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
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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
23 /* This is the final pass of the compiler.
24 It looks at the rtl code for a function and outputs assembler code.
26 Call `final_start_function' to output the assembler code for function entry,
27 `final' to output assembler code for some RTL code,
28 `final_end_function' to output assembler code for function exit.
29 If a function is compiled in several pieces, each piece is
30 output separately with `final'.
32 Some optimizations are also done at this level.
33 Move instructions that were made unnecessary by good register allocation
34 are detected and omitted from the output. (Though most of these
35 are removed by the last jump pass.)
37 Instructions to set the condition codes are omitted when it can be
38 seen that the condition codes already had the desired values.
40 In some cases it is sufficient if the inherited condition codes
41 have related values, but this may require the following insn
42 (the one that tests the condition codes) to be modified.
44 The code for the function prologue and epilogue are generated
45 directly in assembler by the target functions function_prologue and
46 function_epilogue. Those instructions never exist as rtl. */
50 #include "coretypes.h"
57 #include "insn-config.h"
58 #include "insn-attr.h"
60 #include "conditions.h"
63 #include "hard-reg-set.h"
70 #include "basic-block.h"
74 #include "cfglayout.h"
75 #include "tree-pass.h"
80 #ifdef XCOFF_DEBUGGING_INFO
81 #include "xcoffout.h" /* Needed for external data
82 declarations for e.g. AIX 4.x. */
85 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
86 #include "dwarf2out.h"
89 #ifdef DBX_DEBUGGING_INFO
93 #ifdef SDB_DEBUGGING_INFO
97 /* If we aren't using cc0, CC_STATUS_INIT shouldn't exist. So define a
98 null default for it to save conditionalization later. */
99 #ifndef CC_STATUS_INIT
100 #define CC_STATUS_INIT
103 /* How to start an assembler comment. */
104 #ifndef ASM_COMMENT_START
105 #define ASM_COMMENT_START ";#"
108 /* Is the given character a logical line separator for the assembler? */
109 #ifndef IS_ASM_LOGICAL_LINE_SEPARATOR
110 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C) ((C) == ';')
113 #ifndef JUMP_TABLES_IN_TEXT_SECTION
114 #define JUMP_TABLES_IN_TEXT_SECTION 0
117 /* Bitflags used by final_scan_insn. */
120 #define SEEN_EMITTED 4
122 /* Last insn processed by final_scan_insn. */
123 static rtx debug_insn;
124 rtx current_output_insn;
126 /* Line number of last NOTE. */
127 static int last_linenum;
129 /* Highest line number in current block. */
130 static int high_block_linenum;
132 /* Likewise for function. */
133 static int high_function_linenum;
135 /* Filename of last NOTE. */
136 static const char *last_filename;
138 /* Whether to force emission of a line note before the next insn. */
139 static bool force_source_line = false;
141 extern const int length_unit_log; /* This is defined in insn-attrtab.c. */
143 /* Nonzero while outputting an `asm' with operands.
144 This means that inconsistencies are the user's fault, so don't die.
145 The precise value is the insn being output, to pass to error_for_asm. */
146 rtx this_is_asm_operands;
148 /* Number of operands of this insn, for an `asm' with operands. */
149 static unsigned int insn_noperands;
151 /* Compare optimization flag. */
153 static rtx last_ignored_compare = 0;
155 /* Assign a unique number to each insn that is output.
156 This can be used to generate unique local labels. */
158 static int insn_counter = 0;
161 /* This variable contains machine-dependent flags (defined in tm.h)
162 set and examined by output routines
163 that describe how to interpret the condition codes properly. */
167 /* During output of an insn, this contains a copy of cc_status
168 from before the insn. */
170 CC_STATUS cc_prev_status;
173 /* Indexed by hardware reg number, is 1 if that register is ever
174 used in the current function.
176 In life_analysis, or in stupid_life_analysis, this is set
177 up to record the hard regs used explicitly. Reload adds
178 in the hard regs used for holding pseudo regs. Final uses
179 it to generate the code in the function prologue and epilogue
180 to save and restore registers as needed. */
182 char regs_ever_live[FIRST_PSEUDO_REGISTER];
184 /* Like regs_ever_live, but 1 if a reg is set or clobbered from an asm.
185 Unlike regs_ever_live, elements of this array corresponding to
186 eliminable regs like the frame pointer are set if an asm sets them. */
188 char regs_asm_clobbered[FIRST_PSEUDO_REGISTER];
190 /* Nonzero means current function must be given a frame pointer.
191 Initialized in function.c to 0. Set only in reload1.c as per
192 the needs of the function. */
194 int frame_pointer_needed;
196 /* Number of unmatched NOTE_INSN_BLOCK_BEG notes we have seen. */
198 static int block_depth;
200 /* Nonzero if have enabled APP processing of our assembler output. */
204 /* If we are outputting an insn sequence, this contains the sequence rtx.
209 #ifdef ASSEMBLER_DIALECT
211 /* Number of the assembler dialect to use, starting at 0. */
212 static int dialect_number;
215 #ifdef HAVE_conditional_execution
216 /* Nonnull if the insn currently being emitted was a COND_EXEC pattern. */
217 rtx current_insn_predicate;
220 #ifdef HAVE_ATTR_length
221 static int asm_insn_count (rtx);
223 static void profile_function (FILE *);
224 static void profile_after_prologue (FILE *);
225 static bool notice_source_line (rtx);
226 static rtx walk_alter_subreg (rtx *);
227 static void output_asm_name (void);
228 static void output_alternate_entry_point (FILE *, rtx);
229 static tree get_mem_expr_from_op (rtx, int *);
230 static void output_asm_operand_names (rtx *, int *, int);
231 static void output_operand (rtx, int);
232 #ifdef LEAF_REGISTERS
233 static void leaf_renumber_regs (rtx);
236 static int alter_cond (rtx);
238 #ifndef ADDR_VEC_ALIGN
239 static int final_addr_vec_align (rtx);
241 #ifdef HAVE_ATTR_length
242 static int align_fuzz (rtx, rtx, int, unsigned);
245 /* Initialize data in final at the beginning of a compilation. */
248 init_final (const char *filename ATTRIBUTE_UNUSED)
253 #ifdef ASSEMBLER_DIALECT
254 dialect_number = ASSEMBLER_DIALECT;
258 /* Default target function prologue and epilogue assembler output.
260 If not overridden for epilogue code, then the function body itself
261 contains return instructions wherever needed. */
263 default_function_pro_epilogue (FILE *file ATTRIBUTE_UNUSED,
264 HOST_WIDE_INT size ATTRIBUTE_UNUSED)
268 /* Default target hook that outputs nothing to a stream. */
270 no_asm_to_stream (FILE *file ATTRIBUTE_UNUSED)
274 /* Enable APP processing of subsequent output.
275 Used before the output from an `asm' statement. */
282 fputs (ASM_APP_ON, asm_out_file);
287 /* Disable APP processing of subsequent output.
288 Called from varasm.c before most kinds of output. */
295 fputs (ASM_APP_OFF, asm_out_file);
300 /* Return the number of slots filled in the current
301 delayed branch sequence (we don't count the insn needing the
302 delay slot). Zero if not in a delayed branch sequence. */
306 dbr_sequence_length (void)
308 if (final_sequence != 0)
309 return XVECLEN (final_sequence, 0) - 1;
315 /* The next two pages contain routines used to compute the length of an insn
316 and to shorten branches. */
318 /* Arrays for insn lengths, and addresses. The latter is referenced by
319 `insn_current_length'. */
321 static int *insn_lengths;
323 varray_type insn_addresses_;
325 /* Max uid for which the above arrays are valid. */
326 static int insn_lengths_max_uid;
328 /* Address of insn being processed. Used by `insn_current_length'. */
329 int insn_current_address;
331 /* Address of insn being processed in previous iteration. */
332 int insn_last_address;
334 /* known invariant alignment of insn being processed. */
335 int insn_current_align;
337 /* After shorten_branches, for any insn, uid_align[INSN_UID (insn)]
338 gives the next following alignment insn that increases the known
339 alignment, or NULL_RTX if there is no such insn.
340 For any alignment obtained this way, we can again index uid_align with
341 its uid to obtain the next following align that in turn increases the
342 alignment, till we reach NULL_RTX; the sequence obtained this way
343 for each insn we'll call the alignment chain of this insn in the following
346 struct label_alignment
352 static rtx *uid_align;
353 static int *uid_shuid;
354 static struct label_alignment *label_align;
356 /* Indicate that branch shortening hasn't yet been done. */
359 init_insn_lengths (void)
370 insn_lengths_max_uid = 0;
372 #ifdef HAVE_ATTR_length
373 INSN_ADDRESSES_FREE ();
382 /* Obtain the current length of an insn. If branch shortening has been done,
383 get its actual length. Otherwise, use FALLBACK_FN to calcualte the
386 get_attr_length_1 (rtx insn ATTRIBUTE_UNUSED,
387 int (*fallback_fn) (rtx) ATTRIBUTE_UNUSED)
389 #ifdef HAVE_ATTR_length
394 if (insn_lengths_max_uid > INSN_UID (insn))
395 return insn_lengths[INSN_UID (insn)];
397 switch (GET_CODE (insn))
405 length = fallback_fn (insn);
409 body = PATTERN (insn);
410 if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
412 /* Alignment is machine-dependent and should be handled by
416 length = fallback_fn (insn);
420 body = PATTERN (insn);
421 if (GET_CODE (body) == USE || GET_CODE (body) == CLOBBER)
424 else if (GET_CODE (body) == ASM_INPUT || asm_noperands (body) >= 0)
425 length = asm_insn_count (body) * fallback_fn (insn);
426 else if (GET_CODE (body) == SEQUENCE)
427 for (i = 0; i < XVECLEN (body, 0); i++)
428 length += get_attr_length (XVECEXP (body, 0, i));
430 length = fallback_fn (insn);
437 #ifdef ADJUST_INSN_LENGTH
438 ADJUST_INSN_LENGTH (insn, length);
441 #else /* not HAVE_ATTR_length */
443 #define insn_default_length 0
444 #define insn_min_length 0
445 #endif /* not HAVE_ATTR_length */
448 /* Obtain the current length of an insn. If branch shortening has been done,
449 get its actual length. Otherwise, get its maximum length. */
451 get_attr_length (rtx insn)
453 return get_attr_length_1 (insn, insn_default_length);
456 /* Obtain the current length of an insn. If branch shortening has been done,
457 get its actual length. Otherwise, get its minimum length. */
459 get_attr_min_length (rtx insn)
461 return get_attr_length_1 (insn, insn_min_length);
464 /* Code to handle alignment inside shorten_branches. */
466 /* Here is an explanation how the algorithm in align_fuzz can give
469 Call a sequence of instructions beginning with alignment point X
470 and continuing until the next alignment point `block X'. When `X'
471 is used in an expression, it means the alignment value of the
474 Call the distance between the start of the first insn of block X, and
475 the end of the last insn of block X `IX', for the `inner size of X'.
476 This is clearly the sum of the instruction lengths.
478 Likewise with the next alignment-delimited block following X, which we
481 Call the distance between the start of the first insn of block X, and
482 the start of the first insn of block Y `OX', for the `outer size of X'.
484 The estimated padding is then OX - IX.
486 OX can be safely estimated as
491 OX = round_up(IX, X) + Y - X
493 Clearly est(IX) >= real(IX), because that only depends on the
494 instruction lengths, and those being overestimated is a given.
496 Clearly round_up(foo, Z) >= round_up(bar, Z) if foo >= bar, so
497 we needn't worry about that when thinking about OX.
499 When X >= Y, the alignment provided by Y adds no uncertainty factor
500 for branch ranges starting before X, so we can just round what we have.
501 But when X < Y, we don't know anything about the, so to speak,
502 `middle bits', so we have to assume the worst when aligning up from an
503 address mod X to one mod Y, which is Y - X. */
506 #define LABEL_ALIGN(LABEL) align_labels_log
509 #ifndef LABEL_ALIGN_MAX_SKIP
510 #define LABEL_ALIGN_MAX_SKIP align_labels_max_skip
514 #define LOOP_ALIGN(LABEL) align_loops_log
517 #ifndef LOOP_ALIGN_MAX_SKIP
518 #define LOOP_ALIGN_MAX_SKIP align_loops_max_skip
521 #ifndef LABEL_ALIGN_AFTER_BARRIER
522 #define LABEL_ALIGN_AFTER_BARRIER(LABEL) 0
525 #ifndef LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP
526 #define LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP 0
530 #define JUMP_ALIGN(LABEL) align_jumps_log
533 #ifndef JUMP_ALIGN_MAX_SKIP
534 #define JUMP_ALIGN_MAX_SKIP align_jumps_max_skip
537 #ifndef ADDR_VEC_ALIGN
539 final_addr_vec_align (rtx addr_vec)
541 int align = GET_MODE_SIZE (GET_MODE (PATTERN (addr_vec)));
543 if (align > BIGGEST_ALIGNMENT / BITS_PER_UNIT)
544 align = BIGGEST_ALIGNMENT / BITS_PER_UNIT;
545 return exact_log2 (align);
549 #define ADDR_VEC_ALIGN(ADDR_VEC) final_addr_vec_align (ADDR_VEC)
552 #ifndef INSN_LENGTH_ALIGNMENT
553 #define INSN_LENGTH_ALIGNMENT(INSN) length_unit_log
556 #define INSN_SHUID(INSN) (uid_shuid[INSN_UID (INSN)])
558 static int min_labelno, max_labelno;
560 #define LABEL_TO_ALIGNMENT(LABEL) \
561 (label_align[CODE_LABEL_NUMBER (LABEL) - min_labelno].alignment)
563 #define LABEL_TO_MAX_SKIP(LABEL) \
564 (label_align[CODE_LABEL_NUMBER (LABEL) - min_labelno].max_skip)
566 /* For the benefit of port specific code do this also as a function. */
569 label_to_alignment (rtx label)
571 return LABEL_TO_ALIGNMENT (label);
574 #ifdef HAVE_ATTR_length
575 /* The differences in addresses
576 between a branch and its target might grow or shrink depending on
577 the alignment the start insn of the range (the branch for a forward
578 branch or the label for a backward branch) starts out on; if these
579 differences are used naively, they can even oscillate infinitely.
580 We therefore want to compute a 'worst case' address difference that
581 is independent of the alignment the start insn of the range end
582 up on, and that is at least as large as the actual difference.
583 The function align_fuzz calculates the amount we have to add to the
584 naively computed difference, by traversing the part of the alignment
585 chain of the start insn of the range that is in front of the end insn
586 of the range, and considering for each alignment the maximum amount
587 that it might contribute to a size increase.
589 For casesi tables, we also want to know worst case minimum amounts of
590 address difference, in case a machine description wants to introduce
591 some common offset that is added to all offsets in a table.
592 For this purpose, align_fuzz with a growth argument of 0 computes the
593 appropriate adjustment. */
595 /* Compute the maximum delta by which the difference of the addresses of
596 START and END might grow / shrink due to a different address for start
597 which changes the size of alignment insns between START and END.
598 KNOWN_ALIGN_LOG is the alignment known for START.
599 GROWTH should be ~0 if the objective is to compute potential code size
600 increase, and 0 if the objective is to compute potential shrink.
601 The return value is undefined for any other value of GROWTH. */
604 align_fuzz (rtx start, rtx end, int known_align_log, unsigned int growth)
606 int uid = INSN_UID (start);
608 int known_align = 1 << known_align_log;
609 int end_shuid = INSN_SHUID (end);
612 for (align_label = uid_align[uid]; align_label; align_label = uid_align[uid])
614 int align_addr, new_align;
616 uid = INSN_UID (align_label);
617 align_addr = INSN_ADDRESSES (uid) - insn_lengths[uid];
618 if (uid_shuid[uid] > end_shuid)
620 known_align_log = LABEL_TO_ALIGNMENT (align_label);
621 new_align = 1 << known_align_log;
622 if (new_align < known_align)
624 fuzz += (-align_addr ^ growth) & (new_align - known_align);
625 known_align = new_align;
630 /* Compute a worst-case reference address of a branch so that it
631 can be safely used in the presence of aligned labels. Since the
632 size of the branch itself is unknown, the size of the branch is
633 not included in the range. I.e. for a forward branch, the reference
634 address is the end address of the branch as known from the previous
635 branch shortening pass, minus a value to account for possible size
636 increase due to alignment. For a backward branch, it is the start
637 address of the branch as known from the current pass, plus a value
638 to account for possible size increase due to alignment.
639 NB.: Therefore, the maximum offset allowed for backward branches needs
640 to exclude the branch size. */
643 insn_current_reference_address (rtx branch)
648 if (! INSN_ADDRESSES_SET_P ())
651 seq = NEXT_INSN (PREV_INSN (branch));
652 seq_uid = INSN_UID (seq);
653 if (!JUMP_P (branch))
654 /* This can happen for example on the PA; the objective is to know the
655 offset to address something in front of the start of the function.
656 Thus, we can treat it like a backward branch.
657 We assume here that FUNCTION_BOUNDARY / BITS_PER_UNIT is larger than
658 any alignment we'd encounter, so we skip the call to align_fuzz. */
659 return insn_current_address;
660 dest = JUMP_LABEL (branch);
662 /* BRANCH has no proper alignment chain set, so use SEQ.
663 BRANCH also has no INSN_SHUID. */
664 if (INSN_SHUID (seq) < INSN_SHUID (dest))
666 /* Forward branch. */
667 return (insn_last_address + insn_lengths[seq_uid]
668 - align_fuzz (seq, dest, length_unit_log, ~0));
672 /* Backward branch. */
673 return (insn_current_address
674 + align_fuzz (dest, seq, length_unit_log, ~0));
677 #endif /* HAVE_ATTR_length */
679 /* Compute branch alignments based on frequency information in the
683 compute_alignments (void)
685 int log, max_skip, max_log;
694 max_labelno = max_label_num ();
695 min_labelno = get_first_label_num ();
696 label_align = XCNEWVEC (struct label_alignment, max_labelno - min_labelno + 1);
698 /* If not optimizing or optimizing for size, don't assign any alignments. */
699 if (! optimize || optimize_size)
704 rtx label = BB_HEAD (bb);
705 int fallthru_frequency = 0, branch_frequency = 0, has_fallthru = 0;
710 || probably_never_executed_bb_p (bb))
712 max_log = LABEL_ALIGN (label);
713 max_skip = LABEL_ALIGN_MAX_SKIP;
715 FOR_EACH_EDGE (e, ei, bb->preds)
717 if (e->flags & EDGE_FALLTHRU)
718 has_fallthru = 1, fallthru_frequency += EDGE_FREQUENCY (e);
720 branch_frequency += EDGE_FREQUENCY (e);
723 /* There are two purposes to align block with no fallthru incoming edge:
724 1) to avoid fetch stalls when branch destination is near cache boundary
725 2) to improve cache efficiency in case the previous block is not executed
726 (so it does not need to be in the cache).
728 We to catch first case, we align frequently executed blocks.
729 To catch the second, we align blocks that are executed more frequently
730 than the predecessor and the predecessor is likely to not be executed
731 when function is called. */
734 && (branch_frequency > BB_FREQ_MAX / 10
735 || (bb->frequency > bb->prev_bb->frequency * 10
736 && (bb->prev_bb->frequency
737 <= ENTRY_BLOCK_PTR->frequency / 2))))
739 log = JUMP_ALIGN (label);
743 max_skip = JUMP_ALIGN_MAX_SKIP;
746 /* In case block is frequent and reached mostly by non-fallthru edge,
747 align it. It is most likely a first block of loop. */
749 && maybe_hot_bb_p (bb)
750 && branch_frequency + fallthru_frequency > BB_FREQ_MAX / 10
751 && branch_frequency > fallthru_frequency * 2)
753 log = LOOP_ALIGN (label);
757 max_skip = LOOP_ALIGN_MAX_SKIP;
760 LABEL_TO_ALIGNMENT (label) = max_log;
761 LABEL_TO_MAX_SKIP (label) = max_skip;
766 struct tree_opt_pass pass_compute_alignments =
770 compute_alignments, /* execute */
773 0, /* static_pass_number */
775 0, /* properties_required */
776 0, /* properties_provided */
777 0, /* properties_destroyed */
778 0, /* todo_flags_start */
779 0, /* todo_flags_finish */
784 /* Make a pass over all insns and compute their actual lengths by shortening
785 any branches of variable length if possible. */
787 /* shorten_branches might be called multiple times: for example, the SH
788 port splits out-of-range conditional branches in MACHINE_DEPENDENT_REORG.
789 In order to do this, it needs proper length information, which it obtains
790 by calling shorten_branches. This cannot be collapsed with
791 shorten_branches itself into a single pass unless we also want to integrate
792 reorg.c, since the branch splitting exposes new instructions with delay
796 shorten_branches (rtx first ATTRIBUTE_UNUSED)
803 #ifdef HAVE_ATTR_length
804 #define MAX_CODE_ALIGN 16
806 int something_changed = 1;
807 char *varying_length;
810 rtx align_tab[MAX_CODE_ALIGN];
814 /* Compute maximum UID and allocate label_align / uid_shuid. */
815 max_uid = get_max_uid ();
817 /* Free uid_shuid before reallocating it. */
820 uid_shuid = XNEWVEC (int, max_uid);
822 if (max_labelno != max_label_num ())
824 int old = max_labelno;
828 max_labelno = max_label_num ();
830 n_labels = max_labelno - min_labelno + 1;
831 n_old_labels = old - min_labelno + 1;
833 label_align = xrealloc (label_align,
834 n_labels * sizeof (struct label_alignment));
836 /* Range of labels grows monotonically in the function. Failing here
837 means that the initialization of array got lost. */
838 gcc_assert (n_old_labels <= n_labels);
840 memset (label_align + n_old_labels, 0,
841 (n_labels - n_old_labels) * sizeof (struct label_alignment));
844 /* Initialize label_align and set up uid_shuid to be strictly
845 monotonically rising with insn order. */
846 /* We use max_log here to keep track of the maximum alignment we want to
847 impose on the next CODE_LABEL (or the current one if we are processing
848 the CODE_LABEL itself). */
853 for (insn = get_insns (), i = 1; insn; insn = NEXT_INSN (insn))
857 INSN_SHUID (insn) = i++;
865 /* Merge in alignments computed by compute_alignments. */
866 log = LABEL_TO_ALIGNMENT (insn);
870 max_skip = LABEL_TO_MAX_SKIP (insn);
873 log = LABEL_ALIGN (insn);
877 max_skip = LABEL_ALIGN_MAX_SKIP;
879 next = next_nonnote_insn (insn);
880 /* ADDR_VECs only take room if read-only data goes into the text
882 if (JUMP_TABLES_IN_TEXT_SECTION
883 || readonly_data_section == text_section)
884 if (next && JUMP_P (next))
886 rtx nextbody = PATTERN (next);
887 if (GET_CODE (nextbody) == ADDR_VEC
888 || GET_CODE (nextbody) == ADDR_DIFF_VEC)
890 log = ADDR_VEC_ALIGN (next);
894 max_skip = LABEL_ALIGN_MAX_SKIP;
898 LABEL_TO_ALIGNMENT (insn) = max_log;
899 LABEL_TO_MAX_SKIP (insn) = max_skip;
903 else if (BARRIER_P (insn))
907 for (label = insn; label && ! INSN_P (label);
908 label = NEXT_INSN (label))
911 log = LABEL_ALIGN_AFTER_BARRIER (insn);
915 max_skip = LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP;
921 #ifdef HAVE_ATTR_length
923 /* Allocate the rest of the arrays. */
924 insn_lengths = XNEWVEC (int, max_uid);
925 insn_lengths_max_uid = max_uid;
926 /* Syntax errors can lead to labels being outside of the main insn stream.
927 Initialize insn_addresses, so that we get reproducible results. */
928 INSN_ADDRESSES_ALLOC (max_uid);
930 varying_length = XCNEWVEC (char, max_uid);
932 /* Initialize uid_align. We scan instructions
933 from end to start, and keep in align_tab[n] the last seen insn
934 that does an alignment of at least n+1, i.e. the successor
935 in the alignment chain for an insn that does / has a known
937 uid_align = XCNEWVEC (rtx, max_uid);
939 for (i = MAX_CODE_ALIGN; --i >= 0;)
940 align_tab[i] = NULL_RTX;
941 seq = get_last_insn ();
942 for (; seq; seq = PREV_INSN (seq))
944 int uid = INSN_UID (seq);
946 log = (LABEL_P (seq) ? LABEL_TO_ALIGNMENT (seq) : 0);
947 uid_align[uid] = align_tab[0];
950 /* Found an alignment label. */
951 uid_align[uid] = align_tab[log];
952 for (i = log - 1; i >= 0; i--)
956 #ifdef CASE_VECTOR_SHORTEN_MODE
959 /* Look for ADDR_DIFF_VECs, and initialize their minimum and maximum
962 int min_shuid = INSN_SHUID (get_insns ()) - 1;
963 int max_shuid = INSN_SHUID (get_last_insn ()) + 1;
966 for (insn = first; insn != 0; insn = NEXT_INSN (insn))
968 rtx min_lab = NULL_RTX, max_lab = NULL_RTX, pat;
969 int len, i, min, max, insn_shuid;
971 addr_diff_vec_flags flags;
974 || GET_CODE (PATTERN (insn)) != ADDR_DIFF_VEC)
976 pat = PATTERN (insn);
977 len = XVECLEN (pat, 1);
978 gcc_assert (len > 0);
979 min_align = MAX_CODE_ALIGN;
980 for (min = max_shuid, max = min_shuid, i = len - 1; i >= 0; i--)
982 rtx lab = XEXP (XVECEXP (pat, 1, i), 0);
983 int shuid = INSN_SHUID (lab);
994 if (min_align > LABEL_TO_ALIGNMENT (lab))
995 min_align = LABEL_TO_ALIGNMENT (lab);
997 XEXP (pat, 2) = gen_rtx_LABEL_REF (Pmode, min_lab);
998 XEXP (pat, 3) = gen_rtx_LABEL_REF (Pmode, max_lab);
999 insn_shuid = INSN_SHUID (insn);
1000 rel = INSN_SHUID (XEXP (XEXP (pat, 0), 0));
1001 memset (&flags, 0, sizeof (flags));
1002 flags.min_align = min_align;
1003 flags.base_after_vec = rel > insn_shuid;
1004 flags.min_after_vec = min > insn_shuid;
1005 flags.max_after_vec = max > insn_shuid;
1006 flags.min_after_base = min > rel;
1007 flags.max_after_base = max > rel;
1008 ADDR_DIFF_VEC_FLAGS (pat) = flags;
1011 #endif /* CASE_VECTOR_SHORTEN_MODE */
1013 /* Compute initial lengths, addresses, and varying flags for each insn. */
1014 for (insn_current_address = 0, insn = first;
1016 insn_current_address += insn_lengths[uid], insn = NEXT_INSN (insn))
1018 uid = INSN_UID (insn);
1020 insn_lengths[uid] = 0;
1024 int log = LABEL_TO_ALIGNMENT (insn);
1027 int align = 1 << log;
1028 int new_address = (insn_current_address + align - 1) & -align;
1029 insn_lengths[uid] = new_address - insn_current_address;
1033 INSN_ADDRESSES (uid) = insn_current_address + insn_lengths[uid];
1035 if (NOTE_P (insn) || BARRIER_P (insn)
1038 if (INSN_DELETED_P (insn))
1041 body = PATTERN (insn);
1042 if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
1044 /* This only takes room if read-only data goes into the text
1046 if (JUMP_TABLES_IN_TEXT_SECTION
1047 || readonly_data_section == text_section)
1048 insn_lengths[uid] = (XVECLEN (body,
1049 GET_CODE (body) == ADDR_DIFF_VEC)
1050 * GET_MODE_SIZE (GET_MODE (body)));
1051 /* Alignment is handled by ADDR_VEC_ALIGN. */
1053 else if (GET_CODE (body) == ASM_INPUT || asm_noperands (body) >= 0)
1054 insn_lengths[uid] = asm_insn_count (body) * insn_default_length (insn);
1055 else if (GET_CODE (body) == SEQUENCE)
1058 int const_delay_slots;
1060 const_delay_slots = const_num_delay_slots (XVECEXP (body, 0, 0));
1062 const_delay_slots = 0;
1064 /* Inside a delay slot sequence, we do not do any branch shortening
1065 if the shortening could change the number of delay slots
1067 for (i = 0; i < XVECLEN (body, 0); i++)
1069 rtx inner_insn = XVECEXP (body, 0, i);
1070 int inner_uid = INSN_UID (inner_insn);
1073 if (GET_CODE (body) == ASM_INPUT
1074 || asm_noperands (PATTERN (XVECEXP (body, 0, i))) >= 0)
1075 inner_length = (asm_insn_count (PATTERN (inner_insn))
1076 * insn_default_length (inner_insn));
1078 inner_length = insn_default_length (inner_insn);
1080 insn_lengths[inner_uid] = inner_length;
1081 if (const_delay_slots)
1083 if ((varying_length[inner_uid]
1084 = insn_variable_length_p (inner_insn)) != 0)
1085 varying_length[uid] = 1;
1086 INSN_ADDRESSES (inner_uid) = (insn_current_address
1087 + insn_lengths[uid]);
1090 varying_length[inner_uid] = 0;
1091 insn_lengths[uid] += inner_length;
1094 else if (GET_CODE (body) != USE && GET_CODE (body) != CLOBBER)
1096 insn_lengths[uid] = insn_default_length (insn);
1097 varying_length[uid] = insn_variable_length_p (insn);
1100 /* If needed, do any adjustment. */
1101 #ifdef ADJUST_INSN_LENGTH
1102 ADJUST_INSN_LENGTH (insn, insn_lengths[uid]);
1103 if (insn_lengths[uid] < 0)
1104 fatal_insn ("negative insn length", insn);
1108 /* Now loop over all the insns finding varying length insns. For each,
1109 get the current insn length. If it has changed, reflect the change.
1110 When nothing changes for a full pass, we are done. */
1112 while (something_changed)
1114 something_changed = 0;
1115 insn_current_align = MAX_CODE_ALIGN - 1;
1116 for (insn_current_address = 0, insn = first;
1118 insn = NEXT_INSN (insn))
1121 #ifdef ADJUST_INSN_LENGTH
1126 uid = INSN_UID (insn);
1130 int log = LABEL_TO_ALIGNMENT (insn);
1131 if (log > insn_current_align)
1133 int align = 1 << log;
1134 int new_address= (insn_current_address + align - 1) & -align;
1135 insn_lengths[uid] = new_address - insn_current_address;
1136 insn_current_align = log;
1137 insn_current_address = new_address;
1140 insn_lengths[uid] = 0;
1141 INSN_ADDRESSES (uid) = insn_current_address;
1145 length_align = INSN_LENGTH_ALIGNMENT (insn);
1146 if (length_align < insn_current_align)
1147 insn_current_align = length_align;
1149 insn_last_address = INSN_ADDRESSES (uid);
1150 INSN_ADDRESSES (uid) = insn_current_address;
1152 #ifdef CASE_VECTOR_SHORTEN_MODE
1153 if (optimize && JUMP_P (insn)
1154 && GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC)
1156 rtx body = PATTERN (insn);
1157 int old_length = insn_lengths[uid];
1158 rtx rel_lab = XEXP (XEXP (body, 0), 0);
1159 rtx min_lab = XEXP (XEXP (body, 2), 0);
1160 rtx max_lab = XEXP (XEXP (body, 3), 0);
1161 int rel_addr = INSN_ADDRESSES (INSN_UID (rel_lab));
1162 int min_addr = INSN_ADDRESSES (INSN_UID (min_lab));
1163 int max_addr = INSN_ADDRESSES (INSN_UID (max_lab));
1166 addr_diff_vec_flags flags;
1168 /* Avoid automatic aggregate initialization. */
1169 flags = ADDR_DIFF_VEC_FLAGS (body);
1171 /* Try to find a known alignment for rel_lab. */
1172 for (prev = rel_lab;
1174 && ! insn_lengths[INSN_UID (prev)]
1175 && ! (varying_length[INSN_UID (prev)] & 1);
1176 prev = PREV_INSN (prev))
1177 if (varying_length[INSN_UID (prev)] & 2)
1179 rel_align = LABEL_TO_ALIGNMENT (prev);
1183 /* See the comment on addr_diff_vec_flags in rtl.h for the
1184 meaning of the flags values. base: REL_LAB vec: INSN */
1185 /* Anything after INSN has still addresses from the last
1186 pass; adjust these so that they reflect our current
1187 estimate for this pass. */
1188 if (flags.base_after_vec)
1189 rel_addr += insn_current_address - insn_last_address;
1190 if (flags.min_after_vec)
1191 min_addr += insn_current_address - insn_last_address;
1192 if (flags.max_after_vec)
1193 max_addr += insn_current_address - insn_last_address;
1194 /* We want to know the worst case, i.e. lowest possible value
1195 for the offset of MIN_LAB. If MIN_LAB is after REL_LAB,
1196 its offset is positive, and we have to be wary of code shrink;
1197 otherwise, it is negative, and we have to be vary of code
1199 if (flags.min_after_base)
1201 /* If INSN is between REL_LAB and MIN_LAB, the size
1202 changes we are about to make can change the alignment
1203 within the observed offset, therefore we have to break
1204 it up into two parts that are independent. */
1205 if (! flags.base_after_vec && flags.min_after_vec)
1207 min_addr -= align_fuzz (rel_lab, insn, rel_align, 0);
1208 min_addr -= align_fuzz (insn, min_lab, 0, 0);
1211 min_addr -= align_fuzz (rel_lab, min_lab, rel_align, 0);
1215 if (flags.base_after_vec && ! flags.min_after_vec)
1217 min_addr -= align_fuzz (min_lab, insn, 0, ~0);
1218 min_addr -= align_fuzz (insn, rel_lab, 0, ~0);
1221 min_addr -= align_fuzz (min_lab, rel_lab, 0, ~0);
1223 /* Likewise, determine the highest lowest possible value
1224 for the offset of MAX_LAB. */
1225 if (flags.max_after_base)
1227 if (! flags.base_after_vec && flags.max_after_vec)
1229 max_addr += align_fuzz (rel_lab, insn, rel_align, ~0);
1230 max_addr += align_fuzz (insn, max_lab, 0, ~0);
1233 max_addr += align_fuzz (rel_lab, max_lab, rel_align, ~0);
1237 if (flags.base_after_vec && ! flags.max_after_vec)
1239 max_addr += align_fuzz (max_lab, insn, 0, 0);
1240 max_addr += align_fuzz (insn, rel_lab, 0, 0);
1243 max_addr += align_fuzz (max_lab, rel_lab, 0, 0);
1245 PUT_MODE (body, CASE_VECTOR_SHORTEN_MODE (min_addr - rel_addr,
1246 max_addr - rel_addr,
1248 if (JUMP_TABLES_IN_TEXT_SECTION
1249 || readonly_data_section == text_section)
1252 = (XVECLEN (body, 1) * GET_MODE_SIZE (GET_MODE (body)));
1253 insn_current_address += insn_lengths[uid];
1254 if (insn_lengths[uid] != old_length)
1255 something_changed = 1;
1260 #endif /* CASE_VECTOR_SHORTEN_MODE */
1262 if (! (varying_length[uid]))
1264 if (NONJUMP_INSN_P (insn)
1265 && GET_CODE (PATTERN (insn)) == SEQUENCE)
1269 body = PATTERN (insn);
1270 for (i = 0; i < XVECLEN (body, 0); i++)
1272 rtx inner_insn = XVECEXP (body, 0, i);
1273 int inner_uid = INSN_UID (inner_insn);
1275 INSN_ADDRESSES (inner_uid) = insn_current_address;
1277 insn_current_address += insn_lengths[inner_uid];
1281 insn_current_address += insn_lengths[uid];
1286 if (NONJUMP_INSN_P (insn) && GET_CODE (PATTERN (insn)) == SEQUENCE)
1290 body = PATTERN (insn);
1292 for (i = 0; i < XVECLEN (body, 0); i++)
1294 rtx inner_insn = XVECEXP (body, 0, i);
1295 int inner_uid = INSN_UID (inner_insn);
1298 INSN_ADDRESSES (inner_uid) = insn_current_address;
1300 /* insn_current_length returns 0 for insns with a
1301 non-varying length. */
1302 if (! varying_length[inner_uid])
1303 inner_length = insn_lengths[inner_uid];
1305 inner_length = insn_current_length (inner_insn);
1307 if (inner_length != insn_lengths[inner_uid])
1309 insn_lengths[inner_uid] = inner_length;
1310 something_changed = 1;
1312 insn_current_address += insn_lengths[inner_uid];
1313 new_length += inner_length;
1318 new_length = insn_current_length (insn);
1319 insn_current_address += new_length;
1322 #ifdef ADJUST_INSN_LENGTH
1323 /* If needed, do any adjustment. */
1324 tmp_length = new_length;
1325 ADJUST_INSN_LENGTH (insn, new_length);
1326 insn_current_address += (new_length - tmp_length);
1329 if (new_length != insn_lengths[uid])
1331 insn_lengths[uid] = new_length;
1332 something_changed = 1;
1335 /* For a non-optimizing compile, do only a single pass. */
1340 free (varying_length);
1342 #endif /* HAVE_ATTR_length */
1345 #ifdef HAVE_ATTR_length
1346 /* Given the body of an INSN known to be generated by an ASM statement, return
1347 the number of machine instructions likely to be generated for this insn.
1348 This is used to compute its length. */
1351 asm_insn_count (rtx body)
1353 const char *template;
1356 if (GET_CODE (body) == ASM_INPUT)
1357 template = XSTR (body, 0);
1359 template = decode_asm_operands (body, NULL, NULL, NULL, NULL);
1361 for (; *template; template++)
1362 if (IS_ASM_LOGICAL_LINE_SEPARATOR (*template) || *template == '\n')
1369 /* Output assembler code for the start of a function,
1370 and initialize some of the variables in this file
1371 for the new function. The label for the function and associated
1372 assembler pseudo-ops have already been output in `assemble_start_function'.
1374 FIRST is the first insn of the rtl for the function being compiled.
1375 FILE is the file to write assembler code to.
1376 OPTIMIZE is nonzero if we should eliminate redundant
1377 test and compare insns. */
1380 final_start_function (rtx first ATTRIBUTE_UNUSED, FILE *file,
1381 int optimize ATTRIBUTE_UNUSED)
1385 this_is_asm_operands = 0;
1387 last_filename = locator_file (prologue_locator);
1388 last_linenum = locator_line (prologue_locator);
1390 high_block_linenum = high_function_linenum = last_linenum;
1392 (*debug_hooks->begin_prologue) (last_linenum, last_filename);
1394 #if defined (DWARF2_UNWIND_INFO) || defined (TARGET_UNWIND_INFO)
1395 if (write_symbols != DWARF2_DEBUG && write_symbols != VMS_AND_DWARF2_DEBUG)
1396 dwarf2out_begin_prologue (0, NULL);
1399 #ifdef LEAF_REG_REMAP
1400 if (current_function_uses_only_leaf_regs)
1401 leaf_renumber_regs (first);
1404 /* The Sun386i and perhaps other machines don't work right
1405 if the profiling code comes after the prologue. */
1406 #ifdef PROFILE_BEFORE_PROLOGUE
1407 if (current_function_profile)
1408 profile_function (file);
1409 #endif /* PROFILE_BEFORE_PROLOGUE */
1411 #if defined (DWARF2_UNWIND_INFO) && defined (HAVE_prologue)
1412 if (dwarf2out_do_frame ())
1413 dwarf2out_frame_debug (NULL_RTX, false);
1416 /* If debugging, assign block numbers to all of the blocks in this
1420 remove_unnecessary_notes ();
1421 reemit_insn_block_notes ();
1422 number_blocks (current_function_decl);
1423 /* We never actually put out begin/end notes for the top-level
1424 block in the function. But, conceptually, that block is
1426 TREE_ASM_WRITTEN (DECL_INITIAL (current_function_decl)) = 1;
1429 /* First output the function prologue: code to set up the stack frame. */
1430 targetm.asm_out.function_prologue (file, get_frame_size ());
1432 /* If the machine represents the prologue as RTL, the profiling code must
1433 be emitted when NOTE_INSN_PROLOGUE_END is scanned. */
1434 #ifdef HAVE_prologue
1435 if (! HAVE_prologue)
1437 profile_after_prologue (file);
1441 profile_after_prologue (FILE *file ATTRIBUTE_UNUSED)
1443 #ifndef PROFILE_BEFORE_PROLOGUE
1444 if (current_function_profile)
1445 profile_function (file);
1446 #endif /* not PROFILE_BEFORE_PROLOGUE */
1450 profile_function (FILE *file ATTRIBUTE_UNUSED)
1452 #ifndef NO_PROFILE_COUNTERS
1453 # define NO_PROFILE_COUNTERS 0
1455 #if defined(ASM_OUTPUT_REG_PUSH)
1456 int sval = current_function_returns_struct;
1457 rtx svrtx = targetm.calls.struct_value_rtx (TREE_TYPE (current_function_decl), 1);
1458 #if defined(STATIC_CHAIN_INCOMING_REGNUM) || defined(STATIC_CHAIN_REGNUM)
1459 int cxt = cfun->static_chain_decl != NULL;
1461 #endif /* ASM_OUTPUT_REG_PUSH */
1463 if (! NO_PROFILE_COUNTERS)
1465 int align = MIN (BIGGEST_ALIGNMENT, LONG_TYPE_SIZE);
1466 switch_to_section (data_section);
1467 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
1468 targetm.asm_out.internal_label (file, "LP", current_function_funcdef_no);
1469 assemble_integer (const0_rtx, LONG_TYPE_SIZE / BITS_PER_UNIT, align, 1);
1472 switch_to_section (current_function_section ());
1474 #if defined(ASM_OUTPUT_REG_PUSH)
1475 if (sval && svrtx != NULL_RTX && REG_P (svrtx))
1476 ASM_OUTPUT_REG_PUSH (file, REGNO (svrtx));
1479 #if defined(STATIC_CHAIN_INCOMING_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1481 ASM_OUTPUT_REG_PUSH (file, STATIC_CHAIN_INCOMING_REGNUM);
1483 #if defined(STATIC_CHAIN_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1486 ASM_OUTPUT_REG_PUSH (file, STATIC_CHAIN_REGNUM);
1491 FUNCTION_PROFILER (file, current_function_funcdef_no);
1493 #if defined(STATIC_CHAIN_INCOMING_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1495 ASM_OUTPUT_REG_POP (file, STATIC_CHAIN_INCOMING_REGNUM);
1497 #if defined(STATIC_CHAIN_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1500 ASM_OUTPUT_REG_POP (file, STATIC_CHAIN_REGNUM);
1505 #if defined(ASM_OUTPUT_REG_PUSH)
1506 if (sval && svrtx != NULL_RTX && REG_P (svrtx))
1507 ASM_OUTPUT_REG_POP (file, REGNO (svrtx));
1511 /* Output assembler code for the end of a function.
1512 For clarity, args are same as those of `final_start_function'
1513 even though not all of them are needed. */
1516 final_end_function (void)
1520 (*debug_hooks->end_function) (high_function_linenum);
1522 /* Finally, output the function epilogue:
1523 code to restore the stack frame and return to the caller. */
1524 targetm.asm_out.function_epilogue (asm_out_file, get_frame_size ());
1526 /* And debug output. */
1527 (*debug_hooks->end_epilogue) (last_linenum, last_filename);
1529 #if defined (DWARF2_UNWIND_INFO)
1530 if (write_symbols != DWARF2_DEBUG && write_symbols != VMS_AND_DWARF2_DEBUG
1531 && dwarf2out_do_frame ())
1532 dwarf2out_end_epilogue (last_linenum, last_filename);
1536 /* Output assembler code for some insns: all or part of a function.
1537 For description of args, see `final_start_function', above. */
1540 final (rtx first, FILE *file, int optimize)
1546 last_ignored_compare = 0;
1548 #ifdef SDB_DEBUGGING_INFO
1549 /* When producing SDB debugging info, delete troublesome line number
1550 notes from inlined functions in other files as well as duplicate
1551 line number notes. */
1552 if (write_symbols == SDB_DEBUG)
1555 for (insn = first; insn; insn = NEXT_INSN (insn))
1556 if (NOTE_P (insn) && NOTE_LINE_NUMBER (insn) > 0)
1559 #ifdef USE_MAPPED_LOCATION
1560 && NOTE_SOURCE_LOCATION (insn) == NOTE_SOURCE_LOCATION (last)
1562 && NOTE_LINE_NUMBER (insn) == NOTE_LINE_NUMBER (last)
1563 && NOTE_SOURCE_FILE (insn) == NOTE_SOURCE_FILE (last)
1567 delete_insn (insn); /* Use delete_note. */
1575 for (insn = first; insn; insn = NEXT_INSN (insn))
1577 if (INSN_UID (insn) > max_uid) /* Find largest UID. */
1578 max_uid = INSN_UID (insn);
1580 /* If CC tracking across branches is enabled, record the insn which
1581 jumps to each branch only reached from one place. */
1582 if (optimize && JUMP_P (insn))
1584 rtx lab = JUMP_LABEL (insn);
1585 if (lab && LABEL_NUSES (lab) == 1)
1587 LABEL_REFS (lab) = insn;
1597 /* Output the insns. */
1598 for (insn = NEXT_INSN (first); insn;)
1600 #ifdef HAVE_ATTR_length
1601 if ((unsigned) INSN_UID (insn) >= INSN_ADDRESSES_SIZE ())
1603 /* This can be triggered by bugs elsewhere in the compiler if
1604 new insns are created after init_insn_lengths is called. */
1605 gcc_assert (NOTE_P (insn));
1606 insn_current_address = -1;
1609 insn_current_address = INSN_ADDRESSES (INSN_UID (insn));
1610 #endif /* HAVE_ATTR_length */
1612 insn = final_scan_insn (insn, file, optimize, 0, &seen);
1617 get_insn_template (int code, rtx insn)
1619 switch (insn_data[code].output_format)
1621 case INSN_OUTPUT_FORMAT_SINGLE:
1622 return insn_data[code].output.single;
1623 case INSN_OUTPUT_FORMAT_MULTI:
1624 return insn_data[code].output.multi[which_alternative];
1625 case INSN_OUTPUT_FORMAT_FUNCTION:
1627 return (*insn_data[code].output.function) (recog_data.operand, insn);
1634 /* Emit the appropriate declaration for an alternate-entry-point
1635 symbol represented by INSN, to FILE. INSN is a CODE_LABEL with
1636 LABEL_KIND != LABEL_NORMAL.
1638 The case fall-through in this function is intentional. */
1640 output_alternate_entry_point (FILE *file, rtx insn)
1642 const char *name = LABEL_NAME (insn);
1644 switch (LABEL_KIND (insn))
1646 case LABEL_WEAK_ENTRY:
1647 #ifdef ASM_WEAKEN_LABEL
1648 ASM_WEAKEN_LABEL (file, name);
1650 case LABEL_GLOBAL_ENTRY:
1651 targetm.asm_out.globalize_label (file, name);
1652 case LABEL_STATIC_ENTRY:
1653 #ifdef ASM_OUTPUT_TYPE_DIRECTIVE
1654 ASM_OUTPUT_TYPE_DIRECTIVE (file, name, "function");
1656 ASM_OUTPUT_LABEL (file, name);
1665 /* The final scan for one insn, INSN.
1666 Args are same as in `final', except that INSN
1667 is the insn being scanned.
1668 Value returned is the next insn to be scanned.
1670 NOPEEPHOLES is the flag to disallow peephole processing (currently
1671 used for within delayed branch sequence output).
1673 SEEN is used to track the end of the prologue, for emitting
1674 debug information. We force the emission of a line note after
1675 both NOTE_INSN_PROLOGUE_END and NOTE_INSN_FUNCTION_BEG, or
1676 at the beginning of the second basic block, whichever comes
1680 final_scan_insn (rtx insn, FILE *file, int optimize ATTRIBUTE_UNUSED,
1681 int nopeepholes ATTRIBUTE_UNUSED, int *seen)
1690 /* Ignore deleted insns. These can occur when we split insns (due to a
1691 template of "#") while not optimizing. */
1692 if (INSN_DELETED_P (insn))
1693 return NEXT_INSN (insn);
1695 switch (GET_CODE (insn))
1698 switch (NOTE_LINE_NUMBER (insn))
1700 case NOTE_INSN_DELETED:
1701 case NOTE_INSN_LOOP_BEG:
1702 case NOTE_INSN_LOOP_END:
1703 case NOTE_INSN_FUNCTION_END:
1704 case NOTE_INSN_REPEATED_LINE_NUMBER:
1705 case NOTE_INSN_EXPECTED_VALUE:
1708 case NOTE_INSN_SWITCH_TEXT_SECTIONS:
1709 in_cold_section_p = !in_cold_section_p;
1710 (*debug_hooks->switch_text_section) ();
1711 switch_to_section (current_function_section ());
1714 case NOTE_INSN_BASIC_BLOCK:
1716 #ifdef TARGET_UNWIND_INFO
1717 targetm.asm_out.unwind_emit (asm_out_file, insn);
1721 fprintf (asm_out_file, "\t%s basic block %d\n",
1722 ASM_COMMENT_START, NOTE_BASIC_BLOCK (insn)->index);
1724 if ((*seen & (SEEN_EMITTED | SEEN_BB)) == SEEN_BB)
1726 *seen |= SEEN_EMITTED;
1727 force_source_line = true;
1734 case NOTE_INSN_EH_REGION_BEG:
1735 ASM_OUTPUT_DEBUG_LABEL (asm_out_file, "LEHB",
1736 NOTE_EH_HANDLER (insn));
1739 case NOTE_INSN_EH_REGION_END:
1740 ASM_OUTPUT_DEBUG_LABEL (asm_out_file, "LEHE",
1741 NOTE_EH_HANDLER (insn));
1744 case NOTE_INSN_PROLOGUE_END:
1745 targetm.asm_out.function_end_prologue (file);
1746 profile_after_prologue (file);
1748 if ((*seen & (SEEN_EMITTED | SEEN_NOTE)) == SEEN_NOTE)
1750 *seen |= SEEN_EMITTED;
1751 force_source_line = true;
1758 case NOTE_INSN_EPILOGUE_BEG:
1759 targetm.asm_out.function_begin_epilogue (file);
1762 case NOTE_INSN_FUNCTION_BEG:
1764 (*debug_hooks->end_prologue) (last_linenum, last_filename);
1766 if ((*seen & (SEEN_EMITTED | SEEN_NOTE)) == SEEN_NOTE)
1768 *seen |= SEEN_EMITTED;
1769 force_source_line = true;
1776 case NOTE_INSN_BLOCK_BEG:
1777 if (debug_info_level == DINFO_LEVEL_NORMAL
1778 || debug_info_level == DINFO_LEVEL_VERBOSE
1779 || write_symbols == DWARF2_DEBUG
1780 || write_symbols == VMS_AND_DWARF2_DEBUG
1781 || write_symbols == VMS_DEBUG)
1783 int n = BLOCK_NUMBER (NOTE_BLOCK (insn));
1787 high_block_linenum = last_linenum;
1789 /* Output debugging info about the symbol-block beginning. */
1790 (*debug_hooks->begin_block) (last_linenum, n);
1792 /* Mark this block as output. */
1793 TREE_ASM_WRITTEN (NOTE_BLOCK (insn)) = 1;
1797 case NOTE_INSN_BLOCK_END:
1798 if (debug_info_level == DINFO_LEVEL_NORMAL
1799 || debug_info_level == DINFO_LEVEL_VERBOSE
1800 || write_symbols == DWARF2_DEBUG
1801 || write_symbols == VMS_AND_DWARF2_DEBUG
1802 || write_symbols == VMS_DEBUG)
1804 int n = BLOCK_NUMBER (NOTE_BLOCK (insn));
1808 /* End of a symbol-block. */
1810 gcc_assert (block_depth >= 0);
1812 (*debug_hooks->end_block) (high_block_linenum, n);
1816 case NOTE_INSN_DELETED_LABEL:
1817 /* Emit the label. We may have deleted the CODE_LABEL because
1818 the label could be proved to be unreachable, though still
1819 referenced (in the form of having its address taken. */
1820 ASM_OUTPUT_DEBUG_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
1823 case NOTE_INSN_VAR_LOCATION:
1824 (*debug_hooks->var_location) (insn);
1831 gcc_assert (NOTE_LINE_NUMBER (insn) > 0);
1837 #if defined (DWARF2_UNWIND_INFO)
1838 if (dwarf2out_do_frame ())
1839 dwarf2out_frame_debug (insn, false);
1844 /* The target port might emit labels in the output function for
1845 some insn, e.g. sh.c output_branchy_insn. */
1846 if (CODE_LABEL_NUMBER (insn) <= max_labelno)
1848 int align = LABEL_TO_ALIGNMENT (insn);
1849 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1850 int max_skip = LABEL_TO_MAX_SKIP (insn);
1853 if (align && NEXT_INSN (insn))
1855 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1856 ASM_OUTPUT_MAX_SKIP_ALIGN (file, align, max_skip);
1858 #ifdef ASM_OUTPUT_ALIGN_WITH_NOP
1859 ASM_OUTPUT_ALIGN_WITH_NOP (file, align);
1861 ASM_OUTPUT_ALIGN (file, align);
1868 /* If this label is reached from only one place, set the condition
1869 codes from the instruction just before the branch. */
1871 /* Disabled because some insns set cc_status in the C output code
1872 and NOTICE_UPDATE_CC alone can set incorrect status. */
1873 if (0 /* optimize && LABEL_NUSES (insn) == 1*/)
1875 rtx jump = LABEL_REFS (insn);
1876 rtx barrier = prev_nonnote_insn (insn);
1878 /* If the LABEL_REFS field of this label has been set to point
1879 at a branch, the predecessor of the branch is a regular
1880 insn, and that branch is the only way to reach this label,
1881 set the condition codes based on the branch and its
1883 if (barrier && BARRIER_P (barrier)
1884 && jump && JUMP_P (jump)
1885 && (prev = prev_nonnote_insn (jump))
1886 && NONJUMP_INSN_P (prev))
1888 NOTICE_UPDATE_CC (PATTERN (prev), prev);
1889 NOTICE_UPDATE_CC (PATTERN (jump), jump);
1894 if (LABEL_NAME (insn))
1895 (*debug_hooks->label) (insn);
1899 fputs (ASM_APP_OFF, file);
1903 next = next_nonnote_insn (insn);
1904 if (next != 0 && JUMP_P (next))
1906 rtx nextbody = PATTERN (next);
1908 /* If this label is followed by a jump-table,
1909 make sure we put the label in the read-only section. Also
1910 possibly write the label and jump table together. */
1912 if (GET_CODE (nextbody) == ADDR_VEC
1913 || GET_CODE (nextbody) == ADDR_DIFF_VEC)
1915 #if defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC)
1916 /* In this case, the case vector is being moved by the
1917 target, so don't output the label at all. Leave that
1918 to the back end macros. */
1920 if (! JUMP_TABLES_IN_TEXT_SECTION)
1924 switch_to_section (targetm.asm_out.function_rodata_section
1925 (current_function_decl));
1927 #ifdef ADDR_VEC_ALIGN
1928 log_align = ADDR_VEC_ALIGN (next);
1930 log_align = exact_log2 (BIGGEST_ALIGNMENT / BITS_PER_UNIT);
1932 ASM_OUTPUT_ALIGN (file, log_align);
1935 switch_to_section (current_function_section ());
1937 #ifdef ASM_OUTPUT_CASE_LABEL
1938 ASM_OUTPUT_CASE_LABEL (file, "L", CODE_LABEL_NUMBER (insn),
1941 targetm.asm_out.internal_label (file, "L", CODE_LABEL_NUMBER (insn));
1947 if (LABEL_ALT_ENTRY_P (insn))
1948 output_alternate_entry_point (file, insn);
1950 targetm.asm_out.internal_label (file, "L", CODE_LABEL_NUMBER (insn));
1955 rtx body = PATTERN (insn);
1956 int insn_code_number;
1957 const char *template;
1959 /* An INSN, JUMP_INSN or CALL_INSN.
1960 First check for special kinds that recog doesn't recognize. */
1962 if (GET_CODE (body) == USE /* These are just declarations. */
1963 || GET_CODE (body) == CLOBBER)
1968 /* If there is a REG_CC_SETTER note on this insn, it means that
1969 the setting of the condition code was done in the delay slot
1970 of the insn that branched here. So recover the cc status
1971 from the insn that set it. */
1973 rtx note = find_reg_note (insn, REG_CC_SETTER, NULL_RTX);
1976 NOTICE_UPDATE_CC (PATTERN (XEXP (note, 0)), XEXP (note, 0));
1977 cc_prev_status = cc_status;
1982 /* Detect insns that are really jump-tables
1983 and output them as such. */
1985 if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
1987 #if !(defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC))
1991 if (! JUMP_TABLES_IN_TEXT_SECTION)
1992 switch_to_section (targetm.asm_out.function_rodata_section
1993 (current_function_decl));
1995 switch_to_section (current_function_section ());
1999 fputs (ASM_APP_OFF, file);
2003 #if defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC)
2004 if (GET_CODE (body) == ADDR_VEC)
2006 #ifdef ASM_OUTPUT_ADDR_VEC
2007 ASM_OUTPUT_ADDR_VEC (PREV_INSN (insn), body);
2014 #ifdef ASM_OUTPUT_ADDR_DIFF_VEC
2015 ASM_OUTPUT_ADDR_DIFF_VEC (PREV_INSN (insn), body);
2021 vlen = XVECLEN (body, GET_CODE (body) == ADDR_DIFF_VEC);
2022 for (idx = 0; idx < vlen; idx++)
2024 if (GET_CODE (body) == ADDR_VEC)
2026 #ifdef ASM_OUTPUT_ADDR_VEC_ELT
2027 ASM_OUTPUT_ADDR_VEC_ELT
2028 (file, CODE_LABEL_NUMBER (XEXP (XVECEXP (body, 0, idx), 0)));
2035 #ifdef ASM_OUTPUT_ADDR_DIFF_ELT
2036 ASM_OUTPUT_ADDR_DIFF_ELT
2039 CODE_LABEL_NUMBER (XEXP (XVECEXP (body, 1, idx), 0)),
2040 CODE_LABEL_NUMBER (XEXP (XEXP (body, 0), 0)));
2046 #ifdef ASM_OUTPUT_CASE_END
2047 ASM_OUTPUT_CASE_END (file,
2048 CODE_LABEL_NUMBER (PREV_INSN (insn)),
2053 switch_to_section (current_function_section ());
2057 /* Output this line note if it is the first or the last line
2059 if (notice_source_line (insn))
2061 (*debug_hooks->source_line) (last_linenum, last_filename);
2064 if (GET_CODE (body) == ASM_INPUT)
2066 const char *string = XSTR (body, 0);
2068 /* There's no telling what that did to the condition codes. */
2075 fputs (ASM_APP_ON, file);
2078 fprintf (asm_out_file, "\t%s\n", string);
2083 /* Detect `asm' construct with operands. */
2084 if (asm_noperands (body) >= 0)
2086 unsigned int noperands = asm_noperands (body);
2087 rtx *ops = alloca (noperands * sizeof (rtx));
2090 /* There's no telling what that did to the condition codes. */
2093 /* Get out the operand values. */
2094 string = decode_asm_operands (body, ops, NULL, NULL, NULL);
2095 /* Inhibit dieing on what would otherwise be compiler bugs. */
2096 insn_noperands = noperands;
2097 this_is_asm_operands = insn;
2099 #ifdef FINAL_PRESCAN_INSN
2100 FINAL_PRESCAN_INSN (insn, ops, insn_noperands);
2103 /* Output the insn using them. */
2108 fputs (ASM_APP_ON, file);
2111 output_asm_insn (string, ops);
2114 this_is_asm_operands = 0;
2120 fputs (ASM_APP_OFF, file);
2124 if (GET_CODE (body) == SEQUENCE)
2126 /* A delayed-branch sequence */
2129 final_sequence = body;
2131 /* Record the delay slots' frame information before the branch.
2132 This is needed for delayed calls: see execute_cfa_program(). */
2133 #if defined (DWARF2_UNWIND_INFO)
2134 if (dwarf2out_do_frame ())
2135 for (i = 1; i < XVECLEN (body, 0); i++)
2136 dwarf2out_frame_debug (XVECEXP (body, 0, i), false);
2139 /* The first insn in this SEQUENCE might be a JUMP_INSN that will
2140 force the restoration of a comparison that was previously
2141 thought unnecessary. If that happens, cancel this sequence
2142 and cause that insn to be restored. */
2144 next = final_scan_insn (XVECEXP (body, 0, 0), file, 0, 1, seen);
2145 if (next != XVECEXP (body, 0, 1))
2151 for (i = 1; i < XVECLEN (body, 0); i++)
2153 rtx insn = XVECEXP (body, 0, i);
2154 rtx next = NEXT_INSN (insn);
2155 /* We loop in case any instruction in a delay slot gets
2158 insn = final_scan_insn (insn, file, 0, 1, seen);
2159 while (insn != next);
2161 #ifdef DBR_OUTPUT_SEQEND
2162 DBR_OUTPUT_SEQEND (file);
2166 /* If the insn requiring the delay slot was a CALL_INSN, the
2167 insns in the delay slot are actually executed before the
2168 called function. Hence we don't preserve any CC-setting
2169 actions in these insns and the CC must be marked as being
2170 clobbered by the function. */
2171 if (CALL_P (XVECEXP (body, 0, 0)))
2178 /* We have a real machine instruction as rtl. */
2180 body = PATTERN (insn);
2183 set = single_set (insn);
2185 /* Check for redundant test and compare instructions
2186 (when the condition codes are already set up as desired).
2187 This is done only when optimizing; if not optimizing,
2188 it should be possible for the user to alter a variable
2189 with the debugger in between statements
2190 and the next statement should reexamine the variable
2191 to compute the condition codes. */
2196 && GET_CODE (SET_DEST (set)) == CC0
2197 && insn != last_ignored_compare)
2199 if (GET_CODE (SET_SRC (set)) == SUBREG)
2200 SET_SRC (set) = alter_subreg (&SET_SRC (set));
2201 else if (GET_CODE (SET_SRC (set)) == COMPARE)
2203 if (GET_CODE (XEXP (SET_SRC (set), 0)) == SUBREG)
2204 XEXP (SET_SRC (set), 0)
2205 = alter_subreg (&XEXP (SET_SRC (set), 0));
2206 if (GET_CODE (XEXP (SET_SRC (set), 1)) == SUBREG)
2207 XEXP (SET_SRC (set), 1)
2208 = alter_subreg (&XEXP (SET_SRC (set), 1));
2210 if ((cc_status.value1 != 0
2211 && rtx_equal_p (SET_SRC (set), cc_status.value1))
2212 || (cc_status.value2 != 0
2213 && rtx_equal_p (SET_SRC (set), cc_status.value2)))
2215 /* Don't delete insn if it has an addressing side-effect. */
2216 if (! FIND_REG_INC_NOTE (insn, NULL_RTX)
2217 /* or if anything in it is volatile. */
2218 && ! volatile_refs_p (PATTERN (insn)))
2220 /* We don't really delete the insn; just ignore it. */
2221 last_ignored_compare = insn;
2230 /* If this is a conditional branch, maybe modify it
2231 if the cc's are in a nonstandard state
2232 so that it accomplishes the same thing that it would
2233 do straightforwardly if the cc's were set up normally. */
2235 if (cc_status.flags != 0
2237 && GET_CODE (body) == SET
2238 && SET_DEST (body) == pc_rtx
2239 && GET_CODE (SET_SRC (body)) == IF_THEN_ELSE
2240 && COMPARISON_P (XEXP (SET_SRC (body), 0))
2241 && XEXP (XEXP (SET_SRC (body), 0), 0) == cc0_rtx)
2243 /* This function may alter the contents of its argument
2244 and clear some of the cc_status.flags bits.
2245 It may also return 1 meaning condition now always true
2246 or -1 meaning condition now always false
2247 or 2 meaning condition nontrivial but altered. */
2248 int result = alter_cond (XEXP (SET_SRC (body), 0));
2249 /* If condition now has fixed value, replace the IF_THEN_ELSE
2250 with its then-operand or its else-operand. */
2252 SET_SRC (body) = XEXP (SET_SRC (body), 1);
2254 SET_SRC (body) = XEXP (SET_SRC (body), 2);
2256 /* The jump is now either unconditional or a no-op.
2257 If it has become a no-op, don't try to output it.
2258 (It would not be recognized.) */
2259 if (SET_SRC (body) == pc_rtx)
2264 else if (GET_CODE (SET_SRC (body)) == RETURN)
2265 /* Replace (set (pc) (return)) with (return). */
2266 PATTERN (insn) = body = SET_SRC (body);
2268 /* Rerecognize the instruction if it has changed. */
2270 INSN_CODE (insn) = -1;
2273 /* Make same adjustments to instructions that examine the
2274 condition codes without jumping and instructions that
2275 handle conditional moves (if this machine has either one). */
2277 if (cc_status.flags != 0
2280 rtx cond_rtx, then_rtx, else_rtx;
2283 && GET_CODE (SET_SRC (set)) == IF_THEN_ELSE)
2285 cond_rtx = XEXP (SET_SRC (set), 0);
2286 then_rtx = XEXP (SET_SRC (set), 1);
2287 else_rtx = XEXP (SET_SRC (set), 2);
2291 cond_rtx = SET_SRC (set);
2292 then_rtx = const_true_rtx;
2293 else_rtx = const0_rtx;
2296 switch (GET_CODE (cond_rtx))
2310 if (XEXP (cond_rtx, 0) != cc0_rtx)
2312 result = alter_cond (cond_rtx);
2314 validate_change (insn, &SET_SRC (set), then_rtx, 0);
2315 else if (result == -1)
2316 validate_change (insn, &SET_SRC (set), else_rtx, 0);
2317 else if (result == 2)
2318 INSN_CODE (insn) = -1;
2319 if (SET_DEST (set) == SET_SRC (set))
2331 #ifdef HAVE_peephole
2332 /* Do machine-specific peephole optimizations if desired. */
2334 if (optimize && !flag_no_peephole && !nopeepholes)
2336 rtx next = peephole (insn);
2337 /* When peepholing, if there were notes within the peephole,
2338 emit them before the peephole. */
2339 if (next != 0 && next != NEXT_INSN (insn))
2341 rtx note, prev = PREV_INSN (insn);
2343 for (note = NEXT_INSN (insn); note != next;
2344 note = NEXT_INSN (note))
2345 final_scan_insn (note, file, optimize, nopeepholes, seen);
2347 /* Put the notes in the proper position for a later
2348 rescan. For example, the SH target can do this
2349 when generating a far jump in a delayed branch
2351 note = NEXT_INSN (insn);
2352 PREV_INSN (note) = prev;
2353 NEXT_INSN (prev) = note;
2354 NEXT_INSN (PREV_INSN (next)) = insn;
2355 PREV_INSN (insn) = PREV_INSN (next);
2356 NEXT_INSN (insn) = next;
2357 PREV_INSN (next) = insn;
2360 /* PEEPHOLE might have changed this. */
2361 body = PATTERN (insn);
2365 /* Try to recognize the instruction.
2366 If successful, verify that the operands satisfy the
2367 constraints for the instruction. Crash if they don't,
2368 since `reload' should have changed them so that they do. */
2370 insn_code_number = recog_memoized (insn);
2371 cleanup_subreg_operands (insn);
2373 /* Dump the insn in the assembly for debugging. */
2374 if (flag_dump_rtl_in_asm)
2376 print_rtx_head = ASM_COMMENT_START;
2377 print_rtl_single (asm_out_file, insn);
2378 print_rtx_head = "";
2381 if (! constrain_operands_cached (1))
2382 fatal_insn_not_found (insn);
2384 /* Some target machines need to prescan each insn before
2387 #ifdef FINAL_PRESCAN_INSN
2388 FINAL_PRESCAN_INSN (insn, recog_data.operand, recog_data.n_operands);
2391 #ifdef HAVE_conditional_execution
2392 if (GET_CODE (PATTERN (insn)) == COND_EXEC)
2393 current_insn_predicate = COND_EXEC_TEST (PATTERN (insn));
2395 current_insn_predicate = NULL_RTX;
2399 cc_prev_status = cc_status;
2401 /* Update `cc_status' for this instruction.
2402 The instruction's output routine may change it further.
2403 If the output routine for a jump insn needs to depend
2404 on the cc status, it should look at cc_prev_status. */
2406 NOTICE_UPDATE_CC (body, insn);
2409 current_output_insn = debug_insn = insn;
2411 #if defined (DWARF2_UNWIND_INFO)
2412 if (CALL_P (insn) && dwarf2out_do_frame ())
2413 dwarf2out_frame_debug (insn, false);
2416 /* Find the proper template for this insn. */
2417 template = get_insn_template (insn_code_number, insn);
2419 /* If the C code returns 0, it means that it is a jump insn
2420 which follows a deleted test insn, and that test insn
2421 needs to be reinserted. */
2426 gcc_assert (prev_nonnote_insn (insn) == last_ignored_compare);
2428 /* We have already processed the notes between the setter and
2429 the user. Make sure we don't process them again, this is
2430 particularly important if one of the notes is a block
2431 scope note or an EH note. */
2433 prev != last_ignored_compare;
2434 prev = PREV_INSN (prev))
2437 delete_insn (prev); /* Use delete_note. */
2443 /* If the template is the string "#", it means that this insn must
2445 if (template[0] == '#' && template[1] == '\0')
2447 rtx new = try_split (body, insn, 0);
2449 /* If we didn't split the insn, go away. */
2450 if (new == insn && PATTERN (new) == body)
2451 fatal_insn ("could not split insn", insn);
2453 #ifdef HAVE_ATTR_length
2454 /* This instruction should have been split in shorten_branches,
2455 to ensure that we would have valid length info for the
2463 #ifdef TARGET_UNWIND_INFO
2464 /* ??? This will put the directives in the wrong place if
2465 get_insn_template outputs assembly directly. However calling it
2466 before get_insn_template breaks if the insns is split. */
2467 targetm.asm_out.unwind_emit (asm_out_file, insn);
2470 /* Output assembler code from the template. */
2471 output_asm_insn (template, recog_data.operand);
2473 /* If necessary, report the effect that the instruction has on
2474 the unwind info. We've already done this for delay slots
2475 and call instructions. */
2476 #if defined (DWARF2_UNWIND_INFO)
2477 if (final_sequence == 0
2478 #if !defined (HAVE_prologue)
2479 && !ACCUMULATE_OUTGOING_ARGS
2481 && dwarf2out_do_frame ())
2482 dwarf2out_frame_debug (insn, true);
2485 current_output_insn = debug_insn = 0;
2488 return NEXT_INSN (insn);
2491 /* Return whether a source line note needs to be emitted before INSN. */
2494 notice_source_line (rtx insn)
2496 const char *filename = insn_file (insn);
2497 int linenum = insn_line (insn);
2500 && (force_source_line
2501 || filename != last_filename
2502 || last_linenum != linenum))
2504 force_source_line = false;
2505 last_filename = filename;
2506 last_linenum = linenum;
2507 high_block_linenum = MAX (last_linenum, high_block_linenum);
2508 high_function_linenum = MAX (last_linenum, high_function_linenum);
2514 /* For each operand in INSN, simplify (subreg (reg)) so that it refers
2515 directly to the desired hard register. */
2518 cleanup_subreg_operands (rtx insn)
2521 extract_insn_cached (insn);
2522 for (i = 0; i < recog_data.n_operands; i++)
2524 /* The following test cannot use recog_data.operand when testing
2525 for a SUBREG: the underlying object might have been changed
2526 already if we are inside a match_operator expression that
2527 matches the else clause. Instead we test the underlying
2528 expression directly. */
2529 if (GET_CODE (*recog_data.operand_loc[i]) == SUBREG)
2530 recog_data.operand[i] = alter_subreg (recog_data.operand_loc[i]);
2531 else if (GET_CODE (recog_data.operand[i]) == PLUS
2532 || GET_CODE (recog_data.operand[i]) == MULT
2533 || MEM_P (recog_data.operand[i]))
2534 recog_data.operand[i] = walk_alter_subreg (recog_data.operand_loc[i]);
2537 for (i = 0; i < recog_data.n_dups; i++)
2539 if (GET_CODE (*recog_data.dup_loc[i]) == SUBREG)
2540 *recog_data.dup_loc[i] = alter_subreg (recog_data.dup_loc[i]);
2541 else if (GET_CODE (*recog_data.dup_loc[i]) == PLUS
2542 || GET_CODE (*recog_data.dup_loc[i]) == MULT
2543 || MEM_P (*recog_data.dup_loc[i]))
2544 *recog_data.dup_loc[i] = walk_alter_subreg (recog_data.dup_loc[i]);
2548 /* If X is a SUBREG, replace it with a REG or a MEM,
2549 based on the thing it is a subreg of. */
2552 alter_subreg (rtx *xp)
2555 rtx y = SUBREG_REG (x);
2557 /* simplify_subreg does not remove subreg from volatile references.
2558 We are required to. */
2561 int offset = SUBREG_BYTE (x);
2563 /* For paradoxical subregs on big-endian machines, SUBREG_BYTE
2564 contains 0 instead of the proper offset. See simplify_subreg. */
2566 && GET_MODE_SIZE (GET_MODE (y)) < GET_MODE_SIZE (GET_MODE (x)))
2568 int difference = GET_MODE_SIZE (GET_MODE (y))
2569 - GET_MODE_SIZE (GET_MODE (x));
2570 if (WORDS_BIG_ENDIAN)
2571 offset += (difference / UNITS_PER_WORD) * UNITS_PER_WORD;
2572 if (BYTES_BIG_ENDIAN)
2573 offset += difference % UNITS_PER_WORD;
2576 *xp = adjust_address (y, GET_MODE (x), offset);
2580 rtx new = simplify_subreg (GET_MODE (x), y, GET_MODE (y),
2587 /* Simplify_subreg can't handle some REG cases, but we have to. */
2588 unsigned int regno = subreg_regno (x);
2589 *xp = gen_rtx_REG_offset (y, GET_MODE (x), regno, SUBREG_BYTE (x));
2596 /* Do alter_subreg on all the SUBREGs contained in X. */
2599 walk_alter_subreg (rtx *xp)
2602 switch (GET_CODE (x))
2607 XEXP (x, 0) = walk_alter_subreg (&XEXP (x, 0));
2608 XEXP (x, 1) = walk_alter_subreg (&XEXP (x, 1));
2613 XEXP (x, 0) = walk_alter_subreg (&XEXP (x, 0));
2617 return alter_subreg (xp);
2628 /* Given BODY, the body of a jump instruction, alter the jump condition
2629 as required by the bits that are set in cc_status.flags.
2630 Not all of the bits there can be handled at this level in all cases.
2632 The value is normally 0.
2633 1 means that the condition has become always true.
2634 -1 means that the condition has become always false.
2635 2 means that COND has been altered. */
2638 alter_cond (rtx cond)
2642 if (cc_status.flags & CC_REVERSED)
2645 PUT_CODE (cond, swap_condition (GET_CODE (cond)));
2648 if (cc_status.flags & CC_INVERTED)
2651 PUT_CODE (cond, reverse_condition (GET_CODE (cond)));
2654 if (cc_status.flags & CC_NOT_POSITIVE)
2655 switch (GET_CODE (cond))
2660 /* Jump becomes unconditional. */
2666 /* Jump becomes no-op. */
2670 PUT_CODE (cond, EQ);
2675 PUT_CODE (cond, NE);
2683 if (cc_status.flags & CC_NOT_NEGATIVE)
2684 switch (GET_CODE (cond))
2688 /* Jump becomes unconditional. */
2693 /* Jump becomes no-op. */
2698 PUT_CODE (cond, EQ);
2704 PUT_CODE (cond, NE);
2712 if (cc_status.flags & CC_NO_OVERFLOW)
2713 switch (GET_CODE (cond))
2716 /* Jump becomes unconditional. */
2720 PUT_CODE (cond, EQ);
2725 PUT_CODE (cond, NE);
2730 /* Jump becomes no-op. */
2737 if (cc_status.flags & (CC_Z_IN_NOT_N | CC_Z_IN_N))
2738 switch (GET_CODE (cond))
2744 PUT_CODE (cond, cc_status.flags & CC_Z_IN_N ? GE : LT);
2749 PUT_CODE (cond, cc_status.flags & CC_Z_IN_N ? LT : GE);
2754 if (cc_status.flags & CC_NOT_SIGNED)
2755 /* The flags are valid if signed condition operators are converted
2757 switch (GET_CODE (cond))
2760 PUT_CODE (cond, LEU);
2765 PUT_CODE (cond, LTU);
2770 PUT_CODE (cond, GTU);
2775 PUT_CODE (cond, GEU);
2787 /* Report inconsistency between the assembler template and the operands.
2788 In an `asm', it's the user's fault; otherwise, the compiler's fault. */
2791 output_operand_lossage (const char *cmsgid, ...)
2795 const char *pfx_str;
2798 va_start (ap, cmsgid);
2800 pfx_str = this_is_asm_operands ? _("invalid 'asm': ") : "output_operand: ";
2801 asprintf (&fmt_string, "%s%s", pfx_str, _(cmsgid));
2802 vasprintf (&new_message, fmt_string, ap);
2804 if (this_is_asm_operands)
2805 error_for_asm (this_is_asm_operands, "%s", new_message);
2807 internal_error ("%s", new_message);
2814 /* Output of assembler code from a template, and its subroutines. */
2816 /* Annotate the assembly with a comment describing the pattern and
2817 alternative used. */
2820 output_asm_name (void)
2824 int num = INSN_CODE (debug_insn);
2825 fprintf (asm_out_file, "\t%s %d\t%s",
2826 ASM_COMMENT_START, INSN_UID (debug_insn),
2827 insn_data[num].name);
2828 if (insn_data[num].n_alternatives > 1)
2829 fprintf (asm_out_file, "/%d", which_alternative + 1);
2830 #ifdef HAVE_ATTR_length
2831 fprintf (asm_out_file, "\t[length = %d]",
2832 get_attr_length (debug_insn));
2834 /* Clear this so only the first assembler insn
2835 of any rtl insn will get the special comment for -dp. */
2840 /* If OP is a REG or MEM and we can find a MEM_EXPR corresponding to it
2841 or its address, return that expr . Set *PADDRESSP to 1 if the expr
2842 corresponds to the address of the object and 0 if to the object. */
2845 get_mem_expr_from_op (rtx op, int *paddressp)
2853 return REG_EXPR (op);
2854 else if (!MEM_P (op))
2857 if (MEM_EXPR (op) != 0)
2858 return MEM_EXPR (op);
2860 /* Otherwise we have an address, so indicate it and look at the address. */
2864 /* First check if we have a decl for the address, then look at the right side
2865 if it is a PLUS. Otherwise, strip off arithmetic and keep looking.
2866 But don't allow the address to itself be indirect. */
2867 if ((expr = get_mem_expr_from_op (op, &inner_addressp)) && ! inner_addressp)
2869 else if (GET_CODE (op) == PLUS
2870 && (expr = get_mem_expr_from_op (XEXP (op, 1), &inner_addressp)))
2873 while (GET_RTX_CLASS (GET_CODE (op)) == RTX_UNARY
2874 || GET_RTX_CLASS (GET_CODE (op)) == RTX_BIN_ARITH)
2877 expr = get_mem_expr_from_op (op, &inner_addressp);
2878 return inner_addressp ? 0 : expr;
2881 /* Output operand names for assembler instructions. OPERANDS is the
2882 operand vector, OPORDER is the order to write the operands, and NOPS
2883 is the number of operands to write. */
2886 output_asm_operand_names (rtx *operands, int *oporder, int nops)
2891 for (i = 0; i < nops; i++)
2894 rtx op = operands[oporder[i]];
2895 tree expr = get_mem_expr_from_op (op, &addressp);
2897 fprintf (asm_out_file, "%c%s",
2898 wrote ? ',' : '\t', wrote ? "" : ASM_COMMENT_START);
2902 fprintf (asm_out_file, "%s",
2903 addressp ? "*" : "");
2904 print_mem_expr (asm_out_file, expr);
2907 else if (REG_P (op) && ORIGINAL_REGNO (op)
2908 && ORIGINAL_REGNO (op) != REGNO (op))
2909 fprintf (asm_out_file, " tmp%i", ORIGINAL_REGNO (op));
2913 /* Output text from TEMPLATE to the assembler output file,
2914 obeying %-directions to substitute operands taken from
2915 the vector OPERANDS.
2917 %N (for N a digit) means print operand N in usual manner.
2918 %lN means require operand N to be a CODE_LABEL or LABEL_REF
2919 and print the label name with no punctuation.
2920 %cN means require operand N to be a constant
2921 and print the constant expression with no punctuation.
2922 %aN means expect operand N to be a memory address
2923 (not a memory reference!) and print a reference
2925 %nN means expect operand N to be a constant
2926 and print a constant expression for minus the value
2927 of the operand, with no other punctuation. */
2930 output_asm_insn (const char *template, rtx *operands)
2934 #ifdef ASSEMBLER_DIALECT
2937 int oporder[MAX_RECOG_OPERANDS];
2938 char opoutput[MAX_RECOG_OPERANDS];
2941 /* An insn may return a null string template
2942 in a case where no assembler code is needed. */
2946 memset (opoutput, 0, sizeof opoutput);
2948 putc ('\t', asm_out_file);
2950 #ifdef ASM_OUTPUT_OPCODE
2951 ASM_OUTPUT_OPCODE (asm_out_file, p);
2958 if (flag_verbose_asm)
2959 output_asm_operand_names (operands, oporder, ops);
2960 if (flag_print_asm_name)
2964 memset (opoutput, 0, sizeof opoutput);
2966 putc (c, asm_out_file);
2967 #ifdef ASM_OUTPUT_OPCODE
2968 while ((c = *p) == '\t')
2970 putc (c, asm_out_file);
2973 ASM_OUTPUT_OPCODE (asm_out_file, p);
2977 #ifdef ASSEMBLER_DIALECT
2983 output_operand_lossage ("nested assembly dialect alternatives");
2987 /* If we want the first dialect, do nothing. Otherwise, skip
2988 DIALECT_NUMBER of strings ending with '|'. */
2989 for (i = 0; i < dialect_number; i++)
2991 while (*p && *p != '}' && *p++ != '|')
3000 output_operand_lossage ("unterminated assembly dialect alternative");
3007 /* Skip to close brace. */
3012 output_operand_lossage ("unterminated assembly dialect alternative");
3016 while (*p++ != '}');
3020 putc (c, asm_out_file);
3025 putc (c, asm_out_file);
3031 /* %% outputs a single %. */
3035 putc (c, asm_out_file);
3037 /* %= outputs a number which is unique to each insn in the entire
3038 compilation. This is useful for making local labels that are
3039 referred to more than once in a given insn. */
3043 fprintf (asm_out_file, "%d", insn_counter);
3045 /* % followed by a letter and some digits
3046 outputs an operand in a special way depending on the letter.
3047 Letters `acln' are implemented directly.
3048 Other letters are passed to `output_operand' so that
3049 the PRINT_OPERAND macro can define them. */
3050 else if (ISALPHA (*p))
3053 unsigned long opnum;
3056 opnum = strtoul (p, &endptr, 10);
3059 output_operand_lossage ("operand number missing "
3061 else if (this_is_asm_operands && opnum >= insn_noperands)
3062 output_operand_lossage ("operand number out of range");
3063 else if (letter == 'l')
3064 output_asm_label (operands[opnum]);
3065 else if (letter == 'a')
3066 output_address (operands[opnum]);
3067 else if (letter == 'c')
3069 if (CONSTANT_ADDRESS_P (operands[opnum]))
3070 output_addr_const (asm_out_file, operands[opnum]);
3072 output_operand (operands[opnum], 'c');
3074 else if (letter == 'n')
3076 if (GET_CODE (operands[opnum]) == CONST_INT)
3077 fprintf (asm_out_file, HOST_WIDE_INT_PRINT_DEC,
3078 - INTVAL (operands[opnum]));
3081 putc ('-', asm_out_file);
3082 output_addr_const (asm_out_file, operands[opnum]);
3086 output_operand (operands[opnum], letter);
3088 if (!opoutput[opnum])
3089 oporder[ops++] = opnum;
3090 opoutput[opnum] = 1;
3095 /* % followed by a digit outputs an operand the default way. */
3096 else if (ISDIGIT (*p))
3098 unsigned long opnum;
3101 opnum = strtoul (p, &endptr, 10);
3102 if (this_is_asm_operands && opnum >= insn_noperands)
3103 output_operand_lossage ("operand number out of range");
3105 output_operand (operands[opnum], 0);
3107 if (!opoutput[opnum])
3108 oporder[ops++] = opnum;
3109 opoutput[opnum] = 1;
3114 /* % followed by punctuation: output something for that
3115 punctuation character alone, with no operand.
3116 The PRINT_OPERAND macro decides what is actually done. */
3117 #ifdef PRINT_OPERAND_PUNCT_VALID_P
3118 else if (PRINT_OPERAND_PUNCT_VALID_P ((unsigned char) *p))
3119 output_operand (NULL_RTX, *p++);
3122 output_operand_lossage ("invalid %%-code");
3126 putc (c, asm_out_file);
3129 /* Write out the variable names for operands, if we know them. */
3130 if (flag_verbose_asm)
3131 output_asm_operand_names (operands, oporder, ops);
3132 if (flag_print_asm_name)
3135 putc ('\n', asm_out_file);
3138 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
3141 output_asm_label (rtx x)
3145 if (GET_CODE (x) == LABEL_REF)
3149 && NOTE_LINE_NUMBER (x) == NOTE_INSN_DELETED_LABEL))
3150 ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x));
3152 output_operand_lossage ("'%%l' operand isn't a label");
3154 assemble_name (asm_out_file, buf);
3157 /* Print operand X using machine-dependent assembler syntax.
3158 The macro PRINT_OPERAND is defined just to control this function.
3159 CODE is a non-digit that preceded the operand-number in the % spec,
3160 such as 'z' if the spec was `%z3'. CODE is 0 if there was no char
3161 between the % and the digits.
3162 When CODE is a non-letter, X is 0.
3164 The meanings of the letters are machine-dependent and controlled
3165 by PRINT_OPERAND. */
3168 output_operand (rtx x, int code ATTRIBUTE_UNUSED)
3170 if (x && GET_CODE (x) == SUBREG)
3171 x = alter_subreg (&x);
3173 /* X must not be a pseudo reg. */
3174 gcc_assert (!x || !REG_P (x) || REGNO (x) < FIRST_PSEUDO_REGISTER);
3176 PRINT_OPERAND (asm_out_file, x, code);
3179 /* Print a memory reference operand for address X
3180 using machine-dependent assembler syntax.
3181 The macro PRINT_OPERAND_ADDRESS exists just to control this function. */
3184 output_address (rtx x)
3186 walk_alter_subreg (&x);
3187 PRINT_OPERAND_ADDRESS (asm_out_file, x);
3190 /* Print an integer constant expression in assembler syntax.
3191 Addition and subtraction are the only arithmetic
3192 that may appear in these expressions. */
3195 output_addr_const (FILE *file, rtx x)
3200 switch (GET_CODE (x))
3207 if (SYMBOL_REF_DECL (x))
3208 mark_decl_referenced (SYMBOL_REF_DECL (x));
3209 #ifdef ASM_OUTPUT_SYMBOL_REF
3210 ASM_OUTPUT_SYMBOL_REF (file, x);
3212 assemble_name (file, XSTR (x, 0));
3220 ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x));
3221 #ifdef ASM_OUTPUT_LABEL_REF
3222 ASM_OUTPUT_LABEL_REF (file, buf);
3224 assemble_name (file, buf);
3229 fprintf (file, HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
3233 /* This used to output parentheses around the expression,
3234 but that does not work on the 386 (either ATT or BSD assembler). */
3235 output_addr_const (file, XEXP (x, 0));
3239 if (GET_MODE (x) == VOIDmode)
3241 /* We can use %d if the number is one word and positive. */
3242 if (CONST_DOUBLE_HIGH (x))
3243 fprintf (file, HOST_WIDE_INT_PRINT_DOUBLE_HEX,
3244 CONST_DOUBLE_HIGH (x), CONST_DOUBLE_LOW (x));
3245 else if (CONST_DOUBLE_LOW (x) < 0)
3246 fprintf (file, HOST_WIDE_INT_PRINT_HEX, CONST_DOUBLE_LOW (x));
3248 fprintf (file, HOST_WIDE_INT_PRINT_DEC, CONST_DOUBLE_LOW (x));
3251 /* We can't handle floating point constants;
3252 PRINT_OPERAND must handle them. */
3253 output_operand_lossage ("floating constant misused");
3257 /* Some assemblers need integer constants to appear last (eg masm). */
3258 if (GET_CODE (XEXP (x, 0)) == CONST_INT)
3260 output_addr_const (file, XEXP (x, 1));
3261 if (INTVAL (XEXP (x, 0)) >= 0)
3262 fprintf (file, "+");
3263 output_addr_const (file, XEXP (x, 0));
3267 output_addr_const (file, XEXP (x, 0));
3268 if (GET_CODE (XEXP (x, 1)) != CONST_INT
3269 || INTVAL (XEXP (x, 1)) >= 0)
3270 fprintf (file, "+");
3271 output_addr_const (file, XEXP (x, 1));
3276 /* Avoid outputting things like x-x or x+5-x,
3277 since some assemblers can't handle that. */
3278 x = simplify_subtraction (x);
3279 if (GET_CODE (x) != MINUS)
3282 output_addr_const (file, XEXP (x, 0));
3283 fprintf (file, "-");
3284 if ((GET_CODE (XEXP (x, 1)) == CONST_INT && INTVAL (XEXP (x, 1)) >= 0)
3285 || GET_CODE (XEXP (x, 1)) == PC
3286 || GET_CODE (XEXP (x, 1)) == SYMBOL_REF)
3287 output_addr_const (file, XEXP (x, 1));
3290 fputs (targetm.asm_out.open_paren, file);
3291 output_addr_const (file, XEXP (x, 1));
3292 fputs (targetm.asm_out.close_paren, file);
3299 output_addr_const (file, XEXP (x, 0));
3303 #ifdef OUTPUT_ADDR_CONST_EXTRA
3304 OUTPUT_ADDR_CONST_EXTRA (file, x, fail);
3309 output_operand_lossage ("invalid expression as operand");
3313 /* A poor man's fprintf, with the added features of %I, %R, %L, and %U.
3314 %R prints the value of REGISTER_PREFIX.
3315 %L prints the value of LOCAL_LABEL_PREFIX.
3316 %U prints the value of USER_LABEL_PREFIX.
3317 %I prints the value of IMMEDIATE_PREFIX.
3318 %O runs ASM_OUTPUT_OPCODE to transform what follows in the string.
3319 Also supported are %d, %i, %u, %x, %X, %o, %c, %s and %%.
3321 We handle alternate assembler dialects here, just like output_asm_insn. */
3324 asm_fprintf (FILE *file, const char *p, ...)
3330 va_start (argptr, p);
3337 #ifdef ASSEMBLER_DIALECT
3342 /* If we want the first dialect, do nothing. Otherwise, skip
3343 DIALECT_NUMBER of strings ending with '|'. */
3344 for (i = 0; i < dialect_number; i++)
3346 while (*p && *p++ != '|')
3356 /* Skip to close brace. */
3357 while (*p && *p++ != '}')
3368 while (strchr ("-+ #0", c))
3373 while (ISDIGIT (c) || c == '.')
3384 case 'd': case 'i': case 'u':
3385 case 'x': case 'X': case 'o':
3389 fprintf (file, buf, va_arg (argptr, int));
3393 /* This is a prefix to the 'd', 'i', 'u', 'x', 'X', and
3394 'o' cases, but we do not check for those cases. It
3395 means that the value is a HOST_WIDE_INT, which may be
3396 either `long' or `long long'. */
3397 memcpy (q, HOST_WIDE_INT_PRINT, strlen (HOST_WIDE_INT_PRINT));
3398 q += strlen (HOST_WIDE_INT_PRINT);
3401 fprintf (file, buf, va_arg (argptr, HOST_WIDE_INT));
3406 #ifdef HAVE_LONG_LONG
3412 fprintf (file, buf, va_arg (argptr, long long));
3419 fprintf (file, buf, va_arg (argptr, long));
3427 fprintf (file, buf, va_arg (argptr, char *));
3431 #ifdef ASM_OUTPUT_OPCODE
3432 ASM_OUTPUT_OPCODE (asm_out_file, p);
3437 #ifdef REGISTER_PREFIX
3438 fprintf (file, "%s", REGISTER_PREFIX);
3443 #ifdef IMMEDIATE_PREFIX
3444 fprintf (file, "%s", IMMEDIATE_PREFIX);
3449 #ifdef LOCAL_LABEL_PREFIX
3450 fprintf (file, "%s", LOCAL_LABEL_PREFIX);
3455 fputs (user_label_prefix, file);
3458 #ifdef ASM_FPRINTF_EXTENSIONS
3459 /* Uppercase letters are reserved for general use by asm_fprintf
3460 and so are not available to target specific code. In order to
3461 prevent the ASM_FPRINTF_EXTENSIONS macro from using them then,
3462 they are defined here. As they get turned into real extensions
3463 to asm_fprintf they should be removed from this list. */
3464 case 'A': case 'B': case 'C': case 'D': case 'E':
3465 case 'F': case 'G': case 'H': case 'J': case 'K':
3466 case 'M': case 'N': case 'P': case 'Q': case 'S':
3467 case 'T': case 'V': case 'W': case 'Y': case 'Z':
3470 ASM_FPRINTF_EXTENSIONS (file, argptr, p)
3483 /* Split up a CONST_DOUBLE or integer constant rtx
3484 into two rtx's for single words,
3485 storing in *FIRST the word that comes first in memory in the target
3486 and in *SECOND the other. */
3489 split_double (rtx value, rtx *first, rtx *second)
3491 if (GET_CODE (value) == CONST_INT)
3493 if (HOST_BITS_PER_WIDE_INT >= (2 * BITS_PER_WORD))
3495 /* In this case the CONST_INT holds both target words.
3496 Extract the bits from it into two word-sized pieces.
3497 Sign extend each half to HOST_WIDE_INT. */
3498 unsigned HOST_WIDE_INT low, high;
3499 unsigned HOST_WIDE_INT mask, sign_bit, sign_extend;
3501 /* Set sign_bit to the most significant bit of a word. */
3503 sign_bit <<= BITS_PER_WORD - 1;
3505 /* Set mask so that all bits of the word are set. We could
3506 have used 1 << BITS_PER_WORD instead of basing the
3507 calculation on sign_bit. However, on machines where
3508 HOST_BITS_PER_WIDE_INT == BITS_PER_WORD, it could cause a
3509 compiler warning, even though the code would never be
3511 mask = sign_bit << 1;
3514 /* Set sign_extend as any remaining bits. */
3515 sign_extend = ~mask;
3517 /* Pick the lower word and sign-extend it. */
3518 low = INTVAL (value);
3523 /* Pick the higher word, shifted to the least significant
3524 bits, and sign-extend it. */
3525 high = INTVAL (value);
3526 high >>= BITS_PER_WORD - 1;
3529 if (high & sign_bit)
3530 high |= sign_extend;
3532 /* Store the words in the target machine order. */
3533 if (WORDS_BIG_ENDIAN)
3535 *first = GEN_INT (high);
3536 *second = GEN_INT (low);
3540 *first = GEN_INT (low);
3541 *second = GEN_INT (high);
3546 /* The rule for using CONST_INT for a wider mode
3547 is that we regard the value as signed.
3548 So sign-extend it. */
3549 rtx high = (INTVAL (value) < 0 ? constm1_rtx : const0_rtx);
3550 if (WORDS_BIG_ENDIAN)
3562 else if (GET_CODE (value) != CONST_DOUBLE)
3564 if (WORDS_BIG_ENDIAN)
3566 *first = const0_rtx;
3572 *second = const0_rtx;
3575 else if (GET_MODE (value) == VOIDmode
3576 /* This is the old way we did CONST_DOUBLE integers. */
3577 || GET_MODE_CLASS (GET_MODE (value)) == MODE_INT)
3579 /* In an integer, the words are defined as most and least significant.
3580 So order them by the target's convention. */
3581 if (WORDS_BIG_ENDIAN)
3583 *first = GEN_INT (CONST_DOUBLE_HIGH (value));
3584 *second = GEN_INT (CONST_DOUBLE_LOW (value));
3588 *first = GEN_INT (CONST_DOUBLE_LOW (value));
3589 *second = GEN_INT (CONST_DOUBLE_HIGH (value));
3596 REAL_VALUE_FROM_CONST_DOUBLE (r, value);
3598 /* Note, this converts the REAL_VALUE_TYPE to the target's
3599 format, splits up the floating point double and outputs
3600 exactly 32 bits of it into each of l[0] and l[1] --
3601 not necessarily BITS_PER_WORD bits. */
3602 REAL_VALUE_TO_TARGET_DOUBLE (r, l);
3604 /* If 32 bits is an entire word for the target, but not for the host,
3605 then sign-extend on the host so that the number will look the same
3606 way on the host that it would on the target. See for instance
3607 simplify_unary_operation. The #if is needed to avoid compiler
3610 #if HOST_BITS_PER_LONG > 32
3611 if (BITS_PER_WORD < HOST_BITS_PER_LONG && BITS_PER_WORD == 32)
3613 if (l[0] & ((long) 1 << 31))
3614 l[0] |= ((long) (-1) << 32);
3615 if (l[1] & ((long) 1 << 31))
3616 l[1] |= ((long) (-1) << 32);
3620 *first = GEN_INT (l[0]);
3621 *second = GEN_INT (l[1]);
3625 /* Return nonzero if this function has no function calls. */
3628 leaf_function_p (void)
3633 if (current_function_profile || profile_arc_flag)
3636 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3639 && ! SIBLING_CALL_P (insn))
3641 if (NONJUMP_INSN_P (insn)
3642 && GET_CODE (PATTERN (insn)) == SEQUENCE
3643 && CALL_P (XVECEXP (PATTERN (insn), 0, 0))
3644 && ! SIBLING_CALL_P (XVECEXP (PATTERN (insn), 0, 0)))
3647 for (link = current_function_epilogue_delay_list;
3649 link = XEXP (link, 1))
3651 insn = XEXP (link, 0);
3654 && ! SIBLING_CALL_P (insn))
3656 if (NONJUMP_INSN_P (insn)
3657 && GET_CODE (PATTERN (insn)) == SEQUENCE
3658 && CALL_P (XVECEXP (PATTERN (insn), 0, 0))
3659 && ! SIBLING_CALL_P (XVECEXP (PATTERN (insn), 0, 0)))
3666 /* Return 1 if branch is a forward branch.
3667 Uses insn_shuid array, so it works only in the final pass. May be used by
3668 output templates to customary add branch prediction hints.
3671 final_forward_branch_p (rtx insn)
3673 int insn_id, label_id;
3675 gcc_assert (uid_shuid);
3676 insn_id = INSN_SHUID (insn);
3677 label_id = INSN_SHUID (JUMP_LABEL (insn));
3678 /* We've hit some insns that does not have id information available. */
3679 gcc_assert (insn_id && label_id);
3680 return insn_id < label_id;
3683 /* On some machines, a function with no call insns
3684 can run faster if it doesn't create its own register window.
3685 When output, the leaf function should use only the "output"
3686 registers. Ordinarily, the function would be compiled to use
3687 the "input" registers to find its arguments; it is a candidate
3688 for leaf treatment if it uses only the "input" registers.
3689 Leaf function treatment means renumbering so the function
3690 uses the "output" registers instead. */
3692 #ifdef LEAF_REGISTERS
3694 /* Return 1 if this function uses only the registers that can be
3695 safely renumbered. */
3698 only_leaf_regs_used (void)
3701 const char *const permitted_reg_in_leaf_functions = LEAF_REGISTERS;
3703 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
3704 if ((regs_ever_live[i] || global_regs[i])
3705 && ! permitted_reg_in_leaf_functions[i])
3708 if (current_function_uses_pic_offset_table
3709 && pic_offset_table_rtx != 0
3710 && REG_P (pic_offset_table_rtx)
3711 && ! permitted_reg_in_leaf_functions[REGNO (pic_offset_table_rtx)])
3717 /* Scan all instructions and renumber all registers into those
3718 available in leaf functions. */
3721 leaf_renumber_regs (rtx first)
3725 /* Renumber only the actual patterns.
3726 The reg-notes can contain frame pointer refs,
3727 and renumbering them could crash, and should not be needed. */
3728 for (insn = first; insn; insn = NEXT_INSN (insn))
3730 leaf_renumber_regs_insn (PATTERN (insn));
3731 for (insn = current_function_epilogue_delay_list;
3733 insn = XEXP (insn, 1))
3734 if (INSN_P (XEXP (insn, 0)))
3735 leaf_renumber_regs_insn (PATTERN (XEXP (insn, 0)));
3738 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
3739 available in leaf functions. */
3742 leaf_renumber_regs_insn (rtx in_rtx)
3745 const char *format_ptr;
3750 /* Renumber all input-registers into output-registers.
3751 renumbered_regs would be 1 for an output-register;
3758 /* Don't renumber the same reg twice. */
3762 newreg = REGNO (in_rtx);
3763 /* Don't try to renumber pseudo regs. It is possible for a pseudo reg
3764 to reach here as part of a REG_NOTE. */
3765 if (newreg >= FIRST_PSEUDO_REGISTER)
3770 newreg = LEAF_REG_REMAP (newreg);
3771 gcc_assert (newreg >= 0);
3772 regs_ever_live[REGNO (in_rtx)] = 0;
3773 regs_ever_live[newreg] = 1;
3774 REGNO (in_rtx) = newreg;
3778 if (INSN_P (in_rtx))
3780 /* Inside a SEQUENCE, we find insns.
3781 Renumber just the patterns of these insns,
3782 just as we do for the top-level insns. */
3783 leaf_renumber_regs_insn (PATTERN (in_rtx));
3787 format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx));
3789 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
3790 switch (*format_ptr++)
3793 leaf_renumber_regs_insn (XEXP (in_rtx, i));
3797 if (NULL != XVEC (in_rtx, i))
3799 for (j = 0; j < XVECLEN (in_rtx, i); j++)
3800 leaf_renumber_regs_insn (XVECEXP (in_rtx, i, j));
3820 /* When -gused is used, emit debug info for only used symbols. But in
3821 addition to the standard intercepted debug_hooks there are some direct
3822 calls into this file, i.e., dbxout_symbol, dbxout_parms, and dbxout_reg_params.
3823 Those routines may also be called from a higher level intercepted routine. So
3824 to prevent recording data for an inner call to one of these for an intercept,
3825 we maintain an intercept nesting counter (debug_nesting). We only save the
3826 intercepted arguments if the nesting is 1. */
3827 int debug_nesting = 0;
3829 static tree *symbol_queue;
3830 int symbol_queue_index = 0;
3831 static int symbol_queue_size = 0;
3833 /* Generate the symbols for any queued up type symbols we encountered
3834 while generating the type info for some originally used symbol.
3835 This might generate additional entries in the queue. Only when
3836 the nesting depth goes to 0 is this routine called. */
3839 debug_flush_symbol_queue (void)
3843 /* Make sure that additionally queued items are not flushed
3848 for (i = 0; i < symbol_queue_index; ++i)
3850 /* If we pushed queued symbols then such symbols are must be
3851 output no matter what anyone else says. Specifically,
3852 we need to make sure dbxout_symbol() thinks the symbol was
3853 used and also we need to override TYPE_DECL_SUPPRESS_DEBUG
3854 which may be set for outside reasons. */
3855 int saved_tree_used = TREE_USED (symbol_queue[i]);
3856 int saved_suppress_debug = TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]);
3857 TREE_USED (symbol_queue[i]) = 1;
3858 TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]) = 0;
3860 #ifdef DBX_DEBUGGING_INFO
3861 dbxout_symbol (symbol_queue[i], 0);
3864 TREE_USED (symbol_queue[i]) = saved_tree_used;
3865 TYPE_DECL_SUPPRESS_DEBUG (symbol_queue[i]) = saved_suppress_debug;
3868 symbol_queue_index = 0;
3872 /* Queue a type symbol needed as part of the definition of a decl
3873 symbol. These symbols are generated when debug_flush_symbol_queue()
3877 debug_queue_symbol (tree decl)
3879 if (symbol_queue_index >= symbol_queue_size)
3881 symbol_queue_size += 10;
3882 symbol_queue = xrealloc (symbol_queue,
3883 symbol_queue_size * sizeof (tree));
3886 symbol_queue[symbol_queue_index++] = decl;
3889 /* Free symbol queue. */
3891 debug_free_queue (void)
3895 free (symbol_queue);
3896 symbol_queue = NULL;
3897 symbol_queue_size = 0;
3901 /* Turn the RTL into assembly. */
3903 rest_of_handle_final (void)
3908 /* Get the function's name, as described by its RTL. This may be
3909 different from the DECL_NAME name used in the source file. */
3911 x = DECL_RTL (current_function_decl);
3912 gcc_assert (MEM_P (x));
3914 gcc_assert (GET_CODE (x) == SYMBOL_REF);
3915 fnname = XSTR (x, 0);
3917 assemble_start_function (current_function_decl, fnname);
3918 final_start_function (get_insns (), asm_out_file, optimize);
3919 final (get_insns (), asm_out_file, optimize);
3920 final_end_function ();
3922 #ifdef TARGET_UNWIND_INFO
3923 /* ??? The IA-64 ".handlerdata" directive must be issued before
3924 the ".endp" directive that closes the procedure descriptor. */
3925 output_function_exception_table ();
3928 assemble_end_function (current_function_decl, fnname);
3930 #ifndef TARGET_UNWIND_INFO
3931 /* Otherwise, it feels unclean to switch sections in the middle. */
3932 output_function_exception_table ();
3935 user_defined_section_attribute = false;
3938 fflush (asm_out_file);
3940 /* Release all memory allocated by flow. */
3941 free_basic_block_vars ();
3943 /* Write DBX symbols if requested. */
3945 /* Note that for those inline functions where we don't initially
3946 know for certain that we will be generating an out-of-line copy,
3947 the first invocation of this routine (rest_of_compilation) will
3948 skip over this code by doing a `goto exit_rest_of_compilation;'.
3949 Later on, wrapup_global_declarations will (indirectly) call
3950 rest_of_compilation again for those inline functions that need
3951 to have out-of-line copies generated. During that call, we
3952 *will* be routed past here. */
3954 timevar_push (TV_SYMOUT);
3955 (*debug_hooks->function_decl) (current_function_decl);
3956 timevar_pop (TV_SYMOUT);
3960 struct tree_opt_pass pass_final =
3964 rest_of_handle_final, /* execute */
3967 0, /* static_pass_number */
3968 TV_FINAL, /* tv_id */
3969 0, /* properties_required */
3970 0, /* properties_provided */
3971 0, /* properties_destroyed */
3972 0, /* todo_flags_start */
3973 TODO_ggc_collect, /* todo_flags_finish */
3979 rest_of_handle_shorten_branches (void)
3981 /* Shorten branches. */
3982 shorten_branches (get_insns ());
3986 struct tree_opt_pass pass_shorten_branches =
3988 "shorten", /* name */
3990 rest_of_handle_shorten_branches, /* execute */
3993 0, /* static_pass_number */
3994 TV_FINAL, /* tv_id */
3995 0, /* properties_required */
3996 0, /* properties_provided */
3997 0, /* properties_destroyed */
3998 0, /* todo_flags_start */
3999 TODO_dump_func, /* todo_flags_finish */
4005 rest_of_clean_state (void)
4009 /* It is very important to decompose the RTL instruction chain here:
4010 debug information keeps pointing into CODE_LABEL insns inside the function
4011 body. If these remain pointing to the other insns, we end up preserving
4012 whole RTL chain and attached detailed debug info in memory. */
4013 for (insn = get_insns (); insn; insn = next)
4015 next = NEXT_INSN (insn);
4016 NEXT_INSN (insn) = NULL;
4017 PREV_INSN (insn) = NULL;
4020 /* In case the function was not output,
4021 don't leave any temporary anonymous types
4022 queued up for sdb output. */
4023 #ifdef SDB_DEBUGGING_INFO
4024 if (write_symbols == SDB_DEBUG)
4025 sdbout_types (NULL_TREE);
4028 reload_completed = 0;
4029 epilogue_completed = 0;
4030 flow2_completed = 0;
4033 /* Clear out the insn_length contents now that they are no
4035 init_insn_lengths ();
4037 /* Show no temporary slots allocated. */
4040 free_basic_block_vars ();
4041 free_bb_for_insn ();
4044 if (targetm.binds_local_p (current_function_decl))
4046 int pref = cfun->preferred_stack_boundary;
4047 if (cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
4048 pref = cfun->stack_alignment_needed;
4049 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
4053 /* Make sure volatile mem refs aren't considered valid operands for
4054 arithmetic insns. We must call this here if this is a nested inline
4055 function, since the above code leaves us in the init_recog state,
4056 and the function context push/pop code does not save/restore volatile_ok.
4058 ??? Maybe it isn't necessary for expand_start_function to call this
4059 anymore if we do it here? */
4061 init_recog_no_volatile ();
4063 /* We're done with this function. Free up memory if we can. */
4064 free_after_parsing (cfun);
4065 free_after_compilation (cfun);
4069 struct tree_opt_pass pass_clean_state =
4073 rest_of_clean_state, /* execute */
4076 0, /* static_pass_number */
4077 TV_FINAL, /* tv_id */
4078 0, /* properties_required */
4079 0, /* properties_provided */
4080 PROP_rtl, /* properties_destroyed */
4081 0, /* todo_flags_start */
4082 0, /* todo_flags_finish */