1 /* RTL utility routines.
2 Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001
3 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. */
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 e0wwwww, since REAL_ARITHMETIC assumes 16-bits
34 per element in REAL_VALUE_TYPE.
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 #ifdef REAL_ARITHMETIC
42 # if MAX_LONG_DOUBLE_TYPE_SIZE == 96
44 (11*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
46 # if MAX_LONG_DOUBLE_TYPE_SIZE == 128
48 (19*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
50 # if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
52 (7*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
56 #endif /* REAL_ARITHMETIC */
59 # if HOST_BITS_PER_WIDE_INT*2 >= MAX_LONG_DOUBLE_TYPE_SIZE
62 # if HOST_BITS_PER_WIDE_INT*3 >= MAX_LONG_DOUBLE_TYPE_SIZE
65 # if HOST_BITS_PER_WIDE_INT*4 >= MAX_LONG_DOUBLE_TYPE_SIZE
70 #endif /* REAL_WIDTH */
73 # define CONST_DOUBLE_FORMAT "e0ww"
76 # define CONST_DOUBLE_FORMAT "e0ww"
79 # define CONST_DOUBLE_FORMAT "e0www"
82 # define CONST_DOUBLE_FORMAT "e0wwww"
85 # define CONST_DOUBLE_FORMAT "e0wwwww"
87 # define CONST_DOUBLE_FORMAT /* nothing - will cause syntax error */
94 /* Indexed by rtx code, gives number of operands for an rtx with that code.
95 Does NOT include rtx header data (code and links). */
97 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) sizeof FORMAT - 1 ,
99 const int rtx_length[NUM_RTX_CODE + 1] = {
105 /* Indexed by rtx code, gives the name of that kind of rtx, as a C string. */
107 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) NAME ,
109 const char * const rtx_name[] = {
110 #include "rtl.def" /* rtl expressions are documented here */
115 /* Indexed by machine mode, gives the name of that machine mode.
116 This name does not include the letters "mode". */
118 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER) NAME,
120 const char * const mode_name[(int) MAX_MACHINE_MODE + 1] = {
121 #include "machmode.def"
122 /* Add an extra field to avoid a core dump if someone tries to convert
123 MAX_MACHINE_MODE to a string. */
129 /* Indexed by machine mode, gives the class mode for GET_MODE_CLASS. */
131 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER) CLASS,
133 const enum mode_class mode_class[(int) MAX_MACHINE_MODE] = {
134 #include "machmode.def"
139 /* Indexed by machine mode, gives the length of the mode, in bits.
140 GET_MODE_BITSIZE uses this. */
142 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER) BITSIZE,
144 const unsigned int mode_bitsize[(int) MAX_MACHINE_MODE] = {
145 #include "machmode.def"
150 /* Indexed by machine mode, gives the length of the mode, in bytes.
151 GET_MODE_SIZE uses this. */
153 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER) SIZE,
155 const unsigned int mode_size[(int) MAX_MACHINE_MODE] = {
156 #include "machmode.def"
161 /* Indexed by machine mode, gives the length of the mode's subunit.
162 GET_MODE_UNIT_SIZE uses this. */
164 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER) UNIT,
166 const unsigned int mode_unit_size[(int) MAX_MACHINE_MODE] = {
167 #include "machmode.def" /* machine modes are documented here */
172 /* Indexed by machine mode, gives next wider natural mode
173 (QI -> HI -> SI -> DI, etc.) Widening multiply instructions
176 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER) \
177 (unsigned char) WIDER,
179 const unsigned char mode_wider_mode[(int) MAX_MACHINE_MODE] = {
180 #include "machmode.def" /* machine modes are documented here */
185 #define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER) \
186 ((BITSIZE) >= HOST_BITS_PER_WIDE_INT) ? ~(unsigned HOST_WIDE_INT)0 : ((unsigned HOST_WIDE_INT) 1 << (BITSIZE)) - 1,
188 /* Indexed by machine mode, gives mask of significant bits in mode. */
190 const unsigned HOST_WIDE_INT mode_mask_array[(int) MAX_MACHINE_MODE] = {
191 #include "machmode.def"
194 /* Indexed by mode class, gives the narrowest mode for each class.
195 The Q modes are always of width 1 (2 for complex) - it is impossible
196 for any mode to be narrower.
198 Note that we use QImode instead of BImode for MODE_INT, since
199 otherwise the middle end will try to use it for bitfields in
200 structures and the like, which we do not want. Only the target
201 md file should generate BImode widgets. */
203 const enum machine_mode class_narrowest_mode[(int) MAX_MODE_CLASS] = {
204 /* MODE_RANDOM */ VOIDmode,
205 /* MODE_INT */ QImode,
206 /* MODE_FLOAT */ QFmode,
207 /* MODE_PARTIAL_INT */ PQImode,
208 /* MODE_CC */ CCmode,
209 /* MODE_COMPLEX_INT */ CQImode,
210 /* MODE_COMPLEX_FLOAT */ QCmode,
211 /* MODE_VECTOR_INT */ V2QImode,
212 /* MODE_VECTOR_FLOAT */ V2SFmode
216 /* Indexed by rtx code, gives a sequence of operand-types for
217 rtx's of that code. The sequence is a C string in which
218 each character describes one operand. */
220 const char * const rtx_format[] = {
222 can cause a warning message
223 "0" field is unused (or used in a phase-dependent manner)
227 "n" like "i", but prints entries from `note_insn_name'
228 "w" an integer of width HOST_BITS_PER_WIDE_INT
230 "s" a pointer to a string
232 "S" like "s", but optional:
233 the containing rtx may end before this operand
234 "T" like "s", but treated specially by the RTL reader;
235 only found in machine description patterns.
236 "e" a pointer to an rtl expression
237 prints the expression
238 "E" a pointer to a vector that points to a number of rtl expressions
239 prints a list of the rtl expressions
240 "V" like "E", but optional:
241 the containing rtx may end before this operand
242 "u" a pointer to another insn
243 prints the uid of the insn.
244 "b" is a pointer to a bitmap header.
245 "t" is a tree pointer. */
247 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) FORMAT ,
248 #include "rtl.def" /* rtl expressions are defined here */
252 /* Indexed by rtx code, gives a character representing the "class" of
253 that rtx code. See rtl.def for documentation on the defined classes. */
255 const char rtx_class[] = {
256 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) CLASS,
257 #include "rtl.def" /* rtl expressions are defined here */
261 /* Names for kinds of NOTEs and REG_NOTEs. */
263 const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS] =
265 "", "NOTE_INSN_DELETED",
266 "NOTE_INSN_BLOCK_BEG", "NOTE_INSN_BLOCK_END",
267 "NOTE_INSN_LOOP_BEG", "NOTE_INSN_LOOP_END",
268 "NOTE_INSN_LOOP_CONT", "NOTE_INSN_LOOP_VTOP",
269 "NOTE_INSN_FUNCTION_END", "NOTE_INSN_SETJMP",
270 "NOTE_INSN_PROLOGUE_END", "NOTE_INSN_EPILOGUE_BEG",
271 "NOTE_INSN_DELETED_LABEL", "NOTE_INSN_FUNCTION_BEG",
272 "NOTE_INSN_EH_REGION_BEG", "NOTE_INSN_EH_REGION_END",
273 "NOTE_INSN_REPEATED_LINE_NUMBER", "NOTE_INSN_RANGE_BEG",
274 "NOTE_INSN_RANGE_END", "NOTE_INSN_LIVE",
275 "NOTE_INSN_BASIC_BLOCK", "NOTE_INSN_EXPECTED_VALUE"
278 const char * const reg_note_name[] =
280 "", "REG_DEAD", "REG_INC", "REG_EQUIV", "REG_EQUAL",
281 "REG_WAS_0", "REG_RETVAL", "REG_LIBCALL", "REG_NONNEG",
282 "REG_NO_CONFLICT", "REG_UNUSED", "REG_CC_SETTER", "REG_CC_USER",
283 "REG_LABEL", "REG_DEP_ANTI", "REG_DEP_OUTPUT", "REG_BR_PROB",
284 "REG_EXEC_COUNT", "REG_NOALIAS", "REG_SAVE_AREA", "REG_BR_PRED",
285 "REG_FRAME_RELATED_EXPR", "REG_EH_CONTEXT", "REG_EH_REGION",
286 "REG_EH_RETHROW", "REG_SAVE_NOTE", "REG_MAYBE_DEAD", "REG_NORETURN",
291 /* Allocate an rtx vector of N elements.
292 Store the length, and initialize all elements to zero. */
300 rt = ggc_alloc_rtvec (n);
301 /* clear out the vector */
302 memset (&rt->elem[0], 0, n * sizeof (rtx));
304 PUT_NUM_ELEM (rt, n);
308 /* Allocate an rtx of code CODE. The CODE is stored in the rtx;
309 all the rest is initialized to zero. */
316 int n = GET_RTX_LENGTH (code);
318 rt = ggc_alloc_rtx (n);
320 /* We want to clear everything up to the FLD array. Normally, this
321 is one int, but we don't want to assume that and it isn't very
322 portable anyway; this is. */
324 memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));
330 /* Create a new copy of an rtx.
331 Recursively copies the operands of the rtx,
332 except for those few rtx codes that are sharable. */
340 register RTX_CODE code;
341 register const char *format_ptr;
343 code = GET_CODE (orig);
356 /* SCRATCH must be shared because they represent distinct values. */
361 /* CONST can be shared if it contains a SYMBOL_REF. If it contains
362 a LABEL_REF, it isn't sharable. */
363 if (GET_CODE (XEXP (orig, 0)) == PLUS
364 && GET_CODE (XEXP (XEXP (orig, 0), 0)) == SYMBOL_REF
365 && GET_CODE (XEXP (XEXP (orig, 0), 1)) == CONST_INT)
369 /* A MEM with a constant address is not sharable. The problem is that
370 the constant address may need to be reloaded. If the mem is shared,
371 then reloading one copy of this mem will cause all copies to appear
372 to have been reloaded. */
378 copy = rtx_alloc (code);
380 /* Copy the various flags, and other information. We assume that
381 all fields need copying, and then clear the fields that should
382 not be copied. That is the sensible default behavior, and forces
383 us to explicitly document why we are *not* copying a flag. */
384 memcpy (copy, orig, sizeof (struct rtx_def) - sizeof (rtunion));
386 /* We do not copy the USED flag, which is used as a mark bit during
387 walks over the RTL. */
390 /* We do not copy FRAME_RELATED for INSNs. */
391 if (GET_RTX_CLASS (code) == 'i')
392 copy->frame_related = 0;
393 copy->jump = orig->jump;
394 copy->call = orig->call;
396 format_ptr = GET_RTX_FORMAT (GET_CODE (copy));
398 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++)
400 copy->fld[i] = orig->fld[i];
401 switch (*format_ptr++)
404 if (XEXP (orig, i) != NULL)
405 XEXP (copy, i) = copy_rtx (XEXP (orig, i));
410 if (XVEC (orig, i) != NULL)
412 XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i));
413 for (j = 0; j < XVECLEN (copy, i); j++)
414 XVECEXP (copy, i, j) = copy_rtx (XVECEXP (orig, i, j));
425 /* These are left unchanged. */
435 /* Similar to `copy_rtx' except that if MAY_SHARE is present, it is
436 placed in the result directly, rather than being copied. */
439 copy_most_rtx (orig, may_share)
441 register rtx may_share;
445 register RTX_CODE code;
446 register const char *format_ptr;
448 if (orig == may_share)
451 code = GET_CODE (orig);
468 copy = rtx_alloc (code);
469 PUT_MODE (copy, GET_MODE (orig));
470 copy->in_struct = orig->in_struct;
471 copy->volatil = orig->volatil;
472 copy->unchanging = orig->unchanging;
473 copy->integrated = orig->integrated;
474 copy->frame_related = orig->frame_related;
476 format_ptr = GET_RTX_FORMAT (GET_CODE (copy));
478 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++)
480 switch (*format_ptr++)
483 XEXP (copy, i) = XEXP (orig, i);
484 if (XEXP (orig, i) != NULL && XEXP (orig, i) != may_share)
485 XEXP (copy, i) = copy_most_rtx (XEXP (orig, i), may_share);
489 XEXP (copy, i) = XEXP (orig, i);
494 XVEC (copy, i) = XVEC (orig, i);
495 if (XVEC (orig, i) != NULL)
497 XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i));
498 for (j = 0; j < XVECLEN (copy, i); j++)
500 = copy_most_rtx (XVECEXP (orig, i, j), may_share);
505 XWINT (copy, i) = XWINT (orig, i);
510 XINT (copy, i) = XINT (orig, i);
514 XTREE (copy, i) = XTREE (orig, i);
519 XSTR (copy, i) = XSTR (orig, i);
523 /* Copy this through the wide int field; that's safest. */
524 X0WINT (copy, i) = X0WINT (orig, i);
534 /* Create a new copy of an rtx. Only copy just one level. */
536 shallow_copy_rtx (orig)
540 register RTX_CODE code = GET_CODE (orig);
541 register rtx copy = rtx_alloc (code);
543 PUT_MODE (copy, GET_MODE (orig));
544 copy->in_struct = orig->in_struct;
545 copy->volatil = orig->volatil;
546 copy->unchanging = orig->unchanging;
547 copy->integrated = orig->integrated;
548 copy->frame_related = orig->frame_related;
550 for (i = 0; i < GET_RTX_LENGTH (code); i++)
551 copy->fld[i] = orig->fld[i];
556 /* This is 1 until after the rtl generation pass. */
557 int rtx_equal_function_value_matters;
559 /* Nonzero when we are generating CONCATs. */
560 int generating_concat_p;
562 /* Return 1 if X and Y are identical-looking rtx's.
563 This is the Lisp function EQUAL for rtx arguments. */
571 register enum rtx_code code;
572 register const char *fmt;
576 if (x == 0 || y == 0)
580 /* Rtx's of different codes cannot be equal. */
581 if (code != GET_CODE (y))
584 /* (MULT:SI x y) and (MULT:HI x y) are NOT equivalent.
585 (REG:SI x) and (REG:HI x) are NOT equivalent. */
587 if (GET_MODE (x) != GET_MODE (y))
590 /* Some RTL can be compared nonrecursively. */
594 /* Until rtl generation is complete, don't consider a reference to the
595 return register of the current function the same as the return from a
596 called function. This eases the job of function integration. Once the
597 distinction is no longer needed, they can be considered equivalent. */
598 return (REGNO (x) == REGNO (y)
599 && (! rtx_equal_function_value_matters
600 || REG_FUNCTION_VALUE_P (x) == REG_FUNCTION_VALUE_P (y)));
603 return XEXP (x, 0) == XEXP (y, 0);
606 return XSTR (x, 0) == XSTR (y, 0);
617 /* Compare the elements. If any pair of corresponding elements
618 fail to match, return 0 for the whole things. */
620 fmt = GET_RTX_FORMAT (code);
621 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
626 if (XWINT (x, i) != XWINT (y, i))
632 if (XINT (x, i) != XINT (y, i))
638 /* Two vectors must have the same length. */
639 if (XVECLEN (x, i) != XVECLEN (y, i))
642 /* And the corresponding elements must match. */
643 for (j = 0; j < XVECLEN (x, i); j++)
644 if (rtx_equal_p (XVECEXP (x, i, j), XVECEXP (y, i, j)) == 0)
649 if (rtx_equal_p (XEXP (x, i), XEXP (y, i)) == 0)
655 if (strcmp (XSTR (x, i), XSTR (y, i)))
660 /* These are just backpointers, so they don't matter. */
667 /* It is believed that rtx's at this level will never
668 contain anything but integers and other rtx's,
669 except for within LABEL_REFs and SYMBOL_REFs. */
677 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
679 rtl_check_failed_bounds (r, n, file, line, func)
687 ("RTL check: access of elt %d of `%s' with last elt %d in %s, at %s:%d",
688 n, GET_RTX_NAME (GET_CODE (r)), GET_RTX_LENGTH (GET_CODE (r)) - 1,
689 func, trim_filename (file), line);
693 rtl_check_failed_type1 (r, n, c1, file, line, func)
702 ("RTL check: expected elt %d type '%c', have '%c' (rtx %s) in %s, at %s:%d",
703 n, c1, GET_RTX_FORMAT (GET_CODE (r))[n], GET_RTX_NAME (GET_CODE (r)),
704 func, trim_filename (file), line);
708 rtl_check_failed_type2 (r, n, c1, c2, file, line, func)
718 ("RTL check: expected elt %d type '%c' or '%c', have '%c' (rtx %s) in %s, at %s:%d",
719 n, c1, c2, GET_RTX_FORMAT (GET_CODE (r))[n], GET_RTX_NAME (GET_CODE (r)),
720 func, trim_filename (file), line);
724 rtl_check_failed_code1 (r, code, file, line, func)
731 internal_error ("RTL check: expected code `%s', have `%s' in %s, at %s:%d",
732 GET_RTX_NAME (code), GET_RTX_NAME (GET_CODE (r)), func,
733 trim_filename (file), line);
737 rtl_check_failed_code2 (r, code1, code2, file, line, func)
739 enum rtx_code code1, code2;
745 ("RTL check: expected code `%s' or `%s', have `%s' in %s, at %s:%d",
746 GET_RTX_NAME (code1), GET_RTX_NAME (code2), GET_RTX_NAME (GET_CODE (r)),
747 func, trim_filename (file), line);
750 /* XXX Maybe print the vector? */
752 rtvec_check_failed_bounds (r, n, file, line, func)
760 ("RTL check: access of elt %d of vector with last elt %d in %s, at %s:%d",
761 n, GET_NUM_ELEM (r) - 1, func, trim_filename (file), line);
763 #endif /* ENABLE_RTL_CHECKING */