Mercurial > hg > CbC > CbC_gcc
annotate gcc/convert.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 /* Utility routines for data type conversion for GCC. |
| 2 Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1997, 1998, | |
|
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3 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| 0 | 4 Free Software Foundation, Inc. |
| 5 | |
| 6 This file is part of GCC. | |
| 7 | |
| 8 GCC is free software; you can redistribute it and/or modify it under | |
| 9 the terms of the GNU General Public License as published by the Free | |
| 10 Software Foundation; either version 3, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
| 22 | |
| 23 /* These routines are somewhat language-independent utility function | |
| 24 intended to be called by the language-specific convert () functions. */ | |
| 25 | |
| 26 #include "config.h" | |
| 27 #include "system.h" | |
| 28 #include "coretypes.h" | |
| 29 #include "tm.h" | |
| 30 #include "tree.h" | |
| 31 #include "flags.h" | |
| 32 #include "convert.h" | |
| 33 #include "toplev.h" | |
| 34 #include "langhooks.h" | |
| 35 | |
| 36 /* Convert EXPR to some pointer or reference type TYPE. | |
| 37 EXPR must be pointer, reference, integer, enumeral, or literal zero; | |
| 38 in other cases error is called. */ | |
| 39 | |
| 40 tree | |
| 41 convert_to_pointer (tree type, tree expr) | |
| 42 { | |
|
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43 location_t loc = EXPR_LOCATION (expr); |
| 0 | 44 if (TREE_TYPE (expr) == type) |
| 45 return expr; | |
| 46 | |
| 47 /* Propagate overflow to the NULL pointer. */ | |
| 48 if (integer_zerop (expr)) | |
| 49 return force_fit_type_double (type, 0, 0, 0, TREE_OVERFLOW (expr)); | |
| 50 | |
| 51 switch (TREE_CODE (TREE_TYPE (expr))) | |
| 52 { | |
| 53 case POINTER_TYPE: | |
| 54 case REFERENCE_TYPE: | |
|
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55 { |
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56 /* If the pointers point to different address spaces, conversion needs |
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57 to be done via a ADDR_SPACE_CONVERT_EXPR instead of a NOP_EXPR. */ |
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58 addr_space_t to_as = TYPE_ADDR_SPACE (TREE_TYPE (type)); |
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59 addr_space_t from_as = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (expr))); |
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60 |
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61 if (to_as == from_as) |
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62 return fold_build1_loc (loc, NOP_EXPR, type, expr); |
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63 else |
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64 return fold_build1_loc (loc, ADDR_SPACE_CONVERT_EXPR, type, expr); |
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65 } |
| 0 | 66 |
| 67 case INTEGER_TYPE: | |
| 68 case ENUMERAL_TYPE: | |
| 69 case BOOLEAN_TYPE: | |
|
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70 { |
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71 /* If the input precision differs from the target pointer type |
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72 precision, first convert the input expression to an integer type of |
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73 the target precision. Some targets, e.g. VMS, need several pointer |
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74 sizes to coexist so the latter isn't necessarily POINTER_SIZE. */ |
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75 unsigned int pprec = TYPE_PRECISION (type); |
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76 unsigned int eprec = TYPE_PRECISION (TREE_TYPE (expr)); |
| 0 | 77 |
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78 if (eprec != pprec) |
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79 expr = fold_build1_loc (loc, NOP_EXPR, |
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80 lang_hooks.types.type_for_size (pprec, 0), |
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81 expr); |
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82 } |
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83 |
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84 return fold_build1_loc (loc, CONVERT_EXPR, type, expr); |
| 0 | 85 |
| 86 default: | |
| 87 error ("cannot convert to a pointer type"); | |
| 88 return convert_to_pointer (type, integer_zero_node); | |
| 89 } | |
| 90 } | |
| 91 | |
| 92 /* Avoid any floating point extensions from EXP. */ | |
| 93 tree | |
| 94 strip_float_extensions (tree exp) | |
| 95 { | |
| 96 tree sub, expt, subt; | |
| 97 | |
| 98 /* For floating point constant look up the narrowest type that can hold | |
| 99 it properly and handle it like (type)(narrowest_type)constant. | |
| 100 This way we can optimize for instance a=a*2.0 where "a" is float | |
| 101 but 2.0 is double constant. */ | |
| 102 if (TREE_CODE (exp) == REAL_CST && !DECIMAL_FLOAT_TYPE_P (TREE_TYPE (exp))) | |
| 103 { | |
| 104 REAL_VALUE_TYPE orig; | |
| 105 tree type = NULL; | |
| 106 | |
| 107 orig = TREE_REAL_CST (exp); | |
| 108 if (TYPE_PRECISION (TREE_TYPE (exp)) > TYPE_PRECISION (float_type_node) | |
| 109 && exact_real_truncate (TYPE_MODE (float_type_node), &orig)) | |
| 110 type = float_type_node; | |
| 111 else if (TYPE_PRECISION (TREE_TYPE (exp)) | |
| 112 > TYPE_PRECISION (double_type_node) | |
| 113 && exact_real_truncate (TYPE_MODE (double_type_node), &orig)) | |
| 114 type = double_type_node; | |
| 115 if (type) | |
| 116 return build_real (type, real_value_truncate (TYPE_MODE (type), orig)); | |
| 117 } | |
| 118 | |
| 119 if (!CONVERT_EXPR_P (exp)) | |
| 120 return exp; | |
| 121 | |
| 122 sub = TREE_OPERAND (exp, 0); | |
| 123 subt = TREE_TYPE (sub); | |
| 124 expt = TREE_TYPE (exp); | |
| 125 | |
| 126 if (!FLOAT_TYPE_P (subt)) | |
| 127 return exp; | |
| 128 | |
| 129 if (DECIMAL_FLOAT_TYPE_P (expt) != DECIMAL_FLOAT_TYPE_P (subt)) | |
| 130 return exp; | |
| 131 | |
| 132 if (TYPE_PRECISION (subt) > TYPE_PRECISION (expt)) | |
| 133 return exp; | |
| 134 | |
| 135 return strip_float_extensions (sub); | |
| 136 } | |
| 137 | |
| 138 | |
| 139 /* Convert EXPR to some floating-point type TYPE. | |
| 140 | |
| 141 EXPR must be float, fixed-point, integer, or enumeral; | |
| 142 in other cases error is called. */ | |
| 143 | |
| 144 tree | |
| 145 convert_to_real (tree type, tree expr) | |
| 146 { | |
| 147 enum built_in_function fcode = builtin_mathfn_code (expr); | |
| 148 tree itype = TREE_TYPE (expr); | |
| 149 | |
| 150 /* Disable until we figure out how to decide whether the functions are | |
| 151 present in runtime. */ | |
| 152 /* Convert (float)sqrt((double)x) where x is float into sqrtf(x) */ | |
| 153 if (optimize | |
| 154 && (TYPE_MODE (type) == TYPE_MODE (double_type_node) | |
| 155 || TYPE_MODE (type) == TYPE_MODE (float_type_node))) | |
| 156 { | |
| 157 switch (fcode) | |
| 158 { | |
| 159 #define CASE_MATHFN(FN) case BUILT_IN_##FN: case BUILT_IN_##FN##L: | |
| 160 CASE_MATHFN (COSH) | |
| 161 CASE_MATHFN (EXP) | |
| 162 CASE_MATHFN (EXP10) | |
| 163 CASE_MATHFN (EXP2) | |
| 164 CASE_MATHFN (EXPM1) | |
| 165 CASE_MATHFN (GAMMA) | |
| 166 CASE_MATHFN (J0) | |
| 167 CASE_MATHFN (J1) | |
| 168 CASE_MATHFN (LGAMMA) | |
| 169 CASE_MATHFN (POW10) | |
| 170 CASE_MATHFN (SINH) | |
| 171 CASE_MATHFN (TGAMMA) | |
| 172 CASE_MATHFN (Y0) | |
| 173 CASE_MATHFN (Y1) | |
| 174 /* The above functions may set errno differently with float | |
| 175 input or output so this transformation is not safe with | |
| 176 -fmath-errno. */ | |
| 177 if (flag_errno_math) | |
| 178 break; | |
| 179 CASE_MATHFN (ACOS) | |
| 180 CASE_MATHFN (ACOSH) | |
| 181 CASE_MATHFN (ASIN) | |
| 182 CASE_MATHFN (ASINH) | |
| 183 CASE_MATHFN (ATAN) | |
| 184 CASE_MATHFN (ATANH) | |
| 185 CASE_MATHFN (CBRT) | |
| 186 CASE_MATHFN (COS) | |
| 187 CASE_MATHFN (ERF) | |
| 188 CASE_MATHFN (ERFC) | |
| 189 CASE_MATHFN (FABS) | |
| 190 CASE_MATHFN (LOG) | |
| 191 CASE_MATHFN (LOG10) | |
| 192 CASE_MATHFN (LOG2) | |
| 193 CASE_MATHFN (LOG1P) | |
| 194 CASE_MATHFN (LOGB) | |
| 195 CASE_MATHFN (SIN) | |
| 196 CASE_MATHFN (SQRT) | |
| 197 CASE_MATHFN (TAN) | |
| 198 CASE_MATHFN (TANH) | |
| 199 #undef CASE_MATHFN | |
| 200 { | |
| 201 tree arg0 = strip_float_extensions (CALL_EXPR_ARG (expr, 0)); | |
| 202 tree newtype = type; | |
| 203 | |
| 204 /* We have (outertype)sqrt((innertype)x). Choose the wider mode from | |
| 205 the both as the safe type for operation. */ | |
| 206 if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (type)) | |
| 207 newtype = TREE_TYPE (arg0); | |
| 208 | |
| 209 /* Be careful about integer to fp conversions. | |
| 210 These may overflow still. */ | |
| 211 if (FLOAT_TYPE_P (TREE_TYPE (arg0)) | |
| 212 && TYPE_PRECISION (newtype) < TYPE_PRECISION (itype) | |
| 213 && (TYPE_MODE (newtype) == TYPE_MODE (double_type_node) | |
| 214 || TYPE_MODE (newtype) == TYPE_MODE (float_type_node))) | |
| 215 { | |
| 216 tree fn = mathfn_built_in (newtype, fcode); | |
| 217 | |
| 218 if (fn) | |
| 219 { | |
| 220 tree arg = fold (convert_to_real (newtype, arg0)); | |
| 221 expr = build_call_expr (fn, 1, arg); | |
| 222 if (newtype == type) | |
| 223 return expr; | |
| 224 } | |
| 225 } | |
| 226 } | |
| 227 default: | |
| 228 break; | |
| 229 } | |
| 230 } | |
| 231 if (optimize | |
| 232 && (((fcode == BUILT_IN_FLOORL | |
| 233 || fcode == BUILT_IN_CEILL | |
| 234 || fcode == BUILT_IN_ROUNDL | |
| 235 || fcode == BUILT_IN_RINTL | |
| 236 || fcode == BUILT_IN_TRUNCL | |
| 237 || fcode == BUILT_IN_NEARBYINTL) | |
| 238 && (TYPE_MODE (type) == TYPE_MODE (double_type_node) | |
| 239 || TYPE_MODE (type) == TYPE_MODE (float_type_node))) | |
| 240 || ((fcode == BUILT_IN_FLOOR | |
| 241 || fcode == BUILT_IN_CEIL | |
| 242 || fcode == BUILT_IN_ROUND | |
| 243 || fcode == BUILT_IN_RINT | |
| 244 || fcode == BUILT_IN_TRUNC | |
| 245 || fcode == BUILT_IN_NEARBYINT) | |
| 246 && (TYPE_MODE (type) == TYPE_MODE (float_type_node))))) | |
| 247 { | |
| 248 tree fn = mathfn_built_in (type, fcode); | |
| 249 | |
| 250 if (fn) | |
| 251 { | |
| 252 tree arg = strip_float_extensions (CALL_EXPR_ARG (expr, 0)); | |
| 253 | |
| 254 /* Make sure (type)arg0 is an extension, otherwise we could end up | |
| 255 changing (float)floor(double d) into floorf((float)d), which is | |
| 256 incorrect because (float)d uses round-to-nearest and can round | |
| 257 up to the next integer. */ | |
| 258 if (TYPE_PRECISION (type) >= TYPE_PRECISION (TREE_TYPE (arg))) | |
| 259 return build_call_expr (fn, 1, fold (convert_to_real (type, arg))); | |
| 260 } | |
| 261 } | |
| 262 | |
| 263 /* Propagate the cast into the operation. */ | |
| 264 if (itype != type && FLOAT_TYPE_P (type)) | |
| 265 switch (TREE_CODE (expr)) | |
| 266 { | |
| 267 /* Convert (float)-x into -(float)x. This is safe for | |
| 268 round-to-nearest rounding mode. */ | |
| 269 case ABS_EXPR: | |
| 270 case NEGATE_EXPR: | |
| 271 if (!flag_rounding_math | |
| 272 && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr))) | |
| 273 return build1 (TREE_CODE (expr), type, | |
| 274 fold (convert_to_real (type, | |
| 275 TREE_OPERAND (expr, 0)))); | |
| 276 break; | |
| 277 /* Convert (outertype)((innertype0)a+(innertype1)b) | |
| 278 into ((newtype)a+(newtype)b) where newtype | |
| 279 is the widest mode from all of these. */ | |
| 280 case PLUS_EXPR: | |
| 281 case MINUS_EXPR: | |
| 282 case MULT_EXPR: | |
| 283 case RDIV_EXPR: | |
| 284 { | |
| 285 tree arg0 = strip_float_extensions (TREE_OPERAND (expr, 0)); | |
| 286 tree arg1 = strip_float_extensions (TREE_OPERAND (expr, 1)); | |
| 287 | |
| 288 if (FLOAT_TYPE_P (TREE_TYPE (arg0)) | |
| 289 && FLOAT_TYPE_P (TREE_TYPE (arg1)) | |
| 290 && DECIMAL_FLOAT_TYPE_P (itype) == DECIMAL_FLOAT_TYPE_P (type)) | |
| 291 { | |
| 292 tree newtype = type; | |
| 293 | |
| 294 if (TYPE_MODE (TREE_TYPE (arg0)) == SDmode | |
| 295 || TYPE_MODE (TREE_TYPE (arg1)) == SDmode | |
| 296 || TYPE_MODE (type) == SDmode) | |
| 297 newtype = dfloat32_type_node; | |
| 298 if (TYPE_MODE (TREE_TYPE (arg0)) == DDmode | |
| 299 || TYPE_MODE (TREE_TYPE (arg1)) == DDmode | |
| 300 || TYPE_MODE (type) == DDmode) | |
| 301 newtype = dfloat64_type_node; | |
| 302 if (TYPE_MODE (TREE_TYPE (arg0)) == TDmode | |
| 303 || TYPE_MODE (TREE_TYPE (arg1)) == TDmode | |
| 304 || TYPE_MODE (type) == TDmode) | |
| 305 newtype = dfloat128_type_node; | |
| 306 if (newtype == dfloat32_type_node | |
| 307 || newtype == dfloat64_type_node | |
| 308 || newtype == dfloat128_type_node) | |
| 309 { | |
| 310 expr = build2 (TREE_CODE (expr), newtype, | |
| 311 fold (convert_to_real (newtype, arg0)), | |
| 312 fold (convert_to_real (newtype, arg1))); | |
| 313 if (newtype == type) | |
| 314 return expr; | |
| 315 break; | |
| 316 } | |
| 317 | |
| 318 if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (newtype)) | |
| 319 newtype = TREE_TYPE (arg0); | |
| 320 if (TYPE_PRECISION (TREE_TYPE (arg1)) > TYPE_PRECISION (newtype)) | |
| 321 newtype = TREE_TYPE (arg1); | |
| 322 /* Sometimes this transformation is safe (cannot | |
| 323 change results through affecting double rounding | |
| 324 cases) and sometimes it is not. If NEWTYPE is | |
| 325 wider than TYPE, e.g. (float)((long double)double | |
| 326 + (long double)double) converted to | |
| 327 (float)(double + double), the transformation is | |
| 328 unsafe regardless of the details of the types | |
| 329 involved; double rounding can arise if the result | |
| 330 of NEWTYPE arithmetic is a NEWTYPE value half way | |
| 331 between two representable TYPE values but the | |
| 332 exact value is sufficiently different (in the | |
| 333 right direction) for this difference to be | |
| 334 visible in ITYPE arithmetic. If NEWTYPE is the | |
| 335 same as TYPE, however, the transformation may be | |
| 336 safe depending on the types involved: it is safe | |
| 337 if the ITYPE has strictly more than twice as many | |
| 338 mantissa bits as TYPE, can represent infinities | |
| 339 and NaNs if the TYPE can, and has sufficient | |
| 340 exponent range for the product or ratio of two | |
| 341 values representable in the TYPE to be within the | |
| 342 range of normal values of ITYPE. */ | |
| 343 if (TYPE_PRECISION (newtype) < TYPE_PRECISION (itype) | |
| 344 && (flag_unsafe_math_optimizations | |
| 345 || (TYPE_PRECISION (newtype) == TYPE_PRECISION (type) | |
| 346 && real_can_shorten_arithmetic (TYPE_MODE (itype), | |
|
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347 TYPE_MODE (type)) |
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348 && !excess_precision_type (newtype)))) |
| 0 | 349 { |
| 350 expr = build2 (TREE_CODE (expr), newtype, | |
| 351 fold (convert_to_real (newtype, arg0)), | |
| 352 fold (convert_to_real (newtype, arg1))); | |
| 353 if (newtype == type) | |
| 354 return expr; | |
| 355 } | |
| 356 } | |
| 357 } | |
| 358 break; | |
| 359 default: | |
| 360 break; | |
| 361 } | |
| 362 | |
| 363 switch (TREE_CODE (TREE_TYPE (expr))) | |
| 364 { | |
| 365 case REAL_TYPE: | |
| 366 /* Ignore the conversion if we don't need to store intermediate | |
| 367 results and neither type is a decimal float. */ | |
| 368 return build1 ((flag_float_store | |
| 369 || DECIMAL_FLOAT_TYPE_P (type) | |
| 370 || DECIMAL_FLOAT_TYPE_P (itype)) | |
| 371 ? CONVERT_EXPR : NOP_EXPR, type, expr); | |
| 372 | |
| 373 case INTEGER_TYPE: | |
| 374 case ENUMERAL_TYPE: | |
| 375 case BOOLEAN_TYPE: | |
| 376 return build1 (FLOAT_EXPR, type, expr); | |
| 377 | |
| 378 case FIXED_POINT_TYPE: | |
| 379 return build1 (FIXED_CONVERT_EXPR, type, expr); | |
| 380 | |
| 381 case COMPLEX_TYPE: | |
| 382 return convert (type, | |
| 383 fold_build1 (REALPART_EXPR, | |
| 384 TREE_TYPE (TREE_TYPE (expr)), expr)); | |
| 385 | |
| 386 case POINTER_TYPE: | |
| 387 case REFERENCE_TYPE: | |
| 388 error ("pointer value used where a floating point value was expected"); | |
| 389 return convert_to_real (type, integer_zero_node); | |
| 390 | |
| 391 default: | |
| 392 error ("aggregate value used where a float was expected"); | |
| 393 return convert_to_real (type, integer_zero_node); | |
| 394 } | |
| 395 } | |
| 396 | |
| 397 /* Convert EXPR to some integer (or enum) type TYPE. | |
| 398 | |
| 399 EXPR must be pointer, integer, discrete (enum, char, or bool), float, | |
| 400 fixed-point or vector; in other cases error is called. | |
| 401 | |
| 402 The result of this is always supposed to be a newly created tree node | |
| 403 not in use in any existing structure. */ | |
| 404 | |
| 405 tree | |
| 406 convert_to_integer (tree type, tree expr) | |
| 407 { | |
| 408 enum tree_code ex_form = TREE_CODE (expr); | |
| 409 tree intype = TREE_TYPE (expr); | |
| 410 unsigned int inprec = TYPE_PRECISION (intype); | |
| 411 unsigned int outprec = TYPE_PRECISION (type); | |
| 412 | |
| 413 /* An INTEGER_TYPE cannot be incomplete, but an ENUMERAL_TYPE can | |
| 414 be. Consider `enum E = { a, b = (enum E) 3 };'. */ | |
| 415 if (!COMPLETE_TYPE_P (type)) | |
| 416 { | |
| 417 error ("conversion to incomplete type"); | |
| 418 return error_mark_node; | |
| 419 } | |
| 420 | |
| 421 /* Convert e.g. (long)round(d) -> lround(d). */ | |
| 422 /* If we're converting to char, we may encounter differing behavior | |
| 423 between converting from double->char vs double->long->char. | |
| 424 We're in "undefined" territory but we prefer to be conservative, | |
| 425 so only proceed in "unsafe" math mode. */ | |
| 426 if (optimize | |
| 427 && (flag_unsafe_math_optimizations | |
| 428 || (long_integer_type_node | |
| 429 && outprec >= TYPE_PRECISION (long_integer_type_node)))) | |
| 430 { | |
| 431 tree s_expr = strip_float_extensions (expr); | |
| 432 tree s_intype = TREE_TYPE (s_expr); | |
| 433 const enum built_in_function fcode = builtin_mathfn_code (s_expr); | |
| 434 tree fn = 0; | |
|
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435 |
| 0 | 436 switch (fcode) |
| 437 { | |
| 438 CASE_FLT_FN (BUILT_IN_CEIL): | |
| 439 /* Only convert in ISO C99 mode. */ | |
| 440 if (!TARGET_C99_FUNCTIONS) | |
| 441 break; | |
| 442 if (outprec < TYPE_PRECISION (long_integer_type_node) | |
| 443 || (outprec == TYPE_PRECISION (long_integer_type_node) | |
| 444 && !TYPE_UNSIGNED (type))) | |
| 445 fn = mathfn_built_in (s_intype, BUILT_IN_LCEIL); | |
| 446 else if (outprec == TYPE_PRECISION (long_long_integer_type_node) | |
| 447 && !TYPE_UNSIGNED (type)) | |
| 448 fn = mathfn_built_in (s_intype, BUILT_IN_LLCEIL); | |
| 449 break; | |
| 450 | |
| 451 CASE_FLT_FN (BUILT_IN_FLOOR): | |
| 452 /* Only convert in ISO C99 mode. */ | |
| 453 if (!TARGET_C99_FUNCTIONS) | |
| 454 break; | |
| 455 if (outprec < TYPE_PRECISION (long_integer_type_node) | |
| 456 || (outprec == TYPE_PRECISION (long_integer_type_node) | |
| 457 && !TYPE_UNSIGNED (type))) | |
| 458 fn = mathfn_built_in (s_intype, BUILT_IN_LFLOOR); | |
| 459 else if (outprec == TYPE_PRECISION (long_long_integer_type_node) | |
| 460 && !TYPE_UNSIGNED (type)) | |
| 461 fn = mathfn_built_in (s_intype, BUILT_IN_LLFLOOR); | |
| 462 break; | |
| 463 | |
| 464 CASE_FLT_FN (BUILT_IN_ROUND): | |
| 465 if (outprec < TYPE_PRECISION (long_integer_type_node) | |
| 466 || (outprec == TYPE_PRECISION (long_integer_type_node) | |
| 467 && !TYPE_UNSIGNED (type))) | |
| 468 fn = mathfn_built_in (s_intype, BUILT_IN_LROUND); | |
| 469 else if (outprec == TYPE_PRECISION (long_long_integer_type_node) | |
| 470 && !TYPE_UNSIGNED (type)) | |
| 471 fn = mathfn_built_in (s_intype, BUILT_IN_LLROUND); | |
| 472 break; | |
| 473 | |
| 474 CASE_FLT_FN (BUILT_IN_NEARBYINT): | |
| 475 /* Only convert nearbyint* if we can ignore math exceptions. */ | |
| 476 if (flag_trapping_math) | |
| 477 break; | |
| 478 /* ... Fall through ... */ | |
| 479 CASE_FLT_FN (BUILT_IN_RINT): | |
| 480 if (outprec < TYPE_PRECISION (long_integer_type_node) | |
| 481 || (outprec == TYPE_PRECISION (long_integer_type_node) | |
| 482 && !TYPE_UNSIGNED (type))) | |
| 483 fn = mathfn_built_in (s_intype, BUILT_IN_LRINT); | |
| 484 else if (outprec == TYPE_PRECISION (long_long_integer_type_node) | |
| 485 && !TYPE_UNSIGNED (type)) | |
| 486 fn = mathfn_built_in (s_intype, BUILT_IN_LLRINT); | |
| 487 break; | |
| 488 | |
| 489 CASE_FLT_FN (BUILT_IN_TRUNC): | |
| 490 return convert_to_integer (type, CALL_EXPR_ARG (s_expr, 0)); | |
| 491 | |
| 492 default: | |
| 493 break; | |
| 494 } | |
|
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495 |
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496 if (fn) |
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497 { |
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498 tree newexpr = build_call_expr (fn, 1, CALL_EXPR_ARG (s_expr, 0)); |
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499 return convert_to_integer (type, newexpr); |
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500 } |
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501 } |
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502 |
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503 /* Convert (int)logb(d) -> ilogb(d). */ |
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504 if (optimize |
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505 && flag_unsafe_math_optimizations |
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506 && !flag_trapping_math && !flag_errno_math && flag_finite_math_only |
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507 && integer_type_node |
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508 && (outprec > TYPE_PRECISION (integer_type_node) |
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509 || (outprec == TYPE_PRECISION (integer_type_node) |
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510 && !TYPE_UNSIGNED (type)))) |
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511 { |
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512 tree s_expr = strip_float_extensions (expr); |
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513 tree s_intype = TREE_TYPE (s_expr); |
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514 const enum built_in_function fcode = builtin_mathfn_code (s_expr); |
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515 tree fn = 0; |
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516 |
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517 switch (fcode) |
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518 { |
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519 CASE_FLT_FN (BUILT_IN_LOGB): |
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520 fn = mathfn_built_in (s_intype, BUILT_IN_ILOGB); |
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521 break; |
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522 |
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523 default: |
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524 break; |
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525 } |
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526 |
| 0 | 527 if (fn) |
| 528 { | |
| 529 tree newexpr = build_call_expr (fn, 1, CALL_EXPR_ARG (s_expr, 0)); | |
| 530 return convert_to_integer (type, newexpr); | |
| 531 } | |
| 532 } | |
| 533 | |
| 534 switch (TREE_CODE (intype)) | |
| 535 { | |
| 536 case POINTER_TYPE: | |
| 537 case REFERENCE_TYPE: | |
| 538 if (integer_zerop (expr)) | |
| 539 return build_int_cst (type, 0); | |
| 540 | |
|
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541 /* Convert to an unsigned integer of the correct width first, and from |
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542 there widen/truncate to the required type. Some targets support the |
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543 coexistence of multiple valid pointer sizes, so fetch the one we need |
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544 from the type. */ |
| 0 | 545 expr = fold_build1 (CONVERT_EXPR, |
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546 lang_hooks.types.type_for_size |
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547 (TYPE_PRECISION (intype), 0), |
| 0 | 548 expr); |
| 549 return fold_convert (type, expr); | |
| 550 | |
| 551 case INTEGER_TYPE: | |
| 552 case ENUMERAL_TYPE: | |
| 553 case BOOLEAN_TYPE: | |
| 554 case OFFSET_TYPE: | |
| 555 /* If this is a logical operation, which just returns 0 or 1, we can | |
| 556 change the type of the expression. */ | |
| 557 | |
| 558 if (TREE_CODE_CLASS (ex_form) == tcc_comparison) | |
| 559 { | |
| 560 expr = copy_node (expr); | |
| 561 TREE_TYPE (expr) = type; | |
| 562 return expr; | |
| 563 } | |
| 564 | |
| 565 /* If we are widening the type, put in an explicit conversion. | |
| 566 Similarly if we are not changing the width. After this, we know | |
| 567 we are truncating EXPR. */ | |
| 568 | |
| 569 else if (outprec >= inprec) | |
| 570 { | |
| 571 enum tree_code code; | |
| 572 tree tem; | |
| 573 | |
| 574 /* If the precision of the EXPR's type is K bits and the | |
| 575 destination mode has more bits, and the sign is changing, | |
| 576 it is not safe to use a NOP_EXPR. For example, suppose | |
| 577 that EXPR's type is a 3-bit unsigned integer type, the | |
| 578 TYPE is a 3-bit signed integer type, and the machine mode | |
| 579 for the types is 8-bit QImode. In that case, the | |
| 580 conversion necessitates an explicit sign-extension. In | |
| 581 the signed-to-unsigned case the high-order bits have to | |
| 582 be cleared. */ | |
| 583 if (TYPE_UNSIGNED (type) != TYPE_UNSIGNED (TREE_TYPE (expr)) | |
| 584 && (TYPE_PRECISION (TREE_TYPE (expr)) | |
| 585 != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr))))) | |
| 586 code = CONVERT_EXPR; | |
| 587 else | |
| 588 code = NOP_EXPR; | |
| 589 | |
| 590 tem = fold_unary (code, type, expr); | |
| 591 if (tem) | |
| 592 return tem; | |
| 593 | |
| 594 tem = build1 (code, type, expr); | |
| 595 TREE_NO_WARNING (tem) = 1; | |
| 596 return tem; | |
| 597 } | |
| 598 | |
| 599 /* If TYPE is an enumeral type or a type with a precision less | |
| 600 than the number of bits in its mode, do the conversion to the | |
| 601 type corresponding to its mode, then do a nop conversion | |
| 602 to TYPE. */ | |
| 603 else if (TREE_CODE (type) == ENUMERAL_TYPE | |
| 604 || outprec != GET_MODE_BITSIZE (TYPE_MODE (type))) | |
| 605 return build1 (NOP_EXPR, type, | |
| 606 convert (lang_hooks.types.type_for_mode | |
| 607 (TYPE_MODE (type), TYPE_UNSIGNED (type)), | |
| 608 expr)); | |
| 609 | |
| 610 /* Here detect when we can distribute the truncation down past some | |
| 611 arithmetic. For example, if adding two longs and converting to an | |
| 612 int, we can equally well convert both to ints and then add. | |
| 613 For the operations handled here, such truncation distribution | |
| 614 is always safe. | |
| 615 It is desirable in these cases: | |
| 616 1) when truncating down to full-word from a larger size | |
| 617 2) when truncating takes no work. | |
| 618 3) when at least one operand of the arithmetic has been extended | |
| 619 (as by C's default conversions). In this case we need two conversions | |
| 620 if we do the arithmetic as already requested, so we might as well | |
| 621 truncate both and then combine. Perhaps that way we need only one. | |
| 622 | |
| 623 Note that in general we cannot do the arithmetic in a type | |
| 624 shorter than the desired result of conversion, even if the operands | |
| 625 are both extended from a shorter type, because they might overflow | |
| 626 if combined in that type. The exceptions to this--the times when | |
| 627 two narrow values can be combined in their narrow type even to | |
| 628 make a wider result--are handled by "shorten" in build_binary_op. */ | |
| 629 | |
| 630 switch (ex_form) | |
| 631 { | |
| 632 case RSHIFT_EXPR: | |
| 633 /* We can pass truncation down through right shifting | |
| 634 when the shift count is a nonpositive constant. */ | |
| 635 if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST | |
| 636 && tree_int_cst_sgn (TREE_OPERAND (expr, 1)) <= 0) | |
| 637 goto trunc1; | |
| 638 break; | |
| 639 | |
| 640 case LSHIFT_EXPR: | |
| 641 /* We can pass truncation down through left shifting | |
| 642 when the shift count is a nonnegative constant and | |
| 643 the target type is unsigned. */ | |
| 644 if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST | |
| 645 && tree_int_cst_sgn (TREE_OPERAND (expr, 1)) >= 0 | |
| 646 && TYPE_UNSIGNED (type) | |
| 647 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST) | |
| 648 { | |
| 649 /* If shift count is less than the width of the truncated type, | |
| 650 really shift. */ | |
| 651 if (tree_int_cst_lt (TREE_OPERAND (expr, 1), TYPE_SIZE (type))) | |
| 652 /* In this case, shifting is like multiplication. */ | |
| 653 goto trunc1; | |
| 654 else | |
| 655 { | |
| 656 /* If it is >= that width, result is zero. | |
| 657 Handling this with trunc1 would give the wrong result: | |
| 658 (int) ((long long) a << 32) is well defined (as 0) | |
| 659 but (int) a << 32 is undefined and would get a | |
| 660 warning. */ | |
| 661 | |
| 662 tree t = build_int_cst (type, 0); | |
| 663 | |
| 664 /* If the original expression had side-effects, we must | |
| 665 preserve it. */ | |
| 666 if (TREE_SIDE_EFFECTS (expr)) | |
| 667 return build2 (COMPOUND_EXPR, type, expr, t); | |
| 668 else | |
| 669 return t; | |
| 670 } | |
| 671 } | |
| 672 break; | |
| 673 | |
|
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674 case TRUNC_DIV_EXPR: |
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675 { |
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676 tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type); |
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677 tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type); |
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678 |
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679 /* Don't distribute unless the output precision is at least as big |
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680 as the actual inputs and it has the same signedness. */ |
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681 if (outprec >= TYPE_PRECISION (TREE_TYPE (arg0)) |
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682 && outprec >= TYPE_PRECISION (TREE_TYPE (arg1)) |
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683 /* If signedness of arg0 and arg1 don't match, |
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684 we can't necessarily find a type to compare them in. */ |
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685 && (TYPE_UNSIGNED (TREE_TYPE (arg0)) |
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686 == TYPE_UNSIGNED (TREE_TYPE (arg1))) |
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687 /* Do not change the sign of the division. */ |
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688 && (TYPE_UNSIGNED (TREE_TYPE (expr)) |
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689 == TYPE_UNSIGNED (TREE_TYPE (arg0))) |
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690 /* Either require unsigned division or a division by |
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691 a constant that is not -1. */ |
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692 && (TYPE_UNSIGNED (TREE_TYPE (arg0)) |
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693 || (TREE_CODE (arg1) == INTEGER_CST |
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694 && !integer_all_onesp (arg1)))) |
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695 goto trunc1; |
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696 break; |
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697 } |
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698 |
| 0 | 699 case MAX_EXPR: |
| 700 case MIN_EXPR: | |
| 701 case MULT_EXPR: | |
| 702 { | |
| 703 tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type); | |
| 704 tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type); | |
| 705 | |
| 706 /* Don't distribute unless the output precision is at least as big | |
| 707 as the actual inputs. Otherwise, the comparison of the | |
| 708 truncated values will be wrong. */ | |
| 709 if (outprec >= TYPE_PRECISION (TREE_TYPE (arg0)) | |
| 710 && outprec >= TYPE_PRECISION (TREE_TYPE (arg1)) | |
| 711 /* If signedness of arg0 and arg1 don't match, | |
| 712 we can't necessarily find a type to compare them in. */ | |
| 713 && (TYPE_UNSIGNED (TREE_TYPE (arg0)) | |
| 714 == TYPE_UNSIGNED (TREE_TYPE (arg1)))) | |
| 715 goto trunc1; | |
| 716 break; | |
| 717 } | |
| 718 | |
| 719 case PLUS_EXPR: | |
| 720 case MINUS_EXPR: | |
| 721 case BIT_AND_EXPR: | |
| 722 case BIT_IOR_EXPR: | |
| 723 case BIT_XOR_EXPR: | |
| 724 trunc1: | |
| 725 { | |
| 726 tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type); | |
| 727 tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type); | |
| 728 | |
| 729 if (outprec >= BITS_PER_WORD | |
| 730 || TRULY_NOOP_TRUNCATION (outprec, inprec) | |
| 731 || inprec > TYPE_PRECISION (TREE_TYPE (arg0)) | |
| 732 || inprec > TYPE_PRECISION (TREE_TYPE (arg1))) | |
| 733 { | |
| 734 /* Do the arithmetic in type TYPEX, | |
| 735 then convert result to TYPE. */ | |
| 736 tree typex = type; | |
| 737 | |
| 738 /* Can't do arithmetic in enumeral types | |
| 739 so use an integer type that will hold the values. */ | |
| 740 if (TREE_CODE (typex) == ENUMERAL_TYPE) | |
| 741 typex = lang_hooks.types.type_for_size | |
| 742 (TYPE_PRECISION (typex), TYPE_UNSIGNED (typex)); | |
| 743 | |
| 744 /* But now perhaps TYPEX is as wide as INPREC. | |
| 745 In that case, do nothing special here. | |
| 746 (Otherwise would recurse infinitely in convert. */ | |
| 747 if (TYPE_PRECISION (typex) != inprec) | |
| 748 { | |
| 749 /* Don't do unsigned arithmetic where signed was wanted, | |
| 750 or vice versa. | |
| 751 Exception: if both of the original operands were | |
| 752 unsigned then we can safely do the work as unsigned. | |
| 753 Exception: shift operations take their type solely | |
| 754 from the first argument. | |
| 755 Exception: the LSHIFT_EXPR case above requires that | |
| 756 we perform this operation unsigned lest we produce | |
| 757 signed-overflow undefinedness. | |
| 758 And we may need to do it as unsigned | |
| 759 if we truncate to the original size. */ | |
| 760 if (TYPE_UNSIGNED (TREE_TYPE (expr)) | |
| 761 || (TYPE_UNSIGNED (TREE_TYPE (arg0)) | |
| 762 && (TYPE_UNSIGNED (TREE_TYPE (arg1)) | |
| 763 || ex_form == LSHIFT_EXPR | |
| 764 || ex_form == RSHIFT_EXPR | |
| 765 || ex_form == LROTATE_EXPR | |
| 766 || ex_form == RROTATE_EXPR)) | |
| 767 || ex_form == LSHIFT_EXPR | |
| 768 /* If we have !flag_wrapv, and either ARG0 or | |
| 769 ARG1 is of a signed type, we have to do | |
| 770 PLUS_EXPR or MINUS_EXPR in an unsigned | |
| 771 type. Otherwise, we would introduce | |
| 772 signed-overflow undefinedness. */ | |
| 773 || ((!TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0)) | |
| 774 || !TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg1))) | |
| 775 && (ex_form == PLUS_EXPR | |
| 776 || ex_form == MINUS_EXPR))) | |
| 777 typex = unsigned_type_for (typex); | |
| 778 else | |
| 779 typex = signed_type_for (typex); | |
| 780 return convert (type, | |
| 781 fold_build2 (ex_form, typex, | |
| 782 convert (typex, arg0), | |
| 783 convert (typex, arg1))); | |
| 784 } | |
| 785 } | |
| 786 } | |
| 787 break; | |
| 788 | |
| 789 case NEGATE_EXPR: | |
| 790 case BIT_NOT_EXPR: | |
| 791 /* This is not correct for ABS_EXPR, | |
| 792 since we must test the sign before truncation. */ | |
| 793 { | |
| 794 tree typex; | |
| 795 | |
| 796 /* Don't do unsigned arithmetic where signed was wanted, | |
| 797 or vice versa. */ | |
| 798 if (TYPE_UNSIGNED (TREE_TYPE (expr))) | |
| 799 typex = unsigned_type_for (type); | |
| 800 else | |
| 801 typex = signed_type_for (type); | |
| 802 return convert (type, | |
| 803 fold_build1 (ex_form, typex, | |
| 804 convert (typex, | |
| 805 TREE_OPERAND (expr, 0)))); | |
| 806 } | |
| 807 | |
| 808 case NOP_EXPR: | |
| 809 /* Don't introduce a | |
| 810 "can't convert between vector values of different size" error. */ | |
| 811 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == VECTOR_TYPE | |
| 812 && (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (TREE_OPERAND (expr, 0)))) | |
| 813 != GET_MODE_SIZE (TYPE_MODE (type)))) | |
| 814 break; | |
| 815 /* If truncating after truncating, might as well do all at once. | |
| 816 If truncating after extending, we may get rid of wasted work. */ | |
| 817 return convert (type, get_unwidened (TREE_OPERAND (expr, 0), type)); | |
| 818 | |
| 819 case COND_EXPR: | |
| 820 /* It is sometimes worthwhile to push the narrowing down through | |
|
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821 the conditional and never loses. A COND_EXPR may have a throw |
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822 as one operand, which then has void type. Just leave void |
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823 operands as they are. */ |
| 0 | 824 return fold_build3 (COND_EXPR, type, TREE_OPERAND (expr, 0), |
|
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825 VOID_TYPE_P (TREE_TYPE (TREE_OPERAND (expr, 1))) |
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826 ? TREE_OPERAND (expr, 1) |
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827 : convert (type, TREE_OPERAND (expr, 1)), |
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828 VOID_TYPE_P (TREE_TYPE (TREE_OPERAND (expr, 2))) |
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829 ? TREE_OPERAND (expr, 2) |
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|
830 : convert (type, TREE_OPERAND (expr, 2))); |
| 0 | 831 |
| 832 default: | |
| 833 break; | |
| 834 } | |
| 835 | |
| 836 return build1 (CONVERT_EXPR, type, expr); | |
| 837 | |
| 838 case REAL_TYPE: | |
| 839 return build1 (FIX_TRUNC_EXPR, type, expr); | |
| 840 | |
| 841 case FIXED_POINT_TYPE: | |
| 842 return build1 (FIXED_CONVERT_EXPR, type, expr); | |
| 843 | |
| 844 case COMPLEX_TYPE: | |
| 845 return convert (type, | |
| 846 fold_build1 (REALPART_EXPR, | |
| 847 TREE_TYPE (TREE_TYPE (expr)), expr)); | |
| 848 | |
| 849 case VECTOR_TYPE: | |
| 850 if (!tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (TREE_TYPE (expr)))) | |
| 851 { | |
| 852 error ("can't convert between vector values of different size"); | |
| 853 return error_mark_node; | |
| 854 } | |
| 855 return build1 (VIEW_CONVERT_EXPR, type, expr); | |
| 856 | |
| 857 default: | |
| 858 error ("aggregate value used where an integer was expected"); | |
| 859 return convert (type, integer_zero_node); | |
| 860 } | |
| 861 } | |
| 862 | |
| 863 /* Convert EXPR to the complex type TYPE in the usual ways. */ | |
| 864 | |
| 865 tree | |
| 866 convert_to_complex (tree type, tree expr) | |
| 867 { | |
| 868 tree subtype = TREE_TYPE (type); | |
| 869 | |
| 870 switch (TREE_CODE (TREE_TYPE (expr))) | |
| 871 { | |
| 872 case REAL_TYPE: | |
| 873 case FIXED_POINT_TYPE: | |
| 874 case INTEGER_TYPE: | |
| 875 case ENUMERAL_TYPE: | |
| 876 case BOOLEAN_TYPE: | |
| 877 return build2 (COMPLEX_EXPR, type, convert (subtype, expr), | |
| 878 convert (subtype, integer_zero_node)); | |
| 879 | |
| 880 case COMPLEX_TYPE: | |
| 881 { | |
| 882 tree elt_type = TREE_TYPE (TREE_TYPE (expr)); | |
| 883 | |
| 884 if (TYPE_MAIN_VARIANT (elt_type) == TYPE_MAIN_VARIANT (subtype)) | |
| 885 return expr; | |
| 886 else if (TREE_CODE (expr) == COMPLEX_EXPR) | |
| 887 return fold_build2 (COMPLEX_EXPR, type, | |
| 888 convert (subtype, TREE_OPERAND (expr, 0)), | |
| 889 convert (subtype, TREE_OPERAND (expr, 1))); | |
| 890 else | |
| 891 { | |
| 892 expr = save_expr (expr); | |
| 893 return | |
| 894 fold_build2 (COMPLEX_EXPR, type, | |
| 895 convert (subtype, | |
| 896 fold_build1 (REALPART_EXPR, | |
| 897 TREE_TYPE (TREE_TYPE (expr)), | |
| 898 expr)), | |
| 899 convert (subtype, | |
| 900 fold_build1 (IMAGPART_EXPR, | |
| 901 TREE_TYPE (TREE_TYPE (expr)), | |
| 902 expr))); | |
| 903 } | |
| 904 } | |
| 905 | |
| 906 case POINTER_TYPE: | |
| 907 case REFERENCE_TYPE: | |
| 908 error ("pointer value used where a complex was expected"); | |
| 909 return convert_to_complex (type, integer_zero_node); | |
| 910 | |
| 911 default: | |
| 912 error ("aggregate value used where a complex was expected"); | |
| 913 return convert_to_complex (type, integer_zero_node); | |
| 914 } | |
| 915 } | |
| 916 | |
| 917 /* Convert EXPR to the vector type TYPE in the usual ways. */ | |
| 918 | |
| 919 tree | |
| 920 convert_to_vector (tree type, tree expr) | |
| 921 { | |
| 922 switch (TREE_CODE (TREE_TYPE (expr))) | |
| 923 { | |
| 924 case INTEGER_TYPE: | |
| 925 case VECTOR_TYPE: | |
| 926 if (!tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (TREE_TYPE (expr)))) | |
| 927 { | |
| 928 error ("can't convert between vector values of different size"); | |
| 929 return error_mark_node; | |
| 930 } | |
| 931 return build1 (VIEW_CONVERT_EXPR, type, expr); | |
| 932 | |
| 933 default: | |
| 934 error ("can't convert value to a vector"); | |
| 935 return error_mark_node; | |
| 936 } | |
| 937 } | |
| 938 | |
| 939 /* Convert EXPR to some fixed-point type TYPE. | |
| 940 | |
| 941 EXPR must be fixed-point, float, integer, or enumeral; | |
| 942 in other cases error is called. */ | |
| 943 | |
| 944 tree | |
| 945 convert_to_fixed (tree type, tree expr) | |
| 946 { | |
| 947 if (integer_zerop (expr)) | |
| 948 { | |
| 949 tree fixed_zero_node = build_fixed (type, FCONST0 (TYPE_MODE (type))); | |
| 950 return fixed_zero_node; | |
| 951 } | |
| 952 else if (integer_onep (expr) && ALL_SCALAR_ACCUM_MODE_P (TYPE_MODE (type))) | |
| 953 { | |
| 954 tree fixed_one_node = build_fixed (type, FCONST1 (TYPE_MODE (type))); | |
| 955 return fixed_one_node; | |
| 956 } | |
| 957 | |
| 958 switch (TREE_CODE (TREE_TYPE (expr))) | |
| 959 { | |
| 960 case FIXED_POINT_TYPE: | |
| 961 case INTEGER_TYPE: | |
| 962 case ENUMERAL_TYPE: | |
| 963 case BOOLEAN_TYPE: | |
| 964 case REAL_TYPE: | |
| 965 return build1 (FIXED_CONVERT_EXPR, type, expr); | |
| 966 | |
| 967 case COMPLEX_TYPE: | |
| 968 return convert (type, | |
| 969 fold_build1 (REALPART_EXPR, | |
| 970 TREE_TYPE (TREE_TYPE (expr)), expr)); | |
| 971 | |
| 972 default: | |
| 973 error ("aggregate value used where a fixed-point was expected"); | |
| 974 return error_mark_node; | |
| 975 } | |
| 976 } |