1 /* Convert RTL to assembler code and output it, for GNU compiler.
2 Copyright (C) 1987, 88, 89, 92, 93, 1994 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* This is the final pass of the compiler.
22 It looks at the rtl code for a function and outputs assembler code.
24 Call `final_start_function' to output the assembler code for function entry,
25 `final' to output assembler code for some RTL code,
26 `final_end_function' to output assembler code for function exit.
27 If a function is compiled in several pieces, each piece is
28 output separately with `final'.
30 Some optimizations are also done at this level.
31 Move instructions that were made unnecessary by good register allocation
32 are detected and omitted from the output. (Though most of these
33 are removed by the last jump pass.)
35 Instructions to set the condition codes are omitted when it can be
36 seen that the condition codes already had the desired values.
38 In some cases it is sufficient if the inherited condition codes
39 have related values, but this may require the following insn
40 (the one that tests the condition codes) to be modified.
42 The code for the function prologue and epilogue are generated
43 directly as assembler code by the macros FUNCTION_PROLOGUE and
44 FUNCTION_EPILOGUE. Those instructions never exist as rtl. */
55 #include "insn-config.h"
56 #include "insn-flags.h"
57 #include "insn-attr.h"
58 #include "insn-codes.h"
60 #include "conditions.h"
63 #include "hard-reg-set.h"
71 /* Get N_SLINE and N_SOL from stab.h if we can expect the file to exist. */
72 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
73 #if defined (USG) || defined (NO_STAB_H)
74 #include "gstab.h" /* If doing DBX on sysV, use our own stab.h. */
76 #include <stab.h> /* On BSD, use the system's stab.h. */
78 #endif /* DBX_DEBUGGING_INFO || XCOFF_DEBUGGING_INFO */
80 #ifdef XCOFF_DEBUGGING_INFO
84 /* .stabd code for line number. */
89 /* .stabs code for included file name. */
95 #define INT_TYPE_SIZE BITS_PER_WORD
98 /* If we aren't using cc0, CC_STATUS_INIT shouldn't exist. So define a
99 null default for it to save conditionalization later. */
100 #ifndef CC_STATUS_INIT
101 #define CC_STATUS_INIT
104 /* How to start an assembler comment. */
105 #ifndef ASM_COMMENT_START
106 #define ASM_COMMENT_START ";#"
109 /* Is the given character a logical line separator for the assembler? */
110 #ifndef IS_ASM_LOGICAL_LINE_SEPARATOR
111 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C) ((C) == ';')
115 void output_asm_insn ();
117 static rtx walk_alter_subreg ();
118 static int alter_cond ();
119 void output_asm_label ();
120 static void output_operand ();
121 void output_address ();
122 void output_addr_const ();
123 static void output_source_line ();
124 rtx final_scan_insn ();
125 void profile_function ();
126 static void profile_after_prologue ();
128 #ifdef HAVE_ATTR_length
129 static int asm_insn_count ();
132 /* Nonzero means this function is a leaf function, with no function calls.
133 This variable exists to be examined in FUNCTION_PROLOGUE
134 and FUNCTION_EPILOGUE. Always zero, unless set by some action. */
137 int leaf_function_p ();
139 #ifdef LEAF_REGISTERS
140 int only_leaf_regs_used ();
141 static void leaf_renumber_regs ();
142 void leaf_renumber_regs_insn ();
145 /* Last insn processed by final_scan_insn. */
146 static rtx debug_insn = 0;
148 /* Line number of last NOTE. */
149 static int last_linenum;
151 /* Filename of last NOTE. */
152 static char *last_filename;
154 /* Number of basic blocks seen so far;
155 used if profile_block_flag is set. */
156 static int count_basic_blocks;
158 /* Nonzero while outputting an `asm' with operands.
159 This means that inconsistencies are the user's fault, so don't abort.
160 The precise value is the insn being output, to pass to error_for_asm. */
161 static rtx this_is_asm_operands;
163 /* Number of operands of this insn, for an `asm' with operands. */
164 static int insn_noperands;
166 /* Compare optimization flag. */
168 static rtx last_ignored_compare = 0;
170 /* Flag indicating this insn is the start of a new basic block. */
172 static int new_block = 1;
174 /* All the symbol-blocks (levels of scoping) in the compilation
175 are assigned sequence numbers in order of appearance of the
176 beginnings of the symbol-blocks. Both final and dbxout do this,
177 and assume that they will both give the same number to each block.
178 Final uses these sequence numbers to generate assembler label names
179 LBBnnn and LBEnnn for the beginning and end of the symbol-block.
180 Dbxout uses the sequence numbers to generate references to the same labels
181 from the dbx debugging information.
183 Sdb records this level at the beginning of each function,
184 in order to find the current level when recursing down declarations.
185 It outputs the block beginning and endings
186 at the point in the asm file where the blocks would begin and end. */
188 int next_block_index;
190 /* Assign a unique number to each insn that is output.
191 This can be used to generate unique local labels. */
193 static int insn_counter = 0;
196 /* This variable contains machine-dependent flags (defined in tm.h)
197 set and examined by output routines
198 that describe how to interpret the condition codes properly. */
202 /* During output of an insn, this contains a copy of cc_status
203 from before the insn. */
205 CC_STATUS cc_prev_status;
208 /* Indexed by hardware reg number, is 1 if that register is ever
209 used in the current function.
211 In life_analysis, or in stupid_life_analysis, this is set
212 up to record the hard regs used explicitly. Reload adds
213 in the hard regs used for holding pseudo regs. Final uses
214 it to generate the code in the function prologue and epilogue
215 to save and restore registers as needed. */
217 char regs_ever_live[FIRST_PSEUDO_REGISTER];
219 /* Nonzero means current function must be given a frame pointer.
220 Set in stmt.c if anything is allocated on the stack there.
221 Set in reload1.c if anything is allocated on the stack there. */
223 int frame_pointer_needed;
225 /* Assign unique numbers to labels generated for profiling. */
227 int profile_label_no;
229 /* Length so far allocated in PENDING_BLOCKS. */
231 static int max_block_depth;
233 /* Stack of sequence numbers of symbol-blocks of which we have seen the
234 beginning but not yet the end. Sequence numbers are assigned at
235 the beginning; this stack allows us to find the sequence number
236 of a block that is ending. */
238 static int *pending_blocks;
240 /* Number of elements currently in use in PENDING_BLOCKS. */
242 static int block_depth;
244 /* Nonzero if have enabled APP processing of our assembler output. */
248 /* If we are outputting an insn sequence, this contains the sequence rtx.
253 #ifdef ASSEMBLER_DIALECT
255 /* Number of the assembler dialect to use, starting at 0. */
256 static int dialect_number;
259 /* Indexed by line number, nonzero if there is a note for that line. */
261 static char *line_note_exists;
263 /* Linked list to hold line numbers for each basic block. */
266 struct bb_list *next; /* pointer to next basic block */
267 int line_num; /* line number */
268 int file_label_num; /* LPBC<n> label # for stored filename */
269 int func_label_num; /* LPBC<n> label # for stored function name */
272 static struct bb_list *bb_head = 0; /* Head of basic block list */
273 static struct bb_list **bb_tail = &bb_head; /* Ptr to store next bb ptr */
274 static int bb_file_label_num = -1; /* Current label # for file */
275 static int bb_func_label_num = -1; /* Current label # for func */
277 /* Linked list to hold the strings for each file and function name output. */
280 struct bb_str *next; /* pointer to next string */
281 char *string; /* string */
282 int label_num; /* label number */
283 int length; /* string length */
286 static struct bb_str *sbb_head = 0; /* Head of string list. */
287 static struct bb_str **sbb_tail = &sbb_head; /* Ptr to store next bb str */
288 static int sbb_label_num = 0; /* Last label used */
290 static int add_bb_string PROTO((char *, int));
291 static void add_bb PROTO((FILE *));
294 /* Initialize data in final at the beginning of a compilation. */
297 init_final (filename)
300 next_block_index = 2;
302 max_block_depth = 20;
303 pending_blocks = (int *) xmalloc (20 * sizeof *pending_blocks);
306 #ifdef ASSEMBLER_DIALECT
307 dialect_number = ASSEMBLER_DIALECT;
311 /* Called at end of source file,
312 to output the block-profiling table for this entire compilation. */
320 if (profile_block_flag)
323 int align = exact_log2 (BIGGEST_ALIGNMENT / BITS_PER_UNIT);
324 int size = (INT_TYPE_SIZE / BITS_PER_UNIT) * count_basic_blocks;
329 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
330 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
331 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
335 /* Output the main header, of 10 words:
336 0: 1 if this file's initialized, else 0.
337 1: address of file name (LPBX1).
338 2: address of table of counts (LPBX2).
339 3: number of counts in the table.
340 4: always 0, for compatibility with Sun.
342 The following are GNU extensions:
344 5: address of table of start addrs of basic blocks (LPBX3).
345 6: Number of bytes in this header.
346 7: address of table of function names (LPBX4).
347 8: address of table of line numbers (LPBX5) or 0.
348 9: address of table of file names (LPBX6) or 0. */
350 ASM_OUTPUT_ALIGN (asm_out_file, align);
352 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 0);
354 assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
356 /* address of filename */
357 ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 1);
358 assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
360 /* address of count table */
361 ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 2);
362 assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
364 /* count of the # of basic blocks */
365 assemble_integer (GEN_INT (count_basic_blocks), UNITS_PER_WORD, 1);
367 /* zero word (link field) */
368 assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
370 /* address of basic block start address table */
371 ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 3);
372 assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
374 /* byte count for extended structure. */
375 assemble_integer (GEN_INT (10 * UNITS_PER_WORD), UNITS_PER_WORD, 1);
377 /* address of function name table */
378 ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 4);
379 assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
381 /* address of line number and filename tables if debugging. */
382 if (write_symbols != NO_DEBUG)
384 ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 5);
385 assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
386 ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 6);
387 assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
391 assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
392 assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
395 /* Output the file name changing the suffix to .d for Sun tcov
397 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 1);
399 int len = strlen (filename);
400 char *data_file = (char *) alloca (len + 3);
401 strcpy (data_file, filename);
402 strip_off_ending (data_file, len);
403 strcat (data_file, ".d");
404 assemble_string (data_file, strlen (data_file) + 1);
407 /* Make space for the table of counts. */
408 if (flag_no_common || size == 0)
410 /* Realign data section. */
411 ASM_OUTPUT_ALIGN (asm_out_file, align);
412 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 2);
414 assemble_zeros (size);
418 ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 2);
419 #ifdef ASM_OUTPUT_SHARED_LOCAL
420 if (flag_shared_data)
421 ASM_OUTPUT_SHARED_LOCAL (asm_out_file, name, size, rounded);
424 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
425 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size,
428 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
432 /* Output any basic block strings */
433 readonly_data_section ();
436 ASM_OUTPUT_ALIGN (asm_out_file, align);
437 for (sptr = sbb_head; sptr != 0; sptr = sptr->next)
439 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBC", sptr->label_num);
440 assemble_string (sptr->string, sptr->length);
444 /* Output the table of addresses. */
445 /* Realign in new section */
446 ASM_OUTPUT_ALIGN (asm_out_file, align);
447 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 3);
448 for (i = 0; i < count_basic_blocks; i++)
450 ASM_GENERATE_INTERNAL_LABEL (name, "LPB", i);
451 assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name),
455 /* Output the table of function names. */
456 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 4);
457 for ((ptr = bb_head), (i = 0); ptr != 0; (ptr = ptr->next), i++)
459 if (ptr->func_label_num >= 0)
461 ASM_GENERATE_INTERNAL_LABEL (name, "LPBC", ptr->func_label_num);
462 assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name),
466 assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
469 for ( ; i < count_basic_blocks; i++)
470 assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
472 if (write_symbols != NO_DEBUG)
474 /* Output the table of line numbers. */
475 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 5);
476 for ((ptr = bb_head), (i = 0); ptr != 0; (ptr = ptr->next), i++)
477 assemble_integer (GEN_INT (ptr->line_num), UNITS_PER_WORD, 1);
479 for ( ; i < count_basic_blocks; i++)
480 assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
482 /* Output the table of file names. */
483 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 6);
484 for ((ptr = bb_head), (i = 0); ptr != 0; (ptr = ptr->next), i++)
486 if (ptr->file_label_num >= 0)
488 ASM_GENERATE_INTERNAL_LABEL (name, "LPBC", ptr->file_label_num);
489 assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name),
493 assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
496 for ( ; i < count_basic_blocks; i++)
497 assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
500 /* End with the address of the table of addresses,
501 so we can find it easily, as the last word in the file's text. */
502 ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 3);
503 assemble_integer (gen_rtx (SYMBOL_REF, Pmode, name), UNITS_PER_WORD, 1);
507 /* Enable APP processing of subsequent output.
508 Used before the output from an `asm' statement. */
515 fprintf (asm_out_file, ASM_APP_ON);
520 /* Enable APP processing of subsequent output.
521 Called from varasm.c before most kinds of output. */
528 fprintf (asm_out_file, ASM_APP_OFF);
533 /* Return the number of slots filled in the current
534 delayed branch sequence (we don't count the insn needing the
535 delay slot). Zero if not in a delayed branch sequence. */
539 dbr_sequence_length ()
541 if (final_sequence != 0)
542 return XVECLEN (final_sequence, 0) - 1;
548 /* The next two pages contain routines used to compute the length of an insn
549 and to shorten branches. */
551 /* Arrays for insn lengths, and addresses. The latter is referenced by
552 `insn_current_length'. */
554 static short *insn_lengths;
557 /* Address of insn being processed. Used by `insn_current_length'. */
558 int insn_current_address;
560 /* Indicate the branch shortening hasn't yet been done. */
568 /* Obtain the current length of an insn. If branch shortening has been done,
569 get its actual length. Otherwise, get its maximum length. */
572 get_attr_length (insn)
575 #ifdef HAVE_ATTR_length
581 return insn_lengths[INSN_UID (insn)];
583 switch (GET_CODE (insn))
591 length = insn_default_length (insn);
595 body = PATTERN (insn);
596 if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
598 /* This only takes room if jump tables go into the text section. */
599 #if !defined(READONLY_DATA_SECTION) || defined(JUMP_TABLES_IN_TEXT_SECTION)
600 length = (XVECLEN (body, GET_CODE (body) == ADDR_DIFF_VEC)
601 * GET_MODE_SIZE (GET_MODE (body)));
603 /* Be pessimistic and assume worst-case alignment. */
604 length += (GET_MODE_SIZE (GET_MODE (body)) - 1);
610 length = insn_default_length (insn);
614 body = PATTERN (insn);
615 if (GET_CODE (body) == USE || GET_CODE (body) == CLOBBER)
618 else if (GET_CODE (body) == ASM_INPUT || asm_noperands (body) >= 0)
619 length = asm_insn_count (body) * insn_default_length (insn);
620 else if (GET_CODE (body) == SEQUENCE)
621 for (i = 0; i < XVECLEN (body, 0); i++)
622 length += get_attr_length (XVECEXP (body, 0, i));
624 length = insn_default_length (insn);
627 #ifdef ADJUST_INSN_LENGTH
628 ADJUST_INSN_LENGTH (insn, length);
631 #else /* not HAVE_ATTR_length */
633 #endif /* not HAVE_ATTR_length */
636 /* Make a pass over all insns and compute their actual lengths by shortening
637 any branches of variable length if possible. */
639 /* Give a default value for the lowest address in a function. */
641 #ifndef FIRST_INSN_ADDRESS
642 #define FIRST_INSN_ADDRESS 0
646 shorten_branches (first)
649 #ifdef HAVE_ATTR_length
651 int something_changed = 1;
653 char *varying_length;
657 /* Compute maximum UID and allocate arrays. */
658 for (insn = first; insn; insn = NEXT_INSN (insn))
659 if (INSN_UID (insn) > max_uid)
660 max_uid = INSN_UID (insn);
663 insn_lengths = (short *) oballoc (max_uid * sizeof (short));
664 insn_addresses = (int *) oballoc (max_uid * sizeof (int));
665 varying_length = (char *) oballoc (max_uid * sizeof (char));
667 /* Compute initial lengths, addresses, and varying flags for each insn. */
668 for (insn_current_address = FIRST_INSN_ADDRESS, insn = first;
670 insn_current_address += insn_lengths[uid], insn = NEXT_INSN (insn))
672 uid = INSN_UID (insn);
673 insn_addresses[uid] = insn_current_address;
674 insn_lengths[uid] = 0;
675 varying_length[uid] = 0;
677 if (GET_CODE (insn) == NOTE || GET_CODE (insn) == BARRIER
678 || GET_CODE (insn) == CODE_LABEL)
681 body = PATTERN (insn);
682 if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
684 /* This only takes room if read-only data goes into the text
686 #if !defined(READONLY_DATA_SECTION) || defined(JUMP_TABLES_IN_TEXT_SECTION)
687 int unitsize = GET_MODE_SIZE (GET_MODE (body));
689 insn_lengths[uid] = (XVECLEN (body, GET_CODE (body) == ADDR_DIFF_VEC)
690 * GET_MODE_SIZE (GET_MODE (body)));
692 /* Account for possible alignment. */
694 += unitsize - (insn_current_address & (unitsize - 1));
699 else if (asm_noperands (body) >= 0)
700 insn_lengths[uid] = asm_insn_count (body) * insn_default_length (insn);
701 else if (GET_CODE (body) == SEQUENCE)
704 int const_delay_slots;
706 const_delay_slots = const_num_delay_slots (XVECEXP (body, 0, 0));
708 const_delay_slots = 0;
710 /* Inside a delay slot sequence, we do not do any branch shortening
711 if the shortening could change the number of delay slots
713 for (i = 0; i < XVECLEN (body, 0); i++)
715 rtx inner_insn = XVECEXP (body, 0, i);
716 int inner_uid = INSN_UID (inner_insn);
719 if (asm_noperands (PATTERN (XVECEXP (body, 0, i))) >= 0)
720 inner_length = (asm_insn_count (PATTERN (inner_insn))
721 * insn_default_length (inner_insn));
723 inner_length = insn_default_length (inner_insn);
725 insn_lengths[inner_uid] = inner_length;
726 if (const_delay_slots)
728 if ((varying_length[inner_uid]
729 = insn_variable_length_p (inner_insn)) != 0)
730 varying_length[uid] = 1;
731 insn_addresses[inner_uid] = (insn_current_address +
735 varying_length[inner_uid] = 0;
736 insn_lengths[uid] += inner_length;
739 else if (GET_CODE (body) != USE && GET_CODE (body) != CLOBBER)
741 insn_lengths[uid] = insn_default_length (insn);
742 varying_length[uid] = insn_variable_length_p (insn);
745 /* If needed, do any adjustment. */
746 #ifdef ADJUST_INSN_LENGTH
747 ADJUST_INSN_LENGTH (insn, insn_lengths[uid]);
751 /* Now loop over all the insns finding varying length insns. For each,
752 get the current insn length. If it has changed, reflect the change.
753 When nothing changes for a full pass, we are done. */
755 while (something_changed)
757 something_changed = 0;
758 for (insn_current_address = FIRST_INSN_ADDRESS, insn = first;
760 insn = NEXT_INSN (insn))
765 uid = INSN_UID (insn);
766 insn_addresses[uid] = insn_current_address;
767 if (! varying_length[uid])
769 insn_current_address += insn_lengths[uid];
772 if (GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == SEQUENCE)
776 body = PATTERN (insn);
778 for (i = 0; i < XVECLEN (body, 0); i++)
780 rtx inner_insn = XVECEXP (body, 0, i);
781 int inner_uid = INSN_UID (inner_insn);
784 insn_addresses[inner_uid] = insn_current_address;
786 /* insn_current_length returns 0 for insns with a
787 non-varying length. */
788 if (! varying_length[inner_uid])
789 inner_length = insn_lengths[inner_uid];
791 inner_length = insn_current_length (inner_insn);
793 if (inner_length != insn_lengths[inner_uid])
795 insn_lengths[inner_uid] = inner_length;
796 something_changed = 1;
798 insn_current_address += insn_lengths[inner_uid];
799 new_length += inner_length;
804 new_length = insn_current_length (insn);
805 insn_current_address += new_length;
808 #ifdef SHORTEN_WITH_ADJUST_INSN_LENGTH
809 #ifdef ADJUST_INSN_LENGTH
810 /* If needed, do any adjustment. */
811 tmp_length = new_length;
812 ADJUST_INSN_LENGTH (insn, new_length);
813 insn_current_address += (new_length - tmp_length);
817 if (new_length != insn_lengths[uid])
819 insn_lengths[uid] = new_length;
820 something_changed = 1;
824 #endif /* HAVE_ATTR_length */
827 #ifdef HAVE_ATTR_length
828 /* Given the body of an INSN known to be generated by an ASM statement, return
829 the number of machine instructions likely to be generated for this insn.
830 This is used to compute its length. */
833 asm_insn_count (body)
839 for (template = decode_asm_operands (body, NULL_PTR, NULL_PTR,
841 *template; template++)
842 if (IS_ASM_LOGICAL_LINE_SEPARATOR(*template) || *template == '\n')
849 /* Output assembler code for the start of a function,
850 and initialize some of the variables in this file
851 for the new function. The label for the function and associated
852 assembler pseudo-ops have already been output in `assemble_start_function'.
854 FIRST is the first insn of the rtl for the function being compiled.
855 FILE is the file to write assembler code to.
856 OPTIMIZE is nonzero if we should eliminate redundant
857 test and compare insns. */
860 final_start_function (first, file, optimize)
867 this_is_asm_operands = 0;
869 #ifdef NON_SAVING_SETJMP
870 /* A function that calls setjmp should save and restore all the
871 call-saved registers on a system where longjmp clobbers them. */
872 if (NON_SAVING_SETJMP && current_function_calls_setjmp)
876 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
877 if (!call_used_regs[i] && !call_fixed_regs[i])
878 regs_ever_live[i] = 1;
882 /* Initial line number is supposed to be output
883 before the function's prologue and label
884 so that the function's address will not appear to be
885 in the last statement of the preceding function. */
886 if (NOTE_LINE_NUMBER (first) != NOTE_INSN_DELETED)
888 if (write_symbols == SDB_DEBUG)
889 /* For sdb, let's not, but say we did.
890 We need to set last_linenum for sdbout_function_begin,
891 but we can't have an actual line number before the .bf symbol.
892 (sdb_begin_function_line is not set,
893 and other compilers don't do it.) */
894 last_linenum = NOTE_LINE_NUMBER (first);
895 #ifdef XCOFF_DEBUGGING_INFO
896 else if (write_symbols == XCOFF_DEBUG)
898 last_linenum = NOTE_LINE_NUMBER (first);
899 xcoffout_output_first_source_line (file, last_linenum);
903 output_source_line (file, first);
906 #ifdef LEAF_REG_REMAP
908 leaf_renumber_regs (first);
911 /* The Sun386i and perhaps other machines don't work right
912 if the profiling code comes after the prologue. */
913 #ifdef PROFILE_BEFORE_PROLOGUE
915 profile_function (file);
916 #endif /* PROFILE_BEFORE_PROLOGUE */
918 #ifdef FUNCTION_PROLOGUE
919 /* First output the function prologue: code to set up the stack frame. */
920 FUNCTION_PROLOGUE (file, get_frame_size ());
923 #if defined (SDB_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
924 if (write_symbols == SDB_DEBUG || write_symbols == XCOFF_DEBUG)
925 next_block_index = 1;
928 /* If the machine represents the prologue as RTL, the profiling code must
929 be emitted when NOTE_INSN_PROLOGUE_END is scanned. */
933 profile_after_prologue (file);
937 /* If we are doing basic block profiling, remember a printable version
938 of the function name. */
939 if (profile_block_flag)
941 char *junk = "function";
943 add_bb_string ((*decl_printable_name) (current_function_decl, &junk), FALSE);
948 profile_after_prologue (file)
951 #ifdef FUNCTION_BLOCK_PROFILER
952 if (profile_block_flag)
954 FUNCTION_BLOCK_PROFILER (file, profile_label_no);
956 #endif /* FUNCTION_BLOCK_PROFILER */
958 #ifndef PROFILE_BEFORE_PROLOGUE
960 profile_function (file);
961 #endif /* not PROFILE_BEFORE_PROLOGUE */
965 profile_function (file)
968 int align = MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD);
969 int sval = current_function_returns_struct;
970 int cxt = current_function_needs_context;
973 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
974 ASM_OUTPUT_INTERNAL_LABEL (file, "LP", profile_label_no);
975 assemble_integer (const0_rtx, UNITS_PER_WORD, 1);
979 #ifdef STRUCT_VALUE_INCOMING_REGNUM
981 ASM_OUTPUT_REG_PUSH (file, STRUCT_VALUE_INCOMING_REGNUM);
983 #ifdef STRUCT_VALUE_REGNUM
985 ASM_OUTPUT_REG_PUSH (file, STRUCT_VALUE_REGNUM);
990 #ifdef STATIC_CHAIN_INCOMING_REGNUM
992 ASM_OUTPUT_REG_PUSH (file, STATIC_CHAIN_INCOMING_REGNUM);
994 #ifdef STATIC_CHAIN_REGNUM
996 ASM_OUTPUT_REG_PUSH (file, STATIC_CHAIN_REGNUM);
1001 FUNCTION_PROFILER (file, profile_label_no);
1004 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1006 ASM_OUTPUT_REG_POP (file, STATIC_CHAIN_INCOMING_REGNUM);
1008 #ifdef STATIC_CHAIN_REGNUM
1010 ASM_OUTPUT_REG_POP (file, STATIC_CHAIN_REGNUM);
1015 #ifdef STRUCT_VALUE_INCOMING_REGNUM
1017 ASM_OUTPUT_REG_POP (file, STRUCT_VALUE_INCOMING_REGNUM);
1019 #ifdef STRUCT_VALUE_REGNUM
1021 ASM_OUTPUT_REG_POP (file, STRUCT_VALUE_REGNUM);
1026 /* Output assembler code for the end of a function.
1027 For clarity, args are same as those of `final_start_function'
1028 even though not all of them are needed. */
1031 final_end_function (first, file, optimize)
1038 fprintf (file, ASM_APP_OFF);
1042 #ifdef SDB_DEBUGGING_INFO
1043 if (write_symbols == SDB_DEBUG)
1044 sdbout_end_function (last_linenum);
1047 #ifdef DWARF_DEBUGGING_INFO
1048 if (write_symbols == DWARF_DEBUG)
1049 dwarfout_end_function ();
1052 #ifdef XCOFF_DEBUGGING_INFO
1053 if (write_symbols == XCOFF_DEBUG)
1054 xcoffout_end_function (file, last_linenum);
1057 #ifdef FUNCTION_EPILOGUE
1058 /* Finally, output the function epilogue:
1059 code to restore the stack frame and return to the caller. */
1060 FUNCTION_EPILOGUE (file, get_frame_size ());
1063 #ifdef SDB_DEBUGGING_INFO
1064 if (write_symbols == SDB_DEBUG)
1065 sdbout_end_epilogue ();
1068 #ifdef DWARF_DEBUGGING_INFO
1069 if (write_symbols == DWARF_DEBUG)
1070 dwarfout_end_epilogue ();
1073 #ifdef XCOFF_DEBUGGING_INFO
1074 if (write_symbols == XCOFF_DEBUG)
1075 xcoffout_end_epilogue (file);
1078 bb_func_label_num = -1; /* not in function, nuke label # */
1080 /* If FUNCTION_EPILOGUE is not defined, then the function body
1081 itself contains return instructions wherever needed. */
1084 /* Add a block to the linked list that remembers the current line/file/function
1085 for basic block profiling. Emit the label in front of the basic block and
1086 the instructions that increment the count field. */
1092 struct bb_list *ptr = (struct bb_list *) permalloc (sizeof (struct bb_list));
1094 /* Add basic block to linked list. */
1096 ptr->line_num = last_linenum;
1097 ptr->file_label_num = bb_file_label_num;
1098 ptr->func_label_num = bb_func_label_num;
1100 bb_tail = &ptr->next;
1102 /* Enable the table of basic-block use counts
1103 to point at the code it applies to. */
1104 ASM_OUTPUT_INTERNAL_LABEL (file, "LPB", count_basic_blocks);
1106 /* Before first insn of this basic block, increment the
1107 count of times it was entered. */
1108 #ifdef BLOCK_PROFILER
1109 BLOCK_PROFILER (file, count_basic_blocks);
1114 count_basic_blocks++;
1117 /* Add a string to be used for basic block profiling. */
1120 add_bb_string (string, perm_p)
1125 struct bb_str *ptr = 0;
1129 string = "<unknown>";
1133 /* Allocate a new string if the current string isn't permanent. If
1134 the string is permanent search for the same string in other
1137 len = strlen (string) + 1;
1140 char *p = (char *) permalloc (len);
1141 bcopy (string, p, len);
1145 for (ptr = sbb_head; ptr != (struct bb_str *)0; ptr = ptr->next)
1146 if (ptr->string == string)
1149 /* Allocate a new string block if we need to. */
1152 ptr = (struct bb_str *) permalloc (sizeof (*ptr));
1155 ptr->label_num = sbb_label_num++;
1156 ptr->string = string;
1158 sbb_tail = &ptr->next;
1161 return ptr->label_num;
1165 /* Output assembler code for some insns: all or part of a function.
1166 For description of args, see `final_start_function', above.
1168 PRESCAN is 1 if we are not really outputting,
1169 just scanning as if we were outputting.
1170 Prescanning deletes and rearranges insns just like ordinary output.
1171 PRESCAN is -2 if we are outputting after having prescanned.
1172 In this case, don't try to delete or rearrange insns
1173 because that has already been done.
1174 Prescanning is done only on certain machines. */
1177 final (first, file, optimize, prescan)
1186 last_ignored_compare = 0;
1189 /* Make a map indicating which line numbers appear in this function.
1190 When producing SDB debugging info, delete troublesome line number
1191 notes from inlined functions in other files as well as duplicate
1192 line number notes. */
1193 #ifdef SDB_DEBUGGING_INFO
1194 if (write_symbols == SDB_DEBUG)
1197 for (insn = first; insn; insn = NEXT_INSN (insn))
1198 if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
1200 if ((RTX_INTEGRATED_P (insn)
1201 && strcmp (NOTE_SOURCE_FILE (insn), main_input_filename) != 0)
1203 && NOTE_LINE_NUMBER (insn) == NOTE_LINE_NUMBER (last)
1204 && NOTE_SOURCE_FILE (insn) == NOTE_SOURCE_FILE (last)))
1206 NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
1207 NOTE_SOURCE_FILE (insn) = 0;
1211 if (NOTE_LINE_NUMBER (insn) > max_line)
1212 max_line = NOTE_LINE_NUMBER (insn);
1218 for (insn = first; insn; insn = NEXT_INSN (insn))
1219 if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > max_line)
1220 max_line = NOTE_LINE_NUMBER (insn);
1223 line_note_exists = (char *) oballoc (max_line + 1);
1224 bzero (line_note_exists, max_line + 1);
1226 for (insn = first; insn; insn = NEXT_INSN (insn))
1227 if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
1228 line_note_exists[NOTE_LINE_NUMBER (insn)] = 1;
1234 /* Output the insns. */
1235 for (insn = NEXT_INSN (first); insn;)
1236 insn = final_scan_insn (insn, file, optimize, prescan, 0);
1238 /* Do basic-block profiling here
1239 if the last insn was a conditional branch. */
1240 if (profile_block_flag && new_block)
1244 /* The final scan for one insn, INSN.
1245 Args are same as in `final', except that INSN
1246 is the insn being scanned.
1247 Value returned is the next insn to be scanned.
1249 NOPEEPHOLES is the flag to disallow peephole processing (currently
1250 used for within delayed branch sequence output). */
1253 final_scan_insn (insn, file, optimize, prescan, nopeepholes)
1263 /* Ignore deleted insns. These can occur when we split insns (due to a
1264 template of "#") while not optimizing. */
1265 if (INSN_DELETED_P (insn))
1266 return NEXT_INSN (insn);
1268 switch (GET_CODE (insn))
1274 /* Align the beginning of a loop, for higher speed
1275 on certain machines. */
1277 if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_BEG && optimize > 0)
1279 #ifdef ASM_OUTPUT_LOOP_ALIGN
1280 rtx next = next_nonnote_insn (insn);
1281 if (next && GET_CODE (next) == CODE_LABEL)
1283 ASM_OUTPUT_LOOP_ALIGN (asm_out_file);
1288 if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_END)
1291 if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END)
1293 #ifdef FUNCTION_END_PROLOGUE
1294 FUNCTION_END_PROLOGUE (file);
1296 profile_after_prologue (file);
1300 #ifdef FUNCTION_BEGIN_EPILOGUE
1301 if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EPILOGUE_BEG)
1303 FUNCTION_BEGIN_EPILOGUE (file);
1308 if (write_symbols == NO_DEBUG)
1310 if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_FUNCTION_BEG)
1312 #ifdef SDB_DEBUGGING_INFO
1313 if (write_symbols == SDB_DEBUG)
1314 sdbout_begin_function (last_linenum);
1316 #ifdef XCOFF_DEBUGGING_INFO
1317 if (write_symbols == XCOFF_DEBUG)
1318 xcoffout_begin_function (file, last_linenum);
1320 #ifdef DWARF_DEBUGGING_INFO
1321 if (write_symbols == DWARF_DEBUG)
1322 dwarfout_begin_function ();
1326 if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_DELETED)
1327 break; /* An insn that was "deleted" */
1330 fprintf (file, ASM_APP_OFF);
1333 if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG
1334 && (debug_info_level == DINFO_LEVEL_NORMAL
1335 || debug_info_level == DINFO_LEVEL_VERBOSE
1336 #ifdef DWARF_DEBUGGING_INFO
1337 || write_symbols == DWARF_DEBUG
1342 /* Beginning of a symbol-block. Assign it a sequence number
1343 and push the number onto the stack PENDING_BLOCKS. */
1345 if (block_depth == max_block_depth)
1347 /* PENDING_BLOCKS is full; make it longer. */
1348 max_block_depth *= 2;
1350 = (int *) xrealloc (pending_blocks,
1351 max_block_depth * sizeof (int));
1353 pending_blocks[block_depth++] = next_block_index;
1355 /* Output debugging info about the symbol-block beginning. */
1357 #ifdef SDB_DEBUGGING_INFO
1358 if (write_symbols == SDB_DEBUG)
1359 sdbout_begin_block (file, last_linenum, next_block_index);
1361 #ifdef XCOFF_DEBUGGING_INFO
1362 if (write_symbols == XCOFF_DEBUG)
1363 xcoffout_begin_block (file, last_linenum, next_block_index);
1365 #ifdef DBX_DEBUGGING_INFO
1366 if (write_symbols == DBX_DEBUG)
1367 ASM_OUTPUT_INTERNAL_LABEL (file, "LBB", next_block_index);
1369 #ifdef DWARF_DEBUGGING_INFO
1370 if (write_symbols == DWARF_DEBUG && block_depth > 1)
1371 dwarfout_begin_block (next_block_index);
1376 else if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END
1377 && (debug_info_level == DINFO_LEVEL_NORMAL
1378 || debug_info_level == DINFO_LEVEL_VERBOSE
1379 #ifdef DWARF_DEBUGGING_INFO
1380 || write_symbols == DWARF_DEBUG
1385 /* End of a symbol-block. Pop its sequence number off
1386 PENDING_BLOCKS and output debugging info based on that. */
1390 #ifdef XCOFF_DEBUGGING_INFO
1391 if (write_symbols == XCOFF_DEBUG && block_depth >= 0)
1392 xcoffout_end_block (file, last_linenum, pending_blocks[block_depth]);
1394 #ifdef DBX_DEBUGGING_INFO
1395 if (write_symbols == DBX_DEBUG && block_depth >= 0)
1396 ASM_OUTPUT_INTERNAL_LABEL (file, "LBE",
1397 pending_blocks[block_depth]);
1399 #ifdef SDB_DEBUGGING_INFO
1400 if (write_symbols == SDB_DEBUG && block_depth >= 0)
1401 sdbout_end_block (file, last_linenum);
1403 #ifdef DWARF_DEBUGGING_INFO
1404 if (write_symbols == DWARF_DEBUG && block_depth >= 1)
1405 dwarfout_end_block (pending_blocks[block_depth]);
1408 else if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_DELETED_LABEL
1409 && (debug_info_level == DINFO_LEVEL_NORMAL
1410 || debug_info_level == DINFO_LEVEL_VERBOSE))
1412 #ifdef DWARF_DEBUGGING_INFO
1413 if (write_symbols == DWARF_DEBUG)
1414 dwarfout_label (insn);
1417 else if (NOTE_LINE_NUMBER (insn) > 0)
1418 /* This note is a line-number. */
1422 #if 0 /* This is what we used to do. */
1423 output_source_line (file, insn);
1427 /* If there is anything real after this note,
1428 output it. If another line note follows, omit this one. */
1429 for (note = NEXT_INSN (insn); note; note = NEXT_INSN (note))
1431 if (GET_CODE (note) != NOTE && GET_CODE (note) != CODE_LABEL)
1433 /* These types of notes can be significant
1434 so make sure the preceding line number stays. */
1435 else if (GET_CODE (note) == NOTE
1436 && (NOTE_LINE_NUMBER (note) == NOTE_INSN_BLOCK_BEG
1437 || NOTE_LINE_NUMBER (note) == NOTE_INSN_BLOCK_END
1438 || NOTE_LINE_NUMBER (note) == NOTE_INSN_FUNCTION_BEG))
1440 else if (GET_CODE (note) == NOTE && NOTE_LINE_NUMBER (note) > 0)
1442 /* Another line note follows; we can delete this note
1443 if no intervening line numbers have notes elsewhere. */
1445 for (num = NOTE_LINE_NUMBER (insn) + 1;
1446 num < NOTE_LINE_NUMBER (note);
1448 if (line_note_exists[num])
1451 if (num >= NOTE_LINE_NUMBER (note))
1457 /* Output this line note
1458 if it is the first or the last line note in a row. */
1460 output_source_line (file, insn);
1465 #ifdef ASM_OUTPUT_ALIGN_CODE
1466 /* Don't litter the assembler output with needless alignments. A
1467 BARRIER will be placed at the end of every function if HAVE_epilogue
1469 if (NEXT_INSN (insn))
1470 ASM_OUTPUT_ALIGN_CODE (file);
1479 #ifdef SDB_DEBUGGING_INFO
1480 if (write_symbols == SDB_DEBUG && LABEL_NAME (insn))
1481 sdbout_label (insn);
1483 #ifdef DWARF_DEBUGGING_INFO
1484 if (write_symbols == DWARF_DEBUG && LABEL_NAME (insn))
1485 dwarfout_label (insn);
1489 fprintf (file, ASM_APP_OFF);
1492 if (NEXT_INSN (insn) != 0
1493 && GET_CODE (NEXT_INSN (insn)) == JUMP_INSN)
1495 rtx nextbody = PATTERN (NEXT_INSN (insn));
1497 /* If this label is followed by a jump-table,
1498 make sure we put the label in the read-only section. Also
1499 possibly write the label and jump table together. */
1501 if (GET_CODE (nextbody) == ADDR_VEC
1502 || GET_CODE (nextbody) == ADDR_DIFF_VEC)
1504 #ifndef JUMP_TABLES_IN_TEXT_SECTION
1505 readonly_data_section ();
1506 #ifdef READONLY_DATA_SECTION
1507 ASM_OUTPUT_ALIGN (file,
1508 exact_log2 (BIGGEST_ALIGNMENT
1510 #endif /* READONLY_DATA_SECTION */
1511 #else /* JUMP_TABLES_IN_TEXT_SECTION */
1513 #endif /* JUMP_TABLES_IN_TEXT_SECTION */
1514 #ifdef ASM_OUTPUT_CASE_LABEL
1515 ASM_OUTPUT_CASE_LABEL (file, "L", CODE_LABEL_NUMBER (insn),
1518 ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
1524 ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
1529 register rtx body = PATTERN (insn);
1530 int insn_code_number;
1534 /* An INSN, JUMP_INSN or CALL_INSN.
1535 First check for special kinds that recog doesn't recognize. */
1537 if (GET_CODE (body) == USE /* These are just declarations */
1538 || GET_CODE (body) == CLOBBER)
1542 /* If there is a REG_CC_SETTER note on this insn, it means that
1543 the setting of the condition code was done in the delay slot
1544 of the insn that branched here. So recover the cc status
1545 from the insn that set it. */
1547 note = find_reg_note (insn, REG_CC_SETTER, NULL_RTX);
1550 NOTICE_UPDATE_CC (PATTERN (XEXP (note, 0)), XEXP (note, 0));
1551 cc_prev_status = cc_status;
1555 /* Detect insns that are really jump-tables
1556 and output them as such. */
1558 if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
1560 register int vlen, idx;
1567 fprintf (file, ASM_APP_OFF);
1571 vlen = XVECLEN (body, GET_CODE (body) == ADDR_DIFF_VEC);
1572 for (idx = 0; idx < vlen; idx++)
1574 if (GET_CODE (body) == ADDR_VEC)
1576 #ifdef ASM_OUTPUT_ADDR_VEC_ELT
1577 ASM_OUTPUT_ADDR_VEC_ELT
1578 (file, CODE_LABEL_NUMBER (XEXP (XVECEXP (body, 0, idx), 0)));
1585 #ifdef ASM_OUTPUT_ADDR_DIFF_ELT
1586 ASM_OUTPUT_ADDR_DIFF_ELT
1588 CODE_LABEL_NUMBER (XEXP (XVECEXP (body, 1, idx), 0)),
1589 CODE_LABEL_NUMBER (XEXP (XEXP (body, 0), 0)));
1595 #ifdef ASM_OUTPUT_CASE_END
1596 ASM_OUTPUT_CASE_END (file,
1597 CODE_LABEL_NUMBER (PREV_INSN (insn)),
1606 /* Do basic-block profiling when we reach a new block.
1607 Done here to avoid jump tables. */
1608 if (profile_block_flag && new_block)
1611 if (GET_CODE (body) == ASM_INPUT)
1613 /* There's no telling what that did to the condition codes. */
1619 fprintf (file, ASM_APP_ON);
1622 fprintf (asm_out_file, "\t%s\n", XSTR (body, 0));
1626 /* Detect `asm' construct with operands. */
1627 if (asm_noperands (body) >= 0)
1629 int noperands = asm_noperands (body);
1630 rtx *ops = (rtx *) alloca (noperands * sizeof (rtx));
1633 /* There's no telling what that did to the condition codes. */
1640 fprintf (file, ASM_APP_ON);
1644 /* Get out the operand values. */
1645 string = decode_asm_operands (body, ops, NULL_PTR,
1646 NULL_PTR, NULL_PTR);
1647 /* Inhibit aborts on what would otherwise be compiler bugs. */
1648 insn_noperands = noperands;
1649 this_is_asm_operands = insn;
1651 /* Output the insn using them. */
1652 output_asm_insn (string, ops);
1653 this_is_asm_operands = 0;
1657 if (prescan <= 0 && app_on)
1659 fprintf (file, ASM_APP_OFF);
1663 if (GET_CODE (body) == SEQUENCE)
1665 /* A delayed-branch sequence */
1671 final_sequence = body;
1673 /* The first insn in this SEQUENCE might be a JUMP_INSN that will
1674 force the restoration of a comparison that was previously
1675 thought unnecessary. If that happens, cancel this sequence
1676 and cause that insn to be restored. */
1678 next = final_scan_insn (XVECEXP (body, 0, 0), file, 0, prescan, 1);
1679 if (next != XVECEXP (body, 0, 1))
1685 for (i = 1; i < XVECLEN (body, 0); i++)
1686 final_scan_insn (XVECEXP (body, 0, i), file, 0, prescan, 1);
1687 #ifdef DBR_OUTPUT_SEQEND
1688 DBR_OUTPUT_SEQEND (file);
1692 /* If the insn requiring the delay slot was a CALL_INSN, the
1693 insns in the delay slot are actually executed before the
1694 called function. Hence we don't preserve any CC-setting
1695 actions in these insns and the CC must be marked as being
1696 clobbered by the function. */
1697 if (GET_CODE (XVECEXP (body, 0, 0)) == CALL_INSN)
1700 /* Following a conditional branch sequence, we have a new basic
1702 if (profile_block_flag)
1704 rtx insn = XVECEXP (body, 0, 0);
1705 rtx body = PATTERN (insn);
1707 if ((GET_CODE (insn) == JUMP_INSN && GET_CODE (body) == SET
1708 && GET_CODE (SET_SRC (body)) != LABEL_REF)
1709 || (GET_CODE (insn) == JUMP_INSN
1710 && GET_CODE (body) == PARALLEL
1711 && GET_CODE (XVECEXP (body, 0, 0)) == SET
1712 && GET_CODE (SET_SRC (XVECEXP (body, 0, 0))) != LABEL_REF))
1718 /* We have a real machine instruction as rtl. */
1720 body = PATTERN (insn);
1723 /* Check for redundant test and compare instructions
1724 (when the condition codes are already set up as desired).
1725 This is done only when optimizing; if not optimizing,
1726 it should be possible for the user to alter a variable
1727 with the debugger in between statements
1728 and the next statement should reexamine the variable
1729 to compute the condition codes. */
1732 && GET_CODE (body) == SET
1733 && GET_CODE (SET_DEST (body)) == CC0
1734 && insn != last_ignored_compare)
1736 if (GET_CODE (SET_SRC (body)) == SUBREG)
1737 SET_SRC (body) = alter_subreg (SET_SRC (body));
1738 else if (GET_CODE (SET_SRC (body)) == COMPARE)
1740 if (GET_CODE (XEXP (SET_SRC (body), 0)) == SUBREG)
1741 XEXP (SET_SRC (body), 0)
1742 = alter_subreg (XEXP (SET_SRC (body), 0));
1743 if (GET_CODE (XEXP (SET_SRC (body), 1)) == SUBREG)
1744 XEXP (SET_SRC (body), 1)
1745 = alter_subreg (XEXP (SET_SRC (body), 1));
1747 if ((cc_status.value1 != 0
1748 && rtx_equal_p (SET_SRC (body), cc_status.value1))
1749 || (cc_status.value2 != 0
1750 && rtx_equal_p (SET_SRC (body), cc_status.value2)))
1752 /* Don't delete insn if it has an addressing side-effect. */
1753 if (! FIND_REG_INC_NOTE (insn, 0)
1754 /* or if anything in it is volatile. */
1755 && ! volatile_refs_p (PATTERN (insn)))
1757 /* We don't really delete the insn; just ignore it. */
1758 last_ignored_compare = insn;
1765 /* Following a conditional branch, we have a new basic block.
1766 But if we are inside a sequence, the new block starts after the
1767 last insn of the sequence. */
1768 if (profile_block_flag && final_sequence == 0
1769 && ((GET_CODE (insn) == JUMP_INSN && GET_CODE (body) == SET
1770 && GET_CODE (SET_SRC (body)) != LABEL_REF)
1771 || (GET_CODE (insn) == JUMP_INSN && GET_CODE (body) == PARALLEL
1772 && GET_CODE (XVECEXP (body, 0, 0)) == SET
1773 && GET_CODE (SET_SRC (XVECEXP (body, 0, 0))) != LABEL_REF)))
1777 /* Don't bother outputting obvious no-ops, even without -O.
1778 This optimization is fast and doesn't interfere with debugging.
1779 Don't do this if the insn is in a delay slot, since this
1780 will cause an improper number of delay insns to be written. */
1781 if (final_sequence == 0
1783 && GET_CODE (insn) == INSN && GET_CODE (body) == SET
1784 && GET_CODE (SET_SRC (body)) == REG
1785 && GET_CODE (SET_DEST (body)) == REG
1786 && REGNO (SET_SRC (body)) == REGNO (SET_DEST (body)))
1791 /* If this is a conditional branch, maybe modify it
1792 if the cc's are in a nonstandard state
1793 so that it accomplishes the same thing that it would
1794 do straightforwardly if the cc's were set up normally. */
1796 if (cc_status.flags != 0
1797 && GET_CODE (insn) == JUMP_INSN
1798 && GET_CODE (body) == SET
1799 && SET_DEST (body) == pc_rtx
1800 && GET_CODE (SET_SRC (body)) == IF_THEN_ELSE
1801 /* This is done during prescan; it is not done again
1802 in final scan when prescan has been done. */
1805 /* This function may alter the contents of its argument
1806 and clear some of the cc_status.flags bits.
1807 It may also return 1 meaning condition now always true
1808 or -1 meaning condition now always false
1809 or 2 meaning condition nontrivial but altered. */
1810 register int result = alter_cond (XEXP (SET_SRC (body), 0));
1811 /* If condition now has fixed value, replace the IF_THEN_ELSE
1812 with its then-operand or its else-operand. */
1814 SET_SRC (body) = XEXP (SET_SRC (body), 1);
1816 SET_SRC (body) = XEXP (SET_SRC (body), 2);
1818 /* The jump is now either unconditional or a no-op.
1819 If it has become a no-op, don't try to output it.
1820 (It would not be recognized.) */
1821 if (SET_SRC (body) == pc_rtx)
1823 PUT_CODE (insn, NOTE);
1824 NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
1825 NOTE_SOURCE_FILE (insn) = 0;
1828 else if (GET_CODE (SET_SRC (body)) == RETURN)
1829 /* Replace (set (pc) (return)) with (return). */
1830 PATTERN (insn) = body = SET_SRC (body);
1832 /* Rerecognize the instruction if it has changed. */
1834 INSN_CODE (insn) = -1;
1837 /* Make same adjustments to instructions that examine the
1838 condition codes without jumping (if this machine has them). */
1840 if (cc_status.flags != 0
1841 && GET_CODE (body) == SET)
1843 switch (GET_CODE (SET_SRC (body)))
1856 register int result;
1857 if (XEXP (SET_SRC (body), 0) != cc0_rtx)
1859 result = alter_cond (SET_SRC (body));
1861 validate_change (insn, &SET_SRC (body), const_true_rtx, 0);
1862 else if (result == -1)
1863 validate_change (insn, &SET_SRC (body), const0_rtx, 0);
1864 else if (result == 2)
1865 INSN_CODE (insn) = -1;
1871 /* Do machine-specific peephole optimizations if desired. */
1873 if (optimize && !flag_no_peephole && !nopeepholes)
1875 rtx next = peephole (insn);
1876 /* When peepholing, if there were notes within the peephole,
1877 emit them before the peephole. */
1878 if (next != 0 && next != NEXT_INSN (insn))
1880 rtx prev = PREV_INSN (insn);
1883 for (note = NEXT_INSN (insn); note != next;
1884 note = NEXT_INSN (note))
1885 final_scan_insn (note, file, optimize, prescan, nopeepholes);
1887 /* In case this is prescan, put the notes
1888 in proper position for later rescan. */
1889 note = NEXT_INSN (insn);
1890 PREV_INSN (note) = prev;
1891 NEXT_INSN (prev) = note;
1892 NEXT_INSN (PREV_INSN (next)) = insn;
1893 PREV_INSN (insn) = PREV_INSN (next);
1894 NEXT_INSN (insn) = next;
1895 PREV_INSN (next) = insn;
1898 /* PEEPHOLE might have changed this. */
1899 body = PATTERN (insn);
1902 /* Try to recognize the instruction.
1903 If successful, verify that the operands satisfy the
1904 constraints for the instruction. Crash if they don't,
1905 since `reload' should have changed them so that they do. */
1907 insn_code_number = recog_memoized (insn);
1908 insn_extract (insn);
1909 for (i = 0; i < insn_n_operands[insn_code_number]; i++)
1911 if (GET_CODE (recog_operand[i]) == SUBREG)
1912 recog_operand[i] = alter_subreg (recog_operand[i]);
1913 else if (GET_CODE (recog_operand[i]) == PLUS
1914 || GET_CODE (recog_operand[i]) == MULT)
1915 recog_operand[i] = walk_alter_subreg (recog_operand[i]);
1918 for (i = 0; i < insn_n_dups[insn_code_number]; i++)
1920 if (GET_CODE (*recog_dup_loc[i]) == SUBREG)
1921 *recog_dup_loc[i] = alter_subreg (*recog_dup_loc[i]);
1922 else if (GET_CODE (*recog_dup_loc[i]) == PLUS
1923 || GET_CODE (*recog_dup_loc[i]) == MULT)
1924 *recog_dup_loc[i] = walk_alter_subreg (*recog_dup_loc[i]);
1927 #ifdef REGISTER_CONSTRAINTS
1928 if (! constrain_operands (insn_code_number, 1))
1929 fatal_insn_not_found (insn);
1932 /* Some target machines need to prescan each insn before
1935 #ifdef FINAL_PRESCAN_INSN
1936 FINAL_PRESCAN_INSN (insn, recog_operand,
1937 insn_n_operands[insn_code_number]);
1941 cc_prev_status = cc_status;
1943 /* Update `cc_status' for this instruction.
1944 The instruction's output routine may change it further.
1945 If the output routine for a jump insn needs to depend
1946 on the cc status, it should look at cc_prev_status. */
1948 NOTICE_UPDATE_CC (body, insn);
1953 /* If the proper template needs to be chosen by some C code,
1954 run that code and get the real template. */
1956 template = insn_template[insn_code_number];
1959 template = (*insn_outfun[insn_code_number]) (recog_operand, insn);
1961 /* If the C code returns 0, it means that it is a jump insn
1962 which follows a deleted test insn, and that test insn
1963 needs to be reinserted. */
1966 if (prev_nonnote_insn (insn) != last_ignored_compare)
1969 return prev_nonnote_insn (insn);
1973 /* If the template is the string "#", it means that this insn must
1975 if (template[0] == '#' && template[1] == '\0')
1977 rtx new = try_split (body, insn, 0);
1979 /* If we didn't split the insn, go away. */
1980 if (new == insn && PATTERN (new) == body)
1990 /* Output assembler code from the template. */
1992 output_asm_insn (template, recog_operand);
1995 /* It's not at all clear why we did this and doing so interferes
1996 with tests we'd like to do to use REG_WAS_0 notes, so let's try
1999 /* Mark this insn as having been output. */
2000 INSN_DELETED_P (insn) = 1;
2006 return NEXT_INSN (insn);
2009 /* Output debugging info to the assembler file FILE
2010 based on the NOTE-insn INSN, assumed to be a line number. */
2013 output_source_line (file, insn)
2017 char ltext_label_name[100];
2018 register char *filename = NOTE_SOURCE_FILE (insn);
2020 /* Remember filename for basic block profiling.
2021 Filenames are allocated on the permanent obstack
2022 or are passed in ARGV, so we don't have to save
2025 if (profile_block_flag && last_filename != filename)
2026 bb_file_label_num = add_bb_string (filename, TRUE);
2028 last_filename = filename;
2029 last_linenum = NOTE_LINE_NUMBER (insn);
2031 if (write_symbols != NO_DEBUG)
2033 #ifdef SDB_DEBUGGING_INFO
2034 if (write_symbols == SDB_DEBUG
2035 #if 0 /* People like having line numbers even in wrong file! */
2036 /* COFF can't handle multiple source files--lose, lose. */
2037 && !strcmp (filename, main_input_filename)
2039 /* COFF relative line numbers must be positive. */
2040 && last_linenum > sdb_begin_function_line)
2042 #ifdef ASM_OUTPUT_SOURCE_LINE
2043 ASM_OUTPUT_SOURCE_LINE (file, last_linenum);
2045 fprintf (file, "\t.ln\t%d\n",
2046 ((sdb_begin_function_line > -1)
2047 ? last_linenum - sdb_begin_function_line : 1));
2052 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2053 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2054 dbxout_source_line (file, filename, NOTE_LINE_NUMBER (insn));
2055 #endif /* DBX_DEBUGGING_INFO || XCOFF_DEBUGGING_INFO */
2057 #ifdef DWARF_DEBUGGING_INFO
2058 if (write_symbols == DWARF_DEBUG)
2059 dwarfout_line (filename, NOTE_LINE_NUMBER (insn));
2064 /* If X is a SUBREG, replace it with a REG or a MEM,
2065 based on the thing it is a subreg of. */
2071 register rtx y = SUBREG_REG (x);
2072 if (GET_CODE (y) == SUBREG)
2073 y = alter_subreg (y);
2075 if (GET_CODE (y) == REG)
2077 /* If the containing reg really gets a hard reg, so do we. */
2079 REGNO (x) = REGNO (y) + SUBREG_WORD (x);
2081 else if (GET_CODE (y) == MEM)
2083 register int offset = SUBREG_WORD (x) * UNITS_PER_WORD;
2084 #if BYTES_BIG_ENDIAN
2085 offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x)))
2086 - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (y))));
2089 MEM_VOLATILE_P (x) = MEM_VOLATILE_P (y);
2090 XEXP (x, 0) = plus_constant (XEXP (y, 0), offset);
2096 /* Do alter_subreg on all the SUBREGs contained in X. */
2099 walk_alter_subreg (x)
2102 switch (GET_CODE (x))
2106 XEXP (x, 0) = walk_alter_subreg (XEXP (x, 0));
2107 XEXP (x, 1) = walk_alter_subreg (XEXP (x, 1));
2111 XEXP (x, 0) = walk_alter_subreg (XEXP (x, 0));
2115 return alter_subreg (x);
2123 /* Given BODY, the body of a jump instruction, alter the jump condition
2124 as required by the bits that are set in cc_status.flags.
2125 Not all of the bits there can be handled at this level in all cases.
2127 The value is normally 0.
2128 1 means that the condition has become always true.
2129 -1 means that the condition has become always false.
2130 2 means that COND has been altered. */
2138 if (cc_status.flags & CC_REVERSED)
2141 PUT_CODE (cond, swap_condition (GET_CODE (cond)));
2144 if (cc_status.flags & CC_INVERTED)
2147 PUT_CODE (cond, reverse_condition (GET_CODE (cond)));
2150 if (cc_status.flags & CC_NOT_POSITIVE)
2151 switch (GET_CODE (cond))
2156 /* Jump becomes unconditional. */
2162 /* Jump becomes no-op. */
2166 PUT_CODE (cond, EQ);
2171 PUT_CODE (cond, NE);
2176 if (cc_status.flags & CC_NOT_NEGATIVE)
2177 switch (GET_CODE (cond))
2181 /* Jump becomes unconditional. */
2186 /* Jump becomes no-op. */
2191 PUT_CODE (cond, EQ);
2197 PUT_CODE (cond, NE);
2202 if (cc_status.flags & CC_NO_OVERFLOW)
2203 switch (GET_CODE (cond))
2206 /* Jump becomes unconditional. */
2210 PUT_CODE (cond, EQ);
2215 PUT_CODE (cond, NE);
2220 /* Jump becomes no-op. */
2224 if (cc_status.flags & (CC_Z_IN_NOT_N | CC_Z_IN_N))
2225 switch (GET_CODE (cond))
2238 PUT_CODE (cond, cc_status.flags & CC_Z_IN_N ? GE : LT);
2243 PUT_CODE (cond, cc_status.flags & CC_Z_IN_N ? LT : GE);
2248 if (cc_status.flags & CC_NOT_SIGNED)
2249 /* The flags are valid if signed condition operators are converted
2251 switch (GET_CODE (cond))
2254 PUT_CODE (cond, LEU);
2259 PUT_CODE (cond, LTU);
2264 PUT_CODE (cond, GTU);
2269 PUT_CODE (cond, GEU);
2278 /* Report inconsistency between the assembler template and the operands.
2279 In an `asm', it's the user's fault; otherwise, the compiler's fault. */
2282 output_operand_lossage (str)
2285 if (this_is_asm_operands)
2286 error_for_asm (this_is_asm_operands, "invalid `asm': %s", str);
2291 /* Output of assembler code from a template, and its subroutines. */
2293 /* Output text from TEMPLATE to the assembler output file,
2294 obeying %-directions to substitute operands taken from
2295 the vector OPERANDS.
2297 %N (for N a digit) means print operand N in usual manner.
2298 %lN means require operand N to be a CODE_LABEL or LABEL_REF
2299 and print the label name with no punctuation.
2300 %cN means require operand N to be a constant
2301 and print the constant expression with no punctuation.
2302 %aN means expect operand N to be a memory address
2303 (not a memory reference!) and print a reference
2305 %nN means expect operand N to be a constant
2306 and print a constant expression for minus the value
2307 of the operand, with no other punctuation. */
2310 output_asm_insn (template, operands)
2317 /* An insn may return a null string template
2318 in a case where no assembler code is needed. */
2323 putc ('\t', asm_out_file);
2325 #ifdef ASM_OUTPUT_OPCODE
2326 ASM_OUTPUT_OPCODE (asm_out_file, p);
2332 #ifdef ASM_OUTPUT_OPCODE
2334 putc (c, asm_out_file);
2335 while ((c = *p) == '\t')
2337 putc (c, asm_out_file);
2340 ASM_OUTPUT_OPCODE (asm_out_file, p);
2344 #ifdef ASSEMBLER_DIALECT
2346 /* If we want the first dialect, do nothing. Otherwise, skip
2347 DIALECT_NUMBER of strings ending with '|'. */
2348 for (i = 0; i < dialect_number; i++)
2350 while (*p && *p++ != '|')
2359 /* Skip to close brace. */
2360 while (*p && *p++ != '}')
2369 /* %% outputs a single %. */
2373 putc (c, asm_out_file);
2375 /* %= outputs a number which is unique to each insn in the entire
2376 compilation. This is useful for making local labels that are
2377 referred to more than once in a given insn. */
2381 fprintf (asm_out_file, "%d", insn_counter);
2383 /* % followed by a letter and some digits
2384 outputs an operand in a special way depending on the letter.
2385 Letters `acln' are implemented directly.
2386 Other letters are passed to `output_operand' so that
2387 the PRINT_OPERAND macro can define them. */
2388 else if ((*p >= 'a' && *p <= 'z')
2389 || (*p >= 'A' && *p <= 'Z'))
2394 if (! (*p >= '0' && *p <= '9'))
2395 output_operand_lossage ("operand number missing after %-letter");
2396 else if (this_is_asm_operands && c >= (unsigned) insn_noperands)
2397 output_operand_lossage ("operand number out of range");
2398 else if (letter == 'l')
2399 output_asm_label (operands[c]);
2400 else if (letter == 'a')
2401 output_address (operands[c]);
2402 else if (letter == 'c')
2404 if (CONSTANT_ADDRESS_P (operands[c]))
2405 output_addr_const (asm_out_file, operands[c]);
2407 output_operand (operands[c], 'c');
2409 else if (letter == 'n')
2411 if (GET_CODE (operands[c]) == CONST_INT)
2412 fprintf (asm_out_file,
2413 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
2418 - INTVAL (operands[c]));
2421 putc ('-', asm_out_file);
2422 output_addr_const (asm_out_file, operands[c]);
2426 output_operand (operands[c], letter);
2428 while ((c = *p) >= '0' && c <= '9') p++;
2430 /* % followed by a digit outputs an operand the default way. */
2431 else if (*p >= '0' && *p <= '9')
2434 if (this_is_asm_operands && c >= (unsigned) insn_noperands)
2435 output_operand_lossage ("operand number out of range");
2437 output_operand (operands[c], 0);
2438 while ((c = *p) >= '0' && c <= '9') p++;
2440 /* % followed by punctuation: output something for that
2441 punctuation character alone, with no operand.
2442 The PRINT_OPERAND macro decides what is actually done. */
2443 #ifdef PRINT_OPERAND_PUNCT_VALID_P
2444 else if (PRINT_OPERAND_PUNCT_VALID_P (*p))
2445 output_operand (NULL_RTX, *p++);
2448 output_operand_lossage ("invalid %%-code");
2452 putc (c, asm_out_file);
2455 if (flag_print_asm_name)
2457 /* Annotate the assembly with a comment describing the pattern and
2458 alternative used. */
2461 register int num = INSN_CODE (debug_insn);
2462 fprintf (asm_out_file, " %s %d %s",
2463 ASM_COMMENT_START, INSN_UID (debug_insn), insn_name[num]);
2464 if (insn_n_alternatives[num] > 1)
2465 fprintf (asm_out_file, "/%d", which_alternative + 1);
2467 /* Clear this so only the first assembler insn
2468 of any rtl insn will get the special comment for -dp. */
2473 putc ('\n', asm_out_file);
2476 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
2479 output_asm_label (x)
2484 if (GET_CODE (x) == LABEL_REF)
2485 ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (XEXP (x, 0)));
2486 else if (GET_CODE (x) == CODE_LABEL)
2487 ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x));
2489 output_operand_lossage ("`%l' operand isn't a label");
2491 assemble_name (asm_out_file, buf);
2494 /* Print operand X using machine-dependent assembler syntax.
2495 The macro PRINT_OPERAND is defined just to control this function.
2496 CODE is a non-digit that preceded the operand-number in the % spec,
2497 such as 'z' if the spec was `%z3'. CODE is 0 if there was no char
2498 between the % and the digits.
2499 When CODE is a non-letter, X is 0.
2501 The meanings of the letters are machine-dependent and controlled
2502 by PRINT_OPERAND. */
2505 output_operand (x, code)
2509 if (x && GET_CODE (x) == SUBREG)
2510 x = alter_subreg (x);
2512 /* If X is a pseudo-register, abort now rather than writing trash to the
2515 if (x && GET_CODE (x) == REG && REGNO (x) >= FIRST_PSEUDO_REGISTER)
2518 PRINT_OPERAND (asm_out_file, x, code);
2521 /* Print a memory reference operand for address X
2522 using machine-dependent assembler syntax.
2523 The macro PRINT_OPERAND_ADDRESS exists just to control this function. */
2529 walk_alter_subreg (x);
2530 PRINT_OPERAND_ADDRESS (asm_out_file, x);
2533 /* Print an integer constant expression in assembler syntax.
2534 Addition and subtraction are the only arithmetic
2535 that may appear in these expressions. */
2538 output_addr_const (file, x)
2545 switch (GET_CODE (x))
2555 assemble_name (file, XSTR (x, 0));
2559 ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (XEXP (x, 0)));
2560 assemble_name (file, buf);
2564 ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x));
2565 assemble_name (file, buf);
2570 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
2579 /* This used to output parentheses around the expression,
2580 but that does not work on the 386 (either ATT or BSD assembler). */
2581 output_addr_const (file, XEXP (x, 0));
2585 if (GET_MODE (x) == VOIDmode)
2587 /* We can use %d if the number is one word and positive. */
2588 if (CONST_DOUBLE_HIGH (x))
2590 #if HOST_BITS_PER_WIDE_INT == 64
2591 #if HOST_BITS_PER_WIDE_INT != HOST_BITS_PER_INT
2597 #if HOST_BITS_PER_WIDE_INT != HOST_BITS_PER_INT
2603 CONST_DOUBLE_HIGH (x), CONST_DOUBLE_LOW (x));
2604 else if (CONST_DOUBLE_LOW (x) < 0)
2606 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
2611 CONST_DOUBLE_LOW (x));
2614 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
2619 CONST_DOUBLE_LOW (x));
2622 /* We can't handle floating point constants;
2623 PRINT_OPERAND must handle them. */
2624 output_operand_lossage ("floating constant misused");
2628 /* Some assemblers need integer constants to appear last (eg masm). */
2629 if (GET_CODE (XEXP (x, 0)) == CONST_INT)
2631 output_addr_const (file, XEXP (x, 1));
2632 if (INTVAL (XEXP (x, 0)) >= 0)
2633 fprintf (file, "+");
2634 output_addr_const (file, XEXP (x, 0));
2638 output_addr_const (file, XEXP (x, 0));
2639 if (INTVAL (XEXP (x, 1)) >= 0)
2640 fprintf (file, "+");
2641 output_addr_const (file, XEXP (x, 1));
2646 /* Avoid outputting things like x-x or x+5-x,
2647 since some assemblers can't handle that. */
2648 x = simplify_subtraction (x);
2649 if (GET_CODE (x) != MINUS)
2652 output_addr_const (file, XEXP (x, 0));
2653 fprintf (file, "-");
2654 if (GET_CODE (XEXP (x, 1)) == CONST_INT
2655 && INTVAL (XEXP (x, 1)) < 0)
2657 fprintf (file, ASM_OPEN_PAREN);
2658 output_addr_const (file, XEXP (x, 1));
2659 fprintf (file, ASM_CLOSE_PAREN);
2662 output_addr_const (file, XEXP (x, 1));
2667 output_addr_const (file, XEXP (x, 0));
2671 output_operand_lossage ("invalid expression as operand");
2675 /* A poor man's fprintf, with the added features of %I, %R, %L, and %U.
2676 %R prints the value of REGISTER_PREFIX.
2677 %L prints the value of LOCAL_LABEL_PREFIX.
2678 %U prints the value of USER_LABEL_PREFIX.
2679 %I prints the value of IMMEDIATE_PREFIX.
2680 %O runs ASM_OUTPUT_OPCODE to transform what follows in the string.
2681 Also supported are %d, %x, %s, %e, %f, %g and %%.
2683 We handle alternate assembler dialects here, just like output_asm_insn. */
2686 asm_fprintf VPROTO((FILE *file, char *p, ...))
2697 VA_START (argptr, p);
2700 file = va_arg (argptr, FILE*);
2701 p = va_arg (argptr, char*);
2709 #ifdef ASSEMBLER_DIALECT
2711 /* If we want the first dialect, do nothing. Otherwise, skip
2712 DIALECT_NUMBER of strings ending with '|'. */
2713 for (i = 0; i < dialect_number; i++)
2715 while (*p && *p++ != '|')
2724 /* Skip to close brace. */
2725 while (*p && *p++ != '}')
2736 while ((c >= '0' && c <= '9') || c == '.')
2744 fprintf (file, "%%");
2747 case 'd': case 'i': case 'u':
2748 case 'x': case 'p': case 'X':
2752 fprintf (file, buf, va_arg (argptr, int));
2756 /* This is a prefix to the 'd', 'i', 'u', 'x', 'p', and 'X' cases,
2757 but we do not check for those cases. It means that the value
2758 is a HOST_WIDE_INT, which may be either `int' or `long'. */
2760 #if HOST_BITS_PER_WIDE_INT != HOST_BITS_PER_INT
2766 fprintf (file, buf, va_arg (argptr, HOST_WIDE_INT));
2773 fprintf (file, buf, va_arg (argptr, long));
2781 fprintf (file, buf, va_arg (argptr, double));
2787 fprintf (file, buf, va_arg (argptr, char *));
2791 #ifdef ASM_OUTPUT_OPCODE
2792 ASM_OUTPUT_OPCODE (asm_out_file, p);
2797 #ifdef REGISTER_PREFIX
2798 fprintf (file, "%s", REGISTER_PREFIX);
2803 #ifdef IMMEDIATE_PREFIX
2804 fprintf (file, "%s", IMMEDIATE_PREFIX);
2809 #ifdef LOCAL_LABEL_PREFIX
2810 fprintf (file, "%s", LOCAL_LABEL_PREFIX);
2815 #ifdef USER_LABEL_PREFIX
2816 fprintf (file, "%s", USER_LABEL_PREFIX);
2830 /* Split up a CONST_DOUBLE or integer constant rtx
2831 into two rtx's for single words,
2832 storing in *FIRST the word that comes first in memory in the target
2833 and in *SECOND the other. */
2836 split_double (value, first, second)
2838 rtx *first, *second;
2840 if (GET_CODE (value) == CONST_INT)
2842 /* The rule for using CONST_INT for a wider mode
2843 is that we regard the value as signed.
2844 So sign-extend it. */
2845 rtx high = (INTVAL (value) < 0 ? constm1_rtx : const0_rtx);
2846 #if WORDS_BIG_ENDIAN
2854 else if (GET_CODE (value) != CONST_DOUBLE)
2856 #if WORDS_BIG_ENDIAN
2857 *first = const0_rtx;
2861 *second = const0_rtx;
2864 else if (GET_MODE (value) == VOIDmode
2865 /* This is the old way we did CONST_DOUBLE integers. */
2866 || GET_MODE_CLASS (GET_MODE (value)) == MODE_INT)
2868 /* In an integer, the words are defined as most and least significant.
2869 So order them by the target's convention. */
2870 #if WORDS_BIG_ENDIAN
2871 *first = GEN_INT (CONST_DOUBLE_HIGH (value));
2872 *second = GEN_INT (CONST_DOUBLE_LOW (value));
2874 *first = GEN_INT (CONST_DOUBLE_LOW (value));
2875 *second = GEN_INT (CONST_DOUBLE_HIGH (value));
2880 #ifdef REAL_ARITHMETIC
2881 REAL_VALUE_TYPE r; HOST_WIDE_INT l[2];
2882 REAL_VALUE_FROM_CONST_DOUBLE (r, value);
2883 REAL_VALUE_TO_TARGET_DOUBLE (r, l);
2884 *first = GEN_INT (l[0]);
2885 *second = GEN_INT (l[1]);
2887 if ((HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
2888 || HOST_BITS_PER_WIDE_INT != BITS_PER_WORD)
2889 && ! flag_pretend_float)
2892 #if defined (HOST_WORDS_BIG_ENDIAN) == WORDS_BIG_ENDIAN
2893 /* Host and target agree => no need to swap. */
2894 *first = GEN_INT (CONST_DOUBLE_LOW (value));
2895 *second = GEN_INT (CONST_DOUBLE_HIGH (value));
2897 *second = GEN_INT (CONST_DOUBLE_LOW (value));
2898 *first = GEN_INT (CONST_DOUBLE_HIGH (value));
2900 #endif /* no REAL_ARITHMETIC */
2904 /* Return nonzero if this function has no function calls. */
2911 if (profile_flag || profile_block_flag)
2914 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2916 if (GET_CODE (insn) == CALL_INSN)
2918 if (GET_CODE (insn) == INSN
2919 && GET_CODE (PATTERN (insn)) == SEQUENCE
2920 && GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == CALL_INSN)
2923 for (insn = current_function_epilogue_delay_list; insn; insn = XEXP (insn, 1))
2925 if (GET_CODE (XEXP (insn, 0)) == CALL_INSN)
2927 if (GET_CODE (XEXP (insn, 0)) == INSN
2928 && GET_CODE (PATTERN (XEXP (insn, 0))) == SEQUENCE
2929 && GET_CODE (XVECEXP (PATTERN (XEXP (insn, 0)), 0, 0)) == CALL_INSN)
2936 /* On some machines, a function with no call insns
2937 can run faster if it doesn't create its own register window.
2938 When output, the leaf function should use only the "output"
2939 registers. Ordinarily, the function would be compiled to use
2940 the "input" registers to find its arguments; it is a candidate
2941 for leaf treatment if it uses only the "input" registers.
2942 Leaf function treatment means renumbering so the function
2943 uses the "output" registers instead. */
2945 #ifdef LEAF_REGISTERS
2947 static char permitted_reg_in_leaf_functions[] = LEAF_REGISTERS;
2949 /* Return 1 if this function uses only the registers that can be
2950 safely renumbered. */
2953 only_leaf_regs_used ()
2957 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
2959 if ((regs_ever_live[i] || global_regs[i])
2960 && ! permitted_reg_in_leaf_functions[i])
2966 /* Scan all instructions and renumber all registers into those
2967 available in leaf functions. */
2970 leaf_renumber_regs (first)
2975 /* Renumber only the actual patterns.
2976 The reg-notes can contain frame pointer refs,
2977 and renumbering them could crash, and should not be needed. */
2978 for (insn = first; insn; insn = NEXT_INSN (insn))
2979 if (GET_RTX_CLASS (GET_CODE (insn)) == 'i')
2980 leaf_renumber_regs_insn (PATTERN (insn));
2981 for (insn = current_function_epilogue_delay_list; insn; insn = XEXP (insn, 1))
2982 if (GET_RTX_CLASS (GET_CODE (XEXP (insn, 0))) == 'i')
2983 leaf_renumber_regs_insn (PATTERN (XEXP (insn, 0)));
2986 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
2987 available in leaf functions. */
2990 leaf_renumber_regs_insn (in_rtx)
2991 register rtx in_rtx;
2994 register char *format_ptr;
2999 /* Renumber all input-registers into output-registers.
3000 renumbered_regs would be 1 for an output-register;
3003 if (GET_CODE (in_rtx) == REG)
3007 /* Don't renumber the same reg twice. */
3011 newreg = REGNO (in_rtx);
3012 /* Don't try to renumber pseudo regs. It is possible for a pseudo reg
3013 to reach here as part of a REG_NOTE. */
3014 if (newreg >= FIRST_PSEUDO_REGISTER)
3019 newreg = LEAF_REG_REMAP (newreg);
3022 regs_ever_live[REGNO (in_rtx)] = 0;
3023 regs_ever_live[newreg] = 1;
3024 REGNO (in_rtx) = newreg;
3028 if (GET_RTX_CLASS (GET_CODE (in_rtx)) == 'i')
3030 /* Inside a SEQUENCE, we find insns.
3031 Renumber just the patterns of these insns,
3032 just as we do for the top-level insns. */
3033 leaf_renumber_regs_insn (PATTERN (in_rtx));
3037 format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx));
3039 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
3040 switch (*format_ptr++)
3043 leaf_renumber_regs_insn (XEXP (in_rtx, i));
3047 if (NULL != XVEC (in_rtx, i))
3049 for (j = 0; j < XVECLEN (in_rtx, i); j++)
3050 leaf_renumber_regs_insn (XVECEXP (in_rtx, i, j));