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 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
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 as assembler code by the macros FUNCTION_PROLOGUE and
46 FUNCTION_EPILOGUE. Those instructions never exist as rtl. */
55 #include "insn-config.h"
56 #include "insn-flags.h"
57 #include "insn-attr.h"
58 #include "insn-codes.h"
60 #include "conditions.h"
63 #include "hard-reg-set.h"
71 #include "basic-block.h"
73 /* Get N_SLINE and N_SOL from stab.h if we can expect the file to exist. */
74 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
76 #if defined (USG) || !defined (HAVE_STAB_H)
77 #include "gstab.h" /* If doing DBX on sysV, use our own stab.h. */
82 #endif /* DBX_DEBUGGING_INFO || XCOFF_DEBUGGING_INFO */
84 #ifndef ACCUMULATE_OUTGOING_ARGS
85 #define ACCUMULATE_OUTGOING_ARGS 0
88 #ifdef XCOFF_DEBUGGING_INFO
92 #ifdef DWARF_DEBUGGING_INFO
96 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
97 #include "dwarf2out.h"
100 #ifdef SDB_DEBUGGING_INFO
104 /* .stabd code for line number. */
109 /* .stabs code for included file name. */
114 #ifndef INT_TYPE_SIZE
115 #define INT_TYPE_SIZE BITS_PER_WORD
118 #ifndef LONG_TYPE_SIZE
119 #define LONG_TYPE_SIZE BITS_PER_WORD
122 /* If we aren't using cc0, CC_STATUS_INIT shouldn't exist. So define a
123 null default for it to save conditionalization later. */
124 #ifndef CC_STATUS_INIT
125 #define CC_STATUS_INIT
128 /* How to start an assembler comment. */
129 #ifndef ASM_COMMENT_START
130 #define ASM_COMMENT_START ";#"
133 /* Is the given character a logical line separator for the assembler? */
134 #ifndef IS_ASM_LOGICAL_LINE_SEPARATOR
135 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C) ((C) == ';')
138 #ifndef JUMP_TABLES_IN_TEXT_SECTION
139 #define JUMP_TABLES_IN_TEXT_SECTION 0
142 /* Last insn processed by final_scan_insn. */
143 static rtx debug_insn
;
144 rtx current_output_insn
;
146 /* Line number of last NOTE. */
147 static int last_linenum
;
149 /* Highest line number in current block. */
150 static int high_block_linenum
;
152 /* Likewise for function. */
153 static int high_function_linenum
;
155 /* Filename of last NOTE. */
156 static const char *last_filename
;
158 /* Number of basic blocks seen so far;
159 used if profile_block_flag is set. */
160 static int count_basic_blocks
;
162 /* Number of instrumented arcs when profile_arc_flag is set. */
163 extern int count_instrumented_edges
;
165 extern int length_unit_log
; /* This is defined in insn-attrtab.c. */
167 /* Nonzero while outputting an `asm' with operands.
168 This means that inconsistencies are the user's fault, so don't abort.
169 The precise value is the insn being output, to pass to error_for_asm. */
170 static rtx this_is_asm_operands
;
172 /* Number of operands of this insn, for an `asm' with operands. */
173 static unsigned int insn_noperands
;
175 /* Compare optimization flag. */
177 static rtx last_ignored_compare
= 0;
179 /* Flag indicating this insn is the start of a new basic block. */
181 static int new_block
= 1;
183 /* Assign a unique number to each insn that is output.
184 This can be used to generate unique local labels. */
186 static int insn_counter
= 0;
189 /* This variable contains machine-dependent flags (defined in tm.h)
190 set and examined by output routines
191 that describe how to interpret the condition codes properly. */
195 /* During output of an insn, this contains a copy of cc_status
196 from before the insn. */
198 CC_STATUS cc_prev_status
;
201 /* Indexed by hardware reg number, is 1 if that register is ever
202 used in the current function.
204 In life_analysis, or in stupid_life_analysis, this is set
205 up to record the hard regs used explicitly. Reload adds
206 in the hard regs used for holding pseudo regs. Final uses
207 it to generate the code in the function prologue and epilogue
208 to save and restore registers as needed. */
210 char regs_ever_live
[FIRST_PSEUDO_REGISTER
];
212 /* Nonzero means current function must be given a frame pointer.
213 Set in stmt.c if anything is allocated on the stack there.
214 Set in reload1.c if anything is allocated on the stack there. */
216 int frame_pointer_needed
;
218 /* Assign unique numbers to labels generated for profiling. */
220 int profile_label_no
;
222 /* Number of unmatched NOTE_INSN_BLOCK_BEG notes we have seen. */
224 static int block_depth
;
226 /* Nonzero if have enabled APP processing of our assembler output. */
230 /* If we are outputting an insn sequence, this contains the sequence rtx.
235 #ifdef ASSEMBLER_DIALECT
237 /* Number of the assembler dialect to use, starting at 0. */
238 static int dialect_number
;
241 /* Indexed by line number, nonzero if there is a note for that line. */
243 static char *line_note_exists
;
245 #ifdef HAVE_conditional_execution
246 /* Nonnull if the insn currently being emitted was a COND_EXEC pattern. */
247 rtx current_insn_predicate
;
250 /* Linked list to hold line numbers for each basic block. */
253 struct bb_list
*next
; /* pointer to next basic block */
254 int line_num
; /* line number */
255 int file_label_num
; /* LPBC<n> label # for stored filename */
256 int func_label_num
; /* LPBC<n> label # for stored function name */
259 static struct bb_list
*bb_head
= 0; /* Head of basic block list */
260 static struct bb_list
**bb_tail
= &bb_head
; /* Ptr to store next bb ptr */
261 static int bb_file_label_num
= -1; /* Current label # for file */
262 static int bb_func_label_num
= -1; /* Current label # for func */
264 /* Linked list to hold the strings for each file and function name output. */
267 struct bb_str
*next
; /* pointer to next string */
268 const char *string
; /* string */
269 int label_num
; /* label number */
270 int length
; /* string length */
273 static struct bb_str
*sbb_head
= 0; /* Head of string list. */
274 static struct bb_str
**sbb_tail
= &sbb_head
; /* Ptr to store next bb str */
275 static int sbb_label_num
= 0; /* Last label used */
277 #ifdef HAVE_ATTR_length
278 static int asm_insn_count
PARAMS ((rtx
));
280 static void profile_function
PARAMS ((FILE *));
281 static void profile_after_prologue
PARAMS ((FILE *));
282 static void add_bb
PARAMS ((FILE *));
283 static int add_bb_string
PARAMS ((const char *, int));
284 static void output_source_line
PARAMS ((FILE *, rtx
));
285 static rtx walk_alter_subreg
PARAMS ((rtx
));
286 static void output_asm_name
PARAMS ((void));
287 static void output_operand
PARAMS ((rtx
, int));
288 #ifdef LEAF_REGISTERS
289 static void leaf_renumber_regs
PARAMS ((rtx
));
292 static int alter_cond
PARAMS ((rtx
));
294 #ifndef ADDR_VEC_ALIGN
295 static int final_addr_vec_align
PARAMS ((rtx
));
297 #ifdef HAVE_ATTR_length
298 static int align_fuzz
PARAMS ((rtx
, rtx
, int, unsigned));
301 /* Initialize data in final at the beginning of a compilation. */
304 init_final (filename
)
305 const char *filename ATTRIBUTE_UNUSED
;
310 #ifdef ASSEMBLER_DIALECT
311 dialect_number
= ASSEMBLER_DIALECT
;
315 /* Called at end of source file,
316 to output the block-profiling table for this entire compilation. */
320 const char *filename
;
324 if (profile_block_flag
|| profile_arc_flag
)
327 int align
= exact_log2 (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
);
331 int long_bytes
= LONG_TYPE_SIZE
/ BITS_PER_UNIT
;
332 int pointer_bytes
= POINTER_SIZE
/ BITS_PER_UNIT
;
334 if (profile_block_flag
)
335 size
= long_bytes
* count_basic_blocks
;
337 size
= long_bytes
* count_instrumented_edges
;
340 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
341 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
342 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
346 /* Output the main header, of 11 words:
347 0: 1 if this file is initialized, else 0.
348 1: address of file name (LPBX1).
349 2: address of table of counts (LPBX2).
350 3: number of counts in the table.
351 4: always 0, for compatibility with Sun.
353 The following are GNU extensions:
355 5: address of table of start addrs of basic blocks (LPBX3).
356 6: Number of bytes in this header.
357 7: address of table of function names (LPBX4).
358 8: address of table of line numbers (LPBX5) or 0.
359 9: address of table of file names (LPBX6) or 0.
360 10: space reserved for basic block profiling. */
362 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
364 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file
, "LPBX", 0);
366 assemble_integer (const0_rtx
, long_bytes
, 1);
368 /* address of filename */
369 ASM_GENERATE_INTERNAL_LABEL (name
, "LPBX", 1);
370 assemble_integer (gen_rtx_SYMBOL_REF (Pmode
, name
), pointer_bytes
, 1);
372 /* address of count table */
373 ASM_GENERATE_INTERNAL_LABEL (name
, "LPBX", 2);
374 assemble_integer (gen_rtx_SYMBOL_REF (Pmode
, name
), pointer_bytes
, 1);
376 /* count of the # of basic blocks or # of instrumented arcs */
377 if (profile_block_flag
)
378 assemble_integer (GEN_INT (count_basic_blocks
), long_bytes
, 1);
380 assemble_integer (GEN_INT (count_instrumented_edges
), long_bytes
, 1);
382 /* zero word (link field) */
383 assemble_integer (const0_rtx
, pointer_bytes
, 1);
385 /* address of basic block start address table */
386 if (profile_block_flag
)
388 ASM_GENERATE_INTERNAL_LABEL (name
, "LPBX", 3);
389 assemble_integer (gen_rtx_SYMBOL_REF (Pmode
, name
), pointer_bytes
,
393 assemble_integer (const0_rtx
, pointer_bytes
, 1);
395 /* byte count for extended structure. */
396 assemble_integer (GEN_INT (11 * UNITS_PER_WORD
), long_bytes
, 1);
398 /* address of function name table */
399 if (profile_block_flag
)
401 ASM_GENERATE_INTERNAL_LABEL (name
, "LPBX", 4);
402 assemble_integer (gen_rtx_SYMBOL_REF (Pmode
, name
), pointer_bytes
,
406 assemble_integer (const0_rtx
, pointer_bytes
, 1);
408 /* address of line number and filename tables if debugging. */
409 if (write_symbols
!= NO_DEBUG
&& profile_block_flag
)
411 ASM_GENERATE_INTERNAL_LABEL (name
, "LPBX", 5);
412 assemble_integer (gen_rtx_SYMBOL_REF (Pmode
, name
),
414 ASM_GENERATE_INTERNAL_LABEL (name
, "LPBX", 6);
415 assemble_integer (gen_rtx_SYMBOL_REF (Pmode
, name
),
420 assemble_integer (const0_rtx
, pointer_bytes
, 1);
421 assemble_integer (const0_rtx
, pointer_bytes
, 1);
424 /* space for extension ptr (link field) */
425 assemble_integer (const0_rtx
, UNITS_PER_WORD
, 1);
427 /* Output the file name changing the suffix to .d for Sun tcov
429 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file
, "LPBX", 1);
431 char *cwd
= getpwd ();
432 int len
= strlen (filename
) + strlen (cwd
) + 1;
433 char *data_file
= (char *) alloca (len
+ 4);
435 strcpy (data_file
, cwd
);
436 strcat (data_file
, "/");
437 strcat (data_file
, filename
);
438 strip_off_ending (data_file
, len
);
439 if (profile_block_flag
)
440 strcat (data_file
, ".d");
442 strcat (data_file
, ".da");
443 assemble_string (data_file
, strlen (data_file
) + 1);
446 /* Make space for the table of counts. */
449 /* Realign data section. */
450 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
451 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file
, "LPBX", 2);
453 assemble_zeros (size
);
457 ASM_GENERATE_INTERNAL_LABEL (name
, "LPBX", 2);
458 #ifdef ASM_OUTPUT_SHARED_LOCAL
459 if (flag_shared_data
)
460 ASM_OUTPUT_SHARED_LOCAL (asm_out_file
, name
, size
, rounded
);
463 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
464 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
467 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
468 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
,
471 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
476 /* Output any basic block strings */
477 if (profile_block_flag
)
479 readonly_data_section ();
482 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
483 for (sptr
= sbb_head
; sptr
!= 0; sptr
= sptr
->next
)
485 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file
, "LPBC",
487 assemble_string (sptr
->string
, sptr
->length
);
492 /* Output the table of addresses. */
493 if (profile_block_flag
)
495 /* Realign in new section */
496 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
497 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file
, "LPBX", 3);
498 for (i
= 0; i
< count_basic_blocks
; i
++)
500 ASM_GENERATE_INTERNAL_LABEL (name
, "LPB", i
);
501 assemble_integer (gen_rtx_SYMBOL_REF (Pmode
, name
),
506 /* Output the table of function names. */
507 if (profile_block_flag
)
509 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file
, "LPBX", 4);
510 for ((ptr
= bb_head
), (i
= 0); ptr
!= 0; (ptr
= ptr
->next
), i
++)
512 if (ptr
->func_label_num
>= 0)
514 ASM_GENERATE_INTERNAL_LABEL (name
, "LPBC",
515 ptr
->func_label_num
);
516 assemble_integer (gen_rtx_SYMBOL_REF (Pmode
, name
),
520 assemble_integer (const0_rtx
, pointer_bytes
, 1);
523 for ( ; i
< count_basic_blocks
; i
++)
524 assemble_integer (const0_rtx
, pointer_bytes
, 1);
527 if (write_symbols
!= NO_DEBUG
&& profile_block_flag
)
529 /* Output the table of line numbers. */
530 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file
, "LPBX", 5);
531 for ((ptr
= bb_head
), (i
= 0); ptr
!= 0; (ptr
= ptr
->next
), i
++)
532 assemble_integer (GEN_INT (ptr
->line_num
), long_bytes
, 1);
534 for ( ; i
< count_basic_blocks
; i
++)
535 assemble_integer (const0_rtx
, long_bytes
, 1);
537 /* Output the table of file names. */
538 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file
, "LPBX", 6);
539 for ((ptr
= bb_head
), (i
= 0); ptr
!= 0; (ptr
= ptr
->next
), i
++)
541 if (ptr
->file_label_num
>= 0)
543 ASM_GENERATE_INTERNAL_LABEL (name
, "LPBC",
544 ptr
->file_label_num
);
545 assemble_integer (gen_rtx_SYMBOL_REF (Pmode
, name
),
549 assemble_integer (const0_rtx
, pointer_bytes
, 1);
552 for ( ; i
< count_basic_blocks
; i
++)
553 assemble_integer (const0_rtx
, pointer_bytes
, 1);
556 /* End with the address of the table of addresses,
557 so we can find it easily, as the last word in the file's text. */
558 if (profile_block_flag
)
560 ASM_GENERATE_INTERNAL_LABEL (name
, "LPBX", 3);
561 assemble_integer (gen_rtx_SYMBOL_REF (Pmode
, name
), pointer_bytes
,
567 /* Enable APP processing of subsequent output.
568 Used before the output from an `asm' statement. */
575 fputs (ASM_APP_ON
, asm_out_file
);
580 /* Disable APP processing of subsequent output.
581 Called from varasm.c before most kinds of output. */
588 fputs (ASM_APP_OFF
, asm_out_file
);
593 /* Return the number of slots filled in the current
594 delayed branch sequence (we don't count the insn needing the
595 delay slot). Zero if not in a delayed branch sequence. */
599 dbr_sequence_length ()
601 if (final_sequence
!= 0)
602 return XVECLEN (final_sequence
, 0) - 1;
608 /* The next two pages contain routines used to compute the length of an insn
609 and to shorten branches. */
611 /* Arrays for insn lengths, and addresses. The latter is referenced by
612 `insn_current_length'. */
614 static short *insn_lengths
;
617 /* Max uid for which the above arrays are valid. */
618 static int insn_lengths_max_uid
;
620 /* Address of insn being processed. Used by `insn_current_length'. */
621 int insn_current_address
;
623 /* Address of insn being processed in previous iteration. */
624 int insn_last_address
;
626 /* konwn invariant alignment of insn being processed. */
627 int insn_current_align
;
629 /* After shorten_branches, for any insn, uid_align[INSN_UID (insn)]
630 gives the next following alignment insn that increases the known
631 alignment, or NULL_RTX if there is no such insn.
632 For any alignment obtained this way, we can again index uid_align with
633 its uid to obtain the next following align that in turn increases the
634 alignment, till we reach NULL_RTX; the sequence obtained this way
635 for each insn we'll call the alignment chain of this insn in the following
638 struct label_alignment
{
643 static rtx
*uid_align
;
644 static int *uid_shuid
;
645 static struct label_alignment
*label_align
;
647 /* Indicate that branch shortening hasn't yet been done. */
666 insn_lengths_max_uid
= 0;
670 free (insn_addresses
);
680 /* Obtain the current length of an insn. If branch shortening has been done,
681 get its actual length. Otherwise, get its maximum length. */
684 get_attr_length (insn
)
685 rtx insn ATTRIBUTE_UNUSED
;
687 #ifdef HAVE_ATTR_length
692 if (insn_lengths_max_uid
> INSN_UID (insn
))
693 return insn_lengths
[INSN_UID (insn
)];
695 switch (GET_CODE (insn
))
703 length
= insn_default_length (insn
);
707 body
= PATTERN (insn
);
708 if (GET_CODE (body
) == ADDR_VEC
|| GET_CODE (body
) == ADDR_DIFF_VEC
)
710 /* Alignment is machine-dependent and should be handled by
714 length
= insn_default_length (insn
);
718 body
= PATTERN (insn
);
719 if (GET_CODE (body
) == USE
|| GET_CODE (body
) == CLOBBER
)
722 else if (GET_CODE (body
) == ASM_INPUT
|| asm_noperands (body
) >= 0)
723 length
= asm_insn_count (body
) * insn_default_length (insn
);
724 else if (GET_CODE (body
) == SEQUENCE
)
725 for (i
= 0; i
< XVECLEN (body
, 0); i
++)
726 length
+= get_attr_length (XVECEXP (body
, 0, i
));
728 length
= insn_default_length (insn
);
735 #ifdef ADJUST_INSN_LENGTH
736 ADJUST_INSN_LENGTH (insn
, length
);
739 #else /* not HAVE_ATTR_length */
741 #endif /* not HAVE_ATTR_length */
744 /* Code to handle alignment inside shorten_branches. */
746 /* Here is an explanation how the algorithm in align_fuzz can give
749 Call a sequence of instructions beginning with alignment point X
750 and continuing until the next alignment point `block X'. When `X'
751 is used in an expression, it means the alignment value of the
754 Call the distance between the start of the first insn of block X, and
755 the end of the last insn of block X `IX', for the `inner size of X'.
756 This is clearly the sum of the instruction lengths.
758 Likewise with the next alignment-delimited block following X, which we
761 Call the distance between the start of the first insn of block X, and
762 the start of the first insn of block Y `OX', for the `outer size of X'.
764 The estimated padding is then OX - IX.
766 OX can be safely estimated as
771 OX = round_up(IX, X) + Y - X
773 Clearly est(IX) >= real(IX), because that only depends on the
774 instruction lengths, and those being overestimated is a given.
776 Clearly round_up(foo, Z) >= round_up(bar, Z) if foo >= bar, so
777 we needn't worry about that when thinking about OX.
779 When X >= Y, the alignment provided by Y adds no uncertainty factor
780 for branch ranges starting before X, so we can just round what we have.
781 But when X < Y, we don't know anything about the, so to speak,
782 `middle bits', so we have to assume the worst when aligning up from an
783 address mod X to one mod Y, which is Y - X. */
786 #define LABEL_ALIGN(LABEL) align_labels_log
789 #ifndef LABEL_ALIGN_MAX_SKIP
790 #define LABEL_ALIGN_MAX_SKIP (align_labels-1)
794 #define LOOP_ALIGN(LABEL) align_loops_log
797 #ifndef LOOP_ALIGN_MAX_SKIP
798 #define LOOP_ALIGN_MAX_SKIP (align_loops-1)
801 #ifndef LABEL_ALIGN_AFTER_BARRIER
802 #define LABEL_ALIGN_AFTER_BARRIER(LABEL) align_jumps_log
805 #ifndef LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP
806 #define LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP (align_jumps-1)
809 #ifndef ADDR_VEC_ALIGN
811 final_addr_vec_align (addr_vec
)
814 int align
= exact_log2 (GET_MODE_SIZE (GET_MODE (PATTERN (addr_vec
))));
816 if (align
> BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
817 align
= BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
;
821 #define ADDR_VEC_ALIGN(ADDR_VEC) final_addr_vec_align (ADDR_VEC)
824 #ifndef INSN_LENGTH_ALIGNMENT
825 #define INSN_LENGTH_ALIGNMENT(INSN) length_unit_log
828 #define INSN_SHUID(INSN) (uid_shuid[INSN_UID (INSN)])
830 static int min_labelno
, max_labelno
;
832 #define LABEL_TO_ALIGNMENT(LABEL) \
833 (label_align[CODE_LABEL_NUMBER (LABEL) - min_labelno].alignment)
835 #define LABEL_TO_MAX_SKIP(LABEL) \
836 (label_align[CODE_LABEL_NUMBER (LABEL) - min_labelno].max_skip)
838 /* For the benefit of port specific code do this also as a function. */
840 label_to_alignment (label
)
843 return LABEL_TO_ALIGNMENT (label
);
846 #ifdef HAVE_ATTR_length
847 /* The differences in addresses
848 between a branch and its target might grow or shrink depending on
849 the alignment the start insn of the range (the branch for a forward
850 branch or the label for a backward branch) starts out on; if these
851 differences are used naively, they can even oscillate infinitely.
852 We therefore want to compute a 'worst case' address difference that
853 is independent of the alignment the start insn of the range end
854 up on, and that is at least as large as the actual difference.
855 The function align_fuzz calculates the amount we have to add to the
856 naively computed difference, by traversing the part of the alignment
857 chain of the start insn of the range that is in front of the end insn
858 of the range, and considering for each alignment the maximum amount
859 that it might contribute to a size increase.
861 For casesi tables, we also want to know worst case minimum amounts of
862 address difference, in case a machine description wants to introduce
863 some common offset that is added to all offsets in a table.
864 For this purpose, align_fuzz with a growth argument of 0 comuptes the
865 appropriate adjustment. */
868 /* Compute the maximum delta by which the difference of the addresses of
869 START and END might grow / shrink due to a different address for start
870 which changes the size of alignment insns between START and END.
871 KNOWN_ALIGN_LOG is the alignment known for START.
872 GROWTH should be ~0 if the objective is to compute potential code size
873 increase, and 0 if the objective is to compute potential shrink.
874 The return value is undefined for any other value of GROWTH. */
876 align_fuzz (start
, end
, known_align_log
, growth
)
881 int uid
= INSN_UID (start
);
883 int known_align
= 1 << known_align_log
;
884 int end_shuid
= INSN_SHUID (end
);
887 for (align_label
= uid_align
[uid
]; align_label
; align_label
= uid_align
[uid
])
889 int align_addr
, new_align
;
891 uid
= INSN_UID (align_label
);
892 align_addr
= insn_addresses
[uid
] - insn_lengths
[uid
];
893 if (uid_shuid
[uid
] > end_shuid
)
895 known_align_log
= LABEL_TO_ALIGNMENT (align_label
);
896 new_align
= 1 << known_align_log
;
897 if (new_align
< known_align
)
899 fuzz
+= (-align_addr
^ growth
) & (new_align
- known_align
);
900 known_align
= new_align
;
905 /* Compute a worst-case reference address of a branch so that it
906 can be safely used in the presence of aligned labels. Since the
907 size of the branch itself is unknown, the size of the branch is
908 not included in the range. I.e. for a forward branch, the reference
909 address is the end address of the branch as known from the previous
910 branch shortening pass, minus a value to account for possible size
911 increase due to alignment. For a backward branch, it is the start
912 address of the branch as known from the current pass, plus a value
913 to account for possible size increase due to alignment.
914 NB.: Therefore, the maximum offset allowed for backward branches needs
915 to exclude the branch size. */
917 insn_current_reference_address (branch
)
921 rtx seq
= NEXT_INSN (PREV_INSN (branch
));
922 int seq_uid
= INSN_UID (seq
);
923 if (GET_CODE (branch
) != JUMP_INSN
)
924 /* This can happen for example on the PA; the objective is to know the
925 offset to address something in front of the start of the function.
926 Thus, we can treat it like a backward branch.
927 We assume here that FUNCTION_BOUNDARY / BITS_PER_UNIT is larger than
928 any alignment we'd encounter, so we skip the call to align_fuzz. */
929 return insn_current_address
;
930 dest
= JUMP_LABEL (branch
);
931 /* BRANCH has no proper alignment chain set, so use SEQ. */
932 if (INSN_SHUID (branch
) < INSN_SHUID (dest
))
934 /* Forward branch. */
935 return (insn_last_address
+ insn_lengths
[seq_uid
]
936 - align_fuzz (seq
, dest
, length_unit_log
, ~0));
940 /* Backward branch. */
941 return (insn_current_address
942 + align_fuzz (dest
, seq
, length_unit_log
, ~0));
945 #endif /* HAVE_ATTR_length */
947 /* Make a pass over all insns and compute their actual lengths by shortening
948 any branches of variable length if possible. */
950 /* Give a default value for the lowest address in a function. */
952 #ifndef FIRST_INSN_ADDRESS
953 #define FIRST_INSN_ADDRESS 0
956 /* shorten_branches might be called multiple times: for example, the SH
957 port splits out-of-range conditional branches in MACHINE_DEPENDENT_REORG.
958 In order to do this, it needs proper length information, which it obtains
959 by calling shorten_branches. This cannot be collapsed with
960 shorten_branches itself into a single pass unless we also want to intergate
961 reorg.c, since the branch splitting exposes new instructions with delay
965 shorten_branches (first
)
966 rtx first ATTRIBUTE_UNUSED
;
973 #ifdef HAVE_ATTR_length
974 #define MAX_CODE_ALIGN 16
976 int something_changed
= 1;
977 char *varying_length
;
980 rtx align_tab
[MAX_CODE_ALIGN
];
982 /* In order to make sure that all instructions have valid length info,
983 we must split them before we compute the address/length info. */
985 for (insn
= NEXT_INSN (first
); insn
; insn
= NEXT_INSN (insn
))
986 if (GET_RTX_CLASS (GET_CODE (insn
)) == 'i')
989 /* Don't split the insn if it has been deleted. */
990 if (! INSN_DELETED_P (old
))
991 insn
= try_split (PATTERN (old
), old
, 1);
992 /* When not optimizing, the old insn will be still left around
993 with only the 'deleted' bit set. Transform it into a note
994 to avoid confusion of subsequent processing. */
995 if (INSN_DELETED_P (old
))
997 PUT_CODE (old
, NOTE
);
998 NOTE_LINE_NUMBER (old
) = NOTE_INSN_DELETED
;
999 NOTE_SOURCE_FILE (old
) = 0;
1004 /* We must do some computations even when not actually shortening, in
1005 order to get the alignment information for the labels. */
1007 init_insn_lengths ();
1009 /* Compute maximum UID and allocate label_align / uid_shuid. */
1010 max_uid
= get_max_uid ();
1012 max_labelno
= max_label_num ();
1013 min_labelno
= get_first_label_num ();
1014 label_align
= (struct label_alignment
*)
1015 xcalloc ((max_labelno
- min_labelno
+ 1), sizeof (struct label_alignment
));
1017 uid_shuid
= (int *) xmalloc (max_uid
* sizeof *uid_shuid
);
1019 /* Initialize label_align and set up uid_shuid to be strictly
1020 monotonically rising with insn order. */
1021 /* We use max_log here to keep track of the maximum alignment we want to
1022 impose on the next CODE_LABEL (or the current one if we are processing
1023 the CODE_LABEL itself). */
1028 for (insn
= get_insns (), i
= 1; insn
; insn
= NEXT_INSN (insn
))
1032 INSN_SHUID (insn
) = i
++;
1033 if (GET_RTX_CLASS (GET_CODE (insn
)) == 'i')
1035 /* reorg might make the first insn of a loop being run once only,
1036 and delete the label in front of it. Then we want to apply
1037 the loop alignment to the new label created by reorg, which
1038 is separated by the former loop start insn from the
1039 NOTE_INSN_LOOP_BEG. */
1041 else if (GET_CODE (insn
) == CODE_LABEL
)
1045 log
= LABEL_ALIGN (insn
);
1049 max_skip
= LABEL_ALIGN_MAX_SKIP
;
1051 next
= NEXT_INSN (insn
);
1052 /* ADDR_VECs only take room if read-only data goes into the text
1054 if (JUMP_TABLES_IN_TEXT_SECTION
1055 #if !defined(READONLY_DATA_SECTION)
1059 if (next
&& GET_CODE (next
) == JUMP_INSN
)
1061 rtx nextbody
= PATTERN (next
);
1062 if (GET_CODE (nextbody
) == ADDR_VEC
1063 || GET_CODE (nextbody
) == ADDR_DIFF_VEC
)
1065 log
= ADDR_VEC_ALIGN (next
);
1069 max_skip
= LABEL_ALIGN_MAX_SKIP
;
1073 LABEL_TO_ALIGNMENT (insn
) = max_log
;
1074 LABEL_TO_MAX_SKIP (insn
) = max_skip
;
1078 else if (GET_CODE (insn
) == BARRIER
)
1082 for (label
= insn
; label
&& GET_RTX_CLASS (GET_CODE (label
)) != 'i';
1083 label
= NEXT_INSN (label
))
1084 if (GET_CODE (label
) == CODE_LABEL
)
1086 log
= LABEL_ALIGN_AFTER_BARRIER (insn
);
1090 max_skip
= LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP
;
1095 /* Again, we allow NOTE_INSN_LOOP_BEG - INSN - CODE_LABEL
1096 sequences in order to handle reorg output efficiently. */
1097 else if (GET_CODE (insn
) == NOTE
1098 && NOTE_LINE_NUMBER (insn
) == NOTE_INSN_LOOP_BEG
)
1103 /* Search for the label that starts the loop.
1104 Don't skip past the end of the loop, since that could
1105 lead to putting an alignment where it does not belong.
1106 However, a label after a nested (non-)loop would be OK. */
1107 for (label
= insn
; label
; label
= NEXT_INSN (label
))
1109 if (GET_CODE (label
) == NOTE
1110 && NOTE_LINE_NUMBER (label
) == NOTE_INSN_LOOP_BEG
)
1112 else if (GET_CODE (label
) == NOTE
1113 && NOTE_LINE_NUMBER (label
) == NOTE_INSN_LOOP_END
1116 else if (GET_CODE (label
) == CODE_LABEL
)
1118 log
= LOOP_ALIGN (label
);
1122 max_skip
= LOOP_ALIGN_MAX_SKIP
;
1131 #ifdef HAVE_ATTR_length
1133 /* Allocate the rest of the arrays. */
1134 insn_lengths
= (short *) xmalloc (max_uid
* sizeof (short));
1135 insn_lengths_max_uid
= max_uid
;
1136 /* Syntax errors can lead to labels being outside of the main insn stream.
1137 Initialize insn_addresses, so that we get reproducible results. */
1138 insn_addresses
= (int *) xcalloc (max_uid
, sizeof (int));
1140 varying_length
= (char *) xcalloc (max_uid
, sizeof (char));
1142 /* Initialize uid_align. We scan instructions
1143 from end to start, and keep in align_tab[n] the last seen insn
1144 that does an alignment of at least n+1, i.e. the successor
1145 in the alignment chain for an insn that does / has a known
1147 uid_align
= (rtx
*) xcalloc (max_uid
, sizeof *uid_align
);
1149 for (i
= MAX_CODE_ALIGN
; --i
>= 0; )
1150 align_tab
[i
] = NULL_RTX
;
1151 seq
= get_last_insn ();
1152 for (; seq
; seq
= PREV_INSN (seq
))
1154 int uid
= INSN_UID (seq
);
1156 log
= (GET_CODE (seq
) == CODE_LABEL
? LABEL_TO_ALIGNMENT (seq
) : 0);
1157 uid_align
[uid
] = align_tab
[0];
1160 /* Found an alignment label. */
1161 uid_align
[uid
] = align_tab
[log
];
1162 for (i
= log
- 1; i
>= 0; i
--)
1166 #ifdef CASE_VECTOR_SHORTEN_MODE
1169 /* Look for ADDR_DIFF_VECs, and initialize their minimum and maximum
1172 int min_shuid
= INSN_SHUID (get_insns ()) - 1;
1173 int max_shuid
= INSN_SHUID (get_last_insn ()) + 1;
1176 for (insn
= first
; insn
!= 0; insn
= NEXT_INSN (insn
))
1178 rtx min_lab
= NULL_RTX
, max_lab
= NULL_RTX
, pat
;
1179 int len
, i
, min
, max
, insn_shuid
;
1181 addr_diff_vec_flags flags
;
1183 if (GET_CODE (insn
) != JUMP_INSN
1184 || GET_CODE (PATTERN (insn
)) != ADDR_DIFF_VEC
)
1186 pat
= PATTERN (insn
);
1187 len
= XVECLEN (pat
, 1);
1190 min_align
= MAX_CODE_ALIGN
;
1191 for (min
= max_shuid
, max
= min_shuid
, i
= len
- 1; i
>= 0; i
--)
1193 rtx lab
= XEXP (XVECEXP (pat
, 1, i
), 0);
1194 int shuid
= INSN_SHUID (lab
);
1205 if (min_align
> LABEL_TO_ALIGNMENT (lab
))
1206 min_align
= LABEL_TO_ALIGNMENT (lab
);
1208 XEXP (pat
, 2) = gen_rtx_LABEL_REF (VOIDmode
, min_lab
);
1209 XEXP (pat
, 3) = gen_rtx_LABEL_REF (VOIDmode
, max_lab
);
1210 insn_shuid
= INSN_SHUID (insn
);
1211 rel
= INSN_SHUID (XEXP (XEXP (pat
, 0), 0));
1212 flags
.min_align
= min_align
;
1213 flags
.base_after_vec
= rel
> insn_shuid
;
1214 flags
.min_after_vec
= min
> insn_shuid
;
1215 flags
.max_after_vec
= max
> insn_shuid
;
1216 flags
.min_after_base
= min
> rel
;
1217 flags
.max_after_base
= max
> rel
;
1218 ADDR_DIFF_VEC_FLAGS (pat
) = flags
;
1221 #endif /* CASE_VECTOR_SHORTEN_MODE */
1224 /* Compute initial lengths, addresses, and varying flags for each insn. */
1225 for (insn_current_address
= FIRST_INSN_ADDRESS
, insn
= first
;
1227 insn_current_address
+= insn_lengths
[uid
], insn
= NEXT_INSN (insn
))
1229 uid
= INSN_UID (insn
);
1231 insn_lengths
[uid
] = 0;
1233 if (GET_CODE (insn
) == CODE_LABEL
)
1235 int log
= LABEL_TO_ALIGNMENT (insn
);
1238 int align
= 1 << log
;
1239 int new_address
= (insn_current_address
+ align
- 1) & -align
;
1240 insn_lengths
[uid
] = new_address
- insn_current_address
;
1241 insn_current_address
= new_address
;
1245 insn_addresses
[uid
] = insn_current_address
;
1247 if (GET_CODE (insn
) == NOTE
|| GET_CODE (insn
) == BARRIER
1248 || GET_CODE (insn
) == CODE_LABEL
)
1250 if (INSN_DELETED_P (insn
))
1253 body
= PATTERN (insn
);
1254 if (GET_CODE (body
) == ADDR_VEC
|| GET_CODE (body
) == ADDR_DIFF_VEC
)
1256 /* This only takes room if read-only data goes into the text
1258 if (JUMP_TABLES_IN_TEXT_SECTION
1259 #if !defined(READONLY_DATA_SECTION)
1263 insn_lengths
[uid
] = (XVECLEN (body
,
1264 GET_CODE (body
) == ADDR_DIFF_VEC
)
1265 * GET_MODE_SIZE (GET_MODE (body
)));
1266 /* Alignment is handled by ADDR_VEC_ALIGN. */
1268 else if (GET_CODE (body
) == ASM_INPUT
|| asm_noperands (body
) >= 0)
1269 insn_lengths
[uid
] = asm_insn_count (body
) * insn_default_length (insn
);
1270 else if (GET_CODE (body
) == SEQUENCE
)
1273 int const_delay_slots
;
1275 const_delay_slots
= const_num_delay_slots (XVECEXP (body
, 0, 0));
1277 const_delay_slots
= 0;
1279 /* Inside a delay slot sequence, we do not do any branch shortening
1280 if the shortening could change the number of delay slots
1282 for (i
= 0; i
< XVECLEN (body
, 0); i
++)
1284 rtx inner_insn
= XVECEXP (body
, 0, i
);
1285 int inner_uid
= INSN_UID (inner_insn
);
1288 if (GET_CODE (body
) == ASM_INPUT
1289 || asm_noperands (PATTERN (XVECEXP (body
, 0, i
))) >= 0)
1290 inner_length
= (asm_insn_count (PATTERN (inner_insn
))
1291 * insn_default_length (inner_insn
));
1293 inner_length
= insn_default_length (inner_insn
);
1295 insn_lengths
[inner_uid
] = inner_length
;
1296 if (const_delay_slots
)
1298 if ((varying_length
[inner_uid
]
1299 = insn_variable_length_p (inner_insn
)) != 0)
1300 varying_length
[uid
] = 1;
1301 insn_addresses
[inner_uid
] = (insn_current_address
+
1305 varying_length
[inner_uid
] = 0;
1306 insn_lengths
[uid
] += inner_length
;
1309 else if (GET_CODE (body
) != USE
&& GET_CODE (body
) != CLOBBER
)
1311 insn_lengths
[uid
] = insn_default_length (insn
);
1312 varying_length
[uid
] = insn_variable_length_p (insn
);
1315 /* If needed, do any adjustment. */
1316 #ifdef ADJUST_INSN_LENGTH
1317 ADJUST_INSN_LENGTH (insn
, insn_lengths
[uid
]);
1318 if (insn_lengths
[uid
] < 0)
1319 fatal_insn ("Negative insn length", insn
);
1323 /* Now loop over all the insns finding varying length insns. For each,
1324 get the current insn length. If it has changed, reflect the change.
1325 When nothing changes for a full pass, we are done. */
1327 while (something_changed
)
1329 something_changed
= 0;
1330 insn_current_align
= MAX_CODE_ALIGN
- 1;
1331 for (insn_current_address
= FIRST_INSN_ADDRESS
, insn
= first
;
1333 insn
= NEXT_INSN (insn
))
1336 #ifdef ADJUST_INSN_LENGTH
1341 uid
= INSN_UID (insn
);
1343 if (GET_CODE (insn
) == CODE_LABEL
)
1345 int log
= LABEL_TO_ALIGNMENT (insn
);
1346 if (log
> insn_current_align
)
1348 int align
= 1 << log
;
1349 int new_address
= (insn_current_address
+ align
- 1) & -align
;
1350 insn_lengths
[uid
] = new_address
- insn_current_address
;
1351 insn_current_align
= log
;
1352 insn_current_address
= new_address
;
1355 insn_lengths
[uid
] = 0;
1356 insn_addresses
[uid
] = insn_current_address
;
1360 length_align
= INSN_LENGTH_ALIGNMENT (insn
);
1361 if (length_align
< insn_current_align
)
1362 insn_current_align
= length_align
;
1364 insn_last_address
= insn_addresses
[uid
];
1365 insn_addresses
[uid
] = insn_current_address
;
1367 #ifdef CASE_VECTOR_SHORTEN_MODE
1368 if (optimize
&& GET_CODE (insn
) == JUMP_INSN
1369 && GET_CODE (PATTERN (insn
)) == ADDR_DIFF_VEC
)
1371 rtx body
= PATTERN (insn
);
1372 int old_length
= insn_lengths
[uid
];
1373 rtx rel_lab
= XEXP (XEXP (body
, 0), 0);
1374 rtx min_lab
= XEXP (XEXP (body
, 2), 0);
1375 rtx max_lab
= XEXP (XEXP (body
, 3), 0);
1376 addr_diff_vec_flags flags
= ADDR_DIFF_VEC_FLAGS (body
);
1377 int rel_addr
= insn_addresses
[INSN_UID (rel_lab
)];
1378 int min_addr
= insn_addresses
[INSN_UID (min_lab
)];
1379 int max_addr
= insn_addresses
[INSN_UID (max_lab
)];
1383 /* Try to find a known alignment for rel_lab. */
1384 for (prev
= rel_lab
;
1386 && ! insn_lengths
[INSN_UID (prev
)]
1387 && ! (varying_length
[INSN_UID (prev
)] & 1);
1388 prev
= PREV_INSN (prev
))
1389 if (varying_length
[INSN_UID (prev
)] & 2)
1391 rel_align
= LABEL_TO_ALIGNMENT (prev
);
1395 /* See the comment on addr_diff_vec_flags in rtl.h for the
1396 meaning of the flags values. base: REL_LAB vec: INSN */
1397 /* Anything after INSN has still addresses from the last
1398 pass; adjust these so that they reflect our current
1399 estimate for this pass. */
1400 if (flags
.base_after_vec
)
1401 rel_addr
+= insn_current_address
- insn_last_address
;
1402 if (flags
.min_after_vec
)
1403 min_addr
+= insn_current_address
- insn_last_address
;
1404 if (flags
.max_after_vec
)
1405 max_addr
+= insn_current_address
- insn_last_address
;
1406 /* We want to know the worst case, i.e. lowest possible value
1407 for the offset of MIN_LAB. If MIN_LAB is after REL_LAB,
1408 its offset is positive, and we have to be wary of code shrink;
1409 otherwise, it is negative, and we have to be vary of code
1411 if (flags
.min_after_base
)
1413 /* If INSN is between REL_LAB and MIN_LAB, the size
1414 changes we are about to make can change the alignment
1415 within the observed offset, therefore we have to break
1416 it up into two parts that are independent. */
1417 if (! flags
.base_after_vec
&& flags
.min_after_vec
)
1419 min_addr
-= align_fuzz (rel_lab
, insn
, rel_align
, 0);
1420 min_addr
-= align_fuzz (insn
, min_lab
, 0, 0);
1423 min_addr
-= align_fuzz (rel_lab
, min_lab
, rel_align
, 0);
1427 if (flags
.base_after_vec
&& ! flags
.min_after_vec
)
1429 min_addr
-= align_fuzz (min_lab
, insn
, 0, ~0);
1430 min_addr
-= align_fuzz (insn
, rel_lab
, 0, ~0);
1433 min_addr
-= align_fuzz (min_lab
, rel_lab
, 0, ~0);
1435 /* Likewise, determine the highest lowest possible value
1436 for the offset of MAX_LAB. */
1437 if (flags
.max_after_base
)
1439 if (! flags
.base_after_vec
&& flags
.max_after_vec
)
1441 max_addr
+= align_fuzz (rel_lab
, insn
, rel_align
, ~0);
1442 max_addr
+= align_fuzz (insn
, max_lab
, 0, ~0);
1445 max_addr
+= align_fuzz (rel_lab
, max_lab
, rel_align
, ~0);
1449 if (flags
.base_after_vec
&& ! flags
.max_after_vec
)
1451 max_addr
+= align_fuzz (max_lab
, insn
, 0, 0);
1452 max_addr
+= align_fuzz (insn
, rel_lab
, 0, 0);
1455 max_addr
+= align_fuzz (max_lab
, rel_lab
, 0, 0);
1457 PUT_MODE (body
, CASE_VECTOR_SHORTEN_MODE (min_addr
- rel_addr
,
1458 max_addr
- rel_addr
,
1460 if (JUMP_TABLES_IN_TEXT_SECTION
1461 #if !defined(READONLY_DATA_SECTION)
1467 = (XVECLEN (body
, 1) * GET_MODE_SIZE (GET_MODE (body
)));
1468 insn_current_address
+= insn_lengths
[uid
];
1469 if (insn_lengths
[uid
] != old_length
)
1470 something_changed
= 1;
1475 #endif /* CASE_VECTOR_SHORTEN_MODE */
1477 if (! (varying_length
[uid
]))
1479 insn_current_address
+= insn_lengths
[uid
];
1482 if (GET_CODE (insn
) == INSN
&& GET_CODE (PATTERN (insn
)) == SEQUENCE
)
1486 body
= PATTERN (insn
);
1488 for (i
= 0; i
< XVECLEN (body
, 0); i
++)
1490 rtx inner_insn
= XVECEXP (body
, 0, i
);
1491 int inner_uid
= INSN_UID (inner_insn
);
1494 insn_addresses
[inner_uid
] = insn_current_address
;
1496 /* insn_current_length returns 0 for insns with a
1497 non-varying length. */
1498 if (! varying_length
[inner_uid
])
1499 inner_length
= insn_lengths
[inner_uid
];
1501 inner_length
= insn_current_length (inner_insn
);
1503 if (inner_length
!= insn_lengths
[inner_uid
])
1505 insn_lengths
[inner_uid
] = inner_length
;
1506 something_changed
= 1;
1508 insn_current_address
+= insn_lengths
[inner_uid
];
1509 new_length
+= inner_length
;
1514 new_length
= insn_current_length (insn
);
1515 insn_current_address
+= new_length
;
1518 #ifdef ADJUST_INSN_LENGTH
1519 /* If needed, do any adjustment. */
1520 tmp_length
= new_length
;
1521 ADJUST_INSN_LENGTH (insn
, new_length
);
1522 insn_current_address
+= (new_length
- tmp_length
);
1525 if (new_length
!= insn_lengths
[uid
])
1527 insn_lengths
[uid
] = new_length
;
1528 something_changed
= 1;
1531 /* For a non-optimizing compile, do only a single pass. */
1536 free (varying_length
);
1538 #endif /* HAVE_ATTR_length */
1541 #ifdef HAVE_ATTR_length
1542 /* Given the body of an INSN known to be generated by an ASM statement, return
1543 the number of machine instructions likely to be generated for this insn.
1544 This is used to compute its length. */
1547 asm_insn_count (body
)
1550 const char *template;
1553 if (GET_CODE (body
) == ASM_INPUT
)
1554 template = XSTR (body
, 0);
1556 template = decode_asm_operands (body
, NULL_PTR
, NULL_PTR
,
1557 NULL_PTR
, NULL_PTR
);
1559 for ( ; *template; template++)
1560 if (IS_ASM_LOGICAL_LINE_SEPARATOR(*template) || *template == '\n')
1567 /* Output assembler code for the start of a function,
1568 and initialize some of the variables in this file
1569 for the new function. The label for the function and associated
1570 assembler pseudo-ops have already been output in `assemble_start_function'.
1572 FIRST is the first insn of the rtl for the function being compiled.
1573 FILE is the file to write assembler code to.
1574 OPTIMIZE is nonzero if we should eliminate redundant
1575 test and compare insns. */
1578 final_start_function (first
, file
, optimize
)
1581 int optimize ATTRIBUTE_UNUSED
;
1585 this_is_asm_operands
= 0;
1587 #ifdef NON_SAVING_SETJMP
1588 /* A function that calls setjmp should save and restore all the
1589 call-saved registers on a system where longjmp clobbers them. */
1590 if (NON_SAVING_SETJMP
&& current_function_calls_setjmp
)
1594 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
1595 if (!call_used_regs
[i
])
1596 regs_ever_live
[i
] = 1;
1600 /* Initial line number is supposed to be output
1601 before the function's prologue and label
1602 so that the function's address will not appear to be
1603 in the last statement of the preceding function. */
1604 if (NOTE_LINE_NUMBER (first
) != NOTE_INSN_DELETED
)
1605 last_linenum
= high_block_linenum
= high_function_linenum
1606 = NOTE_LINE_NUMBER (first
);
1608 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
1609 /* Output DWARF definition of the function. */
1610 if (dwarf2out_do_frame ())
1611 dwarf2out_begin_prologue ();
1613 current_function_func_begin_label
= 0;
1616 /* For SDB and XCOFF, the function beginning must be marked between
1617 the function label and the prologue. We always need this, even when
1618 -g1 was used. Defer on MIPS systems so that parameter descriptions
1619 follow function entry. */
1620 #if defined(SDB_DEBUGGING_INFO) && !defined(MIPS_DEBUGGING_INFO)
1621 if (write_symbols
== SDB_DEBUG
)
1622 sdbout_begin_function (last_linenum
);
1625 #ifdef XCOFF_DEBUGGING_INFO
1626 if (write_symbols
== XCOFF_DEBUG
)
1627 xcoffout_begin_function (file
, last_linenum
);
1630 /* But only output line number for other debug info types if -g2
1632 if (NOTE_LINE_NUMBER (first
) != NOTE_INSN_DELETED
)
1633 output_source_line (file
, first
);
1635 #ifdef LEAF_REG_REMAP
1636 if (current_function_uses_only_leaf_regs
)
1637 leaf_renumber_regs (first
);
1640 /* The Sun386i and perhaps other machines don't work right
1641 if the profiling code comes after the prologue. */
1642 #ifdef PROFILE_BEFORE_PROLOGUE
1644 profile_function (file
);
1645 #endif /* PROFILE_BEFORE_PROLOGUE */
1647 #if defined (DWARF2_UNWIND_INFO) && defined (HAVE_prologue)
1648 if (dwarf2out_do_frame ())
1649 dwarf2out_frame_debug (NULL_RTX
);
1652 /* If debugging, assign block numbers to all of the blocks in this
1656 number_blocks (current_function_decl
);
1657 remove_unnecessary_notes ();
1658 /* We never actually put out begin/end notes for the top-level
1659 block in the function. But, conceptually, that block is
1661 TREE_ASM_WRITTEN (DECL_INITIAL (current_function_decl
)) = 1;
1664 #ifdef FUNCTION_PROLOGUE
1665 /* First output the function prologue: code to set up the stack frame. */
1666 FUNCTION_PROLOGUE (file
, get_frame_size ());
1669 /* If the machine represents the prologue as RTL, the profiling code must
1670 be emitted when NOTE_INSN_PROLOGUE_END is scanned. */
1671 #ifdef HAVE_prologue
1672 if (! HAVE_prologue
)
1674 profile_after_prologue (file
);
1678 /* If we are doing basic block profiling, remember a printable version
1679 of the function name. */
1680 if (profile_block_flag
)
1683 = add_bb_string ((*decl_printable_name
) (current_function_decl
, 2), FALSE
);
1688 profile_after_prologue (file
)
1689 FILE *file ATTRIBUTE_UNUSED
;
1691 #ifdef FUNCTION_BLOCK_PROFILER
1692 if (profile_block_flag
)
1694 FUNCTION_BLOCK_PROFILER (file
, count_basic_blocks
);
1696 #endif /* FUNCTION_BLOCK_PROFILER */
1698 #ifndef PROFILE_BEFORE_PROLOGUE
1700 profile_function (file
);
1701 #endif /* not PROFILE_BEFORE_PROLOGUE */
1705 profile_function (file
)
1708 int align
= MIN (BIGGEST_ALIGNMENT
, LONG_TYPE_SIZE
);
1709 #if defined(ASM_OUTPUT_REG_PUSH)
1710 #if defined(STRUCT_VALUE_INCOMING_REGNUM) || defined(STRUCT_VALUE_REGNUM)
1711 int sval
= current_function_returns_struct
;
1713 #if defined(STATIC_CHAIN_INCOMING_REGNUM) || defined(STATIC_CHAIN_REGNUM)
1714 int cxt
= current_function_needs_context
;
1716 #endif /* ASM_OUTPUT_REG_PUSH */
1719 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
1720 ASM_OUTPUT_INTERNAL_LABEL (file
, "LP", profile_label_no
);
1721 assemble_integer (const0_rtx
, LONG_TYPE_SIZE
/ BITS_PER_UNIT
, 1);
1723 function_section (current_function_decl
);
1725 #if defined(STRUCT_VALUE_INCOMING_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1727 ASM_OUTPUT_REG_PUSH (file
, STRUCT_VALUE_INCOMING_REGNUM
);
1729 #if defined(STRUCT_VALUE_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1732 ASM_OUTPUT_REG_PUSH (file
, STRUCT_VALUE_REGNUM
);
1737 #if defined(STATIC_CHAIN_INCOMING_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1739 ASM_OUTPUT_REG_PUSH (file
, STATIC_CHAIN_INCOMING_REGNUM
);
1741 #if defined(STATIC_CHAIN_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1744 ASM_OUTPUT_REG_PUSH (file
, STATIC_CHAIN_REGNUM
);
1749 FUNCTION_PROFILER (file
, profile_label_no
);
1751 #if defined(STATIC_CHAIN_INCOMING_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1753 ASM_OUTPUT_REG_POP (file
, STATIC_CHAIN_INCOMING_REGNUM
);
1755 #if defined(STATIC_CHAIN_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1758 ASM_OUTPUT_REG_POP (file
, STATIC_CHAIN_REGNUM
);
1763 #if defined(STRUCT_VALUE_INCOMING_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1765 ASM_OUTPUT_REG_POP (file
, STRUCT_VALUE_INCOMING_REGNUM
);
1767 #if defined(STRUCT_VALUE_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
1770 ASM_OUTPUT_REG_POP (file
, STRUCT_VALUE_REGNUM
);
1776 /* Output assembler code for the end of a function.
1777 For clarity, args are same as those of `final_start_function'
1778 even though not all of them are needed. */
1781 final_end_function (first
, file
, optimize
)
1782 rtx first ATTRIBUTE_UNUSED
;
1783 FILE *file ATTRIBUTE_UNUSED
;
1784 int optimize ATTRIBUTE_UNUSED
;
1788 #ifdef SDB_DEBUGGING_INFO
1789 if (write_symbols
== SDB_DEBUG
)
1790 sdbout_end_function (high_function_linenum
);
1793 #ifdef DWARF_DEBUGGING_INFO
1794 if (write_symbols
== DWARF_DEBUG
)
1795 dwarfout_end_function ();
1798 #ifdef XCOFF_DEBUGGING_INFO
1799 if (write_symbols
== XCOFF_DEBUG
)
1800 xcoffout_end_function (file
, high_function_linenum
);
1803 #ifdef FUNCTION_EPILOGUE
1804 /* Finally, output the function epilogue:
1805 code to restore the stack frame and return to the caller. */
1806 FUNCTION_EPILOGUE (file
, get_frame_size ());
1809 #ifdef SDB_DEBUGGING_INFO
1810 if (write_symbols
== SDB_DEBUG
)
1811 sdbout_end_epilogue ();
1814 #ifdef DWARF_DEBUGGING_INFO
1815 if (write_symbols
== DWARF_DEBUG
)
1816 dwarfout_end_epilogue ();
1819 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
1820 if (dwarf2out_do_frame ())
1821 dwarf2out_end_epilogue ();
1824 #ifdef XCOFF_DEBUGGING_INFO
1825 if (write_symbols
== XCOFF_DEBUG
)
1826 xcoffout_end_epilogue (file
);
1829 bb_func_label_num
= -1; /* not in function, nuke label # */
1831 #ifdef IA64_UNWIND_INFO
1832 output_function_exception_table ();
1835 /* If FUNCTION_EPILOGUE is not defined, then the function body
1836 itself contains return instructions wherever needed. */
1839 /* Add a block to the linked list that remembers the current line/file/function
1840 for basic block profiling. Emit the label in front of the basic block and
1841 the instructions that increment the count field. */
1847 struct bb_list
*ptr
= (struct bb_list
*) permalloc (sizeof (struct bb_list
));
1849 /* Add basic block to linked list. */
1851 ptr
->line_num
= last_linenum
;
1852 ptr
->file_label_num
= bb_file_label_num
;
1853 ptr
->func_label_num
= bb_func_label_num
;
1855 bb_tail
= &ptr
->next
;
1857 /* Enable the table of basic-block use counts
1858 to point at the code it applies to. */
1859 ASM_OUTPUT_INTERNAL_LABEL (file
, "LPB", count_basic_blocks
);
1861 /* Before first insn of this basic block, increment the
1862 count of times it was entered. */
1863 #ifdef BLOCK_PROFILER
1864 BLOCK_PROFILER (file
, count_basic_blocks
);
1871 count_basic_blocks
++;
1874 /* Add a string to be used for basic block profiling. */
1877 add_bb_string (string
, perm_p
)
1882 struct bb_str
*ptr
= 0;
1886 string
= "<unknown>";
1890 /* Allocate a new string if the current string isn't permanent. If
1891 the string is permanent search for the same string in other
1894 len
= strlen (string
) + 1;
1897 char *p
= (char *) permalloc (len
);
1898 bcopy (string
, p
, len
);
1902 for (ptr
= sbb_head
; ptr
!= (struct bb_str
*) 0; ptr
= ptr
->next
)
1903 if (ptr
->string
== string
)
1906 /* Allocate a new string block if we need to. */
1909 ptr
= (struct bb_str
*) permalloc (sizeof (*ptr
));
1912 ptr
->label_num
= sbb_label_num
++;
1913 ptr
->string
= string
;
1915 sbb_tail
= &ptr
->next
;
1918 return ptr
->label_num
;
1922 /* Output assembler code for some insns: all or part of a function.
1923 For description of args, see `final_start_function', above.
1925 PRESCAN is 1 if we are not really outputting,
1926 just scanning as if we were outputting.
1927 Prescanning deletes and rearranges insns just like ordinary output.
1928 PRESCAN is -2 if we are outputting after having prescanned.
1929 In this case, don't try to delete or rearrange insns
1930 because that has already been done.
1931 Prescanning is done only on certain machines. */
1934 final (first
, file
, optimize
, prescan
)
1944 last_ignored_compare
= 0;
1947 check_exception_handler_labels ();
1949 /* Make a map indicating which line numbers appear in this function.
1950 When producing SDB debugging info, delete troublesome line number
1951 notes from inlined functions in other files as well as duplicate
1952 line number notes. */
1953 #ifdef SDB_DEBUGGING_INFO
1954 if (write_symbols
== SDB_DEBUG
)
1957 for (insn
= first
; insn
; insn
= NEXT_INSN (insn
))
1958 if (GET_CODE (insn
) == NOTE
&& NOTE_LINE_NUMBER (insn
) > 0)
1960 if ((RTX_INTEGRATED_P (insn
)
1961 && strcmp (NOTE_SOURCE_FILE (insn
), main_input_filename
) != 0)
1963 && NOTE_LINE_NUMBER (insn
) == NOTE_LINE_NUMBER (last
)
1964 && NOTE_SOURCE_FILE (insn
) == NOTE_SOURCE_FILE (last
)))
1966 NOTE_LINE_NUMBER (insn
) = NOTE_INSN_DELETED
;
1967 NOTE_SOURCE_FILE (insn
) = 0;
1971 if (NOTE_LINE_NUMBER (insn
) > max_line
)
1972 max_line
= NOTE_LINE_NUMBER (insn
);
1978 for (insn
= first
; insn
; insn
= NEXT_INSN (insn
))
1979 if (GET_CODE (insn
) == NOTE
&& NOTE_LINE_NUMBER (insn
) > max_line
)
1980 max_line
= NOTE_LINE_NUMBER (insn
);
1983 line_note_exists
= (char *) xcalloc (max_line
+ 1, sizeof (char));
1985 for (insn
= first
; insn
; insn
= NEXT_INSN (insn
))
1987 if (INSN_UID (insn
) > max_uid
) /* find largest UID */
1988 max_uid
= INSN_UID (insn
);
1989 if (GET_CODE (insn
) == NOTE
&& NOTE_LINE_NUMBER (insn
) > 0)
1990 line_note_exists
[NOTE_LINE_NUMBER (insn
)] = 1;
1992 /* If CC tracking across branches is enabled, record the insn which
1993 jumps to each branch only reached from one place. */
1994 if (optimize
&& GET_CODE (insn
) == JUMP_INSN
)
1996 rtx lab
= JUMP_LABEL (insn
);
1997 if (lab
&& LABEL_NUSES (lab
) == 1)
1999 LABEL_REFS (lab
) = insn
;
2005 /* Initialize insn_eh_region table if eh is being used. */
2007 init_insn_eh_region (first
, max_uid
);
2013 /* Output the insns. */
2014 for (insn
= NEXT_INSN (first
); insn
;)
2016 #ifdef HAVE_ATTR_length
2017 insn_current_address
= insn_addresses
[INSN_UID (insn
)];
2019 insn
= final_scan_insn (insn
, file
, optimize
, prescan
, 0);
2022 /* Do basic-block profiling here
2023 if the last insn was a conditional branch. */
2024 if (profile_block_flag
&& new_block
)
2027 free_insn_eh_region ();
2028 free (line_note_exists
);
2029 line_note_exists
= NULL
;
2033 get_insn_template (code
, insn
)
2037 const void *output
= insn_data
[code
].output
;
2038 switch (insn_data
[code
].output_format
)
2040 case INSN_OUTPUT_FORMAT_SINGLE
:
2041 return (const char *) output
;
2042 case INSN_OUTPUT_FORMAT_MULTI
:
2043 return ((const char * const *) output
)[which_alternative
];
2044 case INSN_OUTPUT_FORMAT_FUNCTION
:
2047 return (* (insn_output_fn
) output
) (recog_data
.operand
, insn
);
2053 /* The final scan for one insn, INSN.
2054 Args are same as in `final', except that INSN
2055 is the insn being scanned.
2056 Value returned is the next insn to be scanned.
2058 NOPEEPHOLES is the flag to disallow peephole processing (currently
2059 used for within delayed branch sequence output). */
2062 final_scan_insn (insn
, file
, optimize
, prescan
, nopeepholes
)
2065 int optimize ATTRIBUTE_UNUSED
;
2067 int nopeepholes ATTRIBUTE_UNUSED
;
2075 /* Ignore deleted insns. These can occur when we split insns (due to a
2076 template of "#") while not optimizing. */
2077 if (INSN_DELETED_P (insn
))
2078 return NEXT_INSN (insn
);
2080 switch (GET_CODE (insn
))
2086 switch (NOTE_LINE_NUMBER (insn
))
2088 case NOTE_INSN_DELETED
:
2089 case NOTE_INSN_LOOP_BEG
:
2090 case NOTE_INSN_LOOP_END
:
2091 case NOTE_INSN_LOOP_CONT
:
2092 case NOTE_INSN_LOOP_VTOP
:
2093 case NOTE_INSN_FUNCTION_END
:
2094 case NOTE_INSN_SETJMP
:
2095 case NOTE_INSN_REPEATED_LINE_NUMBER
:
2096 case NOTE_INSN_RANGE_BEG
:
2097 case NOTE_INSN_RANGE_END
:
2098 case NOTE_INSN_LIVE
:
2099 case NOTE_INSN_EXPECTED_VALUE
:
2102 case NOTE_INSN_BASIC_BLOCK
:
2104 fprintf (asm_out_file
, "\t%s basic block %d\n",
2105 ASM_COMMENT_START
, NOTE_BASIC_BLOCK (insn
)->index
);
2108 case NOTE_INSN_EH_REGION_BEG
:
2109 if (! exceptions_via_longjmp
)
2111 ASM_OUTPUT_INTERNAL_LABEL (file
, "LEHB", NOTE_EH_HANDLER (insn
));
2112 if (! flag_new_exceptions
)
2113 add_eh_table_entry (NOTE_EH_HANDLER (insn
));
2114 #ifdef ASM_OUTPUT_EH_REGION_BEG
2115 ASM_OUTPUT_EH_REGION_BEG (file
, NOTE_EH_HANDLER (insn
));
2120 case NOTE_INSN_EH_REGION_END
:
2121 if (! exceptions_via_longjmp
)
2123 ASM_OUTPUT_INTERNAL_LABEL (file
, "LEHE", NOTE_EH_HANDLER (insn
));
2124 if (flag_new_exceptions
)
2125 add_eh_table_entry (NOTE_EH_HANDLER (insn
));
2126 #ifdef ASM_OUTPUT_EH_REGION_END
2127 ASM_OUTPUT_EH_REGION_END (file
, NOTE_EH_HANDLER (insn
));
2132 case NOTE_INSN_PROLOGUE_END
:
2133 #ifdef FUNCTION_END_PROLOGUE
2134 FUNCTION_END_PROLOGUE (file
);
2136 profile_after_prologue (file
);
2139 case NOTE_INSN_EPILOGUE_BEG
:
2140 #ifdef FUNCTION_BEGIN_EPILOGUE
2141 FUNCTION_BEGIN_EPILOGUE (file
);
2145 case NOTE_INSN_FUNCTION_BEG
:
2146 #if defined(SDB_DEBUGGING_INFO) && defined(MIPS_DEBUGGING_INFO)
2147 /* MIPS stabs require the parameter descriptions to be after the
2148 function entry point rather than before. */
2149 if (write_symbols
== SDB_DEBUG
)
2152 sdbout_begin_function (last_linenum
);
2155 #ifdef DWARF_DEBUGGING_INFO
2156 /* This outputs a marker where the function body starts, so it
2157 must be after the prologue. */
2158 if (write_symbols
== DWARF_DEBUG
)
2161 dwarfout_begin_function ();
2166 case NOTE_INSN_BLOCK_BEG
:
2167 if (debug_info_level
== DINFO_LEVEL_NORMAL
2168 || debug_info_level
== DINFO_LEVEL_VERBOSE
2169 || write_symbols
== DWARF_DEBUG
2170 || write_symbols
== DWARF2_DEBUG
)
2172 int n
= BLOCK_NUMBER (NOTE_BLOCK (insn
));
2176 high_block_linenum
= last_linenum
;
2178 /* Output debugging info about the symbol-block beginning. */
2179 #ifdef SDB_DEBUGGING_INFO
2180 if (write_symbols
== SDB_DEBUG
)
2181 sdbout_begin_block (file
, last_linenum
, n
);
2183 #ifdef XCOFF_DEBUGGING_INFO
2184 if (write_symbols
== XCOFF_DEBUG
)
2185 xcoffout_begin_block (file
, last_linenum
, n
);
2187 #ifdef DBX_DEBUGGING_INFO
2188 if (write_symbols
== DBX_DEBUG
)
2189 ASM_OUTPUT_INTERNAL_LABEL (file
, "LBB", n
);
2191 #ifdef DWARF_DEBUGGING_INFO
2192 if (write_symbols
== DWARF_DEBUG
)
2193 dwarfout_begin_block (n
);
2195 #ifdef DWARF2_DEBUGGING_INFO
2196 if (write_symbols
== DWARF2_DEBUG
)
2197 dwarf2out_begin_block (n
);
2200 /* Mark this block as output. */
2201 TREE_ASM_WRITTEN (NOTE_BLOCK (insn
)) = 1;
2205 case NOTE_INSN_BLOCK_END
:
2206 if (debug_info_level
== DINFO_LEVEL_NORMAL
2207 || debug_info_level
== DINFO_LEVEL_VERBOSE
2208 || write_symbols
== DWARF_DEBUG
2209 || write_symbols
== DWARF2_DEBUG
)
2211 int n
= BLOCK_NUMBER (NOTE_BLOCK (insn
));
2215 /* End of a symbol-block. */
2217 if (block_depth
< 0)
2220 #ifdef XCOFF_DEBUGGING_INFO
2221 if (write_symbols
== XCOFF_DEBUG
)
2222 xcoffout_end_block (file
, high_block_linenum
, n
);
2224 #ifdef DBX_DEBUGGING_INFO
2225 if (write_symbols
== DBX_DEBUG
)
2226 ASM_OUTPUT_INTERNAL_LABEL (file
, "LBE", n
);
2228 #ifdef SDB_DEBUGGING_INFO
2229 if (write_symbols
== SDB_DEBUG
)
2230 sdbout_end_block (file
, high_block_linenum
, n
);
2232 #ifdef DWARF_DEBUGGING_INFO
2233 if (write_symbols
== DWARF_DEBUG
)
2234 dwarfout_end_block (n
);
2236 #ifdef DWARF2_DEBUGGING_INFO
2237 if (write_symbols
== DWARF2_DEBUG
)
2238 dwarf2out_end_block (n
);
2243 case NOTE_INSN_DELETED_LABEL
:
2244 /* Emit the label. We may have deleted the CODE_LABEL because
2245 the label could be proved to be unreachable, though still
2246 referenced (in the form of having its address taken. */
2247 /* ??? Figure out how not to do this unconditionally. This
2248 interferes with bundling on LIW targets. */
2249 ASM_OUTPUT_INTERNAL_LABEL (file
, "L", CODE_LABEL_NUMBER (insn
));
2251 if (debug_info_level
== DINFO_LEVEL_NORMAL
2252 || debug_info_level
== DINFO_LEVEL_VERBOSE
)
2254 #ifdef DWARF_DEBUGGING_INFO
2255 if (write_symbols
== DWARF_DEBUG
)
2256 dwarfout_label (insn
);
2258 #ifdef DWARF2_DEBUGGING_INFO
2259 if (write_symbols
== DWARF2_DEBUG
)
2260 dwarf2out_label (insn
);
2269 if (NOTE_LINE_NUMBER (insn
) <= 0)
2272 /* This note is a line-number. */
2277 /* If there is anything real after this note, output it.
2278 If another line note follows, omit this one. */
2279 for (note
= NEXT_INSN (insn
); note
; note
= NEXT_INSN (note
))
2281 if (GET_CODE (note
) != NOTE
&& GET_CODE (note
) != CODE_LABEL
)
2284 /* These types of notes can be significant
2285 so make sure the preceding line number stays. */
2286 else if (GET_CODE (note
) == NOTE
2287 && (NOTE_LINE_NUMBER (note
) == NOTE_INSN_BLOCK_BEG
2288 || NOTE_LINE_NUMBER (note
) == NOTE_INSN_BLOCK_END
2289 || NOTE_LINE_NUMBER (note
) == NOTE_INSN_FUNCTION_BEG
))
2291 else if (GET_CODE (note
) == NOTE
&& NOTE_LINE_NUMBER (note
) > 0)
2293 /* Another line note follows; we can delete this note
2294 if no intervening line numbers have notes elsewhere. */
2296 for (num
= NOTE_LINE_NUMBER (insn
) + 1;
2297 num
< NOTE_LINE_NUMBER (note
);
2299 if (line_note_exists
[num
])
2302 if (num
>= NOTE_LINE_NUMBER (note
))
2308 /* Output this line note if it is the first or the last line
2311 output_source_line (file
, insn
);
2318 #if defined (DWARF2_UNWIND_INFO)
2319 /* If we push arguments, we need to check all insns for stack
2321 if (!ACCUMULATE_OUTGOING_ARGS
&& dwarf2out_do_frame ())
2322 dwarf2out_frame_debug (insn
);
2327 /* The target port might emit labels in the output function for
2328 some insn, e.g. sh.c output_branchy_insn. */
2329 if (CODE_LABEL_NUMBER (insn
) <= max_labelno
)
2331 int align
= LABEL_TO_ALIGNMENT (insn
);
2332 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
2333 int max_skip
= LABEL_TO_MAX_SKIP (insn
);
2336 if (align
&& NEXT_INSN (insn
))
2337 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
2338 ASM_OUTPUT_MAX_SKIP_ALIGN (file
, align
, max_skip
);
2340 ASM_OUTPUT_ALIGN (file
, align
);
2345 /* If this label is reached from only one place, set the condition
2346 codes from the instruction just before the branch. */
2348 /* Disabled because some insns set cc_status in the C output code
2349 and NOTICE_UPDATE_CC alone can set incorrect status. */
2350 if (0 /* optimize && LABEL_NUSES (insn) == 1*/)
2352 rtx jump
= LABEL_REFS (insn
);
2353 rtx barrier
= prev_nonnote_insn (insn
);
2355 /* If the LABEL_REFS field of this label has been set to point
2356 at a branch, the predecessor of the branch is a regular
2357 insn, and that branch is the only way to reach this label,
2358 set the condition codes based on the branch and its
2360 if (barrier
&& GET_CODE (barrier
) == BARRIER
2361 && jump
&& GET_CODE (jump
) == JUMP_INSN
2362 && (prev
= prev_nonnote_insn (jump
))
2363 && GET_CODE (prev
) == INSN
)
2365 NOTICE_UPDATE_CC (PATTERN (prev
), prev
);
2366 NOTICE_UPDATE_CC (PATTERN (jump
), jump
);
2374 #ifdef FINAL_PRESCAN_LABEL
2375 FINAL_PRESCAN_INSN (insn
, NULL_PTR
, 0);
2378 #ifdef SDB_DEBUGGING_INFO
2379 if (write_symbols
== SDB_DEBUG
&& LABEL_NAME (insn
))
2380 sdbout_label (insn
);
2382 #ifdef DWARF_DEBUGGING_INFO
2383 if (write_symbols
== DWARF_DEBUG
&& LABEL_NAME (insn
))
2384 dwarfout_label (insn
);
2386 #ifdef DWARF2_DEBUGGING_INFO
2387 if (write_symbols
== DWARF2_DEBUG
&& LABEL_NAME (insn
))
2388 dwarf2out_label (insn
);
2392 fputs (ASM_APP_OFF
, file
);
2395 if (NEXT_INSN (insn
) != 0
2396 && GET_CODE (NEXT_INSN (insn
)) == JUMP_INSN
)
2398 rtx nextbody
= PATTERN (NEXT_INSN (insn
));
2400 /* If this label is followed by a jump-table,
2401 make sure we put the label in the read-only section. Also
2402 possibly write the label and jump table together. */
2404 if (GET_CODE (nextbody
) == ADDR_VEC
2405 || GET_CODE (nextbody
) == ADDR_DIFF_VEC
)
2407 #if defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC)
2408 /* In this case, the case vector is being moved by the
2409 target, so don't output the label at all. Leave that
2410 to the back end macros. */
2412 if (! JUMP_TABLES_IN_TEXT_SECTION
)
2414 readonly_data_section ();
2415 #ifdef READONLY_DATA_SECTION
2416 ASM_OUTPUT_ALIGN (file
,
2417 exact_log2 (BIGGEST_ALIGNMENT
2419 #endif /* READONLY_DATA_SECTION */
2422 function_section (current_function_decl
);
2424 #ifdef ASM_OUTPUT_CASE_LABEL
2425 ASM_OUTPUT_CASE_LABEL (file
, "L", CODE_LABEL_NUMBER (insn
),
2428 if (LABEL_ALTERNATE_NAME (insn
))
2429 ASM_OUTPUT_ALTERNATE_LABEL_NAME (file
, insn
);
2431 ASM_OUTPUT_INTERNAL_LABEL (file
, "L", CODE_LABEL_NUMBER (insn
));
2437 if (LABEL_ALTERNATE_NAME (insn
))
2438 ASM_OUTPUT_ALTERNATE_LABEL_NAME (file
, insn
);
2440 ASM_OUTPUT_INTERNAL_LABEL (file
, "L", CODE_LABEL_NUMBER (insn
));
2445 register rtx body
= PATTERN (insn
);
2446 int insn_code_number
;
2447 const char *template;
2452 /* An INSN, JUMP_INSN or CALL_INSN.
2453 First check for special kinds that recog doesn't recognize. */
2455 if (GET_CODE (body
) == USE
/* These are just declarations */
2456 || GET_CODE (body
) == CLOBBER
)
2460 /* If there is a REG_CC_SETTER note on this insn, it means that
2461 the setting of the condition code was done in the delay slot
2462 of the insn that branched here. So recover the cc status
2463 from the insn that set it. */
2465 note
= find_reg_note (insn
, REG_CC_SETTER
, NULL_RTX
);
2468 NOTICE_UPDATE_CC (PATTERN (XEXP (note
, 0)), XEXP (note
, 0));
2469 cc_prev_status
= cc_status
;
2473 /* Detect insns that are really jump-tables
2474 and output them as such. */
2476 if (GET_CODE (body
) == ADDR_VEC
|| GET_CODE (body
) == ADDR_DIFF_VEC
)
2478 #if !(defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC))
2479 register int vlen
, idx
;
2487 fputs (ASM_APP_OFF
, file
);
2491 #if defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC)
2492 if (GET_CODE (body
) == ADDR_VEC
)
2494 #ifdef ASM_OUTPUT_ADDR_VEC
2495 ASM_OUTPUT_ADDR_VEC (PREV_INSN (insn
), body
);
2502 #ifdef ASM_OUTPUT_ADDR_DIFF_VEC
2503 ASM_OUTPUT_ADDR_DIFF_VEC (PREV_INSN (insn
), body
);
2509 vlen
= XVECLEN (body
, GET_CODE (body
) == ADDR_DIFF_VEC
);
2510 for (idx
= 0; idx
< vlen
; idx
++)
2512 if (GET_CODE (body
) == ADDR_VEC
)
2514 #ifdef ASM_OUTPUT_ADDR_VEC_ELT
2515 ASM_OUTPUT_ADDR_VEC_ELT
2516 (file
, CODE_LABEL_NUMBER (XEXP (XVECEXP (body
, 0, idx
), 0)));
2523 #ifdef ASM_OUTPUT_ADDR_DIFF_ELT
2524 ASM_OUTPUT_ADDR_DIFF_ELT
2527 CODE_LABEL_NUMBER (XEXP (XVECEXP (body
, 1, idx
), 0)),
2528 CODE_LABEL_NUMBER (XEXP (XEXP (body
, 0), 0)));
2534 #ifdef ASM_OUTPUT_CASE_END
2535 ASM_OUTPUT_CASE_END (file
,
2536 CODE_LABEL_NUMBER (PREV_INSN (insn
)),
2541 function_section (current_function_decl
);
2546 /* Do basic-block profiling when we reach a new block.
2547 Done here to avoid jump tables. */
2548 if (profile_block_flag
&& new_block
)
2551 if (GET_CODE (body
) == ASM_INPUT
)
2553 /* There's no telling what that did to the condition codes. */
2559 fputs (ASM_APP_ON
, file
);
2562 fprintf (asm_out_file
, "\t%s\n", XSTR (body
, 0));
2566 /* Detect `asm' construct with operands. */
2567 if (asm_noperands (body
) >= 0)
2569 unsigned int noperands
= asm_noperands (body
);
2570 rtx
*ops
= (rtx
*) alloca (noperands
* sizeof (rtx
));
2573 /* There's no telling what that did to the condition codes. */
2580 fputs (ASM_APP_ON
, file
);
2584 /* Get out the operand values. */
2585 string
= decode_asm_operands (body
, ops
, NULL_PTR
,
2586 NULL_PTR
, NULL_PTR
);
2587 /* Inhibit aborts on what would otherwise be compiler bugs. */
2588 insn_noperands
= noperands
;
2589 this_is_asm_operands
= insn
;
2591 /* Output the insn using them. */
2592 output_asm_insn (string
, ops
);
2593 this_is_asm_operands
= 0;
2597 if (prescan
<= 0 && app_on
)
2599 fputs (ASM_APP_OFF
, file
);
2603 if (GET_CODE (body
) == SEQUENCE
)
2605 /* A delayed-branch sequence */
2611 final_sequence
= body
;
2613 /* The first insn in this SEQUENCE might be a JUMP_INSN that will
2614 force the restoration of a comparison that was previously
2615 thought unnecessary. If that happens, cancel this sequence
2616 and cause that insn to be restored. */
2618 next
= final_scan_insn (XVECEXP (body
, 0, 0), file
, 0, prescan
, 1);
2619 if (next
!= XVECEXP (body
, 0, 1))
2625 for (i
= 1; i
< XVECLEN (body
, 0); i
++)
2627 rtx insn
= XVECEXP (body
, 0, i
);
2628 rtx next
= NEXT_INSN (insn
);
2629 /* We loop in case any instruction in a delay slot gets
2632 insn
= final_scan_insn (insn
, file
, 0, prescan
, 1);
2633 while (insn
!= next
);
2635 #ifdef DBR_OUTPUT_SEQEND
2636 DBR_OUTPUT_SEQEND (file
);
2640 /* If the insn requiring the delay slot was a CALL_INSN, the
2641 insns in the delay slot are actually executed before the
2642 called function. Hence we don't preserve any CC-setting
2643 actions in these insns and the CC must be marked as being
2644 clobbered by the function. */
2645 if (GET_CODE (XVECEXP (body
, 0, 0)) == CALL_INSN
)
2650 /* Following a conditional branch sequence, we have a new basic
2652 if (profile_block_flag
)
2654 rtx insn
= XVECEXP (body
, 0, 0);
2655 rtx body
= PATTERN (insn
);
2657 if ((GET_CODE (insn
) == JUMP_INSN
&& GET_CODE (body
) == SET
2658 && GET_CODE (SET_SRC (body
)) != LABEL_REF
)
2659 || (GET_CODE (insn
) == JUMP_INSN
2660 && GET_CODE (body
) == PARALLEL
2661 && GET_CODE (XVECEXP (body
, 0, 0)) == SET
2662 && GET_CODE (SET_SRC (XVECEXP (body
, 0, 0))) != LABEL_REF
))
2668 /* We have a real machine instruction as rtl. */
2670 body
= PATTERN (insn
);
2673 set
= single_set(insn
);
2675 /* Check for redundant test and compare instructions
2676 (when the condition codes are already set up as desired).
2677 This is done only when optimizing; if not optimizing,
2678 it should be possible for the user to alter a variable
2679 with the debugger in between statements
2680 and the next statement should reexamine the variable
2681 to compute the condition codes. */
2686 rtx set
= single_set(insn
);
2690 && GET_CODE (SET_DEST (set
)) == CC0
2691 && insn
!= last_ignored_compare
)
2693 if (GET_CODE (SET_SRC (set
)) == SUBREG
)
2694 SET_SRC (set
) = alter_subreg (SET_SRC (set
));
2695 else if (GET_CODE (SET_SRC (set
)) == COMPARE
)
2697 if (GET_CODE (XEXP (SET_SRC (set
), 0)) == SUBREG
)
2698 XEXP (SET_SRC (set
), 0)
2699 = alter_subreg (XEXP (SET_SRC (set
), 0));
2700 if (GET_CODE (XEXP (SET_SRC (set
), 1)) == SUBREG
)
2701 XEXP (SET_SRC (set
), 1)
2702 = alter_subreg (XEXP (SET_SRC (set
), 1));
2704 if ((cc_status
.value1
!= 0
2705 && rtx_equal_p (SET_SRC (set
), cc_status
.value1
))
2706 || (cc_status
.value2
!= 0
2707 && rtx_equal_p (SET_SRC (set
), cc_status
.value2
)))
2709 /* Don't delete insn if it has an addressing side-effect. */
2710 if (! FIND_REG_INC_NOTE (insn
, 0)
2711 /* or if anything in it is volatile. */
2712 && ! volatile_refs_p (PATTERN (insn
)))
2714 /* We don't really delete the insn; just ignore it. */
2715 last_ignored_compare
= insn
;
2723 /* Following a conditional branch, we have a new basic block.
2724 But if we are inside a sequence, the new block starts after the
2725 last insn of the sequence. */
2726 if (profile_block_flag
&& final_sequence
== 0
2727 && ((GET_CODE (insn
) == JUMP_INSN
&& GET_CODE (body
) == SET
2728 && GET_CODE (SET_SRC (body
)) != LABEL_REF
)
2729 || (GET_CODE (insn
) == JUMP_INSN
&& GET_CODE (body
) == PARALLEL
2730 && GET_CODE (XVECEXP (body
, 0, 0)) == SET
2731 && GET_CODE (SET_SRC (XVECEXP (body
, 0, 0))) != LABEL_REF
)))
2735 /* Don't bother outputting obvious no-ops, even without -O.
2736 This optimization is fast and doesn't interfere with debugging.
2737 Don't do this if the insn is in a delay slot, since this
2738 will cause an improper number of delay insns to be written. */
2739 if (final_sequence
== 0
2741 && GET_CODE (insn
) == INSN
&& GET_CODE (body
) == SET
2742 && GET_CODE (SET_SRC (body
)) == REG
2743 && GET_CODE (SET_DEST (body
)) == REG
2744 && REGNO (SET_SRC (body
)) == REGNO (SET_DEST (body
)))
2749 /* If this is a conditional branch, maybe modify it
2750 if the cc's are in a nonstandard state
2751 so that it accomplishes the same thing that it would
2752 do straightforwardly if the cc's were set up normally. */
2754 if (cc_status
.flags
!= 0
2755 && GET_CODE (insn
) == JUMP_INSN
2756 && GET_CODE (body
) == SET
2757 && SET_DEST (body
) == pc_rtx
2758 && GET_CODE (SET_SRC (body
)) == IF_THEN_ELSE
2759 && GET_RTX_CLASS (GET_CODE (XEXP (SET_SRC (body
), 0))) == '<'
2760 && XEXP (XEXP (SET_SRC (body
), 0), 0) == cc0_rtx
2761 /* This is done during prescan; it is not done again
2762 in final scan when prescan has been done. */
2765 /* This function may alter the contents of its argument
2766 and clear some of the cc_status.flags bits.
2767 It may also return 1 meaning condition now always true
2768 or -1 meaning condition now always false
2769 or 2 meaning condition nontrivial but altered. */
2770 register int result
= alter_cond (XEXP (SET_SRC (body
), 0));
2771 /* If condition now has fixed value, replace the IF_THEN_ELSE
2772 with its then-operand or its else-operand. */
2774 SET_SRC (body
) = XEXP (SET_SRC (body
), 1);
2776 SET_SRC (body
) = XEXP (SET_SRC (body
), 2);
2778 /* The jump is now either unconditional or a no-op.
2779 If it has become a no-op, don't try to output it.
2780 (It would not be recognized.) */
2781 if (SET_SRC (body
) == pc_rtx
)
2783 PUT_CODE (insn
, NOTE
);
2784 NOTE_LINE_NUMBER (insn
) = NOTE_INSN_DELETED
;
2785 NOTE_SOURCE_FILE (insn
) = 0;
2788 else if (GET_CODE (SET_SRC (body
)) == RETURN
)
2789 /* Replace (set (pc) (return)) with (return). */
2790 PATTERN (insn
) = body
= SET_SRC (body
);
2792 /* Rerecognize the instruction if it has changed. */
2794 INSN_CODE (insn
) = -1;
2797 /* Make same adjustments to instructions that examine the
2798 condition codes without jumping and instructions that
2799 handle conditional moves (if this machine has either one). */
2801 if (cc_status
.flags
!= 0
2804 rtx cond_rtx
, then_rtx
, else_rtx
;
2806 if (GET_CODE (insn
) != JUMP_INSN
2807 && GET_CODE (SET_SRC (set
)) == IF_THEN_ELSE
)
2809 cond_rtx
= XEXP (SET_SRC (set
), 0);
2810 then_rtx
= XEXP (SET_SRC (set
), 1);
2811 else_rtx
= XEXP (SET_SRC (set
), 2);
2815 cond_rtx
= SET_SRC (set
);
2816 then_rtx
= const_true_rtx
;
2817 else_rtx
= const0_rtx
;
2820 switch (GET_CODE (cond_rtx
))
2833 register int result
;
2834 if (XEXP (cond_rtx
, 0) != cc0_rtx
)
2836 result
= alter_cond (cond_rtx
);
2838 validate_change (insn
, &SET_SRC (set
), then_rtx
, 0);
2839 else if (result
== -1)
2840 validate_change (insn
, &SET_SRC (set
), else_rtx
, 0);
2841 else if (result
== 2)
2842 INSN_CODE (insn
) = -1;
2843 if (SET_DEST (set
) == SET_SRC (set
))
2845 PUT_CODE (insn
, NOTE
);
2846 NOTE_LINE_NUMBER (insn
) = NOTE_INSN_DELETED
;
2847 NOTE_SOURCE_FILE (insn
) = 0;
2859 #ifdef HAVE_peephole
2860 /* Do machine-specific peephole optimizations if desired. */
2862 if (optimize
&& !flag_no_peephole
&& !nopeepholes
)
2864 rtx next
= peephole (insn
);
2865 /* When peepholing, if there were notes within the peephole,
2866 emit them before the peephole. */
2867 if (next
!= 0 && next
!= NEXT_INSN (insn
))
2869 rtx prev
= PREV_INSN (insn
);
2872 for (note
= NEXT_INSN (insn
); note
!= next
;
2873 note
= NEXT_INSN (note
))
2874 final_scan_insn (note
, file
, optimize
, prescan
, nopeepholes
);
2876 /* In case this is prescan, put the notes
2877 in proper position for later rescan. */
2878 note
= NEXT_INSN (insn
);
2879 PREV_INSN (note
) = prev
;
2880 NEXT_INSN (prev
) = note
;
2881 NEXT_INSN (PREV_INSN (next
)) = insn
;
2882 PREV_INSN (insn
) = PREV_INSN (next
);
2883 NEXT_INSN (insn
) = next
;
2884 PREV_INSN (next
) = insn
;
2887 /* PEEPHOLE might have changed this. */
2888 body
= PATTERN (insn
);
2892 /* Try to recognize the instruction.
2893 If successful, verify that the operands satisfy the
2894 constraints for the instruction. Crash if they don't,
2895 since `reload' should have changed them so that they do. */
2897 insn_code_number
= recog_memoized (insn
);
2898 extract_insn (insn
);
2899 cleanup_subreg_operands (insn
);
2901 if (! constrain_operands (1))
2902 fatal_insn_not_found (insn
);
2904 /* Some target machines need to prescan each insn before
2907 #ifdef FINAL_PRESCAN_INSN
2908 FINAL_PRESCAN_INSN (insn
, recog_data
.operand
, recog_data
.n_operands
);
2911 #ifdef HAVE_conditional_execution
2912 if (GET_CODE (PATTERN (insn
)) == COND_EXEC
)
2913 current_insn_predicate
= COND_EXEC_TEST (PATTERN (insn
));
2915 current_insn_predicate
= NULL_RTX
;
2919 cc_prev_status
= cc_status
;
2921 /* Update `cc_status' for this instruction.
2922 The instruction's output routine may change it further.
2923 If the output routine for a jump insn needs to depend
2924 on the cc status, it should look at cc_prev_status. */
2926 NOTICE_UPDATE_CC (body
, insn
);
2929 current_output_insn
= debug_insn
= insn
;
2931 #if defined (DWARF2_UNWIND_INFO)
2932 /* If we push arguments, we want to know where the calls are. */
2933 if (!ACCUMULATE_OUTGOING_ARGS
&& GET_CODE (insn
) == CALL_INSN
2934 && dwarf2out_do_frame ())
2935 dwarf2out_frame_debug (insn
);
2938 /* Find the proper template for this insn. */
2939 template = get_insn_template (insn_code_number
, insn
);
2941 /* If the C code returns 0, it means that it is a jump insn
2942 which follows a deleted test insn, and that test insn
2943 needs to be reinserted. */
2946 if (prev_nonnote_insn (insn
) != last_ignored_compare
)
2949 return prev_nonnote_insn (insn
);
2952 /* If the template is the string "#", it means that this insn must
2954 if (template[0] == '#' && template[1] == '\0')
2956 rtx
new = try_split (body
, insn
, 0);
2958 /* If we didn't split the insn, go away. */
2959 if (new == insn
&& PATTERN (new) == body
)
2960 fatal_insn ("Could not split insn", insn
);
2962 #ifdef HAVE_ATTR_length
2963 /* This instruction should have been split in shorten_branches,
2964 to ensure that we would have valid length info for the
2976 #ifdef IA64_UNWIND_INFO
2977 IA64_UNWIND_EMIT (asm_out_file
, insn
);
2979 /* Output assembler code from the template. */
2981 output_asm_insn (template, recog_data
.operand
);
2983 #if defined (DWARF2_UNWIND_INFO)
2984 /* If we push arguments, we need to check all insns for stack
2986 if (!ACCUMULATE_OUTGOING_ARGS
)
2988 if (GET_CODE (insn
) == INSN
&& dwarf2out_do_frame ())
2989 dwarf2out_frame_debug (insn
);
2993 #if defined (HAVE_prologue)
2994 /* If this insn is part of the prologue, emit DWARF v2
2996 if (RTX_FRAME_RELATED_P (insn
) && dwarf2out_do_frame ())
2997 dwarf2out_frame_debug (insn
);
3003 /* It's not at all clear why we did this and doing so interferes
3004 with tests we'd like to do to use REG_WAS_0 notes, so let's try
3007 /* Mark this insn as having been output. */
3008 INSN_DELETED_P (insn
) = 1;
3011 current_output_insn
= debug_insn
= 0;
3014 return NEXT_INSN (insn
);
3017 /* Output debugging info to the assembler file FILE
3018 based on the NOTE-insn INSN, assumed to be a line number. */
3021 output_source_line (file
, insn
)
3022 FILE *file ATTRIBUTE_UNUSED
;
3025 register const char *filename
= NOTE_SOURCE_FILE (insn
);
3027 /* Remember filename for basic block profiling.
3028 Filenames are allocated on the permanent obstack
3029 or are passed in ARGV, so we don't have to save
3032 if (profile_block_flag
&& last_filename
!= filename
)
3033 bb_file_label_num
= add_bb_string (filename
, TRUE
);
3035 last_filename
= filename
;
3036 last_linenum
= NOTE_LINE_NUMBER (insn
);
3037 high_block_linenum
= MAX (last_linenum
, high_block_linenum
);
3038 high_function_linenum
= MAX (last_linenum
, high_function_linenum
);
3040 if (write_symbols
!= NO_DEBUG
)
3042 #ifdef SDB_DEBUGGING_INFO
3043 if (write_symbols
== SDB_DEBUG
3044 #if 0 /* People like having line numbers even in wrong file! */
3045 /* COFF can't handle multiple source files--lose, lose. */
3046 && !strcmp (filename
, main_input_filename
)
3048 /* COFF relative line numbers must be positive. */
3049 && last_linenum
> sdb_begin_function_line
)
3051 #ifdef ASM_OUTPUT_SOURCE_LINE
3052 ASM_OUTPUT_SOURCE_LINE (file
, last_linenum
);
3054 fprintf (file
, "\t.ln\t%d\n",
3055 ((sdb_begin_function_line
> -1)
3056 ? last_linenum
- sdb_begin_function_line
: 1));
3061 #if defined (DBX_DEBUGGING_INFO)
3062 if (write_symbols
== DBX_DEBUG
)
3063 dbxout_source_line (file
, filename
, NOTE_LINE_NUMBER (insn
));
3066 #if defined (XCOFF_DEBUGGING_INFO)
3067 if (write_symbols
== XCOFF_DEBUG
)
3068 xcoffout_source_line (file
, filename
, insn
);
3071 #ifdef DWARF_DEBUGGING_INFO
3072 if (write_symbols
== DWARF_DEBUG
)
3073 dwarfout_line (filename
, NOTE_LINE_NUMBER (insn
));
3076 #ifdef DWARF2_DEBUGGING_INFO
3077 if (write_symbols
== DWARF2_DEBUG
)
3078 dwarf2out_line (filename
, NOTE_LINE_NUMBER (insn
));
3084 /* For each operand in INSN, simplify (subreg (reg)) so that it refers
3085 directly to the desired hard register. */
3087 cleanup_subreg_operands (insn
)
3092 extract_insn (insn
);
3093 for (i
= 0; i
< recog_data
.n_operands
; i
++)
3095 if (GET_CODE (recog_data
.operand
[i
]) == SUBREG
)
3096 recog_data
.operand
[i
] = alter_subreg (recog_data
.operand
[i
]);
3097 else if (GET_CODE (recog_data
.operand
[i
]) == PLUS
3098 || GET_CODE (recog_data
.operand
[i
]) == MULT
)
3099 recog_data
.operand
[i
] = walk_alter_subreg (recog_data
.operand
[i
]);
3102 for (i
= 0; i
< recog_data
.n_dups
; i
++)
3104 if (GET_CODE (*recog_data
.dup_loc
[i
]) == SUBREG
)
3105 *recog_data
.dup_loc
[i
] = alter_subreg (*recog_data
.dup_loc
[i
]);
3106 else if (GET_CODE (*recog_data
.dup_loc
[i
]) == PLUS
3107 || GET_CODE (*recog_data
.dup_loc
[i
]) == MULT
)
3108 *recog_data
.dup_loc
[i
] = walk_alter_subreg (*recog_data
.dup_loc
[i
]);
3112 /* If X is a SUBREG, replace it with a REG or a MEM,
3113 based on the thing it is a subreg of. */
3119 register rtx y
= SUBREG_REG (x
);
3121 if (GET_CODE (y
) == SUBREG
)
3122 y
= alter_subreg (y
);
3124 /* If reload is operating, we may be replacing inside this SUBREG.
3125 Check for that and make a new one if so. */
3126 if (reload_in_progress
&& find_replacement (&SUBREG_REG (x
)) != 0)
3129 if (GET_CODE (y
) == REG
)
3132 /* If the word size is larger than the size of this register,
3133 adjust the register number to compensate. */
3134 /* ??? Note that this just catches stragglers created by/for
3135 integrate. It would be better if we either caught these
3136 earlier, or kept _all_ subregs until now and eliminate
3137 gen_lowpart and friends. */
3139 #ifdef ALTER_HARD_SUBREG
3140 regno
= ALTER_HARD_SUBREG(GET_MODE (x
), SUBREG_WORD (x
),
3141 GET_MODE (y
), REGNO (y
));
3143 regno
= REGNO (y
) + SUBREG_WORD (x
);
3147 /* This field has a different meaning for REGs and SUBREGs. Make sure
3151 else if (GET_CODE (y
) == MEM
)
3153 register int offset
= SUBREG_WORD (x
) * UNITS_PER_WORD
;
3155 if (BYTES_BIG_ENDIAN
)
3156 offset
-= (MIN (UNITS_PER_WORD
, GET_MODE_SIZE (GET_MODE (x
)))
3157 - MIN (UNITS_PER_WORD
, GET_MODE_SIZE (GET_MODE (y
))));
3159 MEM_COPY_ATTRIBUTES (x
, y
);
3160 XEXP (x
, 0) = plus_constant (XEXP (y
, 0), offset
);
3166 /* Do alter_subreg on all the SUBREGs contained in X. */
3169 walk_alter_subreg (x
)
3172 switch (GET_CODE (x
))
3176 XEXP (x
, 0) = walk_alter_subreg (XEXP (x
, 0));
3177 XEXP (x
, 1) = walk_alter_subreg (XEXP (x
, 1));
3181 XEXP (x
, 0) = walk_alter_subreg (XEXP (x
, 0));
3185 return alter_subreg (x
);
3196 /* Given BODY, the body of a jump instruction, alter the jump condition
3197 as required by the bits that are set in cc_status.flags.
3198 Not all of the bits there can be handled at this level in all cases.
3200 The value is normally 0.
3201 1 means that the condition has become always true.
3202 -1 means that the condition has become always false.
3203 2 means that COND has been altered. */
3211 if (cc_status
.flags
& CC_REVERSED
)
3214 PUT_CODE (cond
, swap_condition (GET_CODE (cond
)));
3217 if (cc_status
.flags
& CC_INVERTED
)
3220 PUT_CODE (cond
, reverse_condition (GET_CODE (cond
)));
3223 if (cc_status
.flags
& CC_NOT_POSITIVE
)
3224 switch (GET_CODE (cond
))
3229 /* Jump becomes unconditional. */
3235 /* Jump becomes no-op. */
3239 PUT_CODE (cond
, EQ
);
3244 PUT_CODE (cond
, NE
);
3252 if (cc_status
.flags
& CC_NOT_NEGATIVE
)
3253 switch (GET_CODE (cond
))
3257 /* Jump becomes unconditional. */
3262 /* Jump becomes no-op. */
3267 PUT_CODE (cond
, EQ
);
3273 PUT_CODE (cond
, NE
);
3281 if (cc_status
.flags
& CC_NO_OVERFLOW
)
3282 switch (GET_CODE (cond
))
3285 /* Jump becomes unconditional. */
3289 PUT_CODE (cond
, EQ
);
3294 PUT_CODE (cond
, NE
);
3299 /* Jump becomes no-op. */
3306 if (cc_status
.flags
& (CC_Z_IN_NOT_N
| CC_Z_IN_N
))
3307 switch (GET_CODE (cond
))
3313 PUT_CODE (cond
, cc_status
.flags
& CC_Z_IN_N
? GE
: LT
);
3318 PUT_CODE (cond
, cc_status
.flags
& CC_Z_IN_N
? LT
: GE
);
3323 if (cc_status
.flags
& CC_NOT_SIGNED
)
3324 /* The flags are valid if signed condition operators are converted
3326 switch (GET_CODE (cond
))
3329 PUT_CODE (cond
, LEU
);
3334 PUT_CODE (cond
, LTU
);
3339 PUT_CODE (cond
, GTU
);
3344 PUT_CODE (cond
, GEU
);
3356 /* Report inconsistency between the assembler template and the operands.
3357 In an `asm', it's the user's fault; otherwise, the compiler's fault. */
3360 output_operand_lossage (msgid
)
3363 if (this_is_asm_operands
)
3364 error_for_asm (this_is_asm_operands
, "invalid `asm': %s", _(msgid
));
3367 error ("output_operand: %s", _(msgid
));
3372 /* Output of assembler code from a template, and its subroutines. */
3374 /* Output text from TEMPLATE to the assembler output file,
3375 obeying %-directions to substitute operands taken from
3376 the vector OPERANDS.
3378 %N (for N a digit) means print operand N in usual manner.
3379 %lN means require operand N to be a CODE_LABEL or LABEL_REF
3380 and print the label name with no punctuation.
3381 %cN means require operand N to be a constant
3382 and print the constant expression with no punctuation.
3383 %aN means expect operand N to be a memory address
3384 (not a memory reference!) and print a reference
3386 %nN means expect operand N to be a constant
3387 and print a constant expression for minus the value
3388 of the operand, with no other punctuation. */
3393 if (flag_print_asm_name
)
3395 /* Annotate the assembly with a comment describing the pattern and
3396 alternative used. */
3399 register int num
= INSN_CODE (debug_insn
);
3400 fprintf (asm_out_file
, "\t%s %d\t%s",
3401 ASM_COMMENT_START
, INSN_UID (debug_insn
),
3402 insn_data
[num
].name
);
3403 if (insn_data
[num
].n_alternatives
> 1)
3404 fprintf (asm_out_file
, "/%d", which_alternative
+ 1);
3405 #ifdef HAVE_ATTR_length
3406 fprintf (asm_out_file
, "\t[length = %d]",
3407 get_attr_length (debug_insn
));
3409 /* Clear this so only the first assembler insn
3410 of any rtl insn will get the special comment for -dp. */
3417 output_asm_insn (template, operands
)
3418 const char *template;
3421 register const char *p
;
3424 /* An insn may return a null string template
3425 in a case where no assembler code is needed. */
3430 putc ('\t', asm_out_file
);
3432 #ifdef ASM_OUTPUT_OPCODE
3433 ASM_OUTPUT_OPCODE (asm_out_file
, p
);
3441 putc (c
, asm_out_file
);
3442 #ifdef ASM_OUTPUT_OPCODE
3443 while ((c
= *p
) == '\t')
3445 putc (c
, asm_out_file
);
3448 ASM_OUTPUT_OPCODE (asm_out_file
, p
);
3452 #ifdef ASSEMBLER_DIALECT
3457 /* If we want the first dialect, do nothing. Otherwise, skip
3458 DIALECT_NUMBER of strings ending with '|'. */
3459 for (i
= 0; i
< dialect_number
; i
++)
3461 while (*p
&& *p
!= '}' && *p
++ != '|')
3472 /* Skip to close brace. */
3473 while (*p
&& *p
++ != '}')
3482 /* %% outputs a single %. */
3486 putc (c
, asm_out_file
);
3488 /* %= outputs a number which is unique to each insn in the entire
3489 compilation. This is useful for making local labels that are
3490 referred to more than once in a given insn. */
3494 fprintf (asm_out_file
, "%d", insn_counter
);
3496 /* % followed by a letter and some digits
3497 outputs an operand in a special way depending on the letter.
3498 Letters `acln' are implemented directly.
3499 Other letters are passed to `output_operand' so that
3500 the PRINT_OPERAND macro can define them. */
3501 else if (ISLOWER(*p
) || ISUPPER(*p
))
3506 if (! (*p
>= '0' && *p
<= '9'))
3507 output_operand_lossage ("operand number missing after %-letter");
3508 else if (this_is_asm_operands
&& (c
< 0 || (unsigned int) c
>= insn_noperands
))
3509 output_operand_lossage ("operand number out of range");
3510 else if (letter
== 'l')
3511 output_asm_label (operands
[c
]);
3512 else if (letter
== 'a')
3513 output_address (operands
[c
]);
3514 else if (letter
== 'c')
3516 if (CONSTANT_ADDRESS_P (operands
[c
]))
3517 output_addr_const (asm_out_file
, operands
[c
]);
3519 output_operand (operands
[c
], 'c');
3521 else if (letter
== 'n')
3523 if (GET_CODE (operands
[c
]) == CONST_INT
)
3524 fprintf (asm_out_file
, HOST_WIDE_INT_PRINT_DEC
,
3525 - INTVAL (operands
[c
]));
3528 putc ('-', asm_out_file
);
3529 output_addr_const (asm_out_file
, operands
[c
]);
3533 output_operand (operands
[c
], letter
);
3535 while ((c
= *p
) >= '0' && c
<= '9') p
++;
3537 /* % followed by a digit outputs an operand the default way. */
3538 else if (*p
>= '0' && *p
<= '9')
3541 if (this_is_asm_operands
&& (c
< 0 || (unsigned int) c
>= insn_noperands
))
3542 output_operand_lossage ("operand number out of range");
3544 output_operand (operands
[c
], 0);
3545 while ((c
= *p
) >= '0' && c
<= '9') p
++;
3547 /* % followed by punctuation: output something for that
3548 punctuation character alone, with no operand.
3549 The PRINT_OPERAND macro decides what is actually done. */
3550 #ifdef PRINT_OPERAND_PUNCT_VALID_P
3551 else if (PRINT_OPERAND_PUNCT_VALID_P ((unsigned char)*p
))
3552 output_operand (NULL_RTX
, *p
++);
3555 output_operand_lossage ("invalid %%-code");
3559 putc (c
, asm_out_file
);
3564 putc ('\n', asm_out_file
);
3567 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
3570 output_asm_label (x
)
3575 if (GET_CODE (x
) == LABEL_REF
)
3577 if (GET_CODE (x
) == CODE_LABEL
3578 || (GET_CODE (x
) == NOTE
3579 && NOTE_LINE_NUMBER (x
) == NOTE_INSN_DELETED_LABEL
))
3580 ASM_GENERATE_INTERNAL_LABEL (buf
, "L", CODE_LABEL_NUMBER (x
));
3582 output_operand_lossage ("`%l' operand isn't a label");
3584 assemble_name (asm_out_file
, buf
);
3587 /* Print operand X using machine-dependent assembler syntax.
3588 The macro PRINT_OPERAND is defined just to control this function.
3589 CODE is a non-digit that preceded the operand-number in the % spec,
3590 such as 'z' if the spec was `%z3'. CODE is 0 if there was no char
3591 between the % and the digits.
3592 When CODE is a non-letter, X is 0.
3594 The meanings of the letters are machine-dependent and controlled
3595 by PRINT_OPERAND. */
3598 output_operand (x
, code
)
3600 int code ATTRIBUTE_UNUSED
;
3602 if (x
&& GET_CODE (x
) == SUBREG
)
3603 x
= alter_subreg (x
);
3605 /* If X is a pseudo-register, abort now rather than writing trash to the
3608 if (x
&& GET_CODE (x
) == REG
&& REGNO (x
) >= FIRST_PSEUDO_REGISTER
)
3611 PRINT_OPERAND (asm_out_file
, x
, code
);
3614 /* Print a memory reference operand for address X
3615 using machine-dependent assembler syntax.
3616 The macro PRINT_OPERAND_ADDRESS exists just to control this function. */
3622 walk_alter_subreg (x
);
3623 PRINT_OPERAND_ADDRESS (asm_out_file
, x
);
3626 /* Print an integer constant expression in assembler syntax.
3627 Addition and subtraction are the only arithmetic
3628 that may appear in these expressions. */
3631 output_addr_const (file
, x
)
3638 switch (GET_CODE (x
))
3648 assemble_name (file
, XSTR (x
, 0));
3652 ASM_GENERATE_INTERNAL_LABEL (buf
, "L", CODE_LABEL_NUMBER (XEXP (x
, 0)));
3653 assemble_name (file
, buf
);
3657 ASM_GENERATE_INTERNAL_LABEL (buf
, "L", CODE_LABEL_NUMBER (x
));
3658 assemble_name (file
, buf
);
3662 fprintf (file
, HOST_WIDE_INT_PRINT_DEC
, INTVAL (x
));
3666 /* This used to output parentheses around the expression,
3667 but that does not work on the 386 (either ATT or BSD assembler). */
3668 output_addr_const (file
, XEXP (x
, 0));
3672 if (GET_MODE (x
) == VOIDmode
)
3674 /* We can use %d if the number is one word and positive. */
3675 if (CONST_DOUBLE_HIGH (x
))
3676 fprintf (file
, HOST_WIDE_INT_PRINT_DOUBLE_HEX
,
3677 CONST_DOUBLE_HIGH (x
), CONST_DOUBLE_LOW (x
));
3678 else if (CONST_DOUBLE_LOW (x
) < 0)
3679 fprintf (file
, HOST_WIDE_INT_PRINT_HEX
, CONST_DOUBLE_LOW (x
));
3681 fprintf (file
, HOST_WIDE_INT_PRINT_DEC
, CONST_DOUBLE_LOW (x
));
3684 /* We can't handle floating point constants;
3685 PRINT_OPERAND must handle them. */
3686 output_operand_lossage ("floating constant misused");
3690 /* Some assemblers need integer constants to appear last (eg masm). */
3691 if (GET_CODE (XEXP (x
, 0)) == CONST_INT
)
3693 output_addr_const (file
, XEXP (x
, 1));
3694 if (INTVAL (XEXP (x
, 0)) >= 0)
3695 fprintf (file
, "+");
3696 output_addr_const (file
, XEXP (x
, 0));
3700 output_addr_const (file
, XEXP (x
, 0));
3701 if (INTVAL (XEXP (x
, 1)) >= 0)
3702 fprintf (file
, "+");
3703 output_addr_const (file
, XEXP (x
, 1));
3708 /* Avoid outputting things like x-x or x+5-x,
3709 since some assemblers can't handle that. */
3710 x
= simplify_subtraction (x
);
3711 if (GET_CODE (x
) != MINUS
)
3714 output_addr_const (file
, XEXP (x
, 0));
3715 fprintf (file
, "-");
3716 if (GET_CODE (XEXP (x
, 1)) == CONST_INT
3717 && INTVAL (XEXP (x
, 1)) < 0)
3719 fprintf (file
, "%s", ASM_OPEN_PAREN
);
3720 output_addr_const (file
, XEXP (x
, 1));
3721 fprintf (file
, "%s", ASM_CLOSE_PAREN
);
3724 output_addr_const (file
, XEXP (x
, 1));
3729 output_addr_const (file
, XEXP (x
, 0));
3733 output_operand_lossage ("invalid expression as operand");
3737 /* A poor man's fprintf, with the added features of %I, %R, %L, and %U.
3738 %R prints the value of REGISTER_PREFIX.
3739 %L prints the value of LOCAL_LABEL_PREFIX.
3740 %U prints the value of USER_LABEL_PREFIX.
3741 %I prints the value of IMMEDIATE_PREFIX.
3742 %O runs ASM_OUTPUT_OPCODE to transform what follows in the string.
3743 Also supported are %d, %x, %s, %e, %f, %g and %%.
3745 We handle alternate assembler dialects here, just like output_asm_insn. */
3748 asm_fprintf
VPARAMS ((FILE *file
, const char *p
, ...))
3750 #ifndef ANSI_PROTOTYPES
3758 VA_START (argptr
, p
);
3760 #ifndef ANSI_PROTOTYPES
3761 file
= va_arg (argptr
, FILE *);
3762 p
= va_arg (argptr
, const char *);
3770 #ifdef ASSEMBLER_DIALECT
3775 /* If we want the first dialect, do nothing. Otherwise, skip
3776 DIALECT_NUMBER of strings ending with '|'. */
3777 for (i
= 0; i
< dialect_number
; i
++)
3779 while (*p
&& *p
++ != '|')
3789 /* Skip to close brace. */
3790 while (*p
&& *p
++ != '}')
3801 while ((c
>= '0' && c
<= '9') || c
== '.')
3809 fprintf (file
, "%%");
3812 case 'd': case 'i': case 'u':
3813 case 'x': case 'p': case 'X':
3817 fprintf (file
, buf
, va_arg (argptr
, int));
3821 /* This is a prefix to the 'd', 'i', 'u', 'x', 'p', and 'X' cases,
3822 but we do not check for those cases. It means that the value
3823 is a HOST_WIDE_INT, which may be either `int' or `long'. */
3825 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
3827 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
3837 fprintf (file
, buf
, va_arg (argptr
, HOST_WIDE_INT
));
3844 fprintf (file
, buf
, va_arg (argptr
, long));
3852 fprintf (file
, buf
, va_arg (argptr
, double));
3858 fprintf (file
, buf
, va_arg (argptr
, char *));
3862 #ifdef ASM_OUTPUT_OPCODE
3863 ASM_OUTPUT_OPCODE (asm_out_file
, p
);
3868 #ifdef REGISTER_PREFIX
3869 fprintf (file
, "%s", REGISTER_PREFIX
);
3874 #ifdef IMMEDIATE_PREFIX
3875 fprintf (file
, "%s", IMMEDIATE_PREFIX
);
3880 #ifdef LOCAL_LABEL_PREFIX
3881 fprintf (file
, "%s", LOCAL_LABEL_PREFIX
);
3886 fputs (user_label_prefix
, file
);
3889 #ifdef ASM_FPRINTF_EXTENSIONS
3890 /* Upper case letters are reserved for general use by asm_fprintf
3891 and so are not available to target specific code. In order to
3892 prevent the ASM_FPRINTF_EXTENSIONS macro from using them then,
3893 they are defined here. As they get turned into real extensions
3894 to asm_fprintf they should be removed from this list. */
3895 case 'A': case 'B': case 'C': case 'D': case 'E':
3896 case 'F': case 'G': case 'H': case 'J': case 'K':
3897 case 'M': case 'N': case 'P': case 'Q': case 'S':
3898 case 'T': case 'V': case 'W': case 'Y': case 'Z':
3901 ASM_FPRINTF_EXTENSIONS (file
, argptr
, p
)
3914 /* Split up a CONST_DOUBLE or integer constant rtx
3915 into two rtx's for single words,
3916 storing in *FIRST the word that comes first in memory in the target
3917 and in *SECOND the other. */
3920 split_double (value
, first
, second
)
3922 rtx
*first
, *second
;
3924 if (GET_CODE (value
) == CONST_INT
)
3926 if (HOST_BITS_PER_WIDE_INT
>= (2 * BITS_PER_WORD
))
3928 /* In this case the CONST_INT holds both target words.
3929 Extract the bits from it into two word-sized pieces.
3930 Sign extend each half to HOST_WIDE_INT. */
3931 unsigned HOST_WIDE_INT low
, high
;
3932 unsigned HOST_WIDE_INT mask
, sign_bit
, sign_extend
;
3934 /* Set sign_bit to the most significant bit of a word. */
3936 sign_bit
<<= BITS_PER_WORD
- 1;
3938 /* Set mask so that all bits of the word are set. We could
3939 have used 1 << BITS_PER_WORD instead of basing the
3940 calculation on sign_bit. However, on machines where
3941 HOST_BITS_PER_WIDE_INT == BITS_PER_WORD, it could cause a
3942 compiler warning, even though the code would never be
3944 mask
= sign_bit
<< 1;
3947 /* Set sign_extend as any remaining bits. */
3948 sign_extend
= ~mask
;
3950 /* Pick the lower word and sign-extend it. */
3951 low
= INTVAL (value
);
3956 /* Pick the higher word, shifted to the least significant
3957 bits, and sign-extend it. */
3958 high
= INTVAL (value
);
3959 high
>>= BITS_PER_WORD
- 1;
3962 if (high
& sign_bit
)
3963 high
|= sign_extend
;
3965 /* Store the words in the target machine order. */
3966 if (WORDS_BIG_ENDIAN
)
3968 *first
= GEN_INT (high
);
3969 *second
= GEN_INT (low
);
3973 *first
= GEN_INT (low
);
3974 *second
= GEN_INT (high
);
3979 /* The rule for using CONST_INT for a wider mode
3980 is that we regard the value as signed.
3981 So sign-extend it. */
3982 rtx high
= (INTVAL (value
) < 0 ? constm1_rtx
: const0_rtx
);
3983 if (WORDS_BIG_ENDIAN
)
3995 else if (GET_CODE (value
) != CONST_DOUBLE
)
3997 if (WORDS_BIG_ENDIAN
)
3999 *first
= const0_rtx
;
4005 *second
= const0_rtx
;
4008 else if (GET_MODE (value
) == VOIDmode
4009 /* This is the old way we did CONST_DOUBLE integers. */
4010 || GET_MODE_CLASS (GET_MODE (value
)) == MODE_INT
)
4012 /* In an integer, the words are defined as most and least significant.
4013 So order them by the target's convention. */
4014 if (WORDS_BIG_ENDIAN
)
4016 *first
= GEN_INT (CONST_DOUBLE_HIGH (value
));
4017 *second
= GEN_INT (CONST_DOUBLE_LOW (value
));
4021 *first
= GEN_INT (CONST_DOUBLE_LOW (value
));
4022 *second
= GEN_INT (CONST_DOUBLE_HIGH (value
));
4027 #ifdef REAL_ARITHMETIC
4028 REAL_VALUE_TYPE r
; long l
[2];
4029 REAL_VALUE_FROM_CONST_DOUBLE (r
, value
);
4031 /* Note, this converts the REAL_VALUE_TYPE to the target's
4032 format, splits up the floating point double and outputs
4033 exactly 32 bits of it into each of l[0] and l[1] --
4034 not necessarily BITS_PER_WORD bits. */
4035 REAL_VALUE_TO_TARGET_DOUBLE (r
, l
);
4037 /* If 32 bits is an entire word for the target, but not for the host,
4038 then sign-extend on the host so that the number will look the same
4039 way on the host that it would on the target. See for instance
4040 simplify_unary_operation. The #if is needed to avoid compiler
4043 #if HOST_BITS_PER_LONG > 32
4044 if (BITS_PER_WORD
< HOST_BITS_PER_LONG
&& BITS_PER_WORD
== 32)
4046 if (l
[0] & ((long) 1 << 31))
4047 l
[0] |= ((long) (-1) << 32);
4048 if (l
[1] & ((long) 1 << 31))
4049 l
[1] |= ((long) (-1) << 32);
4053 *first
= GEN_INT ((HOST_WIDE_INT
) l
[0]);
4054 *second
= GEN_INT ((HOST_WIDE_INT
) l
[1]);
4056 if ((HOST_FLOAT_FORMAT
!= TARGET_FLOAT_FORMAT
4057 || HOST_BITS_PER_WIDE_INT
!= BITS_PER_WORD
)
4058 && ! flag_pretend_float
)
4062 #ifdef HOST_WORDS_BIG_ENDIAN
4069 /* Host and target agree => no need to swap. */
4070 *first
= GEN_INT (CONST_DOUBLE_LOW (value
));
4071 *second
= GEN_INT (CONST_DOUBLE_HIGH (value
));
4075 *second
= GEN_INT (CONST_DOUBLE_LOW (value
));
4076 *first
= GEN_INT (CONST_DOUBLE_HIGH (value
));
4078 #endif /* no REAL_ARITHMETIC */
4082 /* Return nonzero if this function has no function calls. */
4089 if (profile_flag
|| profile_block_flag
|| profile_arc_flag
)
4092 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4094 if (GET_CODE (insn
) == CALL_INSN
4095 && ! SIBLING_CALL_P (insn
))
4097 if (GET_CODE (insn
) == INSN
4098 && GET_CODE (PATTERN (insn
)) == SEQUENCE
4099 && GET_CODE (XVECEXP (PATTERN (insn
), 0, 0)) == CALL_INSN
4100 && ! SIBLING_CALL_P (XVECEXP (PATTERN (insn
), 0, 0)))
4103 for (insn
= current_function_epilogue_delay_list
; insn
; insn
= XEXP (insn
, 1))
4105 if (GET_CODE (XEXP (insn
, 0)) == CALL_INSN
4106 && ! SIBLING_CALL_P (insn
))
4108 if (GET_CODE (XEXP (insn
, 0)) == INSN
4109 && GET_CODE (PATTERN (XEXP (insn
, 0))) == SEQUENCE
4110 && GET_CODE (XVECEXP (PATTERN (XEXP (insn
, 0)), 0, 0)) == CALL_INSN
4111 && ! SIBLING_CALL_P (XVECEXP (PATTERN (XEXP (insn
, 0)), 0, 0)))
4118 /* On some machines, a function with no call insns
4119 can run faster if it doesn't create its own register window.
4120 When output, the leaf function should use only the "output"
4121 registers. Ordinarily, the function would be compiled to use
4122 the "input" registers to find its arguments; it is a candidate
4123 for leaf treatment if it uses only the "input" registers.
4124 Leaf function treatment means renumbering so the function
4125 uses the "output" registers instead. */
4127 #ifdef LEAF_REGISTERS
4129 /* Return 1 if this function uses only the registers that can be
4130 safely renumbered. */
4133 only_leaf_regs_used ()
4136 char *permitted_reg_in_leaf_functions
= LEAF_REGISTERS
;
4138 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
4139 if ((regs_ever_live
[i
] || global_regs
[i
])
4140 && ! permitted_reg_in_leaf_functions
[i
])
4143 if (current_function_uses_pic_offset_table
4144 && pic_offset_table_rtx
!= 0
4145 && GET_CODE (pic_offset_table_rtx
) == REG
4146 && ! permitted_reg_in_leaf_functions
[REGNO (pic_offset_table_rtx
)])
4152 /* Scan all instructions and renumber all registers into those
4153 available in leaf functions. */
4156 leaf_renumber_regs (first
)
4161 /* Renumber only the actual patterns.
4162 The reg-notes can contain frame pointer refs,
4163 and renumbering them could crash, and should not be needed. */
4164 for (insn
= first
; insn
; insn
= NEXT_INSN (insn
))
4165 if (GET_RTX_CLASS (GET_CODE (insn
)) == 'i')
4166 leaf_renumber_regs_insn (PATTERN (insn
));
4167 for (insn
= current_function_epilogue_delay_list
; insn
; insn
= XEXP (insn
, 1))
4168 if (GET_RTX_CLASS (GET_CODE (XEXP (insn
, 0))) == 'i')
4169 leaf_renumber_regs_insn (PATTERN (XEXP (insn
, 0)));
4172 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
4173 available in leaf functions. */
4176 leaf_renumber_regs_insn (in_rtx
)
4177 register rtx in_rtx
;
4180 register const char *format_ptr
;
4185 /* Renumber all input-registers into output-registers.
4186 renumbered_regs would be 1 for an output-register;
4189 if (GET_CODE (in_rtx
) == REG
)
4193 /* Don't renumber the same reg twice. */
4197 newreg
= REGNO (in_rtx
);
4198 /* Don't try to renumber pseudo regs. It is possible for a pseudo reg
4199 to reach here as part of a REG_NOTE. */
4200 if (newreg
>= FIRST_PSEUDO_REGISTER
)
4205 newreg
= LEAF_REG_REMAP (newreg
);
4208 regs_ever_live
[REGNO (in_rtx
)] = 0;
4209 regs_ever_live
[newreg
] = 1;
4210 REGNO (in_rtx
) = newreg
;
4214 if (GET_RTX_CLASS (GET_CODE (in_rtx
)) == 'i')
4216 /* Inside a SEQUENCE, we find insns.
4217 Renumber just the patterns of these insns,
4218 just as we do for the top-level insns. */
4219 leaf_renumber_regs_insn (PATTERN (in_rtx
));
4223 format_ptr
= GET_RTX_FORMAT (GET_CODE (in_rtx
));
4225 for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (in_rtx
)); i
++)
4226 switch (*format_ptr
++)
4229 leaf_renumber_regs_insn (XEXP (in_rtx
, i
));
4233 if (NULL
!= XVEC (in_rtx
, i
))
4235 for (j
= 0; j
< XVECLEN (in_rtx
, i
); j
++)
4236 leaf_renumber_regs_insn (XVECEXP (in_rtx
, i
, j
));