1 /* Convert RTL to assembler code and output it, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
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"
81 #ifdef XCOFF_DEBUGGING_INFO
82 #include "xcoffout.h" /* Needed for external data
83 declarations for e.g. AIX 4.x. */
86 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
87 #include "dwarf2out.h"
90 #ifdef DBX_DEBUGGING_INFO
94 #ifdef SDB_DEBUGGING_INFO
98 /* If we aren't using cc0, CC_STATUS_INIT shouldn't exist. So define a
99 null default for it to save conditionalization later. */
100 #ifndef CC_STATUS_INIT
101 #define CC_STATUS_INIT
104 /* How to start an assembler comment. */
105 #ifndef ASM_COMMENT_START
106 #define ASM_COMMENT_START ";#"
109 /* Is the given character a logical line separator for the assembler? */
110 #ifndef IS_ASM_LOGICAL_LINE_SEPARATOR
111 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C) ((C) == ';')
114 #ifndef JUMP_TABLES_IN_TEXT_SECTION
115 #define JUMP_TABLES_IN_TEXT_SECTION 0
118 /* Bitflags used by final_scan_insn. */
121 #define SEEN_EMITTED 4
123 /* Last insn processed by final_scan_insn. */
124 static rtx debug_insn
;
125 rtx current_output_insn
;
127 /* Line number of last NOTE. */
128 static int last_linenum
;
130 /* Highest line number in current block. */
131 static int high_block_linenum
;
133 /* Likewise for function. */
134 static int high_function_linenum
;
136 /* Filename of last NOTE. */
137 static const char *last_filename
;
139 /* Whether to force emission of a line note before the next insn. */
140 static bool force_source_line
= false;
142 extern const int length_unit_log
; /* This is defined in insn-attrtab.c. */
144 /* Nonzero while outputting an `asm' with operands.
145 This means that inconsistencies are the user's fault, so don't die.
146 The precise value is the insn being output, to pass to error_for_asm. */
147 rtx this_is_asm_operands
;
149 /* Number of operands of this insn, for an `asm' with operands. */
150 static unsigned int insn_noperands
;
152 /* Compare optimization flag. */
154 static rtx last_ignored_compare
= 0;
156 /* Assign a unique number to each insn that is output.
157 This can be used to generate unique local labels. */
159 static int insn_counter
= 0;
162 /* This variable contains machine-dependent flags (defined in tm.h)
163 set and examined by output routines
164 that describe how to interpret the condition codes properly. */
168 /* During output of an insn, this contains a copy of cc_status
169 from before the insn. */
171 CC_STATUS cc_prev_status
;
174 /* Indexed by hardware reg number, is 1 if that register is ever
175 used in the current function.
177 In life_analysis, or in stupid_life_analysis, this is set
178 up to record the hard regs used explicitly. Reload adds
179 in the hard regs used for holding pseudo regs. Final uses
180 it to generate the code in the function prologue and epilogue
181 to save and restore registers as needed. */
183 char regs_ever_live
[FIRST_PSEUDO_REGISTER
];
185 /* Like regs_ever_live, but 1 if a reg is set or clobbered from an asm.
186 Unlike regs_ever_live, elements of this array corresponding to
187 eliminable regs like the frame pointer are set if an asm sets them. */
189 char regs_asm_clobbered
[FIRST_PSEUDO_REGISTER
];
191 /* Nonzero means current function must be given a frame pointer.
192 Initialized in function.c to 0. Set only in reload1.c as per
193 the needs of the function. */
195 int frame_pointer_needed
;
197 /* Number of unmatched NOTE_INSN_BLOCK_BEG notes we have seen. */
199 static int block_depth
;
201 /* Nonzero if have enabled APP processing of our assembler output. */
205 /* If we are outputting an insn sequence, this contains the sequence rtx.
210 #ifdef ASSEMBLER_DIALECT
212 /* Number of the assembler dialect to use, starting at 0. */
213 static int dialect_number
;
216 #ifdef HAVE_conditional_execution
217 /* Nonnull if the insn currently being emitted was a COND_EXEC pattern. */
218 rtx current_insn_predicate
;
221 #ifdef HAVE_ATTR_length
222 static int asm_insn_count (rtx
);
224 static void profile_function (FILE *);
225 static void profile_after_prologue (FILE *);
226 static bool notice_source_line (rtx
);
227 static rtx
walk_alter_subreg (rtx
*);
228 static void output_asm_name (void);
229 static void output_alternate_entry_point (FILE *, rtx
);
230 static tree
get_mem_expr_from_op (rtx
, int *);
231 static void output_asm_operand_names (rtx
*, int *, int);
232 static void output_operand (rtx
, int);
233 #ifdef LEAF_REGISTERS
234 static void leaf_renumber_regs (rtx
);
237 static int alter_cond (rtx
);
239 #ifndef ADDR_VEC_ALIGN
240 static int final_addr_vec_align (rtx
);
242 #ifdef HAVE_ATTR_length
243 static int align_fuzz (rtx
, rtx
, int, unsigned);
246 /* Initialize data in final at the beginning of a compilation. */
249 init_final (const char *filename ATTRIBUTE_UNUSED
)
254 #ifdef ASSEMBLER_DIALECT
255 dialect_number
= ASSEMBLER_DIALECT
;
259 /* Default target function prologue and epilogue assembler output.
261 If not overridden for epilogue code, then the function body itself
262 contains return instructions wherever needed. */
264 default_function_pro_epilogue (FILE *file ATTRIBUTE_UNUSED
,
265 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
269 /* Default target hook that outputs nothing to a stream. */
271 no_asm_to_stream (FILE *file ATTRIBUTE_UNUSED
)
275 /* Enable APP processing of subsequent output.
276 Used before the output from an `asm' statement. */
283 fputs (ASM_APP_ON
, asm_out_file
);
288 /* Disable APP processing of subsequent output.
289 Called from varasm.c before most kinds of output. */
296 fputs (ASM_APP_OFF
, asm_out_file
);
301 /* Return the number of slots filled in the current
302 delayed branch sequence (we don't count the insn needing the
303 delay slot). Zero if not in a delayed branch sequence. */
307 dbr_sequence_length (void)
309 if (final_sequence
!= 0)
310 return XVECLEN (final_sequence
, 0) - 1;
316 /* The next two pages contain routines used to compute the length of an insn
317 and to shorten branches. */
319 /* Arrays for insn lengths, and addresses. The latter is referenced by
320 `insn_current_length'. */
322 static int *insn_lengths
;
324 VEC(int,heap
) *insn_addresses_
;
326 /* Max uid for which the above arrays are valid. */
327 static int insn_lengths_max_uid
;
329 /* Address of insn being processed. Used by `insn_current_length'. */
330 int insn_current_address
;
332 /* Address of insn being processed in previous iteration. */
333 int insn_last_address
;
335 /* known invariant alignment of insn being processed. */
336 int insn_current_align
;
338 /* After shorten_branches, for any insn, uid_align[INSN_UID (insn)]
339 gives the next following alignment insn that increases the known
340 alignment, or NULL_RTX if there is no such insn.
341 For any alignment obtained this way, we can again index uid_align with
342 its uid to obtain the next following align that in turn increases the
343 alignment, till we reach NULL_RTX; the sequence obtained this way
344 for each insn we'll call the alignment chain of this insn in the following
347 struct label_alignment
353 static rtx
*uid_align
;
354 static int *uid_shuid
;
355 static struct label_alignment
*label_align
;
357 /* Indicate that branch shortening hasn't yet been done. */
360 init_insn_lengths (void)
371 insn_lengths_max_uid
= 0;
373 #ifdef HAVE_ATTR_length
374 INSN_ADDRESSES_FREE ();
383 /* Obtain the current length of an insn. If branch shortening has been done,
384 get its actual length. Otherwise, use FALLBACK_FN to calculate the
387 get_attr_length_1 (rtx insn ATTRIBUTE_UNUSED
,
388 int (*fallback_fn
) (rtx
) ATTRIBUTE_UNUSED
)
390 #ifdef HAVE_ATTR_length
395 if (insn_lengths_max_uid
> INSN_UID (insn
))
396 return insn_lengths
[INSN_UID (insn
)];
398 switch (GET_CODE (insn
))
406 length
= fallback_fn (insn
);
410 body
= PATTERN (insn
);
411 if (GET_CODE (body
) == ADDR_VEC
|| GET_CODE (body
) == ADDR_DIFF_VEC
)
413 /* Alignment is machine-dependent and should be handled by
417 length
= fallback_fn (insn
);
421 body
= PATTERN (insn
);
422 if (GET_CODE (body
) == USE
|| GET_CODE (body
) == CLOBBER
)
425 else if (GET_CODE (body
) == ASM_INPUT
|| asm_noperands (body
) >= 0)
426 length
= asm_insn_count (body
) * fallback_fn (insn
);
427 else if (GET_CODE (body
) == SEQUENCE
)
428 for (i
= 0; i
< XVECLEN (body
, 0); i
++)
429 length
+= get_attr_length (XVECEXP (body
, 0, i
));
431 length
= fallback_fn (insn
);
438 #ifdef ADJUST_INSN_LENGTH
439 ADJUST_INSN_LENGTH (insn
, length
);
442 #else /* not HAVE_ATTR_length */
444 #define insn_default_length 0
445 #define insn_min_length 0
446 #endif /* not HAVE_ATTR_length */
449 /* Obtain the current length of an insn. If branch shortening has been done,
450 get its actual length. Otherwise, get its maximum length. */
452 get_attr_length (rtx insn
)
454 return get_attr_length_1 (insn
, insn_default_length
);
457 /* Obtain the current length of an insn. If branch shortening has been done,
458 get its actual length. Otherwise, get its minimum length. */
460 get_attr_min_length (rtx insn
)
462 return get_attr_length_1 (insn
, insn_min_length
);
465 /* Code to handle alignment inside shorten_branches. */
467 /* Here is an explanation how the algorithm in align_fuzz can give
470 Call a sequence of instructions beginning with alignment point X
471 and continuing until the next alignment point `block X'. When `X'
472 is used in an expression, it means the alignment value of the
475 Call the distance between the start of the first insn of block X, and
476 the end of the last insn of block X `IX', for the `inner size of X'.
477 This is clearly the sum of the instruction lengths.
479 Likewise with the next alignment-delimited block following X, which we
482 Call the distance between the start of the first insn of block X, and
483 the start of the first insn of block Y `OX', for the `outer size of X'.
485 The estimated padding is then OX - IX.
487 OX can be safely estimated as
492 OX = round_up(IX, X) + Y - X
494 Clearly est(IX) >= real(IX), because that only depends on the
495 instruction lengths, and those being overestimated is a given.
497 Clearly round_up(foo, Z) >= round_up(bar, Z) if foo >= bar, so
498 we needn't worry about that when thinking about OX.
500 When X >= Y, the alignment provided by Y adds no uncertainty factor
501 for branch ranges starting before X, so we can just round what we have.
502 But when X < Y, we don't know anything about the, so to speak,
503 `middle bits', so we have to assume the worst when aligning up from an
504 address mod X to one mod Y, which is Y - X. */
507 #define LABEL_ALIGN(LABEL) align_labels_log
510 #ifndef LABEL_ALIGN_MAX_SKIP
511 #define LABEL_ALIGN_MAX_SKIP align_labels_max_skip
515 #define LOOP_ALIGN(LABEL) align_loops_log
518 #ifndef LOOP_ALIGN_MAX_SKIP
519 #define LOOP_ALIGN_MAX_SKIP align_loops_max_skip
522 #ifndef LABEL_ALIGN_AFTER_BARRIER
523 #define LABEL_ALIGN_AFTER_BARRIER(LABEL) 0
526 #ifndef LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP
527 #define LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP 0
531 #define JUMP_ALIGN(LABEL) align_jumps_log
534 #ifndef JUMP_ALIGN_MAX_SKIP
535 #define JUMP_ALIGN_MAX_SKIP align_jumps_max_skip
538 #ifndef ADDR_VEC_ALIGN
540 final_addr_vec_align (rtx addr_vec
)
542 int align
= GET_MODE_SIZE (GET_MODE (PATTERN (addr_vec
)));
544 if (align
> BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
545 align
= BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
;
546 return exact_log2 (align
);
550 #define ADDR_VEC_ALIGN(ADDR_VEC) final_addr_vec_align (ADDR_VEC)
553 #ifndef INSN_LENGTH_ALIGNMENT
554 #define INSN_LENGTH_ALIGNMENT(INSN) length_unit_log
557 #define INSN_SHUID(INSN) (uid_shuid[INSN_UID (INSN)])
559 static int min_labelno
, max_labelno
;
561 #define LABEL_TO_ALIGNMENT(LABEL) \
562 (label_align[CODE_LABEL_NUMBER (LABEL) - min_labelno].alignment)
564 #define LABEL_TO_MAX_SKIP(LABEL) \
565 (label_align[CODE_LABEL_NUMBER (LABEL) - min_labelno].max_skip)
567 /* For the benefit of port specific code do this also as a function. */
570 label_to_alignment (rtx label
)
572 return LABEL_TO_ALIGNMENT (label
);
575 #ifdef HAVE_ATTR_length
576 /* The differences in addresses
577 between a branch and its target might grow or shrink depending on
578 the alignment the start insn of the range (the branch for a forward
579 branch or the label for a backward branch) starts out on; if these
580 differences are used naively, they can even oscillate infinitely.
581 We therefore want to compute a 'worst case' address difference that
582 is independent of the alignment the start insn of the range end
583 up on, and that is at least as large as the actual difference.
584 The function align_fuzz calculates the amount we have to add to the
585 naively computed difference, by traversing the part of the alignment
586 chain of the start insn of the range that is in front of the end insn
587 of the range, and considering for each alignment the maximum amount
588 that it might contribute to a size increase.
590 For casesi tables, we also want to know worst case minimum amounts of
591 address difference, in case a machine description wants to introduce
592 some common offset that is added to all offsets in a table.
593 For this purpose, align_fuzz with a growth argument of 0 computes the
594 appropriate adjustment. */
596 /* Compute the maximum delta by which the difference of the addresses of
597 START and END might grow / shrink due to a different address for start
598 which changes the size of alignment insns between START and END.
599 KNOWN_ALIGN_LOG is the alignment known for START.
600 GROWTH should be ~0 if the objective is to compute potential code size
601 increase, and 0 if the objective is to compute potential shrink.
602 The return value is undefined for any other value of GROWTH. */
605 align_fuzz (rtx start
, rtx end
, int known_align_log
, unsigned int growth
)
607 int uid
= INSN_UID (start
);
609 int known_align
= 1 << known_align_log
;
610 int end_shuid
= INSN_SHUID (end
);
613 for (align_label
= uid_align
[uid
]; align_label
; align_label
= uid_align
[uid
])
615 int align_addr
, new_align
;
617 uid
= INSN_UID (align_label
);
618 align_addr
= INSN_ADDRESSES (uid
) - insn_lengths
[uid
];
619 if (uid_shuid
[uid
] > end_shuid
)
621 known_align_log
= LABEL_TO_ALIGNMENT (align_label
);
622 new_align
= 1 << known_align_log
;
623 if (new_align
< known_align
)
625 fuzz
+= (-align_addr
^ growth
) & (new_align
- known_align
);
626 known_align
= new_align
;
631 /* Compute a worst-case reference address of a branch so that it
632 can be safely used in the presence of aligned labels. Since the
633 size of the branch itself is unknown, the size of the branch is
634 not included in the range. I.e. for a forward branch, the reference
635 address is the end address of the branch as known from the previous
636 branch shortening pass, minus a value to account for possible size
637 increase due to alignment. For a backward branch, it is the start
638 address of the branch as known from the current pass, plus a value
639 to account for possible size increase due to alignment.
640 NB.: Therefore, the maximum offset allowed for backward branches needs
641 to exclude the branch size. */
644 insn_current_reference_address (rtx branch
)
649 if (! INSN_ADDRESSES_SET_P ())
652 seq
= NEXT_INSN (PREV_INSN (branch
));
653 seq_uid
= INSN_UID (seq
);
654 if (!JUMP_P (branch
))
655 /* This can happen for example on the PA; the objective is to know the
656 offset to address something in front of the start of the function.
657 Thus, we can treat it like a backward branch.
658 We assume here that FUNCTION_BOUNDARY / BITS_PER_UNIT is larger than
659 any alignment we'd encounter, so we skip the call to align_fuzz. */
660 return insn_current_address
;
661 dest
= JUMP_LABEL (branch
);
663 /* BRANCH has no proper alignment chain set, so use SEQ.
664 BRANCH also has no INSN_SHUID. */
665 if (INSN_SHUID (seq
) < INSN_SHUID (dest
))
667 /* Forward branch. */
668 return (insn_last_address
+ insn_lengths
[seq_uid
]
669 - align_fuzz (seq
, dest
, length_unit_log
, ~0));
673 /* Backward branch. */
674 return (insn_current_address
675 + align_fuzz (dest
, seq
, length_unit_log
, ~0));
678 #endif /* HAVE_ATTR_length */
680 /* Compute branch alignments based on frequency information in the
684 compute_alignments (void)
686 int log
, max_skip
, max_log
;
695 max_labelno
= max_label_num ();
696 min_labelno
= get_first_label_num ();
697 label_align
= XCNEWVEC (struct label_alignment
, max_labelno
- min_labelno
+ 1);
699 /* If not optimizing or optimizing for size, don't assign any alignments. */
700 if (! optimize
|| optimize_size
)
705 rtx label
= BB_HEAD (bb
);
706 int fallthru_frequency
= 0, branch_frequency
= 0, has_fallthru
= 0;
711 || probably_never_executed_bb_p (bb
))
713 max_log
= LABEL_ALIGN (label
);
714 max_skip
= LABEL_ALIGN_MAX_SKIP
;
716 FOR_EACH_EDGE (e
, ei
, bb
->preds
)
718 if (e
->flags
& EDGE_FALLTHRU
)
719 has_fallthru
= 1, fallthru_frequency
+= EDGE_FREQUENCY (e
);
721 branch_frequency
+= EDGE_FREQUENCY (e
);
724 /* There are two purposes to align block with no fallthru incoming edge:
725 1) to avoid fetch stalls when branch destination is near cache boundary
726 2) to improve cache efficiency in case the previous block is not executed
727 (so it does not need to be in the cache).
729 We to catch first case, we align frequently executed blocks.
730 To catch the second, we align blocks that are executed more frequently
731 than the predecessor and the predecessor is likely to not be executed
732 when function is called. */
735 && (branch_frequency
> BB_FREQ_MAX
/ 10
736 || (bb
->frequency
> bb
->prev_bb
->frequency
* 10
737 && (bb
->prev_bb
->frequency
738 <= ENTRY_BLOCK_PTR
->frequency
/ 2))))
740 log
= JUMP_ALIGN (label
);
744 max_skip
= JUMP_ALIGN_MAX_SKIP
;
747 /* In case block is frequent and reached mostly by non-fallthru edge,
748 align it. It is most likely a first block of loop. */
750 && maybe_hot_bb_p (bb
)
751 && branch_frequency
+ fallthru_frequency
> BB_FREQ_MAX
/ 10
752 && branch_frequency
> fallthru_frequency
* 2)
754 log
= LOOP_ALIGN (label
);
758 max_skip
= LOOP_ALIGN_MAX_SKIP
;
761 LABEL_TO_ALIGNMENT (label
) = max_log
;
762 LABEL_TO_MAX_SKIP (label
) = max_skip
;
767 struct tree_opt_pass pass_compute_alignments
=
771 compute_alignments
, /* execute */
774 0, /* static_pass_number */
776 0, /* properties_required */
777 0, /* properties_provided */
778 0, /* properties_destroyed */
779 0, /* todo_flags_start */
780 0, /* todo_flags_finish */
785 /* Make a pass over all insns and compute their actual lengths by shortening
786 any branches of variable length if possible. */
788 /* shorten_branches might be called multiple times: for example, the SH
789 port splits out-of-range conditional branches in MACHINE_DEPENDENT_REORG.
790 In order to do this, it needs proper length information, which it obtains
791 by calling shorten_branches. This cannot be collapsed with
792 shorten_branches itself into a single pass unless we also want to integrate
793 reorg.c, since the branch splitting exposes new instructions with delay
797 shorten_branches (rtx first ATTRIBUTE_UNUSED
)
804 #ifdef HAVE_ATTR_length
805 #define MAX_CODE_ALIGN 16
807 int something_changed
= 1;
808 char *varying_length
;
811 rtx align_tab
[MAX_CODE_ALIGN
];
815 /* Compute maximum UID and allocate label_align / uid_shuid. */
816 max_uid
= get_max_uid ();
818 /* Free uid_shuid before reallocating it. */
821 uid_shuid
= XNEWVEC (int, max_uid
);
823 if (max_labelno
!= max_label_num ())
825 int old
= max_labelno
;
829 max_labelno
= max_label_num ();
831 n_labels
= max_labelno
- min_labelno
+ 1;
832 n_old_labels
= old
- min_labelno
+ 1;
834 label_align
= xrealloc (label_align
,
835 n_labels
* sizeof (struct label_alignment
));
837 /* Range of labels grows monotonically in the function. Failing here
838 means that the initialization of array got lost. */
839 gcc_assert (n_old_labels
<= n_labels
);
841 memset (label_align
+ n_old_labels
, 0,
842 (n_labels
- n_old_labels
) * sizeof (struct label_alignment
));
845 /* Initialize label_align and set up uid_shuid to be strictly
846 monotonically rising with insn order. */
847 /* We use max_log here to keep track of the maximum alignment we want to
848 impose on the next CODE_LABEL (or the current one if we are processing
849 the CODE_LABEL itself). */
854 for (insn
= get_insns (), i
= 1; insn
; insn
= NEXT_INSN (insn
))
858 INSN_SHUID (insn
) = i
++;
866 /* Merge in alignments computed by compute_alignments. */
867 log
= LABEL_TO_ALIGNMENT (insn
);
871 max_skip
= LABEL_TO_MAX_SKIP (insn
);
874 log
= LABEL_ALIGN (insn
);
878 max_skip
= LABEL_ALIGN_MAX_SKIP
;
880 next
= next_nonnote_insn (insn
);
881 /* ADDR_VECs only take room if read-only data goes into the text
883 if (JUMP_TABLES_IN_TEXT_SECTION
884 || readonly_data_section
== text_section
)
885 if (next
&& JUMP_P (next
))
887 rtx nextbody
= PATTERN (next
);
888 if (GET_CODE (nextbody
) == ADDR_VEC
889 || GET_CODE (nextbody
) == ADDR_DIFF_VEC
)
891 log
= ADDR_VEC_ALIGN (next
);
895 max_skip
= LABEL_ALIGN_MAX_SKIP
;
899 LABEL_TO_ALIGNMENT (insn
) = max_log
;
900 LABEL_TO_MAX_SKIP (insn
) = max_skip
;
904 else if (BARRIER_P (insn
))
908 for (label
= insn
; label
&& ! INSN_P (label
);
909 label
= NEXT_INSN (label
))
912 log
= LABEL_ALIGN_AFTER_BARRIER (insn
);
916 max_skip
= LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP
;
922 #ifdef HAVE_ATTR_length
924 /* Allocate the rest of the arrays. */
925 insn_lengths
= XNEWVEC (int, max_uid
);
926 insn_lengths_max_uid
= max_uid
;
927 /* Syntax errors can lead to labels being outside of the main insn stream.
928 Initialize insn_addresses, so that we get reproducible results. */
929 INSN_ADDRESSES_ALLOC (max_uid
);
931 varying_length
= XCNEWVEC (char, max_uid
);
933 /* Initialize uid_align. We scan instructions
934 from end to start, and keep in align_tab[n] the last seen insn
935 that does an alignment of at least n+1, i.e. the successor
936 in the alignment chain for an insn that does / has a known
938 uid_align
= XCNEWVEC (rtx
, max_uid
);
940 for (i
= MAX_CODE_ALIGN
; --i
>= 0;)
941 align_tab
[i
] = NULL_RTX
;
942 seq
= get_last_insn ();
943 for (; seq
; seq
= PREV_INSN (seq
))
945 int uid
= INSN_UID (seq
);
947 log
= (LABEL_P (seq
) ? LABEL_TO_ALIGNMENT (seq
) : 0);
948 uid_align
[uid
] = align_tab
[0];
951 /* Found an alignment label. */
952 uid_align
[uid
] = align_tab
[log
];
953 for (i
= log
- 1; i
>= 0; i
--)
957 #ifdef CASE_VECTOR_SHORTEN_MODE
960 /* Look for ADDR_DIFF_VECs, and initialize their minimum and maximum
963 int min_shuid
= INSN_SHUID (get_insns ()) - 1;
964 int max_shuid
= INSN_SHUID (get_last_insn ()) + 1;
967 for (insn
= first
; insn
!= 0; insn
= NEXT_INSN (insn
))
969 rtx min_lab
= NULL_RTX
, max_lab
= NULL_RTX
, pat
;
970 int len
, i
, min
, max
, insn_shuid
;
972 addr_diff_vec_flags flags
;
975 || GET_CODE (PATTERN (insn
)) != ADDR_DIFF_VEC
)
977 pat
= PATTERN (insn
);
978 len
= XVECLEN (pat
, 1);
979 gcc_assert (len
> 0);
980 min_align
= MAX_CODE_ALIGN
;
981 for (min
= max_shuid
, max
= min_shuid
, i
= len
- 1; i
>= 0; i
--)
983 rtx lab
= XEXP (XVECEXP (pat
, 1, i
), 0);
984 int shuid
= INSN_SHUID (lab
);
995 if (min_align
> LABEL_TO_ALIGNMENT (lab
))
996 min_align
= LABEL_TO_ALIGNMENT (lab
);
998 XEXP (pat
, 2) = gen_rtx_LABEL_REF (Pmode
, min_lab
);
999 XEXP (pat
, 3) = gen_rtx_LABEL_REF (Pmode
, max_lab
);
1000 insn_shuid
= INSN_SHUID (insn
);
1001 rel
= INSN_SHUID (XEXP (XEXP (pat
, 0), 0));
1002 memset (&flags
, 0, sizeof (flags
));
1003 flags
.min_align
= min_align
;
1004 flags
.base_after_vec
= rel
> insn_shuid
;
1005 flags
.min_after_vec
= min
> insn_shuid
;
1006 flags
.max_after_vec
= max
> insn_shuid
;
1007 flags
.min_after_base
= min
> rel
;
1008 flags
.max_after_base
= max
> rel
;
1009 ADDR_DIFF_VEC_FLAGS (pat
) = flags
;
1012 #endif /* CASE_VECTOR_SHORTEN_MODE */
1014 /* Compute initial lengths, addresses, and varying flags for each insn. */
1015 for (insn_current_address
= 0, insn
= first
;
1017 insn_current_address
+= insn_lengths
[uid
], insn
= NEXT_INSN (insn
))
1019 uid
= INSN_UID (insn
);
1021 insn_lengths
[uid
] = 0;
1025 int log
= LABEL_TO_ALIGNMENT (insn
);
1028 int align
= 1 << log
;
1029 int new_address
= (insn_current_address
+ align
- 1) & -align
;
1030 insn_lengths
[uid
] = new_address
- insn_current_address
;
1034 INSN_ADDRESSES (uid
) = insn_current_address
+ insn_lengths
[uid
];
1036 if (NOTE_P (insn
) || BARRIER_P (insn
)
1039 if (INSN_DELETED_P (insn
))
1042 body
= PATTERN (insn
);
1043 if (GET_CODE (body
) == ADDR_VEC
|| GET_CODE (body
) == ADDR_DIFF_VEC
)
1045 /* This only takes room if read-only data goes into the text
1047 if (JUMP_TABLES_IN_TEXT_SECTION
1048 || readonly_data_section
== text_section
)
1049 insn_lengths
[uid
] = (XVECLEN (body
,
1050 GET_CODE (body
) == ADDR_DIFF_VEC
)
1051 * GET_MODE_SIZE (GET_MODE (body
)));
1052 /* Alignment is handled by ADDR_VEC_ALIGN. */
1054 else if (GET_CODE (body
) == ASM_INPUT
|| asm_noperands (body
) >= 0)
1055 insn_lengths
[uid
] = asm_insn_count (body
) * insn_default_length (insn
);
1056 else if (GET_CODE (body
) == SEQUENCE
)
1059 int const_delay_slots
;
1061 const_delay_slots
= const_num_delay_slots (XVECEXP (body
, 0, 0));
1063 const_delay_slots
= 0;
1065 /* Inside a delay slot sequence, we do not do any branch shortening
1066 if the shortening could change the number of delay slots
1068 for (i
= 0; i
< XVECLEN (body
, 0); i
++)
1070 rtx inner_insn
= XVECEXP (body
, 0, i
);
1071 int inner_uid
= INSN_UID (inner_insn
);
1074 if (GET_CODE (body
) == ASM_INPUT
1075 || asm_noperands (PATTERN (XVECEXP (body
, 0, i
))) >= 0)
1076 inner_length
= (asm_insn_count (PATTERN (inner_insn
))
1077 * insn_default_length (inner_insn
));
1079 inner_length
= insn_default_length (inner_insn
);
1081 insn_lengths
[inner_uid
] = inner_length
;
1082 if (const_delay_slots
)
1084 if ((varying_length
[inner_uid
]
1085 = insn_variable_length_p (inner_insn
)) != 0)
1086 varying_length
[uid
] = 1;
1087 INSN_ADDRESSES (inner_uid
) = (insn_current_address
1088 + insn_lengths
[uid
]);
1091 varying_length
[inner_uid
] = 0;
1092 insn_lengths
[uid
] += inner_length
;
1095 else if (GET_CODE (body
) != USE
&& GET_CODE (body
) != CLOBBER
)
1097 insn_lengths
[uid
] = insn_default_length (insn
);
1098 varying_length
[uid
] = insn_variable_length_p (insn
);
1101 /* If needed, do any adjustment. */
1102 #ifdef ADJUST_INSN_LENGTH
1103 ADJUST_INSN_LENGTH (insn
, insn_lengths
[uid
]);
1104 if (insn_lengths
[uid
] < 0)
1105 fatal_insn ("negative insn length", insn
);
1109 /* Now loop over all the insns finding varying length insns. For each,
1110 get the current insn length. If it has changed, reflect the change.
1111 When nothing changes for a full pass, we are done. */
1113 while (something_changed
)
1115 something_changed
= 0;
1116 insn_current_align
= MAX_CODE_ALIGN
- 1;
1117 for (insn_current_address
= 0, insn
= first
;
1119 insn
= NEXT_INSN (insn
))
1122 #ifdef ADJUST_INSN_LENGTH
1127 uid
= INSN_UID (insn
);
1131 int log
= LABEL_TO_ALIGNMENT (insn
);
1132 if (log
> insn_current_align
)
1134 int align
= 1 << log
;
1135 int new_address
= (insn_current_address
+ align
- 1) & -align
;
1136 insn_lengths
[uid
] = new_address
- insn_current_address
;
1137 insn_current_align
= log
;
1138 insn_current_address
= new_address
;
1141 insn_lengths
[uid
] = 0;
1142 INSN_ADDRESSES (uid
) = insn_current_address
;
1146 length_align
= INSN_LENGTH_ALIGNMENT (insn
);
1147 if (length_align
< insn_current_align
)
1148 insn_current_align
= length_align
;
1150 insn_last_address
= INSN_ADDRESSES (uid
);
1151 INSN_ADDRESSES (uid
) = insn_current_address
;
1153 #ifdef CASE_VECTOR_SHORTEN_MODE
1154 if (optimize
&& JUMP_P (insn
)
1155 && GET_CODE (PATTERN (insn
)) == ADDR_DIFF_VEC
)
1157 rtx body
= PATTERN (insn
);
1158 int old_length
= insn_lengths
[uid
];
1159 rtx rel_lab
= XEXP (XEXP (body
, 0), 0);
1160 rtx min_lab
= XEXP (XEXP (body
, 2), 0);
1161 rtx max_lab
= XEXP (XEXP (body
, 3), 0);
1162 int rel_addr
= INSN_ADDRESSES (INSN_UID (rel_lab
));
1163 int min_addr
= INSN_ADDRESSES (INSN_UID (min_lab
));
1164 int max_addr
= INSN_ADDRESSES (INSN_UID (max_lab
));
1167 addr_diff_vec_flags flags
;
1169 /* Avoid automatic aggregate initialization. */
1170 flags
= ADDR_DIFF_VEC_FLAGS (body
);
1172 /* Try to find a known alignment for rel_lab. */
1173 for (prev
= rel_lab
;
1175 && ! insn_lengths
[INSN_UID (prev
)]
1176 && ! (varying_length
[INSN_UID (prev
)] & 1);
1177 prev
= PREV_INSN (prev
))
1178 if (varying_length
[INSN_UID (prev
)] & 2)
1180 rel_align
= LABEL_TO_ALIGNMENT (prev
);
1184 /* See the comment on addr_diff_vec_flags in rtl.h for the
1185 meaning of the flags values. base: REL_LAB vec: INSN */
1186 /* Anything after INSN has still addresses from the last
1187 pass; adjust these so that they reflect our current
1188 estimate for this pass. */
1189 if (flags
.base_after_vec
)
1190 rel_addr
+= insn_current_address
- insn_last_address
;
1191 if (flags
.min_after_vec
)
1192 min_addr
+= insn_current_address
- insn_last_address
;
1193 if (flags
.max_after_vec
)
1194 max_addr
+= insn_current_address
- insn_last_address
;
1195 /* We want to know the worst case, i.e. lowest possible value
1196 for the offset of MIN_LAB. If MIN_LAB is after REL_LAB,
1197 its offset is positive, and we have to be wary of code shrink;
1198 otherwise, it is negative, and we have to be vary of code
1200 if (flags
.min_after_base
)
1202 /* If INSN is between REL_LAB and MIN_LAB, the size
1203 changes we are about to make can change the alignment
1204 within the observed offset, therefore we have to break
1205 it up into two parts that are independent. */
1206 if (! flags
.base_after_vec
&& flags
.min_after_vec
)
1208 min_addr
-= align_fuzz (rel_lab
, insn
, rel_align
, 0);
1209 min_addr
-= align_fuzz (insn
, min_lab
, 0, 0);
1212 min_addr
-= align_fuzz (rel_lab
, min_lab
, rel_align
, 0);
1216 if (flags
.base_after_vec
&& ! flags
.min_after_vec
)
1218 min_addr
-= align_fuzz (min_lab
, insn
, 0, ~0);
1219 min_addr
-= align_fuzz (insn
, rel_lab
, 0, ~0);
1222 min_addr
-= align_fuzz (min_lab
, rel_lab
, 0, ~0);
1224 /* Likewise, determine the highest lowest possible value
1225 for the offset of MAX_LAB. */
1226 if (flags
.max_after_base
)
1228 if (! flags
.base_after_vec
&& flags
.max_after_vec
)
1230 max_addr
+= align_fuzz (rel_lab
, insn
, rel_align
, ~0);
1231 max_addr
+= align_fuzz (insn
, max_lab
, 0, ~0);
1234 max_addr
+= align_fuzz (rel_lab
, max_lab
, rel_align
, ~0);
1238 if (flags
.base_after_vec
&& ! flags
.max_after_vec
)
1240 max_addr
+= align_fuzz (max_lab
, insn
, 0, 0);
1241 max_addr
+= align_fuzz (insn
, rel_lab
, 0, 0);
1244 max_addr
+= align_fuzz (max_lab
, rel_lab
, 0, 0);
1246 PUT_MODE (body
, CASE_VECTOR_SHORTEN_MODE (min_addr
- rel_addr
,
1247 max_addr
- rel_addr
,
1249 if (JUMP_TABLES_IN_TEXT_SECTION
1250 || readonly_data_section
== text_section
)
1253 = (XVECLEN (body
, 1) * GET_MODE_SIZE (GET_MODE (body
)));
1254 insn_current_address
+= insn_lengths
[uid
];
1255 if (insn_lengths
[uid
] != old_length
)
1256 something_changed
= 1;
1261 #endif /* CASE_VECTOR_SHORTEN_MODE */
1263 if (! (varying_length
[uid
]))
1265 if (NONJUMP_INSN_P (insn
)
1266 && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
1270 body
= PATTERN (insn
);
1271 for (i
= 0; i
< XVECLEN (body
, 0); i
++)
1273 rtx inner_insn
= XVECEXP (body
, 0, i
);
1274 int inner_uid
= INSN_UID (inner_insn
);
1276 INSN_ADDRESSES (inner_uid
) = insn_current_address
;
1278 insn_current_address
+= insn_lengths
[inner_uid
];
1282 insn_current_address
+= insn_lengths
[uid
];
1287 if (NONJUMP_INSN_P (insn
) && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
1291 body
= PATTERN (insn
);
1293 for (i
= 0; i
< XVECLEN (body
, 0); i
++)
1295 rtx inner_insn
= XVECEXP (body
, 0, i
);
1296 int inner_uid
= INSN_UID (inner_insn
);
1299 INSN_ADDRESSES (inner_uid
) = insn_current_address
;
1301 /* insn_current_length returns 0 for insns with a
1302 non-varying length. */
1303 if (! varying_length
[inner_uid
])
1304 inner_length
= insn_lengths
[inner_uid
];
1306 inner_length
= insn_current_length (inner_insn
);
1308 if (inner_length
!= insn_lengths
[inner_uid
])
1310 insn_lengths
[inner_uid
] = inner_length
;
1311 something_changed
= 1;
1313 insn_current_address
+= insn_lengths
[inner_uid
];
1314 new_length
+= inner_length
;
1319 new_length
= insn_current_length (insn
);
1320 insn_current_address
+= new_length
;
1323 #ifdef ADJUST_INSN_LENGTH
1324 /* If needed, do any adjustment. */
1325 tmp_length
= new_length
;
1326 ADJUST_INSN_LENGTH (insn
, new_length
);
1327 insn_current_address
+= (new_length
- tmp_length
);
1330 if (new_length
!= insn_lengths
[uid
])
1332 insn_lengths
[uid
] = new_length
;
1333 something_changed
= 1;
1336 /* For a non-optimizing compile, do only a single pass. */
1341 free (varying_length
);
1343 #endif /* HAVE_ATTR_length */
1346 #ifdef HAVE_ATTR_length
1347 /* Given the body of an INSN known to be generated by an ASM statement, return
1348 the number of machine instructions likely to be generated for this insn.
1349 This is used to compute its length. */
1352 asm_insn_count (rtx body
)
1354 const char *template;
1357 if (GET_CODE (body
) == ASM_INPUT
)
1358 template = XSTR (body
, 0);
1360 template = decode_asm_operands (body
, NULL
, NULL
, NULL
, NULL
, NULL
);
1362 for (; *template; template++)
1363 if (IS_ASM_LOGICAL_LINE_SEPARATOR (*template) || *template == '\n')
1370 /* Output assembler code for the start of a function,
1371 and initialize some of the variables in this file
1372 for the new function. The label for the function and associated
1373 assembler pseudo-ops have already been output in `assemble_start_function'.
1375 FIRST is the first insn of the rtl for the function being compiled.
1376 FILE is the file to write assembler code to.
1377 OPTIMIZE is nonzero if we should eliminate redundant
1378 test and compare insns. */
1381 final_start_function (rtx first ATTRIBUTE_UNUSED
, FILE *file
,
1382 int optimize ATTRIBUTE_UNUSED
)
1386 this_is_asm_operands
= 0;
1388 last_filename
= locator_file (prologue_locator
);
1389 last_linenum
= locator_line (prologue_locator
);
1391 high_block_linenum
= high_function_linenum
= last_linenum
;
1393 (*debug_hooks
->begin_prologue
) (last_linenum
, last_filename
);
1395 #if defined (DWARF2_UNWIND_INFO) || defined (TARGET_UNWIND_INFO)
1396 if (write_symbols
!= DWARF2_DEBUG
&& write_symbols
!= VMS_AND_DWARF2_DEBUG
)
1397 dwarf2out_begin_prologue (0, NULL
);
1400 #ifdef LEAF_REG_REMAP
1401 if (current_function_uses_only_leaf_regs
)
1402 leaf_renumber_regs (first
);
1405 /* The Sun386i and perhaps other machines don't work right
1406 if the profiling code comes after the prologue. */
1407 #ifdef PROFILE_BEFORE_PROLOGUE
1408 if (current_function_profile
)
1409 profile_function (file
);
1410 #endif /* PROFILE_BEFORE_PROLOGUE */
1412 #if defined (DWARF2_UNWIND_INFO) && defined (HAVE_prologue)
1413 if (dwarf2out_do_frame ())
1414 dwarf2out_frame_debug (NULL_RTX
, false);
1417 /* If debugging, assign block numbers to all of the blocks in this
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
= 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
:
1703 case NOTE_INSN_SWITCH_TEXT_SECTIONS
:
1704 in_cold_section_p
= !in_cold_section_p
;
1705 (*debug_hooks
->switch_text_section
) ();
1706 switch_to_section (current_function_section ());
1709 case NOTE_INSN_BASIC_BLOCK
:
1710 #ifdef TARGET_UNWIND_INFO
1711 targetm
.asm_out
.unwind_emit (asm_out_file
, insn
);
1715 fprintf (asm_out_file
, "\t%s basic block %d\n",
1716 ASM_COMMENT_START
, NOTE_BASIC_BLOCK (insn
)->index
);
1718 if ((*seen
& (SEEN_EMITTED
| SEEN_BB
)) == SEEN_BB
)
1720 *seen
|= SEEN_EMITTED
;
1721 force_source_line
= true;
1728 case NOTE_INSN_EH_REGION_BEG
:
1729 ASM_OUTPUT_DEBUG_LABEL (asm_out_file
, "LEHB",
1730 NOTE_EH_HANDLER (insn
));
1733 case NOTE_INSN_EH_REGION_END
:
1734 ASM_OUTPUT_DEBUG_LABEL (asm_out_file
, "LEHE",
1735 NOTE_EH_HANDLER (insn
));
1738 case NOTE_INSN_PROLOGUE_END
:
1739 targetm
.asm_out
.function_end_prologue (file
);
1740 profile_after_prologue (file
);
1742 if ((*seen
& (SEEN_EMITTED
| SEEN_NOTE
)) == SEEN_NOTE
)
1744 *seen
|= SEEN_EMITTED
;
1745 force_source_line
= true;
1752 case NOTE_INSN_EPILOGUE_BEG
:
1753 targetm
.asm_out
.function_begin_epilogue (file
);
1756 case NOTE_INSN_FUNCTION_BEG
:
1758 (*debug_hooks
->end_prologue
) (last_linenum
, last_filename
);
1760 if ((*seen
& (SEEN_EMITTED
| SEEN_NOTE
)) == SEEN_NOTE
)
1762 *seen
|= SEEN_EMITTED
;
1763 force_source_line
= true;
1770 case NOTE_INSN_BLOCK_BEG
:
1771 if (debug_info_level
== DINFO_LEVEL_NORMAL
1772 || debug_info_level
== DINFO_LEVEL_VERBOSE
1773 || write_symbols
== DWARF2_DEBUG
1774 || write_symbols
== VMS_AND_DWARF2_DEBUG
1775 || write_symbols
== VMS_DEBUG
)
1777 int n
= BLOCK_NUMBER (NOTE_BLOCK (insn
));
1781 high_block_linenum
= last_linenum
;
1783 /* Output debugging info about the symbol-block beginning. */
1784 (*debug_hooks
->begin_block
) (last_linenum
, n
);
1786 /* Mark this block as output. */
1787 TREE_ASM_WRITTEN (NOTE_BLOCK (insn
)) = 1;
1791 case NOTE_INSN_BLOCK_END
:
1792 if (debug_info_level
== DINFO_LEVEL_NORMAL
1793 || debug_info_level
== DINFO_LEVEL_VERBOSE
1794 || write_symbols
== DWARF2_DEBUG
1795 || write_symbols
== VMS_AND_DWARF2_DEBUG
1796 || write_symbols
== VMS_DEBUG
)
1798 int n
= BLOCK_NUMBER (NOTE_BLOCK (insn
));
1802 /* End of a symbol-block. */
1804 gcc_assert (block_depth
>= 0);
1806 (*debug_hooks
->end_block
) (high_block_linenum
, n
);
1810 case NOTE_INSN_DELETED_LABEL
:
1811 /* Emit the label. We may have deleted the CODE_LABEL because
1812 the label could be proved to be unreachable, though still
1813 referenced (in the form of having its address taken. */
1814 ASM_OUTPUT_DEBUG_LABEL (file
, "L", CODE_LABEL_NUMBER (insn
));
1817 case NOTE_INSN_VAR_LOCATION
:
1818 (*debug_hooks
->var_location
) (insn
);
1825 gcc_assert (NOTE_LINE_NUMBER (insn
) > 0);
1831 #if defined (DWARF2_UNWIND_INFO)
1832 if (dwarf2out_do_frame ())
1833 dwarf2out_frame_debug (insn
, false);
1838 /* The target port might emit labels in the output function for
1839 some insn, e.g. sh.c output_branchy_insn. */
1840 if (CODE_LABEL_NUMBER (insn
) <= max_labelno
)
1842 int align
= LABEL_TO_ALIGNMENT (insn
);
1843 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1844 int max_skip
= LABEL_TO_MAX_SKIP (insn
);
1847 if (align
&& NEXT_INSN (insn
))
1849 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1850 ASM_OUTPUT_MAX_SKIP_ALIGN (file
, align
, max_skip
);
1852 #ifdef ASM_OUTPUT_ALIGN_WITH_NOP
1853 ASM_OUTPUT_ALIGN_WITH_NOP (file
, align
);
1855 ASM_OUTPUT_ALIGN (file
, align
);
1862 /* If this label is reached from only one place, set the condition
1863 codes from the instruction just before the branch. */
1865 /* Disabled because some insns set cc_status in the C output code
1866 and NOTICE_UPDATE_CC alone can set incorrect status. */
1867 if (0 /* optimize && LABEL_NUSES (insn) == 1*/)
1869 rtx jump
= LABEL_REFS (insn
);
1870 rtx barrier
= prev_nonnote_insn (insn
);
1872 /* If the LABEL_REFS field of this label has been set to point
1873 at a branch, the predecessor of the branch is a regular
1874 insn, and that branch is the only way to reach this label,
1875 set the condition codes based on the branch and its
1877 if (barrier
&& BARRIER_P (barrier
)
1878 && jump
&& JUMP_P (jump
)
1879 && (prev
= prev_nonnote_insn (jump
))
1880 && NONJUMP_INSN_P (prev
))
1882 NOTICE_UPDATE_CC (PATTERN (prev
), prev
);
1883 NOTICE_UPDATE_CC (PATTERN (jump
), jump
);
1888 if (LABEL_NAME (insn
))
1889 (*debug_hooks
->label
) (insn
);
1893 fputs (ASM_APP_OFF
, file
);
1897 next
= next_nonnote_insn (insn
);
1898 if (next
!= 0 && JUMP_P (next
))
1900 rtx nextbody
= PATTERN (next
);
1902 /* If this label is followed by a jump-table,
1903 make sure we put the label in the read-only section. Also
1904 possibly write the label and jump table together. */
1906 if (GET_CODE (nextbody
) == ADDR_VEC
1907 || GET_CODE (nextbody
) == ADDR_DIFF_VEC
)
1909 #if defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC)
1910 /* In this case, the case vector is being moved by the
1911 target, so don't output the label at all. Leave that
1912 to the back end macros. */
1914 if (! JUMP_TABLES_IN_TEXT_SECTION
)
1918 switch_to_section (targetm
.asm_out
.function_rodata_section
1919 (current_function_decl
));
1921 #ifdef ADDR_VEC_ALIGN
1922 log_align
= ADDR_VEC_ALIGN (next
);
1924 log_align
= exact_log2 (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
);
1926 ASM_OUTPUT_ALIGN (file
, log_align
);
1929 switch_to_section (current_function_section ());
1931 #ifdef ASM_OUTPUT_CASE_LABEL
1932 ASM_OUTPUT_CASE_LABEL (file
, "L", CODE_LABEL_NUMBER (insn
),
1935 targetm
.asm_out
.internal_label (file
, "L", CODE_LABEL_NUMBER (insn
));
1941 if (LABEL_ALT_ENTRY_P (insn
))
1942 output_alternate_entry_point (file
, insn
);
1944 targetm
.asm_out
.internal_label (file
, "L", CODE_LABEL_NUMBER (insn
));
1949 rtx body
= PATTERN (insn
);
1950 int insn_code_number
;
1951 const char *template;
1953 #ifdef HAVE_conditional_execution
1954 /* Reset this early so it is correct for ASM statements. */
1955 current_insn_predicate
= NULL_RTX
;
1957 /* An INSN, JUMP_INSN or CALL_INSN.
1958 First check for special kinds that recog doesn't recognize. */
1960 if (GET_CODE (body
) == USE
/* These are just declarations. */
1961 || GET_CODE (body
) == CLOBBER
)
1966 /* If there is a REG_CC_SETTER note on this insn, it means that
1967 the setting of the condition code was done in the delay slot
1968 of the insn that branched here. So recover the cc status
1969 from the insn that set it. */
1971 rtx note
= find_reg_note (insn
, REG_CC_SETTER
, NULL_RTX
);
1974 NOTICE_UPDATE_CC (PATTERN (XEXP (note
, 0)), XEXP (note
, 0));
1975 cc_prev_status
= cc_status
;
1980 /* Detect insns that are really jump-tables
1981 and output them as such. */
1983 if (GET_CODE (body
) == ADDR_VEC
|| GET_CODE (body
) == ADDR_DIFF_VEC
)
1985 #if !(defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC))
1989 if (! JUMP_TABLES_IN_TEXT_SECTION
)
1990 switch_to_section (targetm
.asm_out
.function_rodata_section
1991 (current_function_decl
));
1993 switch_to_section (current_function_section ());
1997 fputs (ASM_APP_OFF
, file
);
2001 #if defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC)
2002 if (GET_CODE (body
) == ADDR_VEC
)
2004 #ifdef ASM_OUTPUT_ADDR_VEC
2005 ASM_OUTPUT_ADDR_VEC (PREV_INSN (insn
), body
);
2012 #ifdef ASM_OUTPUT_ADDR_DIFF_VEC
2013 ASM_OUTPUT_ADDR_DIFF_VEC (PREV_INSN (insn
), body
);
2019 vlen
= XVECLEN (body
, GET_CODE (body
) == ADDR_DIFF_VEC
);
2020 for (idx
= 0; idx
< vlen
; idx
++)
2022 if (GET_CODE (body
) == ADDR_VEC
)
2024 #ifdef ASM_OUTPUT_ADDR_VEC_ELT
2025 ASM_OUTPUT_ADDR_VEC_ELT
2026 (file
, CODE_LABEL_NUMBER (XEXP (XVECEXP (body
, 0, idx
), 0)));
2033 #ifdef ASM_OUTPUT_ADDR_DIFF_ELT
2034 ASM_OUTPUT_ADDR_DIFF_ELT
2037 CODE_LABEL_NUMBER (XEXP (XVECEXP (body
, 1, idx
), 0)),
2038 CODE_LABEL_NUMBER (XEXP (XEXP (body
, 0), 0)));
2044 #ifdef ASM_OUTPUT_CASE_END
2045 ASM_OUTPUT_CASE_END (file
,
2046 CODE_LABEL_NUMBER (PREV_INSN (insn
)),
2051 switch_to_section (current_function_section ());
2055 /* Output this line note if it is the first or the last line
2057 if (notice_source_line (insn
))
2059 (*debug_hooks
->source_line
) (last_linenum
, last_filename
);
2062 if (GET_CODE (body
) == ASM_INPUT
)
2064 const char *string
= XSTR (body
, 0);
2066 /* There's no telling what that did to the condition codes. */
2075 fputs (ASM_APP_ON
, file
);
2078 #ifdef USE_MAPPED_LOCATION
2079 loc
= ASM_INPUT_SOURCE_LOCATION (body
);
2081 loc
.file
= ASM_INPUT_SOURCE_FILE (body
);
2082 loc
.line
= ASM_INPUT_SOURCE_LINE (body
);
2084 if (*loc
.file
&& loc
.line
)
2085 fprintf (asm_out_file
, "%s %i \"%s\" 1\n",
2086 ASM_COMMENT_START
, loc
.line
, loc
.file
);
2087 fprintf (asm_out_file
, "\t%s\n", string
);
2088 #if HAVE_AS_LINE_ZERO
2089 if (*loc
.file
&& loc
.line
)
2090 fprintf (asm_out_file
, "%s 0 \"\" 2\n", ASM_COMMENT_START
);
2096 /* Detect `asm' construct with operands. */
2097 if (asm_noperands (body
) >= 0)
2099 unsigned int noperands
= asm_noperands (body
);
2100 rtx
*ops
= alloca (noperands
* sizeof (rtx
));
2104 /* There's no telling what that did to the condition codes. */
2107 /* Get out the operand values. */
2108 string
= decode_asm_operands (body
, ops
, NULL
, NULL
, NULL
, &loc
);
2109 /* Inhibit dieing on what would otherwise be compiler bugs. */
2110 insn_noperands
= noperands
;
2111 this_is_asm_operands
= insn
;
2113 #ifdef FINAL_PRESCAN_INSN
2114 FINAL_PRESCAN_INSN (insn
, ops
, insn_noperands
);
2117 /* Output the insn using them. */
2122 fputs (ASM_APP_ON
, file
);
2125 if (loc
.file
&& loc
.line
)
2126 fprintf (asm_out_file
, "%s %i \"%s\" 1\n",
2127 ASM_COMMENT_START
, loc
.line
, loc
.file
);
2128 output_asm_insn (string
, ops
);
2129 #if HAVE_AS_LINE_ZERO
2130 if (loc
.file
&& loc
.line
)
2131 fprintf (asm_out_file
, "%s 0 \"\" 2\n", ASM_COMMENT_START
);
2135 this_is_asm_operands
= 0;
2141 fputs (ASM_APP_OFF
, file
);
2145 if (GET_CODE (body
) == SEQUENCE
)
2147 /* A delayed-branch sequence */
2150 final_sequence
= body
;
2152 /* Record the delay slots' frame information before the branch.
2153 This is needed for delayed calls: see execute_cfa_program(). */
2154 #if defined (DWARF2_UNWIND_INFO)
2155 if (dwarf2out_do_frame ())
2156 for (i
= 1; i
< XVECLEN (body
, 0); i
++)
2157 dwarf2out_frame_debug (XVECEXP (body
, 0, i
), false);
2160 /* The first insn in this SEQUENCE might be a JUMP_INSN that will
2161 force the restoration of a comparison that was previously
2162 thought unnecessary. If that happens, cancel this sequence
2163 and cause that insn to be restored. */
2165 next
= final_scan_insn (XVECEXP (body
, 0, 0), file
, 0, 1, seen
);
2166 if (next
!= XVECEXP (body
, 0, 1))
2172 for (i
= 1; i
< XVECLEN (body
, 0); i
++)
2174 rtx insn
= XVECEXP (body
, 0, i
);
2175 rtx next
= NEXT_INSN (insn
);
2176 /* We loop in case any instruction in a delay slot gets
2179 insn
= final_scan_insn (insn
, file
, 0, 1, seen
);
2180 while (insn
!= next
);
2182 #ifdef DBR_OUTPUT_SEQEND
2183 DBR_OUTPUT_SEQEND (file
);
2187 /* If the insn requiring the delay slot was a CALL_INSN, the
2188 insns in the delay slot are actually executed before the
2189 called function. Hence we don't preserve any CC-setting
2190 actions in these insns and the CC must be marked as being
2191 clobbered by the function. */
2192 if (CALL_P (XVECEXP (body
, 0, 0)))
2199 /* We have a real machine instruction as rtl. */
2201 body
= PATTERN (insn
);
2204 set
= single_set (insn
);
2206 /* Check for redundant test and compare instructions
2207 (when the condition codes are already set up as desired).
2208 This is done only when optimizing; if not optimizing,
2209 it should be possible for the user to alter a variable
2210 with the debugger in between statements
2211 and the next statement should reexamine the variable
2212 to compute the condition codes. */
2217 && GET_CODE (SET_DEST (set
)) == CC0
2218 && insn
!= last_ignored_compare
)
2220 if (GET_CODE (SET_SRC (set
)) == SUBREG
)
2221 SET_SRC (set
) = alter_subreg (&SET_SRC (set
));
2222 else if (GET_CODE (SET_SRC (set
)) == COMPARE
)
2224 if (GET_CODE (XEXP (SET_SRC (set
), 0)) == SUBREG
)
2225 XEXP (SET_SRC (set
), 0)
2226 = alter_subreg (&XEXP (SET_SRC (set
), 0));
2227 if (GET_CODE (XEXP (SET_SRC (set
), 1)) == SUBREG
)
2228 XEXP (SET_SRC (set
), 1)
2229 = alter_subreg (&XEXP (SET_SRC (set
), 1));
2231 if ((cc_status
.value1
!= 0
2232 && rtx_equal_p (SET_SRC (set
), cc_status
.value1
))
2233 || (cc_status
.value2
!= 0
2234 && rtx_equal_p (SET_SRC (set
), cc_status
.value2
)))
2236 /* Don't delete insn if it has an addressing side-effect. */
2237 if (! FIND_REG_INC_NOTE (insn
, NULL_RTX
)
2238 /* or if anything in it is volatile. */
2239 && ! volatile_refs_p (PATTERN (insn
)))
2241 /* We don't really delete the insn; just ignore it. */
2242 last_ignored_compare
= insn
;
2251 /* If this is a conditional branch, maybe modify it
2252 if the cc's are in a nonstandard state
2253 so that it accomplishes the same thing that it would
2254 do straightforwardly if the cc's were set up normally. */
2256 if (cc_status
.flags
!= 0
2258 && GET_CODE (body
) == SET
2259 && SET_DEST (body
) == pc_rtx
2260 && GET_CODE (SET_SRC (body
)) == IF_THEN_ELSE
2261 && COMPARISON_P (XEXP (SET_SRC (body
), 0))
2262 && XEXP (XEXP (SET_SRC (body
), 0), 0) == cc0_rtx
)
2264 /* This function may alter the contents of its argument
2265 and clear some of the cc_status.flags bits.
2266 It may also return 1 meaning condition now always true
2267 or -1 meaning condition now always false
2268 or 2 meaning condition nontrivial but altered. */
2269 int result
= alter_cond (XEXP (SET_SRC (body
), 0));
2270 /* If condition now has fixed value, replace the IF_THEN_ELSE
2271 with its then-operand or its else-operand. */
2273 SET_SRC (body
) = XEXP (SET_SRC (body
), 1);
2275 SET_SRC (body
) = XEXP (SET_SRC (body
), 2);
2277 /* The jump is now either unconditional or a no-op.
2278 If it has become a no-op, don't try to output it.
2279 (It would not be recognized.) */
2280 if (SET_SRC (body
) == pc_rtx
)
2285 else if (GET_CODE (SET_SRC (body
)) == RETURN
)
2286 /* Replace (set (pc) (return)) with (return). */
2287 PATTERN (insn
) = body
= SET_SRC (body
);
2289 /* Rerecognize the instruction if it has changed. */
2291 INSN_CODE (insn
) = -1;
2294 /* If this is a conditional trap, maybe modify it if the cc's
2295 are in a nonstandard state so that it accomplishes the same
2296 thing that it would do straightforwardly if the cc's were
2298 if (cc_status
.flags
!= 0
2299 && NONJUMP_INSN_P (insn
)
2300 && GET_CODE (body
) == TRAP_IF
2301 && COMPARISON_P (TRAP_CONDITION (body
))
2302 && XEXP (TRAP_CONDITION (body
), 0) == cc0_rtx
)
2304 /* This function may alter the contents of its argument
2305 and clear some of the cc_status.flags bits.
2306 It may also return 1 meaning condition now always true
2307 or -1 meaning condition now always false
2308 or 2 meaning condition nontrivial but altered. */
2309 int result
= alter_cond (TRAP_CONDITION (body
));
2311 /* If TRAP_CONDITION has become always false, delete the
2319 /* If TRAP_CONDITION has become always true, replace
2320 TRAP_CONDITION with const_true_rtx. */
2322 TRAP_CONDITION (body
) = const_true_rtx
;
2324 /* Rerecognize the instruction if it has changed. */
2326 INSN_CODE (insn
) = -1;
2329 /* If this is a conditional trap, maybe modify it if the cc's
2330 are in a nonstandard state so that it accomplishes the same
2331 thing that it would do straightforwardly if the cc's were
2333 if (cc_status
.flags
!= 0
2334 && NONJUMP_INSN_P (insn
)
2335 && GET_CODE (body
) == TRAP_IF
2336 && COMPARISON_P (TRAP_CONDITION (body
))
2337 && XEXP (TRAP_CONDITION (body
), 0) == cc0_rtx
)
2339 /* This function may alter the contents of its argument
2340 and clear some of the cc_status.flags bits.
2341 It may also return 1 meaning condition now always true
2342 or -1 meaning condition now always false
2343 or 2 meaning condition nontrivial but altered. */
2344 int result
= alter_cond (TRAP_CONDITION (body
));
2346 /* If TRAP_CONDITION has become always false, delete the
2354 /* If TRAP_CONDITION has become always true, replace
2355 TRAP_CONDITION with const_true_rtx. */
2357 TRAP_CONDITION (body
) = const_true_rtx
;
2359 /* Rerecognize the instruction if it has changed. */
2361 INSN_CODE (insn
) = -1;
2364 /* Make same adjustments to instructions that examine the
2365 condition codes without jumping and instructions that
2366 handle conditional moves (if this machine has either one). */
2368 if (cc_status
.flags
!= 0
2371 rtx cond_rtx
, then_rtx
, else_rtx
;
2374 && GET_CODE (SET_SRC (set
)) == IF_THEN_ELSE
)
2376 cond_rtx
= XEXP (SET_SRC (set
), 0);
2377 then_rtx
= XEXP (SET_SRC (set
), 1);
2378 else_rtx
= XEXP (SET_SRC (set
), 2);
2382 cond_rtx
= SET_SRC (set
);
2383 then_rtx
= const_true_rtx
;
2384 else_rtx
= const0_rtx
;
2387 switch (GET_CODE (cond_rtx
))
2401 if (XEXP (cond_rtx
, 0) != cc0_rtx
)
2403 result
= alter_cond (cond_rtx
);
2405 validate_change (insn
, &SET_SRC (set
), then_rtx
, 0);
2406 else if (result
== -1)
2407 validate_change (insn
, &SET_SRC (set
), else_rtx
, 0);
2408 else if (result
== 2)
2409 INSN_CODE (insn
) = -1;
2410 if (SET_DEST (set
) == SET_SRC (set
))
2422 #ifdef HAVE_peephole
2423 /* Do machine-specific peephole optimizations if desired. */
2425 if (optimize
&& !flag_no_peephole
&& !nopeepholes
)
2427 rtx next
= peephole (insn
);
2428 /* When peepholing, if there were notes within the peephole,
2429 emit them before the peephole. */
2430 if (next
!= 0 && next
!= NEXT_INSN (insn
))
2432 rtx note
, prev
= PREV_INSN (insn
);
2434 for (note
= NEXT_INSN (insn
); note
!= next
;
2435 note
= NEXT_INSN (note
))
2436 final_scan_insn (note
, file
, optimize
, nopeepholes
, seen
);
2438 /* Put the notes in the proper position for a later
2439 rescan. For example, the SH target can do this
2440 when generating a far jump in a delayed branch
2442 note
= NEXT_INSN (insn
);
2443 PREV_INSN (note
) = prev
;
2444 NEXT_INSN (prev
) = note
;
2445 NEXT_INSN (PREV_INSN (next
)) = insn
;
2446 PREV_INSN (insn
) = PREV_INSN (next
);
2447 NEXT_INSN (insn
) = next
;
2448 PREV_INSN (next
) = insn
;
2451 /* PEEPHOLE might have changed this. */
2452 body
= PATTERN (insn
);
2456 /* Try to recognize the instruction.
2457 If successful, verify that the operands satisfy the
2458 constraints for the instruction. Crash if they don't,
2459 since `reload' should have changed them so that they do. */
2461 insn_code_number
= recog_memoized (insn
);
2462 cleanup_subreg_operands (insn
);
2464 /* Dump the insn in the assembly for debugging. */
2465 if (flag_dump_rtl_in_asm
)
2467 print_rtx_head
= ASM_COMMENT_START
;
2468 print_rtl_single (asm_out_file
, insn
);
2469 print_rtx_head
= "";
2472 if (! constrain_operands_cached (1))
2473 fatal_insn_not_found (insn
);
2475 /* Some target machines need to prescan each insn before
2478 #ifdef FINAL_PRESCAN_INSN
2479 FINAL_PRESCAN_INSN (insn
, recog_data
.operand
, recog_data
.n_operands
);
2482 #ifdef HAVE_conditional_execution
2483 if (GET_CODE (PATTERN (insn
)) == COND_EXEC
)
2484 current_insn_predicate
= COND_EXEC_TEST (PATTERN (insn
));
2488 cc_prev_status
= cc_status
;
2490 /* Update `cc_status' for this instruction.
2491 The instruction's output routine may change it further.
2492 If the output routine for a jump insn needs to depend
2493 on the cc status, it should look at cc_prev_status. */
2495 NOTICE_UPDATE_CC (body
, insn
);
2498 current_output_insn
= debug_insn
= insn
;
2500 #if defined (DWARF2_UNWIND_INFO)
2501 if (CALL_P (insn
) && dwarf2out_do_frame ())
2502 dwarf2out_frame_debug (insn
, false);
2505 /* Find the proper template for this insn. */
2506 template = get_insn_template (insn_code_number
, insn
);
2508 /* If the C code returns 0, it means that it is a jump insn
2509 which follows a deleted test insn, and that test insn
2510 needs to be reinserted. */
2515 gcc_assert (prev_nonnote_insn (insn
) == last_ignored_compare
);
2517 /* We have already processed the notes between the setter and
2518 the user. Make sure we don't process them again, this is
2519 particularly important if one of the notes is a block
2520 scope note or an EH note. */
2522 prev
!= last_ignored_compare
;
2523 prev
= PREV_INSN (prev
))
2526 delete_insn (prev
); /* Use delete_note. */
2532 /* If the template is the string "#", it means that this insn must
2534 if (template[0] == '#' && template[1] == '\0')
2536 rtx
new = try_split (body
, insn
, 0);
2538 /* If we didn't split the insn, go away. */
2539 if (new == insn
&& PATTERN (new) == body
)
2540 fatal_insn ("could not split insn", insn
);
2542 #ifdef HAVE_ATTR_length
2543 /* This instruction should have been split in shorten_branches,
2544 to ensure that we would have valid length info for the
2552 #ifdef TARGET_UNWIND_INFO
2553 /* ??? This will put the directives in the wrong place if
2554 get_insn_template outputs assembly directly. However calling it
2555 before get_insn_template breaks if the insns is split. */
2556 targetm
.asm_out
.unwind_emit (asm_out_file
, insn
);
2559 /* Output assembler code from the template. */
2560 output_asm_insn (template, recog_data
.operand
);
2562 /* If necessary, report the effect that the instruction has on
2563 the unwind info. We've already done this for delay slots
2564 and call instructions. */
2565 #if defined (DWARF2_UNWIND_INFO)
2566 if (final_sequence
== 0
2567 #if !defined (HAVE_prologue)
2568 && !ACCUMULATE_OUTGOING_ARGS
2570 && dwarf2out_do_frame ())
2571 dwarf2out_frame_debug (insn
, true);
2574 current_output_insn
= debug_insn
= 0;
2577 return NEXT_INSN (insn
);
2580 /* Return whether a source line note needs to be emitted before INSN. */
2583 notice_source_line (rtx insn
)
2585 const char *filename
= insn_file (insn
);
2586 int linenum
= insn_line (insn
);
2589 && (force_source_line
2590 || filename
!= last_filename
2591 || last_linenum
!= linenum
))
2593 force_source_line
= false;
2594 last_filename
= filename
;
2595 last_linenum
= linenum
;
2596 high_block_linenum
= MAX (last_linenum
, high_block_linenum
);
2597 high_function_linenum
= MAX (last_linenum
, high_function_linenum
);
2603 /* For each operand in INSN, simplify (subreg (reg)) so that it refers
2604 directly to the desired hard register. */
2607 cleanup_subreg_operands (rtx insn
)
2610 extract_insn_cached (insn
);
2611 for (i
= 0; i
< recog_data
.n_operands
; i
++)
2613 /* The following test cannot use recog_data.operand when testing
2614 for a SUBREG: the underlying object might have been changed
2615 already if we are inside a match_operator expression that
2616 matches the else clause. Instead we test the underlying
2617 expression directly. */
2618 if (GET_CODE (*recog_data
.operand_loc
[i
]) == SUBREG
)
2619 recog_data
.operand
[i
] = alter_subreg (recog_data
.operand_loc
[i
]);
2620 else if (GET_CODE (recog_data
.operand
[i
]) == PLUS
2621 || GET_CODE (recog_data
.operand
[i
]) == MULT
2622 || MEM_P (recog_data
.operand
[i
]))
2623 recog_data
.operand
[i
] = walk_alter_subreg (recog_data
.operand_loc
[i
]);
2626 for (i
= 0; i
< recog_data
.n_dups
; i
++)
2628 if (GET_CODE (*recog_data
.dup_loc
[i
]) == SUBREG
)
2629 *recog_data
.dup_loc
[i
] = alter_subreg (recog_data
.dup_loc
[i
]);
2630 else if (GET_CODE (*recog_data
.dup_loc
[i
]) == PLUS
2631 || GET_CODE (*recog_data
.dup_loc
[i
]) == MULT
2632 || MEM_P (*recog_data
.dup_loc
[i
]))
2633 *recog_data
.dup_loc
[i
] = walk_alter_subreg (recog_data
.dup_loc
[i
]);
2637 /* If X is a SUBREG, replace it with a REG or a MEM,
2638 based on the thing it is a subreg of. */
2641 alter_subreg (rtx
*xp
)
2644 rtx y
= SUBREG_REG (x
);
2646 /* simplify_subreg does not remove subreg from volatile references.
2647 We are required to. */
2650 int offset
= SUBREG_BYTE (x
);
2652 /* For paradoxical subregs on big-endian machines, SUBREG_BYTE
2653 contains 0 instead of the proper offset. See simplify_subreg. */
2655 && GET_MODE_SIZE (GET_MODE (y
)) < GET_MODE_SIZE (GET_MODE (x
)))
2657 int difference
= GET_MODE_SIZE (GET_MODE (y
))
2658 - GET_MODE_SIZE (GET_MODE (x
));
2659 if (WORDS_BIG_ENDIAN
)
2660 offset
+= (difference
/ UNITS_PER_WORD
) * UNITS_PER_WORD
;
2661 if (BYTES_BIG_ENDIAN
)
2662 offset
+= difference
% UNITS_PER_WORD
;
2665 *xp
= adjust_address (y
, GET_MODE (x
), offset
);
2669 rtx
new = simplify_subreg (GET_MODE (x
), y
, GET_MODE (y
),
2676 /* Simplify_subreg can't handle some REG cases, but we have to. */
2677 unsigned int regno
= subreg_regno (x
);
2678 *xp
= gen_rtx_REG_offset (y
, GET_MODE (x
), regno
, SUBREG_BYTE (x
));
2685 /* Do alter_subreg on all the SUBREGs contained in X. */
2688 walk_alter_subreg (rtx
*xp
)
2691 switch (GET_CODE (x
))
2696 XEXP (x
, 0) = walk_alter_subreg (&XEXP (x
, 0));
2697 XEXP (x
, 1) = walk_alter_subreg (&XEXP (x
, 1));
2702 XEXP (x
, 0) = walk_alter_subreg (&XEXP (x
, 0));
2706 return alter_subreg (xp
);
2717 /* Given BODY, the body of a jump instruction, alter the jump condition
2718 as required by the bits that are set in cc_status.flags.
2719 Not all of the bits there can be handled at this level in all cases.
2721 The value is normally 0.
2722 1 means that the condition has become always true.
2723 -1 means that the condition has become always false.
2724 2 means that COND has been altered. */
2727 alter_cond (rtx cond
)
2731 if (cc_status
.flags
& CC_REVERSED
)
2734 PUT_CODE (cond
, swap_condition (GET_CODE (cond
)));
2737 if (cc_status
.flags
& CC_INVERTED
)
2740 PUT_CODE (cond
, reverse_condition (GET_CODE (cond
)));
2743 if (cc_status
.flags
& CC_NOT_POSITIVE
)
2744 switch (GET_CODE (cond
))
2749 /* Jump becomes unconditional. */
2755 /* Jump becomes no-op. */
2759 PUT_CODE (cond
, EQ
);
2764 PUT_CODE (cond
, NE
);
2772 if (cc_status
.flags
& CC_NOT_NEGATIVE
)
2773 switch (GET_CODE (cond
))
2777 /* Jump becomes unconditional. */
2782 /* Jump becomes no-op. */
2787 PUT_CODE (cond
, EQ
);
2793 PUT_CODE (cond
, NE
);
2801 if (cc_status
.flags
& CC_NO_OVERFLOW
)
2802 switch (GET_CODE (cond
))
2805 /* Jump becomes unconditional. */
2809 PUT_CODE (cond
, EQ
);
2814 PUT_CODE (cond
, NE
);
2819 /* Jump becomes no-op. */
2826 if (cc_status
.flags
& (CC_Z_IN_NOT_N
| CC_Z_IN_N
))
2827 switch (GET_CODE (cond
))
2833 PUT_CODE (cond
, cc_status
.flags
& CC_Z_IN_N
? GE
: LT
);
2838 PUT_CODE (cond
, cc_status
.flags
& CC_Z_IN_N
? LT
: GE
);
2843 if (cc_status
.flags
& CC_NOT_SIGNED
)
2844 /* The flags are valid if signed condition operators are converted
2846 switch (GET_CODE (cond
))
2849 PUT_CODE (cond
, LEU
);
2854 PUT_CODE (cond
, LTU
);
2859 PUT_CODE (cond
, GTU
);
2864 PUT_CODE (cond
, GEU
);
2876 /* Report inconsistency between the assembler template and the operands.
2877 In an `asm', it's the user's fault; otherwise, the compiler's fault. */
2880 output_operand_lossage (const char *cmsgid
, ...)
2884 const char *pfx_str
;
2887 va_start (ap
, cmsgid
);
2889 pfx_str
= this_is_asm_operands
? _("invalid 'asm': ") : "output_operand: ";
2890 asprintf (&fmt_string
, "%s%s", pfx_str
, _(cmsgid
));
2891 vasprintf (&new_message
, fmt_string
, ap
);
2893 if (this_is_asm_operands
)
2894 error_for_asm (this_is_asm_operands
, "%s", new_message
);
2896 internal_error ("%s", new_message
);
2903 /* Output of assembler code from a template, and its subroutines. */
2905 /* Annotate the assembly with a comment describing the pattern and
2906 alternative used. */
2909 output_asm_name (void)
2913 int num
= INSN_CODE (debug_insn
);
2914 fprintf (asm_out_file
, "\t%s %d\t%s",
2915 ASM_COMMENT_START
, INSN_UID (debug_insn
),
2916 insn_data
[num
].name
);
2917 if (insn_data
[num
].n_alternatives
> 1)
2918 fprintf (asm_out_file
, "/%d", which_alternative
+ 1);
2919 #ifdef HAVE_ATTR_length
2920 fprintf (asm_out_file
, "\t[length = %d]",
2921 get_attr_length (debug_insn
));
2923 /* Clear this so only the first assembler insn
2924 of any rtl insn will get the special comment for -dp. */
2929 /* If OP is a REG or MEM and we can find a MEM_EXPR corresponding to it
2930 or its address, return that expr . Set *PADDRESSP to 1 if the expr
2931 corresponds to the address of the object and 0 if to the object. */
2934 get_mem_expr_from_op (rtx op
, int *paddressp
)
2942 return REG_EXPR (op
);
2943 else if (!MEM_P (op
))
2946 if (MEM_EXPR (op
) != 0)
2947 return MEM_EXPR (op
);
2949 /* Otherwise we have an address, so indicate it and look at the address. */
2953 /* First check if we have a decl for the address, then look at the right side
2954 if it is a PLUS. Otherwise, strip off arithmetic and keep looking.
2955 But don't allow the address to itself be indirect. */
2956 if ((expr
= get_mem_expr_from_op (op
, &inner_addressp
)) && ! inner_addressp
)
2958 else if (GET_CODE (op
) == PLUS
2959 && (expr
= get_mem_expr_from_op (XEXP (op
, 1), &inner_addressp
)))
2962 while (GET_RTX_CLASS (GET_CODE (op
)) == RTX_UNARY
2963 || GET_RTX_CLASS (GET_CODE (op
)) == RTX_BIN_ARITH
)
2966 expr
= get_mem_expr_from_op (op
, &inner_addressp
);
2967 return inner_addressp
? 0 : expr
;
2970 /* Output operand names for assembler instructions. OPERANDS is the
2971 operand vector, OPORDER is the order to write the operands, and NOPS
2972 is the number of operands to write. */
2975 output_asm_operand_names (rtx
*operands
, int *oporder
, int nops
)
2980 for (i
= 0; i
< nops
; i
++)
2983 rtx op
= operands
[oporder
[i
]];
2984 tree expr
= get_mem_expr_from_op (op
, &addressp
);
2986 fprintf (asm_out_file
, "%c%s",
2987 wrote
? ',' : '\t', wrote
? "" : ASM_COMMENT_START
);
2991 fprintf (asm_out_file
, "%s",
2992 addressp
? "*" : "");
2993 print_mem_expr (asm_out_file
, expr
);
2996 else if (REG_P (op
) && ORIGINAL_REGNO (op
)
2997 && ORIGINAL_REGNO (op
) != REGNO (op
))
2998 fprintf (asm_out_file
, " tmp%i", ORIGINAL_REGNO (op
));
3002 /* Output text from TEMPLATE to the assembler output file,
3003 obeying %-directions to substitute operands taken from
3004 the vector OPERANDS.
3006 %N (for N a digit) means print operand N in usual manner.
3007 %lN means require operand N to be a CODE_LABEL or LABEL_REF
3008 and print the label name with no punctuation.
3009 %cN means require operand N to be a constant
3010 and print the constant expression with no punctuation.
3011 %aN means expect operand N to be a memory address
3012 (not a memory reference!) and print a reference
3014 %nN means expect operand N to be a constant
3015 and print a constant expression for minus the value
3016 of the operand, with no other punctuation. */
3019 output_asm_insn (const char *template, rtx
*operands
)
3023 #ifdef ASSEMBLER_DIALECT
3026 int oporder
[MAX_RECOG_OPERANDS
];
3027 char opoutput
[MAX_RECOG_OPERANDS
];
3030 /* An insn may return a null string template
3031 in a case where no assembler code is needed. */
3035 memset (opoutput
, 0, sizeof opoutput
);
3037 putc ('\t', asm_out_file
);
3039 #ifdef ASM_OUTPUT_OPCODE
3040 ASM_OUTPUT_OPCODE (asm_out_file
, p
);
3047 if (flag_verbose_asm
)
3048 output_asm_operand_names (operands
, oporder
, ops
);
3049 if (flag_print_asm_name
)
3053 memset (opoutput
, 0, sizeof opoutput
);
3055 putc (c
, asm_out_file
);
3056 #ifdef ASM_OUTPUT_OPCODE
3057 while ((c
= *p
) == '\t')
3059 putc (c
, asm_out_file
);
3062 ASM_OUTPUT_OPCODE (asm_out_file
, p
);
3066 #ifdef ASSEMBLER_DIALECT
3072 output_operand_lossage ("nested assembly dialect alternatives");
3076 /* If we want the first dialect, do nothing. Otherwise, skip
3077 DIALECT_NUMBER of strings ending with '|'. */
3078 for (i
= 0; i
< dialect_number
; i
++)
3080 while (*p
&& *p
!= '}' && *p
++ != '|')
3089 output_operand_lossage ("unterminated assembly dialect alternative");
3096 /* Skip to close brace. */
3101 output_operand_lossage ("unterminated assembly dialect alternative");
3105 while (*p
++ != '}');
3109 putc (c
, asm_out_file
);
3114 putc (c
, asm_out_file
);
3120 /* %% outputs a single %. */
3124 putc (c
, asm_out_file
);
3126 /* %= outputs a number which is unique to each insn in the entire
3127 compilation. This is useful for making local labels that are
3128 referred to more than once in a given insn. */
3132 fprintf (asm_out_file
, "%d", insn_counter
);
3134 /* % followed by a letter and some digits
3135 outputs an operand in a special way depending on the letter.
3136 Letters `acln' are implemented directly.
3137 Other letters are passed to `output_operand' so that
3138 the PRINT_OPERAND macro can define them. */
3139 else if (ISALPHA (*p
))
3142 unsigned long opnum
;
3145 opnum
= strtoul (p
, &endptr
, 10);
3148 output_operand_lossage ("operand number missing "
3150 else if (this_is_asm_operands
&& opnum
>= insn_noperands
)
3151 output_operand_lossage ("operand number out of range");
3152 else if (letter
== 'l')
3153 output_asm_label (operands
[opnum
]);
3154 else if (letter
== 'a')
3155 output_address (operands
[opnum
]);
3156 else if (letter
== 'c')
3158 if (CONSTANT_ADDRESS_P (operands
[opnum
]))
3159 output_addr_const (asm_out_file
, operands
[opnum
]);
3161 output_operand (operands
[opnum
], 'c');
3163 else if (letter
== 'n')
3165 if (GET_CODE (operands
[opnum
]) == CONST_INT
)
3166 fprintf (asm_out_file
, HOST_WIDE_INT_PRINT_DEC
,
3167 - INTVAL (operands
[opnum
]));
3170 putc ('-', asm_out_file
);
3171 output_addr_const (asm_out_file
, operands
[opnum
]);
3175 output_operand (operands
[opnum
], letter
);
3177 if (!opoutput
[opnum
])
3178 oporder
[ops
++] = opnum
;
3179 opoutput
[opnum
] = 1;
3184 /* % followed by a digit outputs an operand the default way. */
3185 else if (ISDIGIT (*p
))
3187 unsigned long opnum
;
3190 opnum
= strtoul (p
, &endptr
, 10);
3191 if (this_is_asm_operands
&& opnum
>= insn_noperands
)
3192 output_operand_lossage ("operand number out of range");
3194 output_operand (operands
[opnum
], 0);
3196 if (!opoutput
[opnum
])
3197 oporder
[ops
++] = opnum
;
3198 opoutput
[opnum
] = 1;
3203 /* % followed by punctuation: output something for that
3204 punctuation character alone, with no operand.
3205 The PRINT_OPERAND macro decides what is actually done. */
3206 #ifdef PRINT_OPERAND_PUNCT_VALID_P
3207 else if (PRINT_OPERAND_PUNCT_VALID_P ((unsigned char) *p
))
3208 output_operand (NULL_RTX
, *p
++);
3211 output_operand_lossage ("invalid %%-code");
3215 putc (c
, asm_out_file
);
3218 /* Write out the variable names for operands, if we know them. */
3219 if (flag_verbose_asm
)
3220 output_asm_operand_names (operands
, oporder
, ops
);
3221 if (flag_print_asm_name
)
3224 putc ('\n', asm_out_file
);
3227 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
3230 output_asm_label (rtx x
)
3234 if (GET_CODE (x
) == LABEL_REF
)
3238 && NOTE_LINE_NUMBER (x
) == NOTE_INSN_DELETED_LABEL
))
3239 ASM_GENERATE_INTERNAL_LABEL (buf
, "L", CODE_LABEL_NUMBER (x
));
3241 output_operand_lossage ("'%%l' operand isn't a label");
3243 assemble_name (asm_out_file
, buf
);
3246 /* Print operand X using machine-dependent assembler syntax.
3247 The macro PRINT_OPERAND is defined just to control this function.
3248 CODE is a non-digit that preceded the operand-number in the % spec,
3249 such as 'z' if the spec was `%z3'. CODE is 0 if there was no char
3250 between the % and the digits.
3251 When CODE is a non-letter, X is 0.
3253 The meanings of the letters are machine-dependent and controlled
3254 by PRINT_OPERAND. */
3257 output_operand (rtx x
, int code ATTRIBUTE_UNUSED
)
3259 if (x
&& GET_CODE (x
) == SUBREG
)
3260 x
= alter_subreg (&x
);
3262 /* X must not be a pseudo reg. */
3263 gcc_assert (!x
|| !REG_P (x
) || REGNO (x
) < FIRST_PSEUDO_REGISTER
);
3265 PRINT_OPERAND (asm_out_file
, x
, code
);
3268 /* Print a memory reference operand for address X
3269 using machine-dependent assembler syntax.
3270 The macro PRINT_OPERAND_ADDRESS exists just to control this function. */
3273 output_address (rtx x
)
3275 walk_alter_subreg (&x
);
3276 PRINT_OPERAND_ADDRESS (asm_out_file
, x
);
3279 /* Print an integer constant expression in assembler syntax.
3280 Addition and subtraction are the only arithmetic
3281 that may appear in these expressions. */
3284 output_addr_const (FILE *file
, rtx x
)
3289 switch (GET_CODE (x
))
3296 if (SYMBOL_REF_DECL (x
))
3297 mark_decl_referenced (SYMBOL_REF_DECL (x
));
3298 #ifdef ASM_OUTPUT_SYMBOL_REF
3299 ASM_OUTPUT_SYMBOL_REF (file
, x
);
3301 assemble_name (file
, XSTR (x
, 0));
3309 ASM_GENERATE_INTERNAL_LABEL (buf
, "L", CODE_LABEL_NUMBER (x
));
3310 #ifdef ASM_OUTPUT_LABEL_REF
3311 ASM_OUTPUT_LABEL_REF (file
, buf
);
3313 assemble_name (file
, buf
);
3318 fprintf (file
, HOST_WIDE_INT_PRINT_DEC
, INTVAL (x
));
3322 /* This used to output parentheses around the expression,
3323 but that does not work on the 386 (either ATT or BSD assembler). */
3324 output_addr_const (file
, XEXP (x
, 0));
3328 if (GET_MODE (x
) == VOIDmode
)
3330 /* We can use %d if the number is one word and positive. */
3331 if (CONST_DOUBLE_HIGH (x
))
3332 fprintf (file
, HOST_WIDE_INT_PRINT_DOUBLE_HEX
,
3333 CONST_DOUBLE_HIGH (x
), CONST_DOUBLE_LOW (x
));
3334 else if (CONST_DOUBLE_LOW (x
) < 0)
3335 fprintf (file
, HOST_WIDE_INT_PRINT_HEX
, CONST_DOUBLE_LOW (x
));
3337 fprintf (file
, HOST_WIDE_INT_PRINT_DEC
, CONST_DOUBLE_LOW (x
));
3340 /* We can't handle floating point constants;
3341 PRINT_OPERAND must handle them. */
3342 output_operand_lossage ("floating constant misused");
3346 /* Some assemblers need integer constants to appear last (eg masm). */
3347 if (GET_CODE (XEXP (x
, 0)) == CONST_INT
)
3349 output_addr_const (file
, XEXP (x
, 1));
3350 if (INTVAL (XEXP (x
, 0)) >= 0)
3351 fprintf (file
, "+");
3352 output_addr_const (file
, XEXP (x
, 0));
3356 output_addr_const (file
, XEXP (x
, 0));
3357 if (GET_CODE (XEXP (x
, 1)) != CONST_INT
3358 || INTVAL (XEXP (x
, 1)) >= 0)
3359 fprintf (file
, "+");
3360 output_addr_const (file
, XEXP (x
, 1));
3365 /* Avoid outputting things like x-x or x+5-x,
3366 since some assemblers can't handle that. */
3367 x
= simplify_subtraction (x
);
3368 if (GET_CODE (x
) != MINUS
)
3371 output_addr_const (file
, XEXP (x
, 0));
3372 fprintf (file
, "-");
3373 if ((GET_CODE (XEXP (x
, 1)) == CONST_INT
&& INTVAL (XEXP (x
, 1)) >= 0)
3374 || GET_CODE (XEXP (x
, 1)) == PC
3375 || GET_CODE (XEXP (x
, 1)) == SYMBOL_REF
)
3376 output_addr_const (file
, XEXP (x
, 1));
3379 fputs (targetm
.asm_out
.open_paren
, file
);
3380 output_addr_const (file
, XEXP (x
, 1));
3381 fputs (targetm
.asm_out
.close_paren
, file
);
3388 output_addr_const (file
, XEXP (x
, 0));
3392 #ifdef OUTPUT_ADDR_CONST_EXTRA
3393 OUTPUT_ADDR_CONST_EXTRA (file
, x
, fail
);
3398 output_operand_lossage ("invalid expression as operand");
3402 /* A poor man's fprintf, with the added features of %I, %R, %L, and %U.
3403 %R prints the value of REGISTER_PREFIX.
3404 %L prints the value of LOCAL_LABEL_PREFIX.
3405 %U prints the value of USER_LABEL_PREFIX.
3406 %I prints the value of IMMEDIATE_PREFIX.
3407 %O runs ASM_OUTPUT_OPCODE to transform what follows in the string.
3408 Also supported are %d, %i, %u, %x, %X, %o, %c, %s and %%.
3410 We handle alternate assembler dialects here, just like output_asm_insn. */
3413 asm_fprintf (FILE *file
, const char *p
, ...)
3419 va_start (argptr
, p
);
3426 #ifdef ASSEMBLER_DIALECT
3431 /* If we want the first dialect, do nothing. Otherwise, skip
3432 DIALECT_NUMBER of strings ending with '|'. */
3433 for (i
= 0; i
< dialect_number
; i
++)
3435 while (*p
&& *p
++ != '|')
3445 /* Skip to close brace. */
3446 while (*p
&& *p
++ != '}')
3457 while (strchr ("-+ #0", c
))
3462 while (ISDIGIT (c
) || c
== '.')
3473 case 'd': case 'i': case 'u':
3474 case 'x': case 'X': case 'o':
3478 fprintf (file
, buf
, va_arg (argptr
, int));
3482 /* This is a prefix to the 'd', 'i', 'u', 'x', 'X', and
3483 'o' cases, but we do not check for those cases. It
3484 means that the value is a HOST_WIDE_INT, which may be
3485 either `long' or `long long'. */
3486 memcpy (q
, HOST_WIDE_INT_PRINT
, strlen (HOST_WIDE_INT_PRINT
));
3487 q
+= strlen (HOST_WIDE_INT_PRINT
);
3490 fprintf (file
, buf
, va_arg (argptr
, HOST_WIDE_INT
));
3495 #ifdef HAVE_LONG_LONG
3501 fprintf (file
, buf
, va_arg (argptr
, long long));
3508 fprintf (file
, buf
, va_arg (argptr
, long));
3516 fprintf (file
, buf
, va_arg (argptr
, char *));
3520 #ifdef ASM_OUTPUT_OPCODE
3521 ASM_OUTPUT_OPCODE (asm_out_file
, p
);
3526 #ifdef REGISTER_PREFIX
3527 fprintf (file
, "%s", REGISTER_PREFIX
);
3532 #ifdef IMMEDIATE_PREFIX
3533 fprintf (file
, "%s", IMMEDIATE_PREFIX
);
3538 #ifdef LOCAL_LABEL_PREFIX
3539 fprintf (file
, "%s", LOCAL_LABEL_PREFIX
);
3544 fputs (user_label_prefix
, file
);
3547 #ifdef ASM_FPRINTF_EXTENSIONS
3548 /* Uppercase letters are reserved for general use by asm_fprintf
3549 and so are not available to target specific code. In order to
3550 prevent the ASM_FPRINTF_EXTENSIONS macro from using them then,
3551 they are defined here. As they get turned into real extensions
3552 to asm_fprintf they should be removed from this list. */
3553 case 'A': case 'B': case 'C': case 'D': case 'E':
3554 case 'F': case 'G': case 'H': case 'J': case 'K':
3555 case 'M': case 'N': case 'P': case 'Q': case 'S':
3556 case 'T': case 'V': case 'W': case 'Y': case 'Z':
3559 ASM_FPRINTF_EXTENSIONS (file
, argptr
, p
)
3572 /* Split up a CONST_DOUBLE or integer constant rtx
3573 into two rtx's for single words,
3574 storing in *FIRST the word that comes first in memory in the target
3575 and in *SECOND the other. */
3578 split_double (rtx value
, rtx
*first
, rtx
*second
)
3580 if (GET_CODE (value
) == CONST_INT
)
3582 if (HOST_BITS_PER_WIDE_INT
>= (2 * BITS_PER_WORD
))
3584 /* In this case the CONST_INT holds both target words.
3585 Extract the bits from it into two word-sized pieces.
3586 Sign extend each half to HOST_WIDE_INT. */
3587 unsigned HOST_WIDE_INT low
, high
;
3588 unsigned HOST_WIDE_INT mask
, sign_bit
, sign_extend
;
3590 /* Set sign_bit to the most significant bit of a word. */
3592 sign_bit
<<= BITS_PER_WORD
- 1;
3594 /* Set mask so that all bits of the word are set. We could
3595 have used 1 << BITS_PER_WORD instead of basing the
3596 calculation on sign_bit. However, on machines where
3597 HOST_BITS_PER_WIDE_INT == BITS_PER_WORD, it could cause a
3598 compiler warning, even though the code would never be
3600 mask
= sign_bit
<< 1;
3603 /* Set sign_extend as any remaining bits. */
3604 sign_extend
= ~mask
;
3606 /* Pick the lower word and sign-extend it. */
3607 low
= INTVAL (value
);
3612 /* Pick the higher word, shifted to the least significant
3613 bits, and sign-extend it. */
3614 high
= INTVAL (value
);
3615 high
>>= BITS_PER_WORD
- 1;
3618 if (high
& sign_bit
)
3619 high
|= sign_extend
;
3621 /* Store the words in the target machine order. */
3622 if (WORDS_BIG_ENDIAN
)
3624 *first
= GEN_INT (high
);
3625 *second
= GEN_INT (low
);
3629 *first
= GEN_INT (low
);
3630 *second
= GEN_INT (high
);
3635 /* The rule for using CONST_INT for a wider mode
3636 is that we regard the value as signed.
3637 So sign-extend it. */
3638 rtx high
= (INTVAL (value
) < 0 ? constm1_rtx
: const0_rtx
);
3639 if (WORDS_BIG_ENDIAN
)
3651 else if (GET_CODE (value
) != CONST_DOUBLE
)
3653 if (WORDS_BIG_ENDIAN
)
3655 *first
= const0_rtx
;
3661 *second
= const0_rtx
;
3664 else if (GET_MODE (value
) == VOIDmode
3665 /* This is the old way we did CONST_DOUBLE integers. */
3666 || GET_MODE_CLASS (GET_MODE (value
)) == MODE_INT
)
3668 /* In an integer, the words are defined as most and least significant.
3669 So order them by the target's convention. */
3670 if (WORDS_BIG_ENDIAN
)
3672 *first
= GEN_INT (CONST_DOUBLE_HIGH (value
));
3673 *second
= GEN_INT (CONST_DOUBLE_LOW (value
));
3677 *first
= GEN_INT (CONST_DOUBLE_LOW (value
));
3678 *second
= GEN_INT (CONST_DOUBLE_HIGH (value
));
3685 REAL_VALUE_FROM_CONST_DOUBLE (r
, value
);
3687 /* Note, this converts the REAL_VALUE_TYPE to the target's
3688 format, splits up the floating point double and outputs
3689 exactly 32 bits of it into each of l[0] and l[1] --
3690 not necessarily BITS_PER_WORD bits. */
3691 REAL_VALUE_TO_TARGET_DOUBLE (r
, l
);
3693 /* If 32 bits is an entire word for the target, but not for the host,
3694 then sign-extend on the host so that the number will look the same
3695 way on the host that it would on the target. See for instance
3696 simplify_unary_operation. The #if is needed to avoid compiler
3699 #if HOST_BITS_PER_LONG > 32
3700 if (BITS_PER_WORD
< HOST_BITS_PER_LONG
&& BITS_PER_WORD
== 32)
3702 if (l
[0] & ((long) 1 << 31))
3703 l
[0] |= ((long) (-1) << 32);
3704 if (l
[1] & ((long) 1 << 31))
3705 l
[1] |= ((long) (-1) << 32);
3709 *first
= GEN_INT (l
[0]);
3710 *second
= GEN_INT (l
[1]);
3714 /* Return nonzero if this function has no function calls. */
3717 leaf_function_p (void)
3722 if (current_function_profile
|| profile_arc_flag
)
3725 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3728 && ! SIBLING_CALL_P (insn
))
3730 if (NONJUMP_INSN_P (insn
)
3731 && GET_CODE (PATTERN (insn
)) == SEQUENCE
3732 && CALL_P (XVECEXP (PATTERN (insn
), 0, 0))
3733 && ! SIBLING_CALL_P (XVECEXP (PATTERN (insn
), 0, 0)))
3736 for (link
= current_function_epilogue_delay_list
;
3738 link
= XEXP (link
, 1))
3740 insn
= XEXP (link
, 0);
3743 && ! SIBLING_CALL_P (insn
))
3745 if (NONJUMP_INSN_P (insn
)
3746 && GET_CODE (PATTERN (insn
)) == SEQUENCE
3747 && CALL_P (XVECEXP (PATTERN (insn
), 0, 0))
3748 && ! SIBLING_CALL_P (XVECEXP (PATTERN (insn
), 0, 0)))
3755 /* Return 1 if branch is a forward branch.
3756 Uses insn_shuid array, so it works only in the final pass. May be used by
3757 output templates to customary add branch prediction hints.
3760 final_forward_branch_p (rtx insn
)
3762 int insn_id
, label_id
;
3764 gcc_assert (uid_shuid
);
3765 insn_id
= INSN_SHUID (insn
);
3766 label_id
= INSN_SHUID (JUMP_LABEL (insn
));
3767 /* We've hit some insns that does not have id information available. */
3768 gcc_assert (insn_id
&& label_id
);
3769 return insn_id
< label_id
;
3772 /* On some machines, a function with no call insns
3773 can run faster if it doesn't create its own register window.
3774 When output, the leaf function should use only the "output"
3775 registers. Ordinarily, the function would be compiled to use
3776 the "input" registers to find its arguments; it is a candidate
3777 for leaf treatment if it uses only the "input" registers.
3778 Leaf function treatment means renumbering so the function
3779 uses the "output" registers instead. */
3781 #ifdef LEAF_REGISTERS
3783 /* Return 1 if this function uses only the registers that can be
3784 safely renumbered. */
3787 only_leaf_regs_used (void)
3790 const char *const permitted_reg_in_leaf_functions
= LEAF_REGISTERS
;
3792 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
3793 if ((regs_ever_live
[i
] || global_regs
[i
])
3794 && ! permitted_reg_in_leaf_functions
[i
])
3797 if (current_function_uses_pic_offset_table
3798 && pic_offset_table_rtx
!= 0
3799 && REG_P (pic_offset_table_rtx
)
3800 && ! permitted_reg_in_leaf_functions
[REGNO (pic_offset_table_rtx
)])
3806 /* Scan all instructions and renumber all registers into those
3807 available in leaf functions. */
3810 leaf_renumber_regs (rtx first
)
3814 /* Renumber only the actual patterns.
3815 The reg-notes can contain frame pointer refs,
3816 and renumbering them could crash, and should not be needed. */
3817 for (insn
= first
; insn
; insn
= NEXT_INSN (insn
))
3819 leaf_renumber_regs_insn (PATTERN (insn
));
3820 for (insn
= current_function_epilogue_delay_list
;
3822 insn
= XEXP (insn
, 1))
3823 if (INSN_P (XEXP (insn
, 0)))
3824 leaf_renumber_regs_insn (PATTERN (XEXP (insn
, 0)));
3827 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
3828 available in leaf functions. */
3831 leaf_renumber_regs_insn (rtx in_rtx
)
3834 const char *format_ptr
;
3839 /* Renumber all input-registers into output-registers.
3840 renumbered_regs would be 1 for an output-register;
3847 /* Don't renumber the same reg twice. */
3851 newreg
= REGNO (in_rtx
);
3852 /* Don't try to renumber pseudo regs. It is possible for a pseudo reg
3853 to reach here as part of a REG_NOTE. */
3854 if (newreg
>= FIRST_PSEUDO_REGISTER
)
3859 newreg
= LEAF_REG_REMAP (newreg
);
3860 gcc_assert (newreg
>= 0);
3861 regs_ever_live
[REGNO (in_rtx
)] = 0;
3862 regs_ever_live
[newreg
] = 1;
3863 REGNO (in_rtx
) = newreg
;
3867 if (INSN_P (in_rtx
))
3869 /* Inside a SEQUENCE, we find insns.
3870 Renumber just the patterns of these insns,
3871 just as we do for the top-level insns. */
3872 leaf_renumber_regs_insn (PATTERN (in_rtx
));
3876 format_ptr
= GET_RTX_FORMAT (GET_CODE (in_rtx
));
3878 for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (in_rtx
)); i
++)
3879 switch (*format_ptr
++)
3882 leaf_renumber_regs_insn (XEXP (in_rtx
, i
));
3886 if (NULL
!= XVEC (in_rtx
, i
))
3888 for (j
= 0; j
< XVECLEN (in_rtx
, i
); j
++)
3889 leaf_renumber_regs_insn (XVECEXP (in_rtx
, i
, j
));
3909 /* When -gused is used, emit debug info for only used symbols. But in
3910 addition to the standard intercepted debug_hooks there are some direct
3911 calls into this file, i.e., dbxout_symbol, dbxout_parms, and dbxout_reg_params.
3912 Those routines may also be called from a higher level intercepted routine. So
3913 to prevent recording data for an inner call to one of these for an intercept,
3914 we maintain an intercept nesting counter (debug_nesting). We only save the
3915 intercepted arguments if the nesting is 1. */
3916 int debug_nesting
= 0;
3918 static tree
*symbol_queue
;
3919 int symbol_queue_index
= 0;
3920 static int symbol_queue_size
= 0;
3922 /* Generate the symbols for any queued up type symbols we encountered
3923 while generating the type info for some originally used symbol.
3924 This might generate additional entries in the queue. Only when
3925 the nesting depth goes to 0 is this routine called. */
3928 debug_flush_symbol_queue (void)
3932 /* Make sure that additionally queued items are not flushed
3937 for (i
= 0; i
< symbol_queue_index
; ++i
)
3939 /* If we pushed queued symbols then such symbols must be
3940 output no matter what anyone else says. Specifically,
3941 we need to make sure dbxout_symbol() thinks the symbol was
3942 used and also we need to override TYPE_DECL_SUPPRESS_DEBUG
3943 which may be set for outside reasons. */
3944 int saved_tree_used
= TREE_USED (symbol_queue
[i
]);
3945 int saved_suppress_debug
= TYPE_DECL_SUPPRESS_DEBUG (symbol_queue
[i
]);
3946 TREE_USED (symbol_queue
[i
]) = 1;
3947 TYPE_DECL_SUPPRESS_DEBUG (symbol_queue
[i
]) = 0;
3949 #ifdef DBX_DEBUGGING_INFO
3950 dbxout_symbol (symbol_queue
[i
], 0);
3953 TREE_USED (symbol_queue
[i
]) = saved_tree_used
;
3954 TYPE_DECL_SUPPRESS_DEBUG (symbol_queue
[i
]) = saved_suppress_debug
;
3957 symbol_queue_index
= 0;
3961 /* Queue a type symbol needed as part of the definition of a decl
3962 symbol. These symbols are generated when debug_flush_symbol_queue()
3966 debug_queue_symbol (tree decl
)
3968 if (symbol_queue_index
>= symbol_queue_size
)
3970 symbol_queue_size
+= 10;
3971 symbol_queue
= xrealloc (symbol_queue
,
3972 symbol_queue_size
* sizeof (tree
));
3975 symbol_queue
[symbol_queue_index
++] = decl
;
3978 /* Free symbol queue. */
3980 debug_free_queue (void)
3984 free (symbol_queue
);
3985 symbol_queue
= NULL
;
3986 symbol_queue_size
= 0;
3990 /* Turn the RTL into assembly. */
3992 rest_of_handle_final (void)
3997 /* Get the function's name, as described by its RTL. This may be
3998 different from the DECL_NAME name used in the source file. */
4000 x
= DECL_RTL (current_function_decl
);
4001 gcc_assert (MEM_P (x
));
4003 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
4004 fnname
= XSTR (x
, 0);
4006 assemble_start_function (current_function_decl
, fnname
);
4007 final_start_function (get_insns (), asm_out_file
, optimize
);
4008 final (get_insns (), asm_out_file
, optimize
);
4009 final_end_function ();
4011 #ifdef TARGET_UNWIND_INFO
4012 /* ??? The IA-64 ".handlerdata" directive must be issued before
4013 the ".endp" directive that closes the procedure descriptor. */
4014 output_function_exception_table (fnname
);
4017 assemble_end_function (current_function_decl
, fnname
);
4019 #ifndef TARGET_UNWIND_INFO
4020 /* Otherwise, it feels unclean to switch sections in the middle. */
4021 output_function_exception_table (fnname
);
4024 user_defined_section_attribute
= false;
4027 fflush (asm_out_file
);
4029 /* Release all memory allocated by flow. */
4030 free_basic_block_vars ();
4032 /* Write DBX symbols if requested. */
4034 /* Note that for those inline functions where we don't initially
4035 know for certain that we will be generating an out-of-line copy,
4036 the first invocation of this routine (rest_of_compilation) will
4037 skip over this code by doing a `goto exit_rest_of_compilation;'.
4038 Later on, wrapup_global_declarations will (indirectly) call
4039 rest_of_compilation again for those inline functions that need
4040 to have out-of-line copies generated. During that call, we
4041 *will* be routed past here. */
4043 timevar_push (TV_SYMOUT
);
4044 (*debug_hooks
->function_decl
) (current_function_decl
);
4045 timevar_pop (TV_SYMOUT
);
4049 struct tree_opt_pass pass_final
=
4053 rest_of_handle_final
, /* execute */
4056 0, /* static_pass_number */
4057 TV_FINAL
, /* tv_id */
4058 0, /* properties_required */
4059 0, /* properties_provided */
4060 0, /* properties_destroyed */
4061 0, /* todo_flags_start */
4062 TODO_ggc_collect
, /* todo_flags_finish */
4068 rest_of_handle_shorten_branches (void)
4070 /* Shorten branches. */
4071 shorten_branches (get_insns ());
4075 struct tree_opt_pass pass_shorten_branches
=
4077 "shorten", /* name */
4079 rest_of_handle_shorten_branches
, /* execute */
4082 0, /* static_pass_number */
4083 TV_FINAL
, /* tv_id */
4084 0, /* properties_required */
4085 0, /* properties_provided */
4086 0, /* properties_destroyed */
4087 0, /* todo_flags_start */
4088 TODO_dump_func
, /* todo_flags_finish */
4094 rest_of_clean_state (void)
4098 /* It is very important to decompose the RTL instruction chain here:
4099 debug information keeps pointing into CODE_LABEL insns inside the function
4100 body. If these remain pointing to the other insns, we end up preserving
4101 whole RTL chain and attached detailed debug info in memory. */
4102 for (insn
= get_insns (); insn
; insn
= next
)
4104 next
= NEXT_INSN (insn
);
4105 NEXT_INSN (insn
) = NULL
;
4106 PREV_INSN (insn
) = NULL
;
4109 /* In case the function was not output,
4110 don't leave any temporary anonymous types
4111 queued up for sdb output. */
4112 #ifdef SDB_DEBUGGING_INFO
4113 if (write_symbols
== SDB_DEBUG
)
4114 sdbout_types (NULL_TREE
);
4117 reload_completed
= 0;
4118 epilogue_completed
= 0;
4119 flow2_completed
= 0;
4122 regstack_completed
= 0;
4125 /* Clear out the insn_length contents now that they are no
4127 init_insn_lengths ();
4129 /* Show no temporary slots allocated. */
4132 free_basic_block_vars ();
4133 free_bb_for_insn ();
4136 if (targetm
.binds_local_p (current_function_decl
))
4138 int pref
= cfun
->preferred_stack_boundary
;
4139 if (cfun
->stack_alignment_needed
> cfun
->preferred_stack_boundary
)
4140 pref
= cfun
->stack_alignment_needed
;
4141 cgraph_rtl_info (current_function_decl
)->preferred_incoming_stack_boundary
4145 /* Make sure volatile mem refs aren't considered valid operands for
4146 arithmetic insns. We must call this here if this is a nested inline
4147 function, since the above code leaves us in the init_recog state,
4148 and the function context push/pop code does not save/restore volatile_ok.
4150 ??? Maybe it isn't necessary for expand_start_function to call this
4151 anymore if we do it here? */
4153 init_recog_no_volatile ();
4155 /* We're done with this function. Free up memory if we can. */
4156 free_after_parsing (cfun
);
4157 free_after_compilation (cfun
);
4161 struct tree_opt_pass pass_clean_state
=
4165 rest_of_clean_state
, /* execute */
4168 0, /* static_pass_number */
4169 TV_FINAL
, /* tv_id */
4170 0, /* properties_required */
4171 0, /* properties_provided */
4172 PROP_rtl
, /* properties_destroyed */
4173 0, /* todo_flags_start */
4174 0, /* todo_flags_finish */