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Commit | Line | Data |
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18ca7dab | 1 | /* Subroutines for manipulating rtx's in semantically interesting ways. |
ef58a523 | 2 | Copyright (C) 1987, 1991, 1994, 1995, 1996, 1997, 1998, |
88462c42 | 3 | 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
18ca7dab | 4 | |
1322177d | 5 | This file is part of GCC. |
18ca7dab | 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 | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
18ca7dab | 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. | |
18ca7dab RK |
16 | |
17 | You should have received a copy of the GNU General Public License | |
1322177d LB |
18 | along with GCC; see the file COPYING. If not, write to the Free |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
18ca7dab RK |
21 | |
22 | ||
23 | #include "config.h" | |
670ee920 | 24 | #include "system.h" |
4977bab6 ZW |
25 | #include "coretypes.h" |
26 | #include "tm.h" | |
01198c2f | 27 | #include "toplev.h" |
18ca7dab RK |
28 | #include "rtl.h" |
29 | #include "tree.h" | |
6baf1cc8 | 30 | #include "tm_p.h" |
18ca7dab | 31 | #include "flags.h" |
49ad7cfa | 32 | #include "function.h" |
18ca7dab | 33 | #include "expr.h" |
e78d8e51 | 34 | #include "optabs.h" |
18ca7dab RK |
35 | #include "hard-reg-set.h" |
36 | #include "insn-config.h" | |
1d974ca7 | 37 | #include "ggc.h" |
18ca7dab | 38 | #include "recog.h" |
a77a9a18 | 39 | #include "langhooks.h" |
18ca7dab | 40 | |
502b8322 AJ |
41 | static rtx break_out_memory_refs (rtx); |
42 | static void emit_stack_probe (rtx); | |
7e4ce834 RH |
43 | |
44 | ||
45 | /* Truncate and perhaps sign-extend C as appropriate for MODE. */ | |
46 | ||
47 | HOST_WIDE_INT | |
502b8322 | 48 | trunc_int_for_mode (HOST_WIDE_INT c, enum machine_mode mode) |
7e4ce834 RH |
49 | { |
50 | int width = GET_MODE_BITSIZE (mode); | |
51 | ||
71012d97 GK |
52 | /* You want to truncate to a _what_? */ |
53 | if (! SCALAR_INT_MODE_P (mode)) | |
54 | abort (); | |
55 | ||
1f3f36d1 RH |
56 | /* Canonicalize BImode to 0 and STORE_FLAG_VALUE. */ |
57 | if (mode == BImode) | |
58 | return c & 1 ? STORE_FLAG_VALUE : 0; | |
59 | ||
5b0d91c3 AO |
60 | /* Sign-extend for the requested mode. */ |
61 | ||
62 | if (width < HOST_BITS_PER_WIDE_INT) | |
63 | { | |
64 | HOST_WIDE_INT sign = 1; | |
65 | sign <<= width - 1; | |
66 | c &= (sign << 1) - 1; | |
67 | c ^= sign; | |
68 | c -= sign; | |
69 | } | |
7e4ce834 RH |
70 | |
71 | return c; | |
72 | } | |
73 | ||
b1ec3c92 CH |
74 | /* Return an rtx for the sum of X and the integer C. |
75 | ||
8008b228 | 76 | This function should be used via the `plus_constant' macro. */ |
18ca7dab RK |
77 | |
78 | rtx | |
502b8322 | 79 | plus_constant_wide (rtx x, HOST_WIDE_INT c) |
18ca7dab | 80 | { |
b3694847 | 81 | RTX_CODE code; |
17ab7c59 | 82 | rtx y; |
b3694847 SS |
83 | enum machine_mode mode; |
84 | rtx tem; | |
18ca7dab RK |
85 | int all_constant = 0; |
86 | ||
87 | if (c == 0) | |
88 | return x; | |
89 | ||
90 | restart: | |
91 | ||
92 | code = GET_CODE (x); | |
93 | mode = GET_MODE (x); | |
17ab7c59 RK |
94 | y = x; |
95 | ||
18ca7dab RK |
96 | switch (code) |
97 | { | |
98 | case CONST_INT: | |
b1ec3c92 | 99 | return GEN_INT (INTVAL (x) + c); |
18ca7dab RK |
100 | |
101 | case CONST_DOUBLE: | |
102 | { | |
f9e158c3 | 103 | unsigned HOST_WIDE_INT l1 = CONST_DOUBLE_LOW (x); |
b1ec3c92 | 104 | HOST_WIDE_INT h1 = CONST_DOUBLE_HIGH (x); |
f9e158c3 | 105 | unsigned HOST_WIDE_INT l2 = c; |
b1ec3c92 | 106 | HOST_WIDE_INT h2 = c < 0 ? ~0 : 0; |
f9e158c3 JM |
107 | unsigned HOST_WIDE_INT lv; |
108 | HOST_WIDE_INT hv; | |
18ca7dab RK |
109 | |
110 | add_double (l1, h1, l2, h2, &lv, &hv); | |
111 | ||
112 | return immed_double_const (lv, hv, VOIDmode); | |
113 | } | |
114 | ||
115 | case MEM: | |
116 | /* If this is a reference to the constant pool, try replacing it with | |
117 | a reference to a new constant. If the resulting address isn't | |
118 | valid, don't return it because we have no way to validize it. */ | |
119 | if (GET_CODE (XEXP (x, 0)) == SYMBOL_REF | |
120 | && CONSTANT_POOL_ADDRESS_P (XEXP (x, 0))) | |
121 | { | |
122 | tem | |
123 | = force_const_mem (GET_MODE (x), | |
124 | plus_constant (get_pool_constant (XEXP (x, 0)), | |
125 | c)); | |
126 | if (memory_address_p (GET_MODE (tem), XEXP (tem, 0))) | |
127 | return tem; | |
128 | } | |
129 | break; | |
130 | ||
131 | case CONST: | |
132 | /* If adding to something entirely constant, set a flag | |
133 | so that we can add a CONST around the result. */ | |
134 | x = XEXP (x, 0); | |
135 | all_constant = 1; | |
136 | goto restart; | |
137 | ||
138 | case SYMBOL_REF: | |
139 | case LABEL_REF: | |
140 | all_constant = 1; | |
141 | break; | |
142 | ||
143 | case PLUS: | |
144 | /* The interesting case is adding the integer to a sum. | |
145 | Look for constant term in the sum and combine | |
146 | with C. For an integer constant term, we make a combined | |
147 | integer. For a constant term that is not an explicit integer, | |
d9b3eb63 | 148 | we cannot really combine, but group them together anyway. |
e5671f2b | 149 | |
03d937fc R |
150 | Restart or use a recursive call in case the remaining operand is |
151 | something that we handle specially, such as a SYMBOL_REF. | |
152 | ||
153 | We may not immediately return from the recursive call here, lest | |
154 | all_constant gets lost. */ | |
e5671f2b RK |
155 | |
156 | if (GET_CODE (XEXP (x, 1)) == CONST_INT) | |
03d937fc R |
157 | { |
158 | c += INTVAL (XEXP (x, 1)); | |
7e4ce834 RH |
159 | |
160 | if (GET_MODE (x) != VOIDmode) | |
161 | c = trunc_int_for_mode (c, GET_MODE (x)); | |
162 | ||
03d937fc R |
163 | x = XEXP (x, 0); |
164 | goto restart; | |
165 | } | |
b72f00af | 166 | else if (CONSTANT_P (XEXP (x, 1))) |
03d937fc | 167 | { |
b72f00af | 168 | x = gen_rtx_PLUS (mode, XEXP (x, 0), plus_constant (XEXP (x, 1), c)); |
03d937fc R |
169 | c = 0; |
170 | } | |
b72f00af | 171 | else if (find_constant_term_loc (&y)) |
03d937fc | 172 | { |
b72f00af RK |
173 | /* We need to be careful since X may be shared and we can't |
174 | modify it in place. */ | |
175 | rtx copy = copy_rtx (x); | |
176 | rtx *const_loc = find_constant_term_loc (©); | |
177 | ||
178 | *const_loc = plus_constant (*const_loc, c); | |
179 | x = copy; | |
03d937fc R |
180 | c = 0; |
181 | } | |
38a448ca | 182 | break; |
ed8908e7 | 183 | |
38a448ca RH |
184 | default: |
185 | break; | |
18ca7dab RK |
186 | } |
187 | ||
188 | if (c != 0) | |
38a448ca | 189 | x = gen_rtx_PLUS (mode, x, GEN_INT (c)); |
18ca7dab RK |
190 | |
191 | if (GET_CODE (x) == SYMBOL_REF || GET_CODE (x) == LABEL_REF) | |
192 | return x; | |
193 | else if (all_constant) | |
38a448ca | 194 | return gen_rtx_CONST (mode, x); |
18ca7dab RK |
195 | else |
196 | return x; | |
197 | } | |
18ca7dab RK |
198 | \f |
199 | /* If X is a sum, return a new sum like X but lacking any constant terms. | |
200 | Add all the removed constant terms into *CONSTPTR. | |
201 | X itself is not altered. The result != X if and only if | |
202 | it is not isomorphic to X. */ | |
203 | ||
204 | rtx | |
502b8322 | 205 | eliminate_constant_term (rtx x, rtx *constptr) |
18ca7dab | 206 | { |
b3694847 | 207 | rtx x0, x1; |
18ca7dab RK |
208 | rtx tem; |
209 | ||
210 | if (GET_CODE (x) != PLUS) | |
211 | return x; | |
212 | ||
213 | /* First handle constants appearing at this level explicitly. */ | |
214 | if (GET_CODE (XEXP (x, 1)) == CONST_INT | |
215 | && 0 != (tem = simplify_binary_operation (PLUS, GET_MODE (x), *constptr, | |
216 | XEXP (x, 1))) | |
217 | && GET_CODE (tem) == CONST_INT) | |
218 | { | |
219 | *constptr = tem; | |
220 | return eliminate_constant_term (XEXP (x, 0), constptr); | |
221 | } | |
222 | ||
223 | tem = const0_rtx; | |
224 | x0 = eliminate_constant_term (XEXP (x, 0), &tem); | |
225 | x1 = eliminate_constant_term (XEXP (x, 1), &tem); | |
226 | if ((x1 != XEXP (x, 1) || x0 != XEXP (x, 0)) | |
227 | && 0 != (tem = simplify_binary_operation (PLUS, GET_MODE (x), | |
228 | *constptr, tem)) | |
229 | && GET_CODE (tem) == CONST_INT) | |
230 | { | |
231 | *constptr = tem; | |
38a448ca | 232 | return gen_rtx_PLUS (GET_MODE (x), x0, x1); |
18ca7dab RK |
233 | } |
234 | ||
235 | return x; | |
236 | } | |
237 | ||
18ca7dab RK |
238 | /* Return an rtx for the size in bytes of the value of EXP. */ |
239 | ||
240 | rtx | |
502b8322 | 241 | expr_size (tree exp) |
18ca7dab | 242 | { |
6fce44af | 243 | tree size = SUBSTITUTE_PLACEHOLDER_IN_EXPR (lang_hooks.expr_size (exp), exp); |
99098c66 | 244 | |
37a08a29 | 245 | return expand_expr (size, NULL_RTX, TYPE_MODE (sizetype), 0); |
18ca7dab | 246 | } |
de8920be JM |
247 | |
248 | /* Return a wide integer for the size in bytes of the value of EXP, or -1 | |
249 | if the size can vary or is larger than an integer. */ | |
250 | ||
251 | HOST_WIDE_INT | |
502b8322 | 252 | int_expr_size (tree exp) |
de8920be | 253 | { |
ae2bcd98 | 254 | tree t = lang_hooks.expr_size (exp); |
de8920be JM |
255 | |
256 | if (t == 0 | |
257 | || TREE_CODE (t) != INTEGER_CST | |
258 | || TREE_OVERFLOW (t) | |
259 | || TREE_INT_CST_HIGH (t) != 0 | |
260 | /* If the result would appear negative, it's too big to represent. */ | |
261 | || (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0) | |
262 | return -1; | |
263 | ||
264 | return TREE_INT_CST_LOW (t); | |
265 | } | |
18ca7dab RK |
266 | \f |
267 | /* Return a copy of X in which all memory references | |
268 | and all constants that involve symbol refs | |
269 | have been replaced with new temporary registers. | |
270 | Also emit code to load the memory locations and constants | |
271 | into those registers. | |
272 | ||
273 | If X contains no such constants or memory references, | |
274 | X itself (not a copy) is returned. | |
275 | ||
276 | If a constant is found in the address that is not a legitimate constant | |
277 | in an insn, it is left alone in the hope that it might be valid in the | |
278 | address. | |
279 | ||
280 | X may contain no arithmetic except addition, subtraction and multiplication. | |
281 | Values returned by expand_expr with 1 for sum_ok fit this constraint. */ | |
282 | ||
283 | static rtx | |
502b8322 | 284 | break_out_memory_refs (rtx x) |
18ca7dab RK |
285 | { |
286 | if (GET_CODE (x) == MEM | |
cabeca29 | 287 | || (CONSTANT_P (x) && CONSTANT_ADDRESS_P (x) |
18ca7dab | 288 | && GET_MODE (x) != VOIDmode)) |
2cca6e3f | 289 | x = force_reg (GET_MODE (x), x); |
18ca7dab RK |
290 | else if (GET_CODE (x) == PLUS || GET_CODE (x) == MINUS |
291 | || GET_CODE (x) == MULT) | |
292 | { | |
b3694847 SS |
293 | rtx op0 = break_out_memory_refs (XEXP (x, 0)); |
294 | rtx op1 = break_out_memory_refs (XEXP (x, 1)); | |
2cca6e3f | 295 | |
18ca7dab | 296 | if (op0 != XEXP (x, 0) || op1 != XEXP (x, 1)) |
38a448ca | 297 | x = gen_rtx_fmt_ee (GET_CODE (x), Pmode, op0, op1); |
18ca7dab | 298 | } |
2cca6e3f | 299 | |
18ca7dab RK |
300 | return x; |
301 | } | |
302 | ||
ea534b63 | 303 | /* Given X, a memory address in ptr_mode, convert it to an address |
498b529f RK |
304 | in Pmode, or vice versa (TO_MODE says which way). We take advantage of |
305 | the fact that pointers are not allowed to overflow by commuting arithmetic | |
306 | operations over conversions so that address arithmetic insns can be | |
307 | used. */ | |
ea534b63 | 308 | |
498b529f | 309 | rtx |
5ae6cd0d MM |
310 | convert_memory_address (enum machine_mode to_mode ATTRIBUTE_UNUSED, |
311 | rtx x) | |
ea534b63 | 312 | { |
5ae6cd0d MM |
313 | #ifndef POINTERS_EXTEND_UNSIGNED |
314 | return x; | |
315 | #else /* defined(POINTERS_EXTEND_UNSIGNED) */ | |
316 | enum machine_mode from_mode; | |
498b529f | 317 | rtx temp; |
aa0f70e6 | 318 | enum rtx_code code; |
498b529f | 319 | |
5ae6cd0d MM |
320 | /* If X already has the right mode, just return it. */ |
321 | if (GET_MODE (x) == to_mode) | |
322 | return x; | |
323 | ||
324 | from_mode = to_mode == ptr_mode ? Pmode : ptr_mode; | |
325 | ||
0b04ec8c RK |
326 | /* Here we handle some special cases. If none of them apply, fall through |
327 | to the default case. */ | |
ea534b63 RK |
328 | switch (GET_CODE (x)) |
329 | { | |
330 | case CONST_INT: | |
331 | case CONST_DOUBLE: | |
aa0f70e6 SE |
332 | if (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (from_mode)) |
333 | code = TRUNCATE; | |
334 | else if (POINTERS_EXTEND_UNSIGNED < 0) | |
335 | break; | |
336 | else if (POINTERS_EXTEND_UNSIGNED > 0) | |
337 | code = ZERO_EXTEND; | |
338 | else | |
339 | code = SIGN_EXTEND; | |
340 | temp = simplify_unary_operation (code, to_mode, x, from_mode); | |
341 | if (temp) | |
342 | return temp; | |
343 | break; | |
498b529f | 344 | |
d1405722 | 345 | case SUBREG: |
5da4f548 | 346 | if ((SUBREG_PROMOTED_VAR_P (x) || REG_POINTER (SUBREG_REG (x))) |
6dd12198 | 347 | && GET_MODE (SUBREG_REG (x)) == to_mode) |
d1405722 RK |
348 | return SUBREG_REG (x); |
349 | break; | |
350 | ||
ea534b63 | 351 | case LABEL_REF: |
5da4f548 SE |
352 | temp = gen_rtx_LABEL_REF (to_mode, XEXP (x, 0)); |
353 | LABEL_REF_NONLOCAL_P (temp) = LABEL_REF_NONLOCAL_P (x); | |
354 | return temp; | |
6dd12198 | 355 | break; |
498b529f | 356 | |
ea534b63 | 357 | case SYMBOL_REF: |
ce02ba25 EC |
358 | temp = shallow_copy_rtx (x); |
359 | PUT_MODE (temp, to_mode); | |
5da4f548 | 360 | return temp; |
6dd12198 | 361 | break; |
ea534b63 | 362 | |
498b529f | 363 | case CONST: |
5da4f548 SE |
364 | return gen_rtx_CONST (to_mode, |
365 | convert_memory_address (to_mode, XEXP (x, 0))); | |
6dd12198 | 366 | break; |
ea534b63 | 367 | |
0b04ec8c RK |
368 | case PLUS: |
369 | case MULT: | |
aa0f70e6 SE |
370 | /* For addition we can safely permute the conversion and addition |
371 | operation if one operand is a constant and converting the constant | |
372 | does not change it. We can always safely permute them if we are | |
373 | making the address narrower. */ | |
374 | if (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (from_mode) | |
375 | || (GET_CODE (x) == PLUS | |
376 | && GET_CODE (XEXP (x, 1)) == CONST_INT | |
377 | && XEXP (x, 1) == convert_memory_address (to_mode, XEXP (x, 1)))) | |
d9b3eb63 | 378 | return gen_rtx_fmt_ee (GET_CODE (x), to_mode, |
38a448ca | 379 | convert_memory_address (to_mode, XEXP (x, 0)), |
aa0f70e6 | 380 | XEXP (x, 1)); |
38a448ca | 381 | break; |
d9b3eb63 | 382 | |
38a448ca RH |
383 | default: |
384 | break; | |
ea534b63 | 385 | } |
0b04ec8c RK |
386 | |
387 | return convert_modes (to_mode, from_mode, | |
388 | x, POINTERS_EXTEND_UNSIGNED); | |
5ae6cd0d | 389 | #endif /* defined(POINTERS_EXTEND_UNSIGNED) */ |
ea534b63 | 390 | } |
ea534b63 | 391 | |
18ca7dab RK |
392 | /* Given a memory address or facsimile X, construct a new address, |
393 | currently equivalent, that is stable: future stores won't change it. | |
394 | ||
395 | X must be composed of constants, register and memory references | |
396 | combined with addition, subtraction and multiplication: | |
397 | in other words, just what you can get from expand_expr if sum_ok is 1. | |
398 | ||
399 | Works by making copies of all regs and memory locations used | |
400 | by X and combining them the same way X does. | |
401 | You could also stabilize the reference to this address | |
402 | by copying the address to a register with copy_to_reg; | |
403 | but then you wouldn't get indexed addressing in the reference. */ | |
404 | ||
405 | rtx | |
502b8322 | 406 | copy_all_regs (rtx x) |
18ca7dab RK |
407 | { |
408 | if (GET_CODE (x) == REG) | |
409 | { | |
11c50c5e DE |
410 | if (REGNO (x) != FRAME_POINTER_REGNUM |
411 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
412 | && REGNO (x) != HARD_FRAME_POINTER_REGNUM | |
413 | #endif | |
414 | ) | |
18ca7dab RK |
415 | x = copy_to_reg (x); |
416 | } | |
417 | else if (GET_CODE (x) == MEM) | |
418 | x = copy_to_reg (x); | |
419 | else if (GET_CODE (x) == PLUS || GET_CODE (x) == MINUS | |
420 | || GET_CODE (x) == MULT) | |
421 | { | |
b3694847 SS |
422 | rtx op0 = copy_all_regs (XEXP (x, 0)); |
423 | rtx op1 = copy_all_regs (XEXP (x, 1)); | |
18ca7dab | 424 | if (op0 != XEXP (x, 0) || op1 != XEXP (x, 1)) |
38a448ca | 425 | x = gen_rtx_fmt_ee (GET_CODE (x), Pmode, op0, op1); |
18ca7dab RK |
426 | } |
427 | return x; | |
428 | } | |
429 | \f | |
430 | /* Return something equivalent to X but valid as a memory address | |
431 | for something of mode MODE. When X is not itself valid, this | |
432 | works by copying X or subexpressions of it into registers. */ | |
433 | ||
434 | rtx | |
502b8322 | 435 | memory_address (enum machine_mode mode, rtx x) |
18ca7dab | 436 | { |
b3694847 | 437 | rtx oldx = x; |
18ca7dab | 438 | |
38a448ca RH |
439 | if (GET_CODE (x) == ADDRESSOF) |
440 | return x; | |
441 | ||
5ae6cd0d | 442 | x = convert_memory_address (Pmode, x); |
ea534b63 | 443 | |
ba228239 | 444 | /* By passing constant addresses through registers |
18ca7dab | 445 | we get a chance to cse them. */ |
cabeca29 | 446 | if (! cse_not_expected && CONSTANT_P (x) && CONSTANT_ADDRESS_P (x)) |
18b9ca6f | 447 | x = force_reg (Pmode, x); |
18ca7dab RK |
448 | |
449 | /* Accept a QUEUED that refers to a REG | |
450 | even though that isn't a valid address. | |
451 | On attempting to put this in an insn we will call protect_from_queue | |
452 | which will turn it into a REG, which is valid. */ | |
18b9ca6f | 453 | else if (GET_CODE (x) == QUEUED |
18ca7dab | 454 | && GET_CODE (QUEUED_VAR (x)) == REG) |
18b9ca6f | 455 | ; |
18ca7dab RK |
456 | |
457 | /* We get better cse by rejecting indirect addressing at this stage. | |
458 | Let the combiner create indirect addresses where appropriate. | |
459 | For now, generate the code so that the subexpressions useful to share | |
460 | are visible. But not if cse won't be done! */ | |
18b9ca6f | 461 | else |
18ca7dab | 462 | { |
18b9ca6f RK |
463 | if (! cse_not_expected && GET_CODE (x) != REG) |
464 | x = break_out_memory_refs (x); | |
465 | ||
466 | /* At this point, any valid address is accepted. */ | |
467 | GO_IF_LEGITIMATE_ADDRESS (mode, x, win); | |
468 | ||
469 | /* If it was valid before but breaking out memory refs invalidated it, | |
470 | use it the old way. */ | |
471 | if (memory_address_p (mode, oldx)) | |
472 | goto win2; | |
473 | ||
474 | /* Perform machine-dependent transformations on X | |
475 | in certain cases. This is not necessary since the code | |
476 | below can handle all possible cases, but machine-dependent | |
477 | transformations can make better code. */ | |
478 | LEGITIMIZE_ADDRESS (x, oldx, mode, win); | |
479 | ||
480 | /* PLUS and MULT can appear in special ways | |
481 | as the result of attempts to make an address usable for indexing. | |
482 | Usually they are dealt with by calling force_operand, below. | |
483 | But a sum containing constant terms is special | |
484 | if removing them makes the sum a valid address: | |
485 | then we generate that address in a register | |
486 | and index off of it. We do this because it often makes | |
487 | shorter code, and because the addresses thus generated | |
488 | in registers often become common subexpressions. */ | |
489 | if (GET_CODE (x) == PLUS) | |
490 | { | |
491 | rtx constant_term = const0_rtx; | |
492 | rtx y = eliminate_constant_term (x, &constant_term); | |
493 | if (constant_term == const0_rtx | |
494 | || ! memory_address_p (mode, y)) | |
495 | x = force_operand (x, NULL_RTX); | |
496 | else | |
497 | { | |
38a448ca | 498 | y = gen_rtx_PLUS (GET_MODE (x), copy_to_reg (y), constant_term); |
18b9ca6f RK |
499 | if (! memory_address_p (mode, y)) |
500 | x = force_operand (x, NULL_RTX); | |
501 | else | |
502 | x = y; | |
503 | } | |
504 | } | |
18ca7dab | 505 | |
e475ed2a | 506 | else if (GET_CODE (x) == MULT || GET_CODE (x) == MINUS) |
18b9ca6f | 507 | x = force_operand (x, NULL_RTX); |
18ca7dab | 508 | |
18b9ca6f RK |
509 | /* If we have a register that's an invalid address, |
510 | it must be a hard reg of the wrong class. Copy it to a pseudo. */ | |
511 | else if (GET_CODE (x) == REG) | |
512 | x = copy_to_reg (x); | |
513 | ||
514 | /* Last resort: copy the value to a register, since | |
515 | the register is a valid address. */ | |
516 | else | |
517 | x = force_reg (Pmode, x); | |
518 | ||
519 | goto done; | |
18ca7dab | 520 | |
c02a7fbb RK |
521 | win2: |
522 | x = oldx; | |
523 | win: | |
524 | if (flag_force_addr && ! cse_not_expected && GET_CODE (x) != REG | |
525 | /* Don't copy an addr via a reg if it is one of our stack slots. */ | |
526 | && ! (GET_CODE (x) == PLUS | |
527 | && (XEXP (x, 0) == virtual_stack_vars_rtx | |
528 | || XEXP (x, 0) == virtual_incoming_args_rtx))) | |
529 | { | |
530 | if (general_operand (x, Pmode)) | |
531 | x = force_reg (Pmode, x); | |
532 | else | |
533 | x = force_operand (x, NULL_RTX); | |
534 | } | |
18ca7dab | 535 | } |
18b9ca6f RK |
536 | |
537 | done: | |
538 | ||
2cca6e3f RK |
539 | /* If we didn't change the address, we are done. Otherwise, mark |
540 | a reg as a pointer if we have REG or REG + CONST_INT. */ | |
541 | if (oldx == x) | |
542 | return x; | |
543 | else if (GET_CODE (x) == REG) | |
bdb429a5 | 544 | mark_reg_pointer (x, BITS_PER_UNIT); |
2cca6e3f RK |
545 | else if (GET_CODE (x) == PLUS |
546 | && GET_CODE (XEXP (x, 0)) == REG | |
547 | && GET_CODE (XEXP (x, 1)) == CONST_INT) | |
bdb429a5 | 548 | mark_reg_pointer (XEXP (x, 0), BITS_PER_UNIT); |
2cca6e3f | 549 | |
18b9ca6f RK |
550 | /* OLDX may have been the address on a temporary. Update the address |
551 | to indicate that X is now used. */ | |
552 | update_temp_slot_address (oldx, x); | |
553 | ||
18ca7dab RK |
554 | return x; |
555 | } | |
556 | ||
557 | /* Like `memory_address' but pretend `flag_force_addr' is 0. */ | |
558 | ||
559 | rtx | |
502b8322 | 560 | memory_address_noforce (enum machine_mode mode, rtx x) |
18ca7dab RK |
561 | { |
562 | int ambient_force_addr = flag_force_addr; | |
563 | rtx val; | |
564 | ||
565 | flag_force_addr = 0; | |
566 | val = memory_address (mode, x); | |
567 | flag_force_addr = ambient_force_addr; | |
568 | return val; | |
569 | } | |
570 | ||
571 | /* Convert a mem ref into one with a valid memory address. | |
572 | Pass through anything else unchanged. */ | |
573 | ||
574 | rtx | |
502b8322 | 575 | validize_mem (rtx ref) |
18ca7dab RK |
576 | { |
577 | if (GET_CODE (ref) != MEM) | |
578 | return ref; | |
792760b9 RK |
579 | if (! (flag_force_addr && CONSTANT_ADDRESS_P (XEXP (ref, 0))) |
580 | && memory_address_p (GET_MODE (ref), XEXP (ref, 0))) | |
18ca7dab | 581 | return ref; |
792760b9 | 582 | |
18ca7dab | 583 | /* Don't alter REF itself, since that is probably a stack slot. */ |
792760b9 | 584 | return replace_equiv_address (ref, XEXP (ref, 0)); |
18ca7dab RK |
585 | } |
586 | \f | |
258a120b JM |
587 | /* Given REF, either a MEM or a REG, and T, either the type of X or |
588 | the expression corresponding to REF, set RTX_UNCHANGING_P if | |
589 | appropriate. */ | |
590 | ||
591 | void | |
502b8322 | 592 | maybe_set_unchanging (rtx ref, tree t) |
258a120b JM |
593 | { |
594 | /* We can set RTX_UNCHANGING_P from TREE_READONLY for decls whose | |
595 | initialization is only executed once, or whose initializer always | |
596 | has the same value. Currently we simplify this to PARM_DECLs in the | |
b0a3412c GN |
597 | first case, and decls with TREE_CONSTANT initializers in the second. |
598 | ||
599 | We cannot do this for non-static aggregates, because of the double | |
600 | writes that can be generated by store_constructor, depending on the | |
601 | contents of the initializer. Yes, this does eliminate a good fraction | |
602 | of the number of uses of RTX_UNCHANGING_P for a language like Ada. | |
603 | It also eliminates a good quantity of bugs. Let this be incentive to | |
6356f892 | 604 | eliminate RTX_UNCHANGING_P entirely in favor of a more reliable |
b0a3412c GN |
605 | solution, perhaps based on alias sets. */ |
606 | ||
258a120b | 607 | if ((TREE_READONLY (t) && DECL_P (t) |
b0a3412c | 608 | && (TREE_STATIC (t) || ! AGGREGATE_TYPE_P (TREE_TYPE (t))) |
258a120b | 609 | && (TREE_CODE (t) == PARM_DECL |
4977bab6 | 610 | || (DECL_INITIAL (t) && TREE_CONSTANT (DECL_INITIAL (t))))) |
258a120b JM |
611 | || TREE_CODE_CLASS (TREE_CODE (t)) == 'c') |
612 | RTX_UNCHANGING_P (ref) = 1; | |
613 | } | |
3bdf5ad1 | 614 | \f |
18ca7dab RK |
615 | /* Return a modified copy of X with its memory address copied |
616 | into a temporary register to protect it from side effects. | |
617 | If X is not a MEM, it is returned unchanged (and not copied). | |
618 | Perhaps even if it is a MEM, if there is no need to change it. */ | |
619 | ||
620 | rtx | |
502b8322 | 621 | stabilize (rtx x) |
18ca7dab | 622 | { |
f1ec5147 RK |
623 | if (GET_CODE (x) != MEM |
624 | || ! rtx_unstable_p (XEXP (x, 0))) | |
18ca7dab | 625 | return x; |
3bdf5ad1 | 626 | |
f1ec5147 RK |
627 | return |
628 | replace_equiv_address (x, force_reg (Pmode, copy_all_regs (XEXP (x, 0)))); | |
18ca7dab RK |
629 | } |
630 | \f | |
631 | /* Copy the value or contents of X to a new temp reg and return that reg. */ | |
632 | ||
633 | rtx | |
502b8322 | 634 | copy_to_reg (rtx x) |
18ca7dab | 635 | { |
b3694847 | 636 | rtx temp = gen_reg_rtx (GET_MODE (x)); |
d9b3eb63 | 637 | |
18ca7dab | 638 | /* If not an operand, must be an address with PLUS and MULT so |
d9b3eb63 | 639 | do the computation. */ |
18ca7dab RK |
640 | if (! general_operand (x, VOIDmode)) |
641 | x = force_operand (x, temp); | |
d9b3eb63 | 642 | |
18ca7dab RK |
643 | if (x != temp) |
644 | emit_move_insn (temp, x); | |
645 | ||
646 | return temp; | |
647 | } | |
648 | ||
649 | /* Like copy_to_reg but always give the new register mode Pmode | |
650 | in case X is a constant. */ | |
651 | ||
652 | rtx | |
502b8322 | 653 | copy_addr_to_reg (rtx x) |
18ca7dab RK |
654 | { |
655 | return copy_to_mode_reg (Pmode, x); | |
656 | } | |
657 | ||
658 | /* Like copy_to_reg but always give the new register mode MODE | |
659 | in case X is a constant. */ | |
660 | ||
661 | rtx | |
502b8322 | 662 | copy_to_mode_reg (enum machine_mode mode, rtx x) |
18ca7dab | 663 | { |
b3694847 | 664 | rtx temp = gen_reg_rtx (mode); |
d9b3eb63 | 665 | |
18ca7dab | 666 | /* If not an operand, must be an address with PLUS and MULT so |
d9b3eb63 | 667 | do the computation. */ |
18ca7dab RK |
668 | if (! general_operand (x, VOIDmode)) |
669 | x = force_operand (x, temp); | |
670 | ||
671 | if (GET_MODE (x) != mode && GET_MODE (x) != VOIDmode) | |
672 | abort (); | |
673 | if (x != temp) | |
674 | emit_move_insn (temp, x); | |
675 | return temp; | |
676 | } | |
677 | ||
678 | /* Load X into a register if it is not already one. | |
679 | Use mode MODE for the register. | |
680 | X should be valid for mode MODE, but it may be a constant which | |
681 | is valid for all integer modes; that's why caller must specify MODE. | |
682 | ||
683 | The caller must not alter the value in the register we return, | |
684 | since we mark it as a "constant" register. */ | |
685 | ||
686 | rtx | |
502b8322 | 687 | force_reg (enum machine_mode mode, rtx x) |
18ca7dab | 688 | { |
b3694847 | 689 | rtx temp, insn, set; |
18ca7dab RK |
690 | |
691 | if (GET_CODE (x) == REG) | |
692 | return x; | |
d9b3eb63 | 693 | |
e3c8ea67 RH |
694 | if (general_operand (x, mode)) |
695 | { | |
696 | temp = gen_reg_rtx (mode); | |
697 | insn = emit_move_insn (temp, x); | |
698 | } | |
699 | else | |
700 | { | |
701 | temp = force_operand (x, NULL_RTX); | |
702 | if (GET_CODE (temp) == REG) | |
703 | insn = get_last_insn (); | |
704 | else | |
705 | { | |
706 | rtx temp2 = gen_reg_rtx (mode); | |
707 | insn = emit_move_insn (temp2, temp); | |
708 | temp = temp2; | |
709 | } | |
710 | } | |
62874575 | 711 | |
18ca7dab | 712 | /* Let optimizers know that TEMP's value never changes |
62874575 RK |
713 | and that X can be substituted for it. Don't get confused |
714 | if INSN set something else (such as a SUBREG of TEMP). */ | |
715 | if (CONSTANT_P (x) | |
716 | && (set = single_set (insn)) != 0 | |
fd7acc30 RS |
717 | && SET_DEST (set) == temp |
718 | && ! rtx_equal_p (x, SET_SRC (set))) | |
3d238248 | 719 | set_unique_reg_note (insn, REG_EQUAL, x); |
e3c8ea67 | 720 | |
4a4f95d9 RH |
721 | /* Let optimizers know that TEMP is a pointer, and if so, the |
722 | known alignment of that pointer. */ | |
723 | { | |
724 | unsigned align = 0; | |
725 | if (GET_CODE (x) == SYMBOL_REF) | |
726 | { | |
727 | align = BITS_PER_UNIT; | |
728 | if (SYMBOL_REF_DECL (x) && DECL_P (SYMBOL_REF_DECL (x))) | |
729 | align = DECL_ALIGN (SYMBOL_REF_DECL (x)); | |
730 | } | |
731 | else if (GET_CODE (x) == LABEL_REF) | |
732 | align = BITS_PER_UNIT; | |
733 | else if (GET_CODE (x) == CONST | |
734 | && GET_CODE (XEXP (x, 0)) == PLUS | |
735 | && GET_CODE (XEXP (XEXP (x, 0), 0)) == SYMBOL_REF | |
736 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT) | |
737 | { | |
738 | rtx s = XEXP (XEXP (x, 0), 0); | |
739 | rtx c = XEXP (XEXP (x, 0), 1); | |
740 | unsigned sa, ca; | |
741 | ||
742 | sa = BITS_PER_UNIT; | |
743 | if (SYMBOL_REF_DECL (s) && DECL_P (SYMBOL_REF_DECL (s))) | |
744 | sa = DECL_ALIGN (SYMBOL_REF_DECL (s)); | |
745 | ||
746 | ca = exact_log2 (INTVAL (c) & -INTVAL (c)) * BITS_PER_UNIT; | |
747 | ||
748 | align = MIN (sa, ca); | |
749 | } | |
750 | ||
751 | if (align) | |
752 | mark_reg_pointer (temp, align); | |
753 | } | |
754 | ||
18ca7dab RK |
755 | return temp; |
756 | } | |
757 | ||
758 | /* If X is a memory ref, copy its contents to a new temp reg and return | |
759 | that reg. Otherwise, return X. */ | |
760 | ||
761 | rtx | |
502b8322 | 762 | force_not_mem (rtx x) |
18ca7dab | 763 | { |
b3694847 | 764 | rtx temp; |
fe3439b0 | 765 | |
18ca7dab RK |
766 | if (GET_CODE (x) != MEM || GET_MODE (x) == BLKmode) |
767 | return x; | |
fe3439b0 | 768 | |
18ca7dab | 769 | temp = gen_reg_rtx (GET_MODE (x)); |
f8ad8d7c ZD |
770 | |
771 | if (MEM_POINTER (x)) | |
772 | REG_POINTER (temp) = 1; | |
773 | ||
18ca7dab RK |
774 | emit_move_insn (temp, x); |
775 | return temp; | |
776 | } | |
777 | ||
778 | /* Copy X to TARGET (if it's nonzero and a reg) | |
779 | or to a new temp reg and return that reg. | |
780 | MODE is the mode to use for X in case it is a constant. */ | |
781 | ||
782 | rtx | |
502b8322 | 783 | copy_to_suggested_reg (rtx x, rtx target, enum machine_mode mode) |
18ca7dab | 784 | { |
b3694847 | 785 | rtx temp; |
18ca7dab RK |
786 | |
787 | if (target && GET_CODE (target) == REG) | |
788 | temp = target; | |
789 | else | |
790 | temp = gen_reg_rtx (mode); | |
791 | ||
792 | emit_move_insn (temp, x); | |
793 | return temp; | |
794 | } | |
795 | \f | |
9ff65789 RK |
796 | /* Return the mode to use to store a scalar of TYPE and MODE. |
797 | PUNSIGNEDP points to the signedness of the type and may be adjusted | |
798 | to show what signedness to use on extension operations. | |
799 | ||
cc2902df | 800 | FOR_CALL is nonzero if this call is promoting args for a call. */ |
9ff65789 | 801 | |
d4453b7a | 802 | #if defined(PROMOTE_MODE) && !defined(PROMOTE_FUNCTION_MODE) |
f07e9f0f | 803 | #define PROMOTE_FUNCTION_MODE PROMOTE_MODE |
d4453b7a PB |
804 | #endif |
805 | ||
9ff65789 | 806 | enum machine_mode |
502b8322 AJ |
807 | promote_mode (tree type, enum machine_mode mode, int *punsignedp, |
808 | int for_call ATTRIBUTE_UNUSED) | |
9ff65789 RK |
809 | { |
810 | enum tree_code code = TREE_CODE (type); | |
811 | int unsignedp = *punsignedp; | |
812 | ||
d4453b7a | 813 | #ifndef PROMOTE_MODE |
9ff65789 RK |
814 | if (! for_call) |
815 | return mode; | |
816 | #endif | |
817 | ||
818 | switch (code) | |
819 | { | |
d4453b7a | 820 | #ifdef PROMOTE_FUNCTION_MODE |
9ff65789 RK |
821 | case INTEGER_TYPE: case ENUMERAL_TYPE: case BOOLEAN_TYPE: |
822 | case CHAR_TYPE: case REAL_TYPE: case OFFSET_TYPE: | |
d4453b7a PB |
823 | #ifdef PROMOTE_MODE |
824 | if (for_call) | |
825 | { | |
826 | #endif | |
827 | PROMOTE_FUNCTION_MODE (mode, unsignedp, type); | |
828 | #ifdef PROMOTE_MODE | |
829 | } | |
830 | else | |
831 | { | |
832 | PROMOTE_MODE (mode, unsignedp, type); | |
833 | } | |
834 | #endif | |
9ff65789 RK |
835 | break; |
836 | #endif | |
837 | ||
ea534b63 | 838 | #ifdef POINTERS_EXTEND_UNSIGNED |
56a4c9e2 | 839 | case REFERENCE_TYPE: |
9ff65789 | 840 | case POINTER_TYPE: |
ea534b63 RK |
841 | mode = Pmode; |
842 | unsignedp = POINTERS_EXTEND_UNSIGNED; | |
9ff65789 | 843 | break; |
ea534b63 | 844 | #endif |
d9b3eb63 | 845 | |
38a448ca RH |
846 | default: |
847 | break; | |
9ff65789 RK |
848 | } |
849 | ||
850 | *punsignedp = unsignedp; | |
851 | return mode; | |
852 | } | |
853 | \f | |
18ca7dab RK |
854 | /* Adjust the stack pointer by ADJUST (an rtx for a number of bytes). |
855 | This pops when ADJUST is positive. ADJUST need not be constant. */ | |
856 | ||
857 | void | |
502b8322 | 858 | adjust_stack (rtx adjust) |
18ca7dab RK |
859 | { |
860 | rtx temp; | |
861 | adjust = protect_from_queue (adjust, 0); | |
862 | ||
863 | if (adjust == const0_rtx) | |
864 | return; | |
865 | ||
1503a7ec JH |
866 | /* We expect all variable sized adjustments to be multiple of |
867 | PREFERRED_STACK_BOUNDARY. */ | |
868 | if (GET_CODE (adjust) == CONST_INT) | |
869 | stack_pointer_delta -= INTVAL (adjust); | |
870 | ||
18ca7dab RK |
871 | temp = expand_binop (Pmode, |
872 | #ifdef STACK_GROWS_DOWNWARD | |
873 | add_optab, | |
874 | #else | |
875 | sub_optab, | |
876 | #endif | |
877 | stack_pointer_rtx, adjust, stack_pointer_rtx, 0, | |
878 | OPTAB_LIB_WIDEN); | |
879 | ||
880 | if (temp != stack_pointer_rtx) | |
881 | emit_move_insn (stack_pointer_rtx, temp); | |
882 | } | |
883 | ||
884 | /* Adjust the stack pointer by minus ADJUST (an rtx for a number of bytes). | |
885 | This pushes when ADJUST is positive. ADJUST need not be constant. */ | |
886 | ||
887 | void | |
502b8322 | 888 | anti_adjust_stack (rtx adjust) |
18ca7dab RK |
889 | { |
890 | rtx temp; | |
891 | adjust = protect_from_queue (adjust, 0); | |
892 | ||
893 | if (adjust == const0_rtx) | |
894 | return; | |
895 | ||
1503a7ec JH |
896 | /* We expect all variable sized adjustments to be multiple of |
897 | PREFERRED_STACK_BOUNDARY. */ | |
898 | if (GET_CODE (adjust) == CONST_INT) | |
899 | stack_pointer_delta += INTVAL (adjust); | |
900 | ||
18ca7dab RK |
901 | temp = expand_binop (Pmode, |
902 | #ifdef STACK_GROWS_DOWNWARD | |
903 | sub_optab, | |
904 | #else | |
905 | add_optab, | |
906 | #endif | |
907 | stack_pointer_rtx, adjust, stack_pointer_rtx, 0, | |
908 | OPTAB_LIB_WIDEN); | |
909 | ||
910 | if (temp != stack_pointer_rtx) | |
911 | emit_move_insn (stack_pointer_rtx, temp); | |
912 | } | |
913 | ||
914 | /* Round the size of a block to be pushed up to the boundary required | |
915 | by this machine. SIZE is the desired size, which need not be constant. */ | |
916 | ||
917 | rtx | |
502b8322 | 918 | round_push (rtx size) |
18ca7dab | 919 | { |
c795bca9 | 920 | int align = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT; |
41ee3204 | 921 | |
18ca7dab RK |
922 | if (align == 1) |
923 | return size; | |
41ee3204 | 924 | |
18ca7dab RK |
925 | if (GET_CODE (size) == CONST_INT) |
926 | { | |
41ee3204 OH |
927 | HOST_WIDE_INT new = (INTVAL (size) + align - 1) / align * align; |
928 | ||
18ca7dab | 929 | if (INTVAL (size) != new) |
b1ec3c92 | 930 | size = GEN_INT (new); |
18ca7dab RK |
931 | } |
932 | else | |
933 | { | |
5244db05 | 934 | /* CEIL_DIV_EXPR needs to worry about the addition overflowing, |
0f41302f MS |
935 | but we know it can't. So add ourselves and then do |
936 | TRUNC_DIV_EXPR. */ | |
5244db05 RK |
937 | size = expand_binop (Pmode, add_optab, size, GEN_INT (align - 1), |
938 | NULL_RTX, 1, OPTAB_LIB_WIDEN); | |
939 | size = expand_divmod (0, TRUNC_DIV_EXPR, Pmode, size, GEN_INT (align), | |
b1ec3c92 CH |
940 | NULL_RTX, 1); |
941 | size = expand_mult (Pmode, size, GEN_INT (align), NULL_RTX, 1); | |
18ca7dab | 942 | } |
41ee3204 | 943 | |
18ca7dab RK |
944 | return size; |
945 | } | |
946 | \f | |
59257ff7 RK |
947 | /* Save the stack pointer for the purpose in SAVE_LEVEL. PSAVE is a pointer |
948 | to a previously-created save area. If no save area has been allocated, | |
949 | this function will allocate one. If a save area is specified, it | |
950 | must be of the proper mode. | |
951 | ||
952 | The insns are emitted after insn AFTER, if nonzero, otherwise the insns | |
953 | are emitted at the current position. */ | |
954 | ||
955 | void | |
502b8322 | 956 | emit_stack_save (enum save_level save_level, rtx *psave, rtx after) |
59257ff7 RK |
957 | { |
958 | rtx sa = *psave; | |
959 | /* The default is that we use a move insn and save in a Pmode object. */ | |
502b8322 | 960 | rtx (*fcn) (rtx, rtx) = gen_move_insn; |
a260abc9 | 961 | enum machine_mode mode = STACK_SAVEAREA_MODE (save_level); |
59257ff7 RK |
962 | |
963 | /* See if this machine has anything special to do for this kind of save. */ | |
964 | switch (save_level) | |
965 | { | |
966 | #ifdef HAVE_save_stack_block | |
967 | case SAVE_BLOCK: | |
968 | if (HAVE_save_stack_block) | |
a260abc9 | 969 | fcn = gen_save_stack_block; |
59257ff7 RK |
970 | break; |
971 | #endif | |
972 | #ifdef HAVE_save_stack_function | |
973 | case SAVE_FUNCTION: | |
974 | if (HAVE_save_stack_function) | |
a260abc9 | 975 | fcn = gen_save_stack_function; |
59257ff7 RK |
976 | break; |
977 | #endif | |
978 | #ifdef HAVE_save_stack_nonlocal | |
979 | case SAVE_NONLOCAL: | |
980 | if (HAVE_save_stack_nonlocal) | |
a260abc9 | 981 | fcn = gen_save_stack_nonlocal; |
59257ff7 RK |
982 | break; |
983 | #endif | |
38a448ca RH |
984 | default: |
985 | break; | |
59257ff7 RK |
986 | } |
987 | ||
988 | /* If there is no save area and we have to allocate one, do so. Otherwise | |
989 | verify the save area is the proper mode. */ | |
990 | ||
991 | if (sa == 0) | |
992 | { | |
993 | if (mode != VOIDmode) | |
994 | { | |
995 | if (save_level == SAVE_NONLOCAL) | |
996 | *psave = sa = assign_stack_local (mode, GET_MODE_SIZE (mode), 0); | |
997 | else | |
998 | *psave = sa = gen_reg_rtx (mode); | |
999 | } | |
1000 | } | |
59257ff7 RK |
1001 | |
1002 | if (after) | |
700f6f98 RK |
1003 | { |
1004 | rtx seq; | |
1005 | ||
1006 | start_sequence (); | |
5460015d JW |
1007 | /* We must validize inside the sequence, to ensure that any instructions |
1008 | created by the validize call also get moved to the right place. */ | |
1009 | if (sa != 0) | |
1010 | sa = validize_mem (sa); | |
d072107f | 1011 | emit_insn (fcn (sa, stack_pointer_rtx)); |
2f937369 | 1012 | seq = get_insns (); |
700f6f98 RK |
1013 | end_sequence (); |
1014 | emit_insn_after (seq, after); | |
1015 | } | |
59257ff7 | 1016 | else |
5460015d JW |
1017 | { |
1018 | if (sa != 0) | |
1019 | sa = validize_mem (sa); | |
1020 | emit_insn (fcn (sa, stack_pointer_rtx)); | |
1021 | } | |
59257ff7 RK |
1022 | } |
1023 | ||
1024 | /* Restore the stack pointer for the purpose in SAVE_LEVEL. SA is the save | |
d9b3eb63 | 1025 | area made by emit_stack_save. If it is zero, we have nothing to do. |
59257ff7 | 1026 | |
d9b3eb63 | 1027 | Put any emitted insns after insn AFTER, if nonzero, otherwise at |
59257ff7 RK |
1028 | current position. */ |
1029 | ||
1030 | void | |
502b8322 | 1031 | emit_stack_restore (enum save_level save_level, rtx sa, rtx after) |
59257ff7 RK |
1032 | { |
1033 | /* The default is that we use a move insn. */ | |
502b8322 | 1034 | rtx (*fcn) (rtx, rtx) = gen_move_insn; |
59257ff7 RK |
1035 | |
1036 | /* See if this machine has anything special to do for this kind of save. */ | |
1037 | switch (save_level) | |
1038 | { | |
1039 | #ifdef HAVE_restore_stack_block | |
1040 | case SAVE_BLOCK: | |
1041 | if (HAVE_restore_stack_block) | |
1042 | fcn = gen_restore_stack_block; | |
1043 | break; | |
1044 | #endif | |
1045 | #ifdef HAVE_restore_stack_function | |
1046 | case SAVE_FUNCTION: | |
1047 | if (HAVE_restore_stack_function) | |
1048 | fcn = gen_restore_stack_function; | |
1049 | break; | |
1050 | #endif | |
1051 | #ifdef HAVE_restore_stack_nonlocal | |
59257ff7 RK |
1052 | case SAVE_NONLOCAL: |
1053 | if (HAVE_restore_stack_nonlocal) | |
1054 | fcn = gen_restore_stack_nonlocal; | |
1055 | break; | |
1056 | #endif | |
38a448ca RH |
1057 | default: |
1058 | break; | |
59257ff7 RK |
1059 | } |
1060 | ||
d072107f | 1061 | if (sa != 0) |
260f91c2 DJ |
1062 | { |
1063 | sa = validize_mem (sa); | |
1064 | /* These clobbers prevent the scheduler from moving | |
1065 | references to variable arrays below the code | |
4b7e68e7 | 1066 | that deletes (pops) the arrays. */ |
260f91c2 | 1067 | emit_insn (gen_rtx_CLOBBER (VOIDmode, |
502b8322 | 1068 | gen_rtx_MEM (BLKmode, |
260f91c2 DJ |
1069 | gen_rtx_SCRATCH (VOIDmode)))); |
1070 | emit_insn (gen_rtx_CLOBBER (VOIDmode, | |
1071 | gen_rtx_MEM (BLKmode, stack_pointer_rtx))); | |
1072 | } | |
d072107f | 1073 | |
59257ff7 | 1074 | if (after) |
700f6f98 RK |
1075 | { |
1076 | rtx seq; | |
1077 | ||
1078 | start_sequence (); | |
d072107f | 1079 | emit_insn (fcn (stack_pointer_rtx, sa)); |
2f937369 | 1080 | seq = get_insns (); |
700f6f98 RK |
1081 | end_sequence (); |
1082 | emit_insn_after (seq, after); | |
1083 | } | |
59257ff7 | 1084 | else |
d072107f | 1085 | emit_insn (fcn (stack_pointer_rtx, sa)); |
59257ff7 | 1086 | } |
6de9cd9a DN |
1087 | |
1088 | /* Invoke emit_stack_save on the nonlocal_goto_save_area for the current | |
1089 | function. This function should be called whenever we allocate or | |
1090 | deallocate dynamic stack space. */ | |
1091 | ||
1092 | void | |
1093 | update_nonlocal_goto_save_area (void) | |
1094 | { | |
1095 | tree t_save; | |
1096 | rtx r_save; | |
1097 | ||
1098 | /* The nonlocal_goto_save_area object is an array of N pointers. The | |
1099 | first one is used for the frame pointer save; the rest are sized by | |
1100 | STACK_SAVEAREA_MODE. Create a reference to array index 1, the first | |
1101 | of the stack save area slots. */ | |
1102 | t_save = build (ARRAY_REF, ptr_type_node, cfun->nonlocal_goto_save_area, | |
1103 | integer_one_node); | |
1104 | r_save = expand_expr (t_save, NULL_RTX, VOIDmode, EXPAND_WRITE); | |
1105 | ||
1106 | emit_stack_save (SAVE_NONLOCAL, &r_save, NULL_RTX); | |
1107 | } | |
59257ff7 | 1108 | \f |
c9ec4f99 DM |
1109 | #ifdef SETJMP_VIA_SAVE_AREA |
1110 | /* Optimize RTL generated by allocate_dynamic_stack_space for targets | |
1111 | where SETJMP_VIA_SAVE_AREA is true. The problem is that on these | |
1112 | platforms, the dynamic stack space used can corrupt the original | |
1113 | frame, thus causing a crash if a longjmp unwinds to it. */ | |
1114 | ||
1115 | void | |
502b8322 | 1116 | optimize_save_area_alloca (rtx insns) |
c9ec4f99 DM |
1117 | { |
1118 | rtx insn; | |
1119 | ||
1120 | for (insn = insns; insn; insn = NEXT_INSN(insn)) | |
1121 | { | |
1122 | rtx note; | |
1123 | ||
1124 | if (GET_CODE (insn) != INSN) | |
1125 | continue; | |
1126 | ||
1127 | for (note = REG_NOTES (insn); note; note = XEXP (note, 1)) | |
1128 | { | |
1129 | if (REG_NOTE_KIND (note) != REG_SAVE_AREA) | |
1130 | continue; | |
1131 | ||
1132 | if (!current_function_calls_setjmp) | |
1133 | { | |
1134 | rtx pat = PATTERN (insn); | |
1135 | ||
1136 | /* If we do not see the note in a pattern matching | |
1137 | these precise characteristics, we did something | |
d9b3eb63 | 1138 | entirely wrong in allocate_dynamic_stack_space. |
c9ec4f99 | 1139 | |
38e01259 | 1140 | Note, one way this could happen is if SETJMP_VIA_SAVE_AREA |
c9ec4f99 DM |
1141 | was defined on a machine where stacks grow towards higher |
1142 | addresses. | |
1143 | ||
1144 | Right now only supported port with stack that grow upward | |
1145 | is the HPPA and it does not define SETJMP_VIA_SAVE_AREA. */ | |
1146 | if (GET_CODE (pat) != SET | |
1147 | || SET_DEST (pat) != stack_pointer_rtx | |
1148 | || GET_CODE (SET_SRC (pat)) != MINUS | |
1149 | || XEXP (SET_SRC (pat), 0) != stack_pointer_rtx) | |
1150 | abort (); | |
1151 | ||
1152 | /* This will now be transformed into a (set REG REG) | |
1153 | so we can just blow away all the other notes. */ | |
1154 | XEXP (SET_SRC (pat), 1) = XEXP (note, 0); | |
1155 | REG_NOTES (insn) = NULL_RTX; | |
1156 | } | |
1157 | else | |
1158 | { | |
1159 | /* setjmp was called, we must remove the REG_SAVE_AREA | |
1160 | note so that later passes do not get confused by its | |
1161 | presence. */ | |
1162 | if (note == REG_NOTES (insn)) | |
1163 | { | |
1164 | REG_NOTES (insn) = XEXP (note, 1); | |
1165 | } | |
1166 | else | |
1167 | { | |
1168 | rtx srch; | |
1169 | ||
1170 | for (srch = REG_NOTES (insn); srch; srch = XEXP (srch, 1)) | |
1171 | if (XEXP (srch, 1) == note) | |
1172 | break; | |
1173 | ||
1174 | if (srch == NULL_RTX) | |
c4f2c499 | 1175 | abort (); |
c9ec4f99 DM |
1176 | |
1177 | XEXP (srch, 1) = XEXP (note, 1); | |
1178 | } | |
1179 | } | |
1180 | /* Once we've seen the note of interest, we need not look at | |
1181 | the rest of them. */ | |
1182 | break; | |
1183 | } | |
1184 | } | |
1185 | } | |
1186 | #endif /* SETJMP_VIA_SAVE_AREA */ | |
1187 | ||
18ca7dab RK |
1188 | /* Return an rtx representing the address of an area of memory dynamically |
1189 | pushed on the stack. This region of memory is always aligned to | |
1190 | a multiple of BIGGEST_ALIGNMENT. | |
1191 | ||
1192 | Any required stack pointer alignment is preserved. | |
1193 | ||
1194 | SIZE is an rtx representing the size of the area. | |
091ad0b9 RK |
1195 | TARGET is a place in which the address can be placed. |
1196 | ||
1197 | KNOWN_ALIGN is the alignment (in bits) that we know SIZE has. */ | |
18ca7dab RK |
1198 | |
1199 | rtx | |
502b8322 | 1200 | allocate_dynamic_stack_space (rtx size, rtx target, int known_align) |
18ca7dab | 1201 | { |
c9ec4f99 DM |
1202 | #ifdef SETJMP_VIA_SAVE_AREA |
1203 | rtx setjmpless_size = NULL_RTX; | |
1204 | #endif | |
1205 | ||
15fc0026 | 1206 | /* If we're asking for zero bytes, it doesn't matter what we point |
9faa82d8 | 1207 | to since we can't dereference it. But return a reasonable |
15fc0026 RK |
1208 | address anyway. */ |
1209 | if (size == const0_rtx) | |
1210 | return virtual_stack_dynamic_rtx; | |
1211 | ||
1212 | /* Otherwise, show we're calling alloca or equivalent. */ | |
1213 | current_function_calls_alloca = 1; | |
1214 | ||
18ca7dab RK |
1215 | /* Ensure the size is in the proper mode. */ |
1216 | if (GET_MODE (size) != VOIDmode && GET_MODE (size) != Pmode) | |
1217 | size = convert_to_mode (Pmode, size, 1); | |
1218 | ||
c2f8b491 JH |
1219 | /* We can't attempt to minimize alignment necessary, because we don't |
1220 | know the final value of preferred_stack_boundary yet while executing | |
1221 | this code. */ | |
c2f8b491 | 1222 | cfun->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; |
c2f8b491 | 1223 | |
18ca7dab RK |
1224 | /* We will need to ensure that the address we return is aligned to |
1225 | BIGGEST_ALIGNMENT. If STACK_DYNAMIC_OFFSET is defined, we don't | |
d9b3eb63 | 1226 | always know its final value at this point in the compilation (it |
18ca7dab RK |
1227 | might depend on the size of the outgoing parameter lists, for |
1228 | example), so we must align the value to be returned in that case. | |
cc2902df | 1229 | (Note that STACK_DYNAMIC_OFFSET will have a default nonzero value if |
18ca7dab RK |
1230 | STACK_POINTER_OFFSET or ACCUMULATE_OUTGOING_ARGS are defined). |
1231 | We must also do an alignment operation on the returned value if | |
1232 | the stack pointer alignment is less strict that BIGGEST_ALIGNMENT. | |
1233 | ||
1234 | If we have to align, we must leave space in SIZE for the hole | |
1235 | that might result from the alignment operation. */ | |
1236 | ||
31cdd499 | 1237 | #if defined (STACK_DYNAMIC_OFFSET) || defined (STACK_POINTER_OFFSET) |
515a7242 JW |
1238 | #define MUST_ALIGN 1 |
1239 | #else | |
c795bca9 | 1240 | #define MUST_ALIGN (PREFERRED_STACK_BOUNDARY < BIGGEST_ALIGNMENT) |
18ca7dab RK |
1241 | #endif |
1242 | ||
515a7242 | 1243 | if (MUST_ALIGN) |
d5457140 | 1244 | size |
d9b3eb63 | 1245 | = force_operand (plus_constant (size, |
d5457140 RK |
1246 | BIGGEST_ALIGNMENT / BITS_PER_UNIT - 1), |
1247 | NULL_RTX); | |
1d9d04f8 | 1248 | |
18ca7dab RK |
1249 | #ifdef SETJMP_VIA_SAVE_AREA |
1250 | /* If setjmp restores regs from a save area in the stack frame, | |
1251 | avoid clobbering the reg save area. Note that the offset of | |
1252 | virtual_incoming_args_rtx includes the preallocated stack args space. | |
1253 | It would be no problem to clobber that, but it's on the wrong side | |
1254 | of the old save area. */ | |
1255 | { | |
1256 | rtx dynamic_offset | |
1257 | = expand_binop (Pmode, sub_optab, virtual_stack_dynamic_rtx, | |
b1ec3c92 | 1258 | stack_pointer_rtx, NULL_RTX, 1, OPTAB_LIB_WIDEN); |
c9ec4f99 DM |
1259 | |
1260 | if (!current_function_calls_setjmp) | |
1261 | { | |
c795bca9 | 1262 | int align = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT; |
c9ec4f99 DM |
1263 | |
1264 | /* See optimize_save_area_alloca to understand what is being | |
1265 | set up here. */ | |
1266 | ||
31cdd499 ZW |
1267 | /* ??? Code below assumes that the save area needs maximal |
1268 | alignment. This constraint may be too strong. */ | |
1269 | if (PREFERRED_STACK_BOUNDARY != BIGGEST_ALIGNMENT) | |
1270 | abort (); | |
c9ec4f99 DM |
1271 | |
1272 | if (GET_CODE (size) == CONST_INT) | |
1273 | { | |
d5457140 | 1274 | HOST_WIDE_INT new = INTVAL (size) / align * align; |
c9ec4f99 DM |
1275 | |
1276 | if (INTVAL (size) != new) | |
1277 | setjmpless_size = GEN_INT (new); | |
1278 | else | |
1279 | setjmpless_size = size; | |
1280 | } | |
1281 | else | |
1282 | { | |
1283 | /* Since we know overflow is not possible, we avoid using | |
1284 | CEIL_DIV_EXPR and use TRUNC_DIV_EXPR instead. */ | |
1285 | setjmpless_size = expand_divmod (0, TRUNC_DIV_EXPR, Pmode, size, | |
1286 | GEN_INT (align), NULL_RTX, 1); | |
1287 | setjmpless_size = expand_mult (Pmode, setjmpless_size, | |
1288 | GEN_INT (align), NULL_RTX, 1); | |
1289 | } | |
1290 | /* Our optimization works based upon being able to perform a simple | |
1291 | transformation of this RTL into a (set REG REG) so make sure things | |
1292 | did in fact end up in a REG. */ | |
ee5332b8 | 1293 | if (!register_operand (setjmpless_size, Pmode)) |
c9ec4f99 DM |
1294 | setjmpless_size = force_reg (Pmode, setjmpless_size); |
1295 | } | |
1296 | ||
18ca7dab | 1297 | size = expand_binop (Pmode, add_optab, size, dynamic_offset, |
b1ec3c92 | 1298 | NULL_RTX, 1, OPTAB_LIB_WIDEN); |
18ca7dab RK |
1299 | } |
1300 | #endif /* SETJMP_VIA_SAVE_AREA */ | |
1301 | ||
1302 | /* Round the size to a multiple of the required stack alignment. | |
1303 | Since the stack if presumed to be rounded before this allocation, | |
1304 | this will maintain the required alignment. | |
1305 | ||
1306 | If the stack grows downward, we could save an insn by subtracting | |
1307 | SIZE from the stack pointer and then aligning the stack pointer. | |
1308 | The problem with this is that the stack pointer may be unaligned | |
1309 | between the execution of the subtraction and alignment insns and | |
1310 | some machines do not allow this. Even on those that do, some | |
1311 | signal handlers malfunction if a signal should occur between those | |
1312 | insns. Since this is an extremely rare event, we have no reliable | |
1313 | way of knowing which systems have this problem. So we avoid even | |
1314 | momentarily mis-aligning the stack. */ | |
1315 | ||
86b25e81 RS |
1316 | /* If we added a variable amount to SIZE, |
1317 | we can no longer assume it is aligned. */ | |
515a7242 | 1318 | #if !defined (SETJMP_VIA_SAVE_AREA) |
c795bca9 | 1319 | if (MUST_ALIGN || known_align % PREFERRED_STACK_BOUNDARY != 0) |
34c9156a | 1320 | #endif |
091ad0b9 | 1321 | size = round_push (size); |
18ca7dab RK |
1322 | |
1323 | do_pending_stack_adjust (); | |
1324 | ||
1503a7ec | 1325 | /* We ought to be called always on the toplevel and stack ought to be aligned |
a1f300c0 | 1326 | properly. */ |
1503a7ec JH |
1327 | if (stack_pointer_delta % (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT)) |
1328 | abort (); | |
1503a7ec | 1329 | |
edff2491 RK |
1330 | /* If needed, check that we have the required amount of stack. Take into |
1331 | account what has already been checked. */ | |
1332 | if (flag_stack_check && ! STACK_CHECK_BUILTIN) | |
1333 | probe_stack_range (STACK_CHECK_MAX_FRAME_SIZE + STACK_CHECK_PROTECT, size); | |
1334 | ||
d5457140 | 1335 | /* Don't use a TARGET that isn't a pseudo or is the wrong mode. */ |
091ad0b9 | 1336 | if (target == 0 || GET_CODE (target) != REG |
d5457140 RK |
1337 | || REGNO (target) < FIRST_PSEUDO_REGISTER |
1338 | || GET_MODE (target) != Pmode) | |
18ca7dab RK |
1339 | target = gen_reg_rtx (Pmode); |
1340 | ||
bdb429a5 | 1341 | mark_reg_pointer (target, known_align); |
3ad69266 | 1342 | |
18ca7dab RK |
1343 | /* Perform the required allocation from the stack. Some systems do |
1344 | this differently than simply incrementing/decrementing from the | |
38a448ca | 1345 | stack pointer, such as acquiring the space by calling malloc(). */ |
18ca7dab RK |
1346 | #ifdef HAVE_allocate_stack |
1347 | if (HAVE_allocate_stack) | |
1348 | { | |
39403d82 | 1349 | enum machine_mode mode = STACK_SIZE_MODE; |
a995e389 | 1350 | insn_operand_predicate_fn pred; |
39403d82 | 1351 | |
4b6c1672 RK |
1352 | /* We don't have to check against the predicate for operand 0 since |
1353 | TARGET is known to be a pseudo of the proper mode, which must | |
1354 | be valid for the operand. For operand 1, convert to the | |
1355 | proper mode and validate. */ | |
c5c76735 | 1356 | if (mode == VOIDmode) |
4b6c1672 | 1357 | mode = insn_data[(int) CODE_FOR_allocate_stack].operand[1].mode; |
c5c76735 | 1358 | |
a995e389 RH |
1359 | pred = insn_data[(int) CODE_FOR_allocate_stack].operand[1].predicate; |
1360 | if (pred && ! ((*pred) (size, mode))) | |
05d482b9 | 1361 | size = copy_to_mode_reg (mode, convert_to_mode (mode, size, 1)); |
18ca7dab | 1362 | |
38a448ca | 1363 | emit_insn (gen_allocate_stack (target, size)); |
18ca7dab RK |
1364 | } |
1365 | else | |
1366 | #endif | |
ea534b63 | 1367 | { |
38a448ca RH |
1368 | #ifndef STACK_GROWS_DOWNWARD |
1369 | emit_move_insn (target, virtual_stack_dynamic_rtx); | |
1370 | #endif | |
a157febd GK |
1371 | |
1372 | /* Check stack bounds if necessary. */ | |
1373 | if (current_function_limit_stack) | |
1374 | { | |
1375 | rtx available; | |
1376 | rtx space_available = gen_label_rtx (); | |
1377 | #ifdef STACK_GROWS_DOWNWARD | |
d9b3eb63 | 1378 | available = expand_binop (Pmode, sub_optab, |
a157febd GK |
1379 | stack_pointer_rtx, stack_limit_rtx, |
1380 | NULL_RTX, 1, OPTAB_WIDEN); | |
1381 | #else | |
d9b3eb63 | 1382 | available = expand_binop (Pmode, sub_optab, |
a157febd GK |
1383 | stack_limit_rtx, stack_pointer_rtx, |
1384 | NULL_RTX, 1, OPTAB_WIDEN); | |
1385 | #endif | |
1386 | emit_cmp_and_jump_insns (available, size, GEU, NULL_RTX, Pmode, 1, | |
a06ef755 | 1387 | space_available); |
a157febd GK |
1388 | #ifdef HAVE_trap |
1389 | if (HAVE_trap) | |
1390 | emit_insn (gen_trap ()); | |
1391 | else | |
1392 | #endif | |
1393 | error ("stack limits not supported on this target"); | |
1394 | emit_barrier (); | |
1395 | emit_label (space_available); | |
1396 | } | |
1397 | ||
ea534b63 | 1398 | anti_adjust_stack (size); |
c9ec4f99 DM |
1399 | #ifdef SETJMP_VIA_SAVE_AREA |
1400 | if (setjmpless_size != NULL_RTX) | |
1401 | { | |
0fb7aeda | 1402 | rtx note_target = get_last_insn (); |
c9ec4f99 | 1403 | |
9e6a5703 JC |
1404 | REG_NOTES (note_target) |
1405 | = gen_rtx_EXPR_LIST (REG_SAVE_AREA, setjmpless_size, | |
1406 | REG_NOTES (note_target)); | |
c9ec4f99 DM |
1407 | } |
1408 | #endif /* SETJMP_VIA_SAVE_AREA */ | |
d5457140 | 1409 | |
18ca7dab | 1410 | #ifdef STACK_GROWS_DOWNWARD |
ca56cd30 | 1411 | emit_move_insn (target, virtual_stack_dynamic_rtx); |
18ca7dab | 1412 | #endif |
38a448ca | 1413 | } |
18ca7dab | 1414 | |
515a7242 | 1415 | if (MUST_ALIGN) |
091ad0b9 | 1416 | { |
5244db05 | 1417 | /* CEIL_DIV_EXPR needs to worry about the addition overflowing, |
0f41302f MS |
1418 | but we know it can't. So add ourselves and then do |
1419 | TRUNC_DIV_EXPR. */ | |
0f56a403 | 1420 | target = expand_binop (Pmode, add_optab, target, |
5244db05 RK |
1421 | GEN_INT (BIGGEST_ALIGNMENT / BITS_PER_UNIT - 1), |
1422 | NULL_RTX, 1, OPTAB_LIB_WIDEN); | |
1423 | target = expand_divmod (0, TRUNC_DIV_EXPR, Pmode, target, | |
b1ec3c92 CH |
1424 | GEN_INT (BIGGEST_ALIGNMENT / BITS_PER_UNIT), |
1425 | NULL_RTX, 1); | |
091ad0b9 | 1426 | target = expand_mult (Pmode, target, |
b1ec3c92 CH |
1427 | GEN_INT (BIGGEST_ALIGNMENT / BITS_PER_UNIT), |
1428 | NULL_RTX, 1); | |
091ad0b9 | 1429 | } |
d9b3eb63 | 1430 | |
15fc0026 | 1431 | /* Record the new stack level for nonlocal gotos. */ |
6de9cd9a DN |
1432 | if (cfun->nonlocal_goto_save_area != 0) |
1433 | update_nonlocal_goto_save_area (); | |
15fc0026 | 1434 | |
18ca7dab RK |
1435 | return target; |
1436 | } | |
1437 | \f | |
d9b3eb63 | 1438 | /* A front end may want to override GCC's stack checking by providing a |
14a774a9 RK |
1439 | run-time routine to call to check the stack, so provide a mechanism for |
1440 | calling that routine. */ | |
1441 | ||
e2500fed | 1442 | static GTY(()) rtx stack_check_libfunc; |
14a774a9 RK |
1443 | |
1444 | void | |
502b8322 | 1445 | set_stack_check_libfunc (rtx libfunc) |
14a774a9 RK |
1446 | { |
1447 | stack_check_libfunc = libfunc; | |
1448 | } | |
1449 | \f | |
edff2491 RK |
1450 | /* Emit one stack probe at ADDRESS, an address within the stack. */ |
1451 | ||
1452 | static void | |
502b8322 | 1453 | emit_stack_probe (rtx address) |
edff2491 | 1454 | { |
38a448ca | 1455 | rtx memref = gen_rtx_MEM (word_mode, address); |
edff2491 RK |
1456 | |
1457 | MEM_VOLATILE_P (memref) = 1; | |
1458 | ||
1459 | if (STACK_CHECK_PROBE_LOAD) | |
1460 | emit_move_insn (gen_reg_rtx (word_mode), memref); | |
1461 | else | |
1462 | emit_move_insn (memref, const0_rtx); | |
1463 | } | |
1464 | ||
d9b3eb63 | 1465 | /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive. |
edff2491 RK |
1466 | FIRST is a constant and size is a Pmode RTX. These are offsets from the |
1467 | current stack pointer. STACK_GROWS_DOWNWARD says whether to add or | |
1468 | subtract from the stack. If SIZE is constant, this is done | |
1469 | with a fixed number of probes. Otherwise, we must make a loop. */ | |
1470 | ||
1471 | #ifdef STACK_GROWS_DOWNWARD | |
1472 | #define STACK_GROW_OP MINUS | |
1473 | #else | |
1474 | #define STACK_GROW_OP PLUS | |
1475 | #endif | |
1476 | ||
1477 | void | |
502b8322 | 1478 | probe_stack_range (HOST_WIDE_INT first, rtx size) |
edff2491 | 1479 | { |
4b6c1672 RK |
1480 | /* First ensure SIZE is Pmode. */ |
1481 | if (GET_MODE (size) != VOIDmode && GET_MODE (size) != Pmode) | |
1482 | size = convert_to_mode (Pmode, size, 1); | |
1483 | ||
1484 | /* Next see if the front end has set up a function for us to call to | |
14a774a9 RK |
1485 | check the stack. */ |
1486 | if (stack_check_libfunc != 0) | |
f5f5363f RK |
1487 | { |
1488 | rtx addr = memory_address (QImode, | |
2b3aadfc RH |
1489 | gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, |
1490 | stack_pointer_rtx, | |
1491 | plus_constant (size, first))); | |
f5f5363f | 1492 | |
5ae6cd0d | 1493 | addr = convert_memory_address (ptr_mode, addr); |
1258ee80 | 1494 | emit_library_call (stack_check_libfunc, LCT_NORMAL, VOIDmode, 1, addr, |
f5f5363f RK |
1495 | ptr_mode); |
1496 | } | |
14a774a9 RK |
1497 | |
1498 | /* Next see if we have an insn to check the stack. Use it if so. */ | |
edff2491 | 1499 | #ifdef HAVE_check_stack |
14a774a9 | 1500 | else if (HAVE_check_stack) |
edff2491 | 1501 | { |
a995e389 | 1502 | insn_operand_predicate_fn pred; |
38a448ca | 1503 | rtx last_addr |
2b3aadfc RH |
1504 | = force_operand (gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, |
1505 | stack_pointer_rtx, | |
1506 | plus_constant (size, first)), | |
38a448ca | 1507 | NULL_RTX); |
edff2491 | 1508 | |
a995e389 RH |
1509 | pred = insn_data[(int) CODE_FOR_check_stack].operand[0].predicate; |
1510 | if (pred && ! ((*pred) (last_addr, Pmode))) | |
c5c76735 | 1511 | last_addr = copy_to_mode_reg (Pmode, last_addr); |
edff2491 | 1512 | |
c5c76735 | 1513 | emit_insn (gen_check_stack (last_addr)); |
edff2491 RK |
1514 | } |
1515 | #endif | |
1516 | ||
1517 | /* If we have to generate explicit probes, see if we have a constant | |
95a086b1 | 1518 | small number of them to generate. If so, that's the easy case. */ |
14a774a9 RK |
1519 | else if (GET_CODE (size) == CONST_INT |
1520 | && INTVAL (size) < 10 * STACK_CHECK_PROBE_INTERVAL) | |
edff2491 RK |
1521 | { |
1522 | HOST_WIDE_INT offset; | |
1523 | ||
1524 | /* Start probing at FIRST + N * STACK_CHECK_PROBE_INTERVAL | |
1525 | for values of N from 1 until it exceeds LAST. If only one | |
1526 | probe is needed, this will not generate any code. Then probe | |
1527 | at LAST. */ | |
1528 | for (offset = first + STACK_CHECK_PROBE_INTERVAL; | |
1529 | offset < INTVAL (size); | |
1530 | offset = offset + STACK_CHECK_PROBE_INTERVAL) | |
38a448ca RH |
1531 | emit_stack_probe (gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, |
1532 | stack_pointer_rtx, | |
1533 | GEN_INT (offset))); | |
edff2491 | 1534 | |
38a448ca RH |
1535 | emit_stack_probe (gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, |
1536 | stack_pointer_rtx, | |
1537 | plus_constant (size, first))); | |
edff2491 RK |
1538 | } |
1539 | ||
1540 | /* In the variable case, do the same as above, but in a loop. We emit loop | |
1541 | notes so that loop optimization can be done. */ | |
1542 | else | |
1543 | { | |
1544 | rtx test_addr | |
38a448ca RH |
1545 | = force_operand (gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, |
1546 | stack_pointer_rtx, | |
1547 | GEN_INT (first + STACK_CHECK_PROBE_INTERVAL)), | |
edff2491 RK |
1548 | NULL_RTX); |
1549 | rtx last_addr | |
38a448ca RH |
1550 | = force_operand (gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, |
1551 | stack_pointer_rtx, | |
1552 | plus_constant (size, first)), | |
edff2491 RK |
1553 | NULL_RTX); |
1554 | rtx incr = GEN_INT (STACK_CHECK_PROBE_INTERVAL); | |
1555 | rtx loop_lab = gen_label_rtx (); | |
1556 | rtx test_lab = gen_label_rtx (); | |
1557 | rtx end_lab = gen_label_rtx (); | |
1558 | rtx temp; | |
1559 | ||
1560 | if (GET_CODE (test_addr) != REG | |
1561 | || REGNO (test_addr) < FIRST_PSEUDO_REGISTER) | |
1562 | test_addr = force_reg (Pmode, test_addr); | |
1563 | ||
edff2491 RK |
1564 | emit_jump (test_lab); |
1565 | ||
1566 | emit_label (loop_lab); | |
1567 | emit_stack_probe (test_addr); | |
1568 | ||
edff2491 RK |
1569 | #ifdef STACK_GROWS_DOWNWARD |
1570 | #define CMP_OPCODE GTU | |
1571 | temp = expand_binop (Pmode, sub_optab, test_addr, incr, test_addr, | |
1572 | 1, OPTAB_WIDEN); | |
1573 | #else | |
1574 | #define CMP_OPCODE LTU | |
1575 | temp = expand_binop (Pmode, add_optab, test_addr, incr, test_addr, | |
1576 | 1, OPTAB_WIDEN); | |
1577 | #endif | |
1578 | ||
1579 | if (temp != test_addr) | |
1580 | abort (); | |
1581 | ||
1582 | emit_label (test_lab); | |
c5d5d461 | 1583 | emit_cmp_and_jump_insns (test_addr, last_addr, CMP_OPCODE, |
a06ef755 | 1584 | NULL_RTX, Pmode, 1, loop_lab); |
edff2491 | 1585 | emit_jump (end_lab); |
edff2491 RK |
1586 | emit_label (end_lab); |
1587 | ||
1588 | emit_stack_probe (last_addr); | |
1589 | } | |
1590 | } | |
1591 | \f | |
18ca7dab RK |
1592 | /* Return an rtx representing the register or memory location |
1593 | in which a scalar value of data type VALTYPE | |
1594 | was returned by a function call to function FUNC. | |
1595 | FUNC is a FUNCTION_DECL node if the precise function is known, | |
4dc07bd7 JJ |
1596 | otherwise 0. |
1597 | OUTGOING is 1 if on a machine with register windows this function | |
1598 | should return the register in which the function will put its result | |
30f7a378 | 1599 | and 0 otherwise. */ |
18ca7dab RK |
1600 | |
1601 | rtx | |
502b8322 AJ |
1602 | hard_function_value (tree valtype, tree func ATTRIBUTE_UNUSED, |
1603 | int outgoing ATTRIBUTE_UNUSED) | |
18ca7dab | 1604 | { |
4dc07bd7 | 1605 | rtx val; |
770ae6cc | 1606 | |
4dc07bd7 JJ |
1607 | #ifdef FUNCTION_OUTGOING_VALUE |
1608 | if (outgoing) | |
1609 | val = FUNCTION_OUTGOING_VALUE (valtype, func); | |
1610 | else | |
1611 | #endif | |
1612 | val = FUNCTION_VALUE (valtype, func); | |
770ae6cc | 1613 | |
e1a4071f JL |
1614 | if (GET_CODE (val) == REG |
1615 | && GET_MODE (val) == BLKmode) | |
1616 | { | |
770ae6cc | 1617 | unsigned HOST_WIDE_INT bytes = int_size_in_bytes (valtype); |
e1a4071f | 1618 | enum machine_mode tmpmode; |
770ae6cc | 1619 | |
d9b3eb63 EC |
1620 | /* int_size_in_bytes can return -1. We don't need a check here |
1621 | since the value of bytes will be large enough that no mode | |
1622 | will match and we will abort later in this function. */ | |
1623 | ||
e1a4071f | 1624 | for (tmpmode = GET_CLASS_NARROWEST_MODE (MODE_INT); |
0fb7aeda KH |
1625 | tmpmode != VOIDmode; |
1626 | tmpmode = GET_MODE_WIDER_MODE (tmpmode)) | |
1627 | { | |
1628 | /* Have we found a large enough mode? */ | |
1629 | if (GET_MODE_SIZE (tmpmode) >= bytes) | |
1630 | break; | |
1631 | } | |
e1a4071f JL |
1632 | |
1633 | /* No suitable mode found. */ | |
0c61f541 | 1634 | if (tmpmode == VOIDmode) |
0fb7aeda | 1635 | abort (); |
e1a4071f JL |
1636 | |
1637 | PUT_MODE (val, tmpmode); | |
d9b3eb63 | 1638 | } |
e1a4071f | 1639 | return val; |
18ca7dab RK |
1640 | } |
1641 | ||
1642 | /* Return an rtx representing the register or memory location | |
1643 | in which a scalar value of mode MODE was returned by a library call. */ | |
1644 | ||
1645 | rtx | |
502b8322 | 1646 | hard_libcall_value (enum machine_mode mode) |
18ca7dab RK |
1647 | { |
1648 | return LIBCALL_VALUE (mode); | |
1649 | } | |
0c5e217d RS |
1650 | |
1651 | /* Look up the tree code for a given rtx code | |
1652 | to provide the arithmetic operation for REAL_ARITHMETIC. | |
1653 | The function returns an int because the caller may not know | |
1654 | what `enum tree_code' means. */ | |
1655 | ||
1656 | int | |
502b8322 | 1657 | rtx_to_tree_code (enum rtx_code code) |
0c5e217d RS |
1658 | { |
1659 | enum tree_code tcode; | |
1660 | ||
1661 | switch (code) | |
1662 | { | |
1663 | case PLUS: | |
1664 | tcode = PLUS_EXPR; | |
1665 | break; | |
1666 | case MINUS: | |
1667 | tcode = MINUS_EXPR; | |
1668 | break; | |
1669 | case MULT: | |
1670 | tcode = MULT_EXPR; | |
1671 | break; | |
1672 | case DIV: | |
1673 | tcode = RDIV_EXPR; | |
1674 | break; | |
1675 | case SMIN: | |
1676 | tcode = MIN_EXPR; | |
1677 | break; | |
1678 | case SMAX: | |
1679 | tcode = MAX_EXPR; | |
1680 | break; | |
1681 | default: | |
1682 | tcode = LAST_AND_UNUSED_TREE_CODE; | |
1683 | break; | |
1684 | } | |
1685 | return ((int) tcode); | |
1686 | } | |
e2500fed GK |
1687 | |
1688 | #include "gt-explow.h" |