GCC Middle and Back End API Reference
rtl.h
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1 /* Register Transfer Language (RTL) definitions for GCC
2  Copyright (C) 1987-2013 Free Software Foundation, Inc.
3 
4 This file is part of GCC.
5 
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
9 version.
10 
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
15 
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
19 
20 #ifndef GCC_RTL_H
21 #define GCC_RTL_H
22 
23 #include "statistics.h"
24 #include "machmode.h"
25 #include "input.h"
26 #include "real.h"
27 #include "vec.h"
28 #include "fixed-value.h"
29 #include "alias.h"
30 #include "hashtab.h"
31 #include "flags.h"
32 
33 /* Value used by some passes to "recognize" noop moves as valid
34  instructions. */
35 #define NOOP_MOVE_INSN_CODE INT_MAX
36 
37 /* Register Transfer Language EXPRESSIONS CODES */
38 
39 #define RTX_CODE enum rtx_code
40 enum rtx_code {
41 
42 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
43 #include "rtl.def" /* rtl expressions are documented here */
44 #undef DEF_RTL_EXPR
45 
46  LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for
47  NUM_RTX_CODE.
48  Assumes default enum value assignment. */
49 
50 /* The cast here, saves many elsewhere. */
51 #define NUM_RTX_CODE ((int) LAST_AND_UNUSED_RTX_CODE)
52 
53 /* Similar, but since generator files get more entries... */
54 #ifdef GENERATOR_FILE
55 # define NON_GENERATOR_NUM_RTX_CODE ((int) MATCH_OPERAND)
56 #endif
57 
58 /* Register Transfer Language EXPRESSIONS CODE CLASSES */
59 
60 enum rtx_class {
61  /* We check bit 0-1 of some rtx class codes in the predicates below. */
62 
63  /* Bit 0 = comparison if 0, arithmetic is 1
64  Bit 1 = 1 if commutative. */
65  RTX_COMPARE, /* 0 */
66  RTX_COMM_COMPARE,
67  RTX_BIN_ARITH,
68  RTX_COMM_ARITH,
69 
70  /* Must follow the four preceding values. */
71  RTX_UNARY, /* 4 */
72 
73  RTX_EXTRA,
74  RTX_MATCH,
75  RTX_INSN,
76 
77  /* Bit 0 = 1 if constant. */
78  RTX_OBJ, /* 8 */
79  RTX_CONST_OBJ,
80 
81  RTX_TERNARY,
82  RTX_BITFIELD_OPS,
83  RTX_AUTOINC
84 };
85 
86 #define RTX_OBJ_MASK (~1)
87 #define RTX_OBJ_RESULT (RTX_OBJ & RTX_OBJ_MASK)
88 #define RTX_COMPARE_MASK (~1)
89 #define RTX_COMPARE_RESULT (RTX_COMPARE & RTX_COMPARE_MASK)
90 #define RTX_ARITHMETIC_MASK (~1)
91 #define RTX_ARITHMETIC_RESULT (RTX_COMM_ARITH & RTX_ARITHMETIC_MASK)
92 #define RTX_BINARY_MASK (~3)
93 #define RTX_BINARY_RESULT (RTX_COMPARE & RTX_BINARY_MASK)
94 #define RTX_COMMUTATIVE_MASK (~2)
95 #define RTX_COMMUTATIVE_RESULT (RTX_COMM_COMPARE & RTX_COMMUTATIVE_MASK)
96 #define RTX_NON_COMMUTATIVE_RESULT (RTX_COMPARE & RTX_COMMUTATIVE_MASK)
97 
98 extern const unsigned char rtx_length[NUM_RTX_CODE];
99 #define GET_RTX_LENGTH(CODE) (rtx_length[(int) (CODE)])
100 
101 extern const char * const rtx_name[NUM_RTX_CODE];
102 #define GET_RTX_NAME(CODE) (rtx_name[(int) (CODE)])
103 
104 extern const char * const rtx_format[NUM_RTX_CODE];
105 #define GET_RTX_FORMAT(CODE) (rtx_format[(int) (CODE)])
106 
107 extern const enum rtx_class rtx_class[NUM_RTX_CODE];
108 #define GET_RTX_CLASS(CODE) (rtx_class[(int) (CODE)])
109 
110 extern const unsigned char rtx_code_size[NUM_RTX_CODE];
111 extern const unsigned char rtx_next[NUM_RTX_CODE];
112 
113 /* The flags and bitfields of an ADDR_DIFF_VEC. BASE is the base label
114  relative to which the offsets are calculated, as explained in rtl.def. */
115 typedef struct
116 {
117  /* Set at the start of shorten_branches - ONLY WHEN OPTIMIZING - : */
118  unsigned min_align: 8;
119  /* Flags: */
120  unsigned base_after_vec: 1; /* BASE is after the ADDR_DIFF_VEC. */
121  unsigned min_after_vec: 1; /* minimum address target label is
122  after the ADDR_DIFF_VEC. */
123  unsigned max_after_vec: 1; /* maximum address target label is
124  after the ADDR_DIFF_VEC. */
125  unsigned min_after_base: 1; /* minimum address target label is
126  after BASE. */
127  unsigned max_after_base: 1; /* maximum address target label is
128  after BASE. */
129  /* Set by the actual branch shortening process - ONLY WHEN OPTIMIZING - : */
130  unsigned offset_unsigned: 1; /* offsets have to be treated as unsigned. */
131  unsigned : 2;
132  unsigned scale : 8;
133 } addr_diff_vec_flags;
134 
135 /* Structure used to describe the attributes of a MEM. These are hashed
136  so MEMs that the same attributes share a data structure. This means
137  they cannot be modified in place. */
138 typedef struct GTY(()) mem_attrs
139 {
140  /* The expression that the MEM accesses, or null if not known.
141  This expression might be larger than the memory reference itself.
142  (In other words, the MEM might access only part of the object.) */
143  tree expr;
144 
145  /* The offset of the memory reference from the start of EXPR.
146  Only valid if OFFSET_KNOWN_P. */
147  HOST_WIDE_INT offset;
148 
149  /* The size of the memory reference in bytes. Only valid if
150  SIZE_KNOWN_P. */
151  HOST_WIDE_INT size;
152 
153  /* The alias set of the memory reference. */
154  alias_set_type alias;
155 
156  /* The alignment of the reference in bits. Always a multiple of
157  BITS_PER_UNIT. Note that EXPR may have a stricter alignment
158  than the memory reference itself. */
159  unsigned int align;
160 
161  /* The address space that the memory reference uses. */
162  unsigned char addrspace;
163 
164  /* True if OFFSET is known. */
165  bool offset_known_p;
166 
167  /* True if SIZE is known. */
168  bool size_known_p;
169 } mem_attrs;
170 
171 /* Structure used to describe the attributes of a REG in similar way as
172  mem_attrs does for MEM above. Note that the OFFSET field is calculated
173  in the same way as for mem_attrs, rather than in the same way as a
174  SUBREG_BYTE. For example, if a big-endian target stores a byte
175  object in the low part of a 4-byte register, the OFFSET field
176  will be -3 rather than 0. */
177 
178 typedef struct GTY(()) reg_attrs {
179  tree decl; /* decl corresponding to REG. */
180  HOST_WIDE_INT offset; /* Offset from start of DECL. */
181 } reg_attrs;
182 
183 /* Common union for an element of an rtx. */
184 
185 union rtunion_def
186 {
187  int rt_int;
188  unsigned int rt_uint;
189  const char *rt_str;
190  rtx rt_rtx;
191  rtvec rt_rtvec;
192  enum machine_mode rt_type;
193  addr_diff_vec_flags rt_addr_diff_vec_flags;
194  struct cselib_val_struct *rt_cselib;
195  tree rt_tree;
196  basic_block rt_bb;
197  mem_attrs *rt_mem;
198  reg_attrs *rt_reg;
199  struct constant_descriptor_rtx *rt_constant;
200  struct dw_cfi_struct *rt_cfi;
201 };
202 typedef union rtunion_def rtunion;
203 
204 /* This structure remembers the position of a SYMBOL_REF within an
205  object_block structure. A SYMBOL_REF only provides this information
206  if SYMBOL_REF_HAS_BLOCK_INFO_P is true. */
207 struct GTY(()) block_symbol {
208  /* The usual SYMBOL_REF fields. */
209  rtunion GTY ((skip)) fld[3];
210 
211  /* The block that contains this object. */
212  struct object_block *block;
213 
214  /* The offset of this object from the start of its block. It is negative
215  if the symbol has not yet been assigned an offset. */
216  HOST_WIDE_INT offset;
217 };
218 
219 /* Describes a group of objects that are to be placed together in such
220  a way that their relative positions are known. */
221 struct GTY(()) object_block {
222  /* The section in which these objects should be placed. */
223  section *sect;
224 
225  /* The alignment of the first object, measured in bits. */
226  unsigned int alignment;
227 
228  /* The total size of the objects, measured in bytes. */
229  HOST_WIDE_INT size;
230 
231  /* The SYMBOL_REFs for each object. The vector is sorted in
232  order of increasing offset and the following conditions will
233  hold for each element X:
234 
235  SYMBOL_REF_HAS_BLOCK_INFO_P (X)
236  !SYMBOL_REF_ANCHOR_P (X)
237  SYMBOL_REF_BLOCK (X) == [address of this structure]
238  SYMBOL_REF_BLOCK_OFFSET (X) >= 0. */
239  vec<rtx, va_gc> *objects;
240 
241  /* All the anchor SYMBOL_REFs used to address these objects, sorted
242  in order of increasing offset, and then increasing TLS model.
243  The following conditions will hold for each element X in this vector:
244 
245  SYMBOL_REF_HAS_BLOCK_INFO_P (X)
246  SYMBOL_REF_ANCHOR_P (X)
247  SYMBOL_REF_BLOCK (X) == [address of this structure]
248  SYMBOL_REF_BLOCK_OFFSET (X) >= 0. */
249  vec<rtx, va_gc> *anchors;
250 };
251 
252 /* RTL expression ("rtx"). */
253 
254 struct GTY((chain_next ("RTX_NEXT (&%h)"),
255  chain_prev ("RTX_PREV (&%h)"), variable_size)) rtx_def {
256  /* The kind of expression this is. */
257  ENUM_BITFIELD(rtx_code) code: 16;
258 
259  /* The kind of value the expression has. */
260  ENUM_BITFIELD(machine_mode) mode : 8;
261 
262  /* 1 in a MEM if we should keep the alias set for this mem unchanged
263  when we access a component.
264  1 in a CALL_INSN if it is a sibling call.
265  1 in a SET that is for a return.
266  In a CODE_LABEL, part of the two-bit alternate entry field.
267  1 in a CONCAT is VAL_EXPR_IS_COPIED in var-tracking.c.
268  1 in a VALUE is SP_BASED_VALUE_P in cselib.c.
269  1 in a SUBREG generated by LRA for reload insns. */
270  unsigned int jump : 1;
271  /* In a CODE_LABEL, part of the two-bit alternate entry field.
272  1 in a MEM if it cannot trap.
273  1 in a CALL_INSN logically equivalent to
274  ECF_LOOPING_CONST_OR_PURE and DECL_LOOPING_CONST_OR_PURE_P. */
275  unsigned int call : 1;
276  /* 1 in a REG, MEM, or CONCAT if the value is set at most once, anywhere.
277  1 in a SUBREG used for SUBREG_PROMOTED_UNSIGNED_P.
278  1 in a SYMBOL_REF if it addresses something in the per-function
279  constants pool.
280  1 in a CALL_INSN logically equivalent to ECF_CONST and TREE_READONLY.
281  1 in a NOTE, or EXPR_LIST for a const call.
282  1 in a JUMP_INSN of an annulling branch.
283  1 in a CONCAT is VAL_EXPR_IS_CLOBBERED in var-tracking.c.
284  1 in a preserved VALUE is PRESERVED_VALUE_P in cselib.c.
285  1 in a clobber temporarily created for LRA. */
286  unsigned int unchanging : 1;
287  /* 1 in a MEM or ASM_OPERANDS expression if the memory reference is volatile.
288  1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL, BARRIER, or NOTE
289  if it has been deleted.
290  1 in a REG expression if corresponds to a variable declared by the user,
291  0 for an internally generated temporary.
292  1 in a SUBREG used for SUBREG_PROMOTED_UNSIGNED_P.
293  1 in a LABEL_REF, REG_LABEL_TARGET or REG_LABEL_OPERAND note for a
294  non-local label.
295  In a SYMBOL_REF, this flag is used for machine-specific purposes.
296  In a PREFETCH, this flag indicates that it should be considered a scheduling
297  barrier.
298  1 in a CONCAT is VAL_NEEDS_RESOLUTION in var-tracking.c. */
299  unsigned int volatil : 1;
300  /* 1 in a REG if the register is used only in exit code a loop.
301  1 in a SUBREG expression if was generated from a variable with a
302  promoted mode.
303  1 in a CODE_LABEL if the label is used for nonlocal gotos
304  and must not be deleted even if its count is zero.
305  1 in an INSN, JUMP_INSN or CALL_INSN if this insn must be scheduled
306  together with the preceding insn. Valid only within sched.
307  1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
308  from the target of a branch. Valid from reorg until end of compilation;
309  cleared before used.
310 
311  The name of the field is historical. It used to be used in MEMs
312  to record whether the MEM accessed part of a structure. */
313  unsigned int in_struct : 1;
314  /* At the end of RTL generation, 1 if this rtx is used. This is used for
315  copying shared structure. See `unshare_all_rtl'.
316  In a REG, this is not needed for that purpose, and used instead
317  in `leaf_renumber_regs_insn'.
318  1 in a SYMBOL_REF, means that emit_library_call
319  has used it as the function.
320  1 in a CONCAT is VAL_HOLDS_TRACK_EXPR in var-tracking.c.
321  1 in a VALUE or DEBUG_EXPR is VALUE_RECURSED_INTO in var-tracking.c. */
322  unsigned int used : 1;
323  /* 1 in an INSN or a SET if this rtx is related to the call frame,
324  either changing how we compute the frame address or saving and
325  restoring registers in the prologue and epilogue.
326  1 in a REG or MEM if it is a pointer.
327  1 in a SYMBOL_REF if it addresses something in the per-function
328  constant string pool.
329  1 in a VALUE is VALUE_CHANGED in var-tracking.c. */
330  unsigned frame_related : 1;
331  /* 1 in a REG or PARALLEL that is the current function's return value.
332  1 in a SYMBOL_REF for a weak symbol.
333  1 in a CALL_INSN logically equivalent to ECF_PURE and DECL_PURE_P.
334  1 in a CONCAT is VAL_EXPR_HAS_REVERSE in var-tracking.c.
335  1 in a VALUE or DEBUG_EXPR is NO_LOC_P in var-tracking.c. */
336  unsigned return_val : 1;
337 
338  /* The first element of the operands of this rtx.
339  The number of operands and their types are controlled
340  by the `code' field, according to rtl.def. */
341  union u {
342  rtunion fld[1];
343  HOST_WIDE_INT hwint[1];
344  struct block_symbol block_sym;
345  struct real_value rv;
346  struct fixed_value fv;
347  } GTY ((special ("rtx_def"), desc ("GET_CODE (&%0)"))) u;
348 };
349 
350 /* The size in bytes of an rtx header (code, mode and flags). */
351 #define RTX_HDR_SIZE offsetof (struct rtx_def, u)
352 
353 /* The size in bytes of an rtx with code CODE. */
354 #define RTX_CODE_SIZE(CODE) rtx_code_size[CODE]
355 
356 #define NULL_RTX (rtx) 0
357 
358 /* The "next" and "previous" RTX, relative to this one. */
359 
360 #define RTX_NEXT(X) (rtx_next[GET_CODE (X)] == 0 ? NULL \
361  : *(rtx *)(((char *)X) + rtx_next[GET_CODE (X)]))
362 
363 /* FIXME: the "NEXT_INSN (PREV_INSN (X)) == X" condition shouldn't be needed.
364  */
365 #define RTX_PREV(X) ((INSN_P (X) \
366  || NOTE_P (X) \
367  || JUMP_TABLE_DATA_P (X) \
368  || BARRIER_P (X) \
369  || LABEL_P (X)) \
370  && PREV_INSN (X) != NULL \
371  && NEXT_INSN (PREV_INSN (X)) == X \
372  ? PREV_INSN (X) : NULL)
373 
374 /* Define macros to access the `code' field of the rtx. */
375 
376 #define GET_CODE(RTX) ((enum rtx_code) (RTX)->code)
377 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
378 
379 #define GET_MODE(RTX) ((enum machine_mode) (RTX)->mode)
380 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
381 
382 /* RTL vector. These appear inside RTX's when there is a need
383  for a variable number of things. The principle use is inside
384  PARALLEL expressions. */
385 
386 struct GTY((variable_size)) rtvec_def {
387  int num_elem; /* number of elements */
388  rtx GTY ((length ("%h.num_elem"))) elem[1];
389 };
390 
391 #define NULL_RTVEC (rtvec) 0
392 
393 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
394 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
395 
396 /* Predicate yielding nonzero iff X is an rtx for a register. */
397 #define REG_P(X) (GET_CODE (X) == REG)
398 
399 /* Predicate yielding nonzero iff X is an rtx for a memory location. */
400 #define MEM_P(X) (GET_CODE (X) == MEM)
401 
402 /* Match CONST_*s that can represent compile-time constant integers. */
403 #define CASE_CONST_SCALAR_INT \
404  case CONST_INT: \
405  case CONST_DOUBLE
406 
407 /* Match CONST_*s for which pointer equality corresponds to value equality. */
408 #define CASE_CONST_UNIQUE \
409  case CONST_INT: \
410  case CONST_DOUBLE: \
411  case CONST_FIXED
412 
413 /* Match all CONST_* rtxes. */
414 #define CASE_CONST_ANY \
415  case CONST_INT: \
416  case CONST_DOUBLE: \
417  case CONST_FIXED: \
418  case CONST_VECTOR
419 
420 /* Predicate yielding nonzero iff X is an rtx for a constant integer. */
421 #define CONST_INT_P(X) (GET_CODE (X) == CONST_INT)
422 
423 /* Predicate yielding nonzero iff X is an rtx for a constant fixed-point. */
424 #define CONST_FIXED_P(X) (GET_CODE (X) == CONST_FIXED)
425 
426 /* Predicate yielding true iff X is an rtx for a double-int
427  or floating point constant. */
428 #define CONST_DOUBLE_P(X) (GET_CODE (X) == CONST_DOUBLE)
429 
430 /* Predicate yielding true iff X is an rtx for a double-int. */
431 #define CONST_DOUBLE_AS_INT_P(X) \
432  (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) == VOIDmode)
433 
434 /* Predicate yielding true iff X is an rtx for a integer const. */
435 #define CONST_SCALAR_INT_P(X) \
436  (CONST_INT_P (X) || CONST_DOUBLE_AS_INT_P (X))
437 
438 /* Predicate yielding true iff X is an rtx for a double-int. */
439 #define CONST_DOUBLE_AS_FLOAT_P(X) \
440  (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) != VOIDmode)
441 
442 /* Predicate yielding nonzero iff X is a label insn. */
443 #define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
444 
445 /* Predicate yielding nonzero iff X is a jump insn. */
446 #define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
447 
448 /* Predicate yielding nonzero iff X is a call insn. */
449 #define CALL_P(X) (GET_CODE (X) == CALL_INSN)
450 
451 /* Predicate yielding nonzero iff X is an insn that cannot jump. */
452 #define NONJUMP_INSN_P(X) (GET_CODE (X) == INSN)
453 
454 /* Predicate yielding nonzero iff X is a debug note/insn. */
455 #define DEBUG_INSN_P(X) (GET_CODE (X) == DEBUG_INSN)
456 
457 /* Predicate yielding nonzero iff X is an insn that is not a debug insn. */
458 #define NONDEBUG_INSN_P(X) (INSN_P (X) && !DEBUG_INSN_P (X))
459 
460 /* Nonzero if DEBUG_INSN_P may possibly hold. */
461 #define MAY_HAVE_DEBUG_INSNS (flag_var_tracking_assignments)
462 
463 /* Predicate yielding nonzero iff X is a real insn. */
464 #define INSN_P(X) \
465  (NONJUMP_INSN_P (X) || DEBUG_INSN_P (X) || JUMP_P (X) || CALL_P (X))
466 
467 /* Predicate yielding nonzero iff X is a note insn. */
468 #define NOTE_P(X) (GET_CODE (X) == NOTE)
469 
470 /* Predicate yielding nonzero iff X is a barrier insn. */
471 #define BARRIER_P(X) (GET_CODE (X) == BARRIER)
472 
473 /* Predicate yielding nonzero iff X is a data for a jump table. */
474 #define JUMP_TABLE_DATA_P(INSN) (GET_CODE (INSN) == JUMP_TABLE_DATA)
475 
476 /* Predicate yielding nonzero iff X is a return or simple_return. */
477 #define ANY_RETURN_P(X) \
478  (GET_CODE (X) == RETURN || GET_CODE (X) == SIMPLE_RETURN)
479 
480 /* 1 if X is a unary operator. */
481 
482 #define UNARY_P(X) \
483  (GET_RTX_CLASS (GET_CODE (X)) == RTX_UNARY)
484 
485 /* 1 if X is a binary operator. */
486 
487 #define BINARY_P(X) \
488  ((GET_RTX_CLASS (GET_CODE (X)) & RTX_BINARY_MASK) == RTX_BINARY_RESULT)
489 
490 /* 1 if X is an arithmetic operator. */
491 
492 #define ARITHMETIC_P(X) \
493  ((GET_RTX_CLASS (GET_CODE (X)) & RTX_ARITHMETIC_MASK) \
494  == RTX_ARITHMETIC_RESULT)
495 
496 /* 1 if X is an arithmetic operator. */
497 
498 #define COMMUTATIVE_ARITH_P(X) \
499  (GET_RTX_CLASS (GET_CODE (X)) == RTX_COMM_ARITH)
500 
501 /* 1 if X is a commutative arithmetic operator or a comparison operator.
502  These two are sometimes selected together because it is possible to
503  swap the two operands. */
504 
505 #define SWAPPABLE_OPERANDS_P(X) \
506  ((1 << GET_RTX_CLASS (GET_CODE (X))) \
507  & ((1 << RTX_COMM_ARITH) | (1 << RTX_COMM_COMPARE) \
508  | (1 << RTX_COMPARE)))
509 
510 /* 1 if X is a non-commutative operator. */
511 
512 #define NON_COMMUTATIVE_P(X) \
513  ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMMUTATIVE_MASK) \
514  == RTX_NON_COMMUTATIVE_RESULT)
515 
516 /* 1 if X is a commutative operator on integers. */
517 
518 #define COMMUTATIVE_P(X) \
519  ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMMUTATIVE_MASK) \
520  == RTX_COMMUTATIVE_RESULT)
521 
522 /* 1 if X is a relational operator. */
523 
524 #define COMPARISON_P(X) \
525  ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMPARE_MASK) == RTX_COMPARE_RESULT)
526 
527 /* 1 if X is a constant value that is an integer. */
528 
529 #define CONSTANT_P(X) \
530  (GET_RTX_CLASS (GET_CODE (X)) == RTX_CONST_OBJ)
531 
532 /* 1 if X can be used to represent an object. */
533 #define OBJECT_P(X) \
534  ((GET_RTX_CLASS (GET_CODE (X)) & RTX_OBJ_MASK) == RTX_OBJ_RESULT)
535 
536 /* General accessor macros for accessing the fields of an rtx. */
537 
538 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
539 /* The bit with a star outside the statement expr and an & inside is
540  so that N can be evaluated only once. */
541 #define RTL_CHECK1(RTX, N, C1) __extension__ \
542 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N); \
543  const enum rtx_code _code = GET_CODE (_rtx); \
544  if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
545  rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
546  __FUNCTION__); \
547  if (GET_RTX_FORMAT (_code)[_n] != C1) \
548  rtl_check_failed_type1 (_rtx, _n, C1, __FILE__, __LINE__, \
549  __FUNCTION__); \
550  &_rtx->u.fld[_n]; }))
551 
552 #define RTL_CHECK2(RTX, N, C1, C2) __extension__ \
553 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N); \
554  const enum rtx_code _code = GET_CODE (_rtx); \
555  if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
556  rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
557  __FUNCTION__); \
558  if (GET_RTX_FORMAT (_code)[_n] != C1 \
559  && GET_RTX_FORMAT (_code)[_n] != C2) \
560  rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__, \
561  __FUNCTION__); \
562  &_rtx->u.fld[_n]; }))
563 
564 #define RTL_CHECKC1(RTX, N, C) __extension__ \
565 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N); \
566  if (GET_CODE (_rtx) != (C)) \
567  rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__, \
568  __FUNCTION__); \
569  &_rtx->u.fld[_n]; }))
570 
571 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__ \
572 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N); \
573  const enum rtx_code _code = GET_CODE (_rtx); \
574  if (_code != (C1) && _code != (C2)) \
575  rtl_check_failed_code2 (_rtx, (C1), (C2), __FILE__, __LINE__, \
576  __FUNCTION__); \
577  &_rtx->u.fld[_n]; }))
578 
579 #define RTVEC_ELT(RTVEC, I) __extension__ \
580 (*({ __typeof (RTVEC) const _rtvec = (RTVEC); const int _i = (I); \
581  if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec)) \
582  rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__, \
583  __FUNCTION__); \
584  &_rtvec->elem[_i]; }))
585 
586 #define XWINT(RTX, N) __extension__ \
587 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N); \
588  const enum rtx_code _code = GET_CODE (_rtx); \
589  if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
590  rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
591  __FUNCTION__); \
592  if (GET_RTX_FORMAT (_code)[_n] != 'w') \
593  rtl_check_failed_type1 (_rtx, _n, 'w', __FILE__, __LINE__, \
594  __FUNCTION__); \
595  &_rtx->u.hwint[_n]; }))
596 
597 #define XCWINT(RTX, N, C) __extension__ \
598 (*({ __typeof (RTX) const _rtx = (RTX); \
599  if (GET_CODE (_rtx) != (C)) \
600  rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__, \
601  __FUNCTION__); \
602  &_rtx->u.hwint[N]; }))
603 
604 #define XCMWINT(RTX, N, C, M) __extension__ \
605 (*({ __typeof (RTX) const _rtx = (RTX); \
606  if (GET_CODE (_rtx) != (C) || GET_MODE (_rtx) != (M)) \
607  rtl_check_failed_code_mode (_rtx, (C), (M), false, __FILE__, \
608  __LINE__, __FUNCTION__); \
609  &_rtx->u.hwint[N]; }))
610 
611 #define XCNMPRV(RTX, C, M) __extension__ \
612 ({ __typeof (RTX) const _rtx = (RTX); \
613  if (GET_CODE (_rtx) != (C) || GET_MODE (_rtx) == (M)) \
614  rtl_check_failed_code_mode (_rtx, (C), (M), true, __FILE__, \
615  __LINE__, __FUNCTION__); \
616  &_rtx->u.rv; })
617 
618 #define XCNMPFV(RTX, C, M) __extension__ \
619 ({ __typeof (RTX) const _rtx = (RTX); \
620  if (GET_CODE (_rtx) != (C) || GET_MODE (_rtx) == (M)) \
621  rtl_check_failed_code_mode (_rtx, (C), (M), true, __FILE__, \
622  __LINE__, __FUNCTION__); \
623  &_rtx->u.fv; })
624 
625 #define BLOCK_SYMBOL_CHECK(RTX) __extension__ \
626 ({ __typeof (RTX) const _symbol = (RTX); \
627  const unsigned int flags = RTL_CHECKC1 (_symbol, 1, SYMBOL_REF).rt_int; \
628  if ((flags & SYMBOL_FLAG_HAS_BLOCK_INFO) == 0) \
629  rtl_check_failed_block_symbol (__FILE__, __LINE__, \
630  __FUNCTION__); \
631  &_symbol->u.block_sym; })
632 
633 extern void rtl_check_failed_bounds (const_rtx, int, const char *, int,
634  const char *)
635  ATTRIBUTE_NORETURN;
636 extern void rtl_check_failed_type1 (const_rtx, int, int, const char *, int,
637  const char *)
638  ATTRIBUTE_NORETURN;
639 extern void rtl_check_failed_type2 (const_rtx, int, int, int, const char *,
640  int, const char *)
641  ATTRIBUTE_NORETURN;
642 extern void rtl_check_failed_code1 (const_rtx, enum rtx_code, const char *,
643  int, const char *)
644  ATTRIBUTE_NORETURN;
645 extern void rtl_check_failed_code2 (const_rtx, enum rtx_code, enum rtx_code,
646  const char *, int, const char *)
647  ATTRIBUTE_NORETURN;
648 extern void rtl_check_failed_code_mode (const_rtx, enum rtx_code, enum machine_mode,
649  bool, const char *, int, const char *)
650  ATTRIBUTE_NORETURN;
651 extern void rtl_check_failed_block_symbol (const char *, int, const char *)
652  ATTRIBUTE_NORETURN;
653 extern void rtvec_check_failed_bounds (const_rtvec, int, const char *, int,
654  const char *)
655  ATTRIBUTE_NORETURN;
656 
657 #else /* not ENABLE_RTL_CHECKING */
658 
659 #define RTL_CHECK1(RTX, N, C1) ((RTX)->u.fld[N])
660 #define RTL_CHECK2(RTX, N, C1, C2) ((RTX)->u.fld[N])
661 #define RTL_CHECKC1(RTX, N, C) ((RTX)->u.fld[N])
662 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->u.fld[N])
663 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[I])
664 #define XWINT(RTX, N) ((RTX)->u.hwint[N])
665 #define XCWINT(RTX, N, C) ((RTX)->u.hwint[N])
666 #define XCMWINT(RTX, N, C, M) ((RTX)->u.hwint[N])
667 #define XCNMWINT(RTX, N, C, M) ((RTX)->u.hwint[N])
668 #define XCNMPRV(RTX, C, M) (&(RTX)->u.rv)
669 #define XCNMPFV(RTX, C, M) (&(RTX)->u.fv)
670 #define BLOCK_SYMBOL_CHECK(RTX) (&(RTX)->u.block_sym)
671 
672 #endif
673 
674 /* General accessor macros for accessing the flags of an rtx. */
675 
676 /* Access an individual rtx flag, with no checking of any kind. */
677 #define RTX_FLAG(RTX, FLAG) ((RTX)->FLAG)
678 
679 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION >= 2007)
680 #define RTL_FLAG_CHECK1(NAME, RTX, C1) __extension__ \
681 ({ __typeof (RTX) const _rtx = (RTX); \
682  if (GET_CODE (_rtx) != C1) \
683  rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
684  __FUNCTION__); \
685  _rtx; })
686 
687 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) __extension__ \
688 ({ __typeof (RTX) const _rtx = (RTX); \
689  if (GET_CODE (_rtx) != C1 && GET_CODE(_rtx) != C2) \
690  rtl_check_failed_flag (NAME,_rtx, __FILE__, __LINE__, \
691  __FUNCTION__); \
692  _rtx; })
693 
694 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) __extension__ \
695 ({ __typeof (RTX) const _rtx = (RTX); \
696  if (GET_CODE (_rtx) != C1 && GET_CODE(_rtx) != C2 \
697  && GET_CODE (_rtx) != C3) \
698  rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
699  __FUNCTION__); \
700  _rtx; })
701 
702 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) __extension__ \
703 ({ __typeof (RTX) const _rtx = (RTX); \
704  if (GET_CODE (_rtx) != C1 && GET_CODE(_rtx) != C2 \
705  && GET_CODE (_rtx) != C3 && GET_CODE(_rtx) != C4) \
706  rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
707  __FUNCTION__); \
708  _rtx; })
709 
710 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) __extension__ \
711 ({ __typeof (RTX) const _rtx = (RTX); \
712  if (GET_CODE (_rtx) != C1 && GET_CODE (_rtx) != C2 \
713  && GET_CODE (_rtx) != C3 && GET_CODE (_rtx) != C4 \
714  && GET_CODE (_rtx) != C5) \
715  rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
716  __FUNCTION__); \
717  _rtx; })
718 
719 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6) \
720  __extension__ \
721 ({ __typeof (RTX) const _rtx = (RTX); \
722  if (GET_CODE (_rtx) != C1 && GET_CODE (_rtx) != C2 \
723  && GET_CODE (_rtx) != C3 && GET_CODE (_rtx) != C4 \
724  && GET_CODE (_rtx) != C5 && GET_CODE (_rtx) != C6) \
725  rtl_check_failed_flag (NAME,_rtx, __FILE__, __LINE__, \
726  __FUNCTION__); \
727  _rtx; })
728 
729 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7) \
730  __extension__ \
731 ({ __typeof (RTX) const _rtx = (RTX); \
732  if (GET_CODE (_rtx) != C1 && GET_CODE (_rtx) != C2 \
733  && GET_CODE (_rtx) != C3 && GET_CODE (_rtx) != C4 \
734  && GET_CODE (_rtx) != C5 && GET_CODE (_rtx) != C6 \
735  && GET_CODE (_rtx) != C7) \
736  rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
737  __FUNCTION__); \
738  _rtx; })
739 
740 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8) \
741  __extension__ \
742 ({ __typeof (RTX) const _rtx = (RTX); \
743  if (GET_CODE (_rtx) != C1 && GET_CODE (_rtx) != C2 \
744  && GET_CODE (_rtx) != C3 && GET_CODE (_rtx) != C4 \
745  && GET_CODE (_rtx) != C5 && GET_CODE (_rtx) != C6 \
746  && GET_CODE (_rtx) != C7 && GET_CODE (_rtx) != C8) \
747  rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
748  __FUNCTION__); \
749  _rtx; })
750 
751 extern void rtl_check_failed_flag (const char *, const_rtx, const char *,
752  int, const char *)
753  ATTRIBUTE_NORETURN
754  ;
755 
756 #else /* not ENABLE_RTL_FLAG_CHECKING */
757 
758 #define RTL_FLAG_CHECK1(NAME, RTX, C1) (RTX)
759 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) (RTX)
760 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) (RTX)
761 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) (RTX)
762 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) (RTX)
763 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6) (RTX)
764 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7) (RTX)
765 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8) (RTX)
766 #endif
767 
768 #define XINT(RTX, N) (RTL_CHECK2 (RTX, N, 'i', 'n').rt_int)
769 #define XUINT(RTX, N) (RTL_CHECK2 (RTX, N, 'i', 'n').rt_uint)
770 #define XSTR(RTX, N) (RTL_CHECK2 (RTX, N, 's', 'S').rt_str)
771 #define XEXP(RTX, N) (RTL_CHECK2 (RTX, N, 'e', 'u').rt_rtx)
772 #define XVEC(RTX, N) (RTL_CHECK2 (RTX, N, 'E', 'V').rt_rtvec)
773 #define XMODE(RTX, N) (RTL_CHECK1 (RTX, N, 'M').rt_type)
774 #define XTREE(RTX, N) (RTL_CHECK1 (RTX, N, 't').rt_tree)
775 #define XBBDEF(RTX, N) (RTL_CHECK1 (RTX, N, 'B').rt_bb)
776 #define XTMPL(RTX, N) (RTL_CHECK1 (RTX, N, 'T').rt_str)
777 #define XCFI(RTX, N) (RTL_CHECK1 (RTX, N, 'C').rt_cfi)
778 
779 #define XVECEXP(RTX, N, M) RTVEC_ELT (XVEC (RTX, N), M)
780 #define XVECLEN(RTX, N) GET_NUM_ELEM (XVEC (RTX, N))
781 
782 /* These are like XINT, etc. except that they expect a '0' field instead
783  of the normal type code. */
784 
785 #define X0INT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_int)
786 #define X0UINT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_uint)
787 #define X0STR(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_str)
788 #define X0EXP(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_rtx)
789 #define X0VEC(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_rtvec)
790 #define X0MODE(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_type)
791 #define X0TREE(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_tree)
792 #define X0BBDEF(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_bb)
793 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_addr_diff_vec_flags)
794 #define X0CSELIB(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_cselib)
795 #define X0MEMATTR(RTX, N) (RTL_CHECKC1 (RTX, N, MEM).rt_mem)
796 #define X0REGATTR(RTX, N) (RTL_CHECKC1 (RTX, N, REG).rt_reg)
797 #define X0CONSTANT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_constant)
798 
799 /* Access a '0' field with any type. */
800 #define X0ANY(RTX, N) RTL_CHECK1 (RTX, N, '0')
801 
802 #define XCINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_int)
803 #define XCUINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_uint)
804 #define XCSTR(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_str)
805 #define XCEXP(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_rtx)
806 #define XCVEC(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_rtvec)
807 #define XCMODE(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_type)
808 #define XCTREE(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_tree)
809 #define XCBBDEF(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_bb)
810 #define XCCFI(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_cfi)
811 #define XCCSELIB(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_cselib)
812 
813 #define XCVECEXP(RTX, N, M, C) RTVEC_ELT (XCVEC (RTX, N, C), M)
814 #define XCVECLEN(RTX, N, C) GET_NUM_ELEM (XCVEC (RTX, N, C))
815 
816 #define XC2EXP(RTX, N, C1, C2) (RTL_CHECKC2 (RTX, N, C1, C2).rt_rtx)
817 
818 /* ACCESS MACROS for particular fields of insns. */
819 
820 /* Holds a unique number for each insn.
821  These are not necessarily sequentially increasing. */
822 #define INSN_UID(INSN) XINT (INSN, 0)
823 
824 /* Chain insns together in sequence. */
825 #define PREV_INSN(INSN) XEXP (INSN, 1)
826 #define NEXT_INSN(INSN) XEXP (INSN, 2)
827 
828 #define BLOCK_FOR_INSN(INSN) XBBDEF (INSN, 3)
829 
830 /* The body of an insn. */
831 #define PATTERN(INSN) XEXP (INSN, 4)
832 
833 #define INSN_LOCATION(INSN) XUINT (INSN, 5)
834 
835 #define INSN_HAS_LOCATION(INSN) ((LOCATION_LOCUS (INSN_LOCATION (INSN)))\
836  != UNKNOWN_LOCATION)
837 
838 /* LOCATION of an RTX if relevant. */
839 #define RTL_LOCATION(X) (INSN_P (X) ? \
840  INSN_LOCATION (X) : UNKNOWN_LOCATION)
841 
842 /* Code number of instruction, from when it was recognized.
843  -1 means this instruction has not been recognized yet. */
844 #define INSN_CODE(INSN) XINT (INSN, 6)
845 
846 #define RTX_FRAME_RELATED_P(RTX) \
847  (RTL_FLAG_CHECK6 ("RTX_FRAME_RELATED_P", (RTX), DEBUG_INSN, INSN, \
848  CALL_INSN, JUMP_INSN, BARRIER, SET)->frame_related)
849 
850 /* 1 if RTX is an insn that has been deleted. */
851 #define INSN_DELETED_P(RTX) \
852  (RTL_FLAG_CHECK8 ("INSN_DELETED_P", (RTX), DEBUG_INSN, INSN, \
853  CALL_INSN, JUMP_INSN, JUMP_TABLE_DATA, \
854  CODE_LABEL, BARRIER, NOTE)->volatil)
855 
856 /* 1 if RTX is a call to a const function. Built from ECF_CONST and
857  TREE_READONLY. */
858 #define RTL_CONST_CALL_P(RTX) \
859  (RTL_FLAG_CHECK1 ("RTL_CONST_CALL_P", (RTX), CALL_INSN)->unchanging)
860 
861 /* 1 if RTX is a call to a pure function. Built from ECF_PURE and
862  DECL_PURE_P. */
863 #define RTL_PURE_CALL_P(RTX) \
864  (RTL_FLAG_CHECK1 ("RTL_PURE_CALL_P", (RTX), CALL_INSN)->return_val)
865 
866 /* 1 if RTX is a call to a const or pure function. */
867 #define RTL_CONST_OR_PURE_CALL_P(RTX) \
868  (RTL_CONST_CALL_P (RTX) || RTL_PURE_CALL_P (RTX))
869 
870 /* 1 if RTX is a call to a looping const or pure function. Built from
871  ECF_LOOPING_CONST_OR_PURE and DECL_LOOPING_CONST_OR_PURE_P. */
872 #define RTL_LOOPING_CONST_OR_PURE_CALL_P(RTX) \
873  (RTL_FLAG_CHECK1 ("CONST_OR_PURE_CALL_P", (RTX), CALL_INSN)->call)
874 
875 /* 1 if RTX is a call_insn for a sibling call. */
876 #define SIBLING_CALL_P(RTX) \
877  (RTL_FLAG_CHECK1 ("SIBLING_CALL_P", (RTX), CALL_INSN)->jump)
878 
879 /* 1 if RTX is a jump_insn, call_insn, or insn that is an annulling branch. */
880 #define INSN_ANNULLED_BRANCH_P(RTX) \
881  (RTL_FLAG_CHECK1 ("INSN_ANNULLED_BRANCH_P", (RTX), JUMP_INSN)->unchanging)
882 
883 /* 1 if RTX is an insn in a delay slot and is from the target of the branch.
884  If the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
885  executed if the branch is taken. For annulled branches with this bit
886  clear, the insn should be executed only if the branch is not taken. */
887 #define INSN_FROM_TARGET_P(RTX) \
888  (RTL_FLAG_CHECK3 ("INSN_FROM_TARGET_P", (RTX), INSN, JUMP_INSN, \
889  CALL_INSN)->in_struct)
890 
891 /* In an ADDR_DIFF_VEC, the flags for RTX for use by branch shortening.
892  See the comments for ADDR_DIFF_VEC in rtl.def. */
893 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS (RTX, 4)
894 
895 /* In a VALUE, the value cselib has assigned to RTX.
896  This is a "struct cselib_val_struct", see cselib.h. */
897 #define CSELIB_VAL_PTR(RTX) X0CSELIB (RTX, 0)
898 
899 /* Holds a list of notes on what this insn does to various REGs.
900  It is a chain of EXPR_LIST rtx's, where the second operand is the
901  chain pointer and the first operand is the REG being described.
902  The mode field of the EXPR_LIST contains not a real machine mode
903  but a value from enum reg_note. */
904 #define REG_NOTES(INSN) XEXP(INSN, 7)
905 
906 /* In an ENTRY_VALUE this is the DECL_INCOMING_RTL of the argument in
907  question. */
908 #define ENTRY_VALUE_EXP(RTX) (RTL_CHECKC1 (RTX, 0, ENTRY_VALUE).rt_rtx)
909 
910 enum reg_note
911 {
912 #define DEF_REG_NOTE(NAME) NAME,
913 #include "reg-notes.def"
914 #undef DEF_REG_NOTE
915  REG_NOTE_MAX
916 };
917 
918 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
919 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
920 #define PUT_REG_NOTE_KIND(LINK, KIND) \
921  PUT_MODE (LINK, (enum machine_mode) (KIND))
922 
923 /* Names for REG_NOTE's in EXPR_LIST insn's. */
924 
925 extern const char * const reg_note_name[];
926 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
927 
928 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
929  USE and CLOBBER expressions.
930  USE expressions list the registers filled with arguments that
931  are passed to the function.
932  CLOBBER expressions document the registers explicitly clobbered
933  by this CALL_INSN.
934  Pseudo registers can not be mentioned in this list. */
935 #define CALL_INSN_FUNCTION_USAGE(INSN) XEXP(INSN, 8)
936 
937 /* The label-number of a code-label. The assembler label
938  is made from `L' and the label-number printed in decimal.
939  Label numbers are unique in a compilation. */
940 #define CODE_LABEL_NUMBER(INSN) XINT (INSN, 6)
941 
942 /* In a NOTE that is a line number, this is a string for the file name that the
943  line is in. We use the same field to record block numbers temporarily in
944  NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
945  between ints and pointers if we use a different macro for the block number.)
946  */
947 
948 /* Opaque data. */
949 #define NOTE_DATA(INSN) RTL_CHECKC1 (INSN, 4, NOTE)
950 #define NOTE_DELETED_LABEL_NAME(INSN) XCSTR (INSN, 4, NOTE)
951 #define SET_INSN_DELETED(INSN) set_insn_deleted (INSN);
952 #define NOTE_BLOCK(INSN) XCTREE (INSN, 4, NOTE)
953 #define NOTE_EH_HANDLER(INSN) XCINT (INSN, 4, NOTE)
954 #define NOTE_BASIC_BLOCK(INSN) XCBBDEF (INSN, 4, NOTE)
955 #define NOTE_VAR_LOCATION(INSN) XCEXP (INSN, 4, NOTE)
956 #define NOTE_CFI(INSN) XCCFI (INSN, 4, NOTE)
957 #define NOTE_LABEL_NUMBER(INSN) XCINT (INSN, 4, NOTE)
958 
959 /* In a NOTE that is a line number, this is the line number.
960  Other kinds of NOTEs are identified by negative numbers here. */
961 #define NOTE_KIND(INSN) XCINT (INSN, 5, NOTE)
962 
963 /* Nonzero if INSN is a note marking the beginning of a basic block. */
964 #define NOTE_INSN_BASIC_BLOCK_P(INSN) \
965  (NOTE_P (INSN) && NOTE_KIND (INSN) == NOTE_INSN_BASIC_BLOCK)
966 
967 /* Variable declaration and the location of a variable. */
968 #define PAT_VAR_LOCATION_DECL(PAT) (XCTREE ((PAT), 0, VAR_LOCATION))
969 #define PAT_VAR_LOCATION_LOC(PAT) (XCEXP ((PAT), 1, VAR_LOCATION))
970 
971 /* Initialization status of the variable in the location. Status
972  can be unknown, uninitialized or initialized. See enumeration
973  type below. */
974 #define PAT_VAR_LOCATION_STATUS(PAT) \
975  ((enum var_init_status) (XCINT ((PAT), 2, VAR_LOCATION)))
976 
977 /* Accessors for a NOTE_INSN_VAR_LOCATION. */
978 #define NOTE_VAR_LOCATION_DECL(NOTE) \
979  PAT_VAR_LOCATION_DECL (NOTE_VAR_LOCATION (NOTE))
980 #define NOTE_VAR_LOCATION_LOC(NOTE) \
981  PAT_VAR_LOCATION_LOC (NOTE_VAR_LOCATION (NOTE))
982 #define NOTE_VAR_LOCATION_STATUS(NOTE) \
983  PAT_VAR_LOCATION_STATUS (NOTE_VAR_LOCATION (NOTE))
984 
985 /* The VAR_LOCATION rtx in a DEBUG_INSN. */
986 #define INSN_VAR_LOCATION(INSN) PATTERN (INSN)
987 
988 /* Accessors for a tree-expanded var location debug insn. */
989 #define INSN_VAR_LOCATION_DECL(INSN) \
990  PAT_VAR_LOCATION_DECL (INSN_VAR_LOCATION (INSN))
991 #define INSN_VAR_LOCATION_LOC(INSN) \
992  PAT_VAR_LOCATION_LOC (INSN_VAR_LOCATION (INSN))
993 #define INSN_VAR_LOCATION_STATUS(INSN) \
994  PAT_VAR_LOCATION_STATUS (INSN_VAR_LOCATION (INSN))
995 
996 /* Expand to the RTL that denotes an unknown variable location in a
997  DEBUG_INSN. */
998 #define gen_rtx_UNKNOWN_VAR_LOC() (gen_rtx_CLOBBER (VOIDmode, const0_rtx))
999 
1000 /* Determine whether X is such an unknown location. */
1001 #define VAR_LOC_UNKNOWN_P(X) \
1002  (GET_CODE (X) == CLOBBER && XEXP ((X), 0) == const0_rtx)
1003 
1004 /* 1 if RTX is emitted after a call, but it should take effect before
1005  the call returns. */
1006 #define NOTE_DURING_CALL_P(RTX) \
1007  (RTL_FLAG_CHECK1 ("NOTE_VAR_LOCATION_DURING_CALL_P", (RTX), NOTE)->call)
1008 
1009 /* DEBUG_EXPR_DECL corresponding to a DEBUG_EXPR RTX. */
1010 #define DEBUG_EXPR_TREE_DECL(RTX) XCTREE (RTX, 0, DEBUG_EXPR)
1011 
1012 /* VAR_DECL/PARM_DECL DEBUG_IMPLICIT_PTR takes address of. */
1013 #define DEBUG_IMPLICIT_PTR_DECL(RTX) XCTREE (RTX, 0, DEBUG_IMPLICIT_PTR)
1014 
1015 /* PARM_DECL DEBUG_PARAMETER_REF references. */
1016 #define DEBUG_PARAMETER_REF_DECL(RTX) XCTREE (RTX, 0, DEBUG_PARAMETER_REF)
1017 
1018 /* Codes that appear in the NOTE_KIND field for kinds of notes
1019  that are not line numbers. These codes are all negative.
1020 
1021  Notice that we do not try to use zero here for any of
1022  the special note codes because sometimes the source line
1023  actually can be zero! This happens (for example) when we
1024  are generating code for the per-translation-unit constructor
1025  and destructor routines for some C++ translation unit. */
1026 
1027 enum insn_note
1028 {
1029 #define DEF_INSN_NOTE(NAME) NAME,
1030 #include "insn-notes.def"
1031 #undef DEF_INSN_NOTE
1032 
1033  NOTE_INSN_MAX
1034 };
1035 
1036 /* Names for NOTE insn's other than line numbers. */
1037 
1038 extern const char * const note_insn_name[NOTE_INSN_MAX];
1039 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
1040  (note_insn_name[(NOTE_CODE)])
1041 
1042 /* The name of a label, in case it corresponds to an explicit label
1043  in the input source code. */
1044 #define LABEL_NAME(RTX) XCSTR (RTX, 7, CODE_LABEL)
1045 
1046 /* In jump.c, each label contains a count of the number
1047  of LABEL_REFs that point at it, so unused labels can be deleted. */
1048 #define LABEL_NUSES(RTX) XCINT (RTX, 5, CODE_LABEL)
1049 
1050 /* Labels carry a two-bit field composed of the ->jump and ->call
1051  bits. This field indicates whether the label is an alternate
1052  entry point, and if so, what kind. */
1053 enum label_kind
1054 {
1055  LABEL_NORMAL = 0, /* ordinary label */
1056  LABEL_STATIC_ENTRY, /* alternate entry point, not exported */
1057  LABEL_GLOBAL_ENTRY, /* alternate entry point, exported */
1058  LABEL_WEAK_ENTRY /* alternate entry point, exported as weak symbol */
1059 };
1060 
1061 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION > 2007)
1062 
1063 /* Retrieve the kind of LABEL. */
1064 #define LABEL_KIND(LABEL) __extension__ \
1065 ({ __typeof (LABEL) const _label = (LABEL); \
1066  if (! LABEL_P (_label)) \
1067  rtl_check_failed_flag ("LABEL_KIND", _label, __FILE__, __LINE__, \
1068  __FUNCTION__); \
1069  (enum label_kind) ((_label->jump << 1) | _label->call); })
1070 
1071 /* Set the kind of LABEL. */
1072 #define SET_LABEL_KIND(LABEL, KIND) do { \
1073  __typeof (LABEL) const _label = (LABEL); \
1074  const unsigned int _kind = (KIND); \
1075  if (! LABEL_P (_label)) \
1076  rtl_check_failed_flag ("SET_LABEL_KIND", _label, __FILE__, __LINE__, \
1077  __FUNCTION__); \
1078  _label->jump = ((_kind >> 1) & 1); \
1079  _label->call = (_kind & 1); \
1080 } while (0)
1081 
1082 #else
1083 
1084 /* Retrieve the kind of LABEL. */
1085 #define LABEL_KIND(LABEL) \
1086  ((enum label_kind) (((LABEL)->jump << 1) | (LABEL)->call))
1087 
1088 /* Set the kind of LABEL. */
1089 #define SET_LABEL_KIND(LABEL, KIND) do { \
1090  rtx const _label = (LABEL); \
1091  const unsigned int _kind = (KIND); \
1092  _label->jump = ((_kind >> 1) & 1); \
1093  _label->call = (_kind & 1); \
1094 } while (0)
1095 
1096 #endif /* rtl flag checking */
1097 
1098 #define LABEL_ALT_ENTRY_P(LABEL) (LABEL_KIND (LABEL) != LABEL_NORMAL)
1099 
1100 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
1101  so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
1102  be decremented and possibly the label can be deleted. */
1103 #define JUMP_LABEL(INSN) XCEXP (INSN, 8, JUMP_INSN)
1104 
1105 /* Once basic blocks are found, each CODE_LABEL starts a chain that
1106  goes through all the LABEL_REFs that jump to that label. The chain
1107  eventually winds up at the CODE_LABEL: it is circular. */
1108 #define LABEL_REFS(LABEL) XCEXP (LABEL, 4, CODE_LABEL)
1109 
1110 /* For a REG rtx, REGNO extracts the register number. REGNO can only
1111  be used on RHS. Use SET_REGNO to change the value. */
1112 #define REGNO(RTX) (rhs_regno(RTX))
1113 #define SET_REGNO(RTX,N) \
1114  (df_ref_change_reg_with_loc (REGNO (RTX), N, RTX), XCUINT (RTX, 0, REG) = N)
1115 #define SET_REGNO_RAW(RTX,N) (XCUINT (RTX, 0, REG) = N)
1116 
1117 /* ORIGINAL_REGNO holds the number the register originally had; for a
1118  pseudo register turned into a hard reg this will hold the old pseudo
1119  register number. */
1120 #define ORIGINAL_REGNO(RTX) X0UINT (RTX, 1)
1121 
1122 /* Force the REGNO macro to only be used on the lhs. */
1123 static inline unsigned int
1124 rhs_regno (const_rtx x)
1125 {
1126  return XCUINT (x, 0, REG);
1127 }
1128 
1129 
1130 /* 1 if RTX is a reg or parallel that is the current function's return
1131  value. */
1132 #define REG_FUNCTION_VALUE_P(RTX) \
1133  (RTL_FLAG_CHECK2 ("REG_FUNCTION_VALUE_P", (RTX), REG, PARALLEL)->return_val)
1134 
1135 /* 1 if RTX is a reg that corresponds to a variable declared by the user. */
1136 #define REG_USERVAR_P(RTX) \
1137  (RTL_FLAG_CHECK1 ("REG_USERVAR_P", (RTX), REG)->volatil)
1138 
1139 /* 1 if RTX is a reg that holds a pointer value. */
1140 #define REG_POINTER(RTX) \
1141  (RTL_FLAG_CHECK1 ("REG_POINTER", (RTX), REG)->frame_related)
1142 
1143 /* 1 if RTX is a mem that holds a pointer value. */
1144 #define MEM_POINTER(RTX) \
1145  (RTL_FLAG_CHECK1 ("MEM_POINTER", (RTX), MEM)->frame_related)
1146 
1147 /* 1 if the given register REG corresponds to a hard register. */
1148 #define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
1149 
1150 /* 1 if the given register number REG_NO corresponds to a hard register. */
1151 #define HARD_REGISTER_NUM_P(REG_NO) ((REG_NO) < FIRST_PSEUDO_REGISTER)
1152 
1153 /* For a CONST_INT rtx, INTVAL extracts the integer. */
1154 #define INTVAL(RTX) XCWINT (RTX, 0, CONST_INT)
1155 #define UINTVAL(RTX) ((unsigned HOST_WIDE_INT) INTVAL (RTX))
1156 
1157 /* For a CONST_DOUBLE:
1158  For a VOIDmode, there are two integers CONST_DOUBLE_LOW is the
1159  low-order word and ..._HIGH the high-order.
1160  For a float, there is a REAL_VALUE_TYPE structure, and
1161  CONST_DOUBLE_REAL_VALUE(r) is a pointer to it. */
1162 #define CONST_DOUBLE_LOW(r) XCMWINT (r, 0, CONST_DOUBLE, VOIDmode)
1163 #define CONST_DOUBLE_HIGH(r) XCMWINT (r, 1, CONST_DOUBLE, VOIDmode)
1164 #define CONST_DOUBLE_REAL_VALUE(r) \
1165  ((const struct real_value *) XCNMPRV (r, CONST_DOUBLE, VOIDmode))
1166 
1167 #define CONST_FIXED_VALUE(r) \
1168  ((const struct fixed_value *) XCNMPFV (r, CONST_FIXED, VOIDmode))
1169 #define CONST_FIXED_VALUE_HIGH(r) \
1170  ((HOST_WIDE_INT) (CONST_FIXED_VALUE (r)->data.high))
1171 #define CONST_FIXED_VALUE_LOW(r) \
1172  ((HOST_WIDE_INT) (CONST_FIXED_VALUE (r)->data.low))
1173 
1174 /* For a CONST_VECTOR, return element #n. */
1175 #define CONST_VECTOR_ELT(RTX, N) XCVECEXP (RTX, 0, N, CONST_VECTOR)
1176 
1177 /* For a CONST_VECTOR, return the number of elements in a vector. */
1178 #define CONST_VECTOR_NUNITS(RTX) XCVECLEN (RTX, 0, CONST_VECTOR)
1179 
1180 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
1181  SUBREG_BYTE extracts the byte-number. */
1182 
1183 #define SUBREG_REG(RTX) XCEXP (RTX, 0, SUBREG)
1184 #define SUBREG_BYTE(RTX) XCUINT (RTX, 1, SUBREG)
1185 
1186 /* in rtlanal.c */
1187 /* Return the right cost to give to an operation
1188  to make the cost of the corresponding register-to-register instruction
1189  N times that of a fast register-to-register instruction. */
1190 #define COSTS_N_INSNS(N) ((N) * 4)
1191 
1192 /* Maximum cost of an rtl expression. This value has the special meaning
1193  not to use an rtx with this cost under any circumstances. */
1194 #define MAX_COST INT_MAX
1195 
1196 /* A structure to hold all available cost information about an rtl
1197  expression. */
1198 struct full_rtx_costs
1199 {
1200  int speed;
1201  int size;
1202 };
1203 
1204 /* Initialize a full_rtx_costs structure C to the maximum cost. */
1205 static inline void
1206 init_costs_to_max (struct full_rtx_costs *c)
1207 {
1208  c->speed = MAX_COST;
1209  c->size = MAX_COST;
1210 }
1211 
1212 /* Initialize a full_rtx_costs structure C to zero cost. */
1213 static inline void
1214 init_costs_to_zero (struct full_rtx_costs *c)
1215 {
1216  c->speed = 0;
1217  c->size = 0;
1218 }
1219 
1220 /* Compare two full_rtx_costs structures A and B, returning true
1221  if A < B when optimizing for speed. */
1222 static inline bool
1223 costs_lt_p (struct full_rtx_costs *a, struct full_rtx_costs *b,
1224  bool speed)
1225 {
1226  if (speed)
1227  return (a->speed < b->speed
1228  || (a->speed == b->speed && a->size < b->size));
1229  else
1230  return (a->size < b->size
1231  || (a->size == b->size && a->speed < b->speed));
1232 }
1233 
1234 /* Increase both members of the full_rtx_costs structure C by the
1235  cost of N insns. */
1236 static inline void
1237 costs_add_n_insns (struct full_rtx_costs *c, int n)
1238 {
1239  c->speed += COSTS_N_INSNS (n);
1240  c->size += COSTS_N_INSNS (n);
1241 }
1242 
1243 /* Information about an address. This structure is supposed to be able
1244  to represent all supported target addresses. Please extend it if it
1245  is not yet general enough. */
1246 struct address_info {
1247  /* The mode of the value being addressed, or VOIDmode if this is
1248  a load-address operation with no known address mode. */
1249  enum machine_mode mode;
1250 
1251  /* The address space. */
1252  addr_space_t as;
1253 
1254  /* A pointer to the top-level address. */
1255  rtx *outer;
1256 
1257  /* A pointer to the inner address, after all address mutations
1258  have been stripped from the top-level address. It can be one
1259  of the following:
1260 
1261  - A {PRE,POST}_{INC,DEC} of *BASE. SEGMENT, INDEX and DISP are null.
1262 
1263  - A {PRE,POST}_MODIFY of *BASE. In this case either INDEX or DISP
1264  points to the step value, depending on whether the step is variable
1265  or constant respectively. SEGMENT is null.
1266 
1267  - A plain sum of the form SEGMENT + BASE + INDEX + DISP,
1268  with null fields evaluating to 0. */
1269  rtx *inner;
1270 
1271  /* Components that make up *INNER. Each one may be null or nonnull.
1272  When nonnull, their meanings are as follows:
1273 
1274  - *SEGMENT is the "segment" of memory to which the address refers.
1275  This value is entirely target-specific and is only called a "segment"
1276  because that's its most typical use. It contains exactly one UNSPEC,
1277  pointed to by SEGMENT_TERM. The contents of *SEGMENT do not need
1278  reloading.
1279 
1280  - *BASE is a variable expression representing a base address.
1281  It contains exactly one REG, SUBREG or MEM, pointed to by BASE_TERM.
1282 
1283  - *INDEX is a variable expression representing an index value.
1284  It may be a scaled expression, such as a MULT. It has exactly
1285  one REG, SUBREG or MEM, pointed to by INDEX_TERM.
1286 
1287  - *DISP is a constant, possibly mutated. DISP_TERM points to the
1288  unmutated RTX_CONST_OBJ. */
1289  rtx *segment;
1290  rtx *base;
1291  rtx *index;
1292  rtx *disp;
1293 
1294  rtx *segment_term;
1295  rtx *base_term;
1296  rtx *index_term;
1297  rtx *disp_term;
1298 
1299  /* In a {PRE,POST}_MODIFY address, this points to a second copy
1300  of BASE_TERM, otherwise it is null. */
1301  rtx *base_term2;
1302 
1303  /* ADDRESS if this structure describes an address operand, MEM if
1304  it describes a MEM address. */
1305  enum rtx_code addr_outer_code;
1306 
1307  /* If BASE is nonnull, this is the code of the rtx that contains it. */
1308  enum rtx_code base_outer_code;
1309 
1310  /* True if this is an RTX_AUTOINC address. */
1311  bool autoinc_p;
1312 };
1313 
1314 extern void init_rtlanal (void);
1315 extern int rtx_cost (rtx, enum rtx_code, int, bool);
1316 extern int address_cost (rtx, enum machine_mode, addr_space_t, bool);
1317 extern void get_full_rtx_cost (rtx, enum rtx_code, int,
1318  struct full_rtx_costs *);
1319 extern unsigned int subreg_lsb (const_rtx);
1320 extern unsigned int subreg_lsb_1 (enum machine_mode, enum machine_mode,
1321  unsigned int);
1322 extern unsigned int subreg_regno_offset (unsigned int, enum machine_mode,
1323  unsigned int, enum machine_mode);
1324 extern bool subreg_offset_representable_p (unsigned int, enum machine_mode,
1325  unsigned int, enum machine_mode);
1326 extern unsigned int subreg_regno (const_rtx);
1327 extern int simplify_subreg_regno (unsigned int, enum machine_mode,
1328  unsigned int, enum machine_mode);
1329 extern unsigned int subreg_nregs (const_rtx);
1330 extern unsigned int subreg_nregs_with_regno (unsigned int, const_rtx);
1331 extern unsigned HOST_WIDE_INT nonzero_bits (const_rtx, enum machine_mode);
1332 extern unsigned int num_sign_bit_copies (const_rtx, enum machine_mode);
1333 extern bool constant_pool_constant_p (rtx);
1334 extern bool truncated_to_mode (enum machine_mode, const_rtx);
1335 extern int low_bitmask_len (enum machine_mode, unsigned HOST_WIDE_INT);
1336 extern void split_double (rtx, rtx *, rtx *);
1337 extern rtx *strip_address_mutations (rtx *, enum rtx_code * = 0);
1338 extern void decompose_address (struct address_info *, rtx *,
1339  enum machine_mode, addr_space_t, enum rtx_code);
1340 extern void decompose_lea_address (struct address_info *, rtx *);
1341 extern void decompose_mem_address (struct address_info *, rtx);
1342 extern void update_address (struct address_info *);
1343 extern HOST_WIDE_INT get_index_scale (const struct address_info *);
1344 extern enum rtx_code get_index_code (const struct address_info *);
1345 
1346 #ifndef GENERATOR_FILE
1347 /* Return the cost of SET X. SPEED_P is true if optimizing for speed
1348  rather than size. */
1349 
1350 static inline int
1351 set_rtx_cost (rtx x, bool speed_p)
1352 {
1353  return rtx_cost (x, INSN, 4, speed_p);
1354 }
1355 
1356 /* Like set_rtx_cost, but return both the speed and size costs in C. */
1357 
1358 static inline void
1359 get_full_set_rtx_cost (rtx x, struct full_rtx_costs *c)
1360 {
1361  get_full_rtx_cost (x, INSN, 4, c);
1362 }
1363 
1364 /* Return the cost of moving X into a register, relative to the cost
1365  of a register move. SPEED_P is true if optimizing for speed rather
1366  than size. */
1367 
1368 static inline int
1369 set_src_cost (rtx x, bool speed_p)
1370 {
1371  return rtx_cost (x, SET, 1, speed_p);
1372 }
1373 
1374 /* Like set_src_cost, but return both the speed and size costs in C. */
1375 
1376 static inline void
1377 get_full_set_src_cost (rtx x, struct full_rtx_costs *c)
1378 {
1379  get_full_rtx_cost (x, SET, 1, c);
1380 }
1381 #endif
1382 
1383 /* 1 if RTX is a subreg containing a reg that is already known to be
1384  sign- or zero-extended from the mode of the subreg to the mode of
1385  the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
1386  extension.
1387 
1388  When used as a LHS, is means that this extension must be done
1389  when assigning to SUBREG_REG. */
1390 
1391 #define SUBREG_PROMOTED_VAR_P(RTX) \
1392  (RTL_FLAG_CHECK1 ("SUBREG_PROMOTED", (RTX), SUBREG)->in_struct)
1393 
1394 #define SUBREG_PROMOTED_UNSIGNED_SET(RTX, VAL) \
1395 do { \
1396  rtx const _rtx = RTL_FLAG_CHECK1 ("SUBREG_PROMOTED_UNSIGNED_SET", \
1397  (RTX), SUBREG); \
1398  if ((VAL) < 0) \
1399  _rtx->volatil = 1; \
1400  else { \
1401  _rtx->volatil = 0; \
1402  _rtx->unchanging = (VAL); \
1403  } \
1404 } while (0)
1405 
1406 /* Valid for subregs which are SUBREG_PROMOTED_VAR_P(). In that case
1407  this gives the necessary extensions:
1408  0 - signed
1409  1 - normal unsigned
1410  -1 - pointer unsigned, which most often can be handled like unsigned
1411  extension, except for generating instructions where we need to
1412  emit special code (ptr_extend insns) on some architectures. */
1413 
1414 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) \
1415  ((RTL_FLAG_CHECK1 ("SUBREG_PROMOTED_UNSIGNED_P", (RTX), SUBREG)->volatil) \
1416  ? -1 : (int) (RTX)->unchanging)
1417 
1418 /* True if the subreg was generated by LRA for reload insns. Such
1419  subregs are valid only during LRA. */
1420 #define LRA_SUBREG_P(RTX) \
1421  (RTL_FLAG_CHECK1 ("LRA_SUBREG_P", (RTX), SUBREG)->jump)
1422 
1423 /* Access various components of an ASM_OPERANDS rtx. */
1424 
1425 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR (RTX, 0, ASM_OPERANDS)
1426 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR (RTX, 1, ASM_OPERANDS)
1427 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT (RTX, 2, ASM_OPERANDS)
1428 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC (RTX, 3, ASM_OPERANDS)
1429 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC (RTX, 4, ASM_OPERANDS)
1430 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP (RTX, 3, N, ASM_OPERANDS)
1431 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN (RTX, 3, ASM_OPERANDS)
1432 #define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
1433  XCVECEXP (RTX, 4, N, ASM_OPERANDS)
1434 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
1435  XSTR (XCVECEXP (RTX, 4, N, ASM_OPERANDS), 0)
1436 #define ASM_OPERANDS_INPUT_MODE(RTX, N) \
1437  GET_MODE (XCVECEXP (RTX, 4, N, ASM_OPERANDS))
1438 #define ASM_OPERANDS_LABEL_VEC(RTX) XCVEC (RTX, 5, ASM_OPERANDS)
1439 #define ASM_OPERANDS_LABEL_LENGTH(RTX) XCVECLEN (RTX, 5, ASM_OPERANDS)
1440 #define ASM_OPERANDS_LABEL(RTX, N) XCVECEXP (RTX, 5, N, ASM_OPERANDS)
1441 #define ASM_OPERANDS_SOURCE_LOCATION(RTX) XCUINT (RTX, 6, ASM_OPERANDS)
1442 #define ASM_INPUT_SOURCE_LOCATION(RTX) XCUINT (RTX, 1, ASM_INPUT)
1443 
1444 /* 1 if RTX is a mem that is statically allocated in read-only memory. */
1445 #define MEM_READONLY_P(RTX) \
1446  (RTL_FLAG_CHECK1 ("MEM_READONLY_P", (RTX), MEM)->unchanging)
1447 
1448 /* 1 if RTX is a mem and we should keep the alias set for this mem
1449  unchanged when we access a component. Set to 1, or example, when we
1450  are already in a non-addressable component of an aggregate. */
1451 #define MEM_KEEP_ALIAS_SET_P(RTX) \
1452  (RTL_FLAG_CHECK1 ("MEM_KEEP_ALIAS_SET_P", (RTX), MEM)->jump)
1453 
1454 /* 1 if RTX is a mem or asm_operand for a volatile reference. */
1455 #define MEM_VOLATILE_P(RTX) \
1456  (RTL_FLAG_CHECK3 ("MEM_VOLATILE_P", (RTX), MEM, ASM_OPERANDS, \
1457  ASM_INPUT)->volatil)
1458 
1459 /* 1 if RTX is a mem that cannot trap. */
1460 #define MEM_NOTRAP_P(RTX) \
1461  (RTL_FLAG_CHECK1 ("MEM_NOTRAP_P", (RTX), MEM)->call)
1462 
1463 /* The memory attribute block. We provide access macros for each value
1464  in the block and provide defaults if none specified. */
1465 #define MEM_ATTRS(RTX) X0MEMATTR (RTX, 1)
1466 
1467 /* The register attribute block. We provide access macros for each value
1468  in the block and provide defaults if none specified. */
1469 #define REG_ATTRS(RTX) X0REGATTR (RTX, 2)
1470 
1471 #ifndef GENERATOR_FILE
1472 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
1473  set, and may alias anything. Otherwise, the MEM can only alias
1474  MEMs in a conflicting alias set. This value is set in a
1475  language-dependent manner in the front-end, and should not be
1476  altered in the back-end. These set numbers are tested with
1477  alias_sets_conflict_p. */
1478 #define MEM_ALIAS_SET(RTX) (get_mem_attrs (RTX)->alias)
1479 
1480 /* For a MEM rtx, the decl it is known to refer to, if it is known to
1481  refer to part of a DECL. It may also be a COMPONENT_REF. */
1482 #define MEM_EXPR(RTX) (get_mem_attrs (RTX)->expr)
1483 
1484 /* For a MEM rtx, true if its MEM_OFFSET is known. */
1485 #define MEM_OFFSET_KNOWN_P(RTX) (get_mem_attrs (RTX)->offset_known_p)
1486 
1487 /* For a MEM rtx, the offset from the start of MEM_EXPR. */
1488 #define MEM_OFFSET(RTX) (get_mem_attrs (RTX)->offset)
1489 
1490 /* For a MEM rtx, the address space. */
1491 #define MEM_ADDR_SPACE(RTX) (get_mem_attrs (RTX)->addrspace)
1492 
1493 /* For a MEM rtx, true if its MEM_SIZE is known. */
1494 #define MEM_SIZE_KNOWN_P(RTX) (get_mem_attrs (RTX)->size_known_p)
1495 
1496 /* For a MEM rtx, the size in bytes of the MEM. */
1497 #define MEM_SIZE(RTX) (get_mem_attrs (RTX)->size)
1498 
1499 /* For a MEM rtx, the alignment in bits. We can use the alignment of the
1500  mode as a default when STRICT_ALIGNMENT, but not if not. */
1501 #define MEM_ALIGN(RTX) (get_mem_attrs (RTX)->align)
1502 #else
1503 #define MEM_ADDR_SPACE(RTX) ADDR_SPACE_GENERIC
1504 #endif
1505 
1506 /* For a REG rtx, the decl it is known to refer to, if it is known to
1507  refer to part of a DECL. */
1508 #define REG_EXPR(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->decl)
1509 
1510 /* For a REG rtx, the offset from the start of REG_EXPR, if known, as an
1511  HOST_WIDE_INT. */
1512 #define REG_OFFSET(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->offset)
1513 
1514 /* Copy the attributes that apply to memory locations from RHS to LHS. */
1515 #define MEM_COPY_ATTRIBUTES(LHS, RHS) \
1516  (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
1517  MEM_NOTRAP_P (LHS) = MEM_NOTRAP_P (RHS), \
1518  MEM_READONLY_P (LHS) = MEM_READONLY_P (RHS), \
1519  MEM_KEEP_ALIAS_SET_P (LHS) = MEM_KEEP_ALIAS_SET_P (RHS), \
1520  MEM_POINTER (LHS) = MEM_POINTER (RHS), \
1521  MEM_ATTRS (LHS) = MEM_ATTRS (RHS))
1522 
1523 /* 1 if RTX is a label_ref for a nonlocal label. */
1524 /* Likewise in an expr_list for a REG_LABEL_OPERAND or
1525  REG_LABEL_TARGET note. */
1526 #define LABEL_REF_NONLOCAL_P(RTX) \
1527  (RTL_FLAG_CHECK1 ("LABEL_REF_NONLOCAL_P", (RTX), LABEL_REF)->volatil)
1528 
1529 /* 1 if RTX is a code_label that should always be considered to be needed. */
1530 #define LABEL_PRESERVE_P(RTX) \
1531  (RTL_FLAG_CHECK2 ("LABEL_PRESERVE_P", (RTX), CODE_LABEL, NOTE)->in_struct)
1532 
1533 /* During sched, 1 if RTX is an insn that must be scheduled together
1534  with the preceding insn. */
1535 #define SCHED_GROUP_P(RTX) \
1536  (RTL_FLAG_CHECK4 ("SCHED_GROUP_P", (RTX), DEBUG_INSN, INSN, \
1537  JUMP_INSN, CALL_INSN)->in_struct)
1538 
1539 /* For a SET rtx, SET_DEST is the place that is set
1540  and SET_SRC is the value it is set to. */
1541 #define SET_DEST(RTX) XC2EXP (RTX, 0, SET, CLOBBER)
1542 #define SET_SRC(RTX) XCEXP (RTX, 1, SET)
1543 #define SET_IS_RETURN_P(RTX) \
1544  (RTL_FLAG_CHECK1 ("SET_IS_RETURN_P", (RTX), SET)->jump)
1545 
1546 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
1547 #define TRAP_CONDITION(RTX) XCEXP (RTX, 0, TRAP_IF)
1548 #define TRAP_CODE(RTX) XCEXP (RTX, 1, TRAP_IF)
1549 
1550 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
1551  conditionally executing the code on, COND_EXEC_CODE is the code
1552  to execute if the condition is true. */
1553 #define COND_EXEC_TEST(RTX) XCEXP (RTX, 0, COND_EXEC)
1554 #define COND_EXEC_CODE(RTX) XCEXP (RTX, 1, COND_EXEC)
1555 
1556 /* 1 if RTX is a symbol_ref that addresses this function's rtl
1557  constants pool. */
1558 #define CONSTANT_POOL_ADDRESS_P(RTX) \
1559  (RTL_FLAG_CHECK1 ("CONSTANT_POOL_ADDRESS_P", (RTX), SYMBOL_REF)->unchanging)
1560 
1561 /* 1 if RTX is a symbol_ref that addresses a value in the file's
1562  tree constant pool. This information is private to varasm.c. */
1563 #define TREE_CONSTANT_POOL_ADDRESS_P(RTX) \
1564  (RTL_FLAG_CHECK1 ("TREE_CONSTANT_POOL_ADDRESS_P", \
1565  (RTX), SYMBOL_REF)->frame_related)
1566 
1567 /* Used if RTX is a symbol_ref, for machine-specific purposes. */
1568 #define SYMBOL_REF_FLAG(RTX) \
1569  (RTL_FLAG_CHECK1 ("SYMBOL_REF_FLAG", (RTX), SYMBOL_REF)->volatil)
1570 
1571 /* 1 if RTX is a symbol_ref that has been the library function in
1572  emit_library_call. */
1573 #define SYMBOL_REF_USED(RTX) \
1574  (RTL_FLAG_CHECK1 ("SYMBOL_REF_USED", (RTX), SYMBOL_REF)->used)
1575 
1576 /* 1 if RTX is a symbol_ref for a weak symbol. */
1577 #define SYMBOL_REF_WEAK(RTX) \
1578  (RTL_FLAG_CHECK1 ("SYMBOL_REF_WEAK", (RTX), SYMBOL_REF)->return_val)
1579 
1580 /* A pointer attached to the SYMBOL_REF; either SYMBOL_REF_DECL or
1581  SYMBOL_REF_CONSTANT. */
1582 #define SYMBOL_REF_DATA(RTX) X0ANY ((RTX), 2)
1583 
1584 /* Set RTX's SYMBOL_REF_DECL to DECL. RTX must not be a constant
1585  pool symbol. */
1586 #define SET_SYMBOL_REF_DECL(RTX, DECL) \
1587  (gcc_assert (!CONSTANT_POOL_ADDRESS_P (RTX)), X0TREE ((RTX), 2) = (DECL))
1588 
1589 /* The tree (decl or constant) associated with the symbol, or null. */
1590 #define SYMBOL_REF_DECL(RTX) \
1591  (CONSTANT_POOL_ADDRESS_P (RTX) ? NULL : X0TREE ((RTX), 2))
1592 
1593 /* Set RTX's SYMBOL_REF_CONSTANT to C. RTX must be a constant pool symbol. */
1594 #define SET_SYMBOL_REF_CONSTANT(RTX, C) \
1595  (gcc_assert (CONSTANT_POOL_ADDRESS_P (RTX)), X0CONSTANT ((RTX), 2) = (C))
1596 
1597 /* The rtx constant pool entry for a symbol, or null. */
1598 #define SYMBOL_REF_CONSTANT(RTX) \
1599  (CONSTANT_POOL_ADDRESS_P (RTX) ? X0CONSTANT ((RTX), 2) : NULL)
1600 
1601 /* A set of flags on a symbol_ref that are, in some respects, redundant with
1602  information derivable from the tree decl associated with this symbol.
1603  Except that we build a *lot* of SYMBOL_REFs that aren't associated with a
1604  decl. In some cases this is a bug. But beyond that, it's nice to cache
1605  this information to avoid recomputing it. Finally, this allows space for
1606  the target to store more than one bit of information, as with
1607  SYMBOL_REF_FLAG. */
1608 #define SYMBOL_REF_FLAGS(RTX) X0INT ((RTX), 1)
1609 
1610 /* These flags are common enough to be defined for all targets. They
1611  are computed by the default version of targetm.encode_section_info. */
1612 
1613 /* Set if this symbol is a function. */
1614 #define SYMBOL_FLAG_FUNCTION (1 << 0)
1615 #define SYMBOL_REF_FUNCTION_P(RTX) \
1616  ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_FUNCTION) != 0)
1617 /* Set if targetm.binds_local_p is true. */
1618 #define SYMBOL_FLAG_LOCAL (1 << 1)
1619 #define SYMBOL_REF_LOCAL_P(RTX) \
1620  ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_LOCAL) != 0)
1621 /* Set if targetm.in_small_data_p is true. */
1622 #define SYMBOL_FLAG_SMALL (1 << 2)
1623 #define SYMBOL_REF_SMALL_P(RTX) \
1624  ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_SMALL) != 0)
1625 /* The three-bit field at [5:3] is true for TLS variables; use
1626  SYMBOL_REF_TLS_MODEL to extract the field as an enum tls_model. */
1627 #define SYMBOL_FLAG_TLS_SHIFT 3
1628 #define SYMBOL_REF_TLS_MODEL(RTX) \
1629  ((enum tls_model) ((SYMBOL_REF_FLAGS (RTX) >> SYMBOL_FLAG_TLS_SHIFT) & 7))
1630 /* Set if this symbol is not defined in this translation unit. */
1631 #define SYMBOL_FLAG_EXTERNAL (1 << 6)
1632 #define SYMBOL_REF_EXTERNAL_P(RTX) \
1633  ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_EXTERNAL) != 0)
1634 /* Set if this symbol has a block_symbol structure associated with it. */
1635 #define SYMBOL_FLAG_HAS_BLOCK_INFO (1 << 7)
1636 #define SYMBOL_REF_HAS_BLOCK_INFO_P(RTX) \
1637  ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_HAS_BLOCK_INFO) != 0)
1638 /* Set if this symbol is a section anchor. SYMBOL_REF_ANCHOR_P implies
1639  SYMBOL_REF_HAS_BLOCK_INFO_P. */
1640 #define SYMBOL_FLAG_ANCHOR (1 << 8)
1641 #define SYMBOL_REF_ANCHOR_P(RTX) \
1642  ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_ANCHOR) != 0)
1643 
1644 /* Subsequent bits are available for the target to use. */
1645 #define SYMBOL_FLAG_MACH_DEP_SHIFT 9
1646 #define SYMBOL_FLAG_MACH_DEP (1 << SYMBOL_FLAG_MACH_DEP_SHIFT)
1647 
1648 /* If SYMBOL_REF_HAS_BLOCK_INFO_P (RTX), this is the object_block
1649  structure to which the symbol belongs, or NULL if it has not been
1650  assigned a block. */
1651 #define SYMBOL_REF_BLOCK(RTX) (BLOCK_SYMBOL_CHECK (RTX)->block)
1652 
1653 /* If SYMBOL_REF_HAS_BLOCK_INFO_P (RTX), this is the offset of RTX from
1654  the first object in SYMBOL_REF_BLOCK (RTX). The value is negative if
1655  RTX has not yet been assigned to a block, or it has not been given an
1656  offset within that block. */
1657 #define SYMBOL_REF_BLOCK_OFFSET(RTX) (BLOCK_SYMBOL_CHECK (RTX)->offset)
1658 
1659 /* True if RTX is flagged to be a scheduling barrier. */
1660 #define PREFETCH_SCHEDULE_BARRIER_P(RTX) \
1661  (RTL_FLAG_CHECK1 ("PREFETCH_SCHEDULE_BARRIER_P", (RTX), PREFETCH)->volatil)
1662 
1663 /* Indicate whether the machine has any sort of auto increment addressing.
1664  If not, we can avoid checking for REG_INC notes. */
1665 
1666 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) \
1667  || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT) \
1668  || defined (HAVE_PRE_MODIFY_DISP) || defined (HAVE_POST_MODIFY_DISP) \
1669  || defined (HAVE_PRE_MODIFY_REG) || defined (HAVE_POST_MODIFY_REG))
1670 #define AUTO_INC_DEC
1671 #endif
1672 
1673 /* Define a macro to look for REG_INC notes,
1674  but save time on machines where they never exist. */
1675 
1676 #ifdef AUTO_INC_DEC
1677 #define FIND_REG_INC_NOTE(INSN, REG) \
1678  ((REG) != NULL_RTX && REG_P ((REG)) \
1679  ? find_regno_note ((INSN), REG_INC, REGNO (REG)) \
1680  : find_reg_note ((INSN), REG_INC, (REG)))
1681 #else
1682 #define FIND_REG_INC_NOTE(INSN, REG) 0
1683 #endif
1684 
1685 #ifndef HAVE_PRE_INCREMENT
1686 #define HAVE_PRE_INCREMENT 0
1687 #endif
1688 
1689 #ifndef HAVE_PRE_DECREMENT
1690 #define HAVE_PRE_DECREMENT 0
1691 #endif
1692 
1693 #ifndef HAVE_POST_INCREMENT
1694 #define HAVE_POST_INCREMENT 0
1695 #endif
1696 
1697 #ifndef HAVE_POST_DECREMENT
1698 #define HAVE_POST_DECREMENT 0
1699 #endif
1700 
1701 #ifndef HAVE_POST_MODIFY_DISP
1702 #define HAVE_POST_MODIFY_DISP 0
1703 #endif
1704 
1705 #ifndef HAVE_POST_MODIFY_REG
1706 #define HAVE_POST_MODIFY_REG 0
1707 #endif
1708 
1709 #ifndef HAVE_PRE_MODIFY_DISP
1710 #define HAVE_PRE_MODIFY_DISP 0
1711 #endif
1712 
1713 #ifndef HAVE_PRE_MODIFY_REG
1714 #define HAVE_PRE_MODIFY_REG 0
1715 #endif
1716 
1717 
1718 /* Some architectures do not have complete pre/post increment/decrement
1719  instruction sets, or only move some modes efficiently. These macros
1720  allow us to tune autoincrement generation. */
1721 
1722 #ifndef USE_LOAD_POST_INCREMENT
1723 #define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1724 #endif
1725 
1726 #ifndef USE_LOAD_POST_DECREMENT
1727 #define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1728 #endif
1729 
1730 #ifndef USE_LOAD_PRE_INCREMENT
1731 #define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1732 #endif
1733 
1734 #ifndef USE_LOAD_PRE_DECREMENT
1735 #define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1736 #endif
1737 
1738 #ifndef USE_STORE_POST_INCREMENT
1739 #define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1740 #endif
1741 
1742 #ifndef USE_STORE_POST_DECREMENT
1743 #define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1744 #endif
1745 
1746 #ifndef USE_STORE_PRE_INCREMENT
1747 #define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1748 #endif
1749 
1750 #ifndef USE_STORE_PRE_DECREMENT
1751 #define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1752 #endif
1753 
1754 /* Nonzero when we are generating CONCATs. */
1755 extern int generating_concat_p;
1756 
1757 /* Nonzero when we are expanding trees to RTL. */
1758 extern int currently_expanding_to_rtl;
1759 
1760 /* Generally useful functions. */
1761 
1762 /* In explow.c */
1763 extern HOST_WIDE_INT trunc_int_for_mode (HOST_WIDE_INT, enum machine_mode);
1764 extern rtx plus_constant (enum machine_mode, rtx, HOST_WIDE_INT);
1765 
1766 /* In rtl.c */
1767 extern rtx rtx_alloc_stat (RTX_CODE MEM_STAT_DECL);
1768 #define rtx_alloc(c) rtx_alloc_stat (c MEM_STAT_INFO)
1769 
1770 extern rtvec rtvec_alloc (int);
1771 extern rtvec shallow_copy_rtvec (rtvec);
1772 extern bool shared_const_p (const_rtx);
1773 extern rtx copy_rtx (rtx);
1774 extern void dump_rtx_statistics (void);
1775 
1776 /* In emit-rtl.c */
1777 extern rtx copy_rtx_if_shared (rtx);
1778 
1779 /* In rtl.c */
1780 extern unsigned int rtx_size (const_rtx);
1781 extern rtx shallow_copy_rtx_stat (const_rtx MEM_STAT_DECL);
1782 #define shallow_copy_rtx(a) shallow_copy_rtx_stat (a MEM_STAT_INFO)
1783 extern int rtx_equal_p (const_rtx, const_rtx);
1784 extern hashval_t iterative_hash_rtx (const_rtx, hashval_t);
1785 
1786 /* In emit-rtl.c */
1787 extern rtvec gen_rtvec_v (int, rtx *);
1788 extern rtx gen_reg_rtx (enum machine_mode);
1789 extern rtx gen_rtx_REG_offset (rtx, enum machine_mode, unsigned int, int);
1790 extern rtx gen_reg_rtx_offset (rtx, enum machine_mode, int);
1791 extern rtx gen_reg_rtx_and_attrs (rtx);
1792 extern rtx gen_label_rtx (void);
1793 extern rtx gen_lowpart_common (enum machine_mode, rtx);
1794 
1795 /* In cse.c */
1796 extern rtx gen_lowpart_if_possible (enum machine_mode, rtx);
1797 
1798 /* In emit-rtl.c */
1799 extern rtx gen_highpart (enum machine_mode, rtx);
1800 extern rtx gen_highpart_mode (enum machine_mode, enum machine_mode, rtx);
1801 extern rtx operand_subword (rtx, unsigned int, int, enum machine_mode);
1802 
1803 /* In emit-rtl.c */
1804 extern rtx operand_subword_force (rtx, unsigned int, enum machine_mode);
1805 extern bool paradoxical_subreg_p (const_rtx);
1806 extern int subreg_lowpart_p (const_rtx);
1807 extern unsigned int subreg_lowpart_offset (enum machine_mode,
1808  enum machine_mode);
1809 extern unsigned int subreg_highpart_offset (enum machine_mode,
1810  enum machine_mode);
1811 extern int byte_lowpart_offset (enum machine_mode, enum machine_mode);
1812 extern rtx make_safe_from (rtx, rtx);
1813 extern rtx convert_memory_address_addr_space (enum machine_mode, rtx,
1814  addr_space_t);
1815 #define convert_memory_address(to_mode,x) \
1816  convert_memory_address_addr_space ((to_mode), (x), ADDR_SPACE_GENERIC)
1817 extern const char *get_insn_name (int);
1818 extern rtx get_last_insn_anywhere (void);
1819 extern rtx get_first_nonnote_insn (void);
1820 extern rtx get_last_nonnote_insn (void);
1821 extern void start_sequence (void);
1822 extern void push_to_sequence (rtx);
1823 extern void push_to_sequence2 (rtx, rtx);
1824 extern void end_sequence (void);
1825 extern double_int rtx_to_double_int (const_rtx);
1826 extern rtx immed_double_int_const (double_int, enum machine_mode);
1827 extern rtx immed_double_const (HOST_WIDE_INT, HOST_WIDE_INT,
1828  enum machine_mode);
1829 
1830 /* In loop-iv.c */
1831 
1832 extern rtx lowpart_subreg (enum machine_mode, rtx, enum machine_mode);
1833 
1834 /* In varasm.c */
1835 extern rtx force_const_mem (enum machine_mode, rtx);
1836 
1837 /* In varasm.c */
1838 
1839 struct function;
1840 extern rtx get_pool_constant (rtx);
1841 extern rtx get_pool_constant_mark (rtx, bool *);
1842 extern enum machine_mode get_pool_mode (const_rtx);
1843 extern rtx simplify_subtraction (rtx);
1844 extern void decide_function_section (tree);
1845 
1846 /* In function.c */
1847 extern rtx assign_stack_local (enum machine_mode, HOST_WIDE_INT, int);
1848 #define ASLK_REDUCE_ALIGN 1
1849 #define ASLK_RECORD_PAD 2
1850 extern rtx assign_stack_local_1 (enum machine_mode, HOST_WIDE_INT, int, int);
1851 extern rtx assign_stack_temp (enum machine_mode, HOST_WIDE_INT);
1852 extern rtx assign_stack_temp_for_type (enum machine_mode, HOST_WIDE_INT, tree);
1853 extern rtx assign_temp (tree, int, int);
1854 
1855 /* In emit-rtl.c */
1856 extern rtx emit_insn_before (rtx, rtx);
1857 extern rtx emit_insn_before_noloc (rtx, rtx, basic_block);
1858 extern rtx emit_insn_before_setloc (rtx, rtx, int);
1859 extern rtx emit_jump_insn_before (rtx, rtx);
1860 extern rtx emit_jump_insn_before_noloc (rtx, rtx);
1861 extern rtx emit_jump_insn_before_setloc (rtx, rtx, int);
1862 extern rtx emit_call_insn_before (rtx, rtx);
1863 extern rtx emit_call_insn_before_noloc (rtx, rtx);
1864 extern rtx emit_call_insn_before_setloc (rtx, rtx, int);
1865 extern rtx emit_debug_insn_before (rtx, rtx);
1866 extern rtx emit_debug_insn_before_noloc (rtx, rtx);
1867 extern rtx emit_debug_insn_before_setloc (rtx, rtx, int);
1868 extern rtx emit_barrier_before (rtx);
1869 extern rtx emit_label_before (rtx, rtx);
1870 extern rtx emit_note_before (enum insn_note, rtx);
1871 extern rtx emit_insn_after (rtx, rtx);
1872 extern rtx emit_insn_after_noloc (rtx, rtx, basic_block);
1873 extern rtx emit_insn_after_setloc (rtx, rtx, int);
1874 extern rtx emit_jump_insn_after (rtx, rtx);
1875 extern rtx emit_jump_insn_after_noloc (rtx, rtx);
1876 extern rtx emit_jump_insn_after_setloc (rtx, rtx, int);
1877 extern rtx emit_call_insn_after (rtx, rtx);
1878 extern rtx emit_call_insn_after_noloc (rtx, rtx);
1879 extern rtx emit_call_insn_after_setloc (rtx, rtx, int);
1880 extern rtx emit_debug_insn_after (rtx, rtx);
1881 extern rtx emit_debug_insn_after_noloc (rtx, rtx);
1882 extern rtx emit_debug_insn_after_setloc (rtx, rtx, int);
1883 extern rtx emit_barrier_after (rtx);
1884 extern rtx emit_label_after (rtx, rtx);
1885 extern rtx emit_note_after (enum insn_note, rtx);
1886 extern rtx emit_insn (rtx);
1887 extern rtx emit_debug_insn (rtx);
1888 extern rtx emit_jump_insn (rtx);
1889 extern rtx emit_call_insn (rtx);
1890 extern rtx emit_label (rtx);
1891 extern rtx emit_jump_table_data (rtx);
1892 extern rtx emit_barrier (void);
1893 extern rtx emit_note (enum insn_note);
1894 extern rtx emit_note_copy (rtx);
1895 extern rtx gen_clobber (rtx);
1896 extern rtx emit_clobber (rtx);
1897 extern rtx gen_use (rtx);
1898 extern rtx emit_use (rtx);
1899 extern rtx make_insn_raw (rtx);
1900 extern void add_function_usage_to (rtx, rtx);
1901 extern rtx last_call_insn (void);
1902 extern rtx previous_insn (rtx);
1903 extern rtx next_insn (rtx);
1904 extern rtx prev_nonnote_insn (rtx);
1905 extern rtx prev_nonnote_insn_bb (rtx);
1906 extern rtx next_nonnote_insn (rtx);
1907 extern rtx next_nonnote_insn_bb (rtx);
1908 extern rtx prev_nondebug_insn (rtx);
1909 extern rtx next_nondebug_insn (rtx);
1910 extern rtx prev_nonnote_nondebug_insn (rtx);
1911 extern rtx next_nonnote_nondebug_insn (rtx);
1912 extern rtx prev_real_insn (rtx);
1913 extern rtx next_real_insn (rtx);
1914 extern rtx prev_active_insn (rtx);
1915 extern rtx next_active_insn (rtx);
1916 extern int active_insn_p (const_rtx);
1917 extern rtx next_cc0_user (rtx);
1918 extern rtx prev_cc0_setter (rtx);
1919 
1920 /* In emit-rtl.c */
1921 extern int insn_line (const_rtx);
1922 extern const char * insn_file (const_rtx);
1923 extern tree insn_scope (const_rtx);
1924 extern location_t prologue_location, epilogue_location;
1925 
1926 /* In jump.c */
1927 extern enum rtx_code reverse_condition (enum rtx_code);
1928 extern enum rtx_code reverse_condition_maybe_unordered (enum rtx_code);
1929 extern enum rtx_code swap_condition (enum rtx_code);
1930 extern enum rtx_code unsigned_condition (enum rtx_code);
1931 extern enum rtx_code signed_condition (enum rtx_code);
1932 extern void mark_jump_label (rtx, rtx, int);
1933 
1934 /* In jump.c */
1935 extern rtx delete_related_insns (rtx);
1936 
1937 /* In recog.c */
1938 extern rtx *find_constant_term_loc (rtx *);
1939 
1940 /* In emit-rtl.c */
1941 extern rtx try_split (rtx, rtx, int);
1942 extern int split_branch_probability;
1943 
1944 /* In unknown file */
1945 extern rtx split_insns (rtx, rtx);
1946 
1947 /* In simplify-rtx.c */
1948 extern rtx simplify_const_unary_operation (enum rtx_code, enum machine_mode,
1949  rtx, enum machine_mode);
1950 extern rtx simplify_unary_operation (enum rtx_code, enum machine_mode, rtx,
1951  enum machine_mode);
1952 extern rtx simplify_const_binary_operation (enum rtx_code, enum machine_mode,
1953  rtx, rtx);
1954 extern rtx simplify_binary_operation (enum rtx_code, enum machine_mode, rtx,
1955  rtx);
1956 extern rtx simplify_ternary_operation (enum rtx_code, enum machine_mode,
1957  enum machine_mode, rtx, rtx, rtx);
1958 extern rtx simplify_const_relational_operation (enum rtx_code,
1959  enum machine_mode, rtx, rtx);
1960 extern rtx simplify_relational_operation (enum rtx_code, enum machine_mode,
1961  enum machine_mode, rtx, rtx);
1962 extern rtx simplify_gen_binary (enum rtx_code, enum machine_mode, rtx, rtx);
1963 extern rtx simplify_gen_unary (enum rtx_code, enum machine_mode, rtx,
1964  enum machine_mode);
1965 extern rtx simplify_gen_ternary (enum rtx_code, enum machine_mode,
1966  enum machine_mode, rtx, rtx, rtx);
1967 extern rtx simplify_gen_relational (enum rtx_code, enum machine_mode,
1968  enum machine_mode, rtx, rtx);
1969 extern rtx simplify_subreg (enum machine_mode, rtx, enum machine_mode,
1970  unsigned int);
1971 extern rtx simplify_gen_subreg (enum machine_mode, rtx, enum machine_mode,
1972  unsigned int);
1973 extern rtx simplify_replace_fn_rtx (rtx, const_rtx,
1974  rtx (*fn) (rtx, const_rtx, void *), void *);
1975 extern rtx simplify_replace_rtx (rtx, const_rtx, rtx);
1976 extern rtx simplify_rtx (const_rtx);
1977 extern rtx avoid_constant_pool_reference (rtx);
1978 extern rtx delegitimize_mem_from_attrs (rtx);
1979 extern bool mode_signbit_p (enum machine_mode, const_rtx);
1980 extern bool val_signbit_p (enum machine_mode, unsigned HOST_WIDE_INT);
1981 extern bool val_signbit_known_set_p (enum machine_mode,
1982  unsigned HOST_WIDE_INT);
1983 extern bool val_signbit_known_clear_p (enum machine_mode,
1984  unsigned HOST_WIDE_INT);
1985 
1986 /* In reginfo.c */
1987 extern enum machine_mode choose_hard_reg_mode (unsigned int, unsigned int,
1988  bool);
1989 
1990 /* In emit-rtl.c */
1991 extern rtx set_unique_reg_note (rtx, enum reg_note, rtx);
1992 extern rtx set_dst_reg_note (rtx, enum reg_note, rtx, rtx);
1993 extern void set_insn_deleted (rtx);
1994 
1995 /* Functions in rtlanal.c */
1996 
1997 /* Single set is implemented as macro for performance reasons. */
1998 #define single_set(I) (INSN_P (I) \
1999  ? (GET_CODE (PATTERN (I)) == SET \
2000  ? PATTERN (I) : single_set_1 (I)) \
2001  : NULL_RTX)
2002 #define single_set_1(I) single_set_2 (I, PATTERN (I))
2003 
2004 /* Structure used for passing data to REPLACE_LABEL. */
2005 typedef struct replace_label_data
2006 {
2007  rtx r1;
2008  rtx r2;
2009  bool update_label_nuses;
2010 } replace_label_data;
2011 
2012 extern enum machine_mode get_address_mode (rtx mem);
2013 extern int rtx_addr_can_trap_p (const_rtx);
2014 extern bool nonzero_address_p (const_rtx);
2015 extern int rtx_unstable_p (const_rtx);
2016 extern bool rtx_varies_p (const_rtx, bool);
2017 extern bool rtx_addr_varies_p (const_rtx, bool);
2018 extern rtx get_call_rtx_from (rtx);
2019 extern HOST_WIDE_INT get_integer_term (const_rtx);
2020 extern rtx get_related_value (const_rtx);
2021 extern bool offset_within_block_p (const_rtx, HOST_WIDE_INT);
2022 extern void split_const (rtx, rtx *, rtx *);
2023 extern bool unsigned_reg_p (rtx);
2024 extern int reg_mentioned_p (const_rtx, const_rtx);
2025 extern int count_occurrences (const_rtx, const_rtx, int);
2026 extern int reg_referenced_p (const_rtx, const_rtx);
2027 extern int reg_used_between_p (const_rtx, const_rtx, const_rtx);
2028 extern int reg_set_between_p (const_rtx, const_rtx, const_rtx);
2029 extern int commutative_operand_precedence (rtx);
2030 extern bool swap_commutative_operands_p (rtx, rtx);
2031 extern int modified_between_p (const_rtx, const_rtx, const_rtx);
2032 extern int no_labels_between_p (const_rtx, const_rtx);
2033 extern int modified_in_p (const_rtx, const_rtx);
2034 extern int reg_set_p (const_rtx, const_rtx);
2035 extern rtx single_set_2 (const_rtx, const_rtx);
2036 extern int multiple_sets (const_rtx);
2037 extern int set_noop_p (const_rtx);
2038 extern int noop_move_p (const_rtx);
2039 extern rtx find_last_value (rtx, rtx *, rtx, int);
2040 extern int refers_to_regno_p (unsigned int, unsigned int, const_rtx, rtx *);
2041 extern int reg_overlap_mentioned_p (const_rtx, const_rtx);
2042 extern const_rtx set_of (const_rtx, const_rtx);
2043 extern void record_hard_reg_sets (rtx, const_rtx, void *);
2044 extern void record_hard_reg_uses (rtx *, void *);
2045 #ifdef HARD_CONST
2046 extern void find_all_hard_reg_sets (const_rtx, HARD_REG_SET *);
2047 #endif
2048 extern void note_stores (const_rtx, void (*) (rtx, const_rtx, void *), void *);
2049 extern void note_uses (rtx *, void (*) (rtx *, void *), void *);
2050 extern int dead_or_set_p (const_rtx, const_rtx);
2051 extern int dead_or_set_regno_p (const_rtx, unsigned int);
2052 extern rtx find_reg_note (const_rtx, enum reg_note, const_rtx);
2053 extern rtx find_regno_note (const_rtx, enum reg_note, unsigned int);
2054 extern rtx find_reg_equal_equiv_note (const_rtx);
2055 extern rtx find_constant_src (const_rtx);
2056 extern int find_reg_fusage (const_rtx, enum rtx_code, const_rtx);
2057 extern int find_regno_fusage (const_rtx, enum rtx_code, unsigned int);
2058 extern rtx alloc_reg_note (enum reg_note, rtx, rtx);
2059 extern void add_reg_note (rtx, enum reg_note, rtx);
2060 extern void add_int_reg_note (rtx, enum reg_note, int);
2061 extern void add_shallow_copy_of_reg_note (rtx, rtx);
2062 extern void remove_note (rtx, const_rtx);
2063 extern void remove_reg_equal_equiv_notes (rtx);
2064 extern void remove_reg_equal_equiv_notes_for_regno (unsigned int);
2065 extern int side_effects_p (const_rtx);
2066 extern int volatile_refs_p (const_rtx);
2067 extern int volatile_insn_p (const_rtx);
2068 extern int may_trap_p_1 (const_rtx, unsigned);
2069 extern int may_trap_p (const_rtx);
2070 extern int may_trap_or_fault_p (const_rtx);
2071 extern bool can_throw_internal (const_rtx);
2072 extern bool can_throw_external (const_rtx);
2073 extern bool insn_could_throw_p (const_rtx);
2074 extern bool insn_nothrow_p (const_rtx);
2075 extern bool can_nonlocal_goto (const_rtx);
2076 extern void copy_reg_eh_region_note_forward (rtx, rtx, rtx);
2077 extern void copy_reg_eh_region_note_backward (rtx, rtx, rtx);
2078 extern int inequality_comparisons_p (const_rtx);
2079 extern rtx replace_rtx (rtx, rtx, rtx);
2080 extern int replace_label (rtx *, void *);
2081 extern int rtx_referenced_p (rtx, rtx);
2082 extern bool tablejump_p (const_rtx, rtx *, rtx *);
2083 extern int computed_jump_p (const_rtx);
2084 
2085 typedef int (*rtx_function) (rtx *, void *);
2086 extern int for_each_rtx (rtx *, rtx_function, void *);
2087 
2088 /* Callback for for_each_inc_dec, to process the autoinc operation OP
2089  within MEM that sets DEST to SRC + SRCOFF, or SRC if SRCOFF is
2090  NULL. The callback is passed the same opaque ARG passed to
2091  for_each_inc_dec. Return zero to continue looking for other
2092  autoinc operations, -1 to skip OP's operands, and any other value
2093  to interrupt the traversal and return that value to the caller of
2094  for_each_inc_dec. */
2095 typedef int (*for_each_inc_dec_fn) (rtx mem, rtx op, rtx dest, rtx src,
2096  rtx srcoff, void *arg);
2097 extern int for_each_inc_dec (rtx *, for_each_inc_dec_fn, void *arg);
2098 
2099 typedef int (*rtx_equal_p_callback_function) (const_rtx *, const_rtx *,
2100  rtx *, rtx *);
2101 extern int rtx_equal_p_cb (const_rtx, const_rtx,
2102  rtx_equal_p_callback_function);
2103 
2104 typedef int (*hash_rtx_callback_function) (const_rtx, enum machine_mode, rtx *,
2105  enum machine_mode *);
2106 extern unsigned hash_rtx_cb (const_rtx, enum machine_mode, int *, int *,
2107  bool, hash_rtx_callback_function);
2108 
2109 extern rtx regno_use_in (unsigned int, rtx);
2110 extern int auto_inc_p (const_rtx);
2111 extern int in_expr_list_p (const_rtx, const_rtx);
2112 extern void remove_node_from_expr_list (const_rtx, rtx *);
2113 extern int loc_mentioned_in_p (rtx *, const_rtx);
2114 extern rtx find_first_parameter_load (rtx, rtx);
2115 extern bool keep_with_call_p (const_rtx);
2116 extern bool label_is_jump_target_p (const_rtx, const_rtx);
2117 extern int insn_rtx_cost (rtx, bool);
2118 
2119 /* Given an insn and condition, return a canonical description of
2120  the test being made. */
2121 extern rtx canonicalize_condition (rtx, rtx, int, rtx *, rtx, int, int);
2122 
2123 /* Given a JUMP_INSN, return a canonical description of the test
2124  being made. */
2125 extern rtx get_condition (rtx, rtx *, int, int);
2126 
2127 /* Information about a subreg of a hard register. */
2128 struct subreg_info
2129 {
2130  /* Offset of first hard register involved in the subreg. */
2131  int offset;
2132  /* Number of hard registers involved in the subreg. */
2133  int nregs;
2134  /* Whether this subreg can be represented as a hard reg with the new
2135  mode. */
2136  bool representable_p;
2137 };
2138 
2139 extern void subreg_get_info (unsigned int, enum machine_mode,
2140  unsigned int, enum machine_mode,
2141  struct subreg_info *);
2142 
2143 /* lists.c */
2144 
2145 extern void free_EXPR_LIST_list (rtx *);
2146 extern void free_INSN_LIST_list (rtx *);
2147 extern void free_EXPR_LIST_node (rtx);
2148 extern void free_INSN_LIST_node (rtx);
2149 extern rtx alloc_INSN_LIST (rtx, rtx);
2150 extern rtx copy_INSN_LIST (rtx);
2151 extern rtx concat_INSN_LIST (rtx, rtx);
2152 extern rtx alloc_EXPR_LIST (int, rtx, rtx);
2153 extern void remove_free_INSN_LIST_elem (rtx, rtx *);
2154 extern rtx remove_list_elem (rtx, rtx *);
2155 extern rtx remove_free_INSN_LIST_node (rtx *);
2156 extern rtx remove_free_EXPR_LIST_node (rtx *);
2157 
2158 
2159 /* reginfo.c */
2160 
2161 /* Resize reg info. */
2162 extern bool resize_reg_info (void);
2163 /* Free up register info memory. */
2164 extern void free_reg_info (void);
2165 extern void init_subregs_of_mode (void);
2166 extern void finish_subregs_of_mode (void);
2167 
2168 /* recog.c */
2169 extern rtx extract_asm_operands (rtx);
2170 extern int asm_noperands (const_rtx);
2171 extern const char *decode_asm_operands (rtx, rtx *, rtx **, const char **,
2172  enum machine_mode *, location_t *);
2173 
2174 extern enum reg_class reg_preferred_class (int);
2175 extern enum reg_class reg_alternate_class (int);
2176 extern enum reg_class reg_allocno_class (int);
2177 extern void setup_reg_classes (int, enum reg_class, enum reg_class,
2178  enum reg_class);
2179 
2180 extern void split_all_insns (void);
2181 extern unsigned int split_all_insns_noflow (void);
2182 
2183 #define MAX_SAVED_CONST_INT 64
2184 extern GTY(()) rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
2185 
2186 #define const0_rtx (const_int_rtx[MAX_SAVED_CONST_INT])
2187 #define const1_rtx (const_int_rtx[MAX_SAVED_CONST_INT+1])
2188 #define const2_rtx (const_int_rtx[MAX_SAVED_CONST_INT+2])
2189 #define constm1_rtx (const_int_rtx[MAX_SAVED_CONST_INT-1])
2190 extern GTY(()) rtx const_true_rtx;
2191 
2192 extern GTY(()) rtx const_tiny_rtx[4][(int) MAX_MACHINE_MODE];
2193 
2194 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
2195  same as VOIDmode. */
2196 
2197 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
2198 
2199 /* Likewise, for the constants 1 and 2 and -1. */
2200 
2201 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
2202 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
2203 #define CONSTM1_RTX(MODE) (const_tiny_rtx[3][(int) (MODE)])
2204 
2205 extern GTY(()) rtx pc_rtx;
2206 extern GTY(()) rtx cc0_rtx;
2207 extern GTY(()) rtx ret_rtx;
2208 extern GTY(()) rtx simple_return_rtx;
2209 
2210 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
2211  is used to represent the frame pointer. This is because the
2212  hard frame pointer and the automatic variables are separated by an amount
2213  that cannot be determined until after register allocation. We can assume
2214  that in this case ELIMINABLE_REGS will be defined, one action of which
2215  will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
2216 #ifndef HARD_FRAME_POINTER_REGNUM
2217 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
2218 #endif
2219 
2220 #ifndef HARD_FRAME_POINTER_IS_FRAME_POINTER
2221 #define HARD_FRAME_POINTER_IS_FRAME_POINTER \
2222  (HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM)
2223 #endif
2224 
2225 #ifndef HARD_FRAME_POINTER_IS_ARG_POINTER
2226 #define HARD_FRAME_POINTER_IS_ARG_POINTER \
2227  (HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM)
2228 #endif
2229 
2230 /* Index labels for global_rtl. */
2231 enum global_rtl_index
2232 {
2233  GR_STACK_POINTER,
2234  GR_FRAME_POINTER,
2235 /* For register elimination to work properly these hard_frame_pointer_rtx,
2236  frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
2237  the same register. */
2238 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
2239  GR_ARG_POINTER = GR_FRAME_POINTER,
2240 #endif
2241 #if HARD_FRAME_POINTER_IS_FRAME_POINTER
2242  GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
2243 #else
2244  GR_HARD_FRAME_POINTER,
2245 #endif
2246 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
2247 #if HARD_FRAME_POINTER_IS_ARG_POINTER
2248  GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
2249 #else
2250  GR_ARG_POINTER,
2251 #endif
2252 #endif
2253  GR_VIRTUAL_INCOMING_ARGS,
2254  GR_VIRTUAL_STACK_ARGS,
2255  GR_VIRTUAL_STACK_DYNAMIC,
2256  GR_VIRTUAL_OUTGOING_ARGS,
2257  GR_VIRTUAL_CFA,
2258  GR_VIRTUAL_PREFERRED_STACK_BOUNDARY,
2259 
2260  GR_MAX
2261 };
2262 
2263 /* Target-dependent globals. */
2264 struct GTY(()) target_rtl {
2265  /* All references to the hard registers in global_rtl_index go through
2266  these unique rtl objects. On machines where the frame-pointer and
2267  arg-pointer are the same register, they use the same unique object.
2268 
2269  After register allocation, other rtl objects which used to be pseudo-regs
2270  may be clobbered to refer to the frame-pointer register.
2271  But references that were originally to the frame-pointer can be
2272  distinguished from the others because they contain frame_pointer_rtx.
2273 
2274  When to use frame_pointer_rtx and hard_frame_pointer_rtx is a little
2275  tricky: until register elimination has taken place hard_frame_pointer_rtx
2276  should be used if it is being set, and frame_pointer_rtx otherwise. After
2277  register elimination hard_frame_pointer_rtx should always be used.
2278  On machines where the two registers are same (most) then these are the
2279  same. */
2280  rtx x_global_rtl[GR_MAX];
2281 
2282  /* A unique representation of (REG:Pmode PIC_OFFSET_TABLE_REGNUM). */
2283  rtx x_pic_offset_table_rtx;
2284 
2285  /* A unique representation of (REG:Pmode RETURN_ADDRESS_POINTER_REGNUM).
2286  This is used to implement __builtin_return_address for some machines;
2287  see for instance the MIPS port. */
2288  rtx x_return_address_pointer_rtx;
2289 
2290  /* Commonly used RTL for hard registers. These objects are not
2291  necessarily unique, so we allocate them separately from global_rtl.
2292  They are initialized once per compilation unit, then copied into
2293  regno_reg_rtx at the beginning of each function. */
2294  rtx x_initial_regno_reg_rtx[FIRST_PSEUDO_REGISTER];
2295 
2296  /* A sample (mem:M stack_pointer_rtx) rtx for each mode M. */
2297  rtx x_top_of_stack[MAX_MACHINE_MODE];
2298 
2299  /* Static hunks of RTL used by the aliasing code; these are treated
2300  as persistent to avoid unnecessary RTL allocations. */
2301  rtx x_static_reg_base_value[FIRST_PSEUDO_REGISTER];
2302 
2303  /* The default memory attributes for each mode. */
2304  struct mem_attrs *x_mode_mem_attrs[(int) MAX_MACHINE_MODE];
2305 };
2306 
2307 extern GTY(()) struct target_rtl default_target_rtl;
2308 #if SWITCHABLE_TARGET
2309 extern struct target_rtl *this_target_rtl;
2310 #else
2311 #define this_target_rtl (&default_target_rtl)
2312 #endif
2313 
2314 #define global_rtl \
2315  (this_target_rtl->x_global_rtl)
2316 #define pic_offset_table_rtx \
2317  (this_target_rtl->x_pic_offset_table_rtx)
2318 #define return_address_pointer_rtx \
2319  (this_target_rtl->x_return_address_pointer_rtx)
2320 #define top_of_stack \
2321  (this_target_rtl->x_top_of_stack)
2322 #define mode_mem_attrs \
2323  (this_target_rtl->x_mode_mem_attrs)
2324 
2325 /* All references to certain hard regs, except those created
2326  by allocating pseudo regs into them (when that's possible),
2327  go through these unique rtx objects. */
2328 #define stack_pointer_rtx (global_rtl[GR_STACK_POINTER])
2329 #define frame_pointer_rtx (global_rtl[GR_FRAME_POINTER])
2330 #define hard_frame_pointer_rtx (global_rtl[GR_HARD_FRAME_POINTER])
2331 #define arg_pointer_rtx (global_rtl[GR_ARG_POINTER])
2332 
2333 #ifndef GENERATOR_FILE
2334 /* Return the attributes of a MEM rtx. */
2335 static inline struct mem_attrs *
2336 get_mem_attrs (const_rtx x)
2337 {
2338  struct mem_attrs *attrs;
2339 
2340  attrs = MEM_ATTRS (x);
2341  if (!attrs)
2342  attrs = mode_mem_attrs[(int) GET_MODE (x)];
2343  return attrs;
2344 }
2345 #endif
2346 
2347 /* Include the RTL generation functions. */
2348 
2349 #ifndef GENERATOR_FILE
2350 #include "genrtl.h"
2351 #undef gen_rtx_ASM_INPUT
2352 #define gen_rtx_ASM_INPUT(MODE, ARG0) \
2353  gen_rtx_fmt_si (ASM_INPUT, (MODE), (ARG0), 0)
2354 #define gen_rtx_ASM_INPUT_loc(MODE, ARG0, LOC) \
2355  gen_rtx_fmt_si (ASM_INPUT, (MODE), (ARG0), (LOC))
2356 #endif
2357 
2358 /* There are some RTL codes that require special attention; the
2359  generation functions included above do the raw handling. If you
2360  add to this list, modify special_rtx in gengenrtl.c as well. */
2361 
2362 extern rtx gen_rtx_CONST_INT (enum machine_mode, HOST_WIDE_INT);
2363 extern rtx gen_rtx_CONST_VECTOR (enum machine_mode, rtvec);
2364 extern rtx gen_raw_REG (enum machine_mode, int);
2365 extern rtx gen_rtx_REG (enum machine_mode, unsigned);
2366 extern rtx gen_rtx_SUBREG (enum machine_mode, rtx, int);
2367 extern rtx gen_rtx_MEM (enum machine_mode, rtx);
2368 
2369 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (N))
2370 
2371 /* Virtual registers are used during RTL generation to refer to locations into
2372  the stack frame when the actual location isn't known until RTL generation
2373  is complete. The routine instantiate_virtual_regs replaces these with
2374  the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
2375  a constant. */
2376 
2377 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
2378 
2379 /* This points to the first word of the incoming arguments passed on the stack,
2380  either by the caller or by the callee when pretending it was passed by the
2381  caller. */
2382 
2383 #define virtual_incoming_args_rtx (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
2384 
2385 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
2386 
2387 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
2388  variable on the stack. Otherwise, it points to the first variable on
2389  the stack. */
2390 
2391 #define virtual_stack_vars_rtx (global_rtl[GR_VIRTUAL_STACK_ARGS])
2392 
2393 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
2394 
2395 /* This points to the location of dynamically-allocated memory on the stack
2396  immediately after the stack pointer has been adjusted by the amount
2397  desired. */
2398 
2399 #define virtual_stack_dynamic_rtx (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
2400 
2401 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
2402 
2403 /* This points to the location in the stack at which outgoing arguments should
2404  be written when the stack is pre-pushed (arguments pushed using push
2405  insns always use sp). */
2406 
2407 #define virtual_outgoing_args_rtx (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
2408 
2409 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
2410 
2411 /* This points to the Canonical Frame Address of the function. This
2412  should correspond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
2413  but is calculated relative to the arg pointer for simplicity; the
2414  frame pointer nor stack pointer are necessarily fixed relative to
2415  the CFA until after reload. */
2416 
2417 #define virtual_cfa_rtx (global_rtl[GR_VIRTUAL_CFA])
2418 
2419 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
2420 
2421 #define LAST_VIRTUAL_POINTER_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
2422 
2423 /* This is replaced by crtl->preferred_stack_boundary / BITS_PER_UNIT
2424  when finalized. */
2425 
2426 #define virtual_preferred_stack_boundary_rtx \
2427  (global_rtl[GR_VIRTUAL_PREFERRED_STACK_BOUNDARY])
2428 
2429 #define VIRTUAL_PREFERRED_STACK_BOUNDARY_REGNUM \
2430  ((FIRST_VIRTUAL_REGISTER) + 5)
2431 
2432 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 5)
2433 
2434 /* Nonzero if REGNUM is a pointer into the stack frame. */
2435 #define REGNO_PTR_FRAME_P(REGNUM) \
2436  ((REGNUM) == STACK_POINTER_REGNUM \
2437  || (REGNUM) == FRAME_POINTER_REGNUM \
2438  || (REGNUM) == HARD_FRAME_POINTER_REGNUM \
2439  || (REGNUM) == ARG_POINTER_REGNUM \
2440  || ((REGNUM) >= FIRST_VIRTUAL_REGISTER \
2441  && (REGNUM) <= LAST_VIRTUAL_POINTER_REGISTER))
2442 
2443 /* REGNUM never really appearing in the INSN stream. */
2444 #define INVALID_REGNUM (~(unsigned int) 0)
2445 
2446 /* REGNUM for which no debug information can be generated. */
2447 #define IGNORED_DWARF_REGNUM (INVALID_REGNUM - 1)
2448 
2449 extern rtx output_constant_def (tree, int);
2450 extern rtx lookup_constant_def (tree);
2451 
2452 /* Nonzero after end of reload pass.
2453  Set to 1 or 0 by reload1.c. */
2454 
2455 extern int reload_completed;
2456 
2457 /* Nonzero after thread_prologue_and_epilogue_insns has run. */
2458 extern int epilogue_completed;
2459 
2460 /* Set to 1 while reload_as_needed is operating.
2461  Required by some machines to handle any generated moves differently. */
2462 
2463 extern int reload_in_progress;
2464 
2465 /* Set to 1 while in lra. */
2466 extern int lra_in_progress;
2467 
2468 /* This macro indicates whether you may create a new
2469  pseudo-register. */
2470 
2471 #define can_create_pseudo_p() (!reload_in_progress && !reload_completed)
2472 
2473 #ifdef STACK_REGS
2474 /* Nonzero after end of regstack pass.
2475  Set to 1 or 0 by reg-stack.c. */
2476 extern int regstack_completed;
2477 #endif
2478 
2479 /* If this is nonzero, we do not bother generating VOLATILE
2480  around volatile memory references, and we are willing to
2481  output indirect addresses. If cse is to follow, we reject
2482  indirect addresses so a useful potential cse is generated;
2483  if it is used only once, instruction combination will produce
2484  the same indirect address eventually. */
2485 extern int cse_not_expected;
2486 
2487 /* Translates rtx code to tree code, for those codes needed by
2488  REAL_ARITHMETIC. The function returns an int because the caller may not
2489  know what `enum tree_code' means. */
2490 
2491 extern int rtx_to_tree_code (enum rtx_code);
2492 
2493 /* In cse.c */
2494 extern int delete_trivially_dead_insns (rtx, int);
2495 extern int exp_equiv_p (const_rtx, const_rtx, int, bool);
2496 extern unsigned hash_rtx (const_rtx x, enum machine_mode, int *, int *, bool);
2497 
2498 /* In dse.c */
2499 extern bool check_for_inc_dec (rtx insn);
2500 
2501 /* In jump.c */
2502 extern int comparison_dominates_p (enum rtx_code, enum rtx_code);
2503 extern bool jump_to_label_p (rtx);
2504 extern int condjump_p (const_rtx);
2505 extern int any_condjump_p (const_rtx);
2506 extern int any_uncondjump_p (const_rtx);
2507 extern rtx pc_set (const_rtx);
2508 extern rtx condjump_label (const_rtx);
2509 extern int simplejump_p (const_rtx);
2510 extern int returnjump_p (rtx);
2511 extern int eh_returnjump_p (rtx);
2512 extern int onlyjump_p (const_rtx);
2513 extern int only_sets_cc0_p (const_rtx);
2514 extern int sets_cc0_p (const_rtx);
2515 extern int invert_jump_1 (rtx, rtx);
2516 extern int invert_jump (rtx, rtx, int);
2517 extern int rtx_renumbered_equal_p (const_rtx, const_rtx);
2518 extern int true_regnum (const_rtx);
2519 extern unsigned int reg_or_subregno (const_rtx);
2520 extern int redirect_jump_1 (rtx, rtx);
2521 extern void redirect_jump_2 (rtx, rtx, rtx, int, int);
2522 extern int redirect_jump (rtx, rtx, int);
2523 extern void rebuild_jump_labels (rtx);
2524 extern void rebuild_jump_labels_chain (rtx);
2525 extern rtx reversed_comparison (const_rtx, enum machine_mode);
2526 extern enum rtx_code reversed_comparison_code (const_rtx, const_rtx);
2527 extern enum rtx_code reversed_comparison_code_parts (enum rtx_code, const_rtx,
2528  const_rtx, const_rtx);
2529 extern void delete_for_peephole (rtx, rtx);
2530 extern int condjump_in_parallel_p (const_rtx);
2531 
2532 /* In emit-rtl.c. */
2533 extern int max_reg_num (void);
2534 extern int max_label_num (void);
2535 extern int get_first_label_num (void);
2536 extern void maybe_set_first_label_num (rtx);
2537 extern void delete_insns_since (rtx);
2538 extern void mark_reg_pointer (rtx, int);
2539 extern void mark_user_reg (rtx);
2540 extern void reset_used_flags (rtx);
2541 extern void set_used_flags (rtx);
2542 extern void reorder_insns (rtx, rtx, rtx);
2543 extern void reorder_insns_nobb (rtx, rtx, rtx);
2544 extern int get_max_insn_count (void);
2545 extern int in_sequence_p (void);
2546 extern void init_emit (void);
2547 extern void init_emit_regs (void);
2548 extern void init_emit_once (void);
2549 extern void push_topmost_sequence (void);
2550 extern void pop_topmost_sequence (void);
2551 extern void set_new_first_and_last_insn (rtx, rtx);
2552 extern unsigned int unshare_all_rtl (void);
2553 extern void unshare_all_rtl_again (rtx);
2554 extern void unshare_all_rtl_in_chain (rtx);
2555 extern void verify_rtl_sharing (void);
2556 extern void add_insn (rtx);
2557 extern void add_insn_before (rtx, rtx, basic_block);
2558 extern void add_insn_after (rtx, rtx, basic_block);
2559 extern void remove_insn (rtx);
2560 extern rtx emit (rtx);
2561 extern void delete_insn (rtx);
2562 extern rtx entry_of_function (void);
2563 extern void emit_insn_at_entry (rtx);
2564 extern void delete_insn_chain (rtx, rtx, bool);
2565 extern rtx unlink_insn_chain (rtx, rtx);
2566 extern void delete_insn_and_edges (rtx);
2567 extern rtx gen_lowpart_SUBREG (enum machine_mode, rtx);
2568 extern rtx gen_const_mem (enum machine_mode, rtx);
2569 extern rtx gen_frame_mem (enum machine_mode, rtx);
2570 extern rtx gen_tmp_stack_mem (enum machine_mode, rtx);
2571 extern bool validate_subreg (enum machine_mode, enum machine_mode,
2572  const_rtx, unsigned int);
2573 
2574 /* In combine.c */
2575 extern unsigned int extended_count (const_rtx, enum machine_mode, int);
2576 extern rtx remove_death (unsigned int, rtx);
2577 extern void dump_combine_stats (FILE *);
2578 extern void dump_combine_total_stats (FILE *);
2579 extern rtx make_compound_operation (rtx, enum rtx_code);
2580 
2581 /* In cfgcleanup.c */
2582 extern void delete_dead_jumptables (void);
2583 
2584 /* In sched-rgn.c. */
2585 extern void schedule_insns (void);
2586 
2587 /* In sched-ebb.c. */
2588 extern void schedule_ebbs (void);
2589 
2590 /* In sel-sched-dump.c. */
2591 extern void sel_sched_fix_param (const char *param, const char *val);
2592 
2593 /* In print-rtl.c */
2594 extern const char *print_rtx_head;
2595 extern void debug (const rtx_def &ref);
2596 extern void debug (const rtx_def *ptr);
2597 extern void debug_rtx (const_rtx);
2598 extern void debug_rtx_list (const_rtx, int);
2599 extern void debug_rtx_range (const_rtx, const_rtx);
2600 extern const_rtx debug_rtx_find (const_rtx, int);
2601 extern void print_mem_expr (FILE *, const_tree);
2602 extern void print_rtl (FILE *, const_rtx);
2603 extern void print_simple_rtl (FILE *, const_rtx);
2604 extern int print_rtl_single (FILE *, const_rtx);
2605 extern int print_rtl_single_with_indent (FILE *, const_rtx, int);
2606 extern void print_inline_rtx (FILE *, const_rtx, int);
2607 
2608 /* Functions in sched-vis.c. FIXME: Ideally these functions would
2609  not be in sched-vis.c but in rtl.c, because they are not only used
2610  by the scheduler anymore but for all "slim" RTL dumping. */
2611 extern void dump_value_slim (FILE *, const_rtx, int);
2612 extern void dump_insn_slim (FILE *, const_rtx);
2613 extern void dump_rtl_slim (FILE *, const_rtx, const_rtx, int, int);
2614 extern void print_value (pretty_printer *, const_rtx, int);
2615 extern void print_pattern (pretty_printer *, const_rtx, int);
2616 extern void print_insn (pretty_printer *, const_rtx, int);
2617 extern void rtl_dump_bb_for_graph (pretty_printer *, basic_block);
2618 extern const char *str_pattern_slim (const_rtx);
2619 
2620 /* In function.c */
2621 extern void reposition_prologue_and_epilogue_notes (void);
2622 extern int prologue_epilogue_contains (const_rtx);
2623 extern int sibcall_epilogue_contains (const_rtx);
2624 extern void update_temp_slot_address (rtx, rtx);
2625 extern void maybe_copy_prologue_epilogue_insn (rtx, rtx);
2626 extern void set_return_jump_label (rtx);
2627 
2628 /* In stmt.c */
2629 extern void expand_null_return (void);
2630 extern void expand_naked_return (void);
2631 extern void emit_jump (rtx);
2632 
2633 /* In expr.c */
2634 extern rtx move_by_pieces (rtx, rtx, unsigned HOST_WIDE_INT,
2635  unsigned int, int);
2636 extern HOST_WIDE_INT find_args_size_adjust (rtx);
2637 extern int fixup_args_size_notes (rtx, rtx, int);
2638 
2639 /* In cfgrtl.c */
2640 extern void print_rtl_with_bb (FILE *, const_rtx, int);
2641 extern rtx duplicate_insn_chain (rtx, rtx);
2642 
2643 /* In expmed.c */
2644 extern void init_expmed (void);
2645 extern void expand_inc (rtx, rtx);
2646 extern void expand_dec (rtx, rtx);
2647 
2648 /* In lower-subreg.c */
2649 extern void init_lower_subreg (void);
2650 
2651 /* In gcse.c */
2652 extern bool can_copy_p (enum machine_mode);
2653 extern bool can_assign_to_reg_without_clobbers_p (rtx);
2654 extern rtx fis_get_condition (rtx);
2655 
2656 /* In ira.c */
2657 #ifdef HARD_CONST
2658 extern HARD_REG_SET eliminable_regset;
2659 #endif
2660 extern void mark_elimination (int, int);
2661 
2662 /* In reginfo.c */
2663 extern int reg_classes_intersect_p (reg_class_t, reg_class_t);
2664 extern int reg_class_subset_p (reg_class_t, reg_class_t);
2665 extern void globalize_reg (tree, int);
2666 extern void init_reg_modes_target (void);
2667 extern void init_regs (void);
2668 extern void reinit_regs (void);
2669 extern void init_fake_stack_mems (void);
2670 extern void save_register_info (void);
2671 extern void init_reg_sets (void);
2672 extern void regclass (rtx, int);
2673 extern void reg_scan (rtx, unsigned int);
2674 extern void fix_register (const char *, int, int);
2675 extern bool invalid_mode_change_p (unsigned int, enum reg_class);
2676 
2677 /* In reload1.c */
2678 extern int function_invariant_p (const_rtx);
2679 
2680 /* In calls.c */
2681 enum libcall_type
2682 {
2683  LCT_NORMAL = 0,
2684  LCT_CONST = 1,
2685  LCT_PURE = 2,
2686  LCT_NORETURN = 3,
2687  LCT_THROW = 4,
2688  LCT_RETURNS_TWICE = 5
2689 };
2690 
2691 extern void emit_library_call (rtx, enum libcall_type, enum machine_mode, int,
2692  ...);
2693 extern rtx emit_library_call_value (rtx, rtx, enum libcall_type,
2694  enum machine_mode, int, ...);
2695 
2696 /* In varasm.c */
2697 extern void init_varasm_once (void);
2698 
2699 extern rtx make_debug_expr_from_rtl (const_rtx);
2700 
2701 /* In read-rtl.c */
2702 extern bool read_rtx (const char *, rtx *);
2703 
2704 /* In alias.c */
2705 extern rtx canon_rtx (rtx);
2706 extern int true_dependence (const_rtx, enum machine_mode, const_rtx);
2707 extern rtx get_addr (rtx);
2708 extern int canon_true_dependence (const_rtx, enum machine_mode, rtx,
2709  const_rtx, rtx);
2710 extern int read_dependence (const_rtx, const_rtx);
2711 extern int anti_dependence (const_rtx, const_rtx);
2712 extern int canon_anti_dependence (const_rtx, bool,
2713  const_rtx, enum machine_mode, rtx);
2714 extern int output_dependence (const_rtx, const_rtx);
2715 extern int may_alias_p (const_rtx, const_rtx);
2716 extern void init_alias_target (void);
2717 extern void init_alias_analysis (void);
2718 extern void end_alias_analysis (void);
2719 extern void vt_equate_reg_base_value (const_rtx, const_rtx);
2720 extern bool memory_modified_in_insn_p (const_rtx, const_rtx);
2721 extern bool memory_must_be_modified_in_insn_p (const_rtx, const_rtx);
2722 extern bool may_be_sp_based_p (rtx);
2723 extern rtx gen_hard_reg_clobber (enum machine_mode, unsigned int);
2724 extern rtx get_reg_known_value (unsigned int);
2725 extern bool get_reg_known_equiv_p (unsigned int);
2726 extern rtx get_reg_base_value (unsigned int);
2727 
2728 #ifdef STACK_REGS
2729 extern int stack_regs_mentioned (const_rtx insn);
2730 #endif
2731 
2732 /* In toplev.c */
2733 extern GTY(()) rtx stack_limit_rtx;
2734 
2735 /* In predict.c */
2736 extern void invert_br_probabilities (rtx);
2737 extern bool expensive_function_p (int);
2738 
2739 /* In var-tracking.c */
2740 extern unsigned int variable_tracking_main (void);
2741 
2742 /* In stor-layout.c. */
2743 extern void get_mode_bounds (enum machine_mode, int, enum machine_mode,
2744  rtx *, rtx *);
2745 
2746 /* In loop-unswitch.c */
2747 extern rtx reversed_condition (rtx);
2748 extern rtx compare_and_jump_seq (rtx, rtx, enum rtx_code, rtx, int, rtx);
2749 
2750 /* In loop-iv.c */
2751 extern rtx canon_condition (rtx);
2752 extern void simplify_using_condition (rtx, rtx *, bitmap);
2753 
2754 /* In final.c */
2755 extern unsigned int compute_alignments (void);
2756 extern void update_alignments (vec<rtx> &);
2757 extern int asm_str_count (const char *templ);
2758 
2759 struct rtl_hooks
2760 {
2761  rtx (*gen_lowpart) (enum machine_mode, rtx);
2762  rtx (*gen_lowpart_no_emit) (enum machine_mode, rtx);
2763  rtx (*reg_nonzero_bits) (const_rtx, enum machine_mode, const_rtx, enum machine_mode,
2764  unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT *);
2765  rtx (*reg_num_sign_bit_copies) (const_rtx, enum machine_mode, const_rtx, enum machine_mode,
2766  unsigned int, unsigned int *);
2767  bool (*reg_truncated_to_mode) (enum machine_mode, const_rtx);
2768 
2769  /* Whenever you add entries here, make sure you adjust rtlhooks-def.h. */
2770 };
2771 
2772 /* Each pass can provide its own. */
2773 extern struct rtl_hooks rtl_hooks;
2774 
2775 /* ... but then it has to restore these. */
2776 extern const struct rtl_hooks general_rtl_hooks;
2777 
2778 /* Keep this for the nonce. */
2779 #define gen_lowpart rtl_hooks.gen_lowpart
2780 
2781 extern void insn_locations_init (void);
2782 extern void insn_locations_finalize (void);
2783 extern void set_curr_insn_location (location_t);
2784 extern location_t curr_insn_location (void);
2785 extern bool optimize_insn_for_size_p (void);
2786 extern bool optimize_insn_for_speed_p (void);
2787 
2788 /* rtl-error.c */
2789 extern void _fatal_insn_not_found (const_rtx, const char *, int, const char *)
2790  ATTRIBUTE_NORETURN;
2791 extern void _fatal_insn (const char *, const_rtx, const char *, int, const char *)
2792  ATTRIBUTE_NORETURN;
2793 
2794 #define fatal_insn(msgid, insn) \
2795  _fatal_insn (msgid, insn, __FILE__, __LINE__, __FUNCTION__)
2796 #define fatal_insn_not_found(insn) \
2797  _fatal_insn_not_found (insn, __FILE__, __LINE__, __FUNCTION__)
2798 
2799 
2800 
2801 #endif /* ! GCC_RTL_H */