Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-address.c @ 56:3c8a44c06a95
Added tag gcc-4.4.5 for changeset 77e2b8dfacca
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:41:23 +0900 |
| parents | 77e2b8dfacca |
| children | b7f97abdc517 |
| rev | line source |
|---|---|
| 0 | 1 /* Memory address lowering and addressing mode selection. |
| 2 Copyright (C) 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. | |
|
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3 |
| 0 | 4 This file is part of GCC. |
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5 |
| 0 | 6 GCC is free software; you can redistribute it and/or modify it |
| 7 under the terms of the GNU General Public License as published by the | |
| 8 Free Software Foundation; either version 3, or (at your option) any | |
| 9 later version. | |
|
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10 |
| 0 | 11 GCC is distributed in the hope that it will be useful, but WITHOUT |
| 12 ANY 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. | |
|
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15 |
| 0 | 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 /* Utility functions for manipulation with TARGET_MEM_REFs -- tree expressions | |
| 21 that directly map to addressing modes of the target. */ | |
| 22 | |
| 23 #include "config.h" | |
| 24 #include "system.h" | |
| 25 #include "coretypes.h" | |
| 26 #include "tm.h" | |
| 27 #include "tree.h" | |
| 28 #include "rtl.h" | |
| 29 #include "tm_p.h" | |
| 30 #include "hard-reg-set.h" | |
| 31 #include "basic-block.h" | |
| 32 #include "output.h" | |
| 33 #include "diagnostic.h" | |
| 34 #include "tree-flow.h" | |
| 35 #include "tree-dump.h" | |
| 36 #include "tree-pass.h" | |
| 37 #include "timevar.h" | |
| 38 #include "flags.h" | |
| 39 #include "tree-inline.h" | |
| 40 #include "insn-config.h" | |
| 41 #include "recog.h" | |
| 42 #include "expr.h" | |
| 43 #include "ggc.h" | |
| 44 #include "tree-affine.h" | |
|
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45 #include "target.h" |
| 0 | 46 |
| 47 /* TODO -- handling of symbols (according to Richard Hendersons | |
| 48 comments, http://gcc.gnu.org/ml/gcc-patches/2005-04/msg00949.html): | |
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49 |
| 0 | 50 There are at least 5 different kinds of symbols that we can run up against: |
| 51 | |
| 52 (1) binds_local_p, small data area. | |
| 53 (2) binds_local_p, eg local statics | |
| 54 (3) !binds_local_p, eg global variables | |
| 55 (4) thread local, local_exec | |
| 56 (5) thread local, !local_exec | |
| 57 | |
| 58 Now, (1) won't appear often in an array context, but it certainly can. | |
| 59 All you have to do is set -GN high enough, or explicitly mark any | |
| 60 random object __attribute__((section (".sdata"))). | |
| 61 | |
| 62 All of these affect whether or not a symbol is in fact a valid address. | |
| 63 The only one tested here is (3). And that result may very well | |
| 64 be incorrect for (4) or (5). | |
| 65 | |
| 66 An incorrect result here does not cause incorrect results out the | |
| 67 back end, because the expander in expr.c validizes the address. However | |
| 68 it would be nice to improve the handling here in order to produce more | |
| 69 precise results. */ | |
| 70 | |
| 71 /* A "template" for memory address, used to determine whether the address is | |
| 72 valid for mode. */ | |
| 73 | |
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74 typedef struct GTY (()) mem_addr_template { |
| 0 | 75 rtx ref; /* The template. */ |
| 76 rtx * GTY ((skip)) step_p; /* The point in template where the step should be | |
| 77 filled in. */ | |
| 78 rtx * GTY ((skip)) off_p; /* The point in template where the offset should | |
| 79 be filled in. */ | |
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80 } mem_addr_template; |
| 0 | 81 |
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82 DEF_VEC_O (mem_addr_template); |
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83 DEF_VEC_ALLOC_O (mem_addr_template, gc); |
| 0 | 84 |
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85 /* The templates. Each of the low five bits of the index corresponds to one |
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86 component of TARGET_MEM_REF being present, while the high bits identify |
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87 the address space. See TEMPL_IDX. */ |
| 0 | 88 |
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89 static GTY(()) VEC (mem_addr_template, gc) *mem_addr_template_list; |
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90 |
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91 #define TEMPL_IDX(AS, SYMBOL, BASE, INDEX, STEP, OFFSET) \ |
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92 (((int) (AS) << 5) \ |
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93 | ((SYMBOL != 0) << 4) \ |
| 0 | 94 | ((BASE != 0) << 3) \ |
| 95 | ((INDEX != 0) << 2) \ | |
| 96 | ((STEP != 0) << 1) \ | |
| 97 | (OFFSET != 0)) | |
| 98 | |
| 99 /* Stores address for memory reference with parameters SYMBOL, BASE, INDEX, | |
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100 STEP and OFFSET to *ADDR using address mode ADDRESS_MODE. Stores pointers |
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101 to where step is placed to *STEP_P and offset to *OFFSET_P. */ |
| 0 | 102 |
| 103 static void | |
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104 gen_addr_rtx (enum machine_mode address_mode, |
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105 rtx symbol, rtx base, rtx index, rtx step, rtx offset, |
| 0 | 106 rtx *addr, rtx **step_p, rtx **offset_p) |
| 107 { | |
| 108 rtx act_elem; | |
| 109 | |
| 110 *addr = NULL_RTX; | |
| 111 if (step_p) | |
| 112 *step_p = NULL; | |
| 113 if (offset_p) | |
| 114 *offset_p = NULL; | |
| 115 | |
| 116 if (index) | |
| 117 { | |
| 118 act_elem = index; | |
| 119 if (step) | |
| 120 { | |
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121 act_elem = gen_rtx_MULT (address_mode, act_elem, step); |
| 0 | 122 |
| 123 if (step_p) | |
| 124 *step_p = &XEXP (act_elem, 1); | |
| 125 } | |
| 126 | |
| 127 *addr = act_elem; | |
| 128 } | |
| 129 | |
| 130 if (base) | |
| 131 { | |
| 132 if (*addr) | |
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133 *addr = simplify_gen_binary (PLUS, address_mode, base, *addr); |
| 0 | 134 else |
| 135 *addr = base; | |
| 136 } | |
| 137 | |
| 138 if (symbol) | |
| 139 { | |
| 140 act_elem = symbol; | |
| 141 if (offset) | |
| 142 { | |
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143 act_elem = gen_rtx_PLUS (address_mode, act_elem, offset); |
| 0 | 144 |
| 145 if (offset_p) | |
| 146 *offset_p = &XEXP (act_elem, 1); | |
| 147 | |
| 148 if (GET_CODE (symbol) == SYMBOL_REF | |
| 149 || GET_CODE (symbol) == LABEL_REF | |
| 150 || GET_CODE (symbol) == CONST) | |
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151 act_elem = gen_rtx_CONST (address_mode, act_elem); |
| 0 | 152 } |
| 153 | |
| 154 if (*addr) | |
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155 *addr = gen_rtx_PLUS (address_mode, *addr, act_elem); |
| 0 | 156 else |
| 157 *addr = act_elem; | |
| 158 } | |
| 159 else if (offset) | |
| 160 { | |
| 161 if (*addr) | |
| 162 { | |
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163 *addr = gen_rtx_PLUS (address_mode, *addr, offset); |
| 0 | 164 if (offset_p) |
| 165 *offset_p = &XEXP (*addr, 1); | |
| 166 } | |
| 167 else | |
| 168 { | |
| 169 *addr = offset; | |
| 170 if (offset_p) | |
| 171 *offset_p = addr; | |
| 172 } | |
| 173 } | |
| 174 | |
| 175 if (!*addr) | |
| 176 *addr = const0_rtx; | |
| 177 } | |
| 178 | |
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179 /* Returns address for TARGET_MEM_REF with parameters given by ADDR |
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180 in address space AS. |
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181 If REALLY_EXPAND is false, just make fake registers instead |
| 0 | 182 of really expanding the operands, and perform the expansion in-place |
| 183 by using one of the "templates". */ | |
| 184 | |
| 185 rtx | |
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186 addr_for_mem_ref (struct mem_address *addr, addr_space_t as, |
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187 bool really_expand) |
| 0 | 188 { |
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189 enum machine_mode address_mode = targetm.addr_space.address_mode (as); |
| 0 | 190 rtx address, sym, bse, idx, st, off; |
| 191 struct mem_addr_template *templ; | |
| 192 | |
| 193 if (addr->step && !integer_onep (addr->step)) | |
| 194 st = immed_double_const (TREE_INT_CST_LOW (addr->step), | |
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195 TREE_INT_CST_HIGH (addr->step), address_mode); |
| 0 | 196 else |
| 197 st = NULL_RTX; | |
| 198 | |
| 199 if (addr->offset && !integer_zerop (addr->offset)) | |
| 200 off = immed_double_const (TREE_INT_CST_LOW (addr->offset), | |
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201 TREE_INT_CST_HIGH (addr->offset), address_mode); |
| 0 | 202 else |
| 203 off = NULL_RTX; | |
| 204 | |
| 205 if (!really_expand) | |
| 206 { | |
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207 unsigned int templ_index |
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208 = TEMPL_IDX (as, addr->symbol, addr->base, addr->index, st, off); |
| 0 | 209 |
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210 if (templ_index |
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211 >= VEC_length (mem_addr_template, mem_addr_template_list)) |
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212 VEC_safe_grow_cleared (mem_addr_template, gc, mem_addr_template_list, |
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213 templ_index + 1); |
| 0 | 214 |
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215 /* Reuse the templates for addresses, so that we do not waste memory. */ |
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216 templ = VEC_index (mem_addr_template, mem_addr_template_list, templ_index); |
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217 if (!templ->ref) |
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218 { |
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219 sym = (addr->symbol ? |
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220 gen_rtx_SYMBOL_REF (address_mode, ggc_strdup ("test_symbol")) |
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221 : NULL_RTX); |
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222 bse = (addr->base ? |
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223 gen_raw_REG (address_mode, LAST_VIRTUAL_REGISTER + 1) |
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224 : NULL_RTX); |
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225 idx = (addr->index ? |
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226 gen_raw_REG (address_mode, LAST_VIRTUAL_REGISTER + 2) |
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227 : NULL_RTX); |
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228 |
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229 gen_addr_rtx (address_mode, sym, bse, idx, |
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230 st? const0_rtx : NULL_RTX, |
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231 off? const0_rtx : NULL_RTX, |
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232 &templ->ref, |
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233 &templ->step_p, |
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234 &templ->off_p); |
| 0 | 235 } |
| 236 | |
| 237 if (st) | |
| 238 *templ->step_p = st; | |
| 239 if (off) | |
| 240 *templ->off_p = off; | |
| 241 | |
| 242 return templ->ref; | |
| 243 } | |
| 244 | |
| 245 /* Otherwise really expand the expressions. */ | |
| 246 sym = (addr->symbol | |
| 247 ? expand_expr (build_addr (addr->symbol, current_function_decl), | |
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248 NULL_RTX, address_mode, EXPAND_NORMAL) |
| 0 | 249 : NULL_RTX); |
| 250 bse = (addr->base | |
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251 ? expand_expr (addr->base, NULL_RTX, address_mode, EXPAND_NORMAL) |
| 0 | 252 : NULL_RTX); |
| 253 idx = (addr->index | |
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254 ? expand_expr (addr->index, NULL_RTX, address_mode, EXPAND_NORMAL) |
| 0 | 255 : NULL_RTX); |
| 256 | |
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257 gen_addr_rtx (address_mode, sym, bse, idx, st, off, &address, NULL, NULL); |
| 0 | 258 return address; |
| 259 } | |
| 260 | |
| 261 /* Returns address of MEM_REF in TYPE. */ | |
| 262 | |
| 263 tree | |
| 264 tree_mem_ref_addr (tree type, tree mem_ref) | |
| 265 { | |
| 266 tree addr; | |
| 267 tree act_elem; | |
| 268 tree step = TMR_STEP (mem_ref), offset = TMR_OFFSET (mem_ref); | |
| 269 tree sym = TMR_SYMBOL (mem_ref), base = TMR_BASE (mem_ref); | |
| 270 tree addr_base = NULL_TREE, addr_off = NULL_TREE; | |
| 271 | |
| 272 if (sym) | |
| 273 addr_base = fold_convert (type, build_addr (sym, current_function_decl)); | |
| 274 else if (base && POINTER_TYPE_P (TREE_TYPE (base))) | |
| 275 { | |
| 276 addr_base = fold_convert (type, base); | |
| 277 base = NULL_TREE; | |
| 278 } | |
| 279 | |
| 280 act_elem = TMR_INDEX (mem_ref); | |
| 281 if (act_elem) | |
| 282 { | |
| 283 if (step) | |
| 284 act_elem = fold_build2 (MULT_EXPR, sizetype, act_elem, step); | |
| 285 addr_off = act_elem; | |
| 286 } | |
| 287 | |
| 288 act_elem = base; | |
| 289 if (act_elem) | |
| 290 { | |
| 291 if (addr_off) | |
| 292 addr_off = fold_build2 (PLUS_EXPR, sizetype, addr_off, act_elem); | |
| 293 else | |
| 294 addr_off = act_elem; | |
| 295 } | |
| 296 | |
| 297 if (offset && !integer_zerop (offset)) | |
| 298 { | |
| 299 if (addr_off) | |
| 300 addr_off = fold_build2 (PLUS_EXPR, sizetype, addr_off, offset); | |
| 301 else | |
| 302 addr_off = offset; | |
| 303 } | |
| 304 | |
| 305 if (addr_off) | |
| 306 { | |
| 307 if (addr_base) | |
| 308 addr = fold_build2 (POINTER_PLUS_EXPR, type, addr_base, addr_off); | |
| 309 else | |
| 310 addr = fold_convert (type, addr_off); | |
| 311 } | |
| 312 else if (addr_base) | |
| 313 addr = addr_base; | |
| 314 else | |
| 315 addr = build_int_cst (type, 0); | |
| 316 | |
| 317 return addr; | |
| 318 } | |
| 319 | |
| 320 /* Returns true if a memory reference in MODE and with parameters given by | |
| 321 ADDR is valid on the current target. */ | |
| 322 | |
| 323 static bool | |
|
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324 valid_mem_ref_p (enum machine_mode mode, addr_space_t as, |
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325 struct mem_address *addr) |
| 0 | 326 { |
| 327 rtx address; | |
| 328 | |
|
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329 address = addr_for_mem_ref (addr, as, false); |
| 0 | 330 if (!address) |
| 331 return false; | |
| 332 | |
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333 return memory_address_addr_space_p (mode, address, as); |
| 0 | 334 } |
| 335 | |
| 336 /* Checks whether a TARGET_MEM_REF with type TYPE and parameters given by ADDR | |
| 337 is valid on the current target and if so, creates and returns the | |
| 338 TARGET_MEM_REF. */ | |
| 339 | |
| 340 static tree | |
| 341 create_mem_ref_raw (tree type, struct mem_address *addr) | |
| 342 { | |
|
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343 if (!valid_mem_ref_p (TYPE_MODE (type), TYPE_ADDR_SPACE (type), addr)) |
| 0 | 344 return NULL_TREE; |
| 345 | |
| 346 if (addr->step && integer_onep (addr->step)) | |
| 347 addr->step = NULL_TREE; | |
| 348 | |
| 349 if (addr->offset && integer_zerop (addr->offset)) | |
| 350 addr->offset = NULL_TREE; | |
| 351 | |
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352 return build6 (TARGET_MEM_REF, type, |
| 0 | 353 addr->symbol, addr->base, addr->index, |
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354 addr->step, addr->offset, NULL); |
| 0 | 355 } |
| 356 | |
| 357 /* Returns true if OBJ is an object whose address is a link time constant. */ | |
| 358 | |
| 359 static bool | |
| 360 fixed_address_object_p (tree obj) | |
| 361 { | |
| 362 return (TREE_CODE (obj) == VAR_DECL | |
| 363 && (TREE_STATIC (obj) | |
| 364 || DECL_EXTERNAL (obj)) | |
| 365 && ! DECL_DLLIMPORT_P (obj)); | |
| 366 } | |
| 367 | |
| 368 /* If ADDR contains an address of object that is a link time constant, | |
| 369 move it to PARTS->symbol. */ | |
| 370 | |
| 371 static void | |
| 372 move_fixed_address_to_symbol (struct mem_address *parts, aff_tree *addr) | |
| 373 { | |
| 374 unsigned i; | |
| 375 tree val = NULL_TREE; | |
| 376 | |
| 377 for (i = 0; i < addr->n; i++) | |
| 378 { | |
| 379 if (!double_int_one_p (addr->elts[i].coef)) | |
| 380 continue; | |
| 381 | |
| 382 val = addr->elts[i].val; | |
| 383 if (TREE_CODE (val) == ADDR_EXPR | |
| 384 && fixed_address_object_p (TREE_OPERAND (val, 0))) | |
| 385 break; | |
| 386 } | |
| 387 | |
| 388 if (i == addr->n) | |
| 389 return; | |
| 390 | |
| 391 parts->symbol = TREE_OPERAND (val, 0); | |
| 392 aff_combination_remove_elt (addr, i); | |
| 393 } | |
| 394 | |
|
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395 /* If ADDR contains an instance of BASE_HINT, move it to PARTS->base. */ |
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396 |
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397 static void |
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398 move_hint_to_base (tree type, struct mem_address *parts, tree base_hint, |
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399 aff_tree *addr) |
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400 { |
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401 unsigned i; |
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402 tree val = NULL_TREE; |
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403 int qual; |
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404 |
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405 for (i = 0; i < addr->n; i++) |
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406 { |
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407 if (!double_int_one_p (addr->elts[i].coef)) |
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408 continue; |
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409 |
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410 val = addr->elts[i].val; |
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411 if (operand_equal_p (val, base_hint, 0)) |
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412 break; |
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413 } |
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414 |
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415 if (i == addr->n) |
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416 return; |
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417 |
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418 /* Cast value to appropriate pointer type. We cannot use a pointer |
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419 to TYPE directly, as the back-end will assume registers of pointer |
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420 type are aligned, and just the base itself may not actually be. |
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421 We use void pointer to the type's address space instead. */ |
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422 qual = ENCODE_QUAL_ADDR_SPACE (TYPE_ADDR_SPACE (type)); |
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423 type = build_qualified_type (void_type_node, qual); |
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424 parts->base = fold_convert (build_pointer_type (type), val); |
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425 aff_combination_remove_elt (addr, i); |
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426 } |
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427 |
| 0 | 428 /* If ADDR contains an address of a dereferenced pointer, move it to |
| 429 PARTS->base. */ | |
| 430 | |
| 431 static void | |
| 432 move_pointer_to_base (struct mem_address *parts, aff_tree *addr) | |
| 433 { | |
| 434 unsigned i; | |
| 435 tree val = NULL_TREE; | |
| 436 | |
| 437 for (i = 0; i < addr->n; i++) | |
| 438 { | |
| 439 if (!double_int_one_p (addr->elts[i].coef)) | |
| 440 continue; | |
| 441 | |
| 442 val = addr->elts[i].val; | |
| 443 if (POINTER_TYPE_P (TREE_TYPE (val))) | |
| 444 break; | |
| 445 } | |
| 446 | |
| 447 if (i == addr->n) | |
| 448 return; | |
| 449 | |
| 450 parts->base = val; | |
| 451 aff_combination_remove_elt (addr, i); | |
| 452 } | |
| 453 | |
| 454 /* Adds ELT to PARTS. */ | |
| 455 | |
| 456 static void | |
| 457 add_to_parts (struct mem_address *parts, tree elt) | |
| 458 { | |
| 459 tree type; | |
| 460 | |
| 461 if (!parts->index) | |
| 462 { | |
| 463 parts->index = fold_convert (sizetype, elt); | |
| 464 return; | |
| 465 } | |
| 466 | |
| 467 if (!parts->base) | |
| 468 { | |
| 469 parts->base = elt; | |
| 470 return; | |
| 471 } | |
| 472 | |
| 473 /* Add ELT to base. */ | |
| 474 type = TREE_TYPE (parts->base); | |
| 475 if (POINTER_TYPE_P (type)) | |
| 476 parts->base = fold_build2 (POINTER_PLUS_EXPR, type, | |
| 477 parts->base, | |
| 478 fold_convert (sizetype, elt)); | |
| 479 else | |
| 480 parts->base = fold_build2 (PLUS_EXPR, type, | |
| 481 parts->base, elt); | |
| 482 } | |
| 483 | |
| 484 /* Finds the most expensive multiplication in ADDR that can be | |
| 485 expressed in an addressing mode and move the corresponding | |
| 486 element(s) to PARTS. */ | |
| 487 | |
| 488 static void | |
|
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489 most_expensive_mult_to_index (tree type, struct mem_address *parts, |
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490 aff_tree *addr, bool speed) |
| 0 | 491 { |
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492 addr_space_t as = TYPE_ADDR_SPACE (type); |
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493 enum machine_mode address_mode = targetm.addr_space.address_mode (as); |
| 0 | 494 HOST_WIDE_INT coef; |
| 495 double_int best_mult, amult, amult_neg; | |
| 496 unsigned best_mult_cost = 0, acost; | |
| 497 tree mult_elt = NULL_TREE, elt; | |
| 498 unsigned i, j; | |
| 499 enum tree_code op_code; | |
| 500 | |
| 501 best_mult = double_int_zero; | |
| 502 for (i = 0; i < addr->n; i++) | |
| 503 { | |
| 504 if (!double_int_fits_in_shwi_p (addr->elts[i].coef)) | |
| 505 continue; | |
| 506 | |
| 507 coef = double_int_to_shwi (addr->elts[i].coef); | |
| 508 if (coef == 1 | |
|
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509 || !multiplier_allowed_in_address_p (coef, TYPE_MODE (type), as)) |
| 0 | 510 continue; |
| 511 | |
|
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512 acost = multiply_by_cost (coef, address_mode, speed); |
| 0 | 513 |
| 514 if (acost > best_mult_cost) | |
| 515 { | |
| 516 best_mult_cost = acost; | |
| 517 best_mult = addr->elts[i].coef; | |
| 518 } | |
| 519 } | |
| 520 | |
| 521 if (!best_mult_cost) | |
| 522 return; | |
| 523 | |
| 524 /* Collect elements multiplied by best_mult. */ | |
| 525 for (i = j = 0; i < addr->n; i++) | |
| 526 { | |
| 527 amult = addr->elts[i].coef; | |
| 528 amult_neg = double_int_ext_for_comb (double_int_neg (amult), addr); | |
|
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529 |
| 0 | 530 if (double_int_equal_p (amult, best_mult)) |
| 531 op_code = PLUS_EXPR; | |
| 532 else if (double_int_equal_p (amult_neg, best_mult)) | |
| 533 op_code = MINUS_EXPR; | |
| 534 else | |
| 535 { | |
| 536 addr->elts[j] = addr->elts[i]; | |
| 537 j++; | |
| 538 continue; | |
| 539 } | |
| 540 | |
| 541 elt = fold_convert (sizetype, addr->elts[i].val); | |
| 542 if (mult_elt) | |
| 543 mult_elt = fold_build2 (op_code, sizetype, mult_elt, elt); | |
| 544 else if (op_code == PLUS_EXPR) | |
| 545 mult_elt = elt; | |
| 546 else | |
| 547 mult_elt = fold_build1 (NEGATE_EXPR, sizetype, elt); | |
| 548 } | |
| 549 addr->n = j; | |
|
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550 |
| 0 | 551 parts->index = mult_elt; |
| 552 parts->step = double_int_to_tree (sizetype, best_mult); | |
| 553 } | |
| 554 | |
|
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555 /* Splits address ADDR for a memory access of type TYPE into PARTS. |
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556 If BASE_HINT is non-NULL, it specifies an SSA name to be used |
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557 preferentially as base of the reference. |
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558 |
| 0 | 559 TODO -- be more clever about the distribution of the elements of ADDR |
| 560 to PARTS. Some architectures do not support anything but single | |
| 561 register in address, possibly with a small integer offset; while | |
| 562 create_mem_ref will simplify the address to an acceptable shape | |
| 563 later, it would be more efficient to know that asking for complicated | |
| 564 addressing modes is useless. */ | |
| 565 | |
| 566 static void | |
|
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567 addr_to_parts (tree type, aff_tree *addr, tree base_hint, |
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568 struct mem_address *parts, bool speed) |
| 0 | 569 { |
| 570 tree part; | |
| 571 unsigned i; | |
| 572 | |
| 573 parts->symbol = NULL_TREE; | |
| 574 parts->base = NULL_TREE; | |
| 575 parts->index = NULL_TREE; | |
| 576 parts->step = NULL_TREE; | |
| 577 | |
| 578 if (!double_int_zero_p (addr->offset)) | |
| 579 parts->offset = double_int_to_tree (sizetype, addr->offset); | |
| 580 else | |
| 581 parts->offset = NULL_TREE; | |
| 582 | |
| 583 /* Try to find a symbol. */ | |
| 584 move_fixed_address_to_symbol (parts, addr); | |
| 585 | |
| 586 /* First move the most expensive feasible multiplication | |
| 587 to index. */ | |
|
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588 most_expensive_mult_to_index (type, parts, addr, speed); |
| 0 | 589 |
| 590 /* Try to find a base of the reference. Since at the moment | |
| 591 there is no reliable way how to distinguish between pointer and its | |
| 592 offset, this is just a guess. */ | |
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593 if (!parts->symbol && base_hint) |
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594 move_hint_to_base (type, parts, base_hint, addr); |
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595 if (!parts->symbol && !parts->base) |
| 0 | 596 move_pointer_to_base (parts, addr); |
| 597 | |
| 598 /* Then try to process the remaining elements. */ | |
| 599 for (i = 0; i < addr->n; i++) | |
| 600 { | |
| 601 part = fold_convert (sizetype, addr->elts[i].val); | |
| 602 if (!double_int_one_p (addr->elts[i].coef)) | |
| 603 part = fold_build2 (MULT_EXPR, sizetype, part, | |
| 604 double_int_to_tree (sizetype, addr->elts[i].coef)); | |
| 605 add_to_parts (parts, part); | |
| 606 } | |
| 607 if (addr->rest) | |
| 608 add_to_parts (parts, fold_convert (sizetype, addr->rest)); | |
| 609 } | |
| 610 | |
| 611 /* Force the PARTS to register. */ | |
| 612 | |
| 613 static void | |
| 614 gimplify_mem_ref_parts (gimple_stmt_iterator *gsi, struct mem_address *parts) | |
| 615 { | |
| 616 if (parts->base) | |
| 617 parts->base = force_gimple_operand_gsi (gsi, parts->base, | |
| 618 true, NULL_TREE, | |
| 619 true, GSI_SAME_STMT); | |
| 620 if (parts->index) | |
| 621 parts->index = force_gimple_operand_gsi (gsi, parts->index, | |
| 622 true, NULL_TREE, | |
| 623 true, GSI_SAME_STMT); | |
| 624 } | |
| 625 | |
| 626 /* Creates and returns a TARGET_MEM_REF for address ADDR. If necessary | |
| 627 computations are emitted in front of GSI. TYPE is the mode | |
| 628 of created memory reference. */ | |
| 629 | |
| 630 tree | |
| 631 create_mem_ref (gimple_stmt_iterator *gsi, tree type, aff_tree *addr, | |
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632 tree base_hint, bool speed) |
| 0 | 633 { |
| 634 tree mem_ref, tmp; | |
| 635 tree atype; | |
| 636 struct mem_address parts; | |
| 637 | |
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638 addr_to_parts (type, addr, base_hint, &parts, speed); |
| 0 | 639 gimplify_mem_ref_parts (gsi, &parts); |
| 640 mem_ref = create_mem_ref_raw (type, &parts); | |
| 641 if (mem_ref) | |
| 642 return mem_ref; | |
| 643 | |
| 644 /* The expression is too complicated. Try making it simpler. */ | |
| 645 | |
| 646 if (parts.step && !integer_onep (parts.step)) | |
| 647 { | |
| 648 /* Move the multiplication to index. */ | |
| 649 gcc_assert (parts.index); | |
| 650 parts.index = force_gimple_operand_gsi (gsi, | |
| 651 fold_build2 (MULT_EXPR, sizetype, | |
| 652 parts.index, parts.step), | |
| 653 true, NULL_TREE, true, GSI_SAME_STMT); | |
| 654 parts.step = NULL_TREE; | |
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655 |
| 0 | 656 mem_ref = create_mem_ref_raw (type, &parts); |
| 657 if (mem_ref) | |
| 658 return mem_ref; | |
| 659 } | |
| 660 | |
| 661 if (parts.symbol) | |
| 662 { | |
| 663 tmp = build_addr (parts.symbol, current_function_decl); | |
| 664 gcc_assert (is_gimple_val (tmp)); | |
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665 |
| 0 | 666 /* Add the symbol to base, eventually forcing it to register. */ |
| 667 if (parts.base) | |
| 668 { | |
| 669 gcc_assert (useless_type_conversion_p | |
| 670 (sizetype, TREE_TYPE (parts.base))); | |
| 671 | |
| 672 if (parts.index) | |
| 673 { | |
| 674 atype = TREE_TYPE (tmp); | |
| 675 parts.base = force_gimple_operand_gsi (gsi, | |
| 676 fold_build2 (POINTER_PLUS_EXPR, atype, | |
| 677 tmp, | |
| 678 fold_convert (sizetype, parts.base)), | |
| 679 true, NULL_TREE, true, GSI_SAME_STMT); | |
| 680 } | |
| 681 else | |
| 682 { | |
| 683 parts.index = parts.base; | |
| 684 parts.base = tmp; | |
| 685 } | |
| 686 } | |
| 687 else | |
| 688 parts.base = tmp; | |
| 689 parts.symbol = NULL_TREE; | |
| 690 | |
| 691 mem_ref = create_mem_ref_raw (type, &parts); | |
| 692 if (mem_ref) | |
| 693 return mem_ref; | |
| 694 } | |
| 695 | |
| 696 if (parts.index) | |
| 697 { | |
| 698 /* Add index to base. */ | |
| 699 if (parts.base) | |
| 700 { | |
| 701 atype = TREE_TYPE (parts.base); | |
| 702 parts.base = force_gimple_operand_gsi (gsi, | |
| 703 fold_build2 (POINTER_PLUS_EXPR, atype, | |
| 704 parts.base, | |
| 705 parts.index), | |
| 706 true, NULL_TREE, true, GSI_SAME_STMT); | |
| 707 } | |
| 708 else | |
| 709 parts.base = parts.index; | |
| 710 parts.index = NULL_TREE; | |
| 711 | |
| 712 mem_ref = create_mem_ref_raw (type, &parts); | |
| 713 if (mem_ref) | |
| 714 return mem_ref; | |
| 715 } | |
| 716 | |
| 717 if (parts.offset && !integer_zerop (parts.offset)) | |
| 718 { | |
| 719 /* Try adding offset to base. */ | |
| 720 if (parts.base) | |
| 721 { | |
| 722 atype = TREE_TYPE (parts.base); | |
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723 parts.base = force_gimple_operand_gsi (gsi, |
| 0 | 724 fold_build2 (POINTER_PLUS_EXPR, atype, |
| 725 parts.base, | |
| 726 fold_convert (sizetype, parts.offset)), | |
| 727 true, NULL_TREE, true, GSI_SAME_STMT); | |
| 728 } | |
| 729 else | |
| 730 parts.base = parts.offset; | |
| 731 | |
| 732 parts.offset = NULL_TREE; | |
| 733 | |
| 734 mem_ref = create_mem_ref_raw (type, &parts); | |
| 735 if (mem_ref) | |
| 736 return mem_ref; | |
| 737 } | |
| 738 | |
| 739 /* Verify that the address is in the simplest possible shape | |
| 740 (only a register). If we cannot create such a memory reference, | |
| 741 something is really wrong. */ | |
| 742 gcc_assert (parts.symbol == NULL_TREE); | |
| 743 gcc_assert (parts.index == NULL_TREE); | |
| 744 gcc_assert (!parts.step || integer_onep (parts.step)); | |
| 745 gcc_assert (!parts.offset || integer_zerop (parts.offset)); | |
| 746 gcc_unreachable (); | |
| 747 } | |
| 748 | |
| 749 /* Copies components of the address from OP to ADDR. */ | |
| 750 | |
| 751 void | |
| 752 get_address_description (tree op, struct mem_address *addr) | |
| 753 { | |
| 754 addr->symbol = TMR_SYMBOL (op); | |
| 755 addr->base = TMR_BASE (op); | |
| 756 addr->index = TMR_INDEX (op); | |
| 757 addr->step = TMR_STEP (op); | |
| 758 addr->offset = TMR_OFFSET (op); | |
| 759 } | |
| 760 | |
| 761 /* Copies the additional information attached to target_mem_ref FROM to TO. */ | |
| 762 | |
| 763 void | |
| 764 copy_mem_ref_info (tree to, tree from) | |
| 765 { | |
| 766 /* And the info about the original reference. */ | |
| 767 TMR_ORIGINAL (to) = TMR_ORIGINAL (from); | |
| 768 } | |
| 769 | |
| 770 /* Move constants in target_mem_ref REF to offset. Returns the new target | |
| 771 mem ref if anything changes, NULL_TREE otherwise. */ | |
| 772 | |
| 773 tree | |
| 774 maybe_fold_tmr (tree ref) | |
| 775 { | |
| 776 struct mem_address addr; | |
| 777 bool changed = false; | |
| 778 tree ret, off; | |
| 779 | |
| 780 get_address_description (ref, &addr); | |
| 781 | |
| 782 if (addr.base && TREE_CODE (addr.base) == INTEGER_CST) | |
| 783 { | |
| 784 if (addr.offset) | |
| 785 addr.offset = fold_binary_to_constant (PLUS_EXPR, sizetype, | |
| 786 addr.offset, | |
| 787 fold_convert (sizetype, addr.base)); | |
| 788 else | |
| 789 addr.offset = addr.base; | |
| 790 | |
| 791 addr.base = NULL_TREE; | |
| 792 changed = true; | |
| 793 } | |
| 794 | |
| 795 if (addr.index && TREE_CODE (addr.index) == INTEGER_CST) | |
| 796 { | |
| 797 off = addr.index; | |
| 798 if (addr.step) | |
| 799 { | |
| 800 off = fold_binary_to_constant (MULT_EXPR, sizetype, | |
| 801 off, addr.step); | |
| 802 addr.step = NULL_TREE; | |
| 803 } | |
| 804 | |
| 805 if (addr.offset) | |
| 806 { | |
| 807 addr.offset = fold_binary_to_constant (PLUS_EXPR, sizetype, | |
| 808 addr.offset, off); | |
| 809 } | |
| 810 else | |
| 811 addr.offset = off; | |
| 812 | |
| 813 addr.index = NULL_TREE; | |
| 814 changed = true; | |
| 815 } | |
| 816 | |
| 817 if (!changed) | |
| 818 return NULL_TREE; | |
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819 |
| 0 | 820 ret = create_mem_ref_raw (TREE_TYPE (ref), &addr); |
| 821 if (!ret) | |
| 822 return NULL_TREE; | |
| 823 | |
| 824 copy_mem_ref_info (ret, ref); | |
| 825 return ret; | |
| 826 } | |
| 827 | |
| 828 /* Dump PARTS to FILE. */ | |
| 829 | |
| 830 extern void dump_mem_address (FILE *, struct mem_address *); | |
| 831 void | |
| 832 dump_mem_address (FILE *file, struct mem_address *parts) | |
| 833 { | |
| 834 if (parts->symbol) | |
| 835 { | |
| 836 fprintf (file, "symbol: "); | |
| 837 print_generic_expr (file, parts->symbol, TDF_SLIM); | |
| 838 fprintf (file, "\n"); | |
| 839 } | |
| 840 if (parts->base) | |
| 841 { | |
| 842 fprintf (file, "base: "); | |
| 843 print_generic_expr (file, parts->base, TDF_SLIM); | |
| 844 fprintf (file, "\n"); | |
| 845 } | |
| 846 if (parts->index) | |
| 847 { | |
| 848 fprintf (file, "index: "); | |
| 849 print_generic_expr (file, parts->index, TDF_SLIM); | |
| 850 fprintf (file, "\n"); | |
| 851 } | |
| 852 if (parts->step) | |
| 853 { | |
| 854 fprintf (file, "step: "); | |
| 855 print_generic_expr (file, parts->step, TDF_SLIM); | |
| 856 fprintf (file, "\n"); | |
| 857 } | |
| 858 if (parts->offset) | |
| 859 { | |
| 860 fprintf (file, "offset: "); | |
| 861 print_generic_expr (file, parts->offset, TDF_SLIM); | |
| 862 fprintf (file, "\n"); | |
| 863 } | |
| 864 } | |
| 865 | |
| 866 #include "gt-tree-ssa-address.h" |