Mercurial > hg > CbC > CbC_gcc
annotate gcc/explow.c @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 1830386684a0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* Subroutines for manipulating rtx's in semantically interesting ways. |
| 145 | 2 Copyright (C) 1987-2020 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 This file is part of GCC. | |
| 5 | |
| 6 GCC is free software; you can redistribute it and/or modify it under | |
| 7 the terms of the GNU General Public License as published by the Free | |
| 8 Software Foundation; either version 3, or (at your option) any later | |
| 9 version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 | |
| 21 #include "config.h" | |
| 22 #include "system.h" | |
| 23 #include "coretypes.h" | |
| 111 | 24 #include "target.h" |
| 25 #include "function.h" | |
| 0 | 26 #include "rtl.h" |
| 27 #include "tree.h" | |
| 111 | 28 #include "memmodel.h" |
| 0 | 29 #include "tm_p.h" |
| 111 | 30 #include "expmed.h" |
| 31 #include "profile-count.h" | |
| 0 | 32 #include "optabs.h" |
| 111 | 33 #include "emit-rtl.h" |
| 0 | 34 #include "recog.h" |
| 111 | 35 #include "diagnostic-core.h" |
| 36 #include "stor-layout.h" | |
| 37 #include "except.h" | |
| 38 #include "dojump.h" | |
| 39 #include "explow.h" | |
| 40 #include "expr.h" | |
| 145 | 41 #include "stringpool.h" |
| 111 | 42 #include "common/common-target.h" |
| 0 | 43 #include "output.h" |
| 44 | |
| 45 static rtx break_out_memory_refs (rtx); | |
| 111 | 46 static void anti_adjust_stack_and_probe_stack_clash (rtx); |
| 0 | 47 |
| 48 | |
| 49 /* Truncate and perhaps sign-extend C as appropriate for MODE. */ | |
| 50 | |
| 51 HOST_WIDE_INT | |
| 111 | 52 trunc_int_for_mode (HOST_WIDE_INT c, machine_mode mode) |
| 0 | 53 { |
| 111 | 54 /* Not scalar_int_mode because we also allow pointer bound modes. */ |
| 55 scalar_mode smode = as_a <scalar_mode> (mode); | |
| 56 int width = GET_MODE_PRECISION (smode); | |
| 0 | 57 |
| 58 /* You want to truncate to a _what_? */ | |
| 131 | 59 gcc_assert (SCALAR_INT_MODE_P (mode)); |
| 0 | 60 |
| 61 /* Canonicalize BImode to 0 and STORE_FLAG_VALUE. */ | |
| 111 | 62 if (smode == BImode) |
| 0 | 63 return c & 1 ? STORE_FLAG_VALUE : 0; |
| 64 | |
| 65 /* Sign-extend for the requested mode. */ | |
| 66 | |
| 67 if (width < HOST_BITS_PER_WIDE_INT) | |
| 68 { | |
| 69 HOST_WIDE_INT sign = 1; | |
| 70 sign <<= width - 1; | |
| 71 c &= (sign << 1) - 1; | |
| 72 c ^= sign; | |
| 73 c -= sign; | |
| 74 } | |
| 75 | |
| 76 return c; | |
| 77 } | |
| 78 | |
| 131 | 79 /* Likewise for polynomial values, using the sign-extended representation |
| 80 for each individual coefficient. */ | |
| 81 | |
| 82 poly_int64 | |
| 83 trunc_int_for_mode (poly_int64 x, machine_mode mode) | |
| 84 { | |
| 85 for (unsigned int i = 0; i < NUM_POLY_INT_COEFFS; ++i) | |
| 86 x.coeffs[i] = trunc_int_for_mode (x.coeffs[i], mode); | |
| 87 return x; | |
| 88 } | |
| 89 | |
| 111 | 90 /* Return an rtx for the sum of X and the integer C, given that X has |
| 91 mode MODE. INPLACE is true if X can be modified inplace or false | |
| 92 if it must be treated as immutable. */ | |
| 0 | 93 |
| 94 rtx | |
| 131 | 95 plus_constant (machine_mode mode, rtx x, poly_int64 c, bool inplace) |
| 0 | 96 { |
| 97 RTX_CODE code; | |
| 98 rtx y; | |
| 99 rtx tem; | |
| 100 int all_constant = 0; | |
| 101 | |
| 111 | 102 gcc_assert (GET_MODE (x) == VOIDmode || GET_MODE (x) == mode); |
| 103 | |
| 131 | 104 if (known_eq (c, 0)) |
| 0 | 105 return x; |
| 106 | |
| 107 restart: | |
| 108 | |
| 109 code = GET_CODE (x); | |
| 110 y = x; | |
| 111 | |
| 112 switch (code) | |
| 113 { | |
| 111 | 114 CASE_CONST_SCALAR_INT: |
| 115 return immed_wide_int_const (wi::add (rtx_mode_t (x, mode), c), mode); | |
| 0 | 116 case MEM: |
| 117 /* If this is a reference to the constant pool, try replacing it with | |
| 118 a reference to a new constant. If the resulting address isn't | |
| 119 valid, don't return it because we have no way to validize it. */ | |
| 120 if (GET_CODE (XEXP (x, 0)) == SYMBOL_REF | |
| 121 && CONSTANT_POOL_ADDRESS_P (XEXP (x, 0))) | |
| 122 { | |
| 111 | 123 rtx cst = get_pool_constant (XEXP (x, 0)); |
| 124 | |
| 125 if (GET_CODE (cst) == CONST_VECTOR | |
| 126 && GET_MODE_INNER (GET_MODE (cst)) == mode) | |
| 127 { | |
| 128 cst = gen_lowpart (mode, cst); | |
| 129 gcc_assert (cst); | |
| 130 } | |
| 131 if (GET_MODE (cst) == VOIDmode || GET_MODE (cst) == mode) | |
| 132 { | |
| 133 tem = plus_constant (mode, cst, c); | |
| 134 tem = force_const_mem (GET_MODE (x), tem); | |
| 135 /* Targets may disallow some constants in the constant pool, thus | |
| 136 force_const_mem may return NULL_RTX. */ | |
| 137 if (tem && memory_address_p (GET_MODE (tem), XEXP (tem, 0))) | |
| 138 return tem; | |
| 139 } | |
| 0 | 140 } |
| 141 break; | |
| 142 | |
| 143 case CONST: | |
| 144 /* If adding to something entirely constant, set a flag | |
| 145 so that we can add a CONST around the result. */ | |
| 111 | 146 if (inplace && shared_const_p (x)) |
| 147 inplace = false; | |
| 0 | 148 x = XEXP (x, 0); |
| 149 all_constant = 1; | |
| 150 goto restart; | |
| 151 | |
| 152 case SYMBOL_REF: | |
| 153 case LABEL_REF: | |
| 154 all_constant = 1; | |
| 155 break; | |
| 156 | |
| 157 case PLUS: | |
| 111 | 158 /* The interesting case is adding the integer to a sum. Look |
| 159 for constant term in the sum and combine with C. For an | |
| 160 integer constant term or a constant term that is not an | |
| 161 explicit integer, we combine or group them together anyway. | |
| 0 | 162 |
| 163 We may not immediately return from the recursive call here, lest | |
| 164 all_constant gets lost. */ | |
| 165 | |
| 111 | 166 if (CONSTANT_P (XEXP (x, 1))) |
| 0 | 167 { |
| 111 | 168 rtx term = plus_constant (mode, XEXP (x, 1), c, inplace); |
| 169 if (term == const0_rtx) | |
| 170 x = XEXP (x, 0); | |
| 171 else if (inplace) | |
| 172 XEXP (x, 1) = term; | |
| 173 else | |
| 174 x = gen_rtx_PLUS (mode, XEXP (x, 0), term); | |
| 0 | 175 c = 0; |
| 176 } | |
| 111 | 177 else if (rtx *const_loc = find_constant_term_loc (&y)) |
| 0 | 178 { |
| 111 | 179 if (!inplace) |
| 180 { | |
| 181 /* We need to be careful since X may be shared and we can't | |
| 182 modify it in place. */ | |
| 183 x = copy_rtx (x); | |
| 184 const_loc = find_constant_term_loc (&x); | |
| 185 } | |
| 186 *const_loc = plus_constant (mode, *const_loc, c, true); | |
| 0 | 187 c = 0; |
| 188 } | |
| 189 break; | |
| 190 | |
| 191 default: | |
| 131 | 192 if (CONST_POLY_INT_P (x)) |
| 193 return immed_wide_int_const (const_poly_int_value (x) + c, mode); | |
| 0 | 194 break; |
| 195 } | |
| 196 | |
| 131 | 197 if (maybe_ne (c, 0)) |
| 111 | 198 x = gen_rtx_PLUS (mode, x, gen_int_mode (c, mode)); |
| 0 | 199 |
| 200 if (GET_CODE (x) == SYMBOL_REF || GET_CODE (x) == LABEL_REF) | |
| 201 return x; | |
| 202 else if (all_constant) | |
| 203 return gen_rtx_CONST (mode, x); | |
| 204 else | |
| 205 return x; | |
| 206 } | |
| 207 | |
| 208 /* If X is a sum, return a new sum like X but lacking any constant terms. | |
| 209 Add all the removed constant terms into *CONSTPTR. | |
| 210 X itself is not altered. The result != X if and only if | |
| 211 it is not isomorphic to X. */ | |
| 212 | |
| 213 rtx | |
| 214 eliminate_constant_term (rtx x, rtx *constptr) | |
| 215 { | |
| 216 rtx x0, x1; | |
| 217 rtx tem; | |
| 218 | |
| 219 if (GET_CODE (x) != PLUS) | |
| 220 return x; | |
| 221 | |
| 222 /* First handle constants appearing at this level explicitly. */ | |
|
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223 if (CONST_INT_P (XEXP (x, 1)) |
| 131 | 224 && (tem = simplify_binary_operation (PLUS, GET_MODE (x), *constptr, |
| 225 XEXP (x, 1))) != 0 | |
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226 && CONST_INT_P (tem)) |
| 0 | 227 { |
| 228 *constptr = tem; | |
| 229 return eliminate_constant_term (XEXP (x, 0), constptr); | |
| 230 } | |
| 231 | |
| 232 tem = const0_rtx; | |
| 233 x0 = eliminate_constant_term (XEXP (x, 0), &tem); | |
| 234 x1 = eliminate_constant_term (XEXP (x, 1), &tem); | |
| 235 if ((x1 != XEXP (x, 1) || x0 != XEXP (x, 0)) | |
| 131 | 236 && (tem = simplify_binary_operation (PLUS, GET_MODE (x), |
| 237 *constptr, tem)) != 0 | |
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238 && CONST_INT_P (tem)) |
| 0 | 239 { |
| 240 *constptr = tem; | |
| 241 return gen_rtx_PLUS (GET_MODE (x), x0, x1); | |
| 242 } | |
| 243 | |
| 244 return x; | |
| 245 } | |
| 246 | |
| 247 | |
| 248 /* Return a copy of X in which all memory references | |
| 249 and all constants that involve symbol refs | |
| 250 have been replaced with new temporary registers. | |
| 251 Also emit code to load the memory locations and constants | |
| 252 into those registers. | |
| 253 | |
| 254 If X contains no such constants or memory references, | |
| 255 X itself (not a copy) is returned. | |
| 256 | |
| 257 If a constant is found in the address that is not a legitimate constant | |
| 258 in an insn, it is left alone in the hope that it might be valid in the | |
| 259 address. | |
| 260 | |
| 261 X may contain no arithmetic except addition, subtraction and multiplication. | |
| 262 Values returned by expand_expr with 1 for sum_ok fit this constraint. */ | |
| 263 | |
| 264 static rtx | |
| 265 break_out_memory_refs (rtx x) | |
| 266 { | |
| 267 if (MEM_P (x) | |
| 268 || (CONSTANT_P (x) && CONSTANT_ADDRESS_P (x) | |
| 269 && GET_MODE (x) != VOIDmode)) | |
| 270 x = force_reg (GET_MODE (x), x); | |
| 271 else if (GET_CODE (x) == PLUS || GET_CODE (x) == MINUS | |
| 272 || GET_CODE (x) == MULT) | |
| 273 { | |
| 274 rtx op0 = break_out_memory_refs (XEXP (x, 0)); | |
| 275 rtx op1 = break_out_memory_refs (XEXP (x, 1)); | |
| 276 | |
| 277 if (op0 != XEXP (x, 0) || op1 != XEXP (x, 1)) | |
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278 x = simplify_gen_binary (GET_CODE (x), GET_MODE (x), op0, op1); |
| 0 | 279 } |
| 280 | |
| 281 return x; | |
| 282 } | |
| 283 | |
|
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284 /* Given X, a memory address in address space AS' pointer mode, convert it to |
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285 an address in the address space's address mode, or vice versa (TO_MODE says |
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286 which way). We take advantage of the fact that pointers are not allowed to |
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287 overflow by commuting arithmetic operations over conversions so that address |
| 111 | 288 arithmetic insns can be used. IN_CONST is true if this conversion is inside |
| 289 a CONST. NO_EMIT is true if no insns should be emitted, and instead | |
| 290 it should return NULL if it can't be simplified without emitting insns. */ | |
| 0 | 291 |
| 292 rtx | |
| 111 | 293 convert_memory_address_addr_space_1 (scalar_int_mode to_mode ATTRIBUTE_UNUSED, |
| 294 rtx x, addr_space_t as ATTRIBUTE_UNUSED, | |
| 295 bool in_const ATTRIBUTE_UNUSED, | |
| 296 bool no_emit ATTRIBUTE_UNUSED) | |
| 0 | 297 { |
| 298 #ifndef POINTERS_EXTEND_UNSIGNED | |
| 299 gcc_assert (GET_MODE (x) == to_mode || GET_MODE (x) == VOIDmode); | |
| 300 return x; | |
| 301 #else /* defined(POINTERS_EXTEND_UNSIGNED) */ | |
| 111 | 302 scalar_int_mode pointer_mode, address_mode, from_mode; |
| 0 | 303 rtx temp; |
| 304 enum rtx_code code; | |
| 305 | |
| 306 /* If X already has the right mode, just return it. */ | |
| 307 if (GET_MODE (x) == to_mode) | |
| 308 return x; | |
| 309 | |
|
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310 pointer_mode = targetm.addr_space.pointer_mode (as); |
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311 address_mode = targetm.addr_space.address_mode (as); |
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312 from_mode = to_mode == pointer_mode ? address_mode : pointer_mode; |
| 0 | 313 |
| 314 /* Here we handle some special cases. If none of them apply, fall through | |
| 315 to the default case. */ | |
| 316 switch (GET_CODE (x)) | |
| 317 { | |
| 111 | 318 CASE_CONST_SCALAR_INT: |
| 0 | 319 if (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (from_mode)) |
| 320 code = TRUNCATE; | |
| 321 else if (POINTERS_EXTEND_UNSIGNED < 0) | |
| 322 break; | |
| 323 else if (POINTERS_EXTEND_UNSIGNED > 0) | |
| 324 code = ZERO_EXTEND; | |
| 325 else | |
| 326 code = SIGN_EXTEND; | |
| 327 temp = simplify_unary_operation (code, to_mode, x, from_mode); | |
| 328 if (temp) | |
| 329 return temp; | |
| 330 break; | |
| 331 | |
| 332 case SUBREG: | |
| 333 if ((SUBREG_PROMOTED_VAR_P (x) || REG_POINTER (SUBREG_REG (x))) | |
| 334 && GET_MODE (SUBREG_REG (x)) == to_mode) | |
| 335 return SUBREG_REG (x); | |
| 336 break; | |
| 337 | |
| 338 case LABEL_REF: | |
| 111 | 339 temp = gen_rtx_LABEL_REF (to_mode, label_ref_label (x)); |
| 0 | 340 LABEL_REF_NONLOCAL_P (temp) = LABEL_REF_NONLOCAL_P (x); |
| 341 return temp; | |
| 342 | |
| 343 case SYMBOL_REF: | |
| 344 temp = shallow_copy_rtx (x); | |
| 345 PUT_MODE (temp, to_mode); | |
| 346 return temp; | |
| 347 | |
| 348 case CONST: | |
| 111 | 349 temp = convert_memory_address_addr_space_1 (to_mode, XEXP (x, 0), as, |
| 350 true, no_emit); | |
| 351 return temp ? gen_rtx_CONST (to_mode, temp) : temp; | |
| 0 | 352 |
| 353 case PLUS: | |
| 354 case MULT: | |
| 355 /* For addition we can safely permute the conversion and addition | |
| 356 operation if one operand is a constant and converting the constant | |
| 357 does not change it or if one operand is a constant and we are | |
| 358 using a ptr_extend instruction (POINTERS_EXTEND_UNSIGNED < 0). | |
| 359 We can always safely permute them if we are making the address | |
| 111 | 360 narrower. Inside a CONST RTL, this is safe for both pointers |
| 361 zero or sign extended as pointers cannot wrap. */ | |
| 0 | 362 if (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (from_mode) |
| 363 || (GET_CODE (x) == PLUS | |
|
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364 && CONST_INT_P (XEXP (x, 1)) |
| 111 | 365 && ((in_const && POINTERS_EXTEND_UNSIGNED != 0) |
| 366 || XEXP (x, 1) == convert_memory_address_addr_space_1 | |
| 367 (to_mode, XEXP (x, 1), as, in_const, | |
| 368 no_emit) | |
| 369 || POINTERS_EXTEND_UNSIGNED < 0))) | |
| 370 { | |
| 371 temp = convert_memory_address_addr_space_1 (to_mode, XEXP (x, 0), | |
| 372 as, in_const, no_emit); | |
| 373 return (temp ? gen_rtx_fmt_ee (GET_CODE (x), to_mode, | |
| 374 temp, XEXP (x, 1)) | |
| 375 : temp); | |
| 376 } | |
| 0 | 377 break; |
| 378 | |
| 379 default: | |
| 380 break; | |
| 381 } | |
| 382 | |
| 111 | 383 if (no_emit) |
| 384 return NULL_RTX; | |
| 385 | |
| 0 | 386 return convert_modes (to_mode, from_mode, |
| 387 x, POINTERS_EXTEND_UNSIGNED); | |
| 388 #endif /* defined(POINTERS_EXTEND_UNSIGNED) */ | |
| 389 } | |
| 111 | 390 |
| 391 /* Given X, a memory address in address space AS' pointer mode, convert it to | |
| 392 an address in the address space's address mode, or vice versa (TO_MODE says | |
| 393 which way). We take advantage of the fact that pointers are not allowed to | |
| 394 overflow by commuting arithmetic operations over conversions so that address | |
| 395 arithmetic insns can be used. */ | |
| 396 | |
| 397 rtx | |
| 398 convert_memory_address_addr_space (scalar_int_mode to_mode, rtx x, | |
| 399 addr_space_t as) | |
| 400 { | |
| 401 return convert_memory_address_addr_space_1 (to_mode, x, as, false, false); | |
| 402 } | |
| 0 | 403 |
| 111 | 404 |
|
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405 /* Return something equivalent to X but valid as a memory address for something |
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406 of mode MODE in the named address space AS. When X is not itself valid, |
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407 this works by copying X or subexpressions of it into registers. */ |
| 0 | 408 |
| 409 rtx | |
| 111 | 410 memory_address_addr_space (machine_mode mode, rtx x, addr_space_t as) |
| 0 | 411 { |
| 412 rtx oldx = x; | |
| 111 | 413 scalar_int_mode address_mode = targetm.addr_space.address_mode (as); |
| 0 | 414 |
|
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415 x = convert_memory_address_addr_space (address_mode, x, as); |
| 0 | 416 |
| 417 /* By passing constant addresses through registers | |
| 418 we get a chance to cse them. */ | |
| 419 if (! cse_not_expected && CONSTANT_P (x) && CONSTANT_ADDRESS_P (x)) | |
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420 x = force_reg (address_mode, x); |
| 0 | 421 |
| 422 /* We get better cse by rejecting indirect addressing at this stage. | |
| 423 Let the combiner create indirect addresses where appropriate. | |
| 424 For now, generate the code so that the subexpressions useful to share | |
| 425 are visible. But not if cse won't be done! */ | |
| 426 else | |
| 427 { | |
| 428 if (! cse_not_expected && !REG_P (x)) | |
| 429 x = break_out_memory_refs (x); | |
| 430 | |
| 431 /* At this point, any valid address is accepted. */ | |
|
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432 if (memory_address_addr_space_p (mode, x, as)) |
| 0 | 433 goto done; |
| 434 | |
| 435 /* If it was valid before but breaking out memory refs invalidated it, | |
| 436 use it the old way. */ | |
|
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437 if (memory_address_addr_space_p (mode, oldx, as)) |
| 0 | 438 { |
| 439 x = oldx; | |
| 440 goto done; | |
| 441 } | |
| 442 | |
| 443 /* Perform machine-dependent transformations on X | |
| 444 in certain cases. This is not necessary since the code | |
| 445 below can handle all possible cases, but machine-dependent | |
| 446 transformations can make better code. */ | |
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447 { |
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448 rtx orig_x = x; |
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449 x = targetm.addr_space.legitimize_address (x, oldx, mode, as); |
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450 if (orig_x != x && memory_address_addr_space_p (mode, x, as)) |
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451 goto done; |
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452 } |
| 0 | 453 |
| 454 /* PLUS and MULT can appear in special ways | |
| 455 as the result of attempts to make an address usable for indexing. | |
| 456 Usually they are dealt with by calling force_operand, below. | |
| 457 But a sum containing constant terms is special | |
| 458 if removing them makes the sum a valid address: | |
| 459 then we generate that address in a register | |
| 460 and index off of it. We do this because it often makes | |
| 461 shorter code, and because the addresses thus generated | |
| 462 in registers often become common subexpressions. */ | |
| 463 if (GET_CODE (x) == PLUS) | |
| 464 { | |
| 465 rtx constant_term = const0_rtx; | |
| 466 rtx y = eliminate_constant_term (x, &constant_term); | |
| 467 if (constant_term == const0_rtx | |
|
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468 || ! memory_address_addr_space_p (mode, y, as)) |
| 0 | 469 x = force_operand (x, NULL_RTX); |
| 470 else | |
| 471 { | |
| 472 y = gen_rtx_PLUS (GET_MODE (x), copy_to_reg (y), constant_term); | |
|
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473 if (! memory_address_addr_space_p (mode, y, as)) |
| 0 | 474 x = force_operand (x, NULL_RTX); |
| 475 else | |
| 476 x = y; | |
| 477 } | |
| 478 } | |
| 479 | |
| 480 else if (GET_CODE (x) == MULT || GET_CODE (x) == MINUS) | |
| 481 x = force_operand (x, NULL_RTX); | |
| 482 | |
| 483 /* If we have a register that's an invalid address, | |
| 484 it must be a hard reg of the wrong class. Copy it to a pseudo. */ | |
| 485 else if (REG_P (x)) | |
| 486 x = copy_to_reg (x); | |
| 487 | |
| 488 /* Last resort: copy the value to a register, since | |
| 489 the register is a valid address. */ | |
| 490 else | |
|
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491 x = force_reg (address_mode, x); |
| 0 | 492 } |
| 493 | |
| 494 done: | |
| 495 | |
|
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496 gcc_assert (memory_address_addr_space_p (mode, x, as)); |
| 0 | 497 /* If we didn't change the address, we are done. Otherwise, mark |
| 498 a reg as a pointer if we have REG or REG + CONST_INT. */ | |
| 499 if (oldx == x) | |
| 500 return x; | |
| 501 else if (REG_P (x)) | |
| 502 mark_reg_pointer (x, BITS_PER_UNIT); | |
| 503 else if (GET_CODE (x) == PLUS | |
| 504 && REG_P (XEXP (x, 0)) | |
|
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505 && CONST_INT_P (XEXP (x, 1))) |
| 0 | 506 mark_reg_pointer (XEXP (x, 0), BITS_PER_UNIT); |
| 507 | |
| 508 /* OLDX may have been the address on a temporary. Update the address | |
| 509 to indicate that X is now used. */ | |
| 510 update_temp_slot_address (oldx, x); | |
| 511 | |
| 512 return x; | |
| 513 } | |
| 514 | |
| 515 /* Convert a mem ref into one with a valid memory address. | |
| 516 Pass through anything else unchanged. */ | |
| 517 | |
| 518 rtx | |
| 519 validize_mem (rtx ref) | |
| 520 { | |
| 521 if (!MEM_P (ref)) | |
| 522 return ref; | |
| 523 ref = use_anchored_address (ref); | |
|
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524 if (memory_address_addr_space_p (GET_MODE (ref), XEXP (ref, 0), |
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525 MEM_ADDR_SPACE (ref))) |
| 0 | 526 return ref; |
| 527 | |
| 528 /* Don't alter REF itself, since that is probably a stack slot. */ | |
| 529 return replace_equiv_address (ref, XEXP (ref, 0)); | |
| 530 } | |
| 531 | |
| 532 /* If X is a memory reference to a member of an object block, try rewriting | |
| 533 it to use an anchor instead. Return the new memory reference on success | |
| 534 and the old one on failure. */ | |
| 535 | |
| 536 rtx | |
| 537 use_anchored_address (rtx x) | |
| 538 { | |
| 539 rtx base; | |
| 540 HOST_WIDE_INT offset; | |
| 111 | 541 machine_mode mode; |
| 0 | 542 |
| 543 if (!flag_section_anchors) | |
| 544 return x; | |
| 545 | |
| 546 if (!MEM_P (x)) | |
| 547 return x; | |
| 548 | |
| 549 /* Split the address into a base and offset. */ | |
| 550 base = XEXP (x, 0); | |
| 551 offset = 0; | |
| 552 if (GET_CODE (base) == CONST | |
| 553 && GET_CODE (XEXP (base, 0)) == PLUS | |
|
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554 && CONST_INT_P (XEXP (XEXP (base, 0), 1))) |
| 0 | 555 { |
| 556 offset += INTVAL (XEXP (XEXP (base, 0), 1)); | |
| 557 base = XEXP (XEXP (base, 0), 0); | |
| 558 } | |
| 559 | |
| 560 /* Check whether BASE is suitable for anchors. */ | |
| 561 if (GET_CODE (base) != SYMBOL_REF | |
| 562 || !SYMBOL_REF_HAS_BLOCK_INFO_P (base) | |
| 563 || SYMBOL_REF_ANCHOR_P (base) | |
| 564 || SYMBOL_REF_BLOCK (base) == NULL | |
| 565 || !targetm.use_anchors_for_symbol_p (base)) | |
| 566 return x; | |
| 567 | |
| 568 /* Decide where BASE is going to be. */ | |
| 569 place_block_symbol (base); | |
| 570 | |
| 571 /* Get the anchor we need to use. */ | |
| 572 offset += SYMBOL_REF_BLOCK_OFFSET (base); | |
| 573 base = get_section_anchor (SYMBOL_REF_BLOCK (base), offset, | |
| 574 SYMBOL_REF_TLS_MODEL (base)); | |
| 575 | |
| 576 /* Work out the offset from the anchor. */ | |
| 577 offset -= SYMBOL_REF_BLOCK_OFFSET (base); | |
| 578 | |
| 579 /* If we're going to run a CSE pass, force the anchor into a register. | |
| 580 We will then be able to reuse registers for several accesses, if the | |
| 581 target costs say that that's worthwhile. */ | |
| 111 | 582 mode = GET_MODE (base); |
| 0 | 583 if (!cse_not_expected) |
| 111 | 584 base = force_reg (mode, base); |
| 0 | 585 |
| 111 | 586 return replace_equiv_address (x, plus_constant (mode, base, offset)); |
| 0 | 587 } |
| 588 | |
| 589 /* Copy the value or contents of X to a new temp reg and return that reg. */ | |
| 590 | |
| 591 rtx | |
| 592 copy_to_reg (rtx x) | |
| 593 { | |
| 594 rtx temp = gen_reg_rtx (GET_MODE (x)); | |
| 595 | |
| 596 /* If not an operand, must be an address with PLUS and MULT so | |
| 597 do the computation. */ | |
| 598 if (! general_operand (x, VOIDmode)) | |
| 599 x = force_operand (x, temp); | |
| 600 | |
| 601 if (x != temp) | |
| 602 emit_move_insn (temp, x); | |
| 603 | |
| 604 return temp; | |
| 605 } | |
| 606 | |
| 607 /* Like copy_to_reg but always give the new register mode Pmode | |
| 608 in case X is a constant. */ | |
| 609 | |
| 610 rtx | |
| 611 copy_addr_to_reg (rtx x) | |
| 612 { | |
| 613 return copy_to_mode_reg (Pmode, x); | |
| 614 } | |
| 615 | |
| 616 /* Like copy_to_reg but always give the new register mode MODE | |
| 617 in case X is a constant. */ | |
| 618 | |
| 619 rtx | |
| 111 | 620 copy_to_mode_reg (machine_mode mode, rtx x) |
| 0 | 621 { |
| 622 rtx temp = gen_reg_rtx (mode); | |
| 623 | |
| 624 /* If not an operand, must be an address with PLUS and MULT so | |
| 625 do the computation. */ | |
| 626 if (! general_operand (x, VOIDmode)) | |
| 627 x = force_operand (x, temp); | |
| 628 | |
| 629 gcc_assert (GET_MODE (x) == mode || GET_MODE (x) == VOIDmode); | |
| 630 if (x != temp) | |
| 631 emit_move_insn (temp, x); | |
| 632 return temp; | |
| 633 } | |
| 634 | |
| 635 /* Load X into a register if it is not already one. | |
| 636 Use mode MODE for the register. | |
| 637 X should be valid for mode MODE, but it may be a constant which | |
| 638 is valid for all integer modes; that's why caller must specify MODE. | |
| 639 | |
| 640 The caller must not alter the value in the register we return, | |
| 641 since we mark it as a "constant" register. */ | |
| 642 | |
| 643 rtx | |
| 111 | 644 force_reg (machine_mode mode, rtx x) |
| 0 | 645 { |
| 111 | 646 rtx temp, set; |
| 647 rtx_insn *insn; | |
| 0 | 648 |
| 649 if (REG_P (x)) | |
| 650 return x; | |
| 651 | |
| 652 if (general_operand (x, mode)) | |
| 653 { | |
| 654 temp = gen_reg_rtx (mode); | |
| 655 insn = emit_move_insn (temp, x); | |
| 656 } | |
| 657 else | |
| 658 { | |
| 659 temp = force_operand (x, NULL_RTX); | |
| 660 if (REG_P (temp)) | |
| 661 insn = get_last_insn (); | |
| 662 else | |
| 663 { | |
| 664 rtx temp2 = gen_reg_rtx (mode); | |
| 665 insn = emit_move_insn (temp2, temp); | |
| 666 temp = temp2; | |
| 667 } | |
| 668 } | |
| 669 | |
| 670 /* Let optimizers know that TEMP's value never changes | |
| 671 and that X can be substituted for it. Don't get confused | |
| 672 if INSN set something else (such as a SUBREG of TEMP). */ | |
| 673 if (CONSTANT_P (x) | |
| 674 && (set = single_set (insn)) != 0 | |
| 675 && SET_DEST (set) == temp | |
| 676 && ! rtx_equal_p (x, SET_SRC (set))) | |
| 677 set_unique_reg_note (insn, REG_EQUAL, x); | |
| 678 | |
| 679 /* Let optimizers know that TEMP is a pointer, and if so, the | |
| 680 known alignment of that pointer. */ | |
| 681 { | |
| 682 unsigned align = 0; | |
| 683 if (GET_CODE (x) == SYMBOL_REF) | |
| 684 { | |
| 685 align = BITS_PER_UNIT; | |
| 686 if (SYMBOL_REF_DECL (x) && DECL_P (SYMBOL_REF_DECL (x))) | |
| 687 align = DECL_ALIGN (SYMBOL_REF_DECL (x)); | |
| 688 } | |
| 689 else if (GET_CODE (x) == LABEL_REF) | |
| 690 align = BITS_PER_UNIT; | |
| 691 else if (GET_CODE (x) == CONST | |
| 692 && GET_CODE (XEXP (x, 0)) == PLUS | |
| 693 && GET_CODE (XEXP (XEXP (x, 0), 0)) == SYMBOL_REF | |
|
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694 && CONST_INT_P (XEXP (XEXP (x, 0), 1))) |
| 0 | 695 { |
| 696 rtx s = XEXP (XEXP (x, 0), 0); | |
| 697 rtx c = XEXP (XEXP (x, 0), 1); | |
| 698 unsigned sa, ca; | |
| 699 | |
| 700 sa = BITS_PER_UNIT; | |
| 701 if (SYMBOL_REF_DECL (s) && DECL_P (SYMBOL_REF_DECL (s))) | |
| 702 sa = DECL_ALIGN (SYMBOL_REF_DECL (s)); | |
| 703 | |
|
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704 if (INTVAL (c) == 0) |
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705 align = sa; |
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706 else |
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707 { |
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708 ca = ctz_hwi (INTVAL (c)) * BITS_PER_UNIT; |
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709 align = MIN (sa, ca); |
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710 } |
| 0 | 711 } |
| 712 | |
| 713 if (align || (MEM_P (x) && MEM_POINTER (x))) | |
| 714 mark_reg_pointer (temp, align); | |
| 715 } | |
| 716 | |
| 717 return temp; | |
| 718 } | |
| 719 | |
| 720 /* If X is a memory ref, copy its contents to a new temp reg and return | |
| 721 that reg. Otherwise, return X. */ | |
| 722 | |
| 723 rtx | |
| 724 force_not_mem (rtx x) | |
| 725 { | |
| 726 rtx temp; | |
| 727 | |
| 728 if (!MEM_P (x) || GET_MODE (x) == BLKmode) | |
| 729 return x; | |
| 730 | |
| 731 temp = gen_reg_rtx (GET_MODE (x)); | |
| 732 | |
| 733 if (MEM_POINTER (x)) | |
| 734 REG_POINTER (temp) = 1; | |
| 735 | |
| 736 emit_move_insn (temp, x); | |
| 737 return temp; | |
| 738 } | |
| 739 | |
| 740 /* Copy X to TARGET (if it's nonzero and a reg) | |
| 741 or to a new temp reg and return that reg. | |
| 742 MODE is the mode to use for X in case it is a constant. */ | |
| 743 | |
| 744 rtx | |
| 111 | 745 copy_to_suggested_reg (rtx x, rtx target, machine_mode mode) |
| 0 | 746 { |
| 747 rtx temp; | |
| 748 | |
| 749 if (target && REG_P (target)) | |
| 750 temp = target; | |
| 751 else | |
| 752 temp = gen_reg_rtx (mode); | |
| 753 | |
| 754 emit_move_insn (temp, x); | |
| 755 return temp; | |
| 756 } | |
| 757 | |
|
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758 /* Return the mode to use to pass or return a scalar of TYPE and MODE. |
| 0 | 759 PUNSIGNEDP points to the signedness of the type and may be adjusted |
| 760 to show what signedness to use on extension operations. | |
| 761 | |
|
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762 FOR_RETURN is nonzero if the caller is promoting the return value |
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763 of FNDECL, else it is for promoting args. */ |
| 0 | 764 |
| 111 | 765 machine_mode |
| 766 promote_function_mode (const_tree type, machine_mode mode, int *punsignedp, | |
|
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767 const_tree funtype, int for_return) |
| 0 | 768 { |
| 111 | 769 /* Called without a type node for a libcall. */ |
| 770 if (type == NULL_TREE) | |
| 771 { | |
| 772 if (INTEGRAL_MODE_P (mode)) | |
| 773 return targetm.calls.promote_function_mode (NULL_TREE, mode, | |
| 774 punsignedp, funtype, | |
| 775 for_return); | |
| 776 else | |
| 777 return mode; | |
| 778 } | |
| 779 | |
|
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780 switch (TREE_CODE (type)) |
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781 { |
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782 case INTEGER_TYPE: case ENUMERAL_TYPE: case BOOLEAN_TYPE: |
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783 case REAL_TYPE: case OFFSET_TYPE: case FIXED_POINT_TYPE: |
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784 case POINTER_TYPE: case REFERENCE_TYPE: |
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785 return targetm.calls.promote_function_mode (type, mode, punsignedp, funtype, |
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786 for_return); |
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787 |
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788 default: |
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789 return mode; |
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790 } |
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791 } |
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792 /* Return the mode to use to store a scalar of TYPE and MODE. |
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793 PUNSIGNEDP points to the signedness of the type and may be adjusted |
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794 to show what signedness to use on extension operations. */ |
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795 |
| 111 | 796 machine_mode |
| 797 promote_mode (const_tree type ATTRIBUTE_UNUSED, machine_mode mode, | |
|
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798 int *punsignedp ATTRIBUTE_UNUSED) |
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799 { |
| 111 | 800 #ifdef PROMOTE_MODE |
| 801 enum tree_code code; | |
| 802 int unsignedp; | |
| 803 scalar_mode smode; | |
| 804 #endif | |
| 805 | |
| 806 /* For libcalls this is invoked without TYPE from the backends | |
| 807 TARGET_PROMOTE_FUNCTION_MODE hooks. Don't do anything in that | |
| 808 case. */ | |
| 809 if (type == NULL_TREE) | |
| 810 return mode; | |
| 811 | |
|
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812 /* FIXME: this is the same logic that was there until GCC 4.4, but we |
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813 probably want to test POINTERS_EXTEND_UNSIGNED even if PROMOTE_MODE |
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814 is not defined. The affected targets are M32C, S390, SPARC. */ |
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815 #ifdef PROMOTE_MODE |
| 111 | 816 code = TREE_CODE (type); |
| 817 unsignedp = *punsignedp; | |
| 0 | 818 |
| 819 switch (code) | |
| 820 { | |
| 821 case INTEGER_TYPE: case ENUMERAL_TYPE: case BOOLEAN_TYPE: | |
| 822 case REAL_TYPE: case OFFSET_TYPE: case FIXED_POINT_TYPE: | |
| 111 | 823 /* Values of these types always have scalar mode. */ |
| 824 smode = as_a <scalar_mode> (mode); | |
| 825 PROMOTE_MODE (smode, unsignedp, type); | |
|
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826 *punsignedp = unsignedp; |
| 111 | 827 return smode; |
| 0 | 828 |
| 829 #ifdef POINTERS_EXTEND_UNSIGNED | |
| 830 case REFERENCE_TYPE: | |
| 831 case POINTER_TYPE: | |
|
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832 *punsignedp = POINTERS_EXTEND_UNSIGNED; |
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833 return targetm.addr_space.address_mode |
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834 (TYPE_ADDR_SPACE (TREE_TYPE (type))); |
| 0 | 835 #endif |
| 836 | |
| 837 default: | |
|
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838 return mode; |
| 0 | 839 } |
|
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840 #else |
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841 return mode; |
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842 #endif |
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843 } |
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844 |
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845 |
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846 /* Use one of promote_mode or promote_function_mode to find the promoted |
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847 mode of DECL. If PUNSIGNEDP is not NULL, store there the unsignedness |
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848 of DECL after promotion. */ |
| 0 | 849 |
| 111 | 850 machine_mode |
|
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851 promote_decl_mode (const_tree decl, int *punsignedp) |
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852 { |
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853 tree type = TREE_TYPE (decl); |
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854 int unsignedp = TYPE_UNSIGNED (type); |
| 111 | 855 machine_mode mode = DECL_MODE (decl); |
| 856 machine_mode pmode; | |
|
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857 |
| 111 | 858 if (TREE_CODE (decl) == RESULT_DECL && !DECL_BY_REFERENCE (decl)) |
| 859 pmode = promote_function_mode (type, mode, &unsignedp, | |
| 860 TREE_TYPE (current_function_decl), 1); | |
| 861 else if (TREE_CODE (decl) == RESULT_DECL || TREE_CODE (decl) == PARM_DECL) | |
|
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862 pmode = promote_function_mode (type, mode, &unsignedp, |
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863 TREE_TYPE (current_function_decl), 2); |
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864 else |
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865 pmode = promote_mode (type, mode, &unsignedp); |
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866 |
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867 if (punsignedp) |
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868 *punsignedp = unsignedp; |
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869 return pmode; |
| 0 | 870 } |
|
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871 |
| 111 | 872 /* Return the promoted mode for name. If it is a named SSA_NAME, it |
| 873 is the same as promote_decl_mode. Otherwise, it is the promoted | |
| 874 mode of a temp decl of same type as the SSA_NAME, if we had created | |
| 875 one. */ | |
| 876 | |
| 877 machine_mode | |
| 878 promote_ssa_mode (const_tree name, int *punsignedp) | |
| 879 { | |
| 880 gcc_assert (TREE_CODE (name) == SSA_NAME); | |
| 881 | |
| 882 /* Partitions holding parms and results must be promoted as expected | |
| 883 by function.c. */ | |
| 884 if (SSA_NAME_VAR (name) | |
| 885 && (TREE_CODE (SSA_NAME_VAR (name)) == PARM_DECL | |
| 886 || TREE_CODE (SSA_NAME_VAR (name)) == RESULT_DECL)) | |
| 887 { | |
| 888 machine_mode mode = promote_decl_mode (SSA_NAME_VAR (name), punsignedp); | |
| 889 if (mode != BLKmode) | |
| 890 return mode; | |
| 891 } | |
| 892 | |
| 893 tree type = TREE_TYPE (name); | |
| 894 int unsignedp = TYPE_UNSIGNED (type); | |
| 145 | 895 machine_mode pmode = promote_mode (type, TYPE_MODE (type), &unsignedp); |
| 111 | 896 if (punsignedp) |
| 897 *punsignedp = unsignedp; | |
| 898 | |
| 899 return pmode; | |
| 900 } | |
| 901 | |
| 902 | |
| 0 | 903 |
| 111 | 904 /* Controls the behavior of {anti_,}adjust_stack. */ |
| 905 static bool suppress_reg_args_size; | |
| 906 | |
| 907 /* A helper for adjust_stack and anti_adjust_stack. */ | |
| 908 | |
| 909 static void | |
| 910 adjust_stack_1 (rtx adjust, bool anti_p) | |
| 911 { | |
| 912 rtx temp; | |
| 913 rtx_insn *insn; | |
| 914 | |
| 915 /* Hereafter anti_p means subtract_p. */ | |
| 916 if (!STACK_GROWS_DOWNWARD) | |
| 917 anti_p = !anti_p; | |
| 918 | |
| 919 temp = expand_binop (Pmode, | |
| 920 anti_p ? sub_optab : add_optab, | |
| 921 stack_pointer_rtx, adjust, stack_pointer_rtx, 0, | |
| 922 OPTAB_LIB_WIDEN); | |
| 923 | |
| 924 if (temp != stack_pointer_rtx) | |
| 925 insn = emit_move_insn (stack_pointer_rtx, temp); | |
| 926 else | |
| 927 { | |
| 928 insn = get_last_insn (); | |
| 929 temp = single_set (insn); | |
| 930 gcc_assert (temp != NULL && SET_DEST (temp) == stack_pointer_rtx); | |
| 931 } | |
| 932 | |
| 933 if (!suppress_reg_args_size) | |
| 131 | 934 add_args_size_note (insn, stack_pointer_delta); |
| 111 | 935 } |
| 936 | |
| 0 | 937 /* Adjust the stack pointer by ADJUST (an rtx for a number of bytes). |
| 938 This pops when ADJUST is positive. ADJUST need not be constant. */ | |
| 939 | |
| 940 void | |
| 941 adjust_stack (rtx adjust) | |
| 942 { | |
| 943 if (adjust == const0_rtx) | |
| 944 return; | |
| 945 | |
| 946 /* We expect all variable sized adjustments to be multiple of | |
| 947 PREFERRED_STACK_BOUNDARY. */ | |
| 131 | 948 poly_int64 const_adjust; |
| 949 if (poly_int_rtx_p (adjust, &const_adjust)) | |
| 950 stack_pointer_delta -= const_adjust; | |
| 0 | 951 |
| 111 | 952 adjust_stack_1 (adjust, false); |
| 0 | 953 } |
| 954 | |
| 955 /* Adjust the stack pointer by minus ADJUST (an rtx for a number of bytes). | |
| 956 This pushes when ADJUST is positive. ADJUST need not be constant. */ | |
| 957 | |
| 958 void | |
| 959 anti_adjust_stack (rtx adjust) | |
| 960 { | |
| 961 if (adjust == const0_rtx) | |
| 962 return; | |
| 963 | |
| 964 /* We expect all variable sized adjustments to be multiple of | |
| 965 PREFERRED_STACK_BOUNDARY. */ | |
| 131 | 966 poly_int64 const_adjust; |
| 967 if (poly_int_rtx_p (adjust, &const_adjust)) | |
| 968 stack_pointer_delta += const_adjust; | |
| 0 | 969 |
| 111 | 970 adjust_stack_1 (adjust, true); |
| 0 | 971 } |
| 972 | |
| 973 /* Round the size of a block to be pushed up to the boundary required | |
| 974 by this machine. SIZE is the desired size, which need not be constant. */ | |
| 975 | |
| 976 static rtx | |
| 977 round_push (rtx size) | |
| 978 { | |
|
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979 rtx align_rtx, alignm1_rtx; |
| 0 | 980 |
|
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981 if (!SUPPORTS_STACK_ALIGNMENT |
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982 || crtl->preferred_stack_boundary == MAX_SUPPORTED_STACK_ALIGNMENT) |
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983 { |
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984 int align = crtl->preferred_stack_boundary / BITS_PER_UNIT; |
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985 |
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986 if (align == 1) |
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987 return size; |
| 0 | 988 |
|
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989 if (CONST_INT_P (size)) |
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990 { |
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991 HOST_WIDE_INT new_size = (INTVAL (size) + align - 1) / align * align; |
| 0 | 992 |
|
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993 if (INTVAL (size) != new_size) |
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994 size = GEN_INT (new_size); |
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995 return size; |
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996 } |
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997 |
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998 align_rtx = GEN_INT (align); |
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999 alignm1_rtx = GEN_INT (align - 1); |
| 0 | 1000 } |
| 1001 else | |
| 1002 { | |
|
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1003 /* If crtl->preferred_stack_boundary might still grow, use |
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1004 virtual_preferred_stack_boundary_rtx instead. This will be |
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1005 substituted by the right value in vregs pass and optimized |
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1006 during combine. */ |
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1007 align_rtx = virtual_preferred_stack_boundary_rtx; |
| 111 | 1008 alignm1_rtx = force_operand (plus_constant (Pmode, align_rtx, -1), |
| 1009 NULL_RTX); | |
| 0 | 1010 } |
| 1011 | |
|
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1012 /* CEIL_DIV_EXPR needs to worry about the addition overflowing, |
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1013 but we know it can't. So add ourselves and then do |
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1014 TRUNC_DIV_EXPR. */ |
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1015 size = expand_binop (Pmode, add_optab, size, alignm1_rtx, |
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1016 NULL_RTX, 1, OPTAB_LIB_WIDEN); |
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1017 size = expand_divmod (0, TRUNC_DIV_EXPR, Pmode, size, align_rtx, |
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1018 NULL_RTX, 1); |
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1019 size = expand_mult (Pmode, size, align_rtx, NULL_RTX, 1); |
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1020 |
| 0 | 1021 return size; |
| 1022 } | |
| 1023 | |
| 1024 /* Save the stack pointer for the purpose in SAVE_LEVEL. PSAVE is a pointer | |
| 1025 to a previously-created save area. If no save area has been allocated, | |
| 1026 this function will allocate one. If a save area is specified, it | |
|
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1027 must be of the proper mode. */ |
| 0 | 1028 |
| 1029 void | |
|
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1030 emit_stack_save (enum save_level save_level, rtx *psave) |
| 0 | 1031 { |
| 1032 rtx sa = *psave; | |
| 1033 /* The default is that we use a move insn and save in a Pmode object. */ | |
| 111 | 1034 rtx_insn *(*fcn) (rtx, rtx) = gen_move_insn; |
| 1035 machine_mode mode = STACK_SAVEAREA_MODE (save_level); | |
| 0 | 1036 |
| 1037 /* See if this machine has anything special to do for this kind of save. */ | |
| 1038 switch (save_level) | |
| 1039 { | |
| 1040 case SAVE_BLOCK: | |
| 111 | 1041 if (targetm.have_save_stack_block ()) |
| 1042 fcn = targetm.gen_save_stack_block; | |
| 0 | 1043 break; |
| 1044 case SAVE_FUNCTION: | |
| 111 | 1045 if (targetm.have_save_stack_function ()) |
| 1046 fcn = targetm.gen_save_stack_function; | |
| 0 | 1047 break; |
| 1048 case SAVE_NONLOCAL: | |
| 111 | 1049 if (targetm.have_save_stack_nonlocal ()) |
| 1050 fcn = targetm.gen_save_stack_nonlocal; | |
| 0 | 1051 break; |
| 1052 default: | |
| 1053 break; | |
| 1054 } | |
| 1055 | |
| 1056 /* If there is no save area and we have to allocate one, do so. Otherwise | |
| 1057 verify the save area is the proper mode. */ | |
| 1058 | |
| 1059 if (sa == 0) | |
| 1060 { | |
| 1061 if (mode != VOIDmode) | |
| 1062 { | |
| 1063 if (save_level == SAVE_NONLOCAL) | |
| 1064 *psave = sa = assign_stack_local (mode, GET_MODE_SIZE (mode), 0); | |
| 1065 else | |
| 1066 *psave = sa = gen_reg_rtx (mode); | |
| 1067 } | |
| 1068 } | |
| 1069 | |
|
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1070 do_pending_stack_adjust (); |
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1071 if (sa != 0) |
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1072 sa = validize_mem (sa); |
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1073 emit_insn (fcn (sa, stack_pointer_rtx)); |
| 0 | 1074 } |
| 1075 | |
| 1076 /* Restore the stack pointer for the purpose in SAVE_LEVEL. SA is the save | |
|
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1077 area made by emit_stack_save. If it is zero, we have nothing to do. */ |
| 0 | 1078 |
| 1079 void | |
|
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1080 emit_stack_restore (enum save_level save_level, rtx sa) |
| 0 | 1081 { |
| 1082 /* The default is that we use a move insn. */ | |
| 111 | 1083 rtx_insn *(*fcn) (rtx, rtx) = gen_move_insn; |
| 1084 | |
| 1085 /* If stack_realign_drap, the x86 backend emits a prologue that aligns both | |
| 1086 STACK_POINTER and HARD_FRAME_POINTER. | |
| 1087 If stack_realign_fp, the x86 backend emits a prologue that aligns only | |
| 1088 STACK_POINTER. This renders the HARD_FRAME_POINTER unusable for accessing | |
| 1089 aligned variables, which is reflected in ix86_can_eliminate. | |
| 1090 We normally still have the realigned STACK_POINTER that we can use. | |
| 1091 But if there is a stack restore still present at reload, it can trigger | |
| 1092 mark_not_eliminable for the STACK_POINTER, leaving no way to eliminate | |
| 1093 FRAME_POINTER into a hard reg. | |
| 1094 To prevent this situation, we force need_drap if we emit a stack | |
| 1095 restore. */ | |
| 1096 if (SUPPORTS_STACK_ALIGNMENT) | |
| 1097 crtl->need_drap = true; | |
| 0 | 1098 |
| 1099 /* See if this machine has anything special to do for this kind of save. */ | |
| 1100 switch (save_level) | |
| 1101 { | |
| 1102 case SAVE_BLOCK: | |
| 111 | 1103 if (targetm.have_restore_stack_block ()) |
| 1104 fcn = targetm.gen_restore_stack_block; | |
| 0 | 1105 break; |
| 1106 case SAVE_FUNCTION: | |
| 111 | 1107 if (targetm.have_restore_stack_function ()) |
| 1108 fcn = targetm.gen_restore_stack_function; | |
| 0 | 1109 break; |
| 1110 case SAVE_NONLOCAL: | |
| 111 | 1111 if (targetm.have_restore_stack_nonlocal ()) |
| 1112 fcn = targetm.gen_restore_stack_nonlocal; | |
| 0 | 1113 break; |
| 1114 default: | |
| 1115 break; | |
| 1116 } | |
| 1117 | |
| 1118 if (sa != 0) | |
| 1119 { | |
| 1120 sa = validize_mem (sa); | |
| 1121 /* These clobbers prevent the scheduler from moving | |
| 1122 references to variable arrays below the code | |
| 1123 that deletes (pops) the arrays. */ | |
| 1124 emit_clobber (gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (VOIDmode))); | |
| 1125 emit_clobber (gen_rtx_MEM (BLKmode, stack_pointer_rtx)); | |
| 1126 } | |
| 1127 | |
| 1128 discard_pending_stack_adjust (); | |
| 1129 | |
|
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1130 emit_insn (fcn (stack_pointer_rtx, sa)); |
| 0 | 1131 } |
| 1132 | |
| 1133 /* Invoke emit_stack_save on the nonlocal_goto_save_area for the current | |
| 111 | 1134 function. This should be called whenever we allocate or deallocate |
| 1135 dynamic stack space. */ | |
| 0 | 1136 |
| 1137 void | |
| 1138 update_nonlocal_goto_save_area (void) | |
| 1139 { | |
| 1140 tree t_save; | |
| 1141 rtx r_save; | |
| 1142 | |
| 1143 /* The nonlocal_goto_save_area object is an array of N pointers. The | |
| 1144 first one is used for the frame pointer save; the rest are sized by | |
| 1145 STACK_SAVEAREA_MODE. Create a reference to array index 1, the first | |
| 1146 of the stack save area slots. */ | |
| 111 | 1147 t_save = build4 (ARRAY_REF, |
| 1148 TREE_TYPE (TREE_TYPE (cfun->nonlocal_goto_save_area)), | |
| 1149 cfun->nonlocal_goto_save_area, | |
| 0 | 1150 integer_one_node, NULL_TREE, NULL_TREE); |
| 1151 r_save = expand_expr (t_save, NULL_RTX, VOIDmode, EXPAND_WRITE); | |
| 1152 | |
|
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1153 emit_stack_save (SAVE_NONLOCAL, &r_save); |
| 0 | 1154 } |
| 111 | 1155 |
| 1156 /* Record a new stack level for the current function. This should be called | |
| 1157 whenever we allocate or deallocate dynamic stack space. */ | |
| 0 | 1158 |
| 111 | 1159 void |
| 1160 record_new_stack_level (void) | |
| 1161 { | |
| 1162 /* Record the new stack level for nonlocal gotos. */ | |
| 1163 if (cfun->nonlocal_goto_save_area) | |
| 1164 update_nonlocal_goto_save_area (); | |
| 1165 | |
| 1166 /* Record the new stack level for SJLJ exceptions. */ | |
| 1167 if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ) | |
| 1168 update_sjlj_context (); | |
| 1169 } | |
| 145 | 1170 |
| 111 | 1171 /* Return an rtx doing runtime alignment to REQUIRED_ALIGN on TARGET. */ |
| 145 | 1172 |
| 1173 rtx | |
| 111 | 1174 align_dynamic_address (rtx target, unsigned required_align) |
| 1175 { | |
| 1176 /* CEIL_DIV_EXPR needs to worry about the addition overflowing, | |
| 1177 but we know it can't. So add ourselves and then do | |
| 1178 TRUNC_DIV_EXPR. */ | |
| 1179 target = expand_binop (Pmode, add_optab, target, | |
| 1180 gen_int_mode (required_align / BITS_PER_UNIT - 1, | |
| 1181 Pmode), | |
| 1182 NULL_RTX, 1, OPTAB_LIB_WIDEN); | |
| 1183 target = expand_divmod (0, TRUNC_DIV_EXPR, Pmode, target, | |
| 1184 gen_int_mode (required_align / BITS_PER_UNIT, | |
| 1185 Pmode), | |
| 1186 NULL_RTX, 1); | |
| 1187 target = expand_mult (Pmode, target, | |
| 1188 gen_int_mode (required_align / BITS_PER_UNIT, | |
| 1189 Pmode), | |
| 1190 NULL_RTX, 1); | |
| 0 | 1191 |
| 111 | 1192 return target; |
| 1193 } | |
| 1194 | |
| 1195 /* Return an rtx through *PSIZE, representing the size of an area of memory to | |
| 1196 be dynamically pushed on the stack. | |
| 1197 | |
| 1198 *PSIZE is an rtx representing the size of the area. | |
|
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1199 |
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1200 SIZE_ALIGN is the alignment (in bits) that we know SIZE has. This |
| 111 | 1201 parameter may be zero. If so, a proper value will be extracted |
|
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1202 from SIZE if it is constant, otherwise BITS_PER_UNIT will be assumed. |
| 0 | 1203 |
|
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1204 REQUIRED_ALIGN is the alignment (in bits) required for the region |
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1205 of memory. |
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1206 |
| 111 | 1207 If PSTACK_USAGE_SIZE is not NULL it points to a value that is increased for |
| 1208 the additional size returned. */ | |
| 1209 void | |
| 1210 get_dynamic_stack_size (rtx *psize, unsigned size_align, | |
| 1211 unsigned required_align, | |
| 1212 HOST_WIDE_INT *pstack_usage_size) | |
| 0 | 1213 { |
| 111 | 1214 rtx size = *psize; |
|
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1215 |
| 0 | 1216 /* Ensure the size is in the proper mode. */ |
| 1217 if (GET_MODE (size) != VOIDmode && GET_MODE (size) != Pmode) | |
| 1218 size = convert_to_mode (Pmode, size, 1); | |
| 1219 | |
|
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1220 if (CONST_INT_P (size)) |
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1221 { |
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1222 unsigned HOST_WIDE_INT lsb; |
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1223 |
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1224 lsb = INTVAL (size); |
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1225 lsb &= -lsb; |
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1226 |
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1227 /* Watch out for overflow truncating to "unsigned". */ |
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1228 if (lsb > UINT_MAX / BITS_PER_UNIT) |
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1229 size_align = 1u << (HOST_BITS_PER_INT - 1); |
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1230 else |
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1231 size_align = (unsigned)lsb * BITS_PER_UNIT; |
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1232 } |
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1233 else if (size_align < BITS_PER_UNIT) |
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1234 size_align = BITS_PER_UNIT; |
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1235 |
| 0 | 1236 /* We can't attempt to minimize alignment necessary, because we don't |
| 1237 know the final value of preferred_stack_boundary yet while executing | |
| 1238 this code. */ | |
|
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1239 if (crtl->preferred_stack_boundary < PREFERRED_STACK_BOUNDARY) |
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1240 crtl->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; |
| 0 | 1241 |
| 1242 /* We will need to ensure that the address we return is aligned to | |
| 111 | 1243 REQUIRED_ALIGN. At this point in the compilation, we don't always |
| 1244 know the final value of the STACK_DYNAMIC_OFFSET used in function.c | |
| 1245 (it might depend on the size of the outgoing parameter lists, for | |
| 1246 example), so we must preventively align the value. We leave space | |
| 1247 in SIZE for the hole that might result from the alignment operation. */ | |
| 0 | 1248 |
| 131 | 1249 unsigned known_align = REGNO_POINTER_ALIGN (VIRTUAL_STACK_DYNAMIC_REGNUM); |
| 1250 if (known_align == 0) | |
| 1251 known_align = BITS_PER_UNIT; | |
| 1252 if (required_align > known_align) | |
|
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1253 { |
| 131 | 1254 unsigned extra = (required_align - known_align) / BITS_PER_UNIT; |
| 111 | 1255 size = plus_constant (Pmode, size, extra); |
| 1256 size = force_operand (size, NULL_RTX); | |
| 131 | 1257 if (size_align > known_align) |
| 1258 size_align = known_align; | |
| 111 | 1259 |
| 1260 if (flag_stack_usage_info && pstack_usage_size) | |
| 1261 *pstack_usage_size += extra; | |
|
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1262 } |
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1263 |
| 0 | 1264 /* Round the size to a multiple of the required stack alignment. |
| 111 | 1265 Since the stack is presumed to be rounded before this allocation, |
| 0 | 1266 this will maintain the required alignment. |
| 1267 | |
| 1268 If the stack grows downward, we could save an insn by subtracting | |
| 1269 SIZE from the stack pointer and then aligning the stack pointer. | |
| 1270 The problem with this is that the stack pointer may be unaligned | |
| 1271 between the execution of the subtraction and alignment insns and | |
| 1272 some machines do not allow this. Even on those that do, some | |
| 1273 signal handlers malfunction if a signal should occur between those | |
| 1274 insns. Since this is an extremely rare event, we have no reliable | |
| 1275 way of knowing which systems have this problem. So we avoid even | |
| 1276 momentarily mis-aligning the stack. */ | |
|
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1277 if (size_align % MAX_SUPPORTED_STACK_ALIGNMENT != 0) |
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1278 { |
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1279 size = round_push (size); |
| 0 | 1280 |
| 111 | 1281 if (flag_stack_usage_info && pstack_usage_size) |
|
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1282 { |
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1283 int align = crtl->preferred_stack_boundary / BITS_PER_UNIT; |
| 111 | 1284 *pstack_usage_size = |
| 1285 (*pstack_usage_size + align - 1) / align * align; | |
|
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1286 } |
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1287 } |
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1288 |
| 111 | 1289 *psize = size; |
| 1290 } | |
| 1291 | |
| 1292 /* Return the number of bytes to "protect" on the stack for -fstack-check. | |
| 1293 | |
| 1294 "protect" in the context of -fstack-check means how many bytes we | |
| 1295 should always ensure are available on the stack. More importantly | |
| 1296 this is how many bytes are skipped when probing the stack. | |
| 1297 | |
| 1298 On some targets we want to reuse the -fstack-check prologue support | |
| 1299 to give a degree of protection against stack clashing style attacks. | |
| 1300 | |
| 1301 In that scenario we do not want to skip bytes before probing as that | |
| 1302 would render the stack clash protections useless. | |
| 1303 | |
| 1304 So we never use STACK_CHECK_PROTECT directly. Instead we indirect though | |
| 1305 this helper which allows us to provide different values for | |
| 1306 -fstack-check and -fstack-clash-protection. */ | |
| 1307 HOST_WIDE_INT | |
| 1308 get_stack_check_protect (void) | |
| 1309 { | |
| 1310 if (flag_stack_clash_protection) | |
| 1311 return 0; | |
| 1312 return STACK_CHECK_PROTECT; | |
| 1313 } | |
| 1314 | |
| 1315 /* Return an rtx representing the address of an area of memory dynamically | |
| 1316 pushed on the stack. | |
| 1317 | |
| 1318 Any required stack pointer alignment is preserved. | |
| 1319 | |
| 1320 SIZE is an rtx representing the size of the area. | |
| 1321 | |
| 1322 SIZE_ALIGN is the alignment (in bits) that we know SIZE has. This | |
| 1323 parameter may be zero. If so, a proper value will be extracted | |
| 1324 from SIZE if it is constant, otherwise BITS_PER_UNIT will be assumed. | |
| 1325 | |
| 1326 REQUIRED_ALIGN is the alignment (in bits) required for the region | |
| 1327 of memory. | |
| 1328 | |
| 1329 MAX_SIZE is an upper bound for SIZE, if SIZE is not constant, or -1 if | |
| 1330 no such upper bound is known. | |
| 1331 | |
| 1332 If CANNOT_ACCUMULATE is set to TRUE, the caller guarantees that the | |
| 1333 stack space allocated by the generated code cannot be added with itself | |
| 1334 in the course of the execution of the function. It is always safe to | |
| 1335 pass FALSE here and the following criterion is sufficient in order to | |
| 1336 pass TRUE: every path in the CFG that starts at the allocation point and | |
| 1337 loops to it executes the associated deallocation code. */ | |
| 1338 | |
| 1339 rtx | |
| 1340 allocate_dynamic_stack_space (rtx size, unsigned size_align, | |
| 1341 unsigned required_align, | |
| 1342 HOST_WIDE_INT max_size, | |
| 1343 bool cannot_accumulate) | |
| 1344 { | |
| 1345 HOST_WIDE_INT stack_usage_size = -1; | |
| 1346 rtx_code_label *final_label; | |
| 1347 rtx final_target, target; | |
| 1348 | |
| 1349 /* If we're asking for zero bytes, it doesn't matter what we point | |
| 1350 to since we can't dereference it. But return a reasonable | |
| 1351 address anyway. */ | |
| 1352 if (size == const0_rtx) | |
| 1353 return virtual_stack_dynamic_rtx; | |
| 1354 | |
| 1355 /* Otherwise, show we're calling alloca or equivalent. */ | |
| 1356 cfun->calls_alloca = 1; | |
| 1357 | |
| 1358 /* If stack usage info is requested, look into the size we are passed. | |
| 1359 We need to do so this early to avoid the obfuscation that may be | |
| 1360 introduced later by the various alignment operations. */ | |
| 1361 if (flag_stack_usage_info) | |
| 1362 { | |
| 1363 if (CONST_INT_P (size)) | |
| 1364 stack_usage_size = INTVAL (size); | |
| 1365 else if (REG_P (size)) | |
| 1366 { | |
| 1367 /* Look into the last emitted insn and see if we can deduce | |
| 1368 something for the register. */ | |
| 1369 rtx_insn *insn; | |
| 1370 rtx set, note; | |
| 1371 insn = get_last_insn (); | |
| 1372 if ((set = single_set (insn)) && rtx_equal_p (SET_DEST (set), size)) | |
| 1373 { | |
| 1374 if (CONST_INT_P (SET_SRC (set))) | |
| 1375 stack_usage_size = INTVAL (SET_SRC (set)); | |
| 1376 else if ((note = find_reg_equal_equiv_note (insn)) | |
| 1377 && CONST_INT_P (XEXP (note, 0))) | |
| 1378 stack_usage_size = INTVAL (XEXP (note, 0)); | |
| 1379 } | |
| 1380 } | |
| 1381 | |
| 1382 /* If the size is not constant, try the maximum size. */ | |
| 1383 if (stack_usage_size < 0) | |
| 1384 stack_usage_size = max_size; | |
| 1385 | |
| 1386 /* If the size is still not constant, we can't say anything. */ | |
| 1387 if (stack_usage_size < 0) | |
| 1388 { | |
| 1389 current_function_has_unbounded_dynamic_stack_size = 1; | |
| 1390 stack_usage_size = 0; | |
| 1391 } | |
| 1392 } | |
| 1393 | |
| 1394 get_dynamic_stack_size (&size, size_align, required_align, &stack_usage_size); | |
| 1395 | |
|
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1396 target = gen_reg_rtx (Pmode); |
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1397 |
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1398 /* The size is supposed to be fully adjusted at this point so record it |
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1399 if stack usage info is requested. */ |
| 111 | 1400 if (flag_stack_usage_info) |
|
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1401 { |
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1402 current_function_dynamic_stack_size += stack_usage_size; |
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1403 |
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1404 /* ??? This is gross but the only safe stance in the absence |
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1405 of stack usage oriented flow analysis. */ |
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1406 if (!cannot_accumulate) |
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1407 current_function_has_unbounded_dynamic_stack_size = 1; |
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1408 } |
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1409 |
| 111 | 1410 do_pending_stack_adjust (); |
| 1411 | |
| 1412 final_label = NULL; | |
|
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1413 final_target = NULL_RTX; |
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1414 |
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1415 /* If we are splitting the stack, we need to ask the backend whether |
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1416 there is enough room on the current stack. If there isn't, or if |
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1417 the backend doesn't know how to tell is, then we need to call a |
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1418 function to allocate memory in some other way. This memory will |
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1419 be released when we release the current stack segment. The |
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1420 effect is that stack allocation becomes less efficient, but at |
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1421 least it doesn't cause a stack overflow. */ |
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1422 if (flag_split_stack) |
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1423 { |
| 111 | 1424 rtx_code_label *available_label; |
| 1425 rtx ask, space, func; | |
|
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1426 |
| 111 | 1427 available_label = NULL; |
|
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1428 |
| 111 | 1429 if (targetm.have_split_stack_space_check ()) |
|
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1430 { |
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1431 available_label = gen_label_rtx (); |
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1432 |
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1433 /* This instruction will branch to AVAILABLE_LABEL if there |
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1434 are SIZE bytes available on the stack. */ |
| 111 | 1435 emit_insn (targetm.gen_split_stack_space_check |
| 1436 (size, available_label)); | |
|
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1437 } |
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1438 |
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1439 /* The __morestack_allocate_stack_space function will allocate |
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1440 memory using malloc. If the alignment of the memory returned |
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1441 by malloc does not meet REQUIRED_ALIGN, we increase SIZE to |
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1442 make sure we allocate enough space. */ |
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1443 if (MALLOC_ABI_ALIGNMENT >= required_align) |
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1444 ask = size; |
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1445 else |
| 111 | 1446 ask = expand_binop (Pmode, add_optab, size, |
| 1447 gen_int_mode (required_align / BITS_PER_UNIT - 1, | |
| 1448 Pmode), | |
| 1449 NULL_RTX, 1, OPTAB_LIB_WIDEN); | |
|
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1450 |
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1451 func = init_one_libfunc ("__morestack_allocate_stack_space"); |
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1452 |
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1453 space = emit_library_call_value (func, target, LCT_NORMAL, Pmode, |
| 111 | 1454 ask, Pmode); |
|
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1455 |
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1456 if (available_label == NULL_RTX) |
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1457 return space; |
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1458 |
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1459 final_target = gen_reg_rtx (Pmode); |
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1460 |
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1461 emit_move_insn (final_target, space); |
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1462 |
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1463 final_label = gen_label_rtx (); |
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1464 emit_jump (final_label); |
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1465 |
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1466 emit_label (available_label); |
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1467 } |
| 0 | 1468 |
| 1469 /* We ought to be called always on the toplevel and stack ought to be aligned | |
| 1470 properly. */ | |
| 131 | 1471 gcc_assert (multiple_p (stack_pointer_delta, |
| 1472 PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT)); | |
| 0 | 1473 |
|
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1474 /* If needed, check that we have the required amount of stack. Take into |
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1475 account what has already been checked. */ |
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1476 if (STACK_CHECK_MOVING_SP) |
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1477 ; |
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1478 else if (flag_stack_check == GENERIC_STACK_CHECK) |
| 0 | 1479 probe_stack_range (STACK_OLD_CHECK_PROTECT + STACK_CHECK_MAX_FRAME_SIZE, |
| 1480 size); | |
| 1481 else if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK) | |
| 111 | 1482 probe_stack_range (get_stack_check_protect (), size); |
| 1483 | |
| 1484 /* Don't let anti_adjust_stack emit notes. */ | |
| 1485 suppress_reg_args_size = true; | |
| 0 | 1486 |
| 1487 /* Perform the required allocation from the stack. Some systems do | |
| 1488 this differently than simply incrementing/decrementing from the | |
| 1489 stack pointer, such as acquiring the space by calling malloc(). */ | |
| 111 | 1490 if (targetm.have_allocate_stack ()) |
| 0 | 1491 { |
| 145 | 1492 class expand_operand ops[2]; |
| 0 | 1493 /* We don't have to check against the predicate for operand 0 since |
| 1494 TARGET is known to be a pseudo of the proper mode, which must | |
| 111 | 1495 be valid for the operand. */ |
| 1496 create_fixed_operand (&ops[0], target); | |
| 1497 create_convert_operand_to (&ops[1], size, STACK_SIZE_MODE, true); | |
| 1498 expand_insn (targetm.code_for_allocate_stack, 2, ops); | |
| 0 | 1499 } |
| 1500 else | |
| 1501 { | |
| 131 | 1502 poly_int64 saved_stack_pointer_delta; |
|
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1503 |
| 111 | 1504 if (!STACK_GROWS_DOWNWARD) |
| 1505 emit_move_insn (target, virtual_stack_dynamic_rtx); | |
| 0 | 1506 |
| 1507 /* Check stack bounds if necessary. */ | |
| 1508 if (crtl->limit_stack) | |
| 1509 { | |
| 1510 rtx available; | |
| 111 | 1511 rtx_code_label *space_available = gen_label_rtx (); |
| 1512 if (STACK_GROWS_DOWNWARD) | |
| 1513 available = expand_binop (Pmode, sub_optab, | |
| 1514 stack_pointer_rtx, stack_limit_rtx, | |
| 1515 NULL_RTX, 1, OPTAB_WIDEN); | |
| 1516 else | |
| 1517 available = expand_binop (Pmode, sub_optab, | |
| 1518 stack_limit_rtx, stack_pointer_rtx, | |
| 1519 NULL_RTX, 1, OPTAB_WIDEN); | |
| 1520 | |
| 0 | 1521 emit_cmp_and_jump_insns (available, size, GEU, NULL_RTX, Pmode, 1, |
| 1522 space_available); | |
| 111 | 1523 if (targetm.have_trap ()) |
| 1524 emit_insn (targetm.gen_trap ()); | |
| 0 | 1525 else |
| 1526 error ("stack limits not supported on this target"); | |
| 1527 emit_barrier (); | |
| 1528 emit_label (space_available); | |
| 1529 } | |
| 1530 | |
|
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1531 saved_stack_pointer_delta = stack_pointer_delta; |
| 111 | 1532 |
|
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1533 if (flag_stack_check && STACK_CHECK_MOVING_SP) |
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1534 anti_adjust_stack_and_probe (size, false); |
| 111 | 1535 else if (flag_stack_clash_protection) |
| 1536 anti_adjust_stack_and_probe_stack_clash (size); | |
|
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1537 else |
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1538 anti_adjust_stack (size); |
| 111 | 1539 |
|
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1540 /* Even if size is constant, don't modify stack_pointer_delta. |
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1541 The constant size alloca should preserve |
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1542 crtl->preferred_stack_boundary alignment. */ |
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1543 stack_pointer_delta = saved_stack_pointer_delta; |
| 0 | 1544 |
| 111 | 1545 if (STACK_GROWS_DOWNWARD) |
| 1546 emit_move_insn (target, virtual_stack_dynamic_rtx); | |
| 0 | 1547 } |
| 1548 | |
| 111 | 1549 suppress_reg_args_size = false; |
| 1550 | |
|
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1551 /* Finish up the split stack handling. */ |
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1552 if (final_label != NULL_RTX) |
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1553 { |
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1554 gcc_assert (flag_split_stack); |
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1555 emit_move_insn (final_target, target); |
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1556 emit_label (final_label); |
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1557 target = final_target; |
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1558 } |
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1559 |
| 111 | 1560 target = align_dynamic_address (target, required_align); |
| 0 | 1561 |
|
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1562 /* Now that we've committed to a return value, mark its alignment. */ |
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1563 mark_reg_pointer (target, required_align); |
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1564 |
| 111 | 1565 /* Record the new stack level. */ |
| 1566 record_new_stack_level (); | |
| 1567 | |
| 1568 return target; | |
| 1569 } | |
| 1570 | |
| 1571 /* Return an rtx representing the address of an area of memory already | |
| 1572 statically pushed onto the stack in the virtual stack vars area. (It is | |
| 1573 assumed that the area is allocated in the function prologue.) | |
| 1574 | |
| 1575 Any required stack pointer alignment is preserved. | |
| 1576 | |
| 1577 OFFSET is the offset of the area into the virtual stack vars area. | |
| 1578 | |
| 1579 REQUIRED_ALIGN is the alignment (in bits) required for the region | |
| 1580 of memory. */ | |
| 1581 | |
| 1582 rtx | |
| 131 | 1583 get_dynamic_stack_base (poly_int64 offset, unsigned required_align) |
| 111 | 1584 { |
| 1585 rtx target; | |
| 1586 | |
| 1587 if (crtl->preferred_stack_boundary < PREFERRED_STACK_BOUNDARY) | |
| 1588 crtl->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
| 1589 | |
| 1590 target = gen_reg_rtx (Pmode); | |
| 1591 emit_move_insn (target, virtual_stack_vars_rtx); | |
| 1592 target = expand_binop (Pmode, add_optab, target, | |
| 1593 gen_int_mode (offset, Pmode), | |
| 1594 NULL_RTX, 1, OPTAB_LIB_WIDEN); | |
| 1595 target = align_dynamic_address (target, required_align); | |
| 1596 | |
| 1597 /* Now that we've committed to a return value, mark its alignment. */ | |
| 1598 mark_reg_pointer (target, required_align); | |
| 0 | 1599 |
| 1600 return target; | |
| 1601 } | |
| 1602 | |
| 1603 /* A front end may want to override GCC's stack checking by providing a | |
| 1604 run-time routine to call to check the stack, so provide a mechanism for | |
| 1605 calling that routine. */ | |
| 1606 | |
| 1607 static GTY(()) rtx stack_check_libfunc; | |
| 1608 | |
| 1609 void | |
|
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1610 set_stack_check_libfunc (const char *libfunc_name) |
| 0 | 1611 { |
|
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1612 gcc_assert (stack_check_libfunc == NULL_RTX); |
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1613 stack_check_libfunc = gen_rtx_SYMBOL_REF (Pmode, libfunc_name); |
| 145 | 1614 tree decl = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL, |
| 1615 get_identifier (libfunc_name), void_type_node); | |
| 1616 DECL_EXTERNAL (decl) = 1; | |
| 1617 SET_SYMBOL_REF_DECL (stack_check_libfunc, decl); | |
| 0 | 1618 } |
| 1619 | |
| 1620 /* Emit one stack probe at ADDRESS, an address within the stack. */ | |
| 1621 | |
|
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1622 void |
| 0 | 1623 emit_stack_probe (rtx address) |
| 1624 { | |
| 111 | 1625 if (targetm.have_probe_stack_address ()) |
| 131 | 1626 { |
| 145 | 1627 class expand_operand ops[1]; |
| 131 | 1628 insn_code icode = targetm.code_for_probe_stack_address; |
| 1629 create_address_operand (ops, address); | |
| 1630 maybe_legitimize_operands (icode, 0, 1, ops); | |
| 1631 expand_insn (icode, 1, ops); | |
| 1632 } | |
| 111 | 1633 else |
| 1634 { | |
| 1635 rtx memref = gen_rtx_MEM (word_mode, address); | |
| 0 | 1636 |
| 111 | 1637 MEM_VOLATILE_P (memref) = 1; |
| 131 | 1638 memref = validize_mem (memref); |
| 111 | 1639 |
| 1640 /* See if we have an insn to probe the stack. */ | |
| 1641 if (targetm.have_probe_stack ()) | |
| 131 | 1642 emit_insn (targetm.gen_probe_stack (memref)); |
| 111 | 1643 else |
| 131 | 1644 emit_move_insn (memref, const0_rtx); |
| 111 | 1645 } |
| 0 | 1646 } |
| 1647 | |
| 1648 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive. | |
|
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1649 FIRST is a constant and size is a Pmode RTX. These are offsets from |
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1650 the current stack pointer. STACK_GROWS_DOWNWARD says whether to add |
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1651 or subtract them from the stack pointer. */ |
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1652 |
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1653 #define PROBE_INTERVAL (1 << STACK_CHECK_PROBE_INTERVAL_EXP) |
| 0 | 1654 |
| 111 | 1655 #if STACK_GROWS_DOWNWARD |
| 0 | 1656 #define STACK_GROW_OP MINUS |
|
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1657 #define STACK_GROW_OPTAB sub_optab |
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1658 #define STACK_GROW_OFF(off) -(off) |
| 0 | 1659 #else |
| 1660 #define STACK_GROW_OP PLUS | |
|
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1661 #define STACK_GROW_OPTAB add_optab |
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1662 #define STACK_GROW_OFF(off) (off) |
| 0 | 1663 #endif |
| 1664 | |
| 1665 void | |
| 1666 probe_stack_range (HOST_WIDE_INT first, rtx size) | |
| 1667 { | |
| 1668 /* First ensure SIZE is Pmode. */ | |
| 1669 if (GET_MODE (size) != VOIDmode && GET_MODE (size) != Pmode) | |
| 1670 size = convert_to_mode (Pmode, size, 1); | |
| 1671 | |
|
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1672 /* Next see if we have a function to check the stack. */ |
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1673 if (stack_check_libfunc) |
| 0 | 1674 { |
|
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1675 rtx addr = memory_address (Pmode, |
| 0 | 1676 gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, |
| 1677 stack_pointer_rtx, | |
| 111 | 1678 plus_constant (Pmode, |
| 1679 size, first))); | |
| 1680 emit_library_call (stack_check_libfunc, LCT_THROW, VOIDmode, | |
| 1681 addr, Pmode); | |
| 0 | 1682 } |
| 1683 | |
|
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1684 /* Next see if we have an insn to check the stack. */ |
| 111 | 1685 else if (targetm.have_check_stack ()) |
| 0 | 1686 { |
| 145 | 1687 class expand_operand ops[1]; |
|
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1688 rtx addr = memory_address (Pmode, |
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1689 gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, |
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1690 stack_pointer_rtx, |
| 111 | 1691 plus_constant (Pmode, |
| 1692 size, first))); | |
| 1693 bool success; | |
| 1694 create_input_operand (&ops[0], addr, Pmode); | |
| 1695 success = maybe_expand_insn (targetm.code_for_check_stack, 1, ops); | |
| 1696 gcc_assert (success); | |
| 0 | 1697 } |
| 1698 | |
|
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1699 /* Otherwise we have to generate explicit probes. If we have a constant |
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1700 small number of them to generate, that's the easy case. */ |
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1701 else if (CONST_INT_P (size) && INTVAL (size) < 7 * PROBE_INTERVAL) |
| 0 | 1702 { |
|
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1703 HOST_WIDE_INT isize = INTVAL (size), i; |
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1704 rtx addr; |
| 0 | 1705 |
|
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1706 /* Probe at FIRST + N * PROBE_INTERVAL for values of N from 1 until |
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1707 it exceeds SIZE. If only one probe is needed, this will not |
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1708 generate any code. Then probe at FIRST + SIZE. */ |
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1709 for (i = PROBE_INTERVAL; i < isize; i += PROBE_INTERVAL) |
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1710 { |
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1711 addr = memory_address (Pmode, |
| 111 | 1712 plus_constant (Pmode, stack_pointer_rtx, |
|
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1713 STACK_GROW_OFF (first + i))); |
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1714 emit_stack_probe (addr); |
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1715 } |
| 0 | 1716 |
|
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1717 addr = memory_address (Pmode, |
| 111 | 1718 plus_constant (Pmode, stack_pointer_rtx, |
|
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1719 STACK_GROW_OFF (first + isize))); |
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1720 emit_stack_probe (addr); |
| 0 | 1721 } |
| 1722 | |
|
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1723 /* In the variable case, do the same as above, but in a loop. Note that we |
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1724 must be extra careful with variables wrapping around because we might be |
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1725 at the very top (or the very bottom) of the address space and we have to |
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1726 be able to handle this case properly; in particular, we use an equality |
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1727 test for the loop condition. */ |
| 0 | 1728 else |
| 1729 { | |
|
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1730 rtx rounded_size, rounded_size_op, test_addr, last_addr, temp; |
| 111 | 1731 rtx_code_label *loop_lab = gen_label_rtx (); |
| 1732 rtx_code_label *end_lab = gen_label_rtx (); | |
|
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1733 |
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1734 /* Step 1: round SIZE to the previous multiple of the interval. */ |
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1735 |
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1736 /* ROUNDED_SIZE = SIZE & -PROBE_INTERVAL */ |
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1737 rounded_size |
| 111 | 1738 = simplify_gen_binary (AND, Pmode, size, |
| 1739 gen_int_mode (-PROBE_INTERVAL, Pmode)); | |
|
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1740 rounded_size_op = force_operand (rounded_size, NULL_RTX); |
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1741 |
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1742 |
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1743 /* Step 2: compute initial and final value of the loop counter. */ |
| 0 | 1744 |
|
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1745 /* TEST_ADDR = SP + FIRST. */ |
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1746 test_addr = force_operand (gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, |
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1747 stack_pointer_rtx, |
| 111 | 1748 gen_int_mode (first, Pmode)), |
| 1749 NULL_RTX); | |
|
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1750 |
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1751 /* LAST_ADDR = SP + FIRST + ROUNDED_SIZE. */ |
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1752 last_addr = force_operand (gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, |
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1753 test_addr, |
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1754 rounded_size_op), NULL_RTX); |
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1755 |
| 0 | 1756 |
|
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1757 /* Step 3: the loop |
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1758 |
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1759 while (TEST_ADDR != LAST_ADDR) |
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1760 { |
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1761 TEST_ADDR = TEST_ADDR + PROBE_INTERVAL |
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1762 probe at TEST_ADDR |
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1763 } |
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1764 |
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1765 probes at FIRST + N * PROBE_INTERVAL for values of N from 1 |
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1766 until it is equal to ROUNDED_SIZE. */ |
| 0 | 1767 |
| 1768 emit_label (loop_lab); | |
| 1769 | |
|
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1770 /* Jump to END_LAB if TEST_ADDR == LAST_ADDR. */ |
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1771 emit_cmp_and_jump_insns (test_addr, last_addr, EQ, NULL_RTX, Pmode, 1, |
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1772 end_lab); |
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1773 |
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1774 /* TEST_ADDR = TEST_ADDR + PROBE_INTERVAL. */ |
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1775 temp = expand_binop (Pmode, STACK_GROW_OPTAB, test_addr, |
| 111 | 1776 gen_int_mode (PROBE_INTERVAL, Pmode), test_addr, |
| 0 | 1777 1, OPTAB_WIDEN); |
| 1778 | |
| 1779 gcc_assert (temp == test_addr); | |
| 1780 | |
|
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1781 /* Probe at TEST_ADDR. */ |
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1782 emit_stack_probe (test_addr); |
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1783 |
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1784 emit_jump (loop_lab); |
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1785 |
| 0 | 1786 emit_label (end_lab); |
| 1787 | |
|
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1788 |
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1789 /* Step 4: probe at FIRST + SIZE if we cannot assert at compile-time |
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1790 that SIZE is equal to ROUNDED_SIZE. */ |
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1791 |
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1792 /* TEMP = SIZE - ROUNDED_SIZE. */ |
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1793 temp = simplify_gen_binary (MINUS, Pmode, size, rounded_size); |
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1794 if (temp != const0_rtx) |
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1795 { |
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1796 rtx addr; |
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1797 |
|
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1798 if (CONST_INT_P (temp)) |
|
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1799 { |
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1800 /* Use [base + disp} addressing mode if supported. */ |
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1801 HOST_WIDE_INT offset = INTVAL (temp); |
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1802 addr = memory_address (Pmode, |
| 111 | 1803 plus_constant (Pmode, last_addr, |
|
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1804 STACK_GROW_OFF (offset))); |
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1805 } |
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1806 else |
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1807 { |
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1808 /* Manual CSE if the difference is not known at compile-time. */ |
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1809 temp = gen_rtx_MINUS (Pmode, size, rounded_size_op); |
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1810 addr = memory_address (Pmode, |
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1811 gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, |
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1812 last_addr, temp)); |
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1813 } |
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1814 |
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1815 emit_stack_probe (addr); |
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1816 } |
| 0 | 1817 } |
| 111 | 1818 |
| 1819 /* Make sure nothing is scheduled before we are done. */ | |
| 1820 emit_insn (gen_blockage ()); | |
| 0 | 1821 } |
|
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1822 |
| 111 | 1823 /* Compute parameters for stack clash probing a dynamic stack |
| 1824 allocation of SIZE bytes. | |
| 1825 | |
| 1826 We compute ROUNDED_SIZE, LAST_ADDR, RESIDUAL and PROBE_INTERVAL. | |
| 1827 | |
| 1828 Additionally we conditionally dump the type of probing that will | |
| 1829 be needed given the values computed. */ | |
| 1830 | |
| 1831 void | |
| 1832 compute_stack_clash_protection_loop_data (rtx *rounded_size, rtx *last_addr, | |
| 1833 rtx *residual, | |
| 1834 HOST_WIDE_INT *probe_interval, | |
| 1835 rtx size) | |
| 1836 { | |
| 1837 /* Round SIZE down to STACK_CLASH_PROTECTION_PROBE_INTERVAL */ | |
| 1838 *probe_interval | |
| 145 | 1839 = 1 << param_stack_clash_protection_probe_interval; |
| 111 | 1840 *rounded_size = simplify_gen_binary (AND, Pmode, size, |
| 1841 GEN_INT (-*probe_interval)); | |
| 1842 | |
| 1843 /* Compute the value of the stack pointer for the last iteration. | |
| 1844 It's just SP + ROUNDED_SIZE. */ | |
| 1845 rtx rounded_size_op = force_operand (*rounded_size, NULL_RTX); | |
| 1846 *last_addr = force_operand (gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, | |
| 1847 stack_pointer_rtx, | |
| 1848 rounded_size_op), | |
| 1849 NULL_RTX); | |
| 1850 | |
| 1851 /* Compute any residuals not allocated by the loop above. Residuals | |
| 1852 are just the ROUNDED_SIZE - SIZE. */ | |
| 1853 *residual = simplify_gen_binary (MINUS, Pmode, size, *rounded_size); | |
| 1854 | |
| 1855 /* Dump key information to make writing tests easy. */ | |
| 1856 if (dump_file) | |
| 1857 { | |
| 1858 if (*rounded_size == CONST0_RTX (Pmode)) | |
| 1859 fprintf (dump_file, | |
| 1860 "Stack clash skipped dynamic allocation and probing loop.\n"); | |
| 1861 else if (CONST_INT_P (*rounded_size) | |
| 1862 && INTVAL (*rounded_size) <= 4 * *probe_interval) | |
| 1863 fprintf (dump_file, | |
| 1864 "Stack clash dynamic allocation and probing inline.\n"); | |
| 1865 else if (CONST_INT_P (*rounded_size)) | |
| 1866 fprintf (dump_file, | |
| 1867 "Stack clash dynamic allocation and probing in " | |
| 1868 "rotated loop.\n"); | |
| 1869 else | |
| 1870 fprintf (dump_file, | |
| 1871 "Stack clash dynamic allocation and probing in loop.\n"); | |
| 1872 | |
| 1873 if (*residual != CONST0_RTX (Pmode)) | |
| 1874 fprintf (dump_file, | |
| 1875 "Stack clash dynamic allocation and probing residuals.\n"); | |
| 1876 else | |
| 1877 fprintf (dump_file, | |
| 1878 "Stack clash skipped dynamic allocation and " | |
| 1879 "probing residuals.\n"); | |
| 1880 } | |
| 1881 } | |
| 1882 | |
| 1883 /* Emit the start of an allocate/probe loop for stack | |
| 1884 clash protection. | |
| 1885 | |
| 1886 LOOP_LAB and END_LAB are returned for use when we emit the | |
| 1887 end of the loop. | |
| 1888 | |
| 1889 LAST addr is the value for SP which stops the loop. */ | |
| 1890 void | |
| 1891 emit_stack_clash_protection_probe_loop_start (rtx *loop_lab, | |
| 1892 rtx *end_lab, | |
| 1893 rtx last_addr, | |
| 1894 bool rotated) | |
| 1895 { | |
| 1896 /* Essentially we want to emit any setup code, the top of loop | |
| 1897 label and the comparison at the top of the loop. */ | |
| 1898 *loop_lab = gen_label_rtx (); | |
| 1899 *end_lab = gen_label_rtx (); | |
| 1900 | |
| 1901 emit_label (*loop_lab); | |
| 1902 if (!rotated) | |
| 1903 emit_cmp_and_jump_insns (stack_pointer_rtx, last_addr, EQ, NULL_RTX, | |
| 1904 Pmode, 1, *end_lab); | |
| 1905 } | |
| 1906 | |
| 1907 /* Emit the end of a stack clash probing loop. | |
| 1908 | |
| 1909 This consists of just the jump back to LOOP_LAB and | |
| 1910 emitting END_LOOP after the loop. */ | |
| 1911 | |
| 1912 void | |
| 1913 emit_stack_clash_protection_probe_loop_end (rtx loop_lab, rtx end_loop, | |
| 1914 rtx last_addr, bool rotated) | |
| 1915 { | |
| 1916 if (rotated) | |
| 1917 emit_cmp_and_jump_insns (stack_pointer_rtx, last_addr, NE, NULL_RTX, | |
| 1918 Pmode, 1, loop_lab); | |
| 1919 else | |
| 1920 emit_jump (loop_lab); | |
| 1921 | |
| 1922 emit_label (end_loop); | |
| 1923 | |
| 1924 } | |
| 1925 | |
| 1926 /* Adjust the stack pointer by minus SIZE (an rtx for a number of bytes) | |
| 1927 while probing it. This pushes when SIZE is positive. SIZE need not | |
| 1928 be constant. | |
| 1929 | |
| 1930 This is subtly different than anti_adjust_stack_and_probe to try and | |
| 1931 prevent stack-clash attacks | |
| 1932 | |
| 1933 1. It must assume no knowledge of the probing state, any allocation | |
| 1934 must probe. | |
| 1935 | |
| 1936 Consider the case of a 1 byte alloca in a loop. If the sum of the | |
| 1937 allocations is large, then this could be used to jump the guard if | |
| 1938 probes were not emitted. | |
| 1939 | |
| 1940 2. It never skips probes, whereas anti_adjust_stack_and_probe will | |
| 1941 skip probes on the first couple PROBE_INTERVALs on the assumption | |
| 1942 they're done elsewhere. | |
| 1943 | |
| 1944 3. It only allocates and probes SIZE bytes, it does not need to | |
| 1945 allocate/probe beyond that because this probing style does not | |
| 1946 guarantee signal handling capability if the guard is hit. */ | |
| 1947 | |
| 1948 static void | |
| 1949 anti_adjust_stack_and_probe_stack_clash (rtx size) | |
| 1950 { | |
| 1951 /* First ensure SIZE is Pmode. */ | |
| 1952 if (GET_MODE (size) != VOIDmode && GET_MODE (size) != Pmode) | |
| 1953 size = convert_to_mode (Pmode, size, 1); | |
| 1954 | |
| 1955 /* We can get here with a constant size on some targets. */ | |
| 1956 rtx rounded_size, last_addr, residual; | |
| 131 | 1957 HOST_WIDE_INT probe_interval, probe_range; |
| 1958 bool target_probe_range_p = false; | |
| 111 | 1959 compute_stack_clash_protection_loop_data (&rounded_size, &last_addr, |
| 1960 &residual, &probe_interval, size); | |
| 1961 | |
| 131 | 1962 /* Get the back-end specific probe ranges. */ |
| 1963 probe_range = targetm.stack_clash_protection_alloca_probe_range (); | |
| 1964 target_probe_range_p = probe_range != 0; | |
| 1965 gcc_assert (probe_range >= 0); | |
| 1966 | |
| 1967 /* If no back-end specific range defined, default to the top of the newly | |
| 1968 allocated range. */ | |
| 1969 if (probe_range == 0) | |
| 1970 probe_range = probe_interval - GET_MODE_SIZE (word_mode); | |
| 1971 | |
| 111 | 1972 if (rounded_size != CONST0_RTX (Pmode)) |
| 1973 { | |
| 1974 if (CONST_INT_P (rounded_size) | |
| 1975 && INTVAL (rounded_size) <= 4 * probe_interval) | |
| 1976 { | |
| 1977 for (HOST_WIDE_INT i = 0; | |
| 1978 i < INTVAL (rounded_size); | |
| 1979 i += probe_interval) | |
| 1980 { | |
| 1981 anti_adjust_stack (GEN_INT (probe_interval)); | |
| 1982 /* The prologue does not probe residuals. Thus the offset | |
| 1983 here to probe just beyond what the prologue had already | |
| 1984 allocated. */ | |
| 1985 emit_stack_probe (plus_constant (Pmode, stack_pointer_rtx, | |
| 131 | 1986 probe_range)); |
| 1987 | |
| 111 | 1988 emit_insn (gen_blockage ()); |
| 1989 } | |
| 1990 } | |
| 1991 else | |
| 1992 { | |
| 1993 rtx loop_lab, end_loop; | |
| 1994 bool rotate_loop = CONST_INT_P (rounded_size); | |
| 1995 emit_stack_clash_protection_probe_loop_start (&loop_lab, &end_loop, | |
| 1996 last_addr, rotate_loop); | |
| 1997 | |
| 1998 anti_adjust_stack (GEN_INT (probe_interval)); | |
| 1999 | |
| 2000 /* The prologue does not probe residuals. Thus the offset here | |
| 131 | 2001 to probe just beyond what the prologue had already |
| 2002 allocated. */ | |
| 111 | 2003 emit_stack_probe (plus_constant (Pmode, stack_pointer_rtx, |
| 131 | 2004 probe_range)); |
| 111 | 2005 |
| 2006 emit_stack_clash_protection_probe_loop_end (loop_lab, end_loop, | |
| 2007 last_addr, rotate_loop); | |
| 2008 emit_insn (gen_blockage ()); | |
| 2009 } | |
| 2010 } | |
| 2011 | |
| 2012 if (residual != CONST0_RTX (Pmode)) | |
| 2013 { | |
| 131 | 2014 rtx label = NULL_RTX; |
| 2015 /* RESIDUAL could be zero at runtime and in that case *sp could | |
| 2016 hold live data. Furthermore, we do not want to probe into the | |
| 2017 red zone. | |
| 2018 | |
| 2019 If TARGET_PROBE_RANGE_P then the target has promised it's safe to | |
| 2020 probe at offset 0. In which case we no longer have to check for | |
| 2021 RESIDUAL == 0. However we still need to probe at the right offset | |
| 2022 when RESIDUAL > PROBE_RANGE, in which case we probe at PROBE_RANGE. | |
| 2023 | |
| 2024 If !TARGET_PROBE_RANGE_P then go ahead and just guard the probe at *sp | |
| 2025 on RESIDUAL != 0 at runtime if RESIDUAL is not a compile time constant. | |
| 2026 */ | |
| 111 | 2027 anti_adjust_stack (residual); |
| 2028 | |
| 131 | 2029 if (!CONST_INT_P (residual)) |
| 111 | 2030 { |
| 131 | 2031 label = gen_label_rtx (); |
| 2032 rtx_code op = target_probe_range_p ? LT : EQ; | |
| 2033 rtx probe_cmp_value = target_probe_range_p | |
| 2034 ? gen_rtx_CONST_INT (GET_MODE (residual), probe_range) | |
| 2035 : CONST0_RTX (GET_MODE (residual)); | |
| 2036 | |
| 2037 if (target_probe_range_p) | |
| 2038 emit_stack_probe (stack_pointer_rtx); | |
| 2039 | |
| 2040 emit_cmp_and_jump_insns (residual, probe_cmp_value, | |
| 2041 op, NULL_RTX, Pmode, 1, label); | |
| 2042 } | |
| 2043 | |
| 2044 rtx x = NULL_RTX; | |
| 2045 | |
| 2046 /* If RESIDUAL isn't a constant and TARGET_PROBE_RANGE_P then we probe up | |
| 2047 by the ABI defined safe value. */ | |
| 2048 if (!CONST_INT_P (residual) && target_probe_range_p) | |
| 2049 x = GEN_INT (probe_range); | |
| 2050 /* If RESIDUAL is a constant but smaller than the ABI defined safe value, | |
| 2051 we still want to probe up, but the safest amount if a word. */ | |
| 2052 else if (target_probe_range_p) | |
| 2053 { | |
| 2054 if (INTVAL (residual) <= probe_range) | |
| 2055 x = GEN_INT (GET_MODE_SIZE (word_mode)); | |
| 2056 else | |
| 2057 x = GEN_INT (probe_range); | |
| 111 | 2058 } |
| 2059 else | |
| 131 | 2060 /* If nothing else, probe at the top of the new allocation. */ |
| 2061 x = plus_constant (Pmode, residual, -GET_MODE_SIZE (word_mode)); | |
| 2062 | |
| 2063 emit_stack_probe (gen_rtx_PLUS (Pmode, stack_pointer_rtx, x)); | |
| 2064 | |
| 2065 emit_insn (gen_blockage ()); | |
| 2066 if (!CONST_INT_P (residual)) | |
| 2067 emit_label (label); | |
| 111 | 2068 } |
| 2069 } | |
| 2070 | |
| 2071 | |
|
55
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2072 /* Adjust the stack pointer by minus SIZE (an rtx for a number of bytes) |
|
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|
2073 while probing it. This pushes when SIZE is positive. SIZE need not |
|
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|
2074 be constant. If ADJUST_BACK is true, adjust back the stack pointer |
|
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|
2075 by plus SIZE at the end. */ |
|
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|
2076 |
|
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|
2077 void |
|
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|
2078 anti_adjust_stack_and_probe (rtx size, bool adjust_back) |
|
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|
2079 { |
|
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|
2080 /* We skip the probe for the first interval + a small dope of 4 words and |
|
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|
2081 probe that many bytes past the specified size to maintain a protection |
|
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|
2082 area at the botton of the stack. */ |
|
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|
2083 const int dope = 4 * UNITS_PER_WORD; |
|
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|
2084 |
|
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2085 /* First ensure SIZE is Pmode. */ |
|
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|
2086 if (GET_MODE (size) != VOIDmode && GET_MODE (size) != Pmode) |
|
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2087 size = convert_to_mode (Pmode, size, 1); |
|
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|
2088 |
|
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|
2089 /* If we have a constant small number of probes to generate, that's the |
|
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2090 easy case. */ |
|
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|
2091 if (CONST_INT_P (size) && INTVAL (size) < 7 * PROBE_INTERVAL) |
|
55
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|
2092 { |
|
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|
2093 HOST_WIDE_INT isize = INTVAL (size), i; |
|
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|
2094 bool first_probe = true; |
|
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|
2095 |
|
67
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diff
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|
2096 /* Adjust SP and probe at PROBE_INTERVAL + N * PROBE_INTERVAL for |
|
55
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|
2097 values of N from 1 until it exceeds SIZE. If only one probe is |
|
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diff
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|
2098 needed, this will not generate any code. Then adjust and probe |
|
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|
2099 to PROBE_INTERVAL + SIZE. */ |
|
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|
2100 for (i = PROBE_INTERVAL; i < isize; i += PROBE_INTERVAL) |
|
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|
2101 { |
|
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|
2102 if (first_probe) |
|
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|
2103 { |
|
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|
2104 anti_adjust_stack (GEN_INT (2 * PROBE_INTERVAL + dope)); |
|
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|
2105 first_probe = false; |
|
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|
2106 } |
|
77e2b8dfacca
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|
2107 else |
|
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diff
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|
2108 anti_adjust_stack (GEN_INT (PROBE_INTERVAL)); |
|
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|
2109 emit_stack_probe (stack_pointer_rtx); |
|
77e2b8dfacca
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|
2110 } |
|
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|
2111 |
|
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diff
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|
2112 if (first_probe) |
| 111 | 2113 anti_adjust_stack (plus_constant (Pmode, size, PROBE_INTERVAL + dope)); |
|
55
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|
2114 else |
| 111 | 2115 anti_adjust_stack (plus_constant (Pmode, size, PROBE_INTERVAL - i)); |
|
55
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|
2116 emit_stack_probe (stack_pointer_rtx); |
|
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diff
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|
2117 } |
|
77e2b8dfacca
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0
diff
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|
2118 |
|
77e2b8dfacca
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0
diff
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|
2119 /* In the variable case, do the same as above, but in a loop. Note that we |
|
77e2b8dfacca
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0
diff
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|
2120 must be extra careful with variables wrapping around because we might be |
|
77e2b8dfacca
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0
diff
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|
2121 at the very top (or the very bottom) of the address space and we have to |
|
77e2b8dfacca
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0
diff
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|
2122 be able to handle this case properly; in particular, we use an equality |
|
77e2b8dfacca
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0
diff
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|
2123 test for the loop condition. */ |
|
77e2b8dfacca
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0
diff
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|
2124 else |
|
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0
diff
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|
2125 { |
|
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0
diff
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|
2126 rtx rounded_size, rounded_size_op, last_addr, temp; |
| 111 | 2127 rtx_code_label *loop_lab = gen_label_rtx (); |
| 2128 rtx_code_label *end_lab = gen_label_rtx (); | |
|
55
77e2b8dfacca
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0
diff
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|
2129 |
|
77e2b8dfacca
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0
diff
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|
2130 |
|
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0
diff
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|
2131 /* Step 1: round SIZE to the previous multiple of the interval. */ |
|
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0
diff
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|
2132 |
|
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0
diff
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|
2133 /* ROUNDED_SIZE = SIZE & -PROBE_INTERVAL */ |
|
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diff
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|
2134 rounded_size |
| 111 | 2135 = simplify_gen_binary (AND, Pmode, size, |
| 2136 gen_int_mode (-PROBE_INTERVAL, Pmode)); | |
|
55
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|
2137 rounded_size_op = force_operand (rounded_size, NULL_RTX); |
|
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|
2138 |
|
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0
diff
changeset
|
2139 |
|
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0
diff
changeset
|
2140 /* Step 2: compute initial and final value of the loop counter. */ |
|
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|
2141 |
|
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|
2142 /* SP = SP_0 + PROBE_INTERVAL. */ |
|
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|
2143 anti_adjust_stack (GEN_INT (PROBE_INTERVAL + dope)); |
|
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|
2144 |
|
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diff
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|
2145 /* LAST_ADDR = SP_0 + PROBE_INTERVAL + ROUNDED_SIZE. */ |
|
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diff
changeset
|
2146 last_addr = force_operand (gen_rtx_fmt_ee (STACK_GROW_OP, Pmode, |
|
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0
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changeset
|
2147 stack_pointer_rtx, |
|
77e2b8dfacca
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diff
changeset
|
2148 rounded_size_op), NULL_RTX); |
|
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0
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|
2149 |
|
77e2b8dfacca
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0
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changeset
|
2150 |
|
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diff
changeset
|
2151 /* Step 3: the loop |
|
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|
2152 |
|
67
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55
diff
changeset
|
2153 while (SP != LAST_ADDR) |
|
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55
diff
changeset
|
2154 { |
|
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diff
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|
2155 SP = SP + PROBE_INTERVAL |
|
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diff
changeset
|
2156 probe at SP |
|
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55
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changeset
|
2157 } |
|
55
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changeset
|
2158 |
|
67
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55
diff
changeset
|
2159 adjusts SP and probes at PROBE_INTERVAL + N * PROBE_INTERVAL for |
|
55
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changeset
|
2160 values of N from 1 until it is equal to ROUNDED_SIZE. */ |
|
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changeset
|
2161 |
|
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diff
changeset
|
2162 emit_label (loop_lab); |
|
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changeset
|
2163 |
|
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|
2164 /* Jump to END_LAB if SP == LAST_ADDR. */ |
|
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|
2165 emit_cmp_and_jump_insns (stack_pointer_rtx, last_addr, EQ, NULL_RTX, |
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2166 Pmode, 1, end_lab); |
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2167 |
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2168 /* SP = SP + PROBE_INTERVAL and probe at SP. */ |
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2169 anti_adjust_stack (GEN_INT (PROBE_INTERVAL)); |
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2170 emit_stack_probe (stack_pointer_rtx); |
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2171 |
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2172 emit_jump (loop_lab); |
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2173 |
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2174 emit_label (end_lab); |
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2175 |
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2176 |
|
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2177 /* Step 4: adjust SP and probe at PROBE_INTERVAL + SIZE if we cannot |
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2178 assert at compile-time that SIZE is equal to ROUNDED_SIZE. */ |
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2179 |
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2180 /* TEMP = SIZE - ROUNDED_SIZE. */ |
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2181 temp = simplify_gen_binary (MINUS, Pmode, size, rounded_size); |
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2182 if (temp != const0_rtx) |
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2183 { |
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2184 /* Manual CSE if the difference is not known at compile-time. */ |
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2185 if (GET_CODE (temp) != CONST_INT) |
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2186 temp = gen_rtx_MINUS (Pmode, size, rounded_size_op); |
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2187 anti_adjust_stack (temp); |
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2188 emit_stack_probe (stack_pointer_rtx); |
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2189 } |
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2190 } |
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2191 |
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2192 /* Adjust back and account for the additional first interval. */ |
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2193 if (adjust_back) |
| 111 | 2194 adjust_stack (plus_constant (Pmode, size, PROBE_INTERVAL + dope)); |
|
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2195 else |
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2196 adjust_stack (GEN_INT (PROBE_INTERVAL + dope)); |
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2197 } |
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2198 |
| 0 | 2199 /* Return an rtx representing the register or memory location |
| 2200 in which a scalar value of data type VALTYPE | |
| 2201 was returned by a function call to function FUNC. | |
| 2202 FUNC is a FUNCTION_DECL, FNTYPE a FUNCTION_TYPE node if the precise | |
| 2203 function is known, otherwise 0. | |
| 2204 OUTGOING is 1 if on a machine with register windows this function | |
| 2205 should return the register in which the function will put its result | |
| 2206 and 0 otherwise. */ | |
| 2207 | |
| 2208 rtx | |
| 2209 hard_function_value (const_tree valtype, const_tree func, const_tree fntype, | |
| 2210 int outgoing ATTRIBUTE_UNUSED) | |
| 2211 { | |
| 2212 rtx val; | |
| 2213 | |
| 2214 val = targetm.calls.function_value (valtype, func ? func : fntype, outgoing); | |
| 2215 | |
| 2216 if (REG_P (val) | |
| 2217 && GET_MODE (val) == BLKmode) | |
| 2218 { | |
| 131 | 2219 unsigned HOST_WIDE_INT bytes = arg_int_size_in_bytes (valtype); |
| 111 | 2220 opt_scalar_int_mode tmpmode; |
| 0 | 2221 |
| 2222 /* int_size_in_bytes can return -1. We don't need a check here | |
| 2223 since the value of bytes will then be large enough that no | |
| 2224 mode will match anyway. */ | |
| 2225 | |
| 111 | 2226 FOR_EACH_MODE_IN_CLASS (tmpmode, MODE_INT) |
| 0 | 2227 { |
| 2228 /* Have we found a large enough mode? */ | |
| 111 | 2229 if (GET_MODE_SIZE (tmpmode.require ()) >= bytes) |
| 0 | 2230 break; |
| 2231 } | |
| 2232 | |
| 111 | 2233 PUT_MODE (val, tmpmode.require ()); |
| 0 | 2234 } |
| 2235 return val; | |
| 2236 } | |
| 2237 | |
| 2238 /* Return an rtx representing the register or memory location | |
| 2239 in which a scalar value of mode MODE was returned by a library call. */ | |
| 2240 | |
| 2241 rtx | |
| 111 | 2242 hard_libcall_value (machine_mode mode, rtx fun) |
| 0 | 2243 { |
|
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2244 return targetm.calls.libcall_value (mode, fun); |
| 0 | 2245 } |
| 2246 | |
| 2247 /* Look up the tree code for a given rtx code | |
| 111 | 2248 to provide the arithmetic operation for real_arithmetic. |
| 0 | 2249 The function returns an int because the caller may not know |
| 2250 what `enum tree_code' means. */ | |
| 2251 | |
| 2252 int | |
| 2253 rtx_to_tree_code (enum rtx_code code) | |
| 2254 { | |
| 2255 enum tree_code tcode; | |
| 2256 | |
| 2257 switch (code) | |
| 2258 { | |
| 2259 case PLUS: | |
| 2260 tcode = PLUS_EXPR; | |
| 2261 break; | |
| 2262 case MINUS: | |
| 2263 tcode = MINUS_EXPR; | |
| 2264 break; | |
| 2265 case MULT: | |
| 2266 tcode = MULT_EXPR; | |
| 2267 break; | |
| 2268 case DIV: | |
| 2269 tcode = RDIV_EXPR; | |
| 2270 break; | |
| 2271 case SMIN: | |
| 2272 tcode = MIN_EXPR; | |
| 2273 break; | |
| 2274 case SMAX: | |
| 2275 tcode = MAX_EXPR; | |
| 2276 break; | |
| 2277 default: | |
| 2278 tcode = LAST_AND_UNUSED_TREE_CODE; | |
| 2279 break; | |
| 2280 } | |
| 2281 return ((int) tcode); | |
| 2282 } | |
| 2283 | |
| 2284 #include "gt-explow.h" |