1 /* Convert RTL to assembler code and output it, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* This is the final pass of the compiler.
23 It looks at the rtl code for a function and outputs assembler code.
25 Call `final_start_function' to output the assembler code for function entry,
26 `final' to output assembler code for some RTL code,
27 `final_end_function' to output assembler code for function exit.
28 If a function is compiled in several pieces, each piece is
29 output separately with `final'.
31 Some optimizations are also done at this level.
32 Move instructions that were made unnecessary by good register allocation
33 are detected and omitted from the output. (Though most of these
34 are removed by the last jump pass.)
36 Instructions to set the condition codes are omitted when it can be
37 seen that the condition codes already had the desired values.
39 In some cases it is sufficient if the inherited condition codes
40 have related values, but this may require the following insn
41 (the one that tests the condition codes) to be modified.
43 The code for the function prologue and epilogue are generated
44 directly in assembler by the target functions function_prologue and
45 function_epilogue. Those instructions never exist as rtl. */
49 #include "coretypes.h"
56 #include "insn-config.h"
57 #include "insn-attr.h"
59 #include "conditions.h"
62 #include "hard-reg-set.h"
69 #include "basic-block.h"
73 #include "cfglayout.h"
74 #include "tree-pass.h"
75 #include "tree-flow.h"
85 #ifdef XCOFF_DEBUGGING_INFO
86 #include "xcoffout.h" /* Needed for external data
87 declarations for e.g. AIX 4.x. */
90 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
91 #include "dwarf2out.h"
94 #ifdef DBX_DEBUGGING_INFO
98 #ifdef SDB_DEBUGGING_INFO
102 /* If we aren't using cc0, CC_STATUS_INIT shouldn't exist. So define a
103 null default for it to save conditionalization later. */
104 #ifndef CC_STATUS_INIT
105 #define CC_STATUS_INIT
108 /* How to start an assembler comment. */
109 #ifndef ASM_COMMENT_START
110 #define ASM_COMMENT_START ";#"
113 /* Is the given character a logical line separator for the assembler? */
114 #ifndef IS_ASM_LOGICAL_LINE_SEPARATOR
115 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) ((C) == ';')
118 #ifndef JUMP_TABLES_IN_TEXT_SECTION
119 #define JUMP_TABLES_IN_TEXT_SECTION 0
122 /* Bitflags used by final_scan_insn. */
125 #define SEEN_EMITTED 4
127 /* Last insn processed by final_scan_insn. */
128 static rtx debug_insn;
129 rtx current_output_insn;
131 /* Line number of last NOTE. */
132 static int last_linenum;
134 /* Last discriminator written to assembly. */
135 static int last_discriminator;
137 /* Discriminator of current block. */
138 static int discriminator;
140 /* Highest line number in current block. */
141 static int high_block_linenum;
143 /* Likewise for function. */
144 static int high_function_linenum;
146 /* Filename of last NOTE. */
147 static const char *last_filename;
149 /* Override filename and line number. */
150 static const char *override_filename;
151 static int override_linenum;
153 /* Whether to force emission of a line note before the next insn. */
154 static bool force_source_line = false;
156 extern const int length_unit_log; /* This is defined in insn-attrtab.c. */
158 /* Nonzero while outputting an `asm' with operands.
159 This means that inconsistencies are the user's fault, so don't die.
160 The precise value is the insn being output, to pass to error_for_asm. */
161 rtx this_is_asm_operands;
163 /* Number of operands of this insn, for an `asm' with operands. */
164 static unsigned int insn_noperands;
166 /* Compare optimization flag. */
168 static rtx last_ignored_compare = 0;
170 /* Assign a unique number to each insn that is output.
171 This can be used to generate unique local labels. */
173 static int insn_counter = 0;
176 /* This variable contains machine-dependent flags (defined in tm.h)
177 set and examined by output routines
178 that describe how to interpret the condition codes properly. */
182 /* During output of an insn, this contains a copy of cc_status
183 from before the insn. */
185 CC_STATUS cc_prev_status;
188 /* Number of unmatched NOTE_INSN_BLOCK_BEG notes we have seen. */
190 static int block_depth;
192 /* Nonzero if have enabled APP processing of our assembler output. */
196 /* If we are outputting an insn sequence, this contains the sequence rtx.
201 #ifdef ASSEMBLER_DIALECT
203 /* Number of the assembler dialect to use, starting at 0. */
204 static int dialect_number;
207 #ifdef HAVE_conditional_execution
208 /* Nonnull if the insn currently being emitted was a COND_EXEC pattern. */
209 rtx current_insn_predicate;
212 #ifdef HAVE_ATTR_length
213 static int asm_insn_count (rtx);
215 static void profile_function (FILE *);
216 static void profile_after_prologue (FILE *);
217 static bool notice_source_line (rtx, bool *);
218 static rtx walk_alter_subreg (rtx *, bool *);
219 static void output_asm_name (void);
220 static void output_alternate_entry_point (FILE *, rtx);
221 static tree get_mem_expr_from_op (rtx, int *);
222 static void output_asm_operand_names (rtx *, int *, int);
223 static void output_operand (rtx, int);
224 #ifdef LEAF_REGISTERS
225 static void leaf_renumber_regs (rtx);
228 static int alter_cond (rtx);
230 #ifndef ADDR_VEC_ALIGN
231 static int final_addr_vec_align (rtx);
233 #ifdef HAVE_ATTR_length
234 static int align_fuzz (rtx, rtx, int, unsigned);
237 /* Initialize data in final at the beginning of a compilation. */
240 init_final (const char *filename ATTRIBUTE_UNUSED)
245 #ifdef ASSEMBLER_DIALECT
246 dialect_number = ASSEMBLER_DIALECT;
250 /* Default target function prologue and epilogue assembler output.
252 If not overridden for epilogue code, then the function body itself
253 contains return instructions wherever needed. */
255 default_function_pro_epilogue (FILE *file ATTRIBUTE_UNUSED,
256 HOST_WIDE_INT size ATTRIBUTE_UNUSED)
260 /* Default target hook that outputs nothing to a stream. */
262 no_asm_to_stream (FILE *file ATTRIBUTE_UNUSED)
266 /* Enable APP processing of subsequent output.
267 Used before the output from an `asm' statement. */
274 fputs (ASM_APP_ON, asm_out_file);
279 /* Disable APP processing of subsequent output.
280 Called from varasm.c before most kinds of output. */
287 fputs (ASM_APP_OFF, asm_out_file);
292 /* Return the number of slots filled in the current
293 delayed branch sequence (we don't count the insn needing the
294 delay slot). Zero if not in a delayed branch sequence. */
298 dbr_sequence_length (void)
300 if (final_sequence != 0)
301 return XVECLEN (final_sequence, 0) - 1;
307 /* The next two pages contain routines used to compute the length of an insn
308 and to shorten branches. */
310 /* Arrays for insn lengths, and addresses. The latter is referenced by
311 `insn_current_length'. */
313 static int *insn_lengths;
315 VEC(int,heap) *insn_addresses_;
317 /* Max uid for which the above arrays are valid. */
318 static int insn_lengths_max_uid;
320 /* Address of insn being processed. Used by `insn_current_length'. */
321 int insn_current_address;
323 /* Address of insn being processed in previous iteration. */
324 int insn_last_address;
326 /* known invariant alignment of insn being processed. */
327 int insn_current_align;
329 /* After shorten_branches, for any insn, uid_align[INSN_UID (insn)]
330 gives the next following alignment insn that increases the known
331 alignment, or NULL_RTX if there is no such insn.
332 For any alignment obtained this way, we can again index uid_align with
333 its uid to obtain the next following align that in turn increases the
334 alignment, till we reach NULL_RTX; the sequence obtained this way
335 for each insn we'll call the alignment chain of this insn in the following
338 struct label_alignment
344 static rtx *uid_align;
345 static int *uid_shuid;
346 static struct label_alignment *label_align;
348 /* Indicate that branch shortening hasn't yet been done. */
351 init_insn_lengths (void)
362 insn_lengths_max_uid = 0;
364 #ifdef HAVE_ATTR_length
365 INSN_ADDRESSES_FREE ();
374 /* Obtain the current length of an insn. If branch shortening has been done,
375 get its actual length. Otherwise, use FALLBACK_FN to calculate the
378 get_attr_length_1 (rtx insn ATTRIBUTE_UNUSED,
379 int (*fallback_fn) (rtx) ATTRIBUTE_UNUSED)
381 #ifdef HAVE_ATTR_length
386 if (insn_lengths_max_uid > INSN_UID (insn))
387 return insn_lengths[INSN_UID (insn)];
389 switch (GET_CODE (insn))
398 length = fallback_fn (insn);
402 body = PATTERN (insn);
403 if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
405 /* Alignment is machine-dependent and should be handled by
409 length = fallback_fn (insn);
413 body = PATTERN (insn);
414 if (GET_CODE (body) == USE || GET_CODE (body) == CLOBBER)
417 else if (GET_CODE (body) == ASM_INPUT || asm_noperands (body) >= 0)
418 length = asm_insn_count (body) * fallback_fn (insn);
419 else if (GET_CODE (body) == SEQUENCE)
420 for (i = 0; i < XVECLEN (body, 0); i++)
421 length += get_attr_length_1 (XVECEXP (body, 0, i), fallback_fn);
423 length = fallback_fn (insn);
430 #ifdef ADJUST_INSN_LENGTH
431 ADJUST_INSN_LENGTH (insn, length);
434 #else /* not HAVE_ATTR_length */
436 #define insn_default_length 0
437 #define insn_min_length 0
438 #endif /* not HAVE_ATTR_length */
441 /* Obtain the current length of an insn. If branch shortening has been done,
442 get its actual length. Otherwise, get its maximum length. */
444 get_attr_length (rtx insn)
446 return get_attr_length_1 (insn, insn_default_length);
449 /* Obtain the current length of an insn. If branch shortening has been done,
450 get its actual length. Otherwise, get its minimum length. */
452 get_attr_min_length (rtx insn)
454 return get_attr_length_1 (insn, insn_min_length);
457 /* Code to handle alignment inside shorten_branches. */
459 /* Here is an explanation how the algorithm in align_fuzz can give
462 Call a sequence of instructions beginning with alignment point X
463 and continuing until the next alignment point `block X'. When `X'
464 is used in an expression, it means the alignment value of the
467 Call the distance between the start of the first insn of block X, and
468 the end of the last insn of block X `IX', for the `inner size of X'.
469 This is clearly the sum of the instruction lengths.
471 Likewise with the next alignment-delimited block following X, which we
474 Call the distance between the start of the first insn of block X, and
475 the start of the first insn of block Y `OX', for the `outer size of X'.
477 The estimated padding is then OX - IX.
479 OX can be safely estimated as
484 OX = round_up(IX, X) + Y - X
486 Clearly est(IX) >= real(IX), because that only depends on the
487 instruction lengths, and those being overestimated is a given.
489 Clearly round_up(foo, Z) >= round_up(bar, Z) if foo >= bar, so
490 we needn't worry about that when thinking about OX.
492 When X >= Y, the alignment provided by Y adds no uncertainty factor
493 for branch ranges starting before X, so we can just round what we have.
494 But when X < Y, we don't know anything about the, so to speak,
495 `middle bits', so we have to assume the worst when aligning up from an
496 address mod X to one mod Y, which is Y - X. */
499 #define LABEL_ALIGN(LABEL) align_labels_log
502 #ifndef LABEL_ALIGN_MAX_SKIP
503 #define LABEL_ALIGN_MAX_SKIP align_labels_max_skip
507 #define LOOP_ALIGN(LABEL) align_loops_log
510 #ifndef LOOP_ALIGN_MAX_SKIP
511 #define LOOP_ALIGN_MAX_SKIP align_loops_max_skip
514 #ifndef LABEL_ALIGN_AFTER_BARRIER
515 #define LABEL_ALIGN_AFTER_BARRIER(LABEL) 0
518 #ifndef LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP
519 #define LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP 0
523 #define JUMP_ALIGN(LABEL) align_jumps_log
526 #ifndef JUMP_ALIGN_MAX_SKIP
527 #define JUMP_ALIGN_MAX_SKIP align_jumps_max_skip
530 #ifndef ADDR_VEC_ALIGN
532 final_addr_vec_align (rtx addr_vec)
534 int align = GET_MODE_SIZE (GET_MODE (PATTERN (addr_vec)));
536 if (align > BIGGEST_ALIGNMENT / BITS_PER_UNIT)
537 align = BIGGEST_ALIGNMENT / BITS_PER_UNIT;
538 return exact_log2 (align);
542 #define ADDR_VEC_ALIGN(ADDR_VEC) final_addr_vec_align (ADDR_VEC)
545 #ifndef INSN_LENGTH_ALIGNMENT
546 #define INSN_LENGTH_ALIGNMENT(INSN) length_unit_log
549 #define INSN_SHUID(INSN) (uid_shuid[INSN_UID (INSN)])
551 static int min_labelno, max_labelno;
553 #define LABEL_TO_ALIGNMENT(LABEL) \
554 (label_align[CODE_LABEL_NUMBER (LABEL) - min_labelno].alignment)
556 #define LABEL_TO_MAX_SKIP(LABEL) \
557 (label_align[CODE_LABEL_NUMBER (LABEL) - min_labelno].max_skip)
559 /* For the benefit of port specific code do this also as a function. */
562 label_to_alignment (rtx label)
564 if (CODE_LABEL_NUMBER (label) <= max_labelno)
565 return LABEL_TO_ALIGNMENT (label);
570 label_to_max_skip (rtx label)
572 if (CODE_LABEL_NUMBER (label) <= max_labelno)
573 return LABEL_TO_MAX_SKIP (label);
577 #ifdef HAVE_ATTR_length
578 /* The differences in addresses
579 between a branch and its target might grow or shrink depending on
580 the alignment the start insn of the range (the branch for a forward
581 branch or the label for a backward branch) starts out on; if these
582 differences are used naively, they can even oscillate infinitely.
583 We therefore want to compute a 'worst case' address difference that
584 is independent of the alignment the start insn of the range end
585 up on, and that is at least as large as the actual difference.
586 The function align_fuzz calculates the amount we have to add to the
587 naively computed difference, by traversing the part of the alignment
588 chain of the start insn of the range that is in front of the end insn
589 of the range, and considering for each alignment the maximum amount
590 that it might contribute to a size increase.
592 For casesi tables, we also want to know worst case minimum amounts of
593 address difference, in case a machine description wants to introduce
594 some common offset that is added to all offsets in a table.
595 For this purpose, align_fuzz with a growth argument of 0 computes the
596 appropriate adjustment. */
598 /* Compute the maximum delta by which the difference of the addresses of
599 START and END might grow / shrink due to a different address for start
600 which changes the size of alignment insns between START and END.
601 KNOWN_ALIGN_LOG is the alignment known for START.
602 GROWTH should be ~0 if the objective is to compute potential code size
603 increase, and 0 if the objective is to compute potential shrink.
604 The return value is undefined for any other value of GROWTH. */
607 align_fuzz (rtx start, rtx end, int known_align_log, unsigned int growth)
609 int uid = INSN_UID (start);
611 int known_align = 1 << known_align_log;
612 int end_shuid = INSN_SHUID (end);
615 for (align_label = uid_align[uid]; align_label; align_label = uid_align[uid])
617 int align_addr, new_align;
619 uid = INSN_UID (align_label);
620 align_addr = INSN_ADDRESSES (uid) - insn_lengths[uid];
621 if (uid_shuid[uid] > end_shuid)
623 known_align_log = LABEL_TO_ALIGNMENT (align_label);
624 new_align = 1 << known_align_log;
625 if (new_align < known_align)
627 fuzz += (-align_addr ^ growth) & (new_align - known_align);
628 known_align = new_align;
633 /* Compute a worst-case reference address of a branch so that it
634 can be safely used in the presence of aligned labels. Since the
635 size of the branch itself is unknown, the size of the branch is
636 not included in the range. I.e. for a forward branch, the reference
637 address is the end address of the branch as known from the previous
638 branch shortening pass, minus a value to account for possible size
639 increase due to alignment. For a backward branch, it is the start
640 address of the branch as known from the current pass, plus a value
641 to account for possible size increase due to alignment.
642 NB.: Therefore, the maximum offset allowed for backward branches needs
643 to exclude the branch size. */
646 insn_current_reference_address (rtx branch)
651 if (! INSN_ADDRESSES_SET_P ())
654 seq = NEXT_INSN (PREV_INSN (branch));
655 seq_uid = INSN_UID (seq);
656 if (!JUMP_P (branch))
657 /* This can happen for example on the PA; the objective is to know the
658 offset to address something in front of the start of the function.
659 Thus, we can treat it like a backward branch.
660 We assume here that FUNCTION_BOUNDARY / BITS_PER_UNIT is larger than
661 any alignment we'd encounter, so we skip the call to align_fuzz. */
662 return insn_current_address;
663 dest = JUMP_LABEL (branch);
665 /* BRANCH has no proper alignment chain set, so use SEQ.
666 BRANCH also has no INSN_SHUID. */
667 if (INSN_SHUID (seq) < INSN_SHUID (dest))
669 /* Forward branch. */
670 return (insn_last_address + insn_lengths[seq_uid]
671 - align_fuzz (seq, dest, length_unit_log, ~0));
675 /* Backward branch. */
676 return (insn_current_address
677 + align_fuzz (dest, seq, length_unit_log, ~0));
680 #endif /* HAVE_ATTR_length */
682 /* Compute branch alignments based on frequency information in the
686 compute_alignments (void)
688 int log, max_skip, max_log;
691 int freq_threshold = 0;
699 max_labelno = max_label_num ();
700 min_labelno = get_first_label_num ();
701 label_align = XCNEWVEC (struct label_alignment, max_labelno - min_labelno + 1);
703 /* If not optimizing or optimizing for size, don't assign any alignments. */
704 if (! optimize || optimize_function_for_size_p (cfun))
709 dump_flow_info (dump_file, TDF_DETAILS);
710 flow_loops_dump (dump_file, NULL, 1);
711 loop_optimizer_init (AVOID_CFG_MODIFICATIONS);
714 if (bb->frequency > freq_max)
715 freq_max = bb->frequency;
716 freq_threshold = freq_max / PARAM_VALUE (PARAM_ALIGN_THRESHOLD);
719 fprintf(dump_file, "freq_max: %i\n",freq_max);
722 rtx label = BB_HEAD (bb);
723 int fallthru_frequency = 0, branch_frequency = 0, has_fallthru = 0;
728 || optimize_bb_for_size_p (bb))
731 fprintf(dump_file, "BB %4i freq %4i loop %2i loop_depth %2i skipped.\n",
732 bb->index, bb->frequency, bb->loop_father->num, bb->loop_depth);
735 max_log = LABEL_ALIGN (label);
736 max_skip = LABEL_ALIGN_MAX_SKIP;
738 FOR_EACH_EDGE (e, ei, bb->preds)
740 if (e->flags & EDGE_FALLTHRU)
741 has_fallthru = 1, fallthru_frequency += EDGE_FREQUENCY (e);
743 branch_frequency += EDGE_FREQUENCY (e);
747 fprintf(dump_file, "BB %4i freq %4i loop %2i loop_depth %2i fall %4i branch %4i",
748 bb->index, bb->frequency, bb->loop_father->num,
750 fallthru_frequency, branch_frequency);
751 if (!bb->loop_father->inner && bb->loop_father->num)
752 fprintf (dump_file, " inner_loop");
753 if (bb->loop_father->header == bb)
754 fprintf (dump_file, " loop_header");
755 fprintf (dump_file, "\n");
758 /* There are two purposes to align block with no fallthru incoming edge:
759 1) to avoid fetch stalls when branch destination is near cache boundary
760 2) to improve cache efficiency in case the previous block is not executed
761 (so it does not need to be in the cache).
763 We to catch first case, we align frequently executed blocks.
764 To catch the second, we align blocks that are executed more frequently
765 than the predecessor and the predecessor is likely to not be executed
766 when function is called. */
769 && (branch_frequency > freq_threshold
770 || (bb->frequency > bb->prev_bb->frequency * 10
771 && (bb->prev_bb->frequency
772 <= ENTRY_BLOCK_PTR->frequency / 2))))
774 log = JUMP_ALIGN (label);
776 fprintf(dump_file, " jump alignment added.\n");
780 max_skip = JUMP_ALIGN_MAX_SKIP;
783 /* In case block is frequent and reached mostly by non-fallthru edge,
784 align it. It is most likely a first block of loop. */
786 && optimize_bb_for_speed_p (bb)
787 && branch_frequency + fallthru_frequency > freq_threshold
789 > fallthru_frequency * PARAM_VALUE (PARAM_ALIGN_LOOP_ITERATIONS)))
791 log = LOOP_ALIGN (label);
793 fprintf(dump_file, " internal loop alignment added.\n");
797 max_skip = LOOP_ALIGN_MAX_SKIP;
800 LABEL_TO_ALIGNMENT (label) = max_log;
801 LABEL_TO_MAX_SKIP (label) = max_skip;
806 loop_optimizer_finalize ();
807 free_dominance_info (CDI_DOMINATORS);
812 struct rtl_opt_pass pass_compute_alignments =
816 "alignments", /* name */
818 compute_alignments, /* execute */
821 0, /* static_pass_number */
823 0, /* properties_required */
824 0, /* properties_provided */
825 0, /* properties_destroyed */
826 0, /* todo_flags_start */
827 TODO_dump_func | TODO_verify_rtl_sharing
828 | TODO_ggc_collect /* todo_flags_finish */
833 /* Make a pass over all insns and compute their actual lengths by shortening
834 any branches of variable length if possible. */
836 /* shorten_branches might be called multiple times: for example, the SH
837 port splits out-of-range conditional branches in MACHINE_DEPENDENT_REORG.
838 In order to do this, it needs proper length information, which it obtains
839 by calling shorten_branches. This cannot be collapsed with
840 shorten_branches itself into a single pass unless we also want to integrate
841 reorg.c, since the branch splitting exposes new instructions with delay
845 shorten_branches (rtx first ATTRIBUTE_UNUSED)
852 #ifdef HAVE_ATTR_length
853 #define MAX_CODE_ALIGN 16
855 int something_changed = 1;
856 char *varying_length;
859 rtx align_tab[MAX_CODE_ALIGN];
863 /* Compute maximum UID and allocate label_align / uid_shuid. */
864 max_uid = get_max_uid ();
866 /* Free uid_shuid before reallocating it. */
869 uid_shuid = XNEWVEC (int, max_uid);
871 if (max_labelno != max_label_num ())
873 int old = max_labelno;
877 max_labelno = max_label_num ();
879 n_labels = max_labelno - min_labelno + 1;
880 n_old_labels = old - min_labelno + 1;
882 label_align = XRESIZEVEC (struct label_alignment, label_align, n_labels);
884 /* Range of labels grows monotonically in the function. Failing here
885 means that the initialization of array got lost. */
886 gcc_assert (n_old_labels <= n_labels);
888 memset (label_align + n_old_labels, 0,
889 (n_labels - n_old_labels) * sizeof (struct label_alignment));
892 /* Initialize label_align and set up uid_shuid to be strictly
893 monotonically rising with insn order. */
894 /* We use max_log here to keep track of the maximum alignment we want to
895 impose on the next CODE_LABEL (or the current one if we are processing
896 the CODE_LABEL itself). */
901 for (insn = get_insns (), i = 1; insn; insn = NEXT_INSN (insn))
905 INSN_SHUID (insn) = i++;
912 bool next_is_jumptable;
914 /* Merge in alignments computed by compute_alignments. */
915 log = LABEL_TO_ALIGNMENT (insn);
919 max_skip = LABEL_TO_MAX_SKIP (insn);
922 next = next_nonnote_insn (insn);
923 next_is_jumptable = next && JUMP_TABLE_DATA_P (next);
924 if (!next_is_jumptable)
926 log = LABEL_ALIGN (insn);
930 max_skip = LABEL_ALIGN_MAX_SKIP;
933 /* ADDR_VECs only take room if read-only data goes into the text
935 if ((JUMP_TABLES_IN_TEXT_SECTION
936 || readonly_data_section == text_section)
937 && next_is_jumptable)
939 log = ADDR_VEC_ALIGN (next);
943 max_skip = LABEL_ALIGN_MAX_SKIP;
946 LABEL_TO_ALIGNMENT (insn) = max_log;
947 LABEL_TO_MAX_SKIP (insn) = max_skip;
951 else if (BARRIER_P (insn))
955 for (label = insn; label && ! INSN_P (label);
956 label = NEXT_INSN (label))
959 log = LABEL_ALIGN_AFTER_BARRIER (insn);
963 max_skip = LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP;
969 #ifdef HAVE_ATTR_length
971 /* Allocate the rest of the arrays. */
972 insn_lengths = XNEWVEC (int, max_uid);
973 insn_lengths_max_uid = max_uid;
974 /* Syntax errors can lead to labels being outside of the main insn stream.
975 Initialize insn_addresses, so that we get reproducible results. */
976 INSN_ADDRESSES_ALLOC (max_uid);
978 varying_length = XCNEWVEC (char, max_uid);
980 /* Initialize uid_align. We scan instructions
981 from end to start, and keep in align_tab[n] the last seen insn
982 that does an alignment of at least n+1, i.e. the successor
983 in the alignment chain for an insn that does / has a known
985 uid_align = XCNEWVEC (rtx, max_uid);
987 for (i = MAX_CODE_ALIGN; --i >= 0;)
988 align_tab[i] = NULL_RTX;
989 seq = get_last_insn ();
990 for (; seq; seq = PREV_INSN (seq))
992 int uid = INSN_UID (seq);
994 log = (LABEL_P (seq) ? LABEL_TO_ALIGNMENT (seq) : 0);
995 uid_align[uid] = align_tab[0];
998 /* Found an alignment label. */
999 uid_align[uid] = align_tab[log];
1000 for (i = log - 1; i >= 0; i--)
1004 #ifdef CASE_VECTOR_SHORTEN_MODE
1007 /* Look for ADDR_DIFF_VECs, and initialize their minimum and maximum
1010 int min_shuid = INSN_SHUID (get_insns ()) - 1;
1011 int max_shuid = INSN_SHUID (get_last_insn ()) + 1;
1014 for (insn = first; insn != 0; insn = NEXT_INSN (insn))
1016 rtx min_lab = NULL_RTX, max_lab = NULL_RTX, pat;
1017 int len, i, min, max, insn_shuid;
1019 addr_diff_vec_flags flags;
1022 || GET_CODE (PATTERN (insn)) != ADDR_DIFF_VEC)
1024 pat = PATTERN (insn);
1025 len = XVECLEN (pat, 1);
1026 gcc_assert (len > 0);
1027 min_align = MAX_CODE_ALIGN;
1028 for (min = max_shuid, max = min_shuid, i = len - 1; i >= 0; i--)
1030 rtx lab = XEXP (XVECEXP (pat, 1, i), 0);
1031 int shuid = INSN_SHUID (lab);
1042 if (min_align > LABEL_TO_ALIGNMENT (lab))
1043 min_align = LABEL_TO_ALIGNMENT (lab);
1045 XEXP (pat, 2) = gen_rtx_LABEL_REF (Pmode, min_lab);
1046 XEXP (pat, 3) = gen_rtx_LABEL_REF (Pmode, max_lab);
1047 insn_shuid = INSN_SHUID (insn);
1048 rel = INSN_SHUID (XEXP (XEXP (pat, 0), 0));
1049 memset (&flags, 0, sizeof (flags));
1050 flags.min_align = min_align;
1051 flags.base_after_vec = rel > insn_shuid;
1052 flags.min_after_vec = min > insn_shuid;
1053 flags.max_after_vec = max > insn_shuid;
1054 flags.min_after_base = min > rel;
1055 flags.max_after_base = max > rel;
1056 ADDR_DIFF_VEC_FLAGS (pat) = flags;
1059 #endif /* CASE_VECTOR_SHORTEN_MODE */
1061 /* Compute initial lengths, addresses, and varying flags for each insn. */
1062 for (insn_current_address = 0, insn = first;
1064 insn_current_address += insn_lengths[uid], insn = NEXT_INSN (insn))
1066 uid = INSN_UID (insn);
1068 insn_lengths[uid] = 0;
1072 int log = LABEL_TO_ALIGNMENT (insn);
1075 int align = 1 << log;
1076 int new_address = (insn_current_address + align - 1) & -align;
1077 insn_lengths[uid] = new_address - insn_current_address;
1081 INSN_ADDRESSES (uid) = insn_current_address + insn_lengths[uid];
1083 if (NOTE_P (insn) || BARRIER_P (insn)
1086 if (INSN_DELETED_P (insn))
1089 body = PATTERN (insn);
1090 if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
1092 /* This only takes room if read-only data goes into the text
1094 if (JUMP_TABLES_IN_TEXT_SECTION
1095 || readonly_data_section == text_section)
1096 insn_lengths[uid] = (XVECLEN (body,
1097 GET_CODE (body) == ADDR_DIFF_VEC)
1098 * GET_MODE_SIZE (GET_MODE (body)));
1099 /* Alignment is handled by ADDR_VEC_ALIGN. */
1101 else if (GET_CODE (body) == ASM_INPUT || asm_noperands (body) >= 0)
1102 insn_lengths[uid] = asm_insn_count (body) * insn_default_length (insn);
1103 else if (GET_CODE (body) == SEQUENCE)
1106 int const_delay_slots;
1108 const_delay_slots = const_num_delay_slots (XVECEXP (body, 0, 0));
1110 const_delay_slots = 0;
1112 /* Inside a delay slot sequence, we do not do any branch shortening
1113 if the shortening could change the number of delay slots
1115 for (i = 0; i < XVECLEN (body, 0); i++)
1117 rtx inner_insn = XVECEXP (body, 0, i);
1118 int inner_uid = INSN_UID (inner_insn);
1121 if (GET_CODE (body) == ASM_INPUT
1122 || asm_noperands (PATTERN (XVECEXP (body, 0, i))) >= 0)
1123 inner_length = (asm_insn_count (PATTERN (inner_insn))
1124 * insn_default_length (inner_insn));
1126 inner_length = insn_default_length (inner_insn);
1128 insn_lengths[inner_uid] = inner_length;
1129 if (const_delay_slots)
1131 if ((varying_length[inner_uid]
1132 = insn_variable_length_p (inner_insn)) != 0)
1133 varying_length[uid] = 1;
1134 INSN_ADDRESSES (inner_uid) = (insn_current_address
1135 + insn_lengths[uid]);
1138 varying_length[inner_uid] = 0;
1139 insn_lengths[uid] += inner_length;
1142 else if (GET_CODE (body) != USE && GET_CODE (body) != CLOBBER)
1144 insn_lengths[uid] = insn_default_length (insn);
1145 varying_length[uid] = insn_variable_length_p (insn);
1148 /* If needed, do any adjustment. */
1149 #ifdef ADJUST_INSN_LENGTH
1150 ADJUST_INSN_LENGTH (insn, insn_lengths[uid]);
1151 if (insn_lengths[uid] < 0)
1152 fatal_insn ("negative insn length", insn);
1156 /* Now loop over all the insns finding varying length insns. For each,
1157 get the current insn length. If it has changed, reflect the change.
1158 When nothing changes for a full pass, we are done. */
1160 while (something_changed)
1162 something_changed = 0;
1163 insn_current_align = MAX_CODE_ALIGN - 1;
1164 for (insn_current_address = 0, insn = first;
1166 insn = NEXT_INSN (insn))
1169 #ifdef ADJUST_INSN_LENGTH
1174 uid = INSN_UID (insn);
1178 int log = LABEL_TO_ALIGNMENT (insn);
1179 if (log > insn_current_align)
1181 int align = 1 << log;
1182 int new_address= (insn_current_address + align - 1) & -align;
1183 insn_lengths[uid] = new_address - insn_current_address;
1184 insn_current_align = log;
1185 insn_current_address = new_address;
1188 insn_lengths[uid] = 0;
1189 INSN_ADDRESSES (uid) = insn_current_address;
1193 length_align = INSN_LENGTH_ALIGNMENT (insn);
1194 if (length_align < insn_current_align)
1195 insn_current_align = length_align;
1197 insn_last_address = INSN_ADDRESSES (uid);
1198 INSN_ADDRESSES (uid) = insn_current_address;
1200 #ifdef CASE_VECTOR_SHORTEN_MODE
1201 if (optimize && JUMP_P (insn)
1202 && GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC)
1204 rtx body = PATTERN (insn);
1205 int old_length = insn_lengths[uid];
1206 rtx rel_lab = XEXP (XEXP (body, 0), 0);
1207 rtx min_lab = XEXP (XEXP (body, 2), 0);
1208 rtx max_lab = XEXP (XEXP (body, 3), 0);
1209 int rel_addr = INSN_ADDRESSES (INSN_UID (rel_lab));
1210 int min_addr = INSN_ADDRESSES (INSN_UID (min_lab));
1211 int max_addr = INSN_ADDRESSES (INSN_UID (max_lab));
1214 addr_diff_vec_flags flags;
1216 /* Avoid automatic aggregate initialization. */
1217 flags = ADDR_DIFF_VEC_FLAGS (body);
1219 /* Try to find a known alignment for rel_lab. */
1220 for (prev = rel_lab;
1222 && ! insn_lengths[INSN_UID (prev)]
1223 && ! (varying_length[INSN_UID (prev)] & 1);
1224 prev = PREV_INSN (prev))
1225 if (varying_length[INSN_UID (prev)] & 2)
1227 rel_align = LABEL_TO_ALIGNMENT (prev);
1231 /* See the comment on addr_diff_vec_flags in rtl.h for the
1232 meaning of the flags values. base: REL_LAB vec: INSN */
1233 /* Anything after INSN has still addresses from the last
1234 pass; adjust these so that they reflect our current
1235 estimate for this pass. */
1236 if (flags.base_after_vec)
1237 rel_addr += insn_current_address - insn_last_address;
1238 if (flags.min_after_vec)
1239 min_addr += insn_current_address - insn_last_address;
1240 if (flags.max_after_vec)
1241 max_addr += insn_current_address - insn_last_address;
1242 /* We want to know the worst case, i.e. lowest possible value
1243 for the offset of MIN_LAB. If MIN_LAB is after REL_LAB,
1244 its offset is positive, and we have to be wary of code shrink;
1245 otherwise, it is negative, and we have to be vary of code
1247 if (flags.min_after_base)
1249 /* If INSN is between REL_LAB and MIN_LAB, the size
1250 changes we are about to make can change the alignment
1251 within the observed offset, therefore we have to break
1252 it up into two parts that are independent. */
1253 if (! flags.base_after_vec && flags.min_after_vec)
1255 min_addr -= align_fuzz (rel_lab, insn, rel_align, 0);
1256 min_addr -= align_fuzz (insn, min_lab, 0, 0);
1259 min_addr -= align_fuzz (rel_lab, min_lab, rel_align, 0);
1263 if (flags.base_after_vec && ! flags.min_after_vec)
1265 min_addr -= align_fuzz (min_lab, insn, 0, ~0);
1266 min_addr -= align_fuzz (insn, rel_lab, 0, ~0);
1269 min_addr -= align_fuzz (min_lab, rel_lab, 0, ~0);
1271 /* Likewise, determine the highest lowest possible value
1272 for the offset of MAX_LAB. */
1273 if (flags.max_after_base)
1275 if (! flags.base_after_vec && flags.max_after_vec)
1277 max_addr += align_fuzz (rel_lab, insn, rel_align, ~0);
1278 max_addr += align_fuzz (insn, max_lab, 0, ~0);
1281 max_addr += align_fuzz (rel_lab, max_lab, rel_align, ~0);
1285 if (flags.base_after_vec && ! flags.max_after_vec)
1287 max_addr += align_fuzz (max_lab, insn, 0, 0);
1288 max_addr += align_fuzz (insn, rel_lab, 0, 0);
1291 max_addr += align_fuzz (max_lab, rel_lab, 0, 0);
1293 PUT_MODE (body, CASE_VECTOR_SHORTEN_MODE (min_addr - rel_addr,
1294 max_addr - rel_addr,
1296 if (JUMP_TABLES_IN_TEXT_SECTION
1297 || readonly_data_section == text_section)
1300 = (XVECLEN (body, 1) * GET_MODE_SIZE (GET_MODE (body)));
1301 insn_current_address += insn_lengths[uid];
1302 if (insn_lengths[uid] != old_length)
1303 something_changed = 1;
1308 #endif /* CASE_VECTOR_SHORTEN_MODE */
1310 if (! (varying_length[uid]))
1312 if (NONJUMP_INSN_P (insn)
1313 && GET_CODE (PATTERN (insn)) == SEQUENCE)
1317 body = PATTERN (insn);
1318 for (i = 0; i < XVECLEN (body, 0); i++)
1320 rtx inner_insn = XVECEXP (body, 0, i);
1321 int inner_uid = INSN_UID (inner_insn);
1323 INSN_ADDRESSES (inner_uid) = insn_current_address;
1325 insn_current_address += insn_lengths[inner_uid];
1329 insn_current_address += insn_lengths[uid];
1334 if (NONJUMP_INSN_P (insn) && GET_CODE (PATTERN (insn)) == SEQUENCE)
1338 body = PATTERN (insn);
1340 for (i = 0; i < XVECLEN (body, 0); i++)
1342 rtx inner_insn = XVECEXP (body, 0, i);
1343 int inner_uid = INSN_UID (inner_insn);
1346 INSN_ADDRESSES (inner_uid) = insn_current_address;
1348 /* insn_current_length returns 0 for insns with a
1349 non-varying length. */
1350 if (! varying_length[inner_uid])
1351 inner_length = insn_lengths[inner_uid];
1353 inner_length = insn_current_length (inner_insn);
1355 if (inner_length != insn_lengths[inner_uid])
1357 insn_lengths[inner_uid] = inner_length;
1358 something_changed = 1;
1360 insn_current_address += insn_lengths[inner_uid];
1361 new_length += inner_length;
1366 new_length = insn_current_length (insn);
1367 insn_current_address += new_length;
1370 #ifdef ADJUST_INSN_LENGTH
1371 /* If needed, do any adjustment. */
1372 tmp_length = new_length;
1373 ADJUST_INSN_LENGTH (insn, new_length);
1374 insn_current_address += (new_length - tmp_length);
1377 if (new_length != insn_lengths[uid])
1379 insn_lengths[uid] = new_length;
1380 something_changed = 1;
1383 /* For a non-optimizing compile, do only a single pass. */
1388 free (varying_length);
1390 #endif /* HAVE_ATTR_length */
1393 #ifdef HAVE_ATTR_length
1394 /* Given the body of an INSN known to be generated by an ASM statement, return
1395 the number of machine instructions likely to be generated for this insn.
1396 This is used to compute its length. */
1399 asm_insn_count (rtx body)
1404 if (GET_CODE (body) == ASM_INPUT)
1405 templ = XSTR (body, 0);
1407 templ = decode_asm_operands (body, NULL, NULL, NULL, NULL, NULL);
1412 for (; *templ; templ++)
1413 if (IS_ASM_LOGICAL_LINE_SEPARATOR (*templ, templ)
1421 /* ??? This is probably the wrong place for these. */
1422 /* Structure recording the mapping from source file and directory
1423 names at compile time to those to be embedded in debug
1425 typedef struct debug_prefix_map
1427 const char *old_prefix;
1428 const char *new_prefix;
1431 struct debug_prefix_map *next;
1434 /* Linked list of such structures. */
1435 debug_prefix_map *debug_prefix_maps;
1438 /* Record a debug file prefix mapping. ARG is the argument to
1439 -fdebug-prefix-map and must be of the form OLD=NEW. */
1442 add_debug_prefix_map (const char *arg)
1444 debug_prefix_map *map;
1447 p = strchr (arg, '=');
1450 error ("invalid argument %qs to -fdebug-prefix-map", arg);
1453 map = XNEW (debug_prefix_map);
1454 map->old_prefix = xstrndup (arg, p - arg);
1455 map->old_len = p - arg;
1457 map->new_prefix = xstrdup (p);
1458 map->new_len = strlen (p);
1459 map->next = debug_prefix_maps;
1460 debug_prefix_maps = map;
1463 /* Perform user-specified mapping of debug filename prefixes. Return
1464 the new name corresponding to FILENAME. */
1467 remap_debug_filename (const char *filename)
1469 debug_prefix_map *map;
1474 for (map = debug_prefix_maps; map; map = map->next)
1475 if (strncmp (filename, map->old_prefix, map->old_len) == 0)
1479 name = filename + map->old_len;
1480 name_len = strlen (name) + 1;
1481 s = (char *) alloca (name_len + map->new_len);
1482 memcpy (s, map->new_prefix, map->new_len);
1483 memcpy (s + map->new_len, name, name_len);
1484 return ggc_strdup (s);
1487 /* Output assembler code for the start of a function,
1488 and initialize some of the variables in this file
1489 for the new function. The label for the function and associated
1490 assembler pseudo-ops have already been output in `assemble_start_function'.
1492 FIRST is the first insn of the rtl for the function being compiled.
1493 FILE is the file to write assembler code to.
1494 OPTIMIZE is nonzero if we should eliminate redundant
1495 test and compare insns. */
1498 final_start_function (rtx first ATTRIBUTE_UNUSED, FILE *file,
1499 int optimize ATTRIBUTE_UNUSED)
1503 this_is_asm_operands = 0;
1505 last_filename = locator_file (prologue_locator);
1506 last_linenum = locator_line (prologue_locator);
1507 last_discriminator = discriminator = 0;
1509 high_block_linenum = high_function_linenum = last_linenum;
1511 (*debug_hooks->begin_prologue) (last_linenum, last_filename);
1513 #if defined (DWARF2_UNWIND_INFO) || defined (TARGET_UNWIND_INFO)
1514 if (write_symbols != DWARF2_DEBUG && write_symbols != VMS_AND_DWARF2_DEBUG)
1515 dwarf2out_begin_prologue (0, NULL);
1518 #ifdef LEAF_REG_REMAP
1519 if (current_function_uses_only_leaf_regs)
1520 leaf_renumber_regs (first);
1523 /* The Sun386i and perhaps other machines don't work right
1524 if the profiling code comes after the prologue. */
1525 #ifdef PROFILE_BEFORE_PROLOGUE
1527 profile_function (file);
1528 #endif /* PROFILE_BEFORE_PROLOGUE */
1530 #if defined (DWARF2_UNWIND_INFO) && defined (HAVE_prologue)
1531 if (dwarf2out_do_frame ())
1532 dwarf2out_frame_debug (NULL_RTX, false);
1535 /* If debugging, assign block numbers to all of the blocks in this
1539 reemit_insn_block_notes ();
1540 number_blocks (current_function_decl);
1541 /* We never actually put out begin/end notes for the top-level
1542 block in the function. But, conceptually, that block is
1544 TREE_ASM_WRITTEN (DECL_INITIAL (current_function_decl)) = 1;
1547 if (warn_frame_larger_than
1548 && get_frame_size () > frame_larger_than_size)
1550 /* Issue a warning */
1551 warning (OPT_Wframe_larger_than_,
1552 "the frame size of %wd bytes is larger than %wd bytes",
1553 get_frame_size (), frame_larger_than_size);
1556 /* First output the function prologue: code to set up the stack frame. */
1557 targetm.asm_out.function_prologue (file, get_frame_size ());
1559 /* If the machine represents the prologue as RTL, the profiling code must
1560 be emitted when NOTE_INSN_PROLOGUE_END is scanned. */
1561 #ifdef HAVE_prologue
1562 if (! HAVE_prologue)
1564 profile_after_prologue (file);
1568 profile_after_prologue (FILE *file ATTRIBUTE_UNUSED)
1570 #ifndef PROFILE_BEFORE_PROLOGUE
1572 profile_function (file);
1573 #endif /* not PROFILE_BEFORE_PROLOGUE */
1577 profile_function (FILE *file ATTRIBUTE_UNUSED)
1579 #ifndef NO_PROFILE_COUNTERS
1580 # define NO_PROFILE_COUNTERS 0
1582 #if defined(ASM_OUTPUT_REG_PUSH)
1583 int sval = cfun->returns_struct;
1584 rtx svrtx = targetm.calls.struct_value_rtx (TREE_TYPE (current_function_decl), 1);
1585 #if defined(STATIC_CHAIN_INCOMING_REGNUM) || defined(STATIC_CHAIN_REGNUM)
1586 int cxt = cfun->static_chain_decl != NULL;
1588 #endif /* ASM_OUTPUT_REG_PUSH */
1590 if (! NO_PROFILE_COUNTERS)
1592 int align = MIN (BIGGEST_ALIGNMENT, LONG_TYPE_SIZE);
1593 switch_to_section (data_section);
1594 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
1595 targetm.asm_out.internal_label (file, "LP", current_function_funcdef_no);
1596 assemble_integer (const0_rtx, LONG_TYPE_SIZE / BITS_PER_UNIT, align, 1);
1599 switch_to_section (current_function_section ());
1601 #if defined(ASM_OUTPUT_REG_PUSH)
1602 if (sval && svrtx != NULL_RTX && REG_P (svrtx))
1604 ASM_OUTPUT_REG_PUSH (file, REGNO (svrtx));
1608 #if defined(STATIC_CHAIN_INCOMING_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1610 ASM_OUTPUT_REG_PUSH (file, STATIC_CHAIN_INCOMING_REGNUM);
1612 #if defined(STATIC_CHAIN_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1615 ASM_OUTPUT_REG_PUSH (file, STATIC_CHAIN_REGNUM);
1620 FUNCTION_PROFILER (file, current_function_funcdef_no);
1622 #if defined(STATIC_CHAIN_INCOMING_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1624 ASM_OUTPUT_REG_POP (file, STATIC_CHAIN_INCOMING_REGNUM);
1626 #if defined(STATIC_CHAIN_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1629 ASM_OUTPUT_REG_POP (file, STATIC_CHAIN_REGNUM);
1634 #if defined(ASM_OUTPUT_REG_PUSH)
1635 if (sval && svrtx != NULL_RTX && REG_P (svrtx))
1637 ASM_OUTPUT_REG_POP (file, REGNO (svrtx));
1642 /* Output assembler code for the end of a function.
1643 For clarity, args are same as those of `final_start_function'
1644 even though not all of them are needed. */
1647 final_end_function (void)
1651 (*debug_hooks->end_function) (high_function_linenum);
1653 /* Finally, output the function epilogue:
1654 code to restore the stack frame and return to the caller. */
1655 targetm.asm_out.function_epilogue (asm_out_file, get_frame_size ());
1657 /* And debug output. */
1658 (*debug_hooks->end_epilogue) (last_linenum, last_filename);
1660 #if defined (DWARF2_UNWIND_INFO)
1661 if (write_symbols != DWARF2_DEBUG && write_symbols != VMS_AND_DWARF2_DEBUG
1662 && dwarf2out_do_frame ())
1663 dwarf2out_end_epilogue (last_linenum, last_filename);
1667 /* Output assembler code for some insns: all or part of a function.
1668 For description of args, see `final_start_function', above. */
1671 final (rtx first, FILE *file, int optimize)
1677 last_ignored_compare = 0;
1679 for (insn = first; insn; insn = NEXT_INSN (insn))
1681 if (INSN_UID (insn) > max_uid) /* Find largest UID. */
1682 max_uid = INSN_UID (insn);
1684 /* If CC tracking across branches is enabled, record the insn which
1685 jumps to each branch only reached from one place. */
1686 if (optimize && JUMP_P (insn))
1688 rtx lab = JUMP_LABEL (insn);
1689 if (lab && LABEL_NUSES (lab) == 1)
1691 LABEL_REFS (lab) = insn;
1701 /* Output the insns. */
1702 for (insn = first; insn;)
1704 #ifdef HAVE_ATTR_length
1705 if ((unsigned) INSN_UID (insn) >= INSN_ADDRESSES_SIZE ())
1707 /* This can be triggered by bugs elsewhere in the compiler if
1708 new insns are created after init_insn_lengths is called. */
1709 gcc_assert (NOTE_P (insn));
1710 insn_current_address = -1;
1713 insn_current_address = INSN_ADDRESSES (INSN_UID (insn));
1714 #endif /* HAVE_ATTR_length */
1716 insn = final_scan_insn (insn, file, optimize, 0, &seen);
1721 get_insn_template (int code, rtx insn)
1723 switch (insn_data[code].output_format)
1725 case INSN_OUTPUT_FORMAT_SINGLE:
1726 return insn_data[code].output.single;
1727 case INSN_OUTPUT_FORMAT_MULTI:
1728 return insn_data[code].output.multi[which_alternative];
1729 case INSN_OUTPUT_FORMAT_FUNCTION:
1731 return (*insn_data[code].output.function) (recog_data.operand, insn);
1738 /* Emit the appropriate declaration for an alternate-entry-point
1739 symbol represented by INSN, to FILE. INSN is a CODE_LABEL with
1740 LABEL_KIND != LABEL_NORMAL.
1742 The case fall-through in this function is intentional. */
1744 output_alternate_entry_point (FILE *file, rtx insn)
1746 const char *name = LABEL_NAME (insn);
1748 switch (LABEL_KIND (insn))
1750 case LABEL_WEAK_ENTRY:
1751 #ifdef ASM_WEAKEN_LABEL
1752 ASM_WEAKEN_LABEL (file, name);
1754 case LABEL_GLOBAL_ENTRY:
1755 targetm.asm_out.globalize_label (file, name);
1756 case LABEL_STATIC_ENTRY:
1757 #ifdef ASM_OUTPUT_TYPE_DIRECTIVE
1758 ASM_OUTPUT_TYPE_DIRECTIVE (file, name, "function");
1760 ASM_OUTPUT_LABEL (file, name);
1769 /* Given a CALL_INSN, find and return the nested CALL. */
1771 call_from_call_insn (rtx insn)
1774 gcc_assert (CALL_P (insn));
1777 while (GET_CODE (x) != CALL)
1779 switch (GET_CODE (x))
1784 x = COND_EXEC_CODE (x);
1787 x = XVECEXP (x, 0, 0);
1797 /* The final scan for one insn, INSN.
1798 Args are same as in `final', except that INSN
1799 is the insn being scanned.
1800 Value returned is the next insn to be scanned.
1802 NOPEEPHOLES is the flag to disallow peephole processing (currently
1803 used for within delayed branch sequence output).
1805 SEEN is used to track the end of the prologue, for emitting
1806 debug information. We force the emission of a line note after
1807 both NOTE_INSN_PROLOGUE_END and NOTE_INSN_FUNCTION_BEG, or
1808 at the beginning of the second basic block, whichever comes
1812 final_scan_insn (rtx insn, FILE *file, int optimize ATTRIBUTE_UNUSED,
1813 int nopeepholes ATTRIBUTE_UNUSED, int *seen)
1822 /* Ignore deleted insns. These can occur when we split insns (due to a
1823 template of "#") while not optimizing. */
1824 if (INSN_DELETED_P (insn))
1825 return NEXT_INSN (insn);
1827 switch (GET_CODE (insn))
1830 switch (NOTE_KIND (insn))
1832 case NOTE_INSN_DELETED:
1835 case NOTE_INSN_SWITCH_TEXT_SECTIONS:
1836 in_cold_section_p = !in_cold_section_p;
1837 #ifdef DWARF2_UNWIND_INFO
1838 if (dwarf2out_do_frame ())
1839 dwarf2out_switch_text_section ();
1842 (*debug_hooks->switch_text_section) ();
1844 switch_to_section (current_function_section ());
1847 case NOTE_INSN_BASIC_BLOCK:
1848 #ifdef TARGET_UNWIND_INFO
1849 targetm.asm_out.unwind_emit (asm_out_file, insn);
1853 fprintf (asm_out_file, "\t%s basic block %d\n",
1854 ASM_COMMENT_START, NOTE_BASIC_BLOCK (insn)->index);
1856 if ((*seen & (SEEN_EMITTED | SEEN_BB)) == SEEN_BB)
1858 *seen |= SEEN_EMITTED;
1859 force_source_line = true;
1864 discriminator = NOTE_BASIC_BLOCK (insn)->discriminator;
1868 case NOTE_INSN_EH_REGION_BEG:
1869 ASM_OUTPUT_DEBUG_LABEL (asm_out_file, "LEHB",
1870 NOTE_EH_HANDLER (insn));
1873 case NOTE_INSN_EH_REGION_END:
1874 ASM_OUTPUT_DEBUG_LABEL (asm_out_file, "LEHE",
1875 NOTE_EH_HANDLER (insn));
1878 case NOTE_INSN_PROLOGUE_END:
1879 targetm.asm_out.function_end_prologue (file);
1880 profile_after_prologue (file);
1882 if ((*seen & (SEEN_EMITTED | SEEN_NOTE)) == SEEN_NOTE)
1884 *seen |= SEEN_EMITTED;
1885 force_source_line = true;
1892 case NOTE_INSN_EPILOGUE_BEG:
1893 #if defined (DWARF2_UNWIND_INFO) && defined (HAVE_epilogue)
1894 if (dwarf2out_do_frame ())
1895 dwarf2out_begin_epilogue (insn);
1897 targetm.asm_out.function_begin_epilogue (file);
1900 case NOTE_INSN_CFA_RESTORE_STATE:
1901 #if defined (DWARF2_UNWIND_INFO)
1902 dwarf2out_frame_debug_restore_state ();
1906 case NOTE_INSN_FUNCTION_BEG:
1908 (*debug_hooks->end_prologue) (last_linenum, last_filename);
1910 if ((*seen & (SEEN_EMITTED | SEEN_NOTE)) == SEEN_NOTE)
1912 *seen |= SEEN_EMITTED;
1913 force_source_line = true;
1920 case NOTE_INSN_BLOCK_BEG:
1921 if (debug_info_level == DINFO_LEVEL_NORMAL
1922 || debug_info_level == DINFO_LEVEL_VERBOSE
1923 || write_symbols == DWARF2_DEBUG
1924 || write_symbols == VMS_AND_DWARF2_DEBUG
1925 || write_symbols == VMS_DEBUG)
1927 int n = BLOCK_NUMBER (NOTE_BLOCK (insn));
1931 high_block_linenum = last_linenum;
1933 /* Output debugging info about the symbol-block beginning. */
1934 (*debug_hooks->begin_block) (last_linenum, n);
1936 /* Mark this block as output. */
1937 TREE_ASM_WRITTEN (NOTE_BLOCK (insn)) = 1;
1939 if (write_symbols == DBX_DEBUG
1940 || write_symbols == SDB_DEBUG)
1942 location_t *locus_ptr
1943 = block_nonartificial_location (NOTE_BLOCK (insn));
1945 if (locus_ptr != NULL)
1947 override_filename = LOCATION_FILE (*locus_ptr);
1948 override_linenum = LOCATION_LINE (*locus_ptr);
1953 case NOTE_INSN_BLOCK_END:
1954 if (debug_info_level == DINFO_LEVEL_NORMAL
1955 || debug_info_level == DINFO_LEVEL_VERBOSE
1956 || write_symbols == DWARF2_DEBUG
1957 || write_symbols == VMS_AND_DWARF2_DEBUG
1958 || write_symbols == VMS_DEBUG)
1960 int n = BLOCK_NUMBER (NOTE_BLOCK (insn));
1964 /* End of a symbol-block. */
1966 gcc_assert (block_depth >= 0);
1968 (*debug_hooks->end_block) (high_block_linenum, n);
1970 if (write_symbols == DBX_DEBUG
1971 || write_symbols == SDB_DEBUG)
1973 tree outer_block = BLOCK_SUPERCONTEXT (NOTE_BLOCK (insn));
1974 location_t *locus_ptr
1975 = block_nonartificial_location (outer_block);
1977 if (locus_ptr != NULL)
1979 override_filename = LOCATION_FILE (*locus_ptr);
1980 override_linenum = LOCATION_LINE (*locus_ptr);
1984 override_filename = NULL;
1985 override_linenum = 0;
1990 case NOTE_INSN_DELETED_LABEL:
1991 /* Emit the label. We may have deleted the CODE_LABEL because
1992 the label could be proved to be unreachable, though still
1993 referenced (in the form of having its address taken. */
1994 ASM_OUTPUT_DEBUG_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
1997 case NOTE_INSN_VAR_LOCATION:
1998 (*debug_hooks->var_location) (insn);
2008 #if defined (DWARF2_UNWIND_INFO)
2009 if (dwarf2out_do_frame ())
2010 dwarf2out_frame_debug (insn, false);
2015 /* The target port might emit labels in the output function for
2016 some insn, e.g. sh.c output_branchy_insn. */
2017 if (CODE_LABEL_NUMBER (insn) <= max_labelno)
2019 int align = LABEL_TO_ALIGNMENT (insn);
2020 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
2021 int max_skip = LABEL_TO_MAX_SKIP (insn);
2024 if (align && NEXT_INSN (insn))
2026 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
2027 ASM_OUTPUT_MAX_SKIP_ALIGN (file, align, max_skip);
2029 #ifdef ASM_OUTPUT_ALIGN_WITH_NOP
2030 ASM_OUTPUT_ALIGN_WITH_NOP (file, align);
2032 ASM_OUTPUT_ALIGN (file, align);
2041 if (LABEL_NAME (insn))
2042 (*debug_hooks->label) (insn);
2046 next = next_nonnote_insn (insn);
2047 /* If this label is followed by a jump-table, make sure we put
2048 the label in the read-only section. Also possibly write the
2049 label and jump table together. */
2050 if (next != 0 && JUMP_TABLE_DATA_P (next))
2052 #if defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC)
2053 /* In this case, the case vector is being moved by the
2054 target, so don't output the label at all. Leave that
2055 to the back end macros. */
2057 if (! JUMP_TABLES_IN_TEXT_SECTION)
2061 switch_to_section (targetm.asm_out.function_rodata_section
2062 (current_function_decl));
2064 #ifdef ADDR_VEC_ALIGN
2065 log_align = ADDR_VEC_ALIGN (next);
2067 log_align = exact_log2 (BIGGEST_ALIGNMENT / BITS_PER_UNIT);
2069 ASM_OUTPUT_ALIGN (file, log_align);
2072 switch_to_section (current_function_section ());
2074 #ifdef ASM_OUTPUT_CASE_LABEL
2075 ASM_OUTPUT_CASE_LABEL (file, "L", CODE_LABEL_NUMBER (insn),
2078 targetm.asm_out.internal_label (file, "L", CODE_LABEL_NUMBER (insn));
2083 if (LABEL_ALT_ENTRY_P (insn))
2084 output_alternate_entry_point (file, insn);
2086 targetm.asm_out.internal_label (file, "L", CODE_LABEL_NUMBER (insn));
2091 rtx body = PATTERN (insn);
2092 int insn_code_number;
2096 #ifdef HAVE_conditional_execution
2097 /* Reset this early so it is correct for ASM statements. */
2098 current_insn_predicate = NULL_RTX;
2100 /* An INSN, JUMP_INSN or CALL_INSN.
2101 First check for special kinds that recog doesn't recognize. */
2103 if (GET_CODE (body) == USE /* These are just declarations. */
2104 || GET_CODE (body) == CLOBBER)
2109 /* If there is a REG_CC_SETTER note on this insn, it means that
2110 the setting of the condition code was done in the delay slot
2111 of the insn that branched here. So recover the cc status
2112 from the insn that set it. */
2114 rtx note = find_reg_note (insn, REG_CC_SETTER, NULL_RTX);
2117 NOTICE_UPDATE_CC (PATTERN (XEXP (note, 0)), XEXP (note, 0));
2118 cc_prev_status = cc_status;
2123 /* Detect insns that are really jump-tables
2124 and output them as such. */
2126 if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
2128 #if !(defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC))
2132 if (! JUMP_TABLES_IN_TEXT_SECTION)
2133 switch_to_section (targetm.asm_out.function_rodata_section
2134 (current_function_decl));
2136 switch_to_section (current_function_section ());
2140 #if defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC)
2141 if (GET_CODE (body) == ADDR_VEC)
2143 #ifdef ASM_OUTPUT_ADDR_VEC
2144 ASM_OUTPUT_ADDR_VEC (PREV_INSN (insn), body);
2151 #ifdef ASM_OUTPUT_ADDR_DIFF_VEC
2152 ASM_OUTPUT_ADDR_DIFF_VEC (PREV_INSN (insn), body);
2158 vlen = XVECLEN (body, GET_CODE (body) == ADDR_DIFF_VEC);
2159 for (idx = 0; idx < vlen; idx++)
2161 if (GET_CODE (body) == ADDR_VEC)
2163 #ifdef ASM_OUTPUT_ADDR_VEC_ELT
2164 ASM_OUTPUT_ADDR_VEC_ELT
2165 (file, CODE_LABEL_NUMBER (XEXP (XVECEXP (body, 0, idx), 0)));
2172 #ifdef ASM_OUTPUT_ADDR_DIFF_ELT
2173 ASM_OUTPUT_ADDR_DIFF_ELT
2176 CODE_LABEL_NUMBER (XEXP (XVECEXP (body, 1, idx), 0)),
2177 CODE_LABEL_NUMBER (XEXP (XEXP (body, 0), 0)));
2183 #ifdef ASM_OUTPUT_CASE_END
2184 ASM_OUTPUT_CASE_END (file,
2185 CODE_LABEL_NUMBER (PREV_INSN (insn)),
2190 switch_to_section (current_function_section ());
2194 /* Output this line note if it is the first or the last line
2196 if (notice_source_line (insn, &is_stmt))
2198 (*debug_hooks->source_line) (last_linenum,
2204 if (GET_CODE (body) == ASM_INPUT)
2206 const char *string = XSTR (body, 0);
2208 /* There's no telling what that did to the condition codes. */
2213 expanded_location loc;
2216 loc = expand_location (ASM_INPUT_SOURCE_LOCATION (body));
2217 if (*loc.file && loc.line)
2218 fprintf (asm_out_file, "%s %i \"%s\" 1\n",
2219 ASM_COMMENT_START, loc.line, loc.file);
2220 fprintf (asm_out_file, "\t%s\n", string);
2221 #if HAVE_AS_LINE_ZERO
2222 if (*loc.file && loc.line)
2223 fprintf (asm_out_file, "%s 0 \"\" 2\n", ASM_COMMENT_START);
2229 /* Detect `asm' construct with operands. */
2230 if (asm_noperands (body) >= 0)
2232 unsigned int noperands = asm_noperands (body);
2233 rtx *ops = XALLOCAVEC (rtx, noperands);
2236 expanded_location expanded;
2238 /* There's no telling what that did to the condition codes. */
2241 /* Get out the operand values. */
2242 string = decode_asm_operands (body, ops, NULL, NULL, NULL, &loc);
2243 /* Inhibit dying on what would otherwise be compiler bugs. */
2244 insn_noperands = noperands;
2245 this_is_asm_operands = insn;
2246 expanded = expand_location (loc);
2248 #ifdef FINAL_PRESCAN_INSN
2249 FINAL_PRESCAN_INSN (insn, ops, insn_noperands);
2252 /* Output the insn using them. */
2256 if (expanded.file && expanded.line)
2257 fprintf (asm_out_file, "%s %i \"%s\" 1\n",
2258 ASM_COMMENT_START, expanded.line, expanded.file);
2259 output_asm_insn (string, ops);
2260 #if HAVE_AS_LINE_ZERO
2261 if (expanded.file && expanded.line)
2262 fprintf (asm_out_file, "%s 0 \"\" 2\n", ASM_COMMENT_START);
2266 if (targetm.asm_out.final_postscan_insn)
2267 targetm.asm_out.final_postscan_insn (file, insn, ops,
2270 this_is_asm_operands = 0;
2276 if (GET_CODE (body) == SEQUENCE)
2278 /* A delayed-branch sequence */
2281 final_sequence = body;
2283 /* Record the delay slots' frame information before the branch.
2284 This is needed for delayed calls: see execute_cfa_program(). */
2285 #if defined (DWARF2_UNWIND_INFO)
2286 if (dwarf2out_do_frame ())
2287 for (i = 1; i < XVECLEN (body, 0); i++)
2288 dwarf2out_frame_debug (XVECEXP (body, 0, i), false);
2291 /* The first insn in this SEQUENCE might be a JUMP_INSN that will
2292 force the restoration of a comparison that was previously
2293 thought unnecessary. If that happens, cancel this sequence
2294 and cause that insn to be restored. */
2296 next = final_scan_insn (XVECEXP (body, 0, 0), file, 0, 1, seen);
2297 if (next != XVECEXP (body, 0, 1))
2303 for (i = 1; i < XVECLEN (body, 0); i++)
2305 rtx insn = XVECEXP (body, 0, i);
2306 rtx next = NEXT_INSN (insn);
2307 /* We loop in case any instruction in a delay slot gets
2310 insn = final_scan_insn (insn, file, 0, 1, seen);
2311 while (insn != next);
2313 #ifdef DBR_OUTPUT_SEQEND
2314 DBR_OUTPUT_SEQEND (file);
2318 /* If the insn requiring the delay slot was a CALL_INSN, the
2319 insns in the delay slot are actually executed before the
2320 called function. Hence we don't preserve any CC-setting
2321 actions in these insns and the CC must be marked as being
2322 clobbered by the function. */
2323 if (CALL_P (XVECEXP (body, 0, 0)))
2330 /* We have a real machine instruction as rtl. */
2332 body = PATTERN (insn);
2335 set = single_set (insn);
2337 /* Check for redundant test and compare instructions
2338 (when the condition codes are already set up as desired).
2339 This is done only when optimizing; if not optimizing,
2340 it should be possible for the user to alter a variable
2341 with the debugger in between statements
2342 and the next statement should reexamine the variable
2343 to compute the condition codes. */
2348 && GET_CODE (SET_DEST (set)) == CC0
2349 && insn != last_ignored_compare)
2352 if (GET_CODE (SET_SRC (set)) == SUBREG)
2353 SET_SRC (set) = alter_subreg (&SET_SRC (set));
2355 src1 = SET_SRC (set);
2357 if (GET_CODE (SET_SRC (set)) == COMPARE)
2359 if (GET_CODE (XEXP (SET_SRC (set), 0)) == SUBREG)
2360 XEXP (SET_SRC (set), 0)
2361 = alter_subreg (&XEXP (SET_SRC (set), 0));
2362 if (GET_CODE (XEXP (SET_SRC (set), 1)) == SUBREG)
2363 XEXP (SET_SRC (set), 1)
2364 = alter_subreg (&XEXP (SET_SRC (set), 1));
2365 if (XEXP (SET_SRC (set), 1)
2366 == CONST0_RTX (GET_MODE (XEXP (SET_SRC (set), 0))))
2367 src2 = XEXP (SET_SRC (set), 0);
2369 if ((cc_status.value1 != 0
2370 && rtx_equal_p (src1, cc_status.value1))
2371 || (cc_status.value2 != 0
2372 && rtx_equal_p (src1, cc_status.value2))
2373 || (src2 != 0 && cc_status.value1 != 0
2374 && rtx_equal_p (src2, cc_status.value1))
2375 || (src2 != 0 && cc_status.value2 != 0
2376 && rtx_equal_p (src2, cc_status.value2)))
2378 /* Don't delete insn if it has an addressing side-effect. */
2379 if (! FIND_REG_INC_NOTE (insn, NULL_RTX)
2380 /* or if anything in it is volatile. */
2381 && ! volatile_refs_p (PATTERN (insn)))
2383 /* We don't really delete the insn; just ignore it. */
2384 last_ignored_compare = insn;
2391 /* If this is a conditional branch, maybe modify it
2392 if the cc's are in a nonstandard state
2393 so that it accomplishes the same thing that it would
2394 do straightforwardly if the cc's were set up normally. */
2396 if (cc_status.flags != 0
2398 && GET_CODE (body) == SET
2399 && SET_DEST (body) == pc_rtx
2400 && GET_CODE (SET_SRC (body)) == IF_THEN_ELSE
2401 && COMPARISON_P (XEXP (SET_SRC (body), 0))
2402 && XEXP (XEXP (SET_SRC (body), 0), 0) == cc0_rtx)
2404 /* This function may alter the contents of its argument
2405 and clear some of the cc_status.flags bits.
2406 It may also return 1 meaning condition now always true
2407 or -1 meaning condition now always false
2408 or 2 meaning condition nontrivial but altered. */
2409 int result = alter_cond (XEXP (SET_SRC (body), 0));
2410 /* If condition now has fixed value, replace the IF_THEN_ELSE
2411 with its then-operand or its else-operand. */
2413 SET_SRC (body) = XEXP (SET_SRC (body), 1);
2415 SET_SRC (body) = XEXP (SET_SRC (body), 2);
2417 /* The jump is now either unconditional or a no-op.
2418 If it has become a no-op, don't try to output it.
2419 (It would not be recognized.) */
2420 if (SET_SRC (body) == pc_rtx)
2425 else if (GET_CODE (SET_SRC (body)) == RETURN)
2426 /* Replace (set (pc) (return)) with (return). */
2427 PATTERN (insn) = body = SET_SRC (body);
2429 /* Rerecognize the instruction if it has changed. */
2431 INSN_CODE (insn) = -1;
2434 /* If this is a conditional trap, maybe modify it if the cc's
2435 are in a nonstandard state so that it accomplishes the same
2436 thing that it would do straightforwardly if the cc's were
2438 if (cc_status.flags != 0
2439 && NONJUMP_INSN_P (insn)
2440 && GET_CODE (body) == TRAP_IF
2441 && COMPARISON_P (TRAP_CONDITION (body))
2442 && XEXP (TRAP_CONDITION (body), 0) == cc0_rtx)
2444 /* This function may alter the contents of its argument
2445 and clear some of the cc_status.flags bits.
2446 It may also return 1 meaning condition now always true
2447 or -1 meaning condition now always false
2448 or 2 meaning condition nontrivial but altered. */
2449 int result = alter_cond (TRAP_CONDITION (body));
2451 /* If TRAP_CONDITION has become always false, delete the
2459 /* If TRAP_CONDITION has become always true, replace
2460 TRAP_CONDITION with const_true_rtx. */
2462 TRAP_CONDITION (body) = const_true_rtx;
2464 /* Rerecognize the instruction if it has changed. */
2466 INSN_CODE (insn) = -1;
2469 /* Make same adjustments to instructions that examine the
2470 condition codes without jumping and instructions that
2471 handle conditional moves (if this machine has either one). */
2473 if (cc_status.flags != 0
2476 rtx cond_rtx, then_rtx, else_rtx;
2479 && GET_CODE (SET_SRC (set)) == IF_THEN_ELSE)
2481 cond_rtx = XEXP (SET_SRC (set), 0);
2482 then_rtx = XEXP (SET_SRC (set), 1);
2483 else_rtx = XEXP (SET_SRC (set), 2);
2487 cond_rtx = SET_SRC (set);
2488 then_rtx = const_true_rtx;
2489 else_rtx = const0_rtx;
2492 switch (GET_CODE (cond_rtx))
2506 if (XEXP (cond_rtx, 0) != cc0_rtx)
2508 result = alter_cond (cond_rtx);
2510 validate_change (insn, &SET_SRC (set), then_rtx, 0);
2511 else if (result == -1)
2512 validate_change (insn, &SET_SRC (set), else_rtx, 0);
2513 else if (result == 2)
2514 INSN_CODE (insn) = -1;
2515 if (SET_DEST (set) == SET_SRC (set))
2527 #ifdef HAVE_peephole
2528 /* Do machine-specific peephole optimizations if desired. */
2530 if (optimize && !flag_no_peephole && !nopeepholes)
2532 rtx next = peephole (insn);
2533 /* When peepholing, if there were notes within the peephole,
2534 emit them before the peephole. */
2535 if (next != 0 && next != NEXT_INSN (insn))
2537 rtx note, prev = PREV_INSN (insn);
2539 for (note = NEXT_INSN (insn); note != next;
2540 note = NEXT_INSN (note))
2541 final_scan_insn (note, file, optimize, nopeepholes, seen);
2543 /* Put the notes in the proper position for a later
2544 rescan. For example, the SH target can do this
2545 when generating a far jump in a delayed branch
2547 note = NEXT_INSN (insn);
2548 PREV_INSN (note) = prev;
2549 NEXT_INSN (prev) = note;
2550 NEXT_INSN (PREV_INSN (next)) = insn;
2551 PREV_INSN (insn) = PREV_INSN (next);
2552 NEXT_INSN (insn) = next;
2553 PREV_INSN (next) = insn;
2556 /* PEEPHOLE might have changed this. */
2557 body = PATTERN (insn);
2561 /* Try to recognize the instruction.
2562 If successful, verify that the operands satisfy the
2563 constraints for the instruction. Crash if they don't,
2564 since `reload' should have changed them so that they do. */
2566 insn_code_number = recog_memoized (insn);
2567 cleanup_subreg_operands (insn);
2569 /* Dump the insn in the assembly for debugging. */
2570 if (flag_dump_rtl_in_asm)
2572 print_rtx_head = ASM_COMMENT_START;
2573 print_rtl_single (asm_out_file, insn);
2574 print_rtx_head = "";
2577 if (! constrain_operands_cached (1))
2578 fatal_insn_not_found (insn);
2580 /* Some target machines need to prescan each insn before
2583 #ifdef FINAL_PRESCAN_INSN
2584 FINAL_PRESCAN_INSN (insn, recog_data.operand, recog_data.n_operands);
2587 #ifdef HAVE_conditional_execution
2588 if (GET_CODE (PATTERN (insn)) == COND_EXEC)
2589 current_insn_predicate = COND_EXEC_TEST (PATTERN (insn));
2593 cc_prev_status = cc_status;
2595 /* Update `cc_status' for this instruction.
2596 The instruction's output routine may change it further.
2597 If the output routine for a jump insn needs to depend
2598 on the cc status, it should look at cc_prev_status. */
2600 NOTICE_UPDATE_CC (body, insn);
2603 current_output_insn = debug_insn = insn;
2605 #if defined (DWARF2_UNWIND_INFO)
2606 if (CALL_P (insn) && dwarf2out_do_frame ())
2607 dwarf2out_frame_debug (insn, false);
2610 /* Find the proper template for this insn. */
2611 templ = get_insn_template (insn_code_number, insn);
2613 /* If the C code returns 0, it means that it is a jump insn
2614 which follows a deleted test insn, and that test insn
2615 needs to be reinserted. */
2620 gcc_assert (prev_nonnote_insn (insn) == last_ignored_compare);
2622 /* We have already processed the notes between the setter and
2623 the user. Make sure we don't process them again, this is
2624 particularly important if one of the notes is a block
2625 scope note or an EH note. */
2627 prev != last_ignored_compare;
2628 prev = PREV_INSN (prev))
2631 delete_insn (prev); /* Use delete_note. */
2637 /* If the template is the string "#", it means that this insn must
2639 if (templ[0] == '#' && templ[1] == '\0')
2641 rtx new_rtx = try_split (body, insn, 0);
2643 /* If we didn't split the insn, go away. */
2644 if (new_rtx == insn && PATTERN (new_rtx) == body)
2645 fatal_insn ("could not split insn", insn);
2647 #ifdef HAVE_ATTR_length
2648 /* This instruction should have been split in shorten_branches,
2649 to ensure that we would have valid length info for the
2657 #ifdef TARGET_UNWIND_INFO
2658 /* ??? This will put the directives in the wrong place if
2659 get_insn_template outputs assembly directly. However calling it
2660 before get_insn_template breaks if the insns is split. */
2661 targetm.asm_out.unwind_emit (asm_out_file, insn);
2666 rtx x = call_from_call_insn (insn);
2668 if (x && MEM_P (x) && GET_CODE (XEXP (x, 0)) == SYMBOL_REF)
2672 t = SYMBOL_REF_DECL (x);
2674 assemble_external (t);
2678 /* Output assembler code from the template. */
2679 output_asm_insn (templ, recog_data.operand);
2681 /* Some target machines need to postscan each insn after
2683 if (targetm.asm_out.final_postscan_insn)
2684 targetm.asm_out.final_postscan_insn (file, insn, recog_data.operand,
2685 recog_data.n_operands);
2687 /* If necessary, report the effect that the instruction has on
2688 the unwind info. We've already done this for delay slots
2689 and call instructions. */
2690 #if defined (DWARF2_UNWIND_INFO)
2691 if (final_sequence == 0
2692 #if !defined (HAVE_prologue)
2693 && !ACCUMULATE_OUTGOING_ARGS
2695 && dwarf2out_do_frame ())
2696 dwarf2out_frame_debug (insn, true);
2699 current_output_insn = debug_insn = 0;
2702 return NEXT_INSN (insn);
2705 /* Return whether a source line note needs to be emitted before INSN.
2706 Sets IS_STMT to TRUE if the line should be marked as a possible
2707 breakpoint location. */
2710 notice_source_line (rtx insn, bool *is_stmt)
2712 const char *filename;
2715 if (override_filename)
2717 filename = override_filename;
2718 linenum = override_linenum;
2722 filename = insn_file (insn);
2723 linenum = insn_line (insn);
2726 if (filename == NULL)
2729 if (force_source_line
2730 || filename != last_filename
2731 || last_linenum != linenum)
2733 force_source_line = false;
2734 last_filename = filename;
2735 last_linenum = linenum;
2736 last_discriminator = discriminator;
2738 high_block_linenum = MAX (last_linenum, high_block_linenum);
2739 high_function_linenum = MAX (last_linenum, high_function_linenum);
2743 if (SUPPORTS_DISCRIMINATOR && last_discriminator != discriminator)
2745 /* If the discriminator changed, but the line number did not,
2746 output the line table entry with is_stmt false so the
2747 debugger does not treat this as a breakpoint location. */
2748 last_discriminator = discriminator;
2756 /* For each operand in INSN, simplify (subreg (reg)) so that it refers
2757 directly to the desired hard register. */
2760 cleanup_subreg_operands (rtx insn)
2763 bool changed = false;
2764 extract_insn_cached (insn);
2765 for (i = 0; i < recog_data.n_operands; i++)
2767 /* The following test cannot use recog_data.operand when testing
2768 for a SUBREG: the underlying object might have been changed
2769 already if we are inside a match_operator expression that
2770 matches the else clause. Instead we test the underlying
2771 expression directly. */
2772 if (GET_CODE (*recog_data.operand_loc[i]) == SUBREG)
2774 recog_data.operand[i] = alter_subreg (recog_data.operand_loc[i]);
2777 else if (GET_CODE (recog_data.operand[i]) == PLUS
2778 || GET_CODE (recog_data.operand[i]) == MULT
2779 || MEM_P (recog_data.operand[i]))
2780 recog_data.operand[i] = walk_alter_subreg (recog_data.operand_loc[i], &changed);
2783 for (i = 0; i < recog_data.n_dups; i++)
2785 if (GET_CODE (*recog_data.dup_loc[i]) == SUBREG)
2787 *recog_data.dup_loc[i] = alter_subreg (recog_data.dup_loc[i]);
2790 else if (GET_CODE (*recog_data.dup_loc[i]) == PLUS
2791 || GET_CODE (*recog_data.dup_loc[i]) == MULT
2792 || MEM_P (*recog_data.dup_loc[i]))
2793 *recog_data.dup_loc[i] = walk_alter_subreg (recog_data.dup_loc[i], &changed);
2796 df_insn_rescan (insn);
2799 /* If X is a SUBREG, replace it with a REG or a MEM,
2800 based on the thing it is a subreg of. */
2803 alter_subreg (rtx *xp)
2806 rtx y = SUBREG_REG (x);
2808 /* simplify_subreg does not remove subreg from volatile references.
2809 We are required to. */
2812 int offset = SUBREG_BYTE (x);
2814 /* For paradoxical subregs on big-endian machines, SUBREG_BYTE
2815 contains 0 instead of the proper offset. See simplify_subreg. */
2817 && GET_MODE_SIZE (GET_MODE (y)) < GET_MODE_SIZE (GET_MODE (x)))
2819 int difference = GET_MODE_SIZE (GET_MODE (y))
2820 - GET_MODE_SIZE (GET_MODE (x));
2821 if (WORDS_BIG_ENDIAN)
2822 offset += (difference / UNITS_PER_WORD) * UNITS_PER_WORD;
2823 if (BYTES_BIG_ENDIAN)
2824 offset += difference % UNITS_PER_WORD;
2827 *xp = adjust_address (y, GET_MODE (x), offset);
2831 rtx new_rtx = simplify_subreg (GET_MODE (x), y, GET_MODE (y),
2838 /* Simplify_subreg can't handle some REG cases, but we have to. */
2840 HOST_WIDE_INT offset;
2842 regno = subreg_regno (x);
2843 if (subreg_lowpart_p (x))
2844 offset = byte_lowpart_offset (GET_MODE (x), GET_MODE (y));
2846 offset = SUBREG_BYTE (x);
2847 *xp = gen_rtx_REG_offset (y, GET_MODE (x), regno, offset);
2854 /* Do alter_subreg on all the SUBREGs contained in X. */
2857 walk_alter_subreg (rtx *xp, bool *changed)
2860 switch (GET_CODE (x))
2865 XEXP (x, 0) = walk_alter_subreg (&XEXP (x, 0), changed);
2866 XEXP (x, 1) = walk_alter_subreg (&XEXP (x, 1), changed);
2871 XEXP (x, 0) = walk_alter_subreg (&XEXP (x, 0), changed);
2876 return alter_subreg (xp);
2887 /* Given BODY, the body of a jump instruction, alter the jump condition
2888 as required by the bits that are set in cc_status.flags.
2889 Not all of the bits there can be handled at this level in all cases.
2891 The value is normally 0.
2892 1 means that the condition has become always true.
2893 -1 means that the condition has become always false.
2894 2 means that COND has been altered. */
2897 alter_cond (rtx cond)
2901 if (cc_status.flags & CC_REVERSED)
2904 PUT_CODE (cond, swap_condition (GET_CODE (cond)));
2907 if (cc_status.flags & CC_INVERTED)
2910 PUT_CODE (cond, reverse_condition (GET_CODE (cond)));
2913 if (cc_status.flags & CC_NOT_POSITIVE)
2914 switch (GET_CODE (cond))
2919 /* Jump becomes unconditional. */
2925 /* Jump becomes no-op. */
2929 PUT_CODE (cond, EQ);
2934 PUT_CODE (cond, NE);
2942 if (cc_status.flags & CC_NOT_NEGATIVE)
2943 switch (GET_CODE (cond))
2947 /* Jump becomes unconditional. */
2952 /* Jump becomes no-op. */
2957 PUT_CODE (cond, EQ);
2963 PUT_CODE (cond, NE);
2971 if (cc_status.flags & CC_NO_OVERFLOW)
2972 switch (GET_CODE (cond))
2975 /* Jump becomes unconditional. */
2979 PUT_CODE (cond, EQ);
2984 PUT_CODE (cond, NE);
2989 /* Jump becomes no-op. */
2996 if (cc_status.flags & (CC_Z_IN_NOT_N | CC_Z_IN_N))
2997 switch (GET_CODE (cond))
3003 PUT_CODE (cond, cc_status.flags & CC_Z_IN_N ? GE : LT);
3008 PUT_CODE (cond, cc_status.flags & CC_Z_IN_N ? LT : GE);
3013 if (cc_status.flags & CC_NOT_SIGNED)
3014 /* The flags are valid if signed condition operators are converted
3016 switch (GET_CODE (cond))
3019 PUT_CODE (cond, LEU);
3024 PUT_CODE (cond, LTU);
3029 PUT_CODE (cond, GTU);
3034 PUT_CODE (cond, GEU);
3046 /* Report inconsistency between the assembler template and the operands.
3047 In an `asm', it's the user's fault; otherwise, the compiler's fault. */
3050 output_operand_lossage (const char *cmsgid, ...)
3054 const char *pfx_str;
3057 va_start (ap, cmsgid);
3059 pfx_str = this_is_asm_operands ? _("invalid 'asm': ") : "output_operand: ";
3060 asprintf (&fmt_string, "%s%s", pfx_str, _(cmsgid));
3061 vasprintf (&new_message, fmt_string, ap);
3063 if (this_is_asm_operands)
3064 error_for_asm (this_is_asm_operands, "%s", new_message);
3066 internal_error ("%s", new_message);
3073 /* Output of assembler code from a template, and its subroutines. */
3075 /* Annotate the assembly with a comment describing the pattern and
3076 alternative used. */
3079 output_asm_name (void)
3083 int num = INSN_CODE (debug_insn);
3084 fprintf (asm_out_file, "\t%s %d\t%s",
3085 ASM_COMMENT_START, INSN_UID (debug_insn),
3086 insn_data[num].name);
3087 if (insn_data[num].n_alternatives > 1)
3088 fprintf (asm_out_file, "/%d", which_alternative + 1);
3089 #ifdef HAVE_ATTR_length
3090 fprintf (asm_out_file, "\t[length = %d]",
3091 get_attr_length (debug_insn));
3093 /* Clear this so only the first assembler insn
3094 of any rtl insn will get the special comment for -dp. */
3099 /* If OP is a REG or MEM and we can find a MEM_EXPR corresponding to it
3100 or its address, return that expr . Set *PADDRESSP to 1 if the expr
3101 corresponds to the address of the object and 0 if to the object. */
3104 get_mem_expr_from_op (rtx op, int *paddressp)
3112 return REG_EXPR (op);
3113 else if (!MEM_P (op))
3116 if (MEM_EXPR (op) != 0)
3117 return MEM_EXPR (op);
3119 /* Otherwise we have an address, so indicate it and look at the address. */
3123 /* First check if we have a decl for the address, then look at the right side
3124 if it is a PLUS. Otherwise, strip off arithmetic and keep looking.
3125 But don't allow the address to itself be indirect. */
3126 if ((expr = get_mem_expr_from_op (op, &inner_addressp)) && ! inner_addressp)
3128 else if (GET_CODE (op) == PLUS
3129 && (expr = get_mem_expr_from_op (XEXP (op, 1), &inner_addressp)))
3133 || GET_RTX_CLASS (GET_CODE (op)) == RTX_BIN_ARITH)
3136 expr = get_mem_expr_from_op (op, &inner_addressp);
3137 return inner_addressp ? 0 : expr;
3140 /* Output operand names for assembler instructions. OPERANDS is the
3141 operand vector, OPORDER is the order to write the operands, and NOPS
3142 is the number of operands to write. */
3145 output_asm_operand_names (rtx *operands, int *oporder, int nops)
3150 for (i = 0; i < nops; i++)
3153 rtx op = operands[oporder[i]];
3154 tree expr = get_mem_expr_from_op (op, &addressp);
3156 fprintf (asm_out_file, "%c%s",
3157 wrote ? ',' : '\t', wrote ? "" : ASM_COMMENT_START);
3161 fprintf (asm_out_file, "%s",
3162 addressp ? "*" : "");
3163 print_mem_expr (asm_out_file, expr);
3166 else if (REG_P (op) && ORIGINAL_REGNO (op)
3167 && ORIGINAL_REGNO (op) != REGNO (op))
3168 fprintf (asm_out_file, " tmp%i", ORIGINAL_REGNO (op));
3172 /* Output text from TEMPLATE to the assembler output file,
3173 obeying %-directions to substitute operands taken from
3174 the vector OPERANDS.
3176 %N (for N a digit) means print operand N in usual manner.
3177 %lN means require operand N to be a CODE_LABEL or LABEL_REF
3178 and print the label name with no punctuation.
3179 %cN means require operand N to be a constant
3180 and print the constant expression with no punctuation.
3181 %aN means expect operand N to be a memory address
3182 (not a memory reference!) and print a reference
3184 %nN means expect operand N to be a constant
3185 and print a constant expression for minus the value
3186 of the operand, with no other punctuation. */
3189 output_asm_insn (const char *templ, rtx *operands)
3193 #ifdef ASSEMBLER_DIALECT
3196 int oporder[MAX_RECOG_OPERANDS];
3197 char opoutput[MAX_RECOG_OPERANDS];
3200 /* An insn may return a null string template
3201 in a case where no assembler code is needed. */
3205 memset (opoutput, 0, sizeof opoutput);
3207 putc ('\t', asm_out_file);
3209 #ifdef ASM_OUTPUT_OPCODE
3210 ASM_OUTPUT_OPCODE (asm_out_file, p);
3217 if (flag_verbose_asm)
3218 output_asm_operand_names (operands, oporder, ops);
3219 if (flag_print_asm_name)
3223 memset (opoutput, 0, sizeof opoutput);
3225 putc (c, asm_out_file);
3226 #ifdef ASM_OUTPUT_OPCODE
3227 while ((c = *p) == '\t')
3229 putc (c, asm_out_file);
3232 ASM_OUTPUT_OPCODE (asm_out_file, p);
3236 #ifdef ASSEMBLER_DIALECT
3242 output_operand_lossage ("nested assembly dialect alternatives");
3246 /* If we want the first dialect, do nothing. Otherwise, skip
3247 DIALECT_NUMBER of strings ending with '|'. */
3248 for (i = 0; i < dialect_number; i++)
3250 while (*p && *p != '}' && *p++ != '|')
3259 output_operand_lossage ("unterminated assembly dialect alternative");
3266 /* Skip to close brace. */
3271 output_operand_lossage ("unterminated assembly dialect alternative");
3275 while (*p++ != '}');
3279 putc (c, asm_out_file);
3284 putc (c, asm_out_file);
3290 /* %% outputs a single %. */
3294 putc (c, asm_out_file);
3296 /* %= outputs a number which is unique to each insn in the entire
3297 compilation. This is useful for making local labels that are
3298 referred to more than once in a given insn. */
3302 fprintf (asm_out_file, "%d", insn_counter);
3304 /* % followed by a letter and some digits
3305 outputs an operand in a special way depending on the letter.
3306 Letters `acln' are implemented directly.
3307 Other letters are passed to `output_operand' so that
3308 the PRINT_OPERAND macro can define them. */
3309 else if (ISALPHA (*p))
3312 unsigned long opnum;
3315 opnum = strtoul (p, &endptr, 10);
3318 output_operand_lossage ("operand number missing "
3320 else if (this_is_asm_operands && opnum >= insn_noperands)
3321 output_operand_lossage ("operand number out of range");
3322 else if (letter == 'l')
3323 output_asm_label (operands[opnum]);
3324 else if (letter == 'a')
3325 output_address (operands[opnum]);
3326 else if (letter == 'c')
3328 if (CONSTANT_ADDRESS_P (operands[opnum]))
3329 output_addr_const (asm_out_file, operands[opnum]);
3331 output_operand (operands[opnum], 'c');
3333 else if (letter == 'n')
3335 if (CONST_INT_P (operands[opnum]))
3336 fprintf (asm_out_file, HOST_WIDE_INT_PRINT_DEC,
3337 - INTVAL (operands[opnum]));
3340 putc ('-', asm_out_file);
3341 output_addr_const (asm_out_file, operands[opnum]);
3345 output_operand (operands[opnum], letter);
3347 if (!opoutput[opnum])
3348 oporder[ops++] = opnum;
3349 opoutput[opnum] = 1;
3354 /* % followed by a digit outputs an operand the default way. */
3355 else if (ISDIGIT (*p))
3357 unsigned long opnum;
3360 opnum = strtoul (p, &endptr, 10);
3361 if (this_is_asm_operands && opnum >= insn_noperands)
3362 output_operand_lossage ("operand number out of range");
3364 output_operand (operands[opnum], 0);
3366 if (!opoutput[opnum])
3367 oporder[ops++] = opnum;
3368 opoutput[opnum] = 1;
3373 /* % followed by punctuation: output something for that
3374 punctuation character alone, with no operand.
3375 The PRINT_OPERAND macro decides what is actually done. */
3376 #ifdef PRINT_OPERAND_PUNCT_VALID_P
3377 else if (PRINT_OPERAND_PUNCT_VALID_P ((unsigned char) *p))
3378 output_operand (NULL_RTX, *p++);
3381 output_operand_lossage ("invalid %%-code");
3385 putc (c, asm_out_file);
3388 /* Write out the variable names for operands, if we know them. */
3389 if (flag_verbose_asm)
3390 output_asm_operand_names (operands, oporder, ops);
3391 if (flag_print_asm_name)
3394 putc ('\n', asm_out_file);
3397 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
3400 output_asm_label (rtx x)
3404 if (GET_CODE (x) == LABEL_REF)
3408 && NOTE_KIND (x) == NOTE_INSN_DELETED_LABEL))
3409 ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x));
3411 output_operand_lossage ("'%%l' operand isn't a label");
3413 assemble_name (asm_out_file, buf);
3416 /* Helper rtx-iteration-function for mark_symbol_refs_as_used and
3417 output_operand. Marks SYMBOL_REFs as referenced through use of
3418 assemble_external. */
3421 mark_symbol_ref_as_used (rtx *xp, void *dummy ATTRIBUTE_UNUSED)
3425 /* If we have a used symbol, we may have to emit assembly
3426 annotations corresponding to whether the symbol is external, weak
3427 or has non-default visibility. */
3428 if (GET_CODE (x) == SYMBOL_REF)
3432 t = SYMBOL_REF_DECL (x);
3434 assemble_external (t);
3442 /* Marks SYMBOL_REFs in x as referenced through use of assemble_external. */
3445 mark_symbol_refs_as_used (rtx x)
3447 for_each_rtx (&x, mark_symbol_ref_as_used, NULL);
3450 /* Print operand X using machine-dependent assembler syntax.
3451 The macro PRINT_OPERAND is defined just to control this function.
3452 CODE is a non-digit that preceded the operand-number in the % spec,
3453 such as 'z' if the spec was `%z3'. CODE is 0 if there was no char
3454 between the % and the digits.
3455 When CODE is a non-letter, X is 0.
3457 The meanings of the letters are machine-dependent and controlled
3458 by PRINT_OPERAND. */
3461 output_operand (rtx x, int code ATTRIBUTE_UNUSED)
3463 if (x && GET_CODE (x) == SUBREG)
3464 x = alter_subreg (&x);
3466 /* X must not be a pseudo reg. */
3467 gcc_assert (!x || !REG_P (x) || REGNO (x) < FIRST_PSEUDO_REGISTER);
3469 PRINT_OPERAND (asm_out_file, x, code);
3474 for_each_rtx (&x, mark_symbol_ref_as_used, NULL);
3477 /* Print a memory reference operand for address X
3478 using machine-dependent assembler syntax.
3479 The macro PRINT_OPERAND_ADDRESS exists just to control this function. */
3482 output_address (rtx x)
3484 bool changed = false;
3485 walk_alter_subreg (&x, &changed);
3486 PRINT_OPERAND_ADDRESS (asm_out_file, x);
3489 /* Print an integer constant expression in assembler syntax.
3490 Addition and subtraction are the only arithmetic
3491 that may appear in these expressions. */
3494 output_addr_const (FILE *file, rtx x)
3499 switch (GET_CODE (x))
3506 if (SYMBOL_REF_DECL (x))
3508 mark_decl_referenced (SYMBOL_REF_DECL (x));
3509 assemble_external (SYMBOL_REF_DECL (x));
3511 #ifdef ASM_OUTPUT_SYMBOL_REF
3512 ASM_OUTPUT_SYMBOL_REF (file, x);
3514 assemble_name (file, XSTR (x, 0));
3522 ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x));
3523 #ifdef ASM_OUTPUT_LABEL_REF
3524 ASM_OUTPUT_LABEL_REF (file, buf);
3526 assemble_name (file, buf);
3531 fprintf (file, HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
3535 /* This used to output parentheses around the expression,
3536 but that does not work on the 386 (either ATT or BSD assembler). */
3537 output_addr_const (file, XEXP (x, 0));
3541 if (GET_MODE (x) == VOIDmode)
3543 /* We can use %d if the number is one word and positive. */
3544 if (CONST_DOUBLE_HIGH (x))
3545 fprintf (file, HOST_WIDE_INT_PRINT_DOUBLE_HEX,
3546 (unsigned HOST_WIDE_INT) CONST_DOUBLE_HIGH (x),
3547 (unsigned HOST_WIDE_INT) CONST_DOUBLE_LOW (x));
3548 else if (CONST_DOUBLE_LOW (x) < 0)
3549 fprintf (file, HOST_WIDE_INT_PRINT_HEX,
3550 (unsigned HOST_WIDE_INT) CONST_DOUBLE_LOW (x));
3552 fprintf (file, HOST_WIDE_INT_PRINT_DEC, CONST_DOUBLE_LOW (x));
3555 /* We can't handle floating point constants;
3556 PRINT_OPERAND must handle them. */
3557 output_operand_lossage ("floating constant misused");
3561 fprintf (file, HOST_WIDE_INT_PRINT_HEX,
3562 (unsigned HOST_WIDE_INT) CONST_FIXED_VALUE_LOW (x));
3566 /* Some assemblers need integer constants to appear last (eg masm). */
3567 if (CONST_INT_P (XEXP (x, 0)))
3569 output_addr_const (file, XEXP (x, 1));
3570 if (INTVAL (XEXP (x, 0)) >= 0)
3571 fprintf (file, "+");
3572 output_addr_const (file, XEXP (x, 0));
3576 output_addr_const (file, XEXP (x, 0));
3577 if (!CONST_INT_P (XEXP (x, 1))
3578 || INTVAL (XEXP (x, 1)) >= 0)
3579 fprintf (file, "+");
3580 output_addr_const (file, XEXP (x, 1));
3585 /* Avoid outputting things like x-x or x+5-x,
3586 since some assemblers can't handle that. */
3587 x = simplify_subtraction (x);
3588 if (GET_CODE (x) != MINUS)
3591 output_addr_const (file, XEXP (x, 0));
3592 fprintf (file, "-");
3593 if ((CONST_INT_P (XEXP (x, 1)) && INTVAL (XEXP (x, 1)) >= 0)
3594 || GET_CODE (XEXP (x, 1)) == PC
3595 || GET_CODE (XEXP (x, 1)) == SYMBOL_REF)
3596 output_addr_const (file, XEXP (x, 1));
3599 fputs (targetm.asm_out.open_paren, file);
3600 output_addr_const (file, XEXP (x, 1));
3601 fputs (targetm.asm_out.close_paren, file);
3609 output_addr_const (file, XEXP (x, 0));
3613 #ifdef OUTPUT_ADDR_CONST_EXTRA
3614 OUTPUT_ADDR_CONST_EXTRA (file, x, fail);
3619 output_operand_lossage ("invalid expression as operand");
3623 /* A poor man's fprintf, with the added features of %I, %R, %L, and %U.
3624 %R prints the value of REGISTER_PREFIX.
3625 %L prints the value of LOCAL_LABEL_PREFIX.
3626 %U prints the value of USER_LABEL_PREFIX.
3627 %I prints the value of IMMEDIATE_PREFIX.
3628 %O runs ASM_OUTPUT_OPCODE to transform what follows in the string.
3629 Also supported are %d, %i, %u, %x, %X, %o, %c, %s and %%.
3631 We handle alternate assembler dialects here, just like output_asm_insn. */
3634 asm_fprintf (FILE *file, const char *p, ...)
3640 va_start (argptr, p);
3647 #ifdef ASSEMBLER_DIALECT
3652 /* If we want the first dialect, do nothing. Otherwise, skip
3653 DIALECT_NUMBER of strings ending with '|'. */
3654 for (i = 0; i < dialect_number; i++)
3656 while (*p && *p++ != '|')
3666 /* Skip to close brace. */
3667 while (*p && *p++ != '}')
3678 while (strchr ("-+ #0", c))
3683 while (ISDIGIT (c) || c == '.')
3694 case 'd': case 'i': case 'u':
3695 case 'x': case 'X': case 'o':
3699 fprintf (file, buf, va_arg (argptr, int));
3703 /* This is a prefix to the 'd', 'i', 'u', 'x', 'X', and
3704 'o' cases, but we do not check for those cases. It
3705 means that the value is a HOST_WIDE_INT, which may be
3706 either `long' or `long long'. */
3707 memcpy (q, HOST_WIDE_INT_PRINT, strlen (HOST_WIDE_INT_PRINT));
3708 q += strlen (HOST_WIDE_INT_PRINT);
3711 fprintf (file, buf, va_arg (argptr, HOST_WIDE_INT));
3716 #ifdef HAVE_LONG_LONG
3722 fprintf (file, buf, va_arg (argptr, long long));
3729 fprintf (file, buf, va_arg (argptr, long));
3737 fprintf (file, buf, va_arg (argptr, char *));
3741 #ifdef ASM_OUTPUT_OPCODE
3742 ASM_OUTPUT_OPCODE (asm_out_file, p);
3747 #ifdef REGISTER_PREFIX
3748 fprintf (file, "%s", REGISTER_PREFIX);
3753 #ifdef IMMEDIATE_PREFIX
3754 fprintf (file, "%s", IMMEDIATE_PREFIX);
3759 #ifdef LOCAL_LABEL_PREFIX
3760 fprintf (file, "%s", LOCAL_LABEL_PREFIX);
3765 fputs (user_label_prefix, file);
3768 #ifdef ASM_FPRINTF_EXTENSIONS
3769 /* Uppercase letters are reserved for general use by asm_fprintf
3770 and so are not available to target specific code. In order to
3771 prevent the ASM_FPRINTF_EXTENSIONS macro from using them then,
3772 they are defined here. As they get turned into real extensions
3773 to asm_fprintf they should be removed from this list. */
3774 case 'A': case 'B': case 'C': case 'D': case 'E':
3775 case 'F': case 'G': case 'H': case 'J': case 'K':
3776 case 'M': case 'N': case 'P': case 'Q': case 'S':
3777 case 'T': case 'V': case 'W': case 'Y': case 'Z':
3780 ASM_FPRINTF_EXTENSIONS (file, argptr, p)
3793 /* Split up a CONST_DOUBLE or integer constant rtx
3794 into two rtx's for single words,
3795 storing in *FIRST the word that comes first in memory in the target
3796 and in *SECOND the other. */
3799 split_double (rtx value, rtx *first, rtx *second)
3801 if (CONST_INT_P (value))
3803 if (HOST_BITS_PER_WIDE_INT >= (2 * BITS_PER_WORD))
3805 /* In this case the CONST_INT holds both target words.
3806 Extract the bits from it into two word-sized pieces.
3807 Sign extend each half to HOST_WIDE_INT. */
3808 unsigned HOST_WIDE_INT low, high;
3809 unsigned HOST_WIDE_INT mask, sign_bit, sign_extend;
3811 /* Set sign_bit to the most significant bit of a word. */
3813 sign_bit <<= BITS_PER_WORD - 1;
3815 /* Set mask so that all bits of the word are set. We could
3816 have used 1 << BITS_PER_WORD instead of basing the
3817 calculation on sign_bit. However, on machines where
3818 HOST_BITS_PER_WIDE_INT == BITS_PER_WORD, it could cause a
3819 compiler warning, even though the code would never be
3821 mask = sign_bit << 1;
3824 /* Set sign_extend as any remaining bits. */
3825 sign_extend = ~mask;
3827 /* Pick the lower word and sign-extend it. */
3828 low = INTVAL (value);
3833 /* Pick the higher word, shifted to the least significant
3834 bits, and sign-extend it. */
3835 high = INTVAL (value);
3836 high >>= BITS_PER_WORD - 1;
3839 if (high & sign_bit)
3840 high |= sign_extend;
3842 /* Store the words in the target machine order. */
3843 if (WORDS_BIG_ENDIAN)
3845 *first = GEN_INT (high);
3846 *second = GEN_INT (low);
3850 *first = GEN_INT (low);
3851 *second = GEN_INT (high);
3856 /* The rule for using CONST_INT for a wider mode
3857 is that we regard the value as signed.
3858 So sign-extend it. */
3859 rtx high = (INTVAL (value) < 0 ? constm1_rtx : const0_rtx);
3860 if (WORDS_BIG_ENDIAN)
3872 else if (GET_CODE (value) != CONST_DOUBLE)
3874 if (WORDS_BIG_ENDIAN)
3876 *first = const0_rtx;
3882 *second = const0_rtx;
3885 else if (GET_MODE (value) == VOIDmode
3886 /* This is the old way we did CONST_DOUBLE integers. */
3887 || GET_MODE_CLASS (GET_MODE (value)) == MODE_INT)
3889 /* In an integer, the words are defined as most and least significant.
3890 So order them by the target's convention. */
3891 if (WORDS_BIG_ENDIAN)
3893 *first = GEN_INT (CONST_DOUBLE_HIGH (value));
3894 *second = GEN_INT (CONST_DOUBLE_LOW (value));
3898 *first = GEN_INT (CONST_DOUBLE_LOW (value));
3899 *second = GEN_INT (CONST_DOUBLE_HIGH (value));
3906 REAL_VALUE_FROM_CONST_DOUBLE (r, value);
3908 /* Note, this converts the REAL_VALUE_TYPE to the target's
3909 format, splits up the floating point double and outputs
3910 exactly 32 bits of it into each of l[0] and l[1] --
3911 not necessarily BITS_PER_WORD bits. */
3912 REAL_VALUE_TO_TARGET_DOUBLE (r, l);
3914 /* If 32 bits is an entire word for the target, but not for the host,
3915 then sign-extend on the host so that the number will look the same
3916 way on the host that it would on the target. See for instance
3917 simplify_unary_operation. The #if is needed to avoid compiler
3920 #if HOST_BITS_PER_LONG > 32
3921 if (BITS_PER_WORD < HOST_BITS_PER_LONG && BITS_PER_WORD == 32)
3923 if (l[0] & ((long) 1 << 31))
3924 l[0] |= ((long) (-1) << 32);
3925 if (l[1] & ((long) 1 << 31))
3926 l[1] |= ((long) (-1) << 32);
3930 *first = GEN_INT (l[0]);
3931 *second = GEN_INT (l[1]);
3935 /* Return nonzero if this function has no function calls. */
3938 leaf_function_p (void)
3943 if (crtl->profile || profile_arc_flag)
3946 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3949 && ! SIBLING_CALL_P (insn))
3951 if (NONJUMP_INSN_P (insn)
3952 && GET_CODE (PATTERN (insn)) == SEQUENCE
3953 && CALL_P (XVECEXP (PATTERN (insn), 0, 0))
3954 && ! SIBLING_CALL_P (XVECEXP (PATTERN (insn), 0, 0)))
3957 for (link = crtl->epilogue_delay_list;
3959 link = XEXP (link, 1))
3961 insn = XEXP (link, 0);
3964 && ! SIBLING_CALL_P (insn))
3966 if (NONJUMP_INSN_P (insn)
3967 && GET_CODE (PATTERN (insn)) == SEQUENCE
3968 && CALL_P (XVECEXP (PATTERN (insn), 0, 0))
3969 && ! SIBLING_CALL_P (XVECEXP (PATTERN (insn), 0, 0)))
3976 /* Return 1 if branch is a forward branch.
3977 Uses insn_shuid array, so it works only in the final pass. May be used by
3978 output templates to customary add branch prediction hints.
3981 final_forward_branch_p (rtx insn)
3983 int insn_id, label_id;
3985 gcc_assert (uid_shuid);
3986 insn_id = INSN_SHUID (insn);
3987 label_id = INSN_SHUID (JUMP_LABEL (insn));
3988 /* We've hit some insns that does not have id information available. */
3989 gcc_assert (insn_id && label_id);
3990 return insn_id < label_id;
3993 /* On some machines, a function with no call insns
3994 can run faster if it doesn't create its own register window.
3995 When output, the leaf function should use only the "output"
3996 registers. Ordinarily, the function would be compiled to use
3997 the "input" registers to find its arguments; it is a candidate
3998 for leaf treatment if it uses only the "input" registers.
3999 Leaf function treatment means renumbering so the function
4000 uses the "output" registers instead. */
4002 #ifdef LEAF_REGISTERS
4004 /* Return 1 if this function uses only the registers that can be
4005 safely renumbered. */
4008 only_leaf_regs_used (void)
4011 const char *const permitted_reg_in_leaf_functions = LEAF_REGISTERS;
4013 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
4014 if ((df_regs_ever_live_p (i) || global_regs[i])
4015 && ! permitted_reg_in_leaf_functions[i])
4018 if (crtl->uses_pic_offset_table
4019 && pic_offset_table_rtx != 0
4020 && REG_P (pic_offset_table_rtx)
4021 && ! permitted_reg_in_leaf_functions[REGNO (pic_offset_table_rtx)])
4027 /* Scan all instructions and renumber all registers into those
4028 available in leaf functions. */
4031 leaf_renumber_regs (rtx first)
4035 /* Renumber only the actual patterns.
4036 The reg-notes can contain frame pointer refs,
4037 and renumbering them could crash, and should not be needed. */
4038 for (insn = first; insn; insn = NEXT_INSN (insn))
4040 leaf_renumber_regs_insn (PATTERN (insn));
4041 for (insn = crtl->epilogue_delay_list;
4043 insn = XEXP (insn, 1))
4044 if (INSN_P (XEXP (insn, 0)))
4045 leaf_renumber_regs_insn (PATTERN (XEXP (insn, 0)));
4048 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
4049 available in leaf functions. */
4052 leaf_renumber_regs_insn (rtx in_rtx)
4055 const char *format_ptr;
4060 /* Renumber all input-registers into output-registers.
4061 renumbered_regs would be 1 for an output-register;
4068 /* Don't renumber the same reg twice. */
4072 newreg = REGNO (in_rtx);
4073 /* Don't try to renumber pseudo regs. It is possible for a pseudo reg
4074 to reach here as part of a REG_NOTE. */
4075 if (newreg >= FIRST_PSEUDO_REGISTER)
4080 newreg = LEAF_REG_REMAP (newreg);
4081 gcc_assert (newreg >= 0);
4082 df_set_regs_ever_live (REGNO (in_rtx), false);
4083 df_set_regs_ever_live (newreg, true);
4084 SET_REGNO (in_rtx, newreg);
4088 if (INSN_P (in_rtx))
4090 /* Inside a SEQUENCE, we find insns.
4091 Renumber just the patterns of these insns,
4092 just as we do for the top-level insns. */
4093 leaf_renumber_regs_insn (PATTERN (in_rtx));
4097 format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx));
4099 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
4100 switch (*format_ptr++)
4103 leaf_renumber_regs_insn (XEXP (in_rtx, i));
4107 if (NULL != XVEC (in_rtx, i))
4109 for (j = 0; j < XVECLEN (in_rtx, i); j++)
4110 leaf_renumber_regs_insn (XVECEXP (in_rtx, i, j));
4130 /* When -gused is used, emit debug info for only used symbols. But in
4131 addition to the standard intercepted debug_hooks there are some direct
4132 calls into this file, i.e., dbxout_symbol, dbxout_parms, and dbxout_reg_params.
4133 Those routines may also be called from a higher level intercepted routine. So
4134 to prevent recording data for an inner call to one of these for an intercept,
4135 we maintain an intercept nesting counter (debug_nesting). We only save the
4136 intercepted arguments if the nesting is 1. */
4137 int debug_nesting = 0;
4139 static tree *symbol_queue;
4140 int symbol_queue_index = 0;
4141 static int symbol_queue_size = 0;
4143 /* Generate the symbols for any queued up type symbols we encountered
4144 while generating the type info for some originally used symbol.
4145 This might generate additional entries in the queue. Only when
4146 the nesting depth goes to 0 is this routine called. */
4149 debug_flush_symbol_queue (void)
4153 /* Make sure that additionally queued items are not flushed
4158 for (i = 0; i < symbol_queue_index; ++i)
4160 /* If we pushed queued symbols then such symbols must be
4161 output no matter what anyone else says. Specifically,
4162 we need to make sure dbxout_symbol() thinks the symbol was
4163 used and also we need to override TYPE_DECL_SUPPRESS_DEBUG
4164 which may be set for outside reasons. */
4165 int saved_tree_used = TREE_USED (symbol_queue[i]);
4166 int saved_suppress_debug = TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]);
4167 TREE_USED (symbol_queue[i]) = 1;
4168 TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]) = 0;
4170 #ifdef DBX_DEBUGGING_INFO
4171 dbxout_symbol (symbol_queue[i], 0);
4174 TREE_USED (symbol_queue[i]) = saved_tree_used;
4175 TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]) = saved_suppress_debug;
4178 symbol_queue_index = 0;
4182 /* Queue a type symbol needed as part of the definition of a decl
4183 symbol. These symbols are generated when debug_flush_symbol_queue()
4187 debug_queue_symbol (tree decl)
4189 if (symbol_queue_index >= symbol_queue_size)
4191 symbol_queue_size += 10;
4192 symbol_queue = XRESIZEVEC (tree, symbol_queue, symbol_queue_size);
4195 symbol_queue[symbol_queue_index++] = decl;
4198 /* Free symbol queue. */
4200 debug_free_queue (void)
4204 free (symbol_queue);
4205 symbol_queue = NULL;
4206 symbol_queue_size = 0;
4210 /* Turn the RTL into assembly. */
4212 rest_of_handle_final (void)
4217 /* Get the function's name, as described by its RTL. This may be
4218 different from the DECL_NAME name used in the source file. */
4220 x = DECL_RTL (current_function_decl);
4221 gcc_assert (MEM_P (x));
4223 gcc_assert (GET_CODE (x) == SYMBOL_REF);
4224 fnname = XSTR (x, 0);
4226 assemble_start_function (current_function_decl, fnname);
4227 final_start_function (get_insns (), asm_out_file, optimize);
4228 final (get_insns (), asm_out_file, optimize);
4229 final_end_function ();
4231 #ifdef TARGET_UNWIND_INFO
4232 /* ??? The IA-64 ".handlerdata" directive must be issued before
4233 the ".endp" directive that closes the procedure descriptor. */
4234 output_function_exception_table (fnname);
4237 assemble_end_function (current_function_decl, fnname);
4239 #ifndef TARGET_UNWIND_INFO
4240 /* Otherwise, it feels unclean to switch sections in the middle. */
4241 output_function_exception_table (fnname);
4244 user_defined_section_attribute = false;
4246 /* Free up reg info memory. */
4250 fflush (asm_out_file);
4252 /* Write DBX symbols if requested. */
4254 /* Note that for those inline functions where we don't initially
4255 know for certain that we will be generating an out-of-line copy,
4256 the first invocation of this routine (rest_of_compilation) will
4257 skip over this code by doing a `goto exit_rest_of_compilation;'.
4258 Later on, wrapup_global_declarations will (indirectly) call
4259 rest_of_compilation again for those inline functions that need
4260 to have out-of-line copies generated. During that call, we
4261 *will* be routed past here. */
4263 timevar_push (TV_SYMOUT);
4264 (*debug_hooks->function_decl) (current_function_decl);
4265 timevar_pop (TV_SYMOUT);
4267 /* Release the blocks that are linked to DECL_INITIAL() to free the memory. */
4268 DECL_INITIAL (current_function_decl) = error_mark_node;
4270 if (DECL_STATIC_CONSTRUCTOR (current_function_decl)
4271 && targetm.have_ctors_dtors)
4272 targetm.asm_out.constructor (XEXP (DECL_RTL (current_function_decl), 0),
4273 decl_init_priority_lookup
4274 (current_function_decl));
4275 if (DECL_STATIC_DESTRUCTOR (current_function_decl)
4276 && targetm.have_ctors_dtors)
4277 targetm.asm_out.destructor (XEXP (DECL_RTL (current_function_decl), 0),
4278 decl_fini_priority_lookup
4279 (current_function_decl));
4283 struct rtl_opt_pass pass_final =
4289 rest_of_handle_final, /* execute */
4292 0, /* static_pass_number */
4293 TV_FINAL, /* tv_id */
4294 0, /* properties_required */
4295 0, /* properties_provided */
4296 0, /* properties_destroyed */
4297 0, /* todo_flags_start */
4298 TODO_ggc_collect /* todo_flags_finish */
4304 rest_of_handle_shorten_branches (void)
4306 /* Shorten branches. */
4307 shorten_branches (get_insns ());
4311 struct rtl_opt_pass pass_shorten_branches =
4315 "shorten", /* name */
4317 rest_of_handle_shorten_branches, /* execute */
4320 0, /* static_pass_number */
4321 TV_FINAL, /* tv_id */
4322 0, /* properties_required */
4323 0, /* properties_provided */
4324 0, /* properties_destroyed */
4325 0, /* todo_flags_start */
4326 TODO_dump_func /* todo_flags_finish */
4332 rest_of_clean_state (void)
4335 FILE *final_output = NULL;
4336 int save_unnumbered = flag_dump_unnumbered;
4337 int save_noaddr = flag_dump_noaddr;
4339 if (flag_dump_final_insns)
4341 final_output = fopen (flag_dump_final_insns, "a");
4344 error ("could not open final insn dump file %qs: %s",
4345 flag_dump_final_insns, strerror (errno));
4346 flag_dump_final_insns = NULL;
4352 aname = (IDENTIFIER_POINTER
4353 (DECL_ASSEMBLER_NAME (current_function_decl)));
4354 fprintf (final_output, "\n;; Function (%s) %s\n\n", aname,
4355 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
4357 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
4358 ? " (unlikely executed)"
4361 flag_dump_noaddr = flag_dump_unnumbered = 1;
4363 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
4365 INSN_UID (insn) = CODE_LABEL_NUMBER (insn);
4367 INSN_UID (insn) = 0;
4371 /* It is very important to decompose the RTL instruction chain here:
4372 debug information keeps pointing into CODE_LABEL insns inside the function
4373 body. If these remain pointing to the other insns, we end up preserving
4374 whole RTL chain and attached detailed debug info in memory. */
4375 for (insn = get_insns (); insn; insn = next)
4377 next = NEXT_INSN (insn);
4378 NEXT_INSN (insn) = NULL;
4379 PREV_INSN (insn) = NULL;
4382 && (!NOTE_P (insn) ||
4383 (NOTE_KIND (insn) != NOTE_INSN_VAR_LOCATION
4384 && NOTE_KIND (insn) != NOTE_INSN_BLOCK_BEG
4385 && NOTE_KIND (insn) != NOTE_INSN_BLOCK_END
4386 && NOTE_KIND (insn) != NOTE_INSN_CFA_RESTORE_STATE)))
4387 print_rtl_single (final_output, insn);
4393 flag_dump_noaddr = save_noaddr;
4394 flag_dump_unnumbered = save_unnumbered;
4396 if (fclose (final_output))
4398 error ("could not close final insn dump file %qs: %s",
4399 flag_dump_final_insns, strerror (errno));
4400 flag_dump_final_insns = NULL;
4404 /* In case the function was not output,
4405 don't leave any temporary anonymous types
4406 queued up for sdb output. */
4407 #ifdef SDB_DEBUGGING_INFO
4408 if (write_symbols == SDB_DEBUG)
4409 sdbout_types (NULL_TREE);
4412 flag_rerun_cse_after_global_opts = 0;
4413 reload_completed = 0;
4414 epilogue_completed = 0;
4416 regstack_completed = 0;
4419 /* Clear out the insn_length contents now that they are no
4421 init_insn_lengths ();
4423 /* Show no temporary slots allocated. */
4426 free_bb_for_insn ();
4430 if (targetm.binds_local_p (current_function_decl))
4432 unsigned int pref = crtl->preferred_stack_boundary;
4433 if (crtl->stack_alignment_needed > crtl->preferred_stack_boundary)
4434 pref = crtl->stack_alignment_needed;
4435 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
4439 /* Make sure volatile mem refs aren't considered valid operands for
4440 arithmetic insns. We must call this here if this is a nested inline
4441 function, since the above code leaves us in the init_recog state,
4442 and the function context push/pop code does not save/restore volatile_ok.
4444 ??? Maybe it isn't necessary for expand_start_function to call this
4445 anymore if we do it here? */
4447 init_recog_no_volatile ();
4449 /* We're done with this function. Free up memory if we can. */
4450 free_after_parsing (cfun);
4451 free_after_compilation (cfun);
4455 struct rtl_opt_pass pass_clean_state =
4459 "*clean_state", /* name */
4461 rest_of_clean_state, /* execute */
4464 0, /* static_pass_number */
4465 TV_FINAL, /* tv_id */
4466 0, /* properties_required */
4467 0, /* properties_provided */
4468 PROP_rtl, /* properties_destroyed */
4469 0, /* todo_flags_start */
4470 0 /* todo_flags_finish */