
- else if (GET_MODE (value) == VOIDmode
- /* This is the old way we did CONST_DOUBLE integers. */
- || GET_MODE_CLASS (GET_MODE (value)) == MODE_INT)
- {
- /* In an integer, the words are defined as most and least significant.
- So order them by the target's convention. */
-#if WORDS_BIG_ENDIAN
- *first = GEN_INT (CONST_DOUBLE_HIGH (value));
- *second = GEN_INT (CONST_DOUBLE_LOW (value));
-#else
- *first = GEN_INT (CONST_DOUBLE_LOW (value));
- *second = GEN_INT (CONST_DOUBLE_HIGH (value));
-#endif
- }
- else
- {
-#ifdef REAL_ARITHMETIC
- REAL_VALUE_TYPE r; long l[2];
- REAL_VALUE_FROM_CONST_DOUBLE (r, value);
-
- /* Note, this converts the REAL_VALUE_TYPE to the target's
- format, splits up the floating point double and outputs
- exactly 32 bits of it into each of l[0] and l[1] --
- not necessarily BITS_PER_WORD bits. */
- REAL_VALUE_TO_TARGET_DOUBLE (r, l);
-
- *first = GEN_INT ((HOST_WIDE_INT) l[0]);
- *second = GEN_INT ((HOST_WIDE_INT) l[1]);
-#else
- if ((HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
- || HOST_BITS_PER_WIDE_INT != BITS_PER_WORD)
- && ! flag_pretend_float)
- abort ();
-
-#if defined (HOST_WORDS_BIG_ENDIAN) == WORDS_BIG_ENDIAN
- /* Host and target agree => no need to swap. */
- *first = GEN_INT (CONST_DOUBLE_LOW (value));
- *second = GEN_INT (CONST_DOUBLE_HIGH (value));
-#else
- *second = GEN_INT (CONST_DOUBLE_LOW (value));
- *first = GEN_INT (CONST_DOUBLE_HIGH (value));
-#endif
-#endif /* no REAL_ARITHMETIC */
- }
-}
-\f
-/* Return nonzero if this function has no function calls. */
-
-int
-leaf_function_p ()
-{
- rtx insn;
-
- if (profile_flag || profile_block_flag)
- return 0;
-
- for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
- {
- if (GET_CODE (insn) == CALL_INSN)
- return 0;
- if (GET_CODE (insn) == INSN
- && GET_CODE (PATTERN (insn)) == SEQUENCE
- && GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == CALL_INSN)
- return 0;
- }
- for (insn = current_function_epilogue_delay_list; insn; insn = XEXP (insn, 1))
- {
- if (GET_CODE (XEXP (insn, 0)) == CALL_INSN)
- return 0;
- if (GET_CODE (XEXP (insn, 0)) == INSN
- && GET_CODE (PATTERN (XEXP (insn, 0))) == SEQUENCE
- && GET_CODE (XVECEXP (PATTERN (XEXP (insn, 0)), 0, 0)) == CALL_INSN)
- return 0;
- }
-
- return 1;
-}
-
-/* On some machines, a function with no call insns
- can run faster if it doesn't create its own register window.
- When output, the leaf function should use only the "output"
- registers. Ordinarily, the function would be compiled to use
- the "input" registers to find its arguments; it is a candidate
- for leaf treatment if it uses only the "input" registers.
- Leaf function treatment means renumbering so the function
- uses the "output" registers instead. */
-
-#ifdef LEAF_REGISTERS
-
-static char permitted_reg_in_leaf_functions[] = LEAF_REGISTERS;
-
-/* Return 1 if this function uses only the registers that can be
- safely renumbered. */
-
-int
-only_leaf_regs_used ()
-{
- int i;
-
- for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
- {
- if ((regs_ever_live[i] || global_regs[i])
- && ! permitted_reg_in_leaf_functions[i])
- return 0;
- }
- return 1;
-}
-
-/* Scan all instructions and renumber all registers into those
- available in leaf functions. */
-
-static void
-leaf_renumber_regs (first)
- rtx first;
-{
- rtx insn;
-
- /* Renumber only the actual patterns.
- The reg-notes can contain frame pointer refs,
- and renumbering them could crash, and should not be needed. */
- for (insn = first; insn; insn = NEXT_INSN (insn))
- if (GET_RTX_CLASS (GET_CODE (insn)) == 'i')
- leaf_renumber_regs_insn (PATTERN (insn));
- for (insn = current_function_epilogue_delay_list; insn; insn = XEXP (insn, 1))
- if (GET_RTX_CLASS (GET_CODE (XEXP (insn, 0))) == 'i')
- leaf_renumber_regs_insn (PATTERN (XEXP (insn, 0)));
-}
-
-/* Scan IN_RTX and its subexpressions, and renumber all regs into those
- available in leaf functions. */
-
-void
-leaf_renumber_regs_insn (in_rtx)
- register rtx in_rtx;
-{
- register int i, j;
- register char *format_ptr;
-
- if (in_rtx == 0)
- return;
-
- /* Renumber all input-registers into output-registers.
- renumbered_regs would be 1 for an output-register;
- they */
-
- if (GET_CODE (in_rtx) == REG)
- {
- int newreg;
-
- /* Don't renumber the same reg twice. */
- if (in_rtx->used)
- return;
-
- newreg = REGNO (in_rtx);
- /* Don't try to renumber pseudo regs. It is possible for a pseudo reg
- to reach here as part of a REG_NOTE. */
- if (newreg >= FIRST_PSEUDO_REGISTER)
- {
- in_rtx->used = 1;
- return;
- }
- newreg = LEAF_REG_REMAP (newreg);
- if (newreg < 0)
- abort ();
- regs_ever_live[REGNO (in_rtx)] = 0;
- regs_ever_live[newreg] = 1;
- REGNO (in_rtx) = newreg;
- in_rtx->used = 1;
- }
-
- if (GET_RTX_CLASS (GET_CODE (in_rtx)) == 'i')
- {
- /* Inside a SEQUENCE, we find insns.
- Renumber just the patterns of these insns,
- just as we do for the top-level insns. */
- leaf_renumber_regs_insn (PATTERN (in_rtx));
- return;
- }
-
- format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx));
-
- for (i = 0; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
- switch (*format_ptr++)
- {
- case 'e':
- leaf_renumber_regs_insn (XEXP (in_rtx, i));
- break;
-
- case 'E':
- if (NULL != XVEC (in_rtx, i))
- {
- for (j = 0; j < XVECLEN (in_rtx, i); j++)
- leaf_renumber_regs_insn (XVECEXP (in_rtx, i, j));
- }
- break;
-
- case 'S':
- case 's':
- case '0':
- case 'i':
- case 'w':
- case 'n':
- case 'u':
- break;
-
- default:
- abort ();
- }
-}
-#endif
projects / platform / upstream / gcc.git / commitdiff