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b4e0cbb5 | 1 | /* Communication between reload.c and reload1.c. |
af841dbd | 2 | Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1997, 1998, |
9dcd6f09 | 3 | 1999, 2000, 2001, 2003, 2004, 2007 Free Software Foundation, Inc. |
b4e0cbb5 | 4 | |
1322177d | 5 | This file is part of GCC. |
b4e0cbb5 | 6 | |
1322177d LB |
7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 9 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 10 | version. |
b4e0cbb5 | 11 | |
1322177d LB |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
b4e0cbb5 RK |
16 | |
17 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
b4e0cbb5 RK |
20 | |
21 | ||
defc614f RK |
22 | /* If secondary reloads are the same for inputs and outputs, define those |
23 | macros here. */ | |
24 | ||
25 | #ifdef SECONDARY_RELOAD_CLASS | |
26 | #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \ | |
27 | SECONDARY_RELOAD_CLASS (CLASS, MODE, X) | |
28 | #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \ | |
29 | SECONDARY_RELOAD_CLASS (CLASS, MODE, X) | |
30 | #endif | |
31 | ||
cbd5b9a2 KR |
32 | /* If MEMORY_MOVE_COST isn't defined, give it a default here. */ |
33 | #ifndef MEMORY_MOVE_COST | |
cbd5b9a2 KR |
34 | #define MEMORY_MOVE_COST(MODE,CLASS,IN) \ |
35 | (4 + memory_move_secondary_cost ((MODE), (CLASS), (IN))) | |
cbd5b9a2 | 36 | #endif |
0c20a65f | 37 | extern int memory_move_secondary_cost (enum machine_mode, enum reg_class, int); |
cbd5b9a2 | 38 | |
b4e0cbb5 RK |
39 | /* Maximum number of reloads we can need. */ |
40 | #define MAX_RELOADS (2 * MAX_RECOG_OPERANDS * (MAX_REGS_PER_ADDRESS + 1)) | |
41 | ||
96c82232 RK |
42 | /* Encode the usage of a reload. The following codes are supported: |
43 | ||
44 | RELOAD_FOR_INPUT reload of an input operand | |
45 | RELOAD_FOR_OUTPUT likewise, for output | |
46 | RELOAD_FOR_INSN a reload that must not conflict with anything | |
47 | used in the insn, but may conflict with | |
48 | something used before or after the insn | |
49 | RELOAD_FOR_INPUT_ADDRESS reload for parts of the address of an object | |
50 | that is an input reload | |
47c8cf91 ILT |
51 | RELOAD_FOR_INPADDR_ADDRESS reload needed for RELOAD_FOR_INPUT_ADDRESS |
52 | RELOAD_FOR_OUTPUT_ADDRESS like RELOAD_FOR INPUT_ADDRESS, for output | |
53 | RELOAD_FOR_OUTADDR_ADDRESS reload needed for RELOAD_FOR_OUTPUT_ADDRESS | |
96c82232 RK |
54 | RELOAD_FOR_OPERAND_ADDRESS reload for the address of a non-reloaded |
55 | operand; these don't conflict with | |
56 | any other addresses. | |
ca8e02b0 RK |
57 | RELOAD_FOR_OPADDR_ADDR reload needed for RELOAD_FOR_OPERAND_ADDRESS |
58 | reloads; usually secondary reloads | |
96c82232 RK |
59 | RELOAD_OTHER none of the above, usually multiple uses |
60 | RELOAD_FOR_OTHER_ADDRESS reload for part of the address of an input | |
0c20a65f | 61 | that is marked RELOAD_OTHER. |
96c82232 RK |
62 | |
63 | This used to be "enum reload_when_needed" but some debuggers have trouble | |
64 | with an enum tag and variable of the same name. */ | |
65 | ||
66 | enum reload_type | |
b4e0cbb5 | 67 | { |
0c20a65f | 68 | RELOAD_FOR_INPUT, RELOAD_FOR_OUTPUT, RELOAD_FOR_INSN, |
47c8cf91 ILT |
69 | RELOAD_FOR_INPUT_ADDRESS, RELOAD_FOR_INPADDR_ADDRESS, |
70 | RELOAD_FOR_OUTPUT_ADDRESS, RELOAD_FOR_OUTADDR_ADDRESS, | |
ca8e02b0 RK |
71 | RELOAD_FOR_OPERAND_ADDRESS, RELOAD_FOR_OPADDR_ADDR, |
72 | RELOAD_OTHER, RELOAD_FOR_OTHER_ADDRESS | |
b4e0cbb5 RK |
73 | }; |
74 | ||
e78d8e51 | 75 | #ifdef GCC_INSN_CODES_H |
eceef4c9 BS |
76 | /* Each reload is recorded with a structure like this. */ |
77 | struct reload | |
78 | { | |
79 | /* The value to reload from */ | |
80 | rtx in; | |
81 | /* Where to store reload-reg afterward if nec (often the same as | |
82 | reload_in) */ | |
83 | rtx out; | |
84 | ||
85 | /* The class of registers to reload into. */ | |
86 | enum reg_class class; | |
87 | ||
88 | /* The mode this operand should have when reloaded, on input. */ | |
89 | enum machine_mode inmode; | |
90 | /* The mode this operand should have when reloaded, on output. */ | |
91 | enum machine_mode outmode; | |
92 | ||
8ec450a4 | 93 | /* The mode of the reload register. */ |
1e875952 | 94 | enum machine_mode mode; |
8ec450a4 BS |
95 | |
96 | /* the largest number of registers this reload will require. */ | |
770ae6cc | 97 | unsigned int nregs; |
8ec450a4 | 98 | |
eceef4c9 BS |
99 | /* Positive amount to increment or decrement by if |
100 | reload_in is a PRE_DEC, PRE_INC, POST_DEC, POST_INC. | |
101 | Ignored otherwise (don't assume it is zero). */ | |
102 | int inc; | |
103 | /* A reg for which reload_in is the equivalent. | |
104 | If reload_in is a symbol_ref which came from | |
105 | reg_equiv_constant, then this is the pseudo | |
106 | which has that symbol_ref as equivalent. */ | |
107 | rtx in_reg; | |
108 | rtx out_reg; | |
109 | ||
110 | /* Used in find_reload_regs to record the allocated register. */ | |
111 | int regno; | |
112 | /* This is the register to reload into. If it is zero when `find_reloads' | |
113 | returns, you must find a suitable register in the class specified by | |
114 | reload_reg_class, and store here an rtx for that register with mode from | |
115 | reload_inmode or reload_outmode. */ | |
116 | rtx reg_rtx; | |
117 | /* The operand number being reloaded. This is used to group related reloads | |
118 | and need not always be equal to the actual operand number in the insn, | |
119 | though it current will be; for in-out operands, it is one of the two | |
120 | operand numbers. */ | |
121 | int opnum; | |
122 | ||
123 | /* Gives the reload number of a secondary input reload, when needed; | |
124 | otherwise -1. */ | |
125 | int secondary_in_reload; | |
126 | /* Gives the reload number of a secondary output reload, when needed; | |
127 | otherwise -1. */ | |
128 | int secondary_out_reload; | |
129 | /* If a secondary input reload is required, gives the INSN_CODE that uses the | |
130 | secondary reload as a scratch register, or CODE_FOR_nothing if the | |
131 | secondary reload register is to be an intermediate register. */ | |
132 | enum insn_code secondary_in_icode; | |
133 | /* Likewise, for a secondary output reload. */ | |
134 | enum insn_code secondary_out_icode; | |
135 | ||
136 | /* Classifies reload as needed either for addressing an input reload, | |
137 | addressing an output, for addressing a non-reloaded mem ref, or for | |
138 | unspecified purposes (i.e., more than one of the above). */ | |
139 | enum reload_type when_needed; | |
0c20a65f | 140 | |
eceef4c9 BS |
141 | /* Nonzero for an optional reload. Optional reloads are ignored unless the |
142 | value is already sitting in a register. */ | |
143 | unsigned int optional:1; | |
144 | /* nonzero if this reload shouldn't be combined with another reload. */ | |
145 | unsigned int nocombine:1; | |
146 | /* Nonzero if this is a secondary register for one or more reloads. */ | |
147 | unsigned int secondary_p:1; | |
148 | /* Nonzero if this reload must use a register not already allocated to a | |
149 | group. */ | |
150 | unsigned int nongroup:1; | |
151 | }; | |
152 | ||
153 | extern struct reload rld[MAX_RELOADS]; | |
154 | extern int n_reloads; | |
155 | #endif | |
b4e0cbb5 | 156 | |
43b373a2 | 157 | extern GTY (()) VEC(rtx,gc) *reg_equiv_memory_loc_vec; |
b4e0cbb5 | 158 | extern rtx *reg_equiv_constant; |
444aea52 | 159 | extern rtx *reg_equiv_invariant; |
af189bf3 | 160 | extern rtx *reg_equiv_memory_loc; |
b4e0cbb5 RK |
161 | extern rtx *reg_equiv_address; |
162 | extern rtx *reg_equiv_mem; | |
3f1e3e70 | 163 | extern rtx *reg_equiv_alt_mem_list; |
b4e0cbb5 | 164 | |
d7f88d86 BS |
165 | /* Element N is the list of insns that initialized reg N from its equivalent |
166 | constant or memory slot. */ | |
167 | extern GTY((length("reg_equiv_init_size"))) rtx *reg_equiv_init; | |
168 | ||
169 | /* The size of the previous array, for GC purposes. */ | |
170 | extern GTY(()) int reg_equiv_init_size; | |
171 | ||
b4e0cbb5 RK |
172 | /* All the "earlyclobber" operands of the current insn |
173 | are recorded here. */ | |
174 | extern int n_earlyclobbers; | |
175 | extern rtx reload_earlyclobbers[MAX_RECOG_OPERANDS]; | |
176 | ||
96c82232 RK |
177 | /* Save the number of operands. */ |
178 | extern int reload_n_operands; | |
179 | ||
b4e0cbb5 RK |
180 | /* First uid used by insns created by reload in this function. |
181 | Used in find_equiv_reg. */ | |
182 | extern int reload_first_uid; | |
183 | ||
98af7219 KH |
184 | /* Nonzero if indirect addressing is supported when the innermost MEM is |
185 | of the form (MEM (SYMBOL_REF sym)). It is assumed that the level to | |
186 | which these are valid is the same as spill_indirect_levels, above. */ | |
187 | ||
188 | extern char indirect_symref_ok; | |
189 | ||
b4e0cbb5 RK |
190 | /* Nonzero if an address (plus (reg frame_pointer) (reg ...)) is valid. */ |
191 | extern char double_reg_address_ok; | |
192 | ||
cb2afeb3 R |
193 | extern int num_not_at_initial_offset; |
194 | ||
cad6f7d0 BS |
195 | #if defined SET_HARD_REG_BIT && defined CLEAR_REG_SET |
196 | /* This structure describes instructions which are relevant for reload. | |
197 | Apart from all regular insns, this also includes CODE_LABELs, since they | |
198 | must be examined for register elimination. */ | |
0c20a65f | 199 | struct insn_chain |
cad6f7d0 | 200 | { |
8d9afc4e | 201 | /* Links to the neighbor instructions. */ |
cad6f7d0 BS |
202 | struct insn_chain *next, *prev; |
203 | ||
204 | /* Link through a chains set up by calculate_needs_all_insns, containing | |
205 | all insns that need reloading. */ | |
206 | struct insn_chain *next_need_reload; | |
207 | ||
208 | /* The basic block this insn is in. */ | |
209 | int block; | |
210 | /* The rtx of the insn. */ | |
211 | rtx insn; | |
212 | /* Register life information: record all live hard registers, and all | |
285f3cf0 | 213 | live pseudos that have a hard register. */ |
239a0f5b BS |
214 | regset_head live_throughout; |
215 | regset_head dead_or_set; | |
cad6f7d0 | 216 | |
f5d8c9f4 BS |
217 | /* Copies of the global variables computed by find_reloads. */ |
218 | struct reload *rld; | |
219 | int n_reloads; | |
cad6f7d0 BS |
220 | |
221 | /* Indicates which registers have already been used for spills. */ | |
222 | HARD_REG_SET used_spill_regs; | |
223 | ||
cad6f7d0 BS |
224 | /* Nonzero if find_reloads said the insn requires reloading. */ |
225 | unsigned int need_reload:1; | |
03acd8f8 BS |
226 | /* Nonzero if find_reloads needs to be run during reload_as_needed to |
227 | perform modifications on any operands. */ | |
228 | unsigned int need_operand_change:1; | |
cad6f7d0 BS |
229 | /* Nonzero if eliminate_regs_in_insn said it requires eliminations. */ |
230 | unsigned int need_elim:1; | |
231 | /* Nonzero if this insn was inserted by perform_caller_saves. */ | |
232 | unsigned int is_caller_save_insn:1; | |
233 | }; | |
234 | ||
235 | /* A chain of insn_chain structures to describe all non-note insns in | |
236 | a function. */ | |
237 | extern struct insn_chain *reload_insn_chain; | |
238 | ||
239 | /* Allocate a new insn_chain structure. */ | |
0c20a65f | 240 | extern struct insn_chain *new_insn_chain (void); |
cad6f7d0 | 241 | |
0c20a65f | 242 | extern void compute_use_by_pseudos (HARD_REG_SET *, regset); |
cad6f7d0 BS |
243 | #endif |
244 | ||
96c82232 RK |
245 | /* Functions from reload.c: */ |
246 | ||
8a99f6f9 R |
247 | extern enum reg_class secondary_reload_class (bool, enum reg_class, |
248 | enum machine_mode, rtx); | |
249 | ||
250 | #ifdef GCC_INSN_CODES_H | |
251 | extern enum reg_class scratch_reload_class (enum insn_code); | |
252 | #endif | |
253 | ||
0c20a65f | 254 | /* Return a memory location that will be used to copy X in mode MODE. |
96c82232 RK |
255 | If we haven't already made a location for this mode in this insn, |
256 | call find_reloads_address on the location being returned. */ | |
0c20a65f | 257 | extern rtx get_secondary_mem (rtx, enum machine_mode, int, enum reload_type); |
96c82232 RK |
258 | |
259 | /* Clear any secondary memory locations we've made. */ | |
0c20a65f | 260 | extern void clear_secondary_mem (void); |
96c82232 RK |
261 | |
262 | /* Transfer all replacements that used to be in reload FROM to be in | |
263 | reload TO. */ | |
0c20a65f | 264 | extern void transfer_replacements (int, int); |
96c82232 | 265 | |
cb2afeb3 R |
266 | /* IN_RTX is the value loaded by a reload that we now decided to inherit, |
267 | or a subpart of it. If we have any replacements registered for IN_RTX, | |
3d042e77 KH |
268 | cancel the reloads that were supposed to load them. |
269 | Return nonzero if we canceled any reloads. */ | |
0c20a65f | 270 | extern int remove_address_replacements (rtx in_rtx); |
029b38ff | 271 | |
96c82232 RK |
272 | /* Like rtx_equal_p except that it allows a REG and a SUBREG to match |
273 | if they are the same hard reg, and has special hacks for | |
274 | autoincrement and autodecrement. */ | |
0c20a65f | 275 | extern int operands_match_p (rtx, rtx); |
96c82232 | 276 | |
2ba84f36 | 277 | /* Return 1 if altering OP will not modify the value of CLOBBER. */ |
0c20a65f | 278 | extern int safe_from_earlyclobber (rtx, rtx); |
96c82232 RK |
279 | |
280 | /* Search the body of INSN for values that need reloading and record them | |
281 | with push_reload. REPLACE nonzero means record also where the values occur | |
97ecb251 | 282 | so that subst_reloads can be used. */ |
0c20a65f | 283 | extern int find_reloads (rtx, int, int, int, short *); |
96c82232 RK |
284 | |
285 | /* Compute the sum of X and Y, making canonicalizations assumed in an | |
286 | address, namely: sum constant integers, surround the sum of two | |
287 | constants with a CONST, put the constant as the second operand, and | |
288 | group the constant on the outermost sum. */ | |
0c20a65f | 289 | extern rtx form_sum (rtx, rtx); |
96c82232 RK |
290 | |
291 | /* Substitute into the current INSN the registers into which we have reloaded | |
292 | the things that need reloading. */ | |
0c20a65f | 293 | extern void subst_reloads (rtx); |
96c82232 RK |
294 | |
295 | /* Make a copy of any replacements being done into X and move those copies | |
296 | to locations in Y, a copy of X. We only look at the highest level of | |
297 | the RTL. */ | |
0c20a65f | 298 | extern void copy_replacements (rtx, rtx); |
96c82232 | 299 | |
a9a2595b | 300 | /* Change any replacements being done to *X to be done to *Y */ |
0c20a65f | 301 | extern void move_replacements (rtx *x, rtx *y); |
a9a2595b | 302 | |
96c82232 RK |
303 | /* If LOC was scheduled to be replaced by something, return the replacement. |
304 | Otherwise, return *LOC. */ | |
0c20a65f | 305 | extern rtx find_replacement (rtx *); |
96c82232 | 306 | |
96c82232 | 307 | /* Nonzero if modifying X will affect IN. */ |
0c20a65f | 308 | extern int reg_overlap_mentioned_for_reload_p (rtx, rtx); |
96c82232 | 309 | |
96c82232 RK |
310 | /* Check the insns before INSN to see if there is a suitable register |
311 | containing the same value as GOAL. */ | |
0c20a65f AJ |
312 | extern rtx find_equiv_reg (rtx, rtx, enum reg_class, int, short *, |
313 | int, enum machine_mode); | |
96c82232 RK |
314 | |
315 | /* Return 1 if register REGNO is the subject of a clobber in insn INSN. */ | |
0c20a65f | 316 | extern int regno_clobbered_p (unsigned int, rtx, enum machine_mode, int); |
96c82232 | 317 | |
09a308fe | 318 | /* Return 1 if X is an operand of an insn that is being earlyclobbered. */ |
0c20a65f | 319 | extern int earlyclobber_operand_p (rtx); |
aead1ca3 RH |
320 | |
321 | /* Record one reload that needs to be performed. */ | |
0c20a65f AJ |
322 | extern int push_reload (rtx, rtx, rtx *, rtx *, enum reg_class, |
323 | enum machine_mode, enum machine_mode, | |
324 | int, int, int, enum reload_type); | |
09a308fe | 325 | |
15e35479 | 326 | /* Functions in postreload.c: */ |
0c20a65f | 327 | extern void reload_cse_regs (rtx); |
15e35479 KH |
328 | |
329 | /* Functions in reload1.c: */ | |
d6f4ec51 | 330 | |
96c82232 | 331 | /* Initialize the reload pass once per compilation. */ |
0c20a65f | 332 | extern void init_reload (void); |
96c82232 RK |
333 | |
334 | /* The reload pass itself. */ | |
0c20a65f | 335 | extern int reload (rtx, int); |
96c82232 RK |
336 | |
337 | /* Mark the slots in regs_ever_live for the hard regs | |
338 | used by pseudo-reg number REGNO. */ | |
0c20a65f | 339 | extern void mark_home_live (int); |
96c82232 RK |
340 | |
341 | /* Scan X and replace any eliminable registers (such as fp) with a | |
342 | replacement (such as sp), plus an offset. */ | |
0c20a65f | 343 | extern rtx eliminate_regs (rtx, enum machine_mode, rtx); |
8c74fb06 | 344 | extern bool elimination_target_reg_p (rtx); |
96c82232 | 345 | |
cb2afeb3 | 346 | /* Deallocate the reload register used by reload number R. */ |
0c20a65f | 347 | extern void deallocate_reload_reg (int r); |
cb2afeb3 | 348 | |
96c82232 RK |
349 | /* Functions in caller-save.c: */ |
350 | ||
351 | /* Initialize for caller-save. */ | |
0c20a65f | 352 | extern void init_caller_save (void); |
96c82232 RK |
353 | |
354 | /* Initialize save areas by showing that we haven't allocated any yet. */ | |
0c20a65f | 355 | extern void init_save_areas (void); |
96c82232 RK |
356 | |
357 | /* Allocate save areas for any hard registers that might need saving. */ | |
0c20a65f | 358 | extern void setup_save_areas (void); |
96c82232 RK |
359 | |
360 | /* Find the places where hard regs are live across calls and save them. */ | |
0c20a65f | 361 | extern void save_call_clobbered_regs (void); |
0304f787 JL |
362 | |
363 | /* Replace (subreg (reg)) with the appropriate (reg) for any operands. */ | |
0c20a65f | 364 | extern void cleanup_subreg_operands (rtx); |
e04ca094 JL |
365 | |
366 | /* Debugging support. */ | |
0c20a65f AJ |
367 | extern void debug_reload_to_stream (FILE *); |
368 | extern void debug_reload (void); | |
f12448c8 AO |
369 | |
370 | /* Compute the actual register we should reload to, in case we're | |
371 | reloading to/from a register that is wider than a word. */ | |
0c20a65f | 372 | extern rtx reload_adjust_reg_for_mode (rtx, enum machine_mode); |