1 /* Register Transfer Language (RTL) definitions for GNU C-Compiler
2 Copyright (C) 1987, 1991, 1992 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. */
26 /* Register Transfer Language EXPRESSIONS CODES */
28 #define RTX_CODE enum rtx_code
31 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
32 #include "rtl.def" /* rtl expressions are documented here */
35 LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for
37 Assumes default enum value assignment. */
39 #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
40 /* The cast here, saves many elsewhere. */
42 extern int rtx_length[];
43 #define GET_RTX_LENGTH(CODE) (rtx_length[(int)(CODE)])
45 extern char *rtx_name[];
46 #define GET_RTX_NAME(CODE) (rtx_name[(int)(CODE)])
48 extern char *rtx_format[];
49 #define GET_RTX_FORMAT(CODE) (rtx_format[(int)(CODE)])
51 extern char rtx_class[];
52 #define GET_RTX_CLASS(CODE) (rtx_class[(int)(CODE)])
54 /* Common union for an element of an rtx. */
56 typedef union rtunion_def
62 struct rtvec_def *rtvec;
63 enum machine_mode rttype;
66 /* RTL expression ("rtx"). */
68 typedef struct rtx_def
70 #ifdef ONLY_INT_FIELDS
73 /* The kind of expression this is. */
74 enum rtx_code code : 16;
76 /* The kind of value the expression has. */
77 #ifdef ONLY_INT_FIELDS
80 enum machine_mode mode : 8;
82 /* 1 in an INSN if it can alter flow of control
83 within this function. Not yet used! */
84 unsigned int jump : 1;
85 /* 1 in an INSN if it can call another function. Not yet used! */
86 unsigned int call : 1;
87 /* 1 in a MEM or REG if value of this expression will never change
88 during the current function, even though it is not
90 1 in a SYMBOL_REF if it addresses something in the per-function
92 1 in a CALL_INSN if it is a const call.
93 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
94 reorg until end of compilation; cleared before used. */
95 unsigned int unchanging : 1;
96 /* 1 in a MEM expression if contents of memory are volatile.
97 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
99 1 in a REG expression if corresponds to a variable declared by the user.
100 0 for an internally generated temporary.
101 In a SYMBOL_REF, this flag is used for machine-specific purposes. */
102 unsigned int volatil : 1;
103 /* 1 in a MEM referring to a field of a structure (not a union!).
104 0 if the MEM was a variable or the result of a * operator in C;
105 1 if it was the result of a . or -> operator (on a struct) in C.
106 1 in a REG if the register is used only in exit code a loop.
107 1 in a CODE_LABEL if the label is used for nonlocal gotos
108 and must not be deleted even if its count is zero.
109 1 in a LABEL_REF if this is a reference to a label outside the
111 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
112 together with the preceding insn. Valid only within sched.
113 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
114 from the target of a branch. Valid from reorg until end of compilation;
115 cleared before used. */
116 unsigned int in_struct : 1;
117 /* 1 if this rtx is used. This is used for copying shared structure.
118 See `unshare_all_rtl'.
119 In a REG, this is not needed for that purpose, and used instead
120 in `leaf_renumber_regs_insn'.
121 In a SYMBOL_REF, means that emit_library_call
122 has used it as the function. */
123 unsigned int used : 1;
124 /* Nonzero if this rtx came from procedure integration.
125 In a REG, nonzero means this reg refers to the return value
126 of the current function. */
127 unsigned integrated : 1;
128 /* The first element of the operands of this rtx.
129 The number of operands and their types are controlled
130 by the `code' field, according to rtl.def. */
134 /* Add prototype support. */
136 #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
137 #define PROTO(ARGS) ARGS
139 #define PROTO(ARGS) ()
143 #define NULL_RTX (rtx) 0
145 /* Define a generic NULL if one hasn't already been defined. */
152 #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
153 #define GENERIC_PTR void *
155 #define GENERIC_PTR char *
160 #define NULL_PTR ((GENERIC_PTR)0)
163 /* Define macros to access the `code' field of the rtx. */
165 #ifdef SHORT_ENUM_BUG
166 #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code))
167 #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE)))
169 #define GET_CODE(RTX) ((RTX)->code)
170 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
173 #define GET_MODE(RTX) ((RTX)->mode)
174 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
176 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
177 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
179 /* RTL vector. These appear inside RTX's when there is a need
180 for a variable number of things. The principle use is inside
181 PARALLEL expressions. */
183 typedef struct rtvec_def{
184 unsigned num_elem; /* number of elements */
188 #define NULL_RTVEC (rtvec) 0
190 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
191 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (unsigned) NUM)
193 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx)
195 /* 1 if X is a REG. */
197 #define REG_P(X) (GET_CODE (X) == REG)
199 /* 1 if X is a constant value that is an integer. */
201 #define CONSTANT_P(X) \
202 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
203 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
204 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH)
206 /* General accessor macros for accessing the fields of an rtx. */
208 #define XEXP(RTX, N) ((RTX)->fld[N].rtx)
209 #define XINT(RTX, N) ((RTX)->fld[N].rtint)
210 #define XWINT(RTX, N) ((RTX)->fld[N].rtwint)
211 #define XSTR(RTX, N) ((RTX)->fld[N].rtstr)
212 #define XVEC(RTX, N) ((RTX)->fld[N].rtvec)
213 #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
214 #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
216 /* ACCESS MACROS for particular fields of insns. */
218 /* Holds a unique number for each insn.
219 These are not necessarily sequentially increasing. */
220 #define INSN_UID(INSN) ((INSN)->fld[0].rtint)
222 /* Chain insns together in sequence. */
223 #define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
224 #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
226 /* The body of an insn. */
227 #define PATTERN(INSN) ((INSN)->fld[3].rtx)
229 /* Code number of instruction, from when it was recognized.
230 -1 means this instruction has not been recognized yet. */
231 #define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
233 /* Set up in flow.c; empty before then.
234 Holds a chain of INSN_LIST rtx's whose first operands point at
235 previous insns with direct data-flow connections to this one.
236 That means that those insns set variables whose next use is in this insn.
237 They are always in the same basic block as this insn. */
238 #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx)
240 /* 1 if insn has been deleted. */
241 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
243 /* 1 if insn is a call to a const function. */
244 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
246 /* 1 if insn is a branch that should not unconditionally execute its
247 delay slots, i.e., it is an annulled branch. */
248 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
250 /* 1 if insn is in a delay slot and is from the target of the branch. If
251 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
252 executed if the branch is taken. For annulled branches with this bit
253 clear, the insn should be executed only if the branch is not taken. */
254 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
256 /* Holds a list of notes on what this insn does to various REGs.
257 It is a chain of EXPR_LIST rtx's, where the second operand
258 is the chain pointer and the first operand is the REG being described.
259 The mode field of the EXPR_LIST contains not a real machine mode
260 but a value that says what this note says about the REG:
261 REG_DEAD means that the value in REG dies in this insn (i.e., it is
262 not needed past this insn). If REG is set in this insn, the REG_DEAD
263 note may, but need not, be omitted.
264 REG_INC means that the REG is autoincremented or autodecremented.
265 REG_EQUIV describes the insn as a whole; it says that the
266 insn sets a register to a constant value or to be equivalent to
267 a memory address. If the
268 register is spilled to the stack then the constant value
269 should be substituted for it. The contents of the REG_EQUIV
270 is the constant value or memory address, which may be different
271 from the source of the SET although it has the same value.
272 REG_EQUAL is like REG_EQUIV except that the destination
273 is only momentarily equal to the specified rtx. Therefore, it
274 cannot be used for substitution; but it can be used for cse.
275 REG_RETVAL means that this insn copies the return-value of
276 a library call out of the hard reg for return values. This note
277 is actually an INSN_LIST and it points to the first insn involved
278 in setting up arguments for the call. flow.c uses this to delete
279 the entire library call when its result is dead.
280 REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn
281 of the library call and points at the one that has the REG_RETVAL.
282 REG_WAS_0 says that the register set in this insn held 0 before the insn.
283 The contents of the note is the insn that stored the 0.
284 If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative.
285 The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST.
286 REG_NONNEG means that the register is always nonnegative during
287 the containing loop. This is used in branches so that decrement and
288 branch instructions terminating on zero can be matched. There must be
289 an insn pattern in the md file named `decrement_and_branch_until_zero'
290 or else this will never be added to any instructions.
291 REG_NO_CONFLICT means there is no conflict *after this insn*
292 between the register in the note and the destination of this insn.
293 REG_UNUSED identifies a register set in this insn and never used.
294 REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
295 CC0, respectively. Normally, these are required to be consecutive insns,
296 but we permit putting a cc0-setting insn in the delay slot of a branch
297 as long as only one copy of the insn exists. In that case, these notes
298 point from one to the other to allow code generation to determine what
299 any require information and to properly update CC_STATUS.
300 REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to
301 say that the CODE_LABEL contained in the REG_LABEL note is used
303 REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
304 dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output
305 (write after write) dependencies. Data dependencies, which are the only
306 type of LOG_LINK created by flow, are represented by a 0 reg note kind. */
308 #define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
310 /* Don't forget to change reg_note_name in rtl.c. */
311 enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
312 REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7,
313 REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
314 REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
315 REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15 };
317 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
318 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
319 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
321 /* Names for REG_NOTE's in EXPR_LIST insn's. */
323 extern char *reg_note_name[];
324 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int)(MODE)])
326 /* The label-number of a code-label. The assembler label
327 is made from `L' and the label-number printed in decimal.
328 Label numbers are unique in a compilation. */
329 #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint)
331 #define LINE_NUMBER NOTE
333 /* In a NOTE that is a line number, this is a string for the file name
334 that the line is in. We use the same field to record block numbers
335 temporarily in NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.
336 (We avoid lots of casts between ints and pointers if we use a
337 different macro for the bock number.) */
339 #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr)
340 #define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint)
342 /* In a NOTE that is a line number, this is the line number.
343 Other kinds of NOTEs are identified by negative numbers here. */
344 #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)
346 /* Codes that appear in the NOTE_LINE_NUMBER field
347 for kinds of notes that are not line numbers. */
349 /* This note indicates the end of the real body of the function,
350 after moving the parms into their homes, etc. */
351 #define NOTE_INSN_FUNCTION_BEG 0
353 /* This note is used to get rid of an insn
354 when it isn't safe to patch the insn out of the chain. */
355 #define NOTE_INSN_DELETED -1
356 #define NOTE_INSN_BLOCK_BEG -2
357 #define NOTE_INSN_BLOCK_END -3
358 #define NOTE_INSN_LOOP_BEG -4
359 #define NOTE_INSN_LOOP_END -5
360 /* This kind of note is generated at the end of the function body,
361 just before the return insn or return label.
362 In an optimizing compilation it is deleted by the first jump optimization,
363 after enabling that optimizer to determine whether control can fall
364 off the end of the function body without a return statement. */
365 #define NOTE_INSN_FUNCTION_END -6
366 /* This kind of note is generated just after each call to `setjmp', et al. */
367 #define NOTE_INSN_SETJMP -7
368 /* Generated at the place in a loop that `continue' jumps to. */
369 #define NOTE_INSN_LOOP_CONT -8
370 /* Generated at the start of a duplicated exit test. */
371 #define NOTE_INSN_LOOP_VTOP -9
372 /* This marks the point immediately after the last prologue insn. */
373 #define NOTE_INSN_PROLOGUE_END -10
374 /* This marks the point immediately prior to the first epilogue insn. */
375 #define NOTE_INSN_EPILOGUE_BEG -11
376 /* Generated in place of user-declared labels when they are deleted. */
377 #define NOTE_INSN_DELETED_LABEL -12
378 /* Don't forget to change note_insn_name in rtl.c. */
381 #if 0 /* These are not used, and I don't know what they were for. --rms. */
382 #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
383 #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
384 #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
385 #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
386 #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
389 /* Names for NOTE insn's other than line numbers. */
391 extern char *note_insn_name[];
392 #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
394 /* The name of a label, in case it corresponds to an explicit label
395 in the input source code. */
396 #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
398 /* In jump.c, each label contains a count of the number
399 of LABEL_REFs that point at it, so unused labels can be deleted. */
400 #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
402 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
403 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
404 be decremented and possibly the label can be deleted. */
405 #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx)
407 /* Once basic blocks are found in flow.c,
408 each CODE_LABEL starts a chain that goes through
409 all the LABEL_REFs that jump to that label.
410 The chain eventually winds up at the CODE_LABEL; it is circular. */
411 #define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx)
413 /* This is the field in the LABEL_REF through which the circular chain
414 of references to a particular label is linked.
415 This chain is set up in flow.c. */
417 #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
419 /* Once basic blocks are found in flow.c,
420 Each LABEL_REF points to its containing instruction with this field. */
422 #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
424 /* For a REG rtx, REGNO extracts the register number. */
426 #define REGNO(RTX) ((RTX)->fld[0].rtint)
428 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
429 is the current function's return value. */
431 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
433 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
434 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
436 /* For a CONST_INT rtx, INTVAL extracts the integer. */
438 #define INTVAL(RTX) ((RTX)->fld[0].rtwint)
440 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
441 SUBREG_WORD extracts the word-number. */
443 #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
444 #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
446 /* Access various components of an ASM_OPERANDS rtx. */
448 #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
449 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
450 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
451 #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
452 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
453 #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
454 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
455 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
456 #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
457 #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
458 #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
460 /* For a MEM rtx, 1 if it's a volatile reference.
461 Also in an ASM_OPERANDS rtx. */
462 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
464 /* For a MEM rtx, 1 if it refers to a structure or union component. */
465 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
467 /* For a LABEL_REF, 1 means that this reference is to a label outside the
468 loop containing the reference. */
469 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
471 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
472 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
474 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
475 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
477 /* For a REG, 1 means the register is used only in an exit test of a loop. */
478 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
480 /* During sched, for an insn, 1 means that the insn must be scheduled together
481 with the preceding insn. */
482 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
484 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
485 cost of the dependence link. The cost of executing an instruction
486 may vary based on how the results are used. LINK_COST_ZERO is 1 when
487 the cost through the link varies and is unchanged (i.e., the link has
488 zero additional cost). LINK_COST_FREE is 1 when the cost through the
489 link is zero (i.e., the link makes the cost free). In other cases,
490 the adjustment to the cost is recomputed each time it is needed. */
491 #define LINK_COST_ZERO(X) ((X)->jump)
492 #define LINK_COST_FREE(X) ((X)->call)
494 /* For a SET rtx, SET_DEST is the place that is set
495 and SET_SRC is the value it is set to. */
496 #define SET_DEST(RTX) ((RTX)->fld[0].rtx)
497 #define SET_SRC(RTX) ((RTX)->fld[1].rtx)
499 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
500 #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
502 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
503 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
505 /* Flag in a SYMBOL_REF for machine-specific purposes. */
506 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
508 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
509 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
511 /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
512 of the function that is not involved in copying parameters to
513 pseudo-registers. FIRST_PARM_INSN is the very first insn of
514 the function, including the parameter copying.
515 We keep this around in case we must splice
516 this function into the assembly code at the end of the file.
517 FIRST_LABELNO is the first label number used by the function (inclusive).
518 LAST_LABELNO is the last label used by the function (exclusive).
519 MAX_REGNUM is the largest pseudo-register used by that function.
520 FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
521 POPS_ARGS is the number of bytes of input arguments popped by the function
522 STACK_SLOT_LIST is the list of stack slots.
523 FUNCTION_FLAGS are where single-bit flags are saved.
524 OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
525 ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
526 for the function arguments.
527 ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
530 We want this to lay down like an INSN. The PREV_INSN field
531 is always NULL. The NEXT_INSN field always points to the
532 first function insn of the function being squirreled away. */
534 #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
535 #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
536 #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
537 #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
538 #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
539 #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
540 #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
541 #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
542 #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
543 #define FUNCTION_FLAGS(RTX) ((RTX)->fld[11].rtint)
544 #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[12].rtint)
545 #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[13].rtvec)
546 #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[14].rtx)
548 /* In FUNCTION_FLAGS we save some variables computed when emitting the code
549 for the function and which must be `or'ed into the current flag values when
550 insns from that function are being inlined. */
552 /* These ought to be an enum, but non-ANSI compilers don't like that. */
553 #define FUNCTION_FLAGS_CALLS_ALLOCA 01
554 #define FUNCTION_FLAGS_CALLS_SETJMP 02
555 #define FUNCTION_FLAGS_RETURNS_STRUCT 04
556 #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
557 #define FUNCTION_FLAGS_NEEDS_CONTEXT 020
558 #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
559 #define FUNCTION_FLAGS_RETURNS_POINTER 0100
560 #define FUNCTION_FLAGS_USES_CONST_POOL 0200
561 #define FUNCTION_FLAGS_CALLS_LONGJMP 0400
562 #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000
564 /* Define a macro to look for REG_INC notes,
565 but save time on machines where they never exist. */
567 /* Don't continue this line--convex cc version 4.1 would lose. */
568 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
569 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
571 #define FIND_REG_INC_NOTE(insn, reg) 0
574 /* Indicate whether the machine has any sort of auto increment addressing.
575 If not, we can avoid checking for REG_INC notes. */
577 /* Don't continue this line--convex cc version 4.1 would lose. */
578 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
582 /* Generally useful functions. */
584 /* The following functions accept a wide integer argument. Rather than
585 having to cast on every function call, we use a macro instead, that is
586 defined here and in tree.h. */
589 #define exact_log2(N) exact_log2_wide ((HOST_WIDE_INT) (N))
590 #define floor_log2(N) floor_log2_wide ((HOST_WIDE_INT) (N))
593 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
595 #define plus_constant_for_output(X,C) \
596 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
598 extern rtx plus_constant_wide PROTO((rtx, HOST_WIDE_INT));
599 extern rtx plus_constant_for_output_wide PROTO((rtx, HOST_WIDE_INT));
601 #define GEN_INT(N) gen_rtx (CONST_INT, VOIDmode, (N))
604 /* We cannot define prototypes for the variable argument functions,
605 since they have not been ANSI-fied, and an ANSI compiler would
606 complain when compiling the definition of these functions. */
608 extern rtx gen_rtx PROTO((enum rtx_code, enum machine_mode, ...));
609 extern rtvec gen_rtvec PROTO((int, ...));
612 extern rtx gen_rtx ();
613 extern rtvec gen_rtvec ();
616 #ifdef BUFSIZ /* stdio.h has been included */
617 extern rtx read_rtx PROTO((FILE *));
619 extern rtx read_rtx ();
623 /* At present, don't prototype xrealloc, since all of the callers don't
624 cast their pointers to char *, and all of the xrealloc's don't use
626 extern char *xrealloc PROTO((void *, unsigned));
628 extern char *xrealloc ();
631 extern char *xmalloc PROTO((unsigned));
632 extern char *oballoc PROTO((int));
633 extern char *permalloc PROTO((int));
634 extern void free PROTO((void *));
635 extern rtx rtx_alloc PROTO((RTX_CODE));
636 extern rtvec rtvec_alloc PROTO((int));
637 extern rtx find_reg_note PROTO((rtx, enum reg_note, rtx));
638 extern rtx find_regno_note PROTO((rtx, enum reg_note, int));
639 extern HOST_WIDE_INT get_integer_term PROTO((rtx));
640 extern rtx get_related_value PROTO((rtx));
641 extern rtx single_set PROTO((rtx));
642 extern rtx find_last_value PROTO((rtx, rtx *, rtx));
643 extern rtx copy_rtx PROTO((rtx));
644 extern rtx copy_rtx_if_shared PROTO((rtx));
645 extern rtx copy_most_rtx PROTO((rtx, rtx));
646 extern rtx replace_rtx PROTO((rtx, rtx, rtx));
647 extern rtvec gen_rtvec_v PROTO((int, rtx *));
648 extern rtx gen_reg_rtx PROTO((enum machine_mode));
649 extern rtx gen_label_rtx PROTO((void));
650 extern rtx gen_inline_header_rtx PROTO((rtx, rtx, int, int, int, int, int, int, rtx, int, int, rtvec, rtx));
651 extern rtx gen_lowpart_common PROTO((enum machine_mode, rtx));
652 extern rtx gen_lowpart PROTO((enum machine_mode, rtx));
653 extern rtx gen_lowpart_if_possible PROTO((enum machine_mode, rtx));
654 extern rtx gen_highpart PROTO((enum machine_mode, rtx));
655 extern rtx operand_subword PROTO((rtx, int, int, enum machine_mode));
656 extern rtx operand_subword_force PROTO((rtx, int, enum machine_mode));
657 extern int subreg_lowpart_p PROTO((rtx));
658 extern rtx make_safe_from PROTO((rtx, rtx));
659 extern rtx memory_address PROTO((enum machine_mode, rtx));
660 extern rtx get_insns PROTO((void));
661 extern rtx get_last_insn PROTO((void));
662 extern rtx get_last_insn_anywhere PROTO((void));
663 extern void start_sequence PROTO((void));
664 extern void push_to_sequence PROTO((rtx));
665 extern void end_sequence PROTO((void));
666 extern rtx gen_sequence PROTO((void));
667 extern rtx immed_double_const PROTO((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
668 extern rtx force_const_mem PROTO((enum machine_mode, rtx));
669 extern rtx force_reg PROTO((enum machine_mode, rtx));
670 extern rtx get_pool_constant PROTO((rtx));
671 extern enum machine_mode get_pool_mode PROTO((rtx));
672 extern int get_pool_offset PROTO((rtx));
673 extern rtx assign_stack_local PROTO((enum machine_mode, int, int));
674 extern rtx assign_stack_temp PROTO((enum machine_mode, int, int));
675 extern rtx protect_from_queue PROTO((rtx, int));
676 extern void emit_queue PROTO((void));
677 extern rtx emit_move_insn PROTO((rtx, rtx));
678 extern rtx emit_insn_before PROTO((rtx, rtx));
679 extern rtx emit_jump_insn_before PROTO((rtx, rtx));
680 extern rtx emit_call_insn_before PROTO((rtx, rtx));
681 extern rtx emit_barrier_before PROTO((rtx));
682 extern rtx emit_note_before PROTO((int, rtx));
683 extern rtx emit_insn_after PROTO((rtx, rtx));
684 extern rtx emit_jump_insn_after PROTO((rtx, rtx));
685 extern rtx emit_barrier_after PROTO((rtx));
686 extern rtx emit_label_after PROTO((rtx, rtx));
687 extern rtx emit_note_after PROTO((int, rtx));
688 extern rtx emit_line_note_after PROTO((char *, int, rtx));
689 extern rtx emit_insn PROTO((rtx));
690 extern rtx emit_insns PROTO((rtx));
691 extern rtx emit_insns_before PROTO((rtx, rtx));
692 extern rtx emit_jump_insn PROTO((rtx));
693 extern rtx emit_call_insn PROTO((rtx));
694 extern rtx emit_label PROTO((rtx));
695 extern rtx emit_barrier PROTO((void));
696 extern rtx emit_line_note PROTO((char *, int));
697 extern rtx emit_note PROTO((char *, int));
698 extern rtx emit_line_note_force PROTO((char *, int));
699 extern rtx make_insn_raw PROTO((rtx));
700 extern rtx previous_insn PROTO((rtx));
701 extern rtx next_insn PROTO((rtx));
702 extern rtx prev_nonnote_insn PROTO((rtx));
703 extern rtx next_nonnote_insn PROTO((rtx));
704 extern rtx prev_real_insn PROTO((rtx));
705 extern rtx next_real_insn PROTO((rtx));
706 extern rtx prev_active_insn PROTO((rtx));
707 extern rtx next_active_insn PROTO((rtx));
708 extern rtx prev_label PROTO((rtx));
709 extern rtx next_label PROTO((rtx));
710 extern rtx next_cc0_user PROTO((rtx));
711 extern rtx prev_cc0_setter PROTO((rtx));
712 extern rtx reg_set_last PROTO((rtx, rtx));
713 extern rtx next_nondeleted_insn PROTO((rtx));
714 extern enum rtx_code reverse_condition PROTO((enum rtx_code));
715 extern enum rtx_code swap_condition PROTO((enum rtx_code));
716 extern enum rtx_code unsigned_condition PROTO((enum rtx_code));
717 extern enum rtx_code signed_condition PROTO((enum rtx_code));
718 extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode));
719 extern rtx squeeze_notes PROTO((rtx, rtx));
720 extern rtx delete_insn PROTO((rtx));
721 extern void delete_jump PROTO((rtx));
722 extern rtx get_label_before PROTO((rtx));
723 extern rtx get_label_after PROTO((rtx));
724 extern rtx follow_jumps PROTO((rtx));
725 extern rtx adj_offsettable_operand PROTO((rtx, int));
726 extern rtx try_split PROTO((rtx, rtx, int));
727 extern rtx split_insns PROTO((rtx, rtx));
728 extern rtx simplify_unary_operation PROTO((enum rtx_code, enum machine_mode, rtx, enum machine_mode));
729 extern rtx simplify_binary_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
730 extern rtx simplify_ternary_operation PROTO((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx));
731 extern rtx simplify_relational_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
732 extern rtx nonlocal_label_rtx_list PROTO((void));
733 extern rtx gen_move_insn PROTO((rtx, rtx));
734 extern rtx gen_jump PROTO((rtx));
735 extern rtx gen_beq PROTO((rtx));
736 extern rtx gen_bge PROTO((rtx));
737 extern rtx gen_ble PROTO((rtx));
738 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
740 /* Maximum number of parallel sets and clobbers in any insn in this fn.
741 Always at least 3, since the combiner could put that many togetherm
742 and we want this to remain correct for all the remaining passes. */
744 extern int max_parallel;
746 extern int asm_noperands PROTO((rtx));
747 extern char *decode_asm_operands PROTO((rtx, rtx *, rtx **, char **, enum machine_mode *));
749 extern enum reg_class reg_preferred_class PROTO((int));
750 extern enum reg_class reg_alternate_class PROTO((int));
752 extern rtx get_first_nonparm_insn PROTO((void));
754 /* Standard pieces of rtx, to be substituted directly into things. */
757 extern rtx const0_rtx;
758 extern rtx const1_rtx;
759 extern rtx const2_rtx;
760 extern rtx constm1_rtx;
761 extern rtx const_true_rtx;
763 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
765 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
768 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
770 /* Likewise, for the constants 1 and 2. */
772 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
773 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
775 /* All references to certain hard regs, except those created
776 by allocating pseudo regs into them (when that's possible),
777 go through these unique rtx objects. */
778 extern rtx stack_pointer_rtx;
779 extern rtx frame_pointer_rtx;
780 extern rtx arg_pointer_rtx;
781 extern rtx pic_offset_table_rtx;
782 extern rtx struct_value_rtx;
783 extern rtx struct_value_incoming_rtx;
784 extern rtx static_chain_rtx;
785 extern rtx static_chain_incoming_rtx;
787 /* Virtual registers are used during RTL generation to refer to locations into
788 the stack frame when the actual location isn't known until RTL generation
789 is complete. The routine instantiate_virtual_regs replaces these with
790 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
793 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
795 /* This points to the first word of the incoming arguments passed on the stack,
796 either by the caller or by the callee when pretending it was passed by the
799 extern rtx virtual_incoming_args_rtx;
801 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
803 /* If FRAME_GROWS_DOWNWARDS, this points to immediately above the first
804 variable on the stack. Otherwise, it points to the first variable on
807 extern rtx virtual_stack_vars_rtx;
809 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
811 /* This points to the location of dynamically-allocated memory on the stack
812 immediately after the stack pointer has been adjusted by the amount
815 extern rtx virtual_stack_dynamic_rtx;
817 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
819 /* This points to the location in the stack at which outgoing arguments should
820 be written when the stack is pre-pushed (arguments pushed using push
821 insns always use sp). */
823 extern rtx virtual_outgoing_args_rtx;
825 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
827 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 3)
829 extern rtx find_next_ref PROTO((rtx, rtx));
830 extern rtx *find_single_use PROTO((rtx, rtx, rtx *));
832 /* It is hard to write the prototype for expand_expr, since it needs
833 expr.h to be included for the enumeration. */
835 extern rtx expand_expr ();
836 extern rtx immed_real_const_1();
839 /* rtl.h and tree.h were included. */
840 extern rtx output_constant_def PROTO((tree));
841 extern rtx immed_real_const PROTO((tree));
842 extern rtx immed_real_const_1 PROTO((REAL_VALUE_TYPE, enum machine_mode));
843 extern tree make_tree PROTO((tree, rtx));
846 extern rtx output_constant_def ();
847 extern rtx immed_real_const ();
848 extern rtx immed_real_const_1 ();
851 /* Define a default value for STORE_FLAG_VALUE. */
853 #ifndef STORE_FLAG_VALUE
854 #define STORE_FLAG_VALUE 1
857 /* Nonzero after end of reload pass.
858 Set to 1 or 0 by toplev.c. */
860 extern int reload_completed;
862 /* Set to 1 while reload_as_needed is operating.
863 Required by some machines to handle any generated moves differently. */
865 extern int reload_in_progress;
867 /* If this is nonzero, we do not bother generating VOLATILE
868 around volatile memory references, and we are willing to
869 output indirect addresses. If cse is to follow, we reject
870 indirect addresses so a useful potential cse is generated;
871 if it is used only once, instruction combination will produce
872 the same indirect address eventually. */
873 extern int cse_not_expected;
875 /* Indexed by pseudo register number, gives the rtx for that pseudo.
876 Allocated in parallel with regno_pointer_flag. */
877 extern rtx *regno_reg_rtx;