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 convienent way to get a value for
37 Assumes default enum value assignement. */
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_ANULLED_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 /* Don't forget to change note_insn_name in rtl.c. */
341 #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
342 #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
343 #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
344 #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
345 #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
347 /* Names for NOTE insn's other than line numbers. */
349 extern char *note_insn_name[];
350 #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
352 /* The name of a label, in case it corresponds to an explicit label
353 in the input source code. */
354 #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
356 /* In jump.c, each label contains a count of the number
357 of LABEL_REFs that point at it, so unused labels can be deleted. */
358 #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
360 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
361 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
362 be decremented and possibly the label can be deleted. */
363 #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx)
365 /* Once basic blocks are found in flow.c,
366 each CODE_LABEL starts a chain that goes through
367 all the LABEL_REFs that jump to that label.
368 The chain eventually winds up at the CODE_LABEL; it is circular. */
369 #define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx)
371 /* This is the field in the LABEL_REF through which the circular chain
372 of references to a particular label is linked.
373 This chain is set up in flow.c. */
375 #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
377 /* Once basic blocks are found in flow.c,
378 Each LABEL_REF points to its containing instruction with this field. */
380 #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
382 /* For a REG rtx, REGNO extracts the register number. */
384 #define REGNO(RTX) ((RTX)->fld[0].rtint)
386 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
387 is the current function's return value. */
389 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
391 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
392 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
394 /* For a CONST_INT rtx, INTVAL extracts the integer. */
396 #define INTVAL(RTX) ((RTX)->fld[0].rtint)
398 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
399 SUBREG_WORD extracts the word-number. */
401 #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
402 #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
404 /* Access various components of an ASM_OPERANDS rtx. */
406 #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
407 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
408 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
409 #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
410 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
411 #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
412 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
413 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
414 #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
415 #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
416 #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
418 /* For a MEM rtx, 1 if it's a volatile reference.
419 Also in an ASM_OPERANDS rtx. */
420 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
422 /* For a MEM rtx, 1 if it refers to a structure or union component. */
423 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
425 /* For a LABEL_REF, 1 means that this reference is to a label outside the
426 loop containing the reference. */
427 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
429 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
430 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
432 /* For a REG, 1 means the register is used only in an exit test of a loop. */
433 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
435 /* During sched, for an insn, 1 means that the insn must be scheduled together
436 with the preceding insn. */
437 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
439 /* For a SET rtx, SET_DEST is the place that is set
440 and SET_SRC is the value it is set to. */
441 #define SET_DEST(RTX) ((RTX)->fld[0].rtx)
442 #define SET_SRC(RTX) ((RTX)->fld[1].rtx)
444 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
445 #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
447 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
448 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
450 /* Flag in a SYMBOL_REF for machine-specific purposes. */
451 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
453 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
454 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
456 /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
457 of the function that is not involved in copying parameters to
458 pseudo-registers. FIRST_PARM_INSN is the very first insn of
459 the function, including the parameter copying.
460 We keep this around in case we must splice
461 this function into the assembly code at the end of the file.
462 FIRST_LABELNO is the first label number used by the function (inclusive).
463 LAST_LABELNO is the last label used by the function (exclusive).
464 MAX_REGNUM is the largest pseudo-register used by that function.
465 FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
466 POPS_ARGS is the number of bytes of input arguments popped by the function
467 STACK_SLOT_LIST is the list of stack slots.
468 FUNCTION_FLAGS are where single-bit flags are saved.
469 OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
470 ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
471 for the function arguments.
472 ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
475 We want this to lay down like an INSN. The PREV_INSN field
476 is always NULL. The NEXT_INSN field always points to the
477 first function insn of the function being squirreled away. */
479 #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
480 #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
481 #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
482 #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
483 #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
484 #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
485 #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
486 #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
487 #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
488 #define FUNCTION_FLAGS(RTX) ((RTX)->fld[11].rtint)
489 #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[12].rtint)
490 #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[13].rtvec)
491 #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[14].rtx)
493 /* In FUNCTION_FLAGS we save some variables computed when emitting the code
494 for the function and which must be `or'ed into the current flag values when
495 insns from that function are being inlined. */
497 /* These ought to be an enum, but non-ANSI compilers don't like that. */
498 #define FUNCTION_FLAGS_CALLS_ALLOCA 01
499 #define FUNCTION_FLAGS_CALLS_SETJMP 02
500 #define FUNCTION_FLAGS_RETURNS_STRUCT 04
501 #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
502 #define FUNCTION_FLAGS_NEEDS_CONTEXT 020
503 #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
504 #define FUNCTION_FLAGS_RETURNS_POINTER 0100
505 #define FUNCTION_FLAGS_USES_CONST_POOL 0200
506 #define FUNCTION_FLAGS_CALLS_LONGJMP 0400
507 #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000
509 /* Define a macro to look for REG_INC notes,
510 but save time on machines where they never exist. */
512 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) \
513 || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
514 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
516 #define FIND_REG_INC_NOTE(insn, reg) 0
519 /* Indicate whether the machine has any sort of auto increment addressing.
520 If not, we can avoid checking for REG_INC notes. */
522 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) \
523 || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
527 /* Generally useful functions. */
529 extern rtx rtx_alloc ();
530 extern rtvec rtvec_alloc ();
531 extern rtx find_reg_note ();
532 extern rtx find_regno_note ();
533 extern int get_integer_term ();
534 extern rtx get_related_value ();
535 extern rtx single_set ();
536 extern rtx find_last_value ();
537 extern rtx gen_rtx ();
538 extern rtx copy_rtx ();
539 extern rtx copy_rtx_if_shared ();
540 extern rtx copy_most_rtx ();
541 extern rtx replace_rtx ();
542 extern rtvec gen_rtvec ();
543 extern rtvec gen_rtvec_v ();
544 extern rtx read_rtx ();
545 extern rtx gen_reg_rtx ();
546 extern rtx gen_label_rtx ();
547 extern rtx gen_inline_header_rtx ();
548 extern rtx gen_lowpart_common ();
549 extern rtx gen_lowpart ();
550 extern rtx gen_lowpart_if_possible ();
551 extern rtx operand_subword ();
552 extern rtx operand_subword_force ();
553 extern int subreg_lowpart_p ();
554 extern rtx make_safe_from ();
555 extern rtx memory_address ();
556 extern rtx get_insns ();
557 extern rtx get_last_insn ();
558 extern rtx get_last_insn_anywhere ();
559 extern void start_sequence ();
560 extern void push_to_sequence ();
561 extern void end_sequence ();
562 extern rtx gen_sequence ();
563 extern rtx expand_expr ();
564 extern rtx output_constant_def ();
565 extern rtx immed_real_const ();
566 extern rtx immed_real_const_1 ();
567 extern rtx immed_double_const ();
568 extern rtx force_const_mem ();
569 extern rtx get_pool_constant ();
570 extern enum machine_mode get_pool_mode ();
571 extern int get_pool_offset ();
572 extern rtx get_parm_real_loc ();
573 extern rtx assign_stack_local ();
574 extern rtx assign_stack_temp ();
575 extern rtx protect_from_queue ();
576 extern void emit_queue ();
577 extern rtx emit_move_insn ();
578 extern rtx emit_insn_before ();
579 extern rtx emit_jump_insn_before ();
580 extern rtx emit_call_insn_before ();
581 extern rtx emit_barrier_before ();
582 extern rtx emit_note_before ();
583 extern rtx emit_insn_after ();
584 extern rtx emit_jump_insn_after ();
585 extern rtx emit_barrier_after ();
586 extern rtx emit_label_after ();
587 extern rtx emit_note_after ();
588 extern rtx emit_line_note_after ();
589 extern rtx emit_insn ();
590 extern rtx emit_insns ();
591 extern rtx emit_insns_before ();
592 extern rtx emit_jump_insn ();
593 extern rtx emit_call_insn ();
594 extern rtx emit_label ();
595 extern rtx emit_barrier ();
596 extern rtx emit_line_note ();
597 extern rtx emit_note ();
598 extern rtx emit_line_note_force ();
599 extern rtx make_insn_raw ();
600 extern rtx previous_insn ();
601 extern rtx next_insn ();
602 extern rtx prev_nonnote_insn ();
603 extern rtx next_nonnote_insn ();
604 extern rtx prev_real_insn ();
605 extern rtx next_real_insn ();
606 extern rtx prev_active_insn ();
607 extern rtx next_active_insn ();
608 extern rtx prev_label ();
609 extern rtx next_label ();
610 extern rtx next_cc0_user ();
611 extern rtx prev_cc0_setter ();
612 extern rtx reg_set_last ();
613 extern rtx next_nondeleted_insn ();
614 extern enum rtx_code reverse_condition ();
615 extern enum rtx_code swap_condition ();
616 extern enum rtx_code unsigned_condition ();
617 extern enum rtx_code signed_condition ();
618 extern rtx plus_constant (), plus_constant_for_output ();
619 extern rtx find_equiv_reg ();
620 extern rtx delete_insn ();
621 extern void delete_jump ();
622 extern rtx get_label_before ();
623 extern rtx get_label_after ();
624 extern rtx follow_jumps ();
625 extern rtx adj_offsettable_operand ();
626 extern rtx try_split ();
627 extern rtx split_insns ();
628 extern rtx simplify_unary_operation (), simplify_binary_operation ();
629 extern rtx simplify_ternary_operation (), simplify_relational_operation ();
630 extern rtx nonlocal_label_rtx_list ();
632 /* Maximum number of parallel sets and clobbers in any insn in this fn.
633 Always at least 3, since the combiner could put that many togetherm
634 and we want this to remain correct for all the remaining passes. */
636 extern int max_parallel;
638 extern int asm_noperands ();
639 extern char *decode_asm_operands ();
642 /* Conditional is to detect when config.h has been included. */
643 extern enum reg_class reg_preferred_class ();
646 extern rtx get_first_nonparm_insn ();
648 /* Standard pieces of rtx, to be substituted directly into things. */
651 extern rtx const0_rtx;
652 extern rtx const1_rtx;
653 extern rtx const2_rtx;
654 extern rtx constm1_rtx;
655 extern rtx const_true_rtx;
657 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
659 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
662 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
664 /* Likewise, for the constants 1 and 2. */
666 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
667 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
669 /* All references to certain hard regs, except those created
670 by allocating pseudo regs into them (when that's possible),
671 go through these unique rtx objects. */
672 extern rtx stack_pointer_rtx;
673 extern rtx frame_pointer_rtx;
674 extern rtx arg_pointer_rtx;
675 extern rtx pic_offset_table_rtx;
676 extern rtx struct_value_rtx;
677 extern rtx struct_value_incoming_rtx;
678 extern rtx static_chain_rtx;
679 extern rtx static_chain_incoming_rtx;
681 /* Virtual registers are used during RTL generation to refer to locations into
682 the stack frame when the actual location isn't known until RTL generation
683 is complete. The routine instantiate_virtual_regs replaces these with
684 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
687 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
689 /* This points to the first word of the incoming arguments passed on the stack,
690 either by the caller or by the callee when pretending it was passed by the
693 extern rtx virtual_incoming_args_rtx;
695 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
697 /* If FRAME_GROWS_DOWNWARDS, this points to immediately above the first
698 variable on the stack. Otherwise, it points to the first variable on
701 extern rtx virtual_stack_vars_rtx;
703 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
705 /* This points to the location of dynamically-allocated memory on the stack
706 immediately after the stack pointer has been adjusted by the amount
709 extern rtx virtual_stack_dynamic_rtx;
711 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
713 /* This points to the location in the stack at which outgoing arguments should
714 be written when the stack is pre-pushed (arguments pushed using push
715 insns always use sp). */
717 extern rtx virtual_outgoing_args_rtx;
719 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
721 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 3)
723 extern rtx find_next_ref ();
724 extern rtx *find_single_use ();
726 /* Define a default value for STORE_FLAG_VALUE. */
728 #ifndef STORE_FLAG_VALUE
729 #define STORE_FLAG_VALUE 1
732 /* Nonzero after end of reload pass.
733 Set to 1 or 0 by toplev.c. */
735 extern int reload_completed;
737 /* Set to 1 while reload_as_needed is operating.
738 Required by some machines to handle any generated moves differently. */
740 extern int reload_in_progress;
742 /* If this is nonzero, we do not bother generating VOLATILE
743 around volatile memory references, and we are willing to
744 output indirect addresses. If cse is to follow, we reject
745 indirect addresses so a useful potential cse is generated;
746 if it is used only once, instruction combination will produce
747 the same indirect address eventually. */
748 extern int cse_not_expected;
750 /* Indexed by pseudo register number, gives the rtx for that pseudo.
751 Allocated in parallel with regno_pointer_flag. */
752 extern rtx *regno_reg_rtx;