1 /* Register Transfer Language (RTL) definitions for GNU C-Compiler
2 Copyright (C) 1987, 1991 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
61 struct rtvec_def *rtvec;
62 enum machine_mode rttype;
65 /* RTL expression ("rtx"). */
67 typedef struct rtx_def
69 #ifdef ONLY_INT_FIELDS
72 /* The kind of expression this is. */
73 enum rtx_code code : 16;
75 /* The kind of value the expression has. */
76 #ifdef ONLY_INT_FIELDS
79 enum machine_mode mode : 8;
81 /* 1 in an INSN if it can alter flow of control
82 within this function. Not yet used! */
83 unsigned int jump : 1;
84 /* 1 in an INSN if it can call another function. Not yet used! */
85 unsigned int call : 1;
86 /* 1 in a MEM or REG if value of this expression will never change
87 during the current function, even though it is not
89 1 in a SYMBOL_REF if it addresses something in the per-function
91 1 in a CALL_INSN if it is a const call.
92 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
93 reorg until end of compilation; cleared before used. */
94 unsigned int unchanging : 1;
95 /* 1 in a MEM expression if contents of memory are volatile.
96 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
98 1 in a REG expression if corresponds to a variable declared by the user.
99 0 for an internally generated temporary.
100 In a SYMBOL_REF, this flag is used for machine-specific purposes. */
101 unsigned int volatil : 1;
102 /* 1 in a MEM referring to a field of a structure (not a union!).
103 0 if the MEM was a variable or the result of a * operator in C;
104 1 if it was the result of a . or -> operator (on a struct) in C.
105 1 in a REG if the register is used only in exit code a loop.
106 1 in a CODE_LABEL if the label is used for nonlocal gotos
107 and must not be deleted even if its count is zero.
108 1 in a LABEL_REF if this is a reference to a label outside the
110 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
111 together with the preceding insn. Valid only within sched.
112 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
113 from the target of a branch. Valid from reorg until end of compilation;
114 cleared before used. */
115 unsigned int in_struct : 1;
116 /* 1 if this rtx is used. This is used for copying shared structure.
117 See `unshare_all_rtl'.
118 In a REG, this is not needed for that purpose, and used instead
119 in `leaf_renumber_regs_insn'.
120 In a SYMBOL_REF, means that emit_library_call
121 has used it as the function. */
122 unsigned int used : 1;
123 /* Nonzero if this rtx came from procedure integration.
124 In a REG, nonzero means this reg refers to the return value
125 of the current function. */
126 unsigned integrated : 1;
127 /* The first element of the operands of this rtx.
128 The number of operands and their types are controlled
129 by the `code' field, according to rtl.def. */
133 #define NULL_RTX (rtx) 0
135 /* Define macros to access the `code' field of the rtx. */
137 #ifdef SHORT_ENUM_BUG
138 #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code))
139 #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE)))
141 #define GET_CODE(RTX) ((RTX)->code)
142 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
145 #define GET_MODE(RTX) ((RTX)->mode)
146 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
148 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
149 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
151 /* RTL vector. These appear inside RTX's when there is a need
152 for a variable number of things. The principle use is inside
153 PARALLEL expressions. */
155 typedef struct rtvec_def{
156 unsigned num_elem; /* number of elements */
160 #define NULL_RTVEC (rtvec) 0
162 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
163 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (unsigned) NUM)
165 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx)
167 /* 1 if X is a REG. */
169 #define REG_P(X) (GET_CODE (X) == REG)
171 /* 1 if X is a constant value that is an integer. */
173 #define CONSTANT_P(X) \
174 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
175 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
176 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH)
178 /* General accessor macros for accessing the fields of an rtx. */
180 #define XEXP(RTX, N) ((RTX)->fld[N].rtx)
181 #define XINT(RTX, N) ((RTX)->fld[N].rtint)
182 #define XSTR(RTX, N) ((RTX)->fld[N].rtstr)
183 #define XVEC(RTX, N) ((RTX)->fld[N].rtvec)
184 #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
185 #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
187 /* ACCESS MACROS for particular fields of insns. */
189 /* Holds a unique number for each insn.
190 These are not necessarily sequentially increasing. */
191 #define INSN_UID(INSN) ((INSN)->fld[0].rtint)
193 /* Chain insns together in sequence. */
194 #define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
195 #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
197 /* The body of an insn. */
198 #define PATTERN(INSN) ((INSN)->fld[3].rtx)
200 /* Code number of instruction, from when it was recognized.
201 -1 means this instruction has not been recognized yet. */
202 #define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
204 /* Set up in flow.c; empty before then.
205 Holds a chain of INSN_LIST rtx's whose first operands point at
206 previous insns with direct data-flow connections to this one.
207 That means that those insns set variables whose next use is in this insn.
208 They are always in the same basic block as this insn. */
209 #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx)
211 /* 1 if insn has been deleted. */
212 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
214 /* 1 if insn is a call to a const function. */
215 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
217 /* 1 if insn is a branch that should not unconditionally execute its
218 delay slots, i.e., it is an annulled branch. */
219 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
221 /* 1 if insn is in a delay slot and is from the target of the branch. If
222 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
223 executed if the branch is taken. For annulled branches with this bit
224 clear, the insn should be executed only if the branch is not taken. */
225 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
227 /* Holds a list of notes on what this insn does to various REGs.
228 It is a chain of EXPR_LIST rtx's, where the second operand
229 is the chain pointer and the first operand is the REG being described.
230 The mode field of the EXPR_LIST contains not a real machine mode
231 but a value that says what this note says about the REG:
232 REG_DEAD means that the value in REG dies in this insn (i.e., it is
233 not needed past this insn). If REG is set in this insn, the REG_DEAD
234 note may, but need not, be omitted.
235 REG_INC means that the REG is autoincremented or autodecremented.
236 REG_EQUIV describes the insn as a whole; it says that the
237 insn sets a register to a constant value or to be equivalent to
238 a memory address. If the
239 register is spilled to the stack then the constant value
240 should be substituted for it. The contents of the REG_EQUIV
241 is the constant value or memory address, which may be different
242 from the source of the SET although it has the same value.
243 REG_EQUAL is like REG_EQUIV except that the destination
244 is only momentarily equal to the specified rtx. Therefore, it
245 cannot be used for substitution; but it can be used for cse.
246 REG_RETVAL means that this insn copies the return-value of
247 a library call out of the hard reg for return values. This note
248 is actually an INSN_LIST and it points to the first insn involved
249 in setting up arguments for the call. flow.c uses this to delete
250 the entire library call when its result is dead.
251 REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn
252 of the library call and points at the one that has the REG_RETVAL.
253 REG_WAS_0 says that the register set in this insn held 0 before the insn.
254 The contents of the note is the insn that stored the 0.
255 If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative.
256 The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST.
257 REG_NONNEG means that the register is always nonnegative during
258 the containing loop. This is used in branches so that decrement and
259 branch instructions terminating on zero can be matched. There must be
260 an insn pattern in the md file named `decrement_and_branch_until_zero'
261 or else this will never be added to any instructions.
262 REG_NO_CONFLICT means there is no conflict *after this insn*
263 between the register in the note and the destination of this insn.
264 REG_UNUSED identifies a register set in this insn and never used.
265 REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
266 CC0, respectively. Normally, these are required to be consecutive insns,
267 but we permit putting a cc0-setting insn in the delay slot of a branch
268 as long as only one copy of the insn exists. In that case, these notes
269 point from one to the other to allow code generation to determine what
270 any require information and to properly update CC_STATUS.
271 REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to
272 say that the CODE_LABEL contained in the REG_LABEL note is used
274 REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
275 dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output
276 (write after write) dependencies. Data dependencies, which are the only
277 type of LOG_LINK created by flow, are represented by a 0 reg note kind. */
279 #define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
281 /* Don't forget to change reg_note_name in rtl.c. */
282 enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
283 REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7,
284 REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
285 REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
286 REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15 };
288 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
289 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
290 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
292 /* Names for REG_NOTE's in EXPR_LIST insn's. */
294 extern char *reg_note_name[];
295 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int)(MODE)])
297 /* The label-number of a code-label. The assembler label
298 is made from `L' and the label-number printed in decimal.
299 Label numbers are unique in a compilation. */
300 #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint)
302 #define LINE_NUMBER NOTE
304 /* In a NOTE that is a line number, this is a string for the file name
305 that the line is in. */
307 #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr)
309 /* In a NOTE that is a line number, this is the line number.
310 Other kinds of NOTEs are identified by negative numbers here. */
311 #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)
313 /* Codes that appear in the NOTE_LINE_NUMBER field
314 for kinds of notes that are not line numbers. */
316 /* This note indicates the end of the real body of the function,
317 after moving the parms into their homes, etc. */
318 #define NOTE_INSN_FUNCTION_BEG 0
320 /* This note is used to get rid of an insn
321 when it isn't safe to patch the insn out of the chain. */
322 #define NOTE_INSN_DELETED -1
323 #define NOTE_INSN_BLOCK_BEG -2
324 #define NOTE_INSN_BLOCK_END -3
325 #define NOTE_INSN_LOOP_BEG -4
326 #define NOTE_INSN_LOOP_END -5
327 /* This kind of note is generated at the end of the function body,
328 just before the return insn or return label.
329 In an optimizing compilation it is deleted by the first jump optimization,
330 after enabling that optimizer to determine whether control can fall
331 off the end of the function body without a return statement. */
332 #define NOTE_INSN_FUNCTION_END -6
333 /* This kind of note is generated just after each call to `setjmp', et al. */
334 #define NOTE_INSN_SETJMP -7
335 /* Generated at the place in a loop that `continue' jumps to. */
336 #define NOTE_INSN_LOOP_CONT -8
337 /* Generated at the start of a duplicated exit test. */
338 #define NOTE_INSN_LOOP_VTOP -9
339 /* This marks the point immediately after the last prologue insn. */
340 #define NOTE_INSN_PROLOGUE_END -10
341 /* This marks the point immediately prior to the first epilogue insn. */
342 #define NOTE_INSN_EPILOGUE_BEG -11
343 /* Don't forget to change note_insn_name in rtl.c. */
345 #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
346 #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
347 #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
348 #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
349 #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
351 /* Names for NOTE insn's other than line numbers. */
353 extern char *note_insn_name[];
354 #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
356 /* The name of a label, in case it corresponds to an explicit label
357 in the input source code. */
358 #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
360 /* In jump.c, each label contains a count of the number
361 of LABEL_REFs that point at it, so unused labels can be deleted. */
362 #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
364 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
365 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
366 be decremented and possibly the label can be deleted. */
367 #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx)
369 /* Once basic blocks are found in flow.c,
370 each CODE_LABEL starts a chain that goes through
371 all the LABEL_REFs that jump to that label.
372 The chain eventually winds up at the CODE_LABEL; it is circular. */
373 #define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx)
375 /* This is the field in the LABEL_REF through which the circular chain
376 of references to a particular label is linked.
377 This chain is set up in flow.c. */
379 #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
381 /* Once basic blocks are found in flow.c,
382 Each LABEL_REF points to its containing instruction with this field. */
384 #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
386 /* For a REG rtx, REGNO extracts the register number. */
388 #define REGNO(RTX) ((RTX)->fld[0].rtint)
390 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
391 is the current function's return value. */
393 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
395 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
396 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
398 /* For a CONST_INT rtx, INTVAL extracts the integer. */
400 #define INTVAL(RTX) ((RTX)->fld[0].rtint)
402 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
403 SUBREG_WORD extracts the word-number. */
405 #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
406 #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
408 /* Access various components of an ASM_OPERANDS rtx. */
410 #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
411 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
412 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
413 #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
414 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
415 #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
416 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
417 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
418 #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
419 #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
420 #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
422 /* For a MEM rtx, 1 if it's a volatile reference.
423 Also in an ASM_OPERANDS rtx. */
424 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
426 /* For a MEM rtx, 1 if it refers to a structure or union component. */
427 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
429 /* For a LABEL_REF, 1 means that this reference is to a label outside the
430 loop containing the reference. */
431 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
433 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
434 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
436 /* For a REG, 1 means the register is used only in an exit test of a loop. */
437 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
439 /* During sched, for an insn, 1 means that the insn must be scheduled together
440 with the preceding insn. */
441 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
443 /* For a SET rtx, SET_DEST is the place that is set
444 and SET_SRC is the value it is set to. */
445 #define SET_DEST(RTX) ((RTX)->fld[0].rtx)
446 #define SET_SRC(RTX) ((RTX)->fld[1].rtx)
448 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
449 #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
451 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
452 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
454 /* Flag in a SYMBOL_REF for machine-specific purposes. */
455 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
457 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
458 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
460 /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
461 of the function that is not involved in copying parameters to
462 pseudo-registers. FIRST_PARM_INSN is the very first insn of
463 the function, including the parameter copying.
464 We keep this around in case we must splice
465 this function into the assembly code at the end of the file.
466 FIRST_LABELNO is the first label number used by the function (inclusive).
467 LAST_LABELNO is the last label used by the function (exclusive).
468 MAX_REGNUM is the largest pseudo-register used by that function.
469 FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
470 POPS_ARGS is the number of bytes of input arguments popped by the function
471 STACK_SLOT_LIST is the list of stack slots.
472 FUNCTION_FLAGS are where single-bit flags are saved.
473 OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
474 ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
475 for the function arguments.
476 ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
479 We want this to lay down like an INSN. The PREV_INSN field
480 is always NULL. The NEXT_INSN field always points to the
481 first function insn of the function being squirreled away. */
483 #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
484 #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
485 #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
486 #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
487 #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
488 #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
489 #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
490 #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
491 #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
492 #define FUNCTION_FLAGS(RTX) ((RTX)->fld[11].rtint)
493 #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[12].rtint)
494 #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[13].rtvec)
495 #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[14].rtx)
497 /* In FUNCTION_FLAGS we save some variables computed when emitting the code
498 for the function and which must be `or'ed into the current flag values when
499 insns from that function are being inlined. */
501 /* These ought to be an enum, but non-ANSI compilers don't like that. */
502 #define FUNCTION_FLAGS_CALLS_ALLOCA 01
503 #define FUNCTION_FLAGS_CALLS_SETJMP 02
504 #define FUNCTION_FLAGS_RETURNS_STRUCT 04
505 #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
506 #define FUNCTION_FLAGS_NEEDS_CONTEXT 020
507 #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
508 #define FUNCTION_FLAGS_RETURNS_POINTER 0100
509 #define FUNCTION_FLAGS_USES_CONST_POOL 0200
510 #define FUNCTION_FLAGS_CALLS_LONGJMP 0400
511 #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000
513 /* Define a macro to look for REG_INC notes,
514 but save time on machines where they never exist. */
516 /* Don't continue this line--convex cc version 4.1 would lose. */
517 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
518 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
520 #define FIND_REG_INC_NOTE(insn, reg) 0
523 /* Indicate whether the machine has any sort of auto increment addressing.
524 If not, we can avoid checking for REG_INC notes. */
526 /* Don't continue this line--convex cc version 4.1 would lose. */
527 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
531 /* Generally useful functions. */
533 extern char *xmalloc ();
535 extern rtx rtx_alloc ();
536 extern rtvec rtvec_alloc ();
537 extern rtx find_reg_note ();
538 extern rtx find_regno_note ();
539 extern int get_integer_term ();
540 extern rtx get_related_value ();
541 extern rtx single_set ();
542 extern rtx find_last_value ();
543 extern rtx gen_rtx ();
544 extern rtx copy_rtx ();
545 extern rtx copy_rtx_if_shared ();
546 extern rtx copy_most_rtx ();
547 extern rtx replace_rtx ();
548 extern rtvec gen_rtvec ();
549 extern rtvec gen_rtvec_v ();
550 extern rtx read_rtx ();
551 extern rtx gen_reg_rtx ();
552 extern rtx gen_label_rtx ();
553 extern rtx gen_inline_header_rtx ();
554 extern rtx gen_lowpart_common ();
555 extern rtx gen_lowpart ();
556 extern rtx gen_lowpart_if_possible ();
557 extern rtx operand_subword ();
558 extern rtx operand_subword_force ();
559 extern int subreg_lowpart_p ();
560 extern rtx make_safe_from ();
561 extern rtx memory_address ();
562 extern rtx get_insns ();
563 extern rtx get_last_insn ();
564 extern rtx get_last_insn_anywhere ();
565 extern void start_sequence ();
566 extern void push_to_sequence ();
567 extern void end_sequence ();
568 extern rtx gen_sequence ();
569 extern rtx expand_expr ();
570 extern rtx output_constant_def ();
571 extern rtx immed_real_const ();
572 extern rtx immed_real_const_1 ();
573 extern rtx immed_double_const ();
574 extern rtx force_const_mem ();
575 extern rtx get_pool_constant ();
576 extern enum machine_mode get_pool_mode ();
577 extern int get_pool_offset ();
578 extern rtx get_parm_real_loc ();
579 extern rtx assign_stack_local ();
580 extern rtx assign_stack_temp ();
581 extern rtx protect_from_queue ();
582 extern void emit_queue ();
583 extern rtx emit_move_insn ();
584 extern rtx emit_insn_before ();
585 extern rtx emit_jump_insn_before ();
586 extern rtx emit_call_insn_before ();
587 extern rtx emit_barrier_before ();
588 extern rtx emit_note_before ();
589 extern rtx emit_insn_after ();
590 extern rtx emit_jump_insn_after ();
591 extern rtx emit_barrier_after ();
592 extern rtx emit_label_after ();
593 extern rtx emit_note_after ();
594 extern rtx emit_line_note_after ();
595 extern rtx emit_insn ();
596 extern rtx emit_insns ();
597 extern rtx emit_insns_before ();
598 extern rtx emit_jump_insn ();
599 extern rtx emit_call_insn ();
600 extern rtx emit_label ();
601 extern rtx emit_barrier ();
602 extern rtx emit_line_note ();
603 extern rtx emit_note ();
604 extern rtx emit_line_note_force ();
605 extern rtx make_insn_raw ();
606 extern rtx previous_insn ();
607 extern rtx next_insn ();
608 extern rtx prev_nonnote_insn ();
609 extern rtx next_nonnote_insn ();
610 extern rtx prev_real_insn ();
611 extern rtx next_real_insn ();
612 extern rtx prev_active_insn ();
613 extern rtx next_active_insn ();
614 extern rtx prev_label ();
615 extern rtx next_label ();
616 extern rtx next_cc0_user ();
617 extern rtx prev_cc0_setter ();
618 extern rtx reg_set_last ();
619 extern rtx next_nondeleted_insn ();
620 extern enum rtx_code reverse_condition ();
621 extern enum rtx_code swap_condition ();
622 extern enum rtx_code unsigned_condition ();
623 extern enum rtx_code signed_condition ();
624 extern rtx plus_constant (), plus_constant_for_output ();
625 extern rtx find_equiv_reg ();
626 extern rtx squeeze_notes ();
627 extern rtx delete_insn ();
628 extern void delete_jump ();
629 extern rtx get_label_before ();
630 extern rtx get_label_after ();
631 extern rtx follow_jumps ();
632 extern rtx adj_offsettable_operand ();
633 extern rtx try_split ();
634 extern rtx split_insns ();
635 extern rtx simplify_unary_operation (), simplify_binary_operation ();
636 extern rtx simplify_ternary_operation (), simplify_relational_operation ();
637 extern rtx nonlocal_label_rtx_list ();
639 /* Maximum number of parallel sets and clobbers in any insn in this fn.
640 Always at least 3, since the combiner could put that many togetherm
641 and we want this to remain correct for all the remaining passes. */
643 extern int max_parallel;
645 extern int asm_noperands ();
646 extern char *decode_asm_operands ();
649 /* Conditional is to detect when config.h has been included. */
650 extern enum reg_class reg_preferred_class ();
651 extern enum reg_class reg_alternate_class ();
654 extern rtx get_first_nonparm_insn ();
656 /* Standard pieces of rtx, to be substituted directly into things. */
659 extern rtx const0_rtx;
660 extern rtx const1_rtx;
661 extern rtx const2_rtx;
662 extern rtx constm1_rtx;
663 extern rtx const_true_rtx;
665 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
667 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
670 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
672 /* Likewise, for the constants 1 and 2. */
674 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
675 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
677 /* All references to certain hard regs, except those created
678 by allocating pseudo regs into them (when that's possible),
679 go through these unique rtx objects. */
680 extern rtx stack_pointer_rtx;
681 extern rtx frame_pointer_rtx;
682 extern rtx arg_pointer_rtx;
683 extern rtx pic_offset_table_rtx;
684 extern rtx struct_value_rtx;
685 extern rtx struct_value_incoming_rtx;
686 extern rtx static_chain_rtx;
687 extern rtx static_chain_incoming_rtx;
689 /* Virtual registers are used during RTL generation to refer to locations into
690 the stack frame when the actual location isn't known until RTL generation
691 is complete. The routine instantiate_virtual_regs replaces these with
692 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
695 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
697 /* This points to the first word of the incoming arguments passed on the stack,
698 either by the caller or by the callee when pretending it was passed by the
701 extern rtx virtual_incoming_args_rtx;
703 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
705 /* If FRAME_GROWS_DOWNWARDS, this points to immediately above the first
706 variable on the stack. Otherwise, it points to the first variable on
709 extern rtx virtual_stack_vars_rtx;
711 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
713 /* This points to the location of dynamically-allocated memory on the stack
714 immediately after the stack pointer has been adjusted by the amount
717 extern rtx virtual_stack_dynamic_rtx;
719 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
721 /* This points to the location in the stack at which outgoing arguments should
722 be written when the stack is pre-pushed (arguments pushed using push
723 insns always use sp). */
725 extern rtx virtual_outgoing_args_rtx;
727 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
729 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 3)
731 extern rtx find_next_ref ();
732 extern rtx *find_single_use ();
734 /* Define a default value for STORE_FLAG_VALUE. */
736 #ifndef STORE_FLAG_VALUE
737 #define STORE_FLAG_VALUE 1
740 /* Nonzero after end of reload pass.
741 Set to 1 or 0 by toplev.c. */
743 extern int reload_completed;
745 /* Set to 1 while reload_as_needed is operating.
746 Required by some machines to handle any generated moves differently. */
748 extern int reload_in_progress;
750 /* If this is nonzero, we do not bother generating VOLATILE
751 around volatile memory references, and we are willing to
752 output indirect addresses. If cse is to follow, we reject
753 indirect addresses so a useful potential cse is generated;
754 if it is used only once, instruction combination will produce
755 the same indirect address eventually. */
756 extern int cse_not_expected;
758 /* Indexed by pseudo register number, gives the rtx for that pseudo.
759 Allocated in parallel with regno_pointer_flag. */
760 extern rtx *regno_reg_rtx;