1 /* Register Transfer Language (RTL) definitions for GNU C-Compiler
2 Copyright (C) 1987, 1991, 1992, 1993 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
23 #undef FFS /* Some systems predefine this symbol; don't let it interfere. */
24 #undef FLOAT /* Likewise. */
25 #undef ABS /* Likewise. */
26 #undef PC /* Likewise. */
28 /* Register Transfer Language EXPRESSIONS CODES */
30 #define RTX_CODE enum rtx_code
33 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
34 #include "rtl.def" /* rtl expressions are documented here */
37 LAST_AND_UNUSED_RTX_CODE
}; /* A convenient way to get a value for
39 Assumes default enum value assignment. */
41 #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
42 /* The cast here, saves many elsewhere. */
44 extern int rtx_length
[];
45 #define GET_RTX_LENGTH(CODE) (rtx_length[(int)(CODE)])
47 extern char *rtx_name
[];
48 #define GET_RTX_NAME(CODE) (rtx_name[(int)(CODE)])
50 extern char *rtx_format
[];
51 #define GET_RTX_FORMAT(CODE) (rtx_format[(int)(CODE)])
53 extern char rtx_class
[];
54 #define GET_RTX_CLASS(CODE) (rtx_class[(int)(CODE)])
56 /* Common union for an element of an rtx. */
58 typedef union rtunion_def
64 struct rtvec_def
*rtvec
;
65 enum machine_mode rttype
;
68 /* RTL expression ("rtx"). */
70 typedef struct rtx_def
72 #ifdef ONLY_INT_FIELDS
74 unsigned int code
: 16;
79 /* The kind of expression this is. */
80 enum rtx_code code
: 16;
82 /* The kind of value the expression has. */
83 #ifdef ONLY_INT_FIELDS
86 enum machine_mode mode
: 8;
88 /* 1 in an INSN if it can alter flow of control
89 within this function. Not yet used! */
90 unsigned int jump
: 1;
91 /* 1 in an INSN if it can call another function. Not yet used! */
92 unsigned int call
: 1;
93 /* 1 in a MEM or REG if value of this expression will never change
94 during the current function, even though it is not
96 1 in a SUBREG if it is from a promoted variable that is unsigned.
97 1 in a SYMBOL_REF if it addresses something in the per-function
99 1 in a CALL_INSN if it is a const call.
100 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
101 reorg until end of compilation; cleared before used. */
102 unsigned int unchanging
: 1;
103 /* 1 in a MEM expression if contents of memory are volatile.
104 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
106 1 in a REG expression if corresponds to a variable declared by the user.
107 0 for an internally generated temporary.
108 In a SYMBOL_REF, this flag is used for machine-specific purposes.
109 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
110 unsigned int volatil
: 1;
111 /* 1 in a MEM referring to a field of a structure (not a union!).
112 0 if the MEM was a variable or the result of a * operator in C;
113 1 if it was the result of a . or -> operator (on a struct) in C.
114 1 in a REG if the register is used only in exit code a loop.
115 1 in a SUBREG expression if was generated from a variable with a
117 1 in a CODE_LABEL if the label is used for nonlocal gotos
118 and must not be deleted even if its count is zero.
119 1 in a LABEL_REF if this is a reference to a label outside the
121 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
122 together with the preceding insn. Valid only within sched.
123 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
124 from the target of a branch. Valid from reorg until end of compilation;
125 cleared before used. */
126 unsigned int in_struct
: 1;
127 /* 1 if this rtx is used. This is used for copying shared structure.
128 See `unshare_all_rtl'.
129 In a REG, this is not needed for that purpose, and used instead
130 in `leaf_renumber_regs_insn'.
131 In a SYMBOL_REF, means that emit_library_call
132 has used it as the function. */
133 unsigned int used
: 1;
134 /* Nonzero if this rtx came from procedure integration.
135 In a REG, nonzero means this reg refers to the return value
136 of the current function. */
137 unsigned integrated
: 1;
138 /* The first element of the operands of this rtx.
139 The number of operands and their types are controlled
140 by the `code' field, according to rtl.def. */
145 /* Add prototype support. */
147 #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
148 #define PROTO(ARGS) ARGS
150 #define PROTO(ARGS) ()
154 #define NULL_RTX (rtx) 0
156 /* Define a generic NULL if one hasn't already been defined. */
163 #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
164 #define GENERIC_PTR void *
166 #define GENERIC_PTR char *
171 #define NULL_PTR ((GENERIC_PTR)0)
174 /* Define macros to access the `code' field of the rtx. */
176 #ifdef SHORT_ENUM_BUG
177 #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code))
178 #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE)))
180 #define GET_CODE(RTX) ((RTX)->code)
181 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
184 #define GET_MODE(RTX) ((RTX)->mode)
185 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
187 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
188 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
190 /* RTL vector. These appear inside RTX's when there is a need
191 for a variable number of things. The principle use is inside
192 PARALLEL expressions. */
194 typedef struct rtvec_def
{
195 unsigned num_elem
; /* number of elements */
199 #define NULL_RTVEC (rtvec) 0
201 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
202 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (unsigned) NUM)
204 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx)
206 /* 1 if X is a REG. */
208 #define REG_P(X) (GET_CODE (X) == REG)
210 /* 1 if X is a constant value that is an integer. */
212 #define CONSTANT_P(X) \
213 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
214 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
215 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH)
217 /* General accessor macros for accessing the fields of an rtx. */
219 #define XEXP(RTX, N) ((RTX)->fld[N].rtx)
220 #define XINT(RTX, N) ((RTX)->fld[N].rtint)
221 #define XWINT(RTX, N) ((RTX)->fld[N].rtwint)
222 #define XSTR(RTX, N) ((RTX)->fld[N].rtstr)
223 #define XVEC(RTX, N) ((RTX)->fld[N].rtvec)
224 #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
225 #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
227 /* ACCESS MACROS for particular fields of insns. */
229 /* Holds a unique number for each insn.
230 These are not necessarily sequentially increasing. */
231 #define INSN_UID(INSN) ((INSN)->fld[0].rtint)
233 /* Chain insns together in sequence. */
234 #define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
235 #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
237 /* The body of an insn. */
238 #define PATTERN(INSN) ((INSN)->fld[3].rtx)
240 /* Code number of instruction, from when it was recognized.
241 -1 means this instruction has not been recognized yet. */
242 #define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
244 /* Set up in flow.c; empty before then.
245 Holds a chain of INSN_LIST rtx's whose first operands point at
246 previous insns with direct data-flow connections to this one.
247 That means that those insns set variables whose next use is in this insn.
248 They are always in the same basic block as this insn. */
249 #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx)
251 /* 1 if insn has been deleted. */
252 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
254 /* 1 if insn is a call to a const function. */
255 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
257 /* 1 if insn is a branch that should not unconditionally execute its
258 delay slots, i.e., it is an annulled branch. */
259 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
261 /* 1 if insn is in a delay slot and is from the target of the branch. If
262 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
263 executed if the branch is taken. For annulled branches with this bit
264 clear, the insn should be executed only if the branch is not taken. */
265 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
267 /* Holds a list of notes on what this insn does to various REGs.
268 It is a chain of EXPR_LIST rtx's, where the second operand
269 is the chain pointer and the first operand is the REG being described.
270 The mode field of the EXPR_LIST contains not a real machine mode
271 but a value that says what this note says about the REG:
272 REG_DEAD means that the value in REG dies in this insn (i.e., it is
273 not needed past this insn). If REG is set in this insn, the REG_DEAD
274 note may, but need not, be omitted.
275 REG_INC means that the REG is autoincremented or autodecremented.
276 REG_EQUIV describes the insn as a whole; it says that the
277 insn sets a register to a constant value or to be equivalent to
278 a memory address. If the
279 register is spilled to the stack then the constant value
280 should be substituted for it. The contents of the REG_EQUIV
281 is the constant value or memory address, which may be different
282 from the source of the SET although it has the same value.
283 REG_EQUAL is like REG_EQUIV except that the destination
284 is only momentarily equal to the specified rtx. Therefore, it
285 cannot be used for substitution; but it can be used for cse.
286 REG_RETVAL means that this insn copies the return-value of
287 a library call out of the hard reg for return values. This note
288 is actually an INSN_LIST and it points to the first insn involved
289 in setting up arguments for the call. flow.c uses this to delete
290 the entire library call when its result is dead.
291 REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn
292 of the library call and points at the one that has the REG_RETVAL.
293 REG_WAS_0 says that the register set in this insn held 0 before the insn.
294 The contents of the note is the insn that stored the 0.
295 If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative.
296 The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST.
297 REG_NONNEG means that the register is always nonnegative during
298 the containing loop. This is used in branches so that decrement and
299 branch instructions terminating on zero can be matched. There must be
300 an insn pattern in the md file named `decrement_and_branch_until_zero'
301 or else this will never be added to any instructions.
302 REG_NO_CONFLICT means there is no conflict *after this insn*
303 between the register in the note and the destination of this insn.
304 REG_UNUSED identifies a register set in this insn and never used.
305 REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
306 CC0, respectively. Normally, these are required to be consecutive insns,
307 but we permit putting a cc0-setting insn in the delay slot of a branch
308 as long as only one copy of the insn exists. In that case, these notes
309 point from one to the other to allow code generation to determine what
310 any require information and to properly update CC_STATUS.
311 REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to
312 say that the CODE_LABEL contained in the REG_LABEL note is used
314 REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
315 dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output
316 (write after write) dependencies. Data dependencies, which are the only
317 type of LOG_LINK created by flow, are represented by a 0 reg note kind. */
319 #define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
321 /* Don't forget to change reg_note_name in rtl.c. */
322 enum reg_note
{ REG_DEAD
= 1, REG_INC
= 2, REG_EQUIV
= 3, REG_WAS_0
= 4,
323 REG_EQUAL
= 5, REG_RETVAL
= 6, REG_LIBCALL
= 7,
324 REG_NONNEG
= 8, REG_NO_CONFLICT
= 9, REG_UNUSED
= 10,
325 REG_CC_SETTER
= 11, REG_CC_USER
= 12, REG_LABEL
= 13,
326 REG_DEP_ANTI
= 14, REG_DEP_OUTPUT
= 15 };
328 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
329 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
330 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
332 /* Names for REG_NOTE's in EXPR_LIST insn's. */
334 extern char *reg_note_name
[];
335 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int)(MODE)])
337 /* The label-number of a code-label. The assembler label
338 is made from `L' and the label-number printed in decimal.
339 Label numbers are unique in a compilation. */
340 #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint)
342 #define LINE_NUMBER NOTE
344 /* In a NOTE that is a line number, this is a string for the file name
345 that the line is in. We use the same field to record block numbers
346 temporarily in NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.
347 (We avoid lots of casts between ints and pointers if we use a
348 different macro for the bock number.) */
350 #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr)
351 #define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint)
353 /* In a NOTE that is a line number, this is the line number.
354 Other kinds of NOTEs are identified by negative numbers here. */
355 #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)
357 /* Codes that appear in the NOTE_LINE_NUMBER field
358 for kinds of notes that are not line numbers.
360 Notice that we do not try to use zero here for any of
361 the special note codes because sometimes the source line
362 actually can be zero! This happens (for example) when we
363 are generating code for the per-translation-unit constructor
364 and destructor routines for some C++ translation unit.
366 If you should change any of the following values, or if you
367 should add a new value here, don't forget to change the
368 note_insn_name array in rtl.c. */
370 /* This note is used to get rid of an insn
371 when it isn't safe to patch the insn out of the chain. */
372 #define NOTE_INSN_DELETED -1
373 #define NOTE_INSN_BLOCK_BEG -2
374 #define NOTE_INSN_BLOCK_END -3
375 #define NOTE_INSN_LOOP_BEG -4
376 #define NOTE_INSN_LOOP_END -5
377 /* This kind of note is generated at the end of the function body,
378 just before the return insn or return label.
379 In an optimizing compilation it is deleted by the first jump optimization,
380 after enabling that optimizer to determine whether control can fall
381 off the end of the function body without a return statement. */
382 #define NOTE_INSN_FUNCTION_END -6
383 /* This kind of note is generated just after each call to `setjmp', et al. */
384 #define NOTE_INSN_SETJMP -7
385 /* Generated at the place in a loop that `continue' jumps to. */
386 #define NOTE_INSN_LOOP_CONT -8
387 /* Generated at the start of a duplicated exit test. */
388 #define NOTE_INSN_LOOP_VTOP -9
389 /* This marks the point immediately after the last prologue insn. */
390 #define NOTE_INSN_PROLOGUE_END -10
391 /* This marks the point immediately prior to the first epilogue insn. */
392 #define NOTE_INSN_EPILOGUE_BEG -11
393 /* Generated in place of user-declared labels when they are deleted. */
394 #define NOTE_INSN_DELETED_LABEL -12
395 /* This note indicates the start of the real body of the function,
396 i.e. the point just after all of the parms have been moved into
398 #define NOTE_INSN_FUNCTION_BEG -13
401 #if 0 /* These are not used, and I don't know what they were for. --rms. */
402 #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
403 #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
404 #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
405 #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
406 #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
409 /* Names for NOTE insn's other than line numbers. */
411 extern char *note_insn_name
[];
412 #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
414 /* The name of a label, in case it corresponds to an explicit label
415 in the input source code. */
416 #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
418 /* In jump.c, each label contains a count of the number
419 of LABEL_REFs that point at it, so unused labels can be deleted. */
420 #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
422 /* The rest is used instead of the above, in a CODE_LABEL,
423 if bytecode is being output.
424 We make the slightly klugy assumption that a LABEL has enough slots
425 to hold these things. That happens to be true. */
427 /* For static or external objects. */
428 #define BYTECODE_LABEL(X) (XEXP ((X), 0))
430 /* For goto labels inside bytecode functions. */
431 #define BYTECODE_BC_LABEL(X) (*(struct bc_label **) &XEXP ((X), 1))
433 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
434 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
435 be decremented and possibly the label can be deleted. */
436 #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx)
438 /* Once basic blocks are found in flow.c,
439 each CODE_LABEL starts a chain that goes through
440 all the LABEL_REFs that jump to that label.
441 The chain eventually winds up at the CODE_LABEL; it is circular. */
442 #define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx)
444 /* This is the field in the LABEL_REF through which the circular chain
445 of references to a particular label is linked.
446 This chain is set up in flow.c. */
448 #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
450 /* Once basic blocks are found in flow.c,
451 Each LABEL_REF points to its containing instruction with this field. */
453 #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
455 /* For a REG rtx, REGNO extracts the register number. */
457 #define REGNO(RTX) ((RTX)->fld[0].rtint)
459 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
460 is the current function's return value. */
462 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
464 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
465 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
467 /* For a CONST_INT rtx, INTVAL extracts the integer. */
469 #define INTVAL(RTX) ((RTX)->fld[0].rtwint)
471 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
472 SUBREG_WORD extracts the word-number. */
474 #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
475 #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
477 /* 1 if the REG contained in SUBREG_REG is already known to be
478 sign- or zero-extended from the mode of the SUBREG to the mode of
479 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
482 When used as a LHS, is means that this extension must be done
483 when assigning to SUBREG_REG. */
485 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
486 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
488 /* Access various components of an ASM_OPERANDS rtx. */
490 #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
491 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
492 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
493 #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
494 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
495 #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
496 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
497 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
498 #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
499 #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
500 #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
502 /* For a MEM rtx, 1 if it's a volatile reference.
503 Also in an ASM_OPERANDS rtx. */
504 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
506 /* For a MEM rtx, 1 if it refers to a structure or union component. */
507 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
509 /* For a LABEL_REF, 1 means that this reference is to a label outside the
510 loop containing the reference. */
511 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
513 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
514 /* Likewise in an EXPR_LIST for a REG_LABEL note. */
515 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
517 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
518 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
520 /* For a REG, 1 means the register is used only in an exit test of a loop. */
521 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
523 /* During sched, for an insn, 1 means that the insn must be scheduled together
524 with the preceding insn. */
525 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
527 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
528 cost of the dependence link. The cost of executing an instruction
529 may vary based on how the results are used. LINK_COST_ZERO is 1 when
530 the cost through the link varies and is unchanged (i.e., the link has
531 zero additional cost). LINK_COST_FREE is 1 when the cost through the
532 link is zero (i.e., the link makes the cost free). In other cases,
533 the adjustment to the cost is recomputed each time it is needed. */
534 #define LINK_COST_ZERO(X) ((X)->jump)
535 #define LINK_COST_FREE(X) ((X)->call)
537 /* For a SET rtx, SET_DEST is the place that is set
538 and SET_SRC is the value it is set to. */
539 #define SET_DEST(RTX) ((RTX)->fld[0].rtx)
540 #define SET_SRC(RTX) ((RTX)->fld[1].rtx)
542 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
543 #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
545 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
546 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
548 /* Flag in a SYMBOL_REF for machine-specific purposes. */
549 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
551 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
552 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
554 /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
555 of the function that is not involved in copying parameters to
556 pseudo-registers. FIRST_PARM_INSN is the very first insn of
557 the function, including the parameter copying.
558 We keep this around in case we must splice
559 this function into the assembly code at the end of the file.
560 FIRST_LABELNO is the first label number used by the function (inclusive).
561 LAST_LABELNO is the last label used by the function (exclusive).
562 MAX_REGNUM is the largest pseudo-register used by that function.
563 FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
564 POPS_ARGS is the number of bytes of input arguments popped by the function
565 STACK_SLOT_LIST is the list of stack slots.
566 FUNCTION_FLAGS are where single-bit flags are saved.
567 OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
568 ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
569 for the function arguments.
570 ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
573 We want this to lay down like an INSN. The PREV_INSN field
574 is always NULL. The NEXT_INSN field always points to the
575 first function insn of the function being squirreled away. */
577 #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
578 #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
579 #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
580 #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
581 #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
582 #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
583 #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
584 #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
585 #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
586 #define FUNCTION_FLAGS(RTX) ((RTX)->fld[11].rtint)
587 #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[12].rtint)
588 #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[13].rtvec)
589 #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[14].rtx)
591 /* In FUNCTION_FLAGS we save some variables computed when emitting the code
592 for the function and which must be `or'ed into the current flag values when
593 insns from that function are being inlined. */
595 /* These ought to be an enum, but non-ANSI compilers don't like that. */
596 #define FUNCTION_FLAGS_CALLS_ALLOCA 01
597 #define FUNCTION_FLAGS_CALLS_SETJMP 02
598 #define FUNCTION_FLAGS_RETURNS_STRUCT 04
599 #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
600 #define FUNCTION_FLAGS_NEEDS_CONTEXT 020
601 #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
602 #define FUNCTION_FLAGS_RETURNS_POINTER 0100
603 #define FUNCTION_FLAGS_USES_CONST_POOL 0200
604 #define FUNCTION_FLAGS_CALLS_LONGJMP 0400
605 #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000
607 /* Define a macro to look for REG_INC notes,
608 but save time on machines where they never exist. */
610 /* Don't continue this line--convex cc version 4.1 would lose. */
611 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
612 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
614 #define FIND_REG_INC_NOTE(insn, reg) 0
617 /* Indicate whether the machine has any sort of auto increment addressing.
618 If not, we can avoid checking for REG_INC notes. */
620 /* Don't continue this line--convex cc version 4.1 would lose. */
621 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
625 /* Generally useful functions. */
627 /* The following functions accept a wide integer argument. Rather than
628 having to cast on every function call, we use a macro instead, that is
629 defined here and in tree.h. */
632 #define exact_log2(N) exact_log2_wide ((HOST_WIDE_INT) (N))
633 #define floor_log2(N) floor_log2_wide ((HOST_WIDE_INT) (N))
636 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
638 #define plus_constant_for_output(X,C) \
639 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
641 extern rtx plus_constant_wide
PROTO((rtx
, HOST_WIDE_INT
));
642 extern rtx plus_constant_for_output_wide
PROTO((rtx
, HOST_WIDE_INT
));
644 #define GEN_INT(N) gen_rtx (CONST_INT, VOIDmode, (HOST_WIDE_INT) (N))
647 /* We cannot define prototypes for the variable argument functions,
648 since they have not been ANSI-fied, and an ANSI compiler would
649 complain when compiling the definition of these functions. */
651 extern rtx gen_rtx
PROTO((enum rtx_code
, enum machine_mode
, ...));
652 extern rtvec gen_rtvec
PROTO((int, ...));
655 extern rtx
bc_gen_rtx ();
656 extern rtx
gen_rtx ();
657 extern rtvec
gen_rtvec ();
660 #ifdef BUFSIZ /* stdio.h has been included */
661 extern rtx read_rtx
PROTO((FILE *));
663 extern rtx
read_rtx ();
667 /* At present, don't prototype xrealloc, since all of the callers don't
668 cast their pointers to char *, and all of the xrealloc's don't use
670 extern char *xmalloc
PROTO((size_t));
671 extern char *xrealloc
PROTO((void *, size_t));
673 extern char *xmalloc ();
674 extern char *xrealloc ();
677 extern char *oballoc
PROTO((int));
678 extern char *permalloc
PROTO((int));
679 extern void free
PROTO((void *));
680 extern rtx rtx_alloc
PROTO((RTX_CODE
));
681 extern rtvec rtvec_alloc
PROTO((int));
682 extern rtx find_reg_note
PROTO((rtx
, enum reg_note
, rtx
));
683 extern rtx find_regno_note
PROTO((rtx
, enum reg_note
, int));
684 extern HOST_WIDE_INT get_integer_term
PROTO((rtx
));
685 extern rtx get_related_value
PROTO((rtx
));
686 extern rtx single_set
PROTO((rtx
));
687 extern rtx find_last_value
PROTO((rtx
, rtx
*, rtx
));
688 extern rtx copy_rtx
PROTO((rtx
));
689 extern rtx copy_rtx_if_shared
PROTO((rtx
));
690 extern rtx copy_most_rtx
PROTO((rtx
, rtx
));
691 extern rtx replace_rtx
PROTO((rtx
, rtx
, rtx
));
692 extern rtvec gen_rtvec_v
PROTO((int, rtx
*));
693 extern rtx gen_reg_rtx
PROTO((enum machine_mode
));
694 extern rtx gen_label_rtx
PROTO((void));
695 extern rtx gen_inline_header_rtx
PROTO((rtx
, rtx
, int, int, int, int, int, int, rtx
, int, int, rtvec
, rtx
));
696 extern rtx gen_lowpart_common
PROTO((enum machine_mode
, rtx
));
697 extern rtx gen_lowpart
PROTO((enum machine_mode
, rtx
));
698 extern rtx gen_lowpart_if_possible
PROTO((enum machine_mode
, rtx
));
699 extern rtx gen_highpart
PROTO((enum machine_mode
, rtx
));
700 extern rtx gen_realpart
PROTO((enum machine_mode
, rtx
));
701 extern rtx gen_imagpart
PROTO((enum machine_mode
, rtx
));
702 extern rtx operand_subword
PROTO((rtx
, int, int, enum machine_mode
));
703 extern rtx operand_subword_force
PROTO((rtx
, int, enum machine_mode
));
704 extern int subreg_lowpart_p
PROTO((rtx
));
705 extern rtx make_safe_from
PROTO((rtx
, rtx
));
706 extern rtx memory_address
PROTO((enum machine_mode
, rtx
));
707 extern rtx get_insns
PROTO((void));
708 extern rtx get_last_insn
PROTO((void));
709 extern rtx get_last_insn_anywhere
PROTO((void));
710 extern void start_sequence
PROTO((void));
711 extern void push_to_sequence
PROTO((rtx
));
712 extern void end_sequence
PROTO((void));
713 extern rtx gen_sequence
PROTO((void));
714 extern rtx immed_double_const
PROTO((HOST_WIDE_INT
, HOST_WIDE_INT
, enum machine_mode
));
715 extern rtx force_const_mem
PROTO((enum machine_mode
, rtx
));
716 extern rtx force_reg
PROTO((enum machine_mode
, rtx
));
717 extern rtx get_pool_constant
PROTO((rtx
));
718 extern enum machine_mode get_pool_mode
PROTO((rtx
));
719 extern int get_pool_offset
PROTO((rtx
));
720 extern rtx simplify_subtraction
PROTO((rtx
));
721 extern rtx assign_stack_local
PROTO((enum machine_mode
, int, int));
722 extern rtx assign_stack_temp
PROTO((enum machine_mode
, int, int));
723 extern rtx protect_from_queue
PROTO((rtx
, int));
724 extern void emit_queue
PROTO((void));
725 extern rtx emit_move_insn
PROTO((rtx
, rtx
));
726 extern rtx emit_insn_before
PROTO((rtx
, rtx
));
727 extern rtx emit_jump_insn_before
PROTO((rtx
, rtx
));
728 extern rtx emit_call_insn_before
PROTO((rtx
, rtx
));
729 extern rtx emit_barrier_before
PROTO((rtx
));
730 extern rtx emit_note_before
PROTO((int, rtx
));
731 extern rtx emit_insn_after
PROTO((rtx
, rtx
));
732 extern rtx emit_jump_insn_after
PROTO((rtx
, rtx
));
733 extern rtx emit_barrier_after
PROTO((rtx
));
734 extern rtx emit_label_after
PROTO((rtx
, rtx
));
735 extern rtx emit_note_after
PROTO((int, rtx
));
736 extern rtx emit_line_note_after
PROTO((char *, int, rtx
));
737 extern rtx emit_insn
PROTO((rtx
));
738 extern rtx emit_insns
PROTO((rtx
));
739 extern rtx emit_insns_before
PROTO((rtx
, rtx
));
740 extern rtx emit_jump_insn
PROTO((rtx
));
741 extern rtx emit_call_insn
PROTO((rtx
));
742 extern rtx emit_label
PROTO((rtx
));
743 extern rtx emit_barrier
PROTO((void));
744 extern rtx emit_line_note
PROTO((char *, int));
745 extern rtx emit_note
PROTO((char *, int));
746 extern rtx emit_line_note_force
PROTO((char *, int));
747 extern rtx make_insn_raw
PROTO((rtx
));
748 extern rtx previous_insn
PROTO((rtx
));
749 extern rtx next_insn
PROTO((rtx
));
750 extern rtx prev_nonnote_insn
PROTO((rtx
));
751 extern rtx next_nonnote_insn
PROTO((rtx
));
752 extern rtx prev_real_insn
PROTO((rtx
));
753 extern rtx next_real_insn
PROTO((rtx
));
754 extern rtx prev_active_insn
PROTO((rtx
));
755 extern rtx next_active_insn
PROTO((rtx
));
756 extern rtx prev_label
PROTO((rtx
));
757 extern rtx next_label
PROTO((rtx
));
758 extern rtx next_cc0_user
PROTO((rtx
));
759 extern rtx prev_cc0_setter
PROTO((rtx
));
760 extern rtx reg_set_last
PROTO((rtx
, rtx
));
761 extern rtx next_nondeleted_insn
PROTO((rtx
));
762 extern enum rtx_code reverse_condition
PROTO((enum rtx_code
));
763 extern enum rtx_code swap_condition
PROTO((enum rtx_code
));
764 extern enum rtx_code unsigned_condition
PROTO((enum rtx_code
));
765 extern enum rtx_code signed_condition
PROTO((enum rtx_code
));
766 extern rtx find_equiv_reg
PROTO((rtx
, rtx
, enum reg_class
, int, short *, int, enum machine_mode
));
767 extern rtx squeeze_notes
PROTO((rtx
, rtx
));
768 extern rtx delete_insn
PROTO((rtx
));
769 extern void delete_jump
PROTO((rtx
));
770 extern rtx get_label_before
PROTO((rtx
));
771 extern rtx get_label_after
PROTO((rtx
));
772 extern rtx follow_jumps
PROTO((rtx
));
773 extern rtx adj_offsettable_operand
PROTO((rtx
, int));
774 extern rtx try_split
PROTO((rtx
, rtx
, int));
775 extern rtx split_insns
PROTO((rtx
, rtx
));
776 extern rtx simplify_unary_operation
PROTO((enum rtx_code
, enum machine_mode
, rtx
, enum machine_mode
));
777 extern rtx simplify_binary_operation
PROTO((enum rtx_code
, enum machine_mode
, rtx
, rtx
));
778 extern rtx simplify_ternary_operation
PROTO((enum rtx_code
, enum machine_mode
, enum machine_mode
, rtx
, rtx
, rtx
));
779 extern rtx simplify_relational_operation
PROTO((enum rtx_code
, enum machine_mode
, rtx
, rtx
));
780 extern rtx nonlocal_label_rtx_list
PROTO((void));
781 extern rtx gen_move_insn
PROTO((rtx
, rtx
));
782 extern rtx gen_jump
PROTO((rtx
));
783 extern rtx gen_beq
PROTO((rtx
));
784 extern rtx gen_bge
PROTO((rtx
));
785 extern rtx gen_ble
PROTO((rtx
));
786 extern rtx eliminate_constant_term
PROTO((rtx
, rtx
*));
787 extern rtx expand_complex_abs
PROTO((enum machine_mode
, rtx
, rtx
, int));
789 /* Maximum number of parallel sets and clobbers in any insn in this fn.
790 Always at least 3, since the combiner could put that many togetherm
791 and we want this to remain correct for all the remaining passes. */
793 extern int max_parallel
;
795 extern int asm_noperands
PROTO((rtx
));
796 extern char *decode_asm_operands
PROTO((rtx
, rtx
*, rtx
**, char **, enum machine_mode
*));
798 extern enum reg_class reg_preferred_class
PROTO((int));
799 extern enum reg_class reg_alternate_class
PROTO((int));
801 extern rtx get_first_nonparm_insn
PROTO((void));
803 /* Standard pieces of rtx, to be substituted directly into things. */
806 extern rtx const0_rtx
;
807 extern rtx const1_rtx
;
808 extern rtx const2_rtx
;
809 extern rtx constm1_rtx
;
810 extern rtx const_true_rtx
;
812 extern rtx const_tiny_rtx
[3][(int) MAX_MACHINE_MODE
];
814 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
817 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
819 /* Likewise, for the constants 1 and 2. */
821 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
822 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
824 /* All references to certain hard regs, except those created
825 by allocating pseudo regs into them (when that's possible),
826 go through these unique rtx objects. */
827 extern rtx stack_pointer_rtx
;
828 extern rtx frame_pointer_rtx
;
829 extern rtx hard_frame_pointer_rtx
;
830 extern rtx arg_pointer_rtx
;
831 extern rtx pic_offset_table_rtx
;
832 extern rtx struct_value_rtx
;
833 extern rtx struct_value_incoming_rtx
;
834 extern rtx static_chain_rtx
;
835 extern rtx static_chain_incoming_rtx
;
837 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
838 is used to represent the frame pointer. This is because the
839 hard frame pointer and the automatic variables are separated by an amount
840 that cannot be determined until after register allocation. We can assume
841 that in this case ELIMINABLE_REGS will be defined, one action of which
842 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
843 #ifndef HARD_FRAME_POINTER_REGNUM
844 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
847 /* Virtual registers are used during RTL generation to refer to locations into
848 the stack frame when the actual location isn't known until RTL generation
849 is complete. The routine instantiate_virtual_regs replaces these with
850 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
853 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
855 /* This points to the first word of the incoming arguments passed on the stack,
856 either by the caller or by the callee when pretending it was passed by the
859 extern rtx virtual_incoming_args_rtx
;
861 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
863 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
864 variable on the stack. Otherwise, it points to the first variable on
867 extern rtx virtual_stack_vars_rtx
;
869 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
871 /* This points to the location of dynamically-allocated memory on the stack
872 immediately after the stack pointer has been adjusted by the amount
875 extern rtx virtual_stack_dynamic_rtx
;
877 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
879 /* This points to the location in the stack at which outgoing arguments should
880 be written when the stack is pre-pushed (arguments pushed using push
881 insns always use sp). */
883 extern rtx virtual_outgoing_args_rtx
;
885 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
887 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 3)
889 extern rtx find_next_ref
PROTO((rtx
, rtx
));
890 extern rtx
*find_single_use
PROTO((rtx
, rtx
, rtx
*));
892 /* It is hard to write the prototype for expand_expr, since it needs
893 expr.h to be included for the enumeration. */
895 extern rtx
expand_expr ();
896 extern rtx
immed_real_const_1();
899 /* rtl.h and tree.h were included. */
900 extern rtx output_constant_def
PROTO((tree
));
901 extern rtx immed_real_const
PROTO((tree
));
902 extern rtx immed_real_const_1
PROTO((REAL_VALUE_TYPE
, enum machine_mode
));
903 extern tree make_tree
PROTO((tree
, rtx
));
906 extern rtx
output_constant_def ();
907 extern rtx
immed_real_const ();
908 extern rtx
immed_real_const_1 ();
911 /* Define a default value for STORE_FLAG_VALUE. */
913 #ifndef STORE_FLAG_VALUE
914 #define STORE_FLAG_VALUE 1
917 /* Nonzero after end of reload pass.
918 Set to 1 or 0 by toplev.c. */
920 extern int reload_completed
;
922 /* Set to 1 while reload_as_needed is operating.
923 Required by some machines to handle any generated moves differently. */
925 extern int reload_in_progress
;
927 /* If this is nonzero, we do not bother generating VOLATILE
928 around volatile memory references, and we are willing to
929 output indirect addresses. If cse is to follow, we reject
930 indirect addresses so a useful potential cse is generated;
931 if it is used only once, instruction combination will produce
932 the same indirect address eventually. */
933 extern int cse_not_expected
;
935 /* Indexed by pseudo register number, gives the rtx for that pseudo.
936 Allocated in parallel with regno_pointer_flag. */
937 extern rtx
*regno_reg_rtx
;
939 /* Translates rtx code to tree code, for those codes needed by
941 extern int rtx_to_tree_code ();