Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-address.c @ 63:b7f97abdc517 gcc-4.6-20100522
update gcc from gcc-4.5.0 to gcc-4.6
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 24 May 2010 12:47:05 +0900 |
| parents | 77e2b8dfacca |
| children | f6334be47118 |
| rev | line source |
|---|---|
| 0 | 1 /* Memory address lowering and addressing mode selection. |
|
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2 Copyright (C) 2004, 2006, 2007, 2008, 2009, 2010 |
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3 Free Software Foundation, Inc. |
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4 |
| 0 | 5 This file is part of GCC. |
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6 |
| 0 | 7 GCC is free software; you can redistribute it and/or modify it |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 3, or (at your option) any | |
| 10 later version. | |
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11 |
| 0 | 12 GCC is distributed in the hope that it will be useful, but WITHOUT |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
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16 |
| 0 | 17 You should have received a copy of the GNU General Public License |
| 18 along with GCC; see the file COPYING3. If not see | |
| 19 <http://www.gnu.org/licenses/>. */ | |
| 20 | |
| 21 /* Utility functions for manipulation with TARGET_MEM_REFs -- tree expressions | |
| 22 that directly map to addressing modes of the target. */ | |
| 23 | |
| 24 #include "config.h" | |
| 25 #include "system.h" | |
| 26 #include "coretypes.h" | |
| 27 #include "tm.h" | |
| 28 #include "tree.h" | |
| 29 #include "tm_p.h" | |
| 30 #include "basic-block.h" | |
| 31 #include "output.h" | |
| 32 #include "diagnostic.h" | |
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33 #include "tree-pretty-print.h" |
| 0 | 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" | |
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40 #include "tree-affine.h" |
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41 |
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42 /* FIXME: We compute address costs using RTL. */ |
| 0 | 43 #include "insn-config.h" |
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44 #include "rtl.h" |
| 0 | 45 #include "recog.h" |
| 46 #include "expr.h" | |
| 47 #include "ggc.h" | |
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48 #include "target.h" |
| 0 | 49 |
| 50 /* TODO -- handling of symbols (according to Richard Hendersons | |
| 51 comments, http://gcc.gnu.org/ml/gcc-patches/2005-04/msg00949.html): | |
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52 |
| 0 | 53 There are at least 5 different kinds of symbols that we can run up against: |
| 54 | |
| 55 (1) binds_local_p, small data area. | |
| 56 (2) binds_local_p, eg local statics | |
| 57 (3) !binds_local_p, eg global variables | |
| 58 (4) thread local, local_exec | |
| 59 (5) thread local, !local_exec | |
| 60 | |
| 61 Now, (1) won't appear often in an array context, but it certainly can. | |
| 62 All you have to do is set -GN high enough, or explicitly mark any | |
| 63 random object __attribute__((section (".sdata"))). | |
| 64 | |
| 65 All of these affect whether or not a symbol is in fact a valid address. | |
| 66 The only one tested here is (3). And that result may very well | |
| 67 be incorrect for (4) or (5). | |
| 68 | |
| 69 An incorrect result here does not cause incorrect results out the | |
| 70 back end, because the expander in expr.c validizes the address. However | |
| 71 it would be nice to improve the handling here in order to produce more | |
| 72 precise results. */ | |
| 73 | |
| 74 /* A "template" for memory address, used to determine whether the address is | |
| 75 valid for mode. */ | |
| 76 | |
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77 typedef struct GTY (()) mem_addr_template { |
| 0 | 78 rtx ref; /* The template. */ |
| 79 rtx * GTY ((skip)) step_p; /* The point in template where the step should be | |
| 80 filled in. */ | |
| 81 rtx * GTY ((skip)) off_p; /* The point in template where the offset should | |
| 82 be filled in. */ | |
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83 } mem_addr_template; |
| 0 | 84 |
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85 DEF_VEC_O (mem_addr_template); |
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86 DEF_VEC_ALLOC_O (mem_addr_template, gc); |
| 0 | 87 |
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88 /* The templates. Each of the low five bits of the index corresponds to one |
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89 component of TARGET_MEM_REF being present, while the high bits identify |
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90 the address space. See TEMPL_IDX. */ |
| 0 | 91 |
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92 static GTY(()) VEC (mem_addr_template, gc) *mem_addr_template_list; |
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93 |
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94 #define TEMPL_IDX(AS, SYMBOL, BASE, INDEX, STEP, OFFSET) \ |
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95 (((int) (AS) << 5) \ |
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96 | ((SYMBOL != 0) << 4) \ |
| 0 | 97 | ((BASE != 0) << 3) \ |
| 98 | ((INDEX != 0) << 2) \ | |
| 99 | ((STEP != 0) << 1) \ | |
| 100 | (OFFSET != 0)) | |
| 101 | |
| 102 /* Stores address for memory reference with parameters SYMBOL, BASE, INDEX, | |
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103 STEP and OFFSET to *ADDR using address mode ADDRESS_MODE. Stores pointers |
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104 to where step is placed to *STEP_P and offset to *OFFSET_P. */ |
| 0 | 105 |
| 106 static void | |
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107 gen_addr_rtx (enum machine_mode address_mode, |
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108 rtx symbol, rtx base, rtx index, rtx step, rtx offset, |
| 0 | 109 rtx *addr, rtx **step_p, rtx **offset_p) |
| 110 { | |
| 111 rtx act_elem; | |
| 112 | |
| 113 *addr = NULL_RTX; | |
| 114 if (step_p) | |
| 115 *step_p = NULL; | |
| 116 if (offset_p) | |
| 117 *offset_p = NULL; | |
| 118 | |
| 119 if (index) | |
| 120 { | |
| 121 act_elem = index; | |
| 122 if (step) | |
| 123 { | |
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124 act_elem = gen_rtx_MULT (address_mode, act_elem, step); |
| 0 | 125 |
| 126 if (step_p) | |
| 127 *step_p = &XEXP (act_elem, 1); | |
| 128 } | |
| 129 | |
| 130 *addr = act_elem; | |
| 131 } | |
| 132 | |
| 133 if (base) | |
| 134 { | |
| 135 if (*addr) | |
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136 *addr = simplify_gen_binary (PLUS, address_mode, base, *addr); |
| 0 | 137 else |
| 138 *addr = base; | |
| 139 } | |
| 140 | |
| 141 if (symbol) | |
| 142 { | |
| 143 act_elem = symbol; | |
| 144 if (offset) | |
| 145 { | |
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146 act_elem = gen_rtx_PLUS (address_mode, act_elem, offset); |
| 0 | 147 |
| 148 if (offset_p) | |
| 149 *offset_p = &XEXP (act_elem, 1); | |
| 150 | |
| 151 if (GET_CODE (symbol) == SYMBOL_REF | |
| 152 || GET_CODE (symbol) == LABEL_REF | |
| 153 || GET_CODE (symbol) == CONST) | |
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154 act_elem = gen_rtx_CONST (address_mode, act_elem); |
| 0 | 155 } |
| 156 | |
| 157 if (*addr) | |
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158 *addr = gen_rtx_PLUS (address_mode, *addr, act_elem); |
| 0 | 159 else |
| 160 *addr = act_elem; | |
| 161 } | |
| 162 else if (offset) | |
| 163 { | |
| 164 if (*addr) | |
| 165 { | |
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166 *addr = gen_rtx_PLUS (address_mode, *addr, offset); |
| 0 | 167 if (offset_p) |
| 168 *offset_p = &XEXP (*addr, 1); | |
| 169 } | |
| 170 else | |
| 171 { | |
| 172 *addr = offset; | |
| 173 if (offset_p) | |
| 174 *offset_p = addr; | |
| 175 } | |
| 176 } | |
| 177 | |
| 178 if (!*addr) | |
| 179 *addr = const0_rtx; | |
| 180 } | |
| 181 | |
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182 /* Returns address for TARGET_MEM_REF with parameters given by ADDR |
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183 in address space AS. |
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184 If REALLY_EXPAND is false, just make fake registers instead |
| 0 | 185 of really expanding the operands, and perform the expansion in-place |
| 186 by using one of the "templates". */ | |
| 187 | |
| 188 rtx | |
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189 addr_for_mem_ref (struct mem_address *addr, addr_space_t as, |
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190 bool really_expand) |
| 0 | 191 { |
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192 enum machine_mode address_mode = targetm.addr_space.address_mode (as); |
| 0 | 193 rtx address, sym, bse, idx, st, off; |
| 194 struct mem_addr_template *templ; | |
| 195 | |
| 196 if (addr->step && !integer_onep (addr->step)) | |
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197 st = immed_double_int_const (tree_to_double_int (addr->step), address_mode); |
| 0 | 198 else |
| 199 st = NULL_RTX; | |
| 200 | |
| 201 if (addr->offset && !integer_zerop (addr->offset)) | |
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202 off = immed_double_int_const (tree_to_double_int (addr->offset), address_mode); |
| 0 | 203 else |
| 204 off = NULL_RTX; | |
| 205 | |
| 206 if (!really_expand) | |
| 207 { | |
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208 unsigned int templ_index |
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209 = TEMPL_IDX (as, addr->symbol, addr->base, addr->index, st, off); |
| 0 | 210 |
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211 if (templ_index |
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212 >= VEC_length (mem_addr_template, mem_addr_template_list)) |
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213 VEC_safe_grow_cleared (mem_addr_template, gc, mem_addr_template_list, |
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214 templ_index + 1); |
| 0 | 215 |
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216 /* Reuse the templates for addresses, so that we do not waste memory. */ |
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217 templ = VEC_index (mem_addr_template, mem_addr_template_list, templ_index); |
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218 if (!templ->ref) |
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219 { |
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220 sym = (addr->symbol ? |
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221 gen_rtx_SYMBOL_REF (address_mode, ggc_strdup ("test_symbol")) |
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222 : NULL_RTX); |
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223 bse = (addr->base ? |
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224 gen_raw_REG (address_mode, LAST_VIRTUAL_REGISTER + 1) |
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225 : NULL_RTX); |
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226 idx = (addr->index ? |
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227 gen_raw_REG (address_mode, LAST_VIRTUAL_REGISTER + 2) |
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228 : NULL_RTX); |
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229 |
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230 gen_addr_rtx (address_mode, sym, bse, idx, |
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231 st? const0_rtx : NULL_RTX, |
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232 off? const0_rtx : NULL_RTX, |
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233 &templ->ref, |
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234 &templ->step_p, |
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235 &templ->off_p); |
| 0 | 236 } |
| 237 | |
| 238 if (st) | |
| 239 *templ->step_p = st; | |
| 240 if (off) | |
| 241 *templ->off_p = off; | |
| 242 | |
| 243 return templ->ref; | |
| 244 } | |
| 245 | |
| 246 /* Otherwise really expand the expressions. */ | |
| 247 sym = (addr->symbol | |
| 248 ? expand_expr (build_addr (addr->symbol, current_function_decl), | |
|
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249 NULL_RTX, address_mode, EXPAND_NORMAL) |
| 0 | 250 : NULL_RTX); |
| 251 bse = (addr->base | |
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252 ? expand_expr (addr->base, NULL_RTX, address_mode, EXPAND_NORMAL) |
| 0 | 253 : NULL_RTX); |
| 254 idx = (addr->index | |
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255 ? expand_expr (addr->index, NULL_RTX, address_mode, EXPAND_NORMAL) |
| 0 | 256 : NULL_RTX); |
| 257 | |
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258 gen_addr_rtx (address_mode, sym, bse, idx, st, off, &address, NULL, NULL); |
| 0 | 259 return address; |
| 260 } | |
| 261 | |
| 262 /* Returns address of MEM_REF in TYPE. */ | |
| 263 | |
| 264 tree | |
| 265 tree_mem_ref_addr (tree type, tree mem_ref) | |
| 266 { | |
| 267 tree addr; | |
| 268 tree act_elem; | |
| 269 tree step = TMR_STEP (mem_ref), offset = TMR_OFFSET (mem_ref); | |
| 270 tree sym = TMR_SYMBOL (mem_ref), base = TMR_BASE (mem_ref); | |
| 271 tree addr_base = NULL_TREE, addr_off = NULL_TREE; | |
| 272 | |
| 273 if (sym) | |
| 274 addr_base = fold_convert (type, build_addr (sym, current_function_decl)); | |
| 275 else if (base && POINTER_TYPE_P (TREE_TYPE (base))) | |
| 276 { | |
| 277 addr_base = fold_convert (type, base); | |
| 278 base = NULL_TREE; | |
| 279 } | |
| 280 | |
| 281 act_elem = TMR_INDEX (mem_ref); | |
| 282 if (act_elem) | |
| 283 { | |
| 284 if (step) | |
| 285 act_elem = fold_build2 (MULT_EXPR, sizetype, act_elem, step); | |
| 286 addr_off = act_elem; | |
| 287 } | |
| 288 | |
| 289 act_elem = base; | |
| 290 if (act_elem) | |
| 291 { | |
| 292 if (addr_off) | |
| 293 addr_off = fold_build2 (PLUS_EXPR, sizetype, addr_off, act_elem); | |
| 294 else | |
| 295 addr_off = act_elem; | |
| 296 } | |
| 297 | |
| 298 if (offset && !integer_zerop (offset)) | |
| 299 { | |
| 300 if (addr_off) | |
| 301 addr_off = fold_build2 (PLUS_EXPR, sizetype, addr_off, offset); | |
| 302 else | |
| 303 addr_off = offset; | |
| 304 } | |
| 305 | |
| 306 if (addr_off) | |
| 307 { | |
| 308 if (addr_base) | |
| 309 addr = fold_build2 (POINTER_PLUS_EXPR, type, addr_base, addr_off); | |
| 310 else | |
| 311 addr = fold_convert (type, addr_off); | |
| 312 } | |
| 313 else if (addr_base) | |
| 314 addr = addr_base; | |
| 315 else | |
| 316 addr = build_int_cst (type, 0); | |
| 317 | |
| 318 return addr; | |
| 319 } | |
| 320 | |
| 321 /* Returns true if a memory reference in MODE and with parameters given by | |
| 322 ADDR is valid on the current target. */ | |
| 323 | |
| 324 static bool | |
|
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325 valid_mem_ref_p (enum machine_mode mode, addr_space_t as, |
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326 struct mem_address *addr) |
| 0 | 327 { |
| 328 rtx address; | |
| 329 | |
|
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330 address = addr_for_mem_ref (addr, as, false); |
| 0 | 331 if (!address) |
| 332 return false; | |
| 333 | |
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334 return memory_address_addr_space_p (mode, address, as); |
| 0 | 335 } |
| 336 | |
| 337 /* Checks whether a TARGET_MEM_REF with type TYPE and parameters given by ADDR | |
| 338 is valid on the current target and if so, creates and returns the | |
| 339 TARGET_MEM_REF. */ | |
| 340 | |
| 341 static tree | |
| 342 create_mem_ref_raw (tree type, struct mem_address *addr) | |
| 343 { | |
|
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344 if (!valid_mem_ref_p (TYPE_MODE (type), TYPE_ADDR_SPACE (type), addr)) |
| 0 | 345 return NULL_TREE; |
| 346 | |
| 347 if (addr->step && integer_onep (addr->step)) | |
| 348 addr->step = NULL_TREE; | |
| 349 | |
| 350 if (addr->offset && integer_zerop (addr->offset)) | |
| 351 addr->offset = NULL_TREE; | |
| 352 | |
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353 return build6 (TARGET_MEM_REF, type, |
| 0 | 354 addr->symbol, addr->base, addr->index, |
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355 addr->step, addr->offset, NULL); |
| 0 | 356 } |
| 357 | |
| 358 /* Returns true if OBJ is an object whose address is a link time constant. */ | |
| 359 | |
| 360 static bool | |
| 361 fixed_address_object_p (tree obj) | |
| 362 { | |
| 363 return (TREE_CODE (obj) == VAR_DECL | |
| 364 && (TREE_STATIC (obj) | |
| 365 || DECL_EXTERNAL (obj)) | |
| 366 && ! DECL_DLLIMPORT_P (obj)); | |
| 367 } | |
| 368 | |
| 369 /* If ADDR contains an address of object that is a link time constant, | |
| 370 move it to PARTS->symbol. */ | |
| 371 | |
| 372 static void | |
| 373 move_fixed_address_to_symbol (struct mem_address *parts, aff_tree *addr) | |
| 374 { | |
| 375 unsigned i; | |
| 376 tree val = NULL_TREE; | |
| 377 | |
| 378 for (i = 0; i < addr->n; i++) | |
| 379 { | |
| 380 if (!double_int_one_p (addr->elts[i].coef)) | |
| 381 continue; | |
| 382 | |
| 383 val = addr->elts[i].val; | |
| 384 if (TREE_CODE (val) == ADDR_EXPR | |
| 385 && fixed_address_object_p (TREE_OPERAND (val, 0))) | |
| 386 break; | |
| 387 } | |
| 388 | |
| 389 if (i == addr->n) | |
| 390 return; | |
| 391 | |
| 392 parts->symbol = TREE_OPERAND (val, 0); | |
| 393 aff_combination_remove_elt (addr, i); | |
| 394 } | |
| 395 | |
|
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396 /* If ADDR contains an instance of BASE_HINT, move it to PARTS->base. */ |
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397 |
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398 static void |
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399 move_hint_to_base (tree type, struct mem_address *parts, tree base_hint, |
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400 aff_tree *addr) |
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401 { |
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402 unsigned i; |
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403 tree val = NULL_TREE; |
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404 int qual; |
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405 |
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406 for (i = 0; i < addr->n; i++) |
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407 { |
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408 if (!double_int_one_p (addr->elts[i].coef)) |
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409 continue; |
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410 |
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411 val = addr->elts[i].val; |
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412 if (operand_equal_p (val, base_hint, 0)) |
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413 break; |
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414 } |
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415 |
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416 if (i == addr->n) |
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417 return; |
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418 |
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419 /* Cast value to appropriate pointer type. We cannot use a pointer |
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420 to TYPE directly, as the back-end will assume registers of pointer |
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421 type are aligned, and just the base itself may not actually be. |
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422 We use void pointer to the type's address space instead. */ |
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423 qual = ENCODE_QUAL_ADDR_SPACE (TYPE_ADDR_SPACE (type)); |
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424 type = build_qualified_type (void_type_node, qual); |
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425 parts->base = fold_convert (build_pointer_type (type), val); |
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426 aff_combination_remove_elt (addr, i); |
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427 } |
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428 |
| 0 | 429 /* If ADDR contains an address of a dereferenced pointer, move it to |
| 430 PARTS->base. */ | |
| 431 | |
| 432 static void | |
| 433 move_pointer_to_base (struct mem_address *parts, aff_tree *addr) | |
| 434 { | |
| 435 unsigned i; | |
| 436 tree val = NULL_TREE; | |
| 437 | |
| 438 for (i = 0; i < addr->n; i++) | |
| 439 { | |
| 440 if (!double_int_one_p (addr->elts[i].coef)) | |
| 441 continue; | |
| 442 | |
| 443 val = addr->elts[i].val; | |
| 444 if (POINTER_TYPE_P (TREE_TYPE (val))) | |
| 445 break; | |
| 446 } | |
| 447 | |
| 448 if (i == addr->n) | |
| 449 return; | |
| 450 | |
| 451 parts->base = val; | |
| 452 aff_combination_remove_elt (addr, i); | |
| 453 } | |
| 454 | |
| 455 /* Adds ELT to PARTS. */ | |
| 456 | |
| 457 static void | |
| 458 add_to_parts (struct mem_address *parts, tree elt) | |
| 459 { | |
| 460 tree type; | |
| 461 | |
| 462 if (!parts->index) | |
| 463 { | |
| 464 parts->index = fold_convert (sizetype, elt); | |
| 465 return; | |
| 466 } | |
| 467 | |
| 468 if (!parts->base) | |
| 469 { | |
| 470 parts->base = elt; | |
| 471 return; | |
| 472 } | |
| 473 | |
| 474 /* Add ELT to base. */ | |
| 475 type = TREE_TYPE (parts->base); | |
| 476 if (POINTER_TYPE_P (type)) | |
| 477 parts->base = fold_build2 (POINTER_PLUS_EXPR, type, | |
| 478 parts->base, | |
| 479 fold_convert (sizetype, elt)); | |
| 480 else | |
| 481 parts->base = fold_build2 (PLUS_EXPR, type, | |
| 482 parts->base, elt); | |
| 483 } | |
| 484 | |
| 485 /* Finds the most expensive multiplication in ADDR that can be | |
| 486 expressed in an addressing mode and move the corresponding | |
| 487 element(s) to PARTS. */ | |
| 488 | |
| 489 static void | |
|
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490 most_expensive_mult_to_index (tree type, struct mem_address *parts, |
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491 aff_tree *addr, bool speed) |
| 0 | 492 { |
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493 addr_space_t as = TYPE_ADDR_SPACE (type); |
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494 enum machine_mode address_mode = targetm.addr_space.address_mode (as); |
| 0 | 495 HOST_WIDE_INT coef; |
| 496 double_int best_mult, amult, amult_neg; | |
| 497 unsigned best_mult_cost = 0, acost; | |
| 498 tree mult_elt = NULL_TREE, elt; | |
| 499 unsigned i, j; | |
| 500 enum tree_code op_code; | |
| 501 | |
| 502 best_mult = double_int_zero; | |
| 503 for (i = 0; i < addr->n; i++) | |
| 504 { | |
| 505 if (!double_int_fits_in_shwi_p (addr->elts[i].coef)) | |
| 506 continue; | |
| 507 | |
| 508 coef = double_int_to_shwi (addr->elts[i].coef); | |
| 509 if (coef == 1 | |
|
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510 || !multiplier_allowed_in_address_p (coef, TYPE_MODE (type), as)) |
| 0 | 511 continue; |
| 512 | |
|
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513 acost = multiply_by_cost (coef, address_mode, speed); |
| 0 | 514 |
| 515 if (acost > best_mult_cost) | |
| 516 { | |
| 517 best_mult_cost = acost; | |
| 518 best_mult = addr->elts[i].coef; | |
| 519 } | |
| 520 } | |
| 521 | |
| 522 if (!best_mult_cost) | |
| 523 return; | |
| 524 | |
| 525 /* Collect elements multiplied by best_mult. */ | |
| 526 for (i = j = 0; i < addr->n; i++) | |
| 527 { | |
| 528 amult = addr->elts[i].coef; | |
| 529 amult_neg = double_int_ext_for_comb (double_int_neg (amult), addr); | |
|
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530 |
| 0 | 531 if (double_int_equal_p (amult, best_mult)) |
| 532 op_code = PLUS_EXPR; | |
| 533 else if (double_int_equal_p (amult_neg, best_mult)) | |
| 534 op_code = MINUS_EXPR; | |
| 535 else | |
| 536 { | |
| 537 addr->elts[j] = addr->elts[i]; | |
| 538 j++; | |
| 539 continue; | |
| 540 } | |
| 541 | |
| 542 elt = fold_convert (sizetype, addr->elts[i].val); | |
| 543 if (mult_elt) | |
| 544 mult_elt = fold_build2 (op_code, sizetype, mult_elt, elt); | |
| 545 else if (op_code == PLUS_EXPR) | |
| 546 mult_elt = elt; | |
| 547 else | |
| 548 mult_elt = fold_build1 (NEGATE_EXPR, sizetype, elt); | |
| 549 } | |
| 550 addr->n = j; | |
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551 |
| 0 | 552 parts->index = mult_elt; |
| 553 parts->step = double_int_to_tree (sizetype, best_mult); | |
| 554 } | |
| 555 | |
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556 /* Splits address ADDR for a memory access of type TYPE into PARTS. |
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557 If BASE_HINT is non-NULL, it specifies an SSA name to be used |
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558 preferentially as base of the reference. |
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559 |
| 0 | 560 TODO -- be more clever about the distribution of the elements of ADDR |
| 561 to PARTS. Some architectures do not support anything but single | |
| 562 register in address, possibly with a small integer offset; while | |
| 563 create_mem_ref will simplify the address to an acceptable shape | |
| 564 later, it would be more efficient to know that asking for complicated | |
| 565 addressing modes is useless. */ | |
| 566 | |
| 567 static void | |
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568 addr_to_parts (tree type, aff_tree *addr, tree base_hint, |
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569 struct mem_address *parts, bool speed) |
| 0 | 570 { |
| 571 tree part; | |
| 572 unsigned i; | |
| 573 | |
| 574 parts->symbol = NULL_TREE; | |
| 575 parts->base = NULL_TREE; | |
| 576 parts->index = NULL_TREE; | |
| 577 parts->step = NULL_TREE; | |
| 578 | |
| 579 if (!double_int_zero_p (addr->offset)) | |
| 580 parts->offset = double_int_to_tree (sizetype, addr->offset); | |
| 581 else | |
| 582 parts->offset = NULL_TREE; | |
| 583 | |
| 584 /* Try to find a symbol. */ | |
| 585 move_fixed_address_to_symbol (parts, addr); | |
| 586 | |
| 587 /* First move the most expensive feasible multiplication | |
| 588 to index. */ | |
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589 most_expensive_mult_to_index (type, parts, addr, speed); |
| 0 | 590 |
| 591 /* Try to find a base of the reference. Since at the moment | |
| 592 there is no reliable way how to distinguish between pointer and its | |
| 593 offset, this is just a guess. */ | |
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594 if (!parts->symbol && base_hint) |
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595 move_hint_to_base (type, parts, base_hint, addr); |
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596 if (!parts->symbol && !parts->base) |
| 0 | 597 move_pointer_to_base (parts, addr); |
| 598 | |
| 599 /* Then try to process the remaining elements. */ | |
| 600 for (i = 0; i < addr->n; i++) | |
| 601 { | |
| 602 part = fold_convert (sizetype, addr->elts[i].val); | |
| 603 if (!double_int_one_p (addr->elts[i].coef)) | |
| 604 part = fold_build2 (MULT_EXPR, sizetype, part, | |
| 605 double_int_to_tree (sizetype, addr->elts[i].coef)); | |
| 606 add_to_parts (parts, part); | |
| 607 } | |
| 608 if (addr->rest) | |
| 609 add_to_parts (parts, fold_convert (sizetype, addr->rest)); | |
| 610 } | |
| 611 | |
| 612 /* Force the PARTS to register. */ | |
| 613 | |
| 614 static void | |
| 615 gimplify_mem_ref_parts (gimple_stmt_iterator *gsi, struct mem_address *parts) | |
| 616 { | |
| 617 if (parts->base) | |
| 618 parts->base = force_gimple_operand_gsi (gsi, parts->base, | |
| 619 true, NULL_TREE, | |
| 620 true, GSI_SAME_STMT); | |
| 621 if (parts->index) | |
| 622 parts->index = force_gimple_operand_gsi (gsi, parts->index, | |
| 623 true, NULL_TREE, | |
| 624 true, GSI_SAME_STMT); | |
| 625 } | |
| 626 | |
| 627 /* Creates and returns a TARGET_MEM_REF for address ADDR. If necessary | |
| 628 computations are emitted in front of GSI. TYPE is the mode | |
| 629 of created memory reference. */ | |
| 630 | |
| 631 tree | |
| 632 create_mem_ref (gimple_stmt_iterator *gsi, tree type, aff_tree *addr, | |
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633 tree base_hint, bool speed) |
| 0 | 634 { |
| 635 tree mem_ref, tmp; | |
| 636 tree atype; | |
| 637 struct mem_address parts; | |
| 638 | |
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639 addr_to_parts (type, addr, base_hint, &parts, speed); |
| 0 | 640 gimplify_mem_ref_parts (gsi, &parts); |
| 641 mem_ref = create_mem_ref_raw (type, &parts); | |
| 642 if (mem_ref) | |
| 643 return mem_ref; | |
| 644 | |
| 645 /* The expression is too complicated. Try making it simpler. */ | |
| 646 | |
| 647 if (parts.step && !integer_onep (parts.step)) | |
| 648 { | |
| 649 /* Move the multiplication to index. */ | |
| 650 gcc_assert (parts.index); | |
| 651 parts.index = force_gimple_operand_gsi (gsi, | |
| 652 fold_build2 (MULT_EXPR, sizetype, | |
| 653 parts.index, parts.step), | |
| 654 true, NULL_TREE, true, GSI_SAME_STMT); | |
| 655 parts.step = NULL_TREE; | |
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656 |
| 0 | 657 mem_ref = create_mem_ref_raw (type, &parts); |
| 658 if (mem_ref) | |
| 659 return mem_ref; | |
| 660 } | |
| 661 | |
| 662 if (parts.symbol) | |
| 663 { | |
| 664 tmp = build_addr (parts.symbol, current_function_decl); | |
| 665 gcc_assert (is_gimple_val (tmp)); | |
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666 |
| 0 | 667 /* Add the symbol to base, eventually forcing it to register. */ |
| 668 if (parts.base) | |
| 669 { | |
| 670 gcc_assert (useless_type_conversion_p | |
| 671 (sizetype, TREE_TYPE (parts.base))); | |
| 672 | |
| 673 if (parts.index) | |
| 674 { | |
| 675 atype = TREE_TYPE (tmp); | |
| 676 parts.base = force_gimple_operand_gsi (gsi, | |
| 677 fold_build2 (POINTER_PLUS_EXPR, atype, | |
| 678 tmp, | |
| 679 fold_convert (sizetype, parts.base)), | |
| 680 true, NULL_TREE, true, GSI_SAME_STMT); | |
| 681 } | |
| 682 else | |
| 683 { | |
| 684 parts.index = parts.base; | |
| 685 parts.base = tmp; | |
| 686 } | |
| 687 } | |
| 688 else | |
| 689 parts.base = tmp; | |
| 690 parts.symbol = NULL_TREE; | |
| 691 | |
| 692 mem_ref = create_mem_ref_raw (type, &parts); | |
| 693 if (mem_ref) | |
| 694 return mem_ref; | |
| 695 } | |
| 696 | |
| 697 if (parts.index) | |
| 698 { | |
| 699 /* Add index to base. */ | |
| 700 if (parts.base) | |
| 701 { | |
| 702 atype = TREE_TYPE (parts.base); | |
| 703 parts.base = force_gimple_operand_gsi (gsi, | |
| 704 fold_build2 (POINTER_PLUS_EXPR, atype, | |
| 705 parts.base, | |
| 706 parts.index), | |
| 707 true, NULL_TREE, true, GSI_SAME_STMT); | |
| 708 } | |
| 709 else | |
| 710 parts.base = parts.index; | |
| 711 parts.index = NULL_TREE; | |
| 712 | |
| 713 mem_ref = create_mem_ref_raw (type, &parts); | |
| 714 if (mem_ref) | |
| 715 return mem_ref; | |
| 716 } | |
| 717 | |
| 718 if (parts.offset && !integer_zerop (parts.offset)) | |
| 719 { | |
| 720 /* Try adding offset to base. */ | |
| 721 if (parts.base) | |
| 722 { | |
| 723 atype = TREE_TYPE (parts.base); | |
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724 parts.base = force_gimple_operand_gsi (gsi, |
| 0 | 725 fold_build2 (POINTER_PLUS_EXPR, atype, |
| 726 parts.base, | |
| 727 fold_convert (sizetype, parts.offset)), | |
| 728 true, NULL_TREE, true, GSI_SAME_STMT); | |
| 729 } | |
| 730 else | |
| 731 parts.base = parts.offset; | |
| 732 | |
| 733 parts.offset = NULL_TREE; | |
| 734 | |
| 735 mem_ref = create_mem_ref_raw (type, &parts); | |
| 736 if (mem_ref) | |
| 737 return mem_ref; | |
| 738 } | |
| 739 | |
| 740 /* Verify that the address is in the simplest possible shape | |
| 741 (only a register). If we cannot create such a memory reference, | |
| 742 something is really wrong. */ | |
| 743 gcc_assert (parts.symbol == NULL_TREE); | |
| 744 gcc_assert (parts.index == NULL_TREE); | |
| 745 gcc_assert (!parts.step || integer_onep (parts.step)); | |
| 746 gcc_assert (!parts.offset || integer_zerop (parts.offset)); | |
| 747 gcc_unreachable (); | |
| 748 } | |
| 749 | |
| 750 /* Copies components of the address from OP to ADDR. */ | |
| 751 | |
| 752 void | |
| 753 get_address_description (tree op, struct mem_address *addr) | |
| 754 { | |
| 755 addr->symbol = TMR_SYMBOL (op); | |
| 756 addr->base = TMR_BASE (op); | |
| 757 addr->index = TMR_INDEX (op); | |
| 758 addr->step = TMR_STEP (op); | |
| 759 addr->offset = TMR_OFFSET (op); | |
| 760 } | |
| 761 | |
| 762 /* Copies the additional information attached to target_mem_ref FROM to TO. */ | |
| 763 | |
| 764 void | |
| 765 copy_mem_ref_info (tree to, tree from) | |
| 766 { | |
| 767 /* And the info about the original reference. */ | |
| 768 TMR_ORIGINAL (to) = TMR_ORIGINAL (from); | |
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769 TREE_SIDE_EFFECTS (to) = TREE_SIDE_EFFECTS (from); |
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770 TREE_THIS_VOLATILE (to) = TREE_THIS_VOLATILE (from); |
| 0 | 771 } |
| 772 | |
| 773 /* Move constants in target_mem_ref REF to offset. Returns the new target | |
| 774 mem ref if anything changes, NULL_TREE otherwise. */ | |
| 775 | |
| 776 tree | |
| 777 maybe_fold_tmr (tree ref) | |
| 778 { | |
| 779 struct mem_address addr; | |
| 780 bool changed = false; | |
| 781 tree ret, off; | |
| 782 | |
| 783 get_address_description (ref, &addr); | |
| 784 | |
| 785 if (addr.base && TREE_CODE (addr.base) == INTEGER_CST) | |
| 786 { | |
| 787 if (addr.offset) | |
| 788 addr.offset = fold_binary_to_constant (PLUS_EXPR, sizetype, | |
| 789 addr.offset, | |
| 790 fold_convert (sizetype, addr.base)); | |
| 791 else | |
| 792 addr.offset = addr.base; | |
| 793 | |
| 794 addr.base = NULL_TREE; | |
| 795 changed = true; | |
| 796 } | |
| 797 | |
| 798 if (addr.index && TREE_CODE (addr.index) == INTEGER_CST) | |
| 799 { | |
| 800 off = addr.index; | |
| 801 if (addr.step) | |
| 802 { | |
| 803 off = fold_binary_to_constant (MULT_EXPR, sizetype, | |
| 804 off, addr.step); | |
| 805 addr.step = NULL_TREE; | |
| 806 } | |
| 807 | |
| 808 if (addr.offset) | |
| 809 { | |
| 810 addr.offset = fold_binary_to_constant (PLUS_EXPR, sizetype, | |
| 811 addr.offset, off); | |
| 812 } | |
| 813 else | |
| 814 addr.offset = off; | |
| 815 | |
| 816 addr.index = NULL_TREE; | |
| 817 changed = true; | |
| 818 } | |
| 819 | |
| 820 if (!changed) | |
| 821 return NULL_TREE; | |
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822 |
| 0 | 823 ret = create_mem_ref_raw (TREE_TYPE (ref), &addr); |
| 824 if (!ret) | |
| 825 return NULL_TREE; | |
| 826 | |
| 827 copy_mem_ref_info (ret, ref); | |
| 828 return ret; | |
| 829 } | |
| 830 | |
| 831 /* Dump PARTS to FILE. */ | |
| 832 | |
| 833 extern void dump_mem_address (FILE *, struct mem_address *); | |
| 834 void | |
| 835 dump_mem_address (FILE *file, struct mem_address *parts) | |
| 836 { | |
| 837 if (parts->symbol) | |
| 838 { | |
| 839 fprintf (file, "symbol: "); | |
| 840 print_generic_expr (file, parts->symbol, TDF_SLIM); | |
| 841 fprintf (file, "\n"); | |
| 842 } | |
| 843 if (parts->base) | |
| 844 { | |
| 845 fprintf (file, "base: "); | |
| 846 print_generic_expr (file, parts->base, TDF_SLIM); | |
| 847 fprintf (file, "\n"); | |
| 848 } | |
| 849 if (parts->index) | |
| 850 { | |
| 851 fprintf (file, "index: "); | |
| 852 print_generic_expr (file, parts->index, TDF_SLIM); | |
| 853 fprintf (file, "\n"); | |
| 854 } | |
| 855 if (parts->step) | |
| 856 { | |
| 857 fprintf (file, "step: "); | |
| 858 print_generic_expr (file, parts->step, TDF_SLIM); | |
| 859 fprintf (file, "\n"); | |
| 860 } | |
| 861 if (parts->offset) | |
| 862 { | |
| 863 fprintf (file, "offset: "); | |
| 864 print_generic_expr (file, parts->offset, TDF_SLIM); | |
| 865 fprintf (file, "\n"); | |
| 866 } | |
| 867 } | |
| 868 | |
| 869 #include "gt-tree-ssa-address.h" |