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
72 unsigned int code : 16;
77 /* The kind of expression this is. */
78 enum rtx_code code : 16;
80 /* The kind of value the expression has. */
81 #ifdef ONLY_INT_FIELDS
84 enum machine_mode mode : 8;
86 /* 1 in an INSN if it can alter flow of control
87 within this function. Not yet used! */
88 unsigned int jump : 1;
89 /* 1 in an INSN if it can call another function. Not yet used! */
90 unsigned int call : 1;
91 /* 1 in a MEM or REG if value of this expression will never change
92 during the current function, even though it is not
94 1 in a SUBREG if it is from a promoted variable that is unsigned.
95 1 in a SYMBOL_REF if it addresses something in the per-function
97 1 in a CALL_INSN if it is a const call.
98 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
99 reorg until end of compilation; cleared before used. */
100 unsigned int unchanging : 1;
101 /* 1 in a MEM expression if contents of memory are volatile.
102 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
104 1 in a REG expression if corresponds to a variable declared by the user.
105 0 for an internally generated temporary.
106 In a SYMBOL_REF, this flag is used for machine-specific purposes.
107 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
108 unsigned int volatil : 1;
109 /* 1 in a MEM referring to a field of a structure (not a union!).
110 0 if the MEM was a variable or the result of a * operator in C;
111 1 if it was the result of a . or -> operator (on a struct) in C.
112 1 in a REG if the register is used only in exit code a loop.
113 1 in a SUBREG expression if was generated from a variable with a
115 1 in a CODE_LABEL if the label is used for nonlocal gotos
116 and must not be deleted even if its count is zero.
117 1 in a LABEL_REF if this is a reference to a label outside the
119 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
120 together with the preceding insn. Valid only within sched.
121 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
122 from the target of a branch. Valid from reorg until end of compilation;
123 cleared before used. */
124 unsigned int in_struct : 1;
125 /* 1 if this rtx is used. This is used for copying shared structure.
126 See `unshare_all_rtl'.
127 In a REG, this is not needed for that purpose, and used instead
128 in `leaf_renumber_regs_insn'.
129 In a SYMBOL_REF, means that emit_library_call
130 has used it as the function. */
131 unsigned int used : 1;
132 /* Nonzero if this rtx came from procedure integration.
133 In a REG, nonzero means this reg refers to the return value
134 of the current function. */
135 unsigned integrated : 1;
136 /* The first element of the operands of this rtx.
137 The number of operands and their types are controlled
138 by the `code' field, according to rtl.def. */
142 /* Add prototype support. */
144 #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
145 #define PROTO(ARGS) ARGS
147 #define PROTO(ARGS) ()
151 #define NULL_RTX (rtx) 0
153 /* Define a generic NULL if one hasn't already been defined. */
160 #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
161 #define GENERIC_PTR void *
163 #define GENERIC_PTR char *
168 #define NULL_PTR ((GENERIC_PTR)0)
171 /* Define macros to access the `code' field of the rtx. */
173 #ifdef SHORT_ENUM_BUG
174 #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code))
175 #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE)))
177 #define GET_CODE(RTX) ((RTX)->code)
178 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
181 #define GET_MODE(RTX) ((RTX)->mode)
182 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
184 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
185 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
187 /* RTL vector. These appear inside RTX's when there is a need
188 for a variable number of things. The principle use is inside
189 PARALLEL expressions. */
191 typedef struct rtvec_def{
192 unsigned num_elem; /* number of elements */
196 #define NULL_RTVEC (rtvec) 0
198 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
199 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (unsigned) NUM)
201 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx)
203 /* 1 if X is a REG. */
205 #define REG_P(X) (GET_CODE (X) == REG)
207 /* 1 if X is a constant value that is an integer. */
209 #define CONSTANT_P(X) \
210 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
211 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
212 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH)
214 /* General accessor macros for accessing the fields of an rtx. */
216 #define XEXP(RTX, N) ((RTX)->fld[N].rtx)
217 #define XINT(RTX, N) ((RTX)->fld[N].rtint)
218 #define XWINT(RTX, N) ((RTX)->fld[N].rtwint)
219 #define XSTR(RTX, N) ((RTX)->fld[N].rtstr)
220 #define XVEC(RTX, N) ((RTX)->fld[N].rtvec)
221 #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
222 #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
224 /* ACCESS MACROS for particular fields of insns. */
226 /* Holds a unique number for each insn.
227 These are not necessarily sequentially increasing. */
228 #define INSN_UID(INSN) ((INSN)->fld[0].rtint)
230 /* Chain insns together in sequence. */
231 #define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
232 #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
234 /* The body of an insn. */
235 #define PATTERN(INSN) ((INSN)->fld[3].rtx)
237 /* Code number of instruction, from when it was recognized.
238 -1 means this instruction has not been recognized yet. */
239 #define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
241 /* Set up in flow.c; empty before then.
242 Holds a chain of INSN_LIST rtx's whose first operands point at
243 previous insns with direct data-flow connections to this one.
244 That means that those insns set variables whose next use is in this insn.
245 They are always in the same basic block as this insn. */
246 #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx)
248 /* 1 if insn has been deleted. */
249 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
251 /* 1 if insn is a call to a const function. */
252 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
254 /* 1 if insn is a branch that should not unconditionally execute its
255 delay slots, i.e., it is an annulled branch. */
256 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
258 /* 1 if insn is in a delay slot and is from the target of the branch. If
259 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
260 executed if the branch is taken. For annulled branches with this bit
261 clear, the insn should be executed only if the branch is not taken. */
262 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
264 /* Holds a list of notes on what this insn does to various REGs.
265 It is a chain of EXPR_LIST rtx's, where the second operand
266 is the chain pointer and the first operand is the REG being described.
267 The mode field of the EXPR_LIST contains not a real machine mode
268 but a value that says what this note says about the REG:
269 REG_DEAD means that the value in REG dies in this insn (i.e., it is
270 not needed past this insn). If REG is set in this insn, the REG_DEAD
271 note may, but need not, be omitted.
272 REG_INC means that the REG is autoincremented or autodecremented.
273 REG_EQUIV describes the insn as a whole; it says that the
274 insn sets a register to a constant value or to be equivalent to
275 a memory address. If the
276 register is spilled to the stack then the constant value
277 should be substituted for it. The contents of the REG_EQUIV
278 is the constant value or memory address, which may be different
279 from the source of the SET although it has the same value.
280 REG_EQUAL is like REG_EQUIV except that the destination
281 is only momentarily equal to the specified rtx. Therefore, it
282 cannot be used for substitution; but it can be used for cse.
283 REG_RETVAL means that this insn copies the return-value of
284 a library call out of the hard reg for return values. This note
285 is actually an INSN_LIST and it points to the first insn involved
286 in setting up arguments for the call. flow.c uses this to delete
287 the entire library call when its result is dead.
288 REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn
289 of the library call and points at the one that has the REG_RETVAL.
290 REG_WAS_0 says that the register set in this insn held 0 before the insn.
291 The contents of the note is the insn that stored the 0.
292 If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative.
293 The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST.
294 REG_NONNEG means that the register is always nonnegative during
295 the containing loop. This is used in branches so that decrement and
296 branch instructions terminating on zero can be matched. There must be
297 an insn pattern in the md file named `decrement_and_branch_until_zero'
298 or else this will never be added to any instructions.
299 REG_NO_CONFLICT means there is no conflict *after this insn*
300 between the register in the note and the destination of this insn.
301 REG_UNUSED identifies a register set in this insn and never used.
302 REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
303 CC0, respectively. Normally, these are required to be consecutive insns,
304 but we permit putting a cc0-setting insn in the delay slot of a branch
305 as long as only one copy of the insn exists. In that case, these notes
306 point from one to the other to allow code generation to determine what
307 any require information and to properly update CC_STATUS.
308 REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to
309 say that the CODE_LABEL contained in the REG_LABEL note is used
311 REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
312 dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output
313 (write after write) dependencies. Data dependencies, which are the only
314 type of LOG_LINK created by flow, are represented by a 0 reg note kind. */
316 #define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
318 /* Don't forget to change reg_note_name in rtl.c. */
319 enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
320 REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7,
321 REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
322 REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
323 REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15 };
325 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
326 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
327 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
329 /* Names for REG_NOTE's in EXPR_LIST insn's. */
331 extern char *reg_note_name[];
332 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int)(MODE)])
334 /* The label-number of a code-label. The assembler label
335 is made from `L' and the label-number printed in decimal.
336 Label numbers are unique in a compilation. */
337 #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint)
339 #define LINE_NUMBER NOTE
341 /* In a NOTE that is a line number, this is a string for the file name
342 that the line is in. We use the same field to record block numbers
343 temporarily in NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.
344 (We avoid lots of casts between ints and pointers if we use a
345 different macro for the bock number.) */
347 #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr)
348 #define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint)
350 /* In a NOTE that is a line number, this is the line number.
351 Other kinds of NOTEs are identified by negative numbers here. */
352 #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)
354 /* Codes that appear in the NOTE_LINE_NUMBER field
355 for kinds of notes that are not line numbers. */
357 /* This note indicates the end of the real body of the function,
358 after moving the parms into their homes, etc. */
359 #define NOTE_INSN_FUNCTION_BEG 0
361 /* This note is used to get rid of an insn
362 when it isn't safe to patch the insn out of the chain. */
363 #define NOTE_INSN_DELETED -1
364 #define NOTE_INSN_BLOCK_BEG -2
365 #define NOTE_INSN_BLOCK_END -3
366 #define NOTE_INSN_LOOP_BEG -4
367 #define NOTE_INSN_LOOP_END -5
368 /* This kind of note is generated at the end of the function body,
369 just before the return insn or return label.
370 In an optimizing compilation it is deleted by the first jump optimization,
371 after enabling that optimizer to determine whether control can fall
372 off the end of the function body without a return statement. */
373 #define NOTE_INSN_FUNCTION_END -6
374 /* This kind of note is generated just after each call to `setjmp', et al. */
375 #define NOTE_INSN_SETJMP -7
376 /* Generated at the place in a loop that `continue' jumps to. */
377 #define NOTE_INSN_LOOP_CONT -8
378 /* Generated at the start of a duplicated exit test. */
379 #define NOTE_INSN_LOOP_VTOP -9
380 /* This marks the point immediately after the last prologue insn. */
381 #define NOTE_INSN_PROLOGUE_END -10
382 /* This marks the point immediately prior to the first epilogue insn. */
383 #define NOTE_INSN_EPILOGUE_BEG -11
384 /* Generated in place of user-declared labels when they are deleted. */
385 #define NOTE_INSN_DELETED_LABEL -12
386 /* Don't forget to change note_insn_name in rtl.c. */
389 #if 0 /* These are not used, and I don't know what they were for. --rms. */
390 #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
391 #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
392 #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
393 #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
394 #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
397 /* Names for NOTE insn's other than line numbers. */
399 extern char *note_insn_name[];
400 #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
402 /* The name of a label, in case it corresponds to an explicit label
403 in the input source code. */
404 #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
406 /* In jump.c, each label contains a count of the number
407 of LABEL_REFs that point at it, so unused labels can be deleted. */
408 #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
410 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
411 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
412 be decremented and possibly the label can be deleted. */
413 #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx)
415 /* Once basic blocks are found in flow.c,
416 each CODE_LABEL starts a chain that goes through
417 all the LABEL_REFs that jump to that label.
418 The chain eventually winds up at the CODE_LABEL; it is circular. */
419 #define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx)
421 /* This is the field in the LABEL_REF through which the circular chain
422 of references to a particular label is linked.
423 This chain is set up in flow.c. */
425 #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
427 /* Once basic blocks are found in flow.c,
428 Each LABEL_REF points to its containing instruction with this field. */
430 #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
432 /* For a REG rtx, REGNO extracts the register number. */
434 #define REGNO(RTX) ((RTX)->fld[0].rtint)
436 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
437 is the current function's return value. */
439 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
441 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
442 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
444 /* For a CONST_INT rtx, INTVAL extracts the integer. */
446 #define INTVAL(RTX) ((RTX)->fld[0].rtwint)
448 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
449 SUBREG_WORD extracts the word-number. */
451 #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
452 #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
454 /* 1 if the REG contained in SUBREG_REG is already known to be
455 sign- or zero-extended from the mode of the SUBREG to the mode of
456 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
459 When used as a LHS, is means that this extension must be done
460 when assigning to SUBREG_REG. */
462 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
463 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
465 /* Access various components of an ASM_OPERANDS rtx. */
467 #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
468 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
469 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
470 #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
471 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
472 #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
473 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
474 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
475 #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
476 #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
477 #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
479 /* For a MEM rtx, 1 if it's a volatile reference.
480 Also in an ASM_OPERANDS rtx. */
481 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
483 /* For a MEM rtx, 1 if it refers to a structure or union component. */
484 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
486 /* For a LABEL_REF, 1 means that this reference is to a label outside the
487 loop containing the reference. */
488 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
490 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
491 /* Likewise in an EXPR_LIST for a REG_LABEL note. */
492 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
494 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
495 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
497 /* For a REG, 1 means the register is used only in an exit test of a loop. */
498 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
500 /* During sched, for an insn, 1 means that the insn must be scheduled together
501 with the preceding insn. */
502 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
504 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
505 cost of the dependence link. The cost of executing an instruction
506 may vary based on how the results are used. LINK_COST_ZERO is 1 when
507 the cost through the link varies and is unchanged (i.e., the link has
508 zero additional cost). LINK_COST_FREE is 1 when the cost through the
509 link is zero (i.e., the link makes the cost free). In other cases,
510 the adjustment to the cost is recomputed each time it is needed. */
511 #define LINK_COST_ZERO(X) ((X)->jump)
512 #define LINK_COST_FREE(X) ((X)->call)
514 /* For a SET rtx, SET_DEST is the place that is set
515 and SET_SRC is the value it is set to. */
516 #define SET_DEST(RTX) ((RTX)->fld[0].rtx)
517 #define SET_SRC(RTX) ((RTX)->fld[1].rtx)
519 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
520 #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
522 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
523 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
525 /* Flag in a SYMBOL_REF for machine-specific purposes. */
526 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
528 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
529 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
531 /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
532 of the function that is not involved in copying parameters to
533 pseudo-registers. FIRST_PARM_INSN is the very first insn of
534 the function, including the parameter copying.
535 We keep this around in case we must splice
536 this function into the assembly code at the end of the file.
537 FIRST_LABELNO is the first label number used by the function (inclusive).
538 LAST_LABELNO is the last label used by the function (exclusive).
539 MAX_REGNUM is the largest pseudo-register used by that function.
540 FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
541 POPS_ARGS is the number of bytes of input arguments popped by the function
542 STACK_SLOT_LIST is the list of stack slots.
543 FUNCTION_FLAGS are where single-bit flags are saved.
544 OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
545 ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
546 for the function arguments.
547 ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
550 We want this to lay down like an INSN. The PREV_INSN field
551 is always NULL. The NEXT_INSN field always points to the
552 first function insn of the function being squirreled away. */
554 #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
555 #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
556 #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
557 #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
558 #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
559 #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
560 #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
561 #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
562 #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
563 #define FUNCTION_FLAGS(RTX) ((RTX)->fld[11].rtint)
564 #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[12].rtint)
565 #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[13].rtvec)
566 #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[14].rtx)
568 /* In FUNCTION_FLAGS we save some variables computed when emitting the code
569 for the function and which must be `or'ed into the current flag values when
570 insns from that function are being inlined. */
572 /* These ought to be an enum, but non-ANSI compilers don't like that. */
573 #define FUNCTION_FLAGS_CALLS_ALLOCA 01
574 #define FUNCTION_FLAGS_CALLS_SETJMP 02
575 #define FUNCTION_FLAGS_RETURNS_STRUCT 04
576 #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
577 #define FUNCTION_FLAGS_NEEDS_CONTEXT 020
578 #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
579 #define FUNCTION_FLAGS_RETURNS_POINTER 0100
580 #define FUNCTION_FLAGS_USES_CONST_POOL 0200
581 #define FUNCTION_FLAGS_CALLS_LONGJMP 0400
582 #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000
584 /* Define a macro to look for REG_INC notes,
585 but save time on machines where they never exist. */
587 /* Don't continue this line--convex cc version 4.1 would lose. */
588 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
589 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
591 #define FIND_REG_INC_NOTE(insn, reg) 0
594 /* Indicate whether the machine has any sort of auto increment addressing.
595 If not, we can avoid checking for REG_INC notes. */
597 /* Don't continue this line--convex cc version 4.1 would lose. */
598 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
602 /* Generally useful functions. */
604 /* The following functions accept a wide integer argument. Rather than
605 having to cast on every function call, we use a macro instead, that is
606 defined here and in tree.h. */
609 #define exact_log2(N) exact_log2_wide ((HOST_WIDE_INT) (N))
610 #define floor_log2(N) floor_log2_wide ((HOST_WIDE_INT) (N))
613 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
615 #define plus_constant_for_output(X,C) \
616 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
618 extern rtx plus_constant_wide PROTO((rtx, HOST_WIDE_INT));
619 extern rtx plus_constant_for_output_wide PROTO((rtx, HOST_WIDE_INT));
621 #define GEN_INT(N) gen_rtx (CONST_INT, VOIDmode, (N))
624 /* We cannot define prototypes for the variable argument functions,
625 since they have not been ANSI-fied, and an ANSI compiler would
626 complain when compiling the definition of these functions. */
628 extern rtx gen_rtx PROTO((enum rtx_code, enum machine_mode, ...));
629 extern rtvec gen_rtvec PROTO((int, ...));
632 extern rtx gen_rtx ();
633 extern rtvec gen_rtvec ();
636 #ifdef BUFSIZ /* stdio.h has been included */
637 extern rtx read_rtx PROTO((FILE *));
639 extern rtx read_rtx ();
643 /* At present, don't prototype xrealloc, since all of the callers don't
644 cast their pointers to char *, and all of the xrealloc's don't use
646 extern char *xrealloc PROTO((void *, unsigned));
648 extern char *xrealloc ();
651 extern char *xmalloc PROTO((unsigned));
652 extern char *oballoc PROTO((int));
653 extern char *permalloc PROTO((int));
654 extern void free PROTO((void *));
655 extern rtx rtx_alloc PROTO((RTX_CODE));
656 extern rtvec rtvec_alloc PROTO((int));
657 extern rtx find_reg_note PROTO((rtx, enum reg_note, rtx));
658 extern rtx find_regno_note PROTO((rtx, enum reg_note, int));
659 extern HOST_WIDE_INT get_integer_term PROTO((rtx));
660 extern rtx get_related_value PROTO((rtx));
661 extern rtx single_set PROTO((rtx));
662 extern rtx find_last_value PROTO((rtx, rtx *, rtx));
663 extern rtx copy_rtx PROTO((rtx));
664 extern rtx copy_rtx_if_shared PROTO((rtx));
665 extern rtx copy_most_rtx PROTO((rtx, rtx));
666 extern rtx replace_rtx PROTO((rtx, rtx, rtx));
667 extern rtvec gen_rtvec_v PROTO((int, rtx *));
668 extern rtx gen_reg_rtx PROTO((enum machine_mode));
669 extern rtx gen_label_rtx PROTO((void));
670 extern rtx gen_inline_header_rtx PROTO((rtx, rtx, int, int, int, int, int, int, rtx, int, int, rtvec, rtx));
671 extern rtx gen_lowpart_common PROTO((enum machine_mode, rtx));
672 extern rtx gen_lowpart PROTO((enum machine_mode, rtx));
673 extern rtx gen_lowpart_if_possible PROTO((enum machine_mode, rtx));
674 extern rtx gen_highpart PROTO((enum machine_mode, rtx));
675 extern rtx gen_realpart PROTO((enum machine_mode, rtx));
676 extern rtx gen_imagpart PROTO((enum machine_mode, rtx));
677 extern rtx operand_subword PROTO((rtx, int, int, enum machine_mode));
678 extern rtx operand_subword_force PROTO((rtx, int, enum machine_mode));
679 extern int subreg_lowpart_p PROTO((rtx));
680 extern rtx make_safe_from PROTO((rtx, rtx));
681 extern rtx memory_address PROTO((enum machine_mode, rtx));
682 extern rtx get_insns PROTO((void));
683 extern rtx get_last_insn PROTO((void));
684 extern rtx get_last_insn_anywhere PROTO((void));
685 extern void start_sequence PROTO((void));
686 extern void push_to_sequence PROTO((rtx));
687 extern void end_sequence PROTO((void));
688 extern rtx gen_sequence PROTO((void));
689 extern rtx immed_double_const PROTO((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
690 extern rtx force_const_mem PROTO((enum machine_mode, rtx));
691 extern rtx force_reg PROTO((enum machine_mode, rtx));
692 extern rtx get_pool_constant PROTO((rtx));
693 extern enum machine_mode get_pool_mode PROTO((rtx));
694 extern int get_pool_offset PROTO((rtx));
695 extern rtx simplify_subtraction PROTO((rtx));
696 extern rtx assign_stack_local PROTO((enum machine_mode, int, int));
697 extern rtx assign_stack_temp PROTO((enum machine_mode, int, int));
698 extern rtx protect_from_queue PROTO((rtx, int));
699 extern void emit_queue PROTO((void));
700 extern rtx emit_move_insn PROTO((rtx, rtx));
701 extern rtx emit_insn_before PROTO((rtx, rtx));
702 extern rtx emit_jump_insn_before PROTO((rtx, rtx));
703 extern rtx emit_call_insn_before PROTO((rtx, rtx));
704 extern rtx emit_barrier_before PROTO((rtx));
705 extern rtx emit_note_before PROTO((int, rtx));
706 extern rtx emit_insn_after PROTO((rtx, rtx));
707 extern rtx emit_jump_insn_after PROTO((rtx, rtx));
708 extern rtx emit_barrier_after PROTO((rtx));
709 extern rtx emit_label_after PROTO((rtx, rtx));
710 extern rtx emit_note_after PROTO((int, rtx));
711 extern rtx emit_line_note_after PROTO((char *, int, rtx));
712 extern rtx emit_insn PROTO((rtx));
713 extern rtx emit_insns PROTO((rtx));
714 extern rtx emit_insns_before PROTO((rtx, rtx));
715 extern rtx emit_jump_insn PROTO((rtx));
716 extern rtx emit_call_insn PROTO((rtx));
717 extern rtx emit_label PROTO((rtx));
718 extern rtx emit_barrier PROTO((void));
719 extern rtx emit_line_note PROTO((char *, int));
720 extern rtx emit_note PROTO((char *, int));
721 extern rtx emit_line_note_force PROTO((char *, int));
722 extern rtx make_insn_raw PROTO((rtx));
723 extern rtx previous_insn PROTO((rtx));
724 extern rtx next_insn PROTO((rtx));
725 extern rtx prev_nonnote_insn PROTO((rtx));
726 extern rtx next_nonnote_insn PROTO((rtx));
727 extern rtx prev_real_insn PROTO((rtx));
728 extern rtx next_real_insn PROTO((rtx));
729 extern rtx prev_active_insn PROTO((rtx));
730 extern rtx next_active_insn PROTO((rtx));
731 extern rtx prev_label PROTO((rtx));
732 extern rtx next_label PROTO((rtx));
733 extern rtx next_cc0_user PROTO((rtx));
734 extern rtx prev_cc0_setter PROTO((rtx));
735 extern rtx reg_set_last PROTO((rtx, rtx));
736 extern rtx next_nondeleted_insn PROTO((rtx));
737 extern enum rtx_code reverse_condition PROTO((enum rtx_code));
738 extern enum rtx_code swap_condition PROTO((enum rtx_code));
739 extern enum rtx_code unsigned_condition PROTO((enum rtx_code));
740 extern enum rtx_code signed_condition PROTO((enum rtx_code));
741 extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode));
742 extern rtx squeeze_notes PROTO((rtx, rtx));
743 extern rtx delete_insn PROTO((rtx));
744 extern void delete_jump PROTO((rtx));
745 extern rtx get_label_before PROTO((rtx));
746 extern rtx get_label_after PROTO((rtx));
747 extern rtx follow_jumps PROTO((rtx));
748 extern rtx adj_offsettable_operand PROTO((rtx, int));
749 extern rtx try_split PROTO((rtx, rtx, int));
750 extern rtx split_insns PROTO((rtx, rtx));
751 extern rtx simplify_unary_operation PROTO((enum rtx_code, enum machine_mode, rtx, enum machine_mode));
752 extern rtx simplify_binary_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
753 extern rtx simplify_ternary_operation PROTO((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx));
754 extern rtx simplify_relational_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
755 extern rtx nonlocal_label_rtx_list PROTO((void));
756 extern rtx gen_move_insn PROTO((rtx, rtx));
757 extern rtx gen_jump PROTO((rtx));
758 extern rtx gen_beq PROTO((rtx));
759 extern rtx gen_bge PROTO((rtx));
760 extern rtx gen_ble PROTO((rtx));
761 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
762 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
764 /* Maximum number of parallel sets and clobbers in any insn in this fn.
765 Always at least 3, since the combiner could put that many togetherm
766 and we want this to remain correct for all the remaining passes. */
768 extern int max_parallel;
770 extern int asm_noperands PROTO((rtx));
771 extern char *decode_asm_operands PROTO((rtx, rtx *, rtx **, char **, enum machine_mode *));
773 extern enum reg_class reg_preferred_class PROTO((int));
774 extern enum reg_class reg_alternate_class PROTO((int));
776 extern rtx get_first_nonparm_insn PROTO((void));
778 /* Standard pieces of rtx, to be substituted directly into things. */
781 extern rtx const0_rtx;
782 extern rtx const1_rtx;
783 extern rtx const2_rtx;
784 extern rtx constm1_rtx;
785 extern rtx const_true_rtx;
787 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
789 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
792 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
794 /* Likewise, for the constants 1 and 2. */
796 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
797 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
799 /* All references to certain hard regs, except those created
800 by allocating pseudo regs into them (when that's possible),
801 go through these unique rtx objects. */
802 extern rtx stack_pointer_rtx;
803 extern rtx frame_pointer_rtx;
804 extern rtx arg_pointer_rtx;
805 extern rtx pic_offset_table_rtx;
806 extern rtx struct_value_rtx;
807 extern rtx struct_value_incoming_rtx;
808 extern rtx static_chain_rtx;
809 extern rtx static_chain_incoming_rtx;
811 /* Virtual registers are used during RTL generation to refer to locations into
812 the stack frame when the actual location isn't known until RTL generation
813 is complete. The routine instantiate_virtual_regs replaces these with
814 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
817 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
819 /* This points to the first word of the incoming arguments passed on the stack,
820 either by the caller or by the callee when pretending it was passed by the
823 extern rtx virtual_incoming_args_rtx;
825 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
827 /* If FRAME_GROWS_DOWNWARDS, this points to immediately above the first
828 variable on the stack. Otherwise, it points to the first variable on
831 extern rtx virtual_stack_vars_rtx;
833 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
835 /* This points to the location of dynamically-allocated memory on the stack
836 immediately after the stack pointer has been adjusted by the amount
839 extern rtx virtual_stack_dynamic_rtx;
841 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
843 /* This points to the location in the stack at which outgoing arguments should
844 be written when the stack is pre-pushed (arguments pushed using push
845 insns always use sp). */
847 extern rtx virtual_outgoing_args_rtx;
849 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
851 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 3)
853 extern rtx find_next_ref PROTO((rtx, rtx));
854 extern rtx *find_single_use PROTO((rtx, rtx, rtx *));
856 /* It is hard to write the prototype for expand_expr, since it needs
857 expr.h to be included for the enumeration. */
859 extern rtx expand_expr ();
860 extern rtx immed_real_const_1();
863 /* rtl.h and tree.h were included. */
864 extern rtx output_constant_def PROTO((tree));
865 extern rtx immed_real_const PROTO((tree));
866 extern rtx immed_real_const_1 PROTO((REAL_VALUE_TYPE, enum machine_mode));
867 extern tree make_tree PROTO((tree, rtx));
870 extern rtx output_constant_def ();
871 extern rtx immed_real_const ();
872 extern rtx immed_real_const_1 ();
875 /* Define a default value for STORE_FLAG_VALUE. */
877 #ifndef STORE_FLAG_VALUE
878 #define STORE_FLAG_VALUE 1
881 /* Nonzero after end of reload pass.
882 Set to 1 or 0 by toplev.c. */
884 extern int reload_completed;
886 /* Set to 1 while reload_as_needed is operating.
887 Required by some machines to handle any generated moves differently. */
889 extern int reload_in_progress;
891 /* If this is nonzero, we do not bother generating VOLATILE
892 around volatile memory references, and we are willing to
893 output indirect addresses. If cse is to follow, we reject
894 indirect addresses so a useful potential cse is generated;
895 if it is used only once, instruction combination will produce
896 the same indirect address eventually. */
897 extern int cse_not_expected;
899 /* Indexed by pseudo register number, gives the rtx for that pseudo.
900 Allocated in parallel with regno_pointer_flag. */
901 extern rtx *regno_reg_rtx;