1 /* RTL utility routines.
2 Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
30 /* Calculate the format for CONST_DOUBLE. This depends on the relative
31 widths of HOST_WIDE_INT and REAL_VALUE_TYPE.
33 We need to go out to 0wwwww, since real.c assumes 16 bits per element
36 This is duplicated in gengenrtl.c.
38 A number of places assume that there are always at least two 'w'
39 slots in a CONST_DOUBLE, so we provide them even if one would suffice. */
41 #if MAX_LONG_DOUBLE_TYPE_SIZE == 96
43 (11*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
45 # if MAX_LONG_DOUBLE_TYPE_SIZE == 128
47 (19*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
49 # if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
51 (7*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
57 # if HOST_BITS_PER_WIDE_INT*2 >= MAX_LONG_DOUBLE_TYPE_SIZE
60 # if HOST_BITS_PER_WIDE_INT*3 >= MAX_LONG_DOUBLE_TYPE_SIZE
63 # if HOST_BITS_PER_WIDE_INT*4 >= MAX_LONG_DOUBLE_TYPE_SIZE
68 #endif /* REAL_WIDTH */
71 # define CONST_DOUBLE_FORMAT "0ww"
74 # define CONST_DOUBLE_FORMAT "0ww"
77 # define CONST_DOUBLE_FORMAT "0www"
80 # define CONST_DOUBLE_FORMAT "0wwww"
83 # define CONST_DOUBLE_FORMAT "0wwwww"
85 # define CONST_DOUBLE_FORMAT /* nothing - will cause syntax error */
92 /* Indexed by rtx code, gives number of operands for an rtx with that code.
93 Does NOT include rtx header data (code and links). */
95 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) sizeof FORMAT - 1 ,
97 const unsigned char rtx_length[NUM_RTX_CODE] = {
103 /* Indexed by rtx code, gives the name of that kind of rtx, as a C string. */
105 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) NAME ,
107 const char * const rtx_name[NUM_RTX_CODE] = {
108 #include "rtl.def" /* rtl expressions are documented here */
113 /* Indexed by machine mode, gives the name of that machine mode.
114 This name does not include the letters "mode". */
116 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) NAME,
118 const char * const mode_name[NUM_MACHINE_MODES] = {
119 #include "machmode.def"
124 /* Indexed by machine mode, gives the class mode for GET_MODE_CLASS. */
126 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) CLASS,
128 const enum mode_class mode_class[NUM_MACHINE_MODES] = {
129 #include "machmode.def"
134 /* Indexed by machine mode, gives the length of the mode, in bits.
135 GET_MODE_BITSIZE uses this. */
137 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) BITSIZE,
139 const unsigned short mode_bitsize[NUM_MACHINE_MODES] = {
140 #include "machmode.def"
145 /* Indexed by machine mode, gives the length of the mode, in bytes.
146 GET_MODE_SIZE uses this. */
148 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) SIZE,
150 const unsigned char mode_size[NUM_MACHINE_MODES] = {
151 #include "machmode.def"
156 /* Indexed by machine mode, gives the length of the mode's subunit.
157 GET_MODE_UNIT_SIZE uses this. */
159 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) UNIT,
161 const unsigned char mode_unit_size[NUM_MACHINE_MODES] = {
162 #include "machmode.def" /* machine modes are documented here */
167 /* Indexed by machine mode, gives next wider natural mode
168 (QI -> HI -> SI -> DI, etc.) Widening multiply instructions
171 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) \
172 (unsigned char) WIDER,
174 const unsigned char mode_wider_mode[NUM_MACHINE_MODES] = {
175 #include "machmode.def" /* machine modes are documented here */
180 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) \
181 ((BITSIZE) >= HOST_BITS_PER_WIDE_INT) ? ~(unsigned HOST_WIDE_INT) 0 : ((unsigned HOST_WIDE_INT) 1 << (BITSIZE)) - 1,
183 /* Indexed by machine mode, gives mask of significant bits in mode. */
185 const unsigned HOST_WIDE_INT mode_mask_array[NUM_MACHINE_MODES] = {
186 #include "machmode.def"
191 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) INNER,
193 /* Indexed by machine mode, gives the mode of the inner elements in a
196 const enum machine_mode inner_mode_array[NUM_MACHINE_MODES] = {
197 #include "machmode.def"
200 /* Indexed by mode class, gives the narrowest mode for each class.
201 The Q modes are always of width 1 (2 for complex) - it is impossible
202 for any mode to be narrower.
204 Note that we use QImode instead of BImode for MODE_INT, since
205 otherwise the middle end will try to use it for bitfields in
206 structures and the like, which we do not want. Only the target
207 md file should generate BImode widgets. */
209 const enum machine_mode class_narrowest_mode[(int) MAX_MODE_CLASS] = {
210 /* MODE_RANDOM */ VOIDmode,
211 /* MODE_INT */ QImode,
212 /* MODE_FLOAT */ QFmode,
213 /* MODE_PARTIAL_INT */ PQImode,
214 /* MODE_CC */ CCmode,
215 /* MODE_COMPLEX_INT */ CQImode,
216 /* MODE_COMPLEX_FLOAT */ QCmode,
217 /* MODE_VECTOR_INT */ V2QImode,
218 /* MODE_VECTOR_FLOAT */ V2SFmode
222 /* Indexed by rtx code, gives a sequence of operand-types for
223 rtx's of that code. The sequence is a C string in which
224 each character describes one operand. */
226 const char * const rtx_format[NUM_RTX_CODE] = {
228 can cause a warning message
229 "0" field is unused (or used in a phase-dependent manner)
233 "n" like "i", but prints entries from `note_insn_name'
234 "w" an integer of width HOST_BITS_PER_WIDE_INT
236 "s" a pointer to a string
238 "S" like "s", but optional:
239 the containing rtx may end before this operand
240 "T" like "s", but treated specially by the RTL reader;
241 only found in machine description patterns.
242 "e" a pointer to an rtl expression
243 prints the expression
244 "E" a pointer to a vector that points to a number of rtl expressions
245 prints a list of the rtl expressions
246 "V" like "E", but optional:
247 the containing rtx may end before this operand
248 "u" a pointer to another insn
249 prints the uid of the insn.
250 "b" is a pointer to a bitmap header.
251 "t" is a tree pointer. */
253 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) FORMAT ,
254 #include "rtl.def" /* rtl expressions are defined here */
258 /* Indexed by rtx code, gives a character representing the "class" of
259 that rtx code. See rtl.def for documentation on the defined classes. */
261 const char rtx_class[NUM_RTX_CODE] = {
262 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) CLASS,
263 #include "rtl.def" /* rtl expressions are defined here */
267 /* Names for kinds of NOTEs and REG_NOTEs. */
269 const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS] =
271 "", "NOTE_INSN_DELETED",
272 "NOTE_INSN_BLOCK_BEG", "NOTE_INSN_BLOCK_END",
273 "NOTE_INSN_LOOP_BEG", "NOTE_INSN_LOOP_END",
274 "NOTE_INSN_LOOP_CONT", "NOTE_INSN_LOOP_VTOP",
275 "NOTE_INSN_LOOP_END_TOP_COND", "NOTE_INSN_FUNCTION_END",
276 "NOTE_INSN_PROLOGUE_END", "NOTE_INSN_EPILOGUE_BEG",
277 "NOTE_INSN_DELETED_LABEL", "NOTE_INSN_FUNCTION_BEG",
278 "NOTE_INSN_EH_REGION_BEG", "NOTE_INSN_EH_REGION_END",
279 "NOTE_INSN_REPEATED_LINE_NUMBER", "NOTE_INSN_RANGE_BEG",
280 "NOTE_INSN_RANGE_END", "NOTE_INSN_LIVE",
281 "NOTE_INSN_BASIC_BLOCK", "NOTE_INSN_EXPECTED_VALUE"
284 const char * const reg_note_name[] =
286 "", "REG_DEAD", "REG_INC", "REG_EQUIV", "REG_EQUAL",
287 "REG_WAS_0", "REG_RETVAL", "REG_LIBCALL", "REG_NONNEG",
288 "REG_NO_CONFLICT", "REG_UNUSED", "REG_CC_SETTER", "REG_CC_USER",
289 "REG_LABEL", "REG_DEP_ANTI", "REG_DEP_OUTPUT", "REG_BR_PROB",
290 "REG_EXEC_COUNT", "REG_NOALIAS", "REG_SAVE_AREA", "REG_BR_PRED",
291 "REG_FRAME_RELATED_EXPR", "REG_EH_CONTEXT", "REG_EH_REGION",
292 "REG_SAVE_NOTE", "REG_MAYBE_DEAD", "REG_NORETURN",
293 "REG_NON_LOCAL_GOTO", "REG_SETJMP", "REG_ALWAYS_RETURN",
298 /* Allocate an rtx vector of N elements.
299 Store the length, and initialize all elements to zero. */
307 rt = ggc_alloc_rtvec (n);
308 /* clear out the vector */
309 memset (&rt->elem[0], 0, n * sizeof (rtx));
311 PUT_NUM_ELEM (rt, n);
315 /* Allocate an rtx of code CODE. The CODE is stored in the rtx;
316 all the rest is initialized to zero. */
323 int n = GET_RTX_LENGTH (code);
325 rt = ggc_alloc_rtx (n);
327 /* We want to clear everything up to the FLD array. Normally, this
328 is one int, but we don't want to assume that and it isn't very
329 portable anyway; this is. */
331 memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));
337 /* Create a new copy of an rtx.
338 Recursively copies the operands of the rtx,
339 except for those few rtx codes that are sharable. */
348 const char *format_ptr;
350 code = GET_CODE (orig);
364 /* SCRATCH must be shared because they represent distinct values. */
369 /* CONST can be shared if it contains a SYMBOL_REF. If it contains
370 a LABEL_REF, it isn't sharable. */
371 if (GET_CODE (XEXP (orig, 0)) == PLUS
372 && GET_CODE (XEXP (XEXP (orig, 0), 0)) == SYMBOL_REF
373 && GET_CODE (XEXP (XEXP (orig, 0), 1)) == CONST_INT)
377 /* A MEM with a constant address is not sharable. The problem is that
378 the constant address may need to be reloaded. If the mem is shared,
379 then reloading one copy of this mem will cause all copies to appear
380 to have been reloaded. */
386 copy = rtx_alloc (code);
388 /* Copy the various flags, and other information. We assume that
389 all fields need copying, and then clear the fields that should
390 not be copied. That is the sensible default behavior, and forces
391 us to explicitly document why we are *not* copying a flag. */
392 memcpy (copy, orig, sizeof (struct rtx_def) - sizeof (rtunion));
394 /* We do not copy the USED flag, which is used as a mark bit during
395 walks over the RTL. */
398 /* We do not copy FRAME_RELATED for INSNs. */
399 if (GET_RTX_CLASS (code) == 'i')
400 copy->frame_related = 0;
401 copy->jump = orig->jump;
402 copy->call = orig->call;
404 format_ptr = GET_RTX_FORMAT (GET_CODE (copy));
406 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++)
408 copy->fld[i] = orig->fld[i];
409 switch (*format_ptr++)
412 if (XEXP (orig, i) != NULL)
413 XEXP (copy, i) = copy_rtx (XEXP (orig, i));
418 if (XVEC (orig, i) != NULL)
420 XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i));
421 for (j = 0; j < XVECLEN (copy, i); j++)
422 XVECEXP (copy, i, j) = copy_rtx (XVECEXP (orig, i, j));
434 /* These are left unchanged. */
444 /* Similar to `copy_rtx' except that if MAY_SHARE is present, it is
445 placed in the result directly, rather than being copied. */
448 copy_most_rtx (orig, may_share)
455 const char *format_ptr;
457 if (orig == may_share)
460 code = GET_CODE (orig);
478 copy = rtx_alloc (code);
479 PUT_MODE (copy, GET_MODE (orig));
480 copy->in_struct = orig->in_struct;
481 copy->volatil = orig->volatil;
482 copy->unchanging = orig->unchanging;
483 copy->integrated = orig->integrated;
484 copy->frame_related = orig->frame_related;
486 format_ptr = GET_RTX_FORMAT (GET_CODE (copy));
488 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++)
490 switch (*format_ptr++)
493 XEXP (copy, i) = XEXP (orig, i);
494 if (XEXP (orig, i) != NULL && XEXP (orig, i) != may_share)
495 XEXP (copy, i) = copy_most_rtx (XEXP (orig, i), may_share);
499 XEXP (copy, i) = XEXP (orig, i);
504 XVEC (copy, i) = XVEC (orig, i);
505 if (XVEC (orig, i) != NULL)
507 XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i));
508 for (j = 0; j < XVECLEN (copy, i); j++)
510 = copy_most_rtx (XVECEXP (orig, i, j), may_share);
515 XWINT (copy, i) = XWINT (orig, i);
520 XINT (copy, i) = XINT (orig, i);
524 XTREE (copy, i) = XTREE (orig, i);
529 XSTR (copy, i) = XSTR (orig, i);
533 /* Copy this through the wide int field; that's safest. */
534 X0WINT (copy, i) = X0WINT (orig, i);
544 /* Create a new copy of an rtx. Only copy just one level. */
547 shallow_copy_rtx (orig)
551 RTX_CODE code = GET_CODE (orig);
552 rtx copy = rtx_alloc (code);
554 PUT_MODE (copy, GET_MODE (orig));
555 copy->in_struct = orig->in_struct;
556 copy->volatil = orig->volatil;
557 copy->unchanging = orig->unchanging;
558 copy->integrated = orig->integrated;
559 copy->frame_related = orig->frame_related;
561 for (i = 0; i < GET_RTX_LENGTH (code); i++)
562 copy->fld[i] = orig->fld[i];
567 /* Return the alignment of MODE. This will be bounded by 1 and
568 BIGGEST_ALIGNMENT. */
571 get_mode_alignment (mode)
572 enum machine_mode mode;
574 unsigned int alignment;
576 if (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT
577 || GET_MODE_CLASS (mode) == MODE_COMPLEX_INT)
578 alignment = GET_MODE_UNIT_SIZE (mode);
580 alignment = GET_MODE_SIZE (mode);
582 /* Extract the LSB of the size. */
583 alignment = alignment & -alignment;
584 alignment *= BITS_PER_UNIT;
586 alignment = MIN (BIGGEST_ALIGNMENT, MAX (1, alignment));
590 /* This is 1 until after the rtl generation pass. */
591 int rtx_equal_function_value_matters;
593 /* Nonzero when we are generating CONCATs. */
594 int generating_concat_p;
596 /* Return 1 if X and Y are identical-looking rtx's.
597 This is the Lisp function EQUAL for rtx arguments. */
610 if (x == 0 || y == 0)
614 /* Rtx's of different codes cannot be equal. */
615 if (code != GET_CODE (y))
618 /* (MULT:SI x y) and (MULT:HI x y) are NOT equivalent.
619 (REG:SI x) and (REG:HI x) are NOT equivalent. */
621 if (GET_MODE (x) != GET_MODE (y))
624 /* Some RTL can be compared nonrecursively. */
628 /* Until rtl generation is complete, don't consider a reference
629 to the return register of the current function the same as
630 the return from a called function. This eases the job of
631 function integration. Once the distinction is no longer
632 needed, they can be considered equivalent. */
633 return (REGNO (x) == REGNO (y)
634 && (! rtx_equal_function_value_matters
635 || REG_FUNCTION_VALUE_P (x) == REG_FUNCTION_VALUE_P (y)));
638 return XEXP (x, 0) == XEXP (y, 0);
641 return XSTR (x, 0) == XSTR (y, 0);
653 /* Compare the elements. If any pair of corresponding elements
654 fail to match, return 0 for the whole things. */
656 fmt = GET_RTX_FORMAT (code);
657 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
662 if (XWINT (x, i) != XWINT (y, i))
668 if (XINT (x, i) != XINT (y, i))
674 /* Two vectors must have the same length. */
675 if (XVECLEN (x, i) != XVECLEN (y, i))
678 /* And the corresponding elements must match. */
679 for (j = 0; j < XVECLEN (x, i); j++)
680 if (rtx_equal_p (XVECEXP (x, i, j), XVECEXP (y, i, j)) == 0)
685 if (rtx_equal_p (XEXP (x, i), XEXP (y, i)) == 0)
691 if ((XSTR (x, i) || XSTR (y, i))
692 && (! XSTR (x, i) || ! XSTR (y, i)
693 || strcmp (XSTR (x, i), XSTR (y, i))))
698 /* These are just backpointers, so they don't matter. */
705 /* It is believed that rtx's at this level will never
706 contain anything but integers and other rtx's,
707 except for within LABEL_REFs and SYMBOL_REFs. */
715 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
717 rtl_check_failed_bounds (r, n, file, line, func)
725 ("RTL check: access of elt %d of `%s' with last elt %d in %s, at %s:%d",
726 n, GET_RTX_NAME (GET_CODE (r)), GET_RTX_LENGTH (GET_CODE (r)) - 1,
727 func, trim_filename (file), line);
731 rtl_check_failed_type1 (r, n, c1, file, line, func)
740 ("RTL check: expected elt %d type '%c', have '%c' (rtx %s) in %s, at %s:%d",
741 n, c1, GET_RTX_FORMAT (GET_CODE (r))[n], GET_RTX_NAME (GET_CODE (r)),
742 func, trim_filename (file), line);
746 rtl_check_failed_type2 (r, n, c1, c2, file, line, func)
756 ("RTL check: expected elt %d type '%c' or '%c', have '%c' (rtx %s) in %s, at %s:%d",
757 n, c1, c2, GET_RTX_FORMAT (GET_CODE (r))[n], GET_RTX_NAME (GET_CODE (r)),
758 func, trim_filename (file), line);
762 rtl_check_failed_code1 (r, code, file, line, func)
769 internal_error ("RTL check: expected code `%s', have `%s' in %s, at %s:%d",
770 GET_RTX_NAME (code), GET_RTX_NAME (GET_CODE (r)), func,
771 trim_filename (file), line);
775 rtl_check_failed_code2 (r, code1, code2, file, line, func)
777 enum rtx_code code1, code2;
783 ("RTL check: expected code `%s' or `%s', have `%s' in %s, at %s:%d",
784 GET_RTX_NAME (code1), GET_RTX_NAME (code2), GET_RTX_NAME (GET_CODE (r)),
785 func, trim_filename (file), line);
788 /* XXX Maybe print the vector? */
790 rtvec_check_failed_bounds (r, n, file, line, func)
798 ("RTL check: access of elt %d of vector with last elt %d in %s, at %s:%d",
799 n, GET_NUM_ELEM (r) - 1, func, trim_filename (file), line);
801 #endif /* ENABLE_RTL_CHECKING */