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 #define NULL_RTX (rtx) 0
136 /* Define a generic NULL if one hasn't already been defined. */
143 #define NULL_PTR (char *) NULL
146 /* Define macros to access the `code' field of the rtx. */
148 #ifdef SHORT_ENUM_BUG
149 #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code))
150 #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE)))
152 #define GET_CODE(RTX) ((RTX)->code)
153 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
156 #define GET_MODE(RTX) ((RTX)->mode)
157 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
159 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
160 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
162 /* RTL vector. These appear inside RTX's when there is a need
163 for a variable number of things. The principle use is inside
164 PARALLEL expressions. */
166 typedef struct rtvec_def{
167 unsigned num_elem; /* number of elements */
171 #define NULL_RTVEC (rtvec) 0
173 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
174 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (unsigned) NUM)
176 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx)
178 /* 1 if X is a REG. */
180 #define REG_P(X) (GET_CODE (X) == REG)
182 /* 1 if X is a constant value that is an integer. */
184 #define CONSTANT_P(X) \
185 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
186 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
187 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH)
189 /* General accessor macros for accessing the fields of an rtx. */
191 #define XEXP(RTX, N) ((RTX)->fld[N].rtx)
192 #define XINT(RTX, N) ((RTX)->fld[N].rtint)
193 #define XWINT(RTX, N) ((RTX)->fld[N].rtwint)
194 #define XSTR(RTX, N) ((RTX)->fld[N].rtstr)
195 #define XVEC(RTX, N) ((RTX)->fld[N].rtvec)
196 #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
197 #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
199 /* ACCESS MACROS for particular fields of insns. */
201 /* Holds a unique number for each insn.
202 These are not necessarily sequentially increasing. */
203 #define INSN_UID(INSN) ((INSN)->fld[0].rtint)
205 /* Chain insns together in sequence. */
206 #define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
207 #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
209 /* The body of an insn. */
210 #define PATTERN(INSN) ((INSN)->fld[3].rtx)
212 /* Code number of instruction, from when it was recognized.
213 -1 means this instruction has not been recognized yet. */
214 #define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
216 /* Set up in flow.c; empty before then.
217 Holds a chain of INSN_LIST rtx's whose first operands point at
218 previous insns with direct data-flow connections to this one.
219 That means that those insns set variables whose next use is in this insn.
220 They are always in the same basic block as this insn. */
221 #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx)
223 /* 1 if insn has been deleted. */
224 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
226 /* 1 if insn is a call to a const function. */
227 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
229 /* 1 if insn is a branch that should not unconditionally execute its
230 delay slots, i.e., it is an annulled branch. */
231 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
233 /* 1 if insn is in a delay slot and is from the target of the branch. If
234 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
235 executed if the branch is taken. For annulled branches with this bit
236 clear, the insn should be executed only if the branch is not taken. */
237 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
239 /* Holds a list of notes on what this insn does to various REGs.
240 It is a chain of EXPR_LIST rtx's, where the second operand
241 is the chain pointer and the first operand is the REG being described.
242 The mode field of the EXPR_LIST contains not a real machine mode
243 but a value that says what this note says about the REG:
244 REG_DEAD means that the value in REG dies in this insn (i.e., it is
245 not needed past this insn). If REG is set in this insn, the REG_DEAD
246 note may, but need not, be omitted.
247 REG_INC means that the REG is autoincremented or autodecremented.
248 REG_EQUIV describes the insn as a whole; it says that the
249 insn sets a register to a constant value or to be equivalent to
250 a memory address. If the
251 register is spilled to the stack then the constant value
252 should be substituted for it. The contents of the REG_EQUIV
253 is the constant value or memory address, which may be different
254 from the source of the SET although it has the same value.
255 REG_EQUAL is like REG_EQUIV except that the destination
256 is only momentarily equal to the specified rtx. Therefore, it
257 cannot be used for substitution; but it can be used for cse.
258 REG_RETVAL means that this insn copies the return-value of
259 a library call out of the hard reg for return values. This note
260 is actually an INSN_LIST and it points to the first insn involved
261 in setting up arguments for the call. flow.c uses this to delete
262 the entire library call when its result is dead.
263 REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn
264 of the library call and points at the one that has the REG_RETVAL.
265 REG_WAS_0 says that the register set in this insn held 0 before the insn.
266 The contents of the note is the insn that stored the 0.
267 If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative.
268 The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST.
269 REG_NONNEG means that the register is always nonnegative during
270 the containing loop. This is used in branches so that decrement and
271 branch instructions terminating on zero can be matched. There must be
272 an insn pattern in the md file named `decrement_and_branch_until_zero'
273 or else this will never be added to any instructions.
274 REG_NO_CONFLICT means there is no conflict *after this insn*
275 between the register in the note and the destination of this insn.
276 REG_UNUSED identifies a register set in this insn and never used.
277 REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
278 CC0, respectively. Normally, these are required to be consecutive insns,
279 but we permit putting a cc0-setting insn in the delay slot of a branch
280 as long as only one copy of the insn exists. In that case, these notes
281 point from one to the other to allow code generation to determine what
282 any require information and to properly update CC_STATUS.
283 REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to
284 say that the CODE_LABEL contained in the REG_LABEL note is used
286 REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
287 dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output
288 (write after write) dependencies. Data dependencies, which are the only
289 type of LOG_LINK created by flow, are represented by a 0 reg note kind. */
291 #define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
293 /* Don't forget to change reg_note_name in rtl.c. */
294 enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
295 REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7,
296 REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
297 REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
298 REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15 };
300 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
301 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
302 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
304 /* Names for REG_NOTE's in EXPR_LIST insn's. */
306 extern char *reg_note_name[];
307 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int)(MODE)])
309 /* The label-number of a code-label. The assembler label
310 is made from `L' and the label-number printed in decimal.
311 Label numbers are unique in a compilation. */
312 #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint)
314 #define LINE_NUMBER NOTE
316 /* In a NOTE that is a line number, this is a string for the file name
317 that the line is in. We use the same field to record block numbers
318 temporarily in NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.
319 (We avoid lots of casts between ints and pointers if we use a
320 different macro for the bock number.) */
322 #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr)
323 #define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint)
325 /* In a NOTE that is a line number, this is the line number.
326 Other kinds of NOTEs are identified by negative numbers here. */
327 #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)
329 /* Codes that appear in the NOTE_LINE_NUMBER field
330 for kinds of notes that are not line numbers. */
332 /* This note indicates the end of the real body of the function,
333 after moving the parms into their homes, etc. */
334 #define NOTE_INSN_FUNCTION_BEG 0
336 /* This note is used to get rid of an insn
337 when it isn't safe to patch the insn out of the chain. */
338 #define NOTE_INSN_DELETED -1
339 #define NOTE_INSN_BLOCK_BEG -2
340 #define NOTE_INSN_BLOCK_END -3
341 #define NOTE_INSN_LOOP_BEG -4
342 #define NOTE_INSN_LOOP_END -5
343 /* This kind of note is generated at the end of the function body,
344 just before the return insn or return label.
345 In an optimizing compilation it is deleted by the first jump optimization,
346 after enabling that optimizer to determine whether control can fall
347 off the end of the function body without a return statement. */
348 #define NOTE_INSN_FUNCTION_END -6
349 /* This kind of note is generated just after each call to `setjmp', et al. */
350 #define NOTE_INSN_SETJMP -7
351 /* Generated at the place in a loop that `continue' jumps to. */
352 #define NOTE_INSN_LOOP_CONT -8
353 /* Generated at the start of a duplicated exit test. */
354 #define NOTE_INSN_LOOP_VTOP -9
355 /* This marks the point immediately after the last prologue insn. */
356 #define NOTE_INSN_PROLOGUE_END -10
357 /* This marks the point immediately prior to the first epilogue insn. */
358 #define NOTE_INSN_EPILOGUE_BEG -11
359 /* Generated in place of user-declared labels when they are deleted. */
360 #define NOTE_INSN_DELETED_LABEL -12
361 /* Don't forget to change note_insn_name in rtl.c. */
364 #if 0 /* These are not used, and I don't know what they were for. --rms. */
365 #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
366 #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
367 #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
368 #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
369 #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
372 /* Names for NOTE insn's other than line numbers. */
374 extern char *note_insn_name[];
375 #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
377 /* The name of a label, in case it corresponds to an explicit label
378 in the input source code. */
379 #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
381 /* In jump.c, each label contains a count of the number
382 of LABEL_REFs that point at it, so unused labels can be deleted. */
383 #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
385 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
386 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
387 be decremented and possibly the label can be deleted. */
388 #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx)
390 /* Once basic blocks are found in flow.c,
391 each CODE_LABEL starts a chain that goes through
392 all the LABEL_REFs that jump to that label.
393 The chain eventually winds up at the CODE_LABEL; it is circular. */
394 #define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx)
396 /* This is the field in the LABEL_REF through which the circular chain
397 of references to a particular label is linked.
398 This chain is set up in flow.c. */
400 #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
402 /* Once basic blocks are found in flow.c,
403 Each LABEL_REF points to its containing instruction with this field. */
405 #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
407 /* For a REG rtx, REGNO extracts the register number. */
409 #define REGNO(RTX) ((RTX)->fld[0].rtint)
411 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
412 is the current function's return value. */
414 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
416 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
417 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
419 /* For a CONST_INT rtx, INTVAL extracts the integer. */
421 #define INTVAL(RTX) ((RTX)->fld[0].rtwint)
423 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
424 SUBREG_WORD extracts the word-number. */
426 #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
427 #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
429 /* Access various components of an ASM_OPERANDS rtx. */
431 #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
432 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
433 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
434 #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
435 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
436 #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
437 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
438 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
439 #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
440 #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
441 #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
443 /* For a MEM rtx, 1 if it's a volatile reference.
444 Also in an ASM_OPERANDS rtx. */
445 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
447 /* For a MEM rtx, 1 if it refers to a structure or union component. */
448 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
450 /* For a LABEL_REF, 1 means that this reference is to a label outside the
451 loop containing the reference. */
452 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
454 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
455 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
457 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
458 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
460 /* For a REG, 1 means the register is used only in an exit test of a loop. */
461 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
463 /* During sched, for an insn, 1 means that the insn must be scheduled together
464 with the preceding insn. */
465 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
467 /* For a SET rtx, SET_DEST is the place that is set
468 and SET_SRC is the value it is set to. */
469 #define SET_DEST(RTX) ((RTX)->fld[0].rtx)
470 #define SET_SRC(RTX) ((RTX)->fld[1].rtx)
472 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
473 #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
475 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
476 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
478 /* Flag in a SYMBOL_REF for machine-specific purposes. */
479 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
481 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
482 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
484 /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
485 of the function that is not involved in copying parameters to
486 pseudo-registers. FIRST_PARM_INSN is the very first insn of
487 the function, including the parameter copying.
488 We keep this around in case we must splice
489 this function into the assembly code at the end of the file.
490 FIRST_LABELNO is the first label number used by the function (inclusive).
491 LAST_LABELNO is the last label used by the function (exclusive).
492 MAX_REGNUM is the largest pseudo-register used by that function.
493 FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
494 POPS_ARGS is the number of bytes of input arguments popped by the function
495 STACK_SLOT_LIST is the list of stack slots.
496 FUNCTION_FLAGS are where single-bit flags are saved.
497 OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
498 ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
499 for the function arguments.
500 ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
503 We want this to lay down like an INSN. The PREV_INSN field
504 is always NULL. The NEXT_INSN field always points to the
505 first function insn of the function being squirreled away. */
507 #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
508 #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
509 #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
510 #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
511 #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
512 #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
513 #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
514 #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
515 #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
516 #define FUNCTION_FLAGS(RTX) ((RTX)->fld[11].rtint)
517 #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[12].rtint)
518 #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[13].rtvec)
519 #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[14].rtx)
521 /* In FUNCTION_FLAGS we save some variables computed when emitting the code
522 for the function and which must be `or'ed into the current flag values when
523 insns from that function are being inlined. */
525 /* These ought to be an enum, but non-ANSI compilers don't like that. */
526 #define FUNCTION_FLAGS_CALLS_ALLOCA 01
527 #define FUNCTION_FLAGS_CALLS_SETJMP 02
528 #define FUNCTION_FLAGS_RETURNS_STRUCT 04
529 #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
530 #define FUNCTION_FLAGS_NEEDS_CONTEXT 020
531 #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
532 #define FUNCTION_FLAGS_RETURNS_POINTER 0100
533 #define FUNCTION_FLAGS_USES_CONST_POOL 0200
534 #define FUNCTION_FLAGS_CALLS_LONGJMP 0400
535 #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000
537 /* Define a macro to look for REG_INC notes,
538 but save time on machines where they never exist. */
540 /* Don't continue this line--convex cc version 4.1 would lose. */
541 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
542 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
544 #define FIND_REG_INC_NOTE(insn, reg) 0
547 /* Indicate whether the machine has any sort of auto increment addressing.
548 If not, we can avoid checking for REG_INC notes. */
550 /* Don't continue this line--convex cc version 4.1 would lose. */
551 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
555 /* Generally useful functions. */
557 /* The following functions accept a wide integer argument. Rather than
558 having to cast on every function call, we use a macro instead, that is
559 defined here and in tree.h. */
562 #define exact_log2(N) exact_log2_wide ((HOST_WIDE_INT) (N))
563 #define floor_log2(N) floor_log2_wide ((HOST_WIDE_INT) (N))
566 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
568 #define plus_constant_for_output(X,C) \
569 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
571 extern rtx plus_constant_wide (), plus_constant_for_output_wide ();
573 #define GEN_INT(N) gen_rtx (CONST_INT, VOIDmode, (N))
575 extern rtx gen_rtx ();
577 extern char *xmalloc ();
578 extern char *xrealloc ();
579 extern char *oballoc ();
580 extern char *permalloc ();
582 extern rtx rtx_alloc ();
583 extern rtvec rtvec_alloc ();
584 extern rtx find_reg_note ();
585 extern rtx find_regno_note ();
586 extern HOST_WIDE_INT get_integer_term ();
587 extern rtx get_related_value ();
588 extern rtx single_set ();
589 extern rtx find_last_value ();
590 extern rtx copy_rtx ();
591 extern rtx copy_rtx_if_shared ();
592 extern rtx copy_most_rtx ();
593 extern rtx replace_rtx ();
594 extern rtvec gen_rtvec ();
595 extern rtvec gen_rtvec_v ();
596 extern rtx read_rtx ();
597 extern rtx gen_reg_rtx ();
598 extern rtx gen_label_rtx ();
599 extern rtx gen_inline_header_rtx ();
600 extern rtx gen_lowpart_common ();
601 extern rtx gen_lowpart ();
602 extern rtx gen_lowpart_if_possible ();
603 extern rtx operand_subword ();
604 extern rtx operand_subword_force ();
605 extern int subreg_lowpart_p ();
606 extern rtx make_safe_from ();
607 extern rtx memory_address ();
608 extern rtx get_insns ();
609 extern rtx get_last_insn ();
610 extern rtx get_last_insn_anywhere ();
611 extern void start_sequence ();
612 extern void push_to_sequence ();
613 extern void end_sequence ();
614 extern rtx gen_sequence ();
615 extern rtx expand_expr ();
616 extern rtx output_constant_def ();
617 extern rtx immed_real_const ();
618 extern rtx immed_real_const_1 ();
619 extern rtx immed_double_const ();
620 extern rtx force_const_mem ();
621 extern rtx get_pool_constant ();
622 extern enum machine_mode get_pool_mode ();
623 extern int get_pool_offset ();
624 extern rtx get_parm_real_loc ();
625 extern rtx assign_stack_local ();
626 extern rtx assign_stack_temp ();
627 extern rtx protect_from_queue ();
628 extern void emit_queue ();
629 extern rtx emit_move_insn ();
630 extern rtx emit_insn_before ();
631 extern rtx emit_jump_insn_before ();
632 extern rtx emit_call_insn_before ();
633 extern rtx emit_barrier_before ();
634 extern rtx emit_note_before ();
635 extern rtx emit_insn_after ();
636 extern rtx emit_jump_insn_after ();
637 extern rtx emit_barrier_after ();
638 extern rtx emit_label_after ();
639 extern rtx emit_note_after ();
640 extern rtx emit_line_note_after ();
641 extern rtx emit_insn ();
642 extern rtx emit_insns ();
643 extern rtx emit_insns_before ();
644 extern rtx emit_jump_insn ();
645 extern rtx emit_call_insn ();
646 extern rtx emit_label ();
647 extern rtx emit_barrier ();
648 extern rtx emit_line_note ();
649 extern rtx emit_note ();
650 extern rtx emit_line_note_force ();
651 extern rtx make_insn_raw ();
652 extern rtx previous_insn ();
653 extern rtx next_insn ();
654 extern rtx prev_nonnote_insn ();
655 extern rtx next_nonnote_insn ();
656 extern rtx prev_real_insn ();
657 extern rtx next_real_insn ();
658 extern rtx prev_active_insn ();
659 extern rtx next_active_insn ();
660 extern rtx prev_label ();
661 extern rtx next_label ();
662 extern rtx next_cc0_user ();
663 extern rtx prev_cc0_setter ();
664 extern rtx reg_set_last ();
665 extern rtx next_nondeleted_insn ();
666 extern enum rtx_code reverse_condition ();
667 extern enum rtx_code swap_condition ();
668 extern enum rtx_code unsigned_condition ();
669 extern enum rtx_code signed_condition ();
670 extern rtx find_equiv_reg ();
671 extern rtx squeeze_notes ();
672 extern rtx delete_insn ();
673 extern void delete_jump ();
674 extern rtx get_label_before ();
675 extern rtx get_label_after ();
676 extern rtx follow_jumps ();
677 extern rtx adj_offsettable_operand ();
678 extern rtx try_split ();
679 extern rtx split_insns ();
680 extern rtx simplify_unary_operation (), simplify_binary_operation ();
681 extern rtx simplify_ternary_operation (), simplify_relational_operation ();
682 extern rtx nonlocal_label_rtx_list ();
684 /* Maximum number of parallel sets and clobbers in any insn in this fn.
685 Always at least 3, since the combiner could put that many togetherm
686 and we want this to remain correct for all the remaining passes. */
688 extern int max_parallel;
690 extern int asm_noperands ();
691 extern char *decode_asm_operands ();
694 /* Conditional is to detect when config.h has been included. */
695 extern enum reg_class reg_preferred_class ();
696 extern enum reg_class reg_alternate_class ();
699 extern rtx get_first_nonparm_insn ();
701 /* Standard pieces of rtx, to be substituted directly into things. */
704 extern rtx const0_rtx;
705 extern rtx const1_rtx;
706 extern rtx const2_rtx;
707 extern rtx constm1_rtx;
708 extern rtx const_true_rtx;
710 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
712 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
715 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
717 /* Likewise, for the constants 1 and 2. */
719 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
720 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
722 /* All references to certain hard regs, except those created
723 by allocating pseudo regs into them (when that's possible),
724 go through these unique rtx objects. */
725 extern rtx stack_pointer_rtx;
726 extern rtx frame_pointer_rtx;
727 extern rtx arg_pointer_rtx;
728 extern rtx pic_offset_table_rtx;
729 extern rtx struct_value_rtx;
730 extern rtx struct_value_incoming_rtx;
731 extern rtx static_chain_rtx;
732 extern rtx static_chain_incoming_rtx;
734 /* Virtual registers are used during RTL generation to refer to locations into
735 the stack frame when the actual location isn't known until RTL generation
736 is complete. The routine instantiate_virtual_regs replaces these with
737 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
740 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
742 /* This points to the first word of the incoming arguments passed on the stack,
743 either by the caller or by the callee when pretending it was passed by the
746 extern rtx virtual_incoming_args_rtx;
748 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
750 /* If FRAME_GROWS_DOWNWARDS, this points to immediately above the first
751 variable on the stack. Otherwise, it points to the first variable on
754 extern rtx virtual_stack_vars_rtx;
756 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
758 /* This points to the location of dynamically-allocated memory on the stack
759 immediately after the stack pointer has been adjusted by the amount
762 extern rtx virtual_stack_dynamic_rtx;
764 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
766 /* This points to the location in the stack at which outgoing arguments should
767 be written when the stack is pre-pushed (arguments pushed using push
768 insns always use sp). */
770 extern rtx virtual_outgoing_args_rtx;
772 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
774 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 3)
776 extern rtx find_next_ref ();
777 extern rtx *find_single_use ();
779 /* Define a default value for STORE_FLAG_VALUE. */
781 #ifndef STORE_FLAG_VALUE
782 #define STORE_FLAG_VALUE 1
785 /* Nonzero after end of reload pass.
786 Set to 1 or 0 by toplev.c. */
788 extern int reload_completed;
790 /* Set to 1 while reload_as_needed is operating.
791 Required by some machines to handle any generated moves differently. */
793 extern int reload_in_progress;
795 /* If this is nonzero, we do not bother generating VOLATILE
796 around volatile memory references, and we are willing to
797 output indirect addresses. If cse is to follow, we reject
798 indirect addresses so a useful potential cse is generated;
799 if it is used only once, instruction combination will produce
800 the same indirect address eventually. */
801 extern int cse_not_expected;
803 /* Indexed by pseudo register number, gives the rtx for that pseudo.
804 Allocated in parallel with regno_pointer_flag. */
805 extern rtx *regno_reg_rtx;