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1 | /* Register Transfer Language (RTL) definitions for GNU C-Compiler |
2 | Copyright (C) 1987, 1991, 1992 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU CC. | |
5 | ||
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) | |
9 | any later version. | |
10 | ||
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. | |
15 | ||
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. */ | |
19 | ||
20 | ||
21 | #include "machmode.h" | |
22 | ||
23 | #undef FFS /* Some systems predefine this symbol; don't let it interfere. */ | |
24 | #undef FLOAT /* Likewise. */ | |
25 | #undef ABS /* Likewise. */ | |
26 | #undef PC /* Likewise. */ | |
27 | ||
28 | /* Register Transfer Language EXPRESSIONS CODES */ | |
29 | ||
30 | #define RTX_CODE enum rtx_code | |
31 | enum rtx_code { | |
32 | ||
33 | #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM , | |
34 | #include "rtl.def" /* rtl expressions are documented here */ | |
35 | #undef DEF_RTL_EXPR | |
36 | ||
37 | LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for | |
38 | NUM_RTX_CODE. | |
39 | Assumes default enum value assignment. */ | |
40 | ||
41 | #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE) | |
42 | /* The cast here, saves many elsewhere. */ | |
43 | ||
44 | extern int rtx_length[]; | |
45 | #define GET_RTX_LENGTH(CODE) (rtx_length[(int)(CODE)]) | |
46 | ||
47 | extern char *rtx_name[]; | |
48 | #define GET_RTX_NAME(CODE) (rtx_name[(int)(CODE)]) | |
49 | ||
50 | extern char *rtx_format[]; | |
51 | #define GET_RTX_FORMAT(CODE) (rtx_format[(int)(CODE)]) | |
52 | ||
53 | extern char rtx_class[]; | |
54 | #define GET_RTX_CLASS(CODE) (rtx_class[(int)(CODE)]) | |
55 | \f | |
56 | /* Common union for an element of an rtx. */ | |
57 | ||
58 | typedef union rtunion_def | |
59 | { | |
60 | HOST_WIDE_INT rtwint; | |
61 | int rtint; | |
62 | char *rtstr; | |
63 | struct rtx_def *rtx; | |
64 | struct rtvec_def *rtvec; | |
65 | enum machine_mode rttype; | |
66 | } rtunion; | |
67 | ||
68 | /* RTL expression ("rtx"). */ | |
69 | ||
70 | typedef struct rtx_def | |
71 | { | |
72 | #ifdef ONLY_INT_FIELDS | |
73 | #ifdef CODE_FIELD_BUG | |
74 | unsigned int code : 16; | |
75 | #else | |
76 | unsigned short code; | |
77 | #endif | |
78 | #else | |
79 | /* The kind of expression this is. */ | |
80 | enum rtx_code code : 16; | |
81 | #endif | |
82 | /* The kind of value the expression has. */ | |
83 | #ifdef ONLY_INT_FIELDS | |
84 | int mode : 8; | |
85 | #else | |
86 | enum machine_mode mode : 8; | |
87 | #endif | |
88 | /* 1 in an INSN if it can alter flow of control | |
89 | within this function. Not yet used! */ | |
90 | unsigned int jump : 1; | |
91 | /* 1 in an INSN if it can call another function. Not yet used! */ | |
92 | unsigned int call : 1; | |
93 | /* 1 in a MEM or REG if value of this expression will never change | |
94 | during the current function, even though it is not | |
95 | manifestly constant. | |
96 | 1 in a SUBREG if it is from a promoted variable that is unsigned. | |
97 | 1 in a SYMBOL_REF if it addresses something in the per-function | |
98 | constants pool. | |
99 | 1 in a CALL_INSN if it is a const call. | |
100 | 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from | |
101 | reorg until end of compilation; cleared before used. */ | |
102 | unsigned int unchanging : 1; | |
103 | /* 1 in a MEM expression if contents of memory are volatile. | |
104 | 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER | |
105 | if it is deleted. | |
106 | 1 in a REG expression if corresponds to a variable declared by the user. | |
107 | 0 for an internally generated temporary. | |
108 | In a SYMBOL_REF, this flag is used for machine-specific purposes. | |
109 | In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */ | |
110 | unsigned int volatil : 1; | |
111 | /* 1 in a MEM referring to a field of a structure (not a union!). | |
112 | 0 if the MEM was a variable or the result of a * operator in C; | |
113 | 1 if it was the result of a . or -> operator (on a struct) in C. | |
114 | 1 in a REG if the register is used only in exit code a loop. | |
115 | 1 in a SUBREG expression if was generated from a variable with a | |
116 | promoted mode. | |
117 | 1 in a CODE_LABEL if the label is used for nonlocal gotos | |
118 | and must not be deleted even if its count is zero. | |
119 | 1 in a LABEL_REF if this is a reference to a label outside the | |
120 | current loop. | |
121 | 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled | |
122 | together with the preceding insn. Valid only within sched. | |
123 | 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and | |
124 | from the target of a branch. Valid from reorg until end of compilation; | |
125 | cleared before used. */ | |
126 | unsigned int in_struct : 1; | |
127 | /* 1 if this rtx is used. This is used for copying shared structure. | |
128 | See `unshare_all_rtl'. | |
129 | In a REG, this is not needed for that purpose, and used instead | |
130 | in `leaf_renumber_regs_insn'. | |
131 | In a SYMBOL_REF, means that emit_library_call | |
132 | has used it as the function. */ | |
133 | unsigned int used : 1; | |
134 | /* Nonzero if this rtx came from procedure integration. | |
135 | In a REG, nonzero means this reg refers to the return value | |
136 | of the current function. */ | |
137 | unsigned integrated : 1; | |
138 | /* The first element of the operands of this rtx. | |
139 | The number of operands and their types are controlled | |
140 | by the `code' field, according to rtl.def. */ | |
141 | rtunion fld[1]; | |
142 | } *rtx; | |
143 | ||
144 | /* Add prototype support. */ | |
145 | #ifndef PROTO | |
146 | #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__) | |
147 | #define PROTO(ARGS) ARGS | |
148 | #else | |
149 | #define PROTO(ARGS) () | |
150 | #endif | |
151 | #endif | |
152 | ||
153 | #define NULL_RTX (rtx) 0 | |
154 | ||
155 | /* Define a generic NULL if one hasn't already been defined. */ | |
156 | ||
157 | #ifndef NULL | |
158 | #define NULL 0 | |
159 | #endif | |
160 | ||
161 | #ifndef GENERIC_PTR | |
162 | #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__) | |
163 | #define GENERIC_PTR void * | |
164 | #else | |
165 | #define GENERIC_PTR char * | |
166 | #endif | |
167 | #endif | |
168 | ||
169 | #ifndef NULL_PTR | |
170 | #define NULL_PTR ((GENERIC_PTR)0) | |
171 | #endif | |
172 | ||
173 | /* Define macros to access the `code' field of the rtx. */ | |
174 | ||
175 | #ifdef SHORT_ENUM_BUG | |
176 | #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code)) | |
177 | #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE))) | |
178 | #else | |
179 | #define GET_CODE(RTX) ((RTX)->code) | |
180 | #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE)) | |
181 | #endif | |
182 | ||
183 | #define GET_MODE(RTX) ((RTX)->mode) | |
184 | #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE)) | |
185 | ||
186 | #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated) | |
187 | #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging) | |
188 | ||
189 | /* RTL vector. These appear inside RTX's when there is a need | |
190 | for a variable number of things. The principle use is inside | |
191 | PARALLEL expressions. */ | |
192 | ||
193 | typedef struct rtvec_def{ | |
194 | unsigned num_elem; /* number of elements */ | |
195 | rtunion elem[1]; | |
196 | } *rtvec; | |
197 | ||
198 | #define NULL_RTVEC (rtvec) 0 | |
199 | ||
200 | #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem) | |
201 | #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (unsigned) NUM) | |
202 | ||
203 | #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx) | |
204 | ||
205 | /* 1 if X is a REG. */ | |
206 | ||
207 | #define REG_P(X) (GET_CODE (X) == REG) | |
208 | ||
209 | /* 1 if X is a constant value that is an integer. */ | |
210 | ||
211 | #define CONSTANT_P(X) \ | |
212 | (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \ | |
213 | || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \ | |
214 | || GET_CODE (X) == CONST || GET_CODE (X) == HIGH) | |
215 | ||
216 | /* General accessor macros for accessing the fields of an rtx. */ | |
217 | ||
218 | #define XEXP(RTX, N) ((RTX)->fld[N].rtx) | |
219 | #define XINT(RTX, N) ((RTX)->fld[N].rtint) | |
220 | #define XWINT(RTX, N) ((RTX)->fld[N].rtwint) | |
221 | #define XSTR(RTX, N) ((RTX)->fld[N].rtstr) | |
222 | #define XVEC(RTX, N) ((RTX)->fld[N].rtvec) | |
223 | #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem) | |
224 | #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx) | |
225 | \f | |
226 | /* ACCESS MACROS for particular fields of insns. */ | |
227 | ||
228 | /* Holds a unique number for each insn. | |
229 | These are not necessarily sequentially increasing. */ | |
230 | #define INSN_UID(INSN) ((INSN)->fld[0].rtint) | |
231 | ||
232 | /* Chain insns together in sequence. */ | |
233 | #define PREV_INSN(INSN) ((INSN)->fld[1].rtx) | |
234 | #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx) | |
235 | ||
236 | /* The body of an insn. */ | |
237 | #define PATTERN(INSN) ((INSN)->fld[3].rtx) | |
238 | ||
239 | /* Code number of instruction, from when it was recognized. | |
240 | -1 means this instruction has not been recognized yet. */ | |
241 | #define INSN_CODE(INSN) ((INSN)->fld[4].rtint) | |
242 | ||
243 | /* Set up in flow.c; empty before then. | |
244 | Holds a chain of INSN_LIST rtx's whose first operands point at | |
245 | previous insns with direct data-flow connections to this one. | |
246 | That means that those insns set variables whose next use is in this insn. | |
247 | They are always in the same basic block as this insn. */ | |
248 | #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx) | |
249 | ||
250 | /* 1 if insn has been deleted. */ | |
251 | #define INSN_DELETED_P(INSN) ((INSN)->volatil) | |
252 | ||
253 | /* 1 if insn is a call to a const function. */ | |
254 | #define CONST_CALL_P(INSN) ((INSN)->unchanging) | |
255 | ||
256 | /* 1 if insn is a branch that should not unconditionally execute its | |
257 | delay slots, i.e., it is an annulled branch. */ | |
258 | #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging) | |
259 | ||
260 | /* 1 if insn is in a delay slot and is from the target of the branch. If | |
261 | the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be | |
262 | executed if the branch is taken. For annulled branches with this bit | |
263 | clear, the insn should be executed only if the branch is not taken. */ | |
264 | #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct) | |
265 | ||
266 | /* Holds a list of notes on what this insn does to various REGs. | |
267 | It is a chain of EXPR_LIST rtx's, where the second operand | |
268 | is the chain pointer and the first operand is the REG being described. | |
269 | The mode field of the EXPR_LIST contains not a real machine mode | |
270 | but a value that says what this note says about the REG: | |
271 | REG_DEAD means that the value in REG dies in this insn (i.e., it is | |
272 | not needed past this insn). If REG is set in this insn, the REG_DEAD | |
273 | note may, but need not, be omitted. | |
274 | REG_INC means that the REG is autoincremented or autodecremented. | |
275 | REG_EQUIV describes the insn as a whole; it says that the | |
276 | insn sets a register to a constant value or to be equivalent to | |
277 | a memory address. If the | |
278 | register is spilled to the stack then the constant value | |
279 | should be substituted for it. The contents of the REG_EQUIV | |
280 | is the constant value or memory address, which may be different | |
281 | from the source of the SET although it has the same value. | |
282 | REG_EQUAL is like REG_EQUIV except that the destination | |
283 | is only momentarily equal to the specified rtx. Therefore, it | |
284 | cannot be used for substitution; but it can be used for cse. | |
285 | REG_RETVAL means that this insn copies the return-value of | |
286 | a library call out of the hard reg for return values. This note | |
287 | is actually an INSN_LIST and it points to the first insn involved | |
288 | in setting up arguments for the call. flow.c uses this to delete | |
289 | the entire library call when its result is dead. | |
290 | REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn | |
291 | of the library call and points at the one that has the REG_RETVAL. | |
292 | REG_WAS_0 says that the register set in this insn held 0 before the insn. | |
293 | The contents of the note is the insn that stored the 0. | |
294 | If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative. | |
295 | The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST. | |
296 | REG_NONNEG means that the register is always nonnegative during | |
297 | the containing loop. This is used in branches so that decrement and | |
298 | branch instructions terminating on zero can be matched. There must be | |
299 | an insn pattern in the md file named `decrement_and_branch_until_zero' | |
300 | or else this will never be added to any instructions. | |
301 | REG_NO_CONFLICT means there is no conflict *after this insn* | |
302 | between the register in the note and the destination of this insn. | |
303 | REG_UNUSED identifies a register set in this insn and never used. | |
304 | REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use | |
305 | CC0, respectively. Normally, these are required to be consecutive insns, | |
306 | but we permit putting a cc0-setting insn in the delay slot of a branch | |
307 | as long as only one copy of the insn exists. In that case, these notes | |
308 | point from one to the other to allow code generation to determine what | |
309 | any require information and to properly update CC_STATUS. | |
310 | REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to | |
311 | say that the CODE_LABEL contained in the REG_LABEL note is used | |
312 | by the insn. | |
313 | REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read) | |
314 | dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output | |
315 | (write after write) dependencies. Data dependencies, which are the only | |
316 | type of LOG_LINK created by flow, are represented by a 0 reg note kind. */ | |
317 | ||
318 | #define REG_NOTES(INSN) ((INSN)->fld[6].rtx) | |
319 | ||
320 | /* Don't forget to change reg_note_name in rtl.c. */ | |
321 | enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4, | |
322 | REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7, | |
323 | REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10, | |
324 | REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13, | |
325 | REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15 }; | |
326 | ||
327 | /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */ | |
328 | #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK)) | |
329 | #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND)) | |
330 | ||
331 | /* Names for REG_NOTE's in EXPR_LIST insn's. */ | |
332 | ||
333 | extern char *reg_note_name[]; | |
334 | #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int)(MODE)]) | |
335 | ||
336 | /* The label-number of a code-label. The assembler label | |
337 | is made from `L' and the label-number printed in decimal. | |
338 | Label numbers are unique in a compilation. */ | |
339 | #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint) | |
340 | ||
341 | #define LINE_NUMBER NOTE | |
342 | ||
343 | /* In a NOTE that is a line number, this is a string for the file name | |
344 | that the line is in. We use the same field to record block numbers | |
345 | temporarily in NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. | |
346 | (We avoid lots of casts between ints and pointers if we use a | |
347 | different macro for the bock number.) */ | |
348 | ||
349 | #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr) | |
350 | #define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint) | |
351 | ||
352 | /* In a NOTE that is a line number, this is the line number. | |
353 | Other kinds of NOTEs are identified by negative numbers here. */ | |
354 | #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint) | |
355 | ||
356 | /* Codes that appear in the NOTE_LINE_NUMBER field | |
357 | for kinds of notes that are not line numbers. | |
358 | ||
359 | Notice that we do not try to use zero here for any of | |
360 | the special note codes because sometimes the source line | |
361 | actually can be zero! This happens (for example) when we | |
362 | are generating code for the per-translation-unit constructor | |
363 | and destructor routines for some C++ translation unit. | |
364 | ||
365 | If you should change any of the following values, or if you | |
366 | should add a new value here, don't forget to change the | |
367 | note_insn_name array in rtl.c. */ | |
368 | ||
369 | /* This note is used to get rid of an insn | |
370 | when it isn't safe to patch the insn out of the chain. */ | |
371 | #define NOTE_INSN_DELETED -1 | |
372 | #define NOTE_INSN_BLOCK_BEG -2 | |
373 | #define NOTE_INSN_BLOCK_END -3 | |
374 | #define NOTE_INSN_LOOP_BEG -4 | |
375 | #define NOTE_INSN_LOOP_END -5 | |
376 | /* This kind of note is generated at the end of the function body, | |
377 | just before the return insn or return label. | |
378 | In an optimizing compilation it is deleted by the first jump optimization, | |
379 | after enabling that optimizer to determine whether control can fall | |
380 | off the end of the function body without a return statement. */ | |
381 | #define NOTE_INSN_FUNCTION_END -6 | |
382 | /* This kind of note is generated just after each call to `setjmp', et al. */ | |
383 | #define NOTE_INSN_SETJMP -7 | |
384 | /* Generated at the place in a loop that `continue' jumps to. */ | |
385 | #define NOTE_INSN_LOOP_CONT -8 | |
386 | /* Generated at the start of a duplicated exit test. */ | |
387 | #define NOTE_INSN_LOOP_VTOP -9 | |
388 | /* This marks the point immediately after the last prologue insn. */ | |
389 | #define NOTE_INSN_PROLOGUE_END -10 | |
390 | /* This marks the point immediately prior to the first epilogue insn. */ | |
391 | #define NOTE_INSN_EPILOGUE_BEG -11 | |
392 | /* Generated in place of user-declared labels when they are deleted. */ | |
393 | #define NOTE_INSN_DELETED_LABEL -12 | |
394 | /* This note indicates the start of the real body of the function, | |
395 | i.e. the point just after all of the parms have been moved into | |
396 | their homes, etc. */ | |
397 | #define NOTE_INSN_FUNCTION_BEG -13 | |
398 | ||
399 | ||
400 | #if 0 /* These are not used, and I don't know what they were for. --rms. */ | |
401 | #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr) | |
402 | #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint) | |
403 | #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx) | |
404 | #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint) | |
405 | #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint) | |
406 | #endif /* 0 */ | |
407 | ||
408 | /* Names for NOTE insn's other than line numbers. */ | |
409 | ||
410 | extern char *note_insn_name[]; | |
411 | #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)]) | |
412 | ||
413 | /* The name of a label, in case it corresponds to an explicit label | |
414 | in the input source code. */ | |
415 | #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr) | |
416 | ||
417 | /* In jump.c, each label contains a count of the number | |
418 | of LABEL_REFs that point at it, so unused labels can be deleted. */ | |
419 | #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint) | |
420 | ||
421 | /* In jump.c, each JUMP_INSN can point to a label that it can jump to, | |
422 | so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can | |
423 | be decremented and possibly the label can be deleted. */ | |
424 | #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx) | |
425 | ||
426 | /* Once basic blocks are found in flow.c, | |
427 | each CODE_LABEL starts a chain that goes through | |
428 | all the LABEL_REFs that jump to that label. | |
429 | The chain eventually winds up at the CODE_LABEL; it is circular. */ | |
430 | #define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx) | |
431 | \f | |
432 | /* This is the field in the LABEL_REF through which the circular chain | |
433 | of references to a particular label is linked. | |
434 | This chain is set up in flow.c. */ | |
435 | ||
436 | #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx) | |
437 | ||
438 | /* Once basic blocks are found in flow.c, | |
439 | Each LABEL_REF points to its containing instruction with this field. */ | |
440 | ||
441 | #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx) | |
442 | ||
443 | /* For a REG rtx, REGNO extracts the register number. */ | |
444 | ||
445 | #define REGNO(RTX) ((RTX)->fld[0].rtint) | |
446 | ||
447 | /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg | |
448 | is the current function's return value. */ | |
449 | ||
450 | #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated) | |
451 | ||
452 | /* 1 in a REG rtx if it corresponds to a variable declared by the user. */ | |
453 | #define REG_USERVAR_P(RTX) ((RTX)->volatil) | |
454 | ||
455 | /* For a CONST_INT rtx, INTVAL extracts the integer. */ | |
456 | ||
457 | #define INTVAL(RTX) ((RTX)->fld[0].rtwint) | |
458 | ||
459 | /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of. | |
460 | SUBREG_WORD extracts the word-number. */ | |
461 | ||
462 | #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx) | |
463 | #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint) | |
464 | ||
465 | /* 1 if the REG contained in SUBREG_REG is already known to be | |
466 | sign- or zero-extended from the mode of the SUBREG to the mode of | |
467 | the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the | |
468 | extension. | |
469 | ||
470 | When used as a LHS, is means that this extension must be done | |
471 | when assigning to SUBREG_REG. */ | |
472 | ||
473 | #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct) | |
474 | #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging) | |
475 | ||
476 | /* Access various components of an ASM_OPERANDS rtx. */ | |
477 | ||
478 | #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0) | |
479 | #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1) | |
480 | #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2) | |
481 | #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3) | |
482 | #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4) | |
483 | #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N)) | |
484 | #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3) | |
485 | #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0) | |
486 | #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N))) | |
487 | #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5) | |
488 | #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6) | |
489 | ||
490 | /* For a MEM rtx, 1 if it's a volatile reference. | |
491 | Also in an ASM_OPERANDS rtx. */ | |
492 | #define MEM_VOLATILE_P(RTX) ((RTX)->volatil) | |
493 | ||
494 | /* For a MEM rtx, 1 if it refers to a structure or union component. */ | |
495 | #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct) | |
496 | ||
497 | /* For a LABEL_REF, 1 means that this reference is to a label outside the | |
498 | loop containing the reference. */ | |
499 | #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct) | |
500 | ||
501 | /* For a LABEL_REF, 1 means it is for a nonlocal label. */ | |
502 | /* Likewise in an EXPR_LIST for a REG_LABEL note. */ | |
503 | #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil) | |
504 | ||
505 | /* For a CODE_LABEL, 1 means always consider this label to be needed. */ | |
506 | #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct) | |
507 | ||
508 | /* For a REG, 1 means the register is used only in an exit test of a loop. */ | |
509 | #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct) | |
510 | ||
511 | /* During sched, for an insn, 1 means that the insn must be scheduled together | |
512 | with the preceding insn. */ | |
513 | #define SCHED_GROUP_P(INSN) ((INSN)->in_struct) | |
514 | ||
515 | /* During sched, for the LOG_LINKS of an insn, these cache the adjusted | |
516 | cost of the dependence link. The cost of executing an instruction | |
517 | may vary based on how the results are used. LINK_COST_ZERO is 1 when | |
518 | the cost through the link varies and is unchanged (i.e., the link has | |
519 | zero additional cost). LINK_COST_FREE is 1 when the cost through the | |
520 | link is zero (i.e., the link makes the cost free). In other cases, | |
521 | the adjustment to the cost is recomputed each time it is needed. */ | |
522 | #define LINK_COST_ZERO(X) ((X)->jump) | |
523 | #define LINK_COST_FREE(X) ((X)->call) | |
524 | ||
525 | /* For a SET rtx, SET_DEST is the place that is set | |
526 | and SET_SRC is the value it is set to. */ | |
527 | #define SET_DEST(RTX) ((RTX)->fld[0].rtx) | |
528 | #define SET_SRC(RTX) ((RTX)->fld[1].rtx) | |
529 | ||
530 | /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */ | |
531 | #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx) | |
532 | ||
533 | /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */ | |
534 | #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging) | |
535 | ||
536 | /* Flag in a SYMBOL_REF for machine-specific purposes. */ | |
537 | #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil) | |
538 | ||
539 | /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */ | |
540 | #define SYMBOL_REF_USED(RTX) ((RTX)->used) | |
541 | ||
542 | /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn | |
543 | of the function that is not involved in copying parameters to | |
544 | pseudo-registers. FIRST_PARM_INSN is the very first insn of | |
545 | the function, including the parameter copying. | |
546 | We keep this around in case we must splice | |
547 | this function into the assembly code at the end of the file. | |
548 | FIRST_LABELNO is the first label number used by the function (inclusive). | |
549 | LAST_LABELNO is the last label used by the function (exclusive). | |
550 | MAX_REGNUM is the largest pseudo-register used by that function. | |
551 | FUNCTION_ARGS_SIZE is the size of the argument block in the stack. | |
552 | POPS_ARGS is the number of bytes of input arguments popped by the function | |
553 | STACK_SLOT_LIST is the list of stack slots. | |
554 | FUNCTION_FLAGS are where single-bit flags are saved. | |
555 | OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list. | |
556 | ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values | |
557 | for the function arguments. | |
558 | ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the | |
559 | function. | |
560 | ||
561 | We want this to lay down like an INSN. The PREV_INSN field | |
562 | is always NULL. The NEXT_INSN field always points to the | |
563 | first function insn of the function being squirreled away. */ | |
564 | ||
565 | #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx) | |
566 | #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx) | |
567 | #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint) | |
568 | #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint) | |
569 | #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint) | |
570 | #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint) | |
571 | #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint) | |
572 | #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint) | |
573 | #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx) | |
574 | #define FUNCTION_FLAGS(RTX) ((RTX)->fld[11].rtint) | |
575 | #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[12].rtint) | |
576 | #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[13].rtvec) | |
577 | #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[14].rtx) | |
578 | ||
579 | /* In FUNCTION_FLAGS we save some variables computed when emitting the code | |
580 | for the function and which must be `or'ed into the current flag values when | |
581 | insns from that function are being inlined. */ | |
582 | ||
583 | /* These ought to be an enum, but non-ANSI compilers don't like that. */ | |
584 | #define FUNCTION_FLAGS_CALLS_ALLOCA 01 | |
585 | #define FUNCTION_FLAGS_CALLS_SETJMP 02 | |
586 | #define FUNCTION_FLAGS_RETURNS_STRUCT 04 | |
587 | #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010 | |
588 | #define FUNCTION_FLAGS_NEEDS_CONTEXT 020 | |
589 | #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040 | |
590 | #define FUNCTION_FLAGS_RETURNS_POINTER 0100 | |
591 | #define FUNCTION_FLAGS_USES_CONST_POOL 0200 | |
592 | #define FUNCTION_FLAGS_CALLS_LONGJMP 0400 | |
593 | #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000 | |
594 | ||
595 | /* Define a macro to look for REG_INC notes, | |
596 | but save time on machines where they never exist. */ | |
597 | ||
598 | /* Don't continue this line--convex cc version 4.1 would lose. */ | |
599 | #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT)) | |
600 | #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg))) | |
601 | #else | |
602 | #define FIND_REG_INC_NOTE(insn, reg) 0 | |
603 | #endif | |
604 | ||
605 | /* Indicate whether the machine has any sort of auto increment addressing. | |
606 | If not, we can avoid checking for REG_INC notes. */ | |
607 | ||
608 | /* Don't continue this line--convex cc version 4.1 would lose. */ | |
609 | #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT)) | |
610 | #define AUTO_INC_DEC | |
611 | #endif | |
612 | \f | |
613 | /* Generally useful functions. */ | |
614 | ||
615 | /* The following functions accept a wide integer argument. Rather than | |
616 | having to cast on every function call, we use a macro instead, that is | |
617 | defined here and in tree.h. */ | |
618 | ||
619 | #ifndef exact_log2 | |
620 | #define exact_log2(N) exact_log2_wide ((HOST_WIDE_INT) (N)) | |
621 | #define floor_log2(N) floor_log2_wide ((HOST_WIDE_INT) (N)) | |
622 | #endif | |
623 | ||
624 | #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C)) | |
625 | ||
626 | #define plus_constant_for_output(X,C) \ | |
627 | plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C)) | |
628 | ||
629 | extern rtx plus_constant_wide PROTO((rtx, HOST_WIDE_INT)); | |
630 | extern rtx plus_constant_for_output_wide PROTO((rtx, HOST_WIDE_INT)); | |
631 | ||
632 | #define GEN_INT(N) gen_rtx (CONST_INT, VOIDmode, (N)) | |
633 | ||
634 | #if 0 | |
635 | /* We cannot define prototypes for the variable argument functions, | |
636 | since they have not been ANSI-fied, and an ANSI compiler would | |
637 | complain when compiling the definition of these functions. */ | |
638 | ||
639 | extern rtx gen_rtx PROTO((enum rtx_code, enum machine_mode, ...)); | |
640 | extern rtvec gen_rtvec PROTO((int, ...)); | |
641 | ||
642 | #else | |
643 | extern rtx gen_rtx (); | |
644 | extern rtvec gen_rtvec (); | |
645 | #endif | |
646 | ||
647 | #ifdef BUFSIZ /* stdio.h has been included */ | |
648 | extern rtx read_rtx PROTO((FILE *)); | |
649 | #else | |
650 | extern rtx read_rtx (); | |
651 | #endif | |
652 | ||
653 | #if 0 | |
654 | /* At present, don't prototype xrealloc, since all of the callers don't | |
655 | cast their pointers to char *, and all of the xrealloc's don't use | |
656 | void * yet. */ | |
657 | extern char *xmalloc PROTO((size_t)); | |
658 | extern char *xrealloc PROTO((void *, size_t)); | |
659 | #else | |
660 | extern char *xmalloc (); | |
661 | extern char *xrealloc (); | |
662 | #endif | |
663 | ||
664 | extern char *oballoc PROTO((int)); | |
665 | extern char *permalloc PROTO((int)); | |
666 | extern void free PROTO((void *)); | |
667 | extern rtx rtx_alloc PROTO((RTX_CODE)); | |
668 | extern rtvec rtvec_alloc PROTO((int)); | |
669 | extern rtx find_reg_note PROTO((rtx, enum reg_note, rtx)); | |
670 | extern rtx find_regno_note PROTO((rtx, enum reg_note, int)); | |
671 | extern HOST_WIDE_INT get_integer_term PROTO((rtx)); | |
672 | extern rtx get_related_value PROTO((rtx)); | |
673 | extern rtx single_set PROTO((rtx)); | |
674 | extern rtx find_last_value PROTO((rtx, rtx *, rtx)); | |
675 | extern rtx copy_rtx PROTO((rtx)); | |
676 | extern rtx copy_rtx_if_shared PROTO((rtx)); | |
677 | extern rtx copy_most_rtx PROTO((rtx, rtx)); | |
678 | extern rtx replace_rtx PROTO((rtx, rtx, rtx)); | |
679 | extern rtvec gen_rtvec_v PROTO((int, rtx *)); | |
680 | extern rtx gen_reg_rtx PROTO((enum machine_mode)); | |
681 | extern rtx gen_label_rtx PROTO((void)); | |
682 | extern rtx gen_inline_header_rtx PROTO((rtx, rtx, int, int, int, int, int, int, rtx, int, int, rtvec, rtx)); | |
683 | extern rtx gen_lowpart_common PROTO((enum machine_mode, rtx)); | |
684 | extern rtx gen_lowpart PROTO((enum machine_mode, rtx)); | |
685 | extern rtx gen_lowpart_if_possible PROTO((enum machine_mode, rtx)); | |
686 | extern rtx gen_highpart PROTO((enum machine_mode, rtx)); | |
687 | extern rtx gen_realpart PROTO((enum machine_mode, rtx)); | |
688 | extern rtx gen_imagpart PROTO((enum machine_mode, rtx)); | |
689 | extern rtx operand_subword PROTO((rtx, int, int, enum machine_mode)); | |
690 | extern rtx operand_subword_force PROTO((rtx, int, enum machine_mode)); | |
691 | extern int subreg_lowpart_p PROTO((rtx)); | |
692 | extern rtx make_safe_from PROTO((rtx, rtx)); | |
693 | extern rtx memory_address PROTO((enum machine_mode, rtx)); | |
694 | extern rtx get_insns PROTO((void)); | |
695 | extern rtx get_last_insn PROTO((void)); | |
696 | extern rtx get_last_insn_anywhere PROTO((void)); | |
697 | extern void start_sequence PROTO((void)); | |
698 | extern void push_to_sequence PROTO((rtx)); | |
699 | extern void end_sequence PROTO((void)); | |
700 | extern rtx gen_sequence PROTO((void)); | |
701 | extern rtx immed_double_const PROTO((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode)); | |
702 | extern rtx force_const_mem PROTO((enum machine_mode, rtx)); | |
703 | extern rtx force_reg PROTO((enum machine_mode, rtx)); | |
704 | extern rtx get_pool_constant PROTO((rtx)); | |
705 | extern enum machine_mode get_pool_mode PROTO((rtx)); | |
706 | extern int get_pool_offset PROTO((rtx)); | |
707 | extern rtx simplify_subtraction PROTO((rtx)); | |
708 | extern rtx assign_stack_local PROTO((enum machine_mode, int, int)); | |
709 | extern rtx assign_stack_temp PROTO((enum machine_mode, int, int)); | |
710 | extern rtx protect_from_queue PROTO((rtx, int)); | |
711 | extern void emit_queue PROTO((void)); | |
712 | extern rtx emit_move_insn PROTO((rtx, rtx)); | |
713 | extern rtx emit_insn_before PROTO((rtx, rtx)); | |
714 | extern rtx emit_jump_insn_before PROTO((rtx, rtx)); | |
715 | extern rtx emit_call_insn_before PROTO((rtx, rtx)); | |
716 | extern rtx emit_barrier_before PROTO((rtx)); | |
717 | extern rtx emit_note_before PROTO((int, rtx)); | |
718 | extern rtx emit_insn_after PROTO((rtx, rtx)); | |
719 | extern rtx emit_jump_insn_after PROTO((rtx, rtx)); | |
720 | extern rtx emit_barrier_after PROTO((rtx)); | |
721 | extern rtx emit_label_after PROTO((rtx, rtx)); | |
722 | extern rtx emit_note_after PROTO((int, rtx)); | |
723 | extern rtx emit_line_note_after PROTO((char *, int, rtx)); | |
724 | extern rtx emit_insn PROTO((rtx)); | |
725 | extern rtx emit_insns PROTO((rtx)); | |
726 | extern rtx emit_insns_before PROTO((rtx, rtx)); | |
727 | extern rtx emit_jump_insn PROTO((rtx)); | |
728 | extern rtx emit_call_insn PROTO((rtx)); | |
729 | extern rtx emit_label PROTO((rtx)); | |
730 | extern rtx emit_barrier PROTO((void)); | |
731 | extern rtx emit_line_note PROTO((char *, int)); | |
732 | extern rtx emit_note PROTO((char *, int)); | |
733 | extern rtx emit_line_note_force PROTO((char *, int)); | |
734 | extern rtx make_insn_raw PROTO((rtx)); | |
735 | extern rtx previous_insn PROTO((rtx)); | |
736 | extern rtx next_insn PROTO((rtx)); | |
737 | extern rtx prev_nonnote_insn PROTO((rtx)); | |
738 | extern rtx next_nonnote_insn PROTO((rtx)); | |
739 | extern rtx prev_real_insn PROTO((rtx)); | |
740 | extern rtx next_real_insn PROTO((rtx)); | |
741 | extern rtx prev_active_insn PROTO((rtx)); | |
742 | extern rtx next_active_insn PROTO((rtx)); | |
743 | extern rtx prev_label PROTO((rtx)); | |
744 | extern rtx next_label PROTO((rtx)); | |
745 | extern rtx next_cc0_user PROTO((rtx)); | |
746 | extern rtx prev_cc0_setter PROTO((rtx)); | |
747 | extern rtx reg_set_last PROTO((rtx, rtx)); | |
748 | extern rtx next_nondeleted_insn PROTO((rtx)); | |
749 | extern enum rtx_code reverse_condition PROTO((enum rtx_code)); | |
750 | extern enum rtx_code swap_condition PROTO((enum rtx_code)); | |
751 | extern enum rtx_code unsigned_condition PROTO((enum rtx_code)); | |
752 | extern enum rtx_code signed_condition PROTO((enum rtx_code)); | |
753 | extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode)); | |
754 | extern rtx squeeze_notes PROTO((rtx, rtx)); | |
755 | extern rtx delete_insn PROTO((rtx)); | |
756 | extern void delete_jump PROTO((rtx)); | |
757 | extern rtx get_label_before PROTO((rtx)); | |
758 | extern rtx get_label_after PROTO((rtx)); | |
759 | extern rtx follow_jumps PROTO((rtx)); | |
760 | extern rtx adj_offsettable_operand PROTO((rtx, int)); | |
761 | extern rtx try_split PROTO((rtx, rtx, int)); | |
762 | extern rtx split_insns PROTO((rtx, rtx)); | |
763 | extern rtx simplify_unary_operation PROTO((enum rtx_code, enum machine_mode, rtx, enum machine_mode)); | |
764 | extern rtx simplify_binary_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx)); | |
765 | extern rtx simplify_ternary_operation PROTO((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx)); | |
766 | extern rtx simplify_relational_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx)); | |
767 | extern rtx nonlocal_label_rtx_list PROTO((void)); | |
768 | extern rtx gen_move_insn PROTO((rtx, rtx)); | |
769 | extern rtx gen_jump PROTO((rtx)); | |
770 | extern rtx gen_beq PROTO((rtx)); | |
771 | extern rtx gen_bge PROTO((rtx)); | |
772 | extern rtx gen_ble PROTO((rtx)); | |
773 | extern rtx eliminate_constant_term PROTO((rtx, rtx *)); | |
774 | extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int)); | |
775 | ||
776 | /* Maximum number of parallel sets and clobbers in any insn in this fn. | |
777 | Always at least 3, since the combiner could put that many togetherm | |
778 | and we want this to remain correct for all the remaining passes. */ | |
779 | ||
780 | extern int max_parallel; | |
781 | ||
782 | extern int asm_noperands PROTO((rtx)); | |
783 | extern char *decode_asm_operands PROTO((rtx, rtx *, rtx **, char **, enum machine_mode *)); | |
784 | ||
785 | extern enum reg_class reg_preferred_class PROTO((int)); | |
786 | extern enum reg_class reg_alternate_class PROTO((int)); | |
787 | ||
788 | extern rtx get_first_nonparm_insn PROTO((void)); | |
789 | ||
790 | /* Standard pieces of rtx, to be substituted directly into things. */ | |
791 | extern rtx pc_rtx; | |
792 | extern rtx cc0_rtx; | |
793 | extern rtx const0_rtx; | |
794 | extern rtx const1_rtx; | |
795 | extern rtx const2_rtx; | |
796 | extern rtx constm1_rtx; | |
797 | extern rtx const_true_rtx; | |
798 | ||
799 | extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE]; | |
800 | ||
801 | /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the | |
802 | same as VOIDmode. */ | |
803 | ||
804 | #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)]) | |
805 | ||
806 | /* Likewise, for the constants 1 and 2. */ | |
807 | ||
808 | #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)]) | |
809 | #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)]) | |
810 | ||
811 | /* All references to certain hard regs, except those created | |
812 | by allocating pseudo regs into them (when that's possible), | |
813 | go through these unique rtx objects. */ | |
814 | extern rtx stack_pointer_rtx; | |
815 | extern rtx frame_pointer_rtx; | |
816 | extern rtx arg_pointer_rtx; | |
817 | extern rtx pic_offset_table_rtx; | |
818 | extern rtx struct_value_rtx; | |
819 | extern rtx struct_value_incoming_rtx; | |
820 | extern rtx static_chain_rtx; | |
821 | extern rtx static_chain_incoming_rtx; | |
822 | ||
823 | /* Virtual registers are used during RTL generation to refer to locations into | |
824 | the stack frame when the actual location isn't known until RTL generation | |
825 | is complete. The routine instantiate_virtual_regs replaces these with | |
826 | the proper value, which is normally {frame,arg,stack}_pointer_rtx plus | |
827 | a constant. */ | |
828 | ||
829 | #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER) | |
830 | ||
831 | /* This points to the first word of the incoming arguments passed on the stack, | |
832 | either by the caller or by the callee when pretending it was passed by the | |
833 | caller. */ | |
834 | ||
835 | extern rtx virtual_incoming_args_rtx; | |
836 | ||
837 | #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER) | |
838 | ||
839 | /* If FRAME_GROWS_DOWNWARDS, this points to immediately above the first | |
840 | variable on the stack. Otherwise, it points to the first variable on | |
841 | the stack. */ | |
842 | ||
843 | extern rtx virtual_stack_vars_rtx; | |
844 | ||
845 | #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1) | |
846 | ||
847 | /* This points to the location of dynamically-allocated memory on the stack | |
848 | immediately after the stack pointer has been adjusted by the amount | |
849 | desired. */ | |
850 | ||
851 | extern rtx virtual_stack_dynamic_rtx; | |
852 | ||
853 | #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2) | |
854 | ||
855 | /* This points to the location in the stack at which outgoing arguments should | |
856 | be written when the stack is pre-pushed (arguments pushed using push | |
857 | insns always use sp). */ | |
858 | ||
859 | extern rtx virtual_outgoing_args_rtx; | |
860 | ||
861 | #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3) | |
862 | ||
863 | #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 3) | |
864 | ||
865 | extern rtx find_next_ref PROTO((rtx, rtx)); | |
866 | extern rtx *find_single_use PROTO((rtx, rtx, rtx *)); | |
867 | ||
868 | /* It is hard to write the prototype for expand_expr, since it needs | |
869 | expr.h to be included for the enumeration. */ | |
870 | ||
871 | extern rtx expand_expr (); | |
872 | extern rtx immed_real_const_1(); | |
873 | ||
874 | #ifdef TREE_CODE | |
875 | /* rtl.h and tree.h were included. */ | |
876 | extern rtx output_constant_def PROTO((tree)); | |
877 | extern rtx immed_real_const PROTO((tree)); | |
878 | extern rtx immed_real_const_1 PROTO((REAL_VALUE_TYPE, enum machine_mode)); | |
879 | extern tree make_tree PROTO((tree, rtx)); | |
880 | ||
881 | #else | |
882 | extern rtx output_constant_def (); | |
883 | extern rtx immed_real_const (); | |
884 | extern rtx immed_real_const_1 (); | |
885 | #endif | |
886 | ||
887 | /* Define a default value for STORE_FLAG_VALUE. */ | |
888 | ||
889 | #ifndef STORE_FLAG_VALUE | |
890 | #define STORE_FLAG_VALUE 1 | |
891 | #endif | |
892 | ||
893 | /* Nonzero after end of reload pass. | |
894 | Set to 1 or 0 by toplev.c. */ | |
895 | ||
896 | extern int reload_completed; | |
897 | ||
898 | /* Set to 1 while reload_as_needed is operating. | |
899 | Required by some machines to handle any generated moves differently. */ | |
900 | ||
901 | extern int reload_in_progress; | |
902 | ||
903 | /* If this is nonzero, we do not bother generating VOLATILE | |
904 | around volatile memory references, and we are willing to | |
905 | output indirect addresses. If cse is to follow, we reject | |
906 | indirect addresses so a useful potential cse is generated; | |
907 | if it is used only once, instruction combination will produce | |
908 | the same indirect address eventually. */ | |
909 | extern int cse_not_expected; | |
910 | ||
911 | /* Indexed by pseudo register number, gives the rtx for that pseudo. | |
912 | Allocated in parallel with regno_pointer_flag. */ | |
913 | extern rtx *regno_reg_rtx; | |
914 | ||
915 | /* Translates rtx code to tree code, for those codes needed by | |
916 | REAL_ARITHMETIC. */ | |
917 | extern int rtx_to_tree_code (); |