Mercurial > hg > CbC > CbC_gcc
annotate gcc/convert.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | b7f97abdc517 |
| children | 04ced10e8804 |
| 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" | |
|
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33 #include "diagnostic-core.h" |
| 0 | 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)) | |
|
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49 return force_fit_type_double (type, double_int_zero, 0, |
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50 TREE_OVERFLOW (expr)); |
| 0 | 51 |
| 52 switch (TREE_CODE (TREE_TYPE (expr))) | |
| 53 { | |
| 54 case POINTER_TYPE: | |
| 55 case REFERENCE_TYPE: | |
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56 { |
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57 /* If the pointers point to different address spaces, conversion needs |
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58 to be done via a ADDR_SPACE_CONVERT_EXPR instead of a NOP_EXPR. */ |
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59 addr_space_t to_as = TYPE_ADDR_SPACE (TREE_TYPE (type)); |
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60 addr_space_t from_as = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (expr))); |
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61 |
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62 if (to_as == from_as) |
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63 return fold_build1_loc (loc, NOP_EXPR, type, expr); |
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64 else |
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65 return fold_build1_loc (loc, ADDR_SPACE_CONVERT_EXPR, type, expr); |
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66 } |
| 0 | 67 |
| 68 case INTEGER_TYPE: | |
| 69 case ENUMERAL_TYPE: | |
| 70 case BOOLEAN_TYPE: | |
|
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71 { |
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72 /* If the input precision differs from the target pointer type |
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73 precision, first convert the input expression to an integer type of |
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74 the target precision. Some targets, e.g. VMS, need several pointer |
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75 sizes to coexist so the latter isn't necessarily POINTER_SIZE. */ |
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76 unsigned int pprec = TYPE_PRECISION (type); |
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77 unsigned int eprec = TYPE_PRECISION (TREE_TYPE (expr)); |
| 0 | 78 |
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79 if (eprec != pprec) |
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80 expr = fold_build1_loc (loc, NOP_EXPR, |
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81 lang_hooks.types.type_for_size (pprec, 0), |
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82 expr); |
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83 } |
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84 |
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85 return fold_build1_loc (loc, CONVERT_EXPR, type, expr); |
| 0 | 86 |
| 87 default: | |
| 88 error ("cannot convert to a pointer type"); | |
| 89 return convert_to_pointer (type, integer_zero_node); | |
| 90 } | |
| 91 } | |
| 92 | |
| 93 /* Avoid any floating point extensions from EXP. */ | |
| 94 tree | |
| 95 strip_float_extensions (tree exp) | |
| 96 { | |
| 97 tree sub, expt, subt; | |
| 98 | |
| 99 /* For floating point constant look up the narrowest type that can hold | |
| 100 it properly and handle it like (type)(narrowest_type)constant. | |
| 101 This way we can optimize for instance a=a*2.0 where "a" is float | |
| 102 but 2.0 is double constant. */ | |
| 103 if (TREE_CODE (exp) == REAL_CST && !DECIMAL_FLOAT_TYPE_P (TREE_TYPE (exp))) | |
| 104 { | |
| 105 REAL_VALUE_TYPE orig; | |
| 106 tree type = NULL; | |
| 107 | |
| 108 orig = TREE_REAL_CST (exp); | |
| 109 if (TYPE_PRECISION (TREE_TYPE (exp)) > TYPE_PRECISION (float_type_node) | |
| 110 && exact_real_truncate (TYPE_MODE (float_type_node), &orig)) | |
| 111 type = float_type_node; | |
| 112 else if (TYPE_PRECISION (TREE_TYPE (exp)) | |
| 113 > TYPE_PRECISION (double_type_node) | |
| 114 && exact_real_truncate (TYPE_MODE (double_type_node), &orig)) | |
| 115 type = double_type_node; | |
| 116 if (type) | |
| 117 return build_real (type, real_value_truncate (TYPE_MODE (type), orig)); | |
| 118 } | |
| 119 | |
| 120 if (!CONVERT_EXPR_P (exp)) | |
| 121 return exp; | |
| 122 | |
| 123 sub = TREE_OPERAND (exp, 0); | |
| 124 subt = TREE_TYPE (sub); | |
| 125 expt = TREE_TYPE (exp); | |
| 126 | |
| 127 if (!FLOAT_TYPE_P (subt)) | |
| 128 return exp; | |
| 129 | |
| 130 if (DECIMAL_FLOAT_TYPE_P (expt) != DECIMAL_FLOAT_TYPE_P (subt)) | |
| 131 return exp; | |
| 132 | |
| 133 if (TYPE_PRECISION (subt) > TYPE_PRECISION (expt)) | |
| 134 return exp; | |
| 135 | |
| 136 return strip_float_extensions (sub); | |
| 137 } | |
| 138 | |
| 139 | |
| 140 /* Convert EXPR to some floating-point type TYPE. | |
| 141 | |
| 142 EXPR must be float, fixed-point, integer, or enumeral; | |
| 143 in other cases error is called. */ | |
| 144 | |
| 145 tree | |
| 146 convert_to_real (tree type, tree expr) | |
| 147 { | |
| 148 enum built_in_function fcode = builtin_mathfn_code (expr); | |
| 149 tree itype = TREE_TYPE (expr); | |
| 150 | |
| 151 /* Disable until we figure out how to decide whether the functions are | |
| 152 present in runtime. */ | |
| 153 /* Convert (float)sqrt((double)x) where x is float into sqrtf(x) */ | |
| 154 if (optimize | |
| 155 && (TYPE_MODE (type) == TYPE_MODE (double_type_node) | |
| 156 || TYPE_MODE (type) == TYPE_MODE (float_type_node))) | |
| 157 { | |
| 158 switch (fcode) | |
| 159 { | |
| 160 #define CASE_MATHFN(FN) case BUILT_IN_##FN: case BUILT_IN_##FN##L: | |
| 161 CASE_MATHFN (COSH) | |
| 162 CASE_MATHFN (EXP) | |
| 163 CASE_MATHFN (EXP10) | |
| 164 CASE_MATHFN (EXP2) | |
| 165 CASE_MATHFN (EXPM1) | |
| 166 CASE_MATHFN (GAMMA) | |
| 167 CASE_MATHFN (J0) | |
| 168 CASE_MATHFN (J1) | |
| 169 CASE_MATHFN (LGAMMA) | |
| 170 CASE_MATHFN (POW10) | |
| 171 CASE_MATHFN (SINH) | |
| 172 CASE_MATHFN (TGAMMA) | |
| 173 CASE_MATHFN (Y0) | |
| 174 CASE_MATHFN (Y1) | |
| 175 /* The above functions may set errno differently with float | |
| 176 input or output so this transformation is not safe with | |
| 177 -fmath-errno. */ | |
| 178 if (flag_errno_math) | |
| 179 break; | |
| 180 CASE_MATHFN (ACOS) | |
| 181 CASE_MATHFN (ACOSH) | |
| 182 CASE_MATHFN (ASIN) | |
| 183 CASE_MATHFN (ASINH) | |
| 184 CASE_MATHFN (ATAN) | |
| 185 CASE_MATHFN (ATANH) | |
| 186 CASE_MATHFN (CBRT) | |
| 187 CASE_MATHFN (COS) | |
| 188 CASE_MATHFN (ERF) | |
| 189 CASE_MATHFN (ERFC) | |
| 190 CASE_MATHFN (FABS) | |
| 191 CASE_MATHFN (LOG) | |
| 192 CASE_MATHFN (LOG10) | |
| 193 CASE_MATHFN (LOG2) | |
| 194 CASE_MATHFN (LOG1P) | |
| 195 CASE_MATHFN (LOGB) | |
| 196 CASE_MATHFN (SIN) | |
| 197 CASE_MATHFN (SQRT) | |
| 198 CASE_MATHFN (TAN) | |
| 199 CASE_MATHFN (TANH) | |
| 200 #undef CASE_MATHFN | |
| 201 { | |
| 202 tree arg0 = strip_float_extensions (CALL_EXPR_ARG (expr, 0)); | |
| 203 tree newtype = type; | |
| 204 | |
| 205 /* We have (outertype)sqrt((innertype)x). Choose the wider mode from | |
| 206 the both as the safe type for operation. */ | |
| 207 if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (type)) | |
| 208 newtype = TREE_TYPE (arg0); | |
| 209 | |
| 210 /* Be careful about integer to fp conversions. | |
| 211 These may overflow still. */ | |
| 212 if (FLOAT_TYPE_P (TREE_TYPE (arg0)) | |
| 213 && TYPE_PRECISION (newtype) < TYPE_PRECISION (itype) | |
| 214 && (TYPE_MODE (newtype) == TYPE_MODE (double_type_node) | |
| 215 || TYPE_MODE (newtype) == TYPE_MODE (float_type_node))) | |
| 216 { | |
| 217 tree fn = mathfn_built_in (newtype, fcode); | |
| 218 | |
| 219 if (fn) | |
| 220 { | |
| 221 tree arg = fold (convert_to_real (newtype, arg0)); | |
| 222 expr = build_call_expr (fn, 1, arg); | |
| 223 if (newtype == type) | |
| 224 return expr; | |
| 225 } | |
| 226 } | |
| 227 } | |
| 228 default: | |
| 229 break; | |
| 230 } | |
| 231 } | |
| 232 if (optimize | |
| 233 && (((fcode == BUILT_IN_FLOORL | |
| 234 || fcode == BUILT_IN_CEILL | |
| 235 || fcode == BUILT_IN_ROUNDL | |
| 236 || fcode == BUILT_IN_RINTL | |
| 237 || fcode == BUILT_IN_TRUNCL | |
| 238 || fcode == BUILT_IN_NEARBYINTL) | |
| 239 && (TYPE_MODE (type) == TYPE_MODE (double_type_node) | |
| 240 || TYPE_MODE (type) == TYPE_MODE (float_type_node))) | |
| 241 || ((fcode == BUILT_IN_FLOOR | |
| 242 || fcode == BUILT_IN_CEIL | |
| 243 || fcode == BUILT_IN_ROUND | |
| 244 || fcode == BUILT_IN_RINT | |
| 245 || fcode == BUILT_IN_TRUNC | |
| 246 || fcode == BUILT_IN_NEARBYINT) | |
| 247 && (TYPE_MODE (type) == TYPE_MODE (float_type_node))))) | |
| 248 { | |
| 249 tree fn = mathfn_built_in (type, fcode); | |
| 250 | |
| 251 if (fn) | |
| 252 { | |
| 253 tree arg = strip_float_extensions (CALL_EXPR_ARG (expr, 0)); | |
| 254 | |
| 255 /* Make sure (type)arg0 is an extension, otherwise we could end up | |
| 256 changing (float)floor(double d) into floorf((float)d), which is | |
| 257 incorrect because (float)d uses round-to-nearest and can round | |
| 258 up to the next integer. */ | |
| 259 if (TYPE_PRECISION (type) >= TYPE_PRECISION (TREE_TYPE (arg))) | |
| 260 return build_call_expr (fn, 1, fold (convert_to_real (type, arg))); | |
| 261 } | |
| 262 } | |
| 263 | |
| 264 /* Propagate the cast into the operation. */ | |
| 265 if (itype != type && FLOAT_TYPE_P (type)) | |
| 266 switch (TREE_CODE (expr)) | |
| 267 { | |
| 268 /* Convert (float)-x into -(float)x. This is safe for | |
| 269 round-to-nearest rounding mode. */ | |
| 270 case ABS_EXPR: | |
| 271 case NEGATE_EXPR: | |
| 272 if (!flag_rounding_math | |
| 273 && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr))) | |
| 274 return build1 (TREE_CODE (expr), type, | |
| 275 fold (convert_to_real (type, | |
| 276 TREE_OPERAND (expr, 0)))); | |
| 277 break; | |
| 278 /* Convert (outertype)((innertype0)a+(innertype1)b) | |
| 279 into ((newtype)a+(newtype)b) where newtype | |
| 280 is the widest mode from all of these. */ | |
| 281 case PLUS_EXPR: | |
| 282 case MINUS_EXPR: | |
| 283 case MULT_EXPR: | |
| 284 case RDIV_EXPR: | |
| 285 { | |
| 286 tree arg0 = strip_float_extensions (TREE_OPERAND (expr, 0)); | |
| 287 tree arg1 = strip_float_extensions (TREE_OPERAND (expr, 1)); | |
| 288 | |
| 289 if (FLOAT_TYPE_P (TREE_TYPE (arg0)) | |
| 290 && FLOAT_TYPE_P (TREE_TYPE (arg1)) | |
| 291 && DECIMAL_FLOAT_TYPE_P (itype) == DECIMAL_FLOAT_TYPE_P (type)) | |
| 292 { | |
| 293 tree newtype = type; | |
| 294 | |
| 295 if (TYPE_MODE (TREE_TYPE (arg0)) == SDmode | |
| 296 || TYPE_MODE (TREE_TYPE (arg1)) == SDmode | |
| 297 || TYPE_MODE (type) == SDmode) | |
| 298 newtype = dfloat32_type_node; | |
| 299 if (TYPE_MODE (TREE_TYPE (arg0)) == DDmode | |
| 300 || TYPE_MODE (TREE_TYPE (arg1)) == DDmode | |
| 301 || TYPE_MODE (type) == DDmode) | |
| 302 newtype = dfloat64_type_node; | |
| 303 if (TYPE_MODE (TREE_TYPE (arg0)) == TDmode | |
| 304 || TYPE_MODE (TREE_TYPE (arg1)) == TDmode | |
| 305 || TYPE_MODE (type) == TDmode) | |
| 306 newtype = dfloat128_type_node; | |
| 307 if (newtype == dfloat32_type_node | |
| 308 || newtype == dfloat64_type_node | |
| 309 || newtype == dfloat128_type_node) | |
| 310 { | |
| 311 expr = build2 (TREE_CODE (expr), newtype, | |
| 312 fold (convert_to_real (newtype, arg0)), | |
| 313 fold (convert_to_real (newtype, arg1))); | |
| 314 if (newtype == type) | |
| 315 return expr; | |
| 316 break; | |
| 317 } | |
| 318 | |
| 319 if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (newtype)) | |
| 320 newtype = TREE_TYPE (arg0); | |
| 321 if (TYPE_PRECISION (TREE_TYPE (arg1)) > TYPE_PRECISION (newtype)) | |
| 322 newtype = TREE_TYPE (arg1); | |
| 323 /* Sometimes this transformation is safe (cannot | |
| 324 change results through affecting double rounding | |
| 325 cases) and sometimes it is not. If NEWTYPE is | |
| 326 wider than TYPE, e.g. (float)((long double)double | |
| 327 + (long double)double) converted to | |
| 328 (float)(double + double), the transformation is | |
| 329 unsafe regardless of the details of the types | |
| 330 involved; double rounding can arise if the result | |
| 331 of NEWTYPE arithmetic is a NEWTYPE value half way | |
| 332 between two representable TYPE values but the | |
| 333 exact value is sufficiently different (in the | |
| 334 right direction) for this difference to be | |
| 335 visible in ITYPE arithmetic. If NEWTYPE is the | |
| 336 same as TYPE, however, the transformation may be | |
| 337 safe depending on the types involved: it is safe | |
| 338 if the ITYPE has strictly more than twice as many | |
| 339 mantissa bits as TYPE, can represent infinities | |
| 340 and NaNs if the TYPE can, and has sufficient | |
| 341 exponent range for the product or ratio of two | |
| 342 values representable in the TYPE to be within the | |
| 343 range of normal values of ITYPE. */ | |
| 344 if (TYPE_PRECISION (newtype) < TYPE_PRECISION (itype) | |
| 345 && (flag_unsafe_math_optimizations | |
| 346 || (TYPE_PRECISION (newtype) == TYPE_PRECISION (type) | |
| 347 && real_can_shorten_arithmetic (TYPE_MODE (itype), | |
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348 TYPE_MODE (type)) |
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349 && !excess_precision_type (newtype)))) |
| 0 | 350 { |
| 351 expr = build2 (TREE_CODE (expr), newtype, | |
| 352 fold (convert_to_real (newtype, arg0)), | |
| 353 fold (convert_to_real (newtype, arg1))); | |
| 354 if (newtype == type) | |
| 355 return expr; | |
| 356 } | |
| 357 } | |
| 358 } | |
| 359 break; | |
| 360 default: | |
| 361 break; | |
| 362 } | |
| 363 | |
| 364 switch (TREE_CODE (TREE_TYPE (expr))) | |
| 365 { | |
| 366 case REAL_TYPE: | |
| 367 /* Ignore the conversion if we don't need to store intermediate | |
| 368 results and neither type is a decimal float. */ | |
| 369 return build1 ((flag_float_store | |
| 370 || DECIMAL_FLOAT_TYPE_P (type) | |
| 371 || DECIMAL_FLOAT_TYPE_P (itype)) | |
| 372 ? CONVERT_EXPR : NOP_EXPR, type, expr); | |
| 373 | |
| 374 case INTEGER_TYPE: | |
| 375 case ENUMERAL_TYPE: | |
| 376 case BOOLEAN_TYPE: | |
| 377 return build1 (FLOAT_EXPR, type, expr); | |
| 378 | |
| 379 case FIXED_POINT_TYPE: | |
| 380 return build1 (FIXED_CONVERT_EXPR, type, expr); | |
| 381 | |
| 382 case COMPLEX_TYPE: | |
| 383 return convert (type, | |
| 384 fold_build1 (REALPART_EXPR, | |
| 385 TREE_TYPE (TREE_TYPE (expr)), expr)); | |
| 386 | |
| 387 case POINTER_TYPE: | |
| 388 case REFERENCE_TYPE: | |
| 389 error ("pointer value used where a floating point value was expected"); | |
| 390 return convert_to_real (type, integer_zero_node); | |
| 391 | |
| 392 default: | |
| 393 error ("aggregate value used where a float was expected"); | |
| 394 return convert_to_real (type, integer_zero_node); | |
| 395 } | |
| 396 } | |
| 397 | |
| 398 /* Convert EXPR to some integer (or enum) type TYPE. | |
| 399 | |
| 400 EXPR must be pointer, integer, discrete (enum, char, or bool), float, | |
| 401 fixed-point or vector; in other cases error is called. | |
| 402 | |
| 403 The result of this is always supposed to be a newly created tree node | |
| 404 not in use in any existing structure. */ | |
| 405 | |
| 406 tree | |
| 407 convert_to_integer (tree type, tree expr) | |
| 408 { | |
| 409 enum tree_code ex_form = TREE_CODE (expr); | |
| 410 tree intype = TREE_TYPE (expr); | |
| 411 unsigned int inprec = TYPE_PRECISION (intype); | |
| 412 unsigned int outprec = TYPE_PRECISION (type); | |
| 413 | |
| 414 /* An INTEGER_TYPE cannot be incomplete, but an ENUMERAL_TYPE can | |
| 415 be. Consider `enum E = { a, b = (enum E) 3 };'. */ | |
| 416 if (!COMPLETE_TYPE_P (type)) | |
| 417 { | |
| 418 error ("conversion to incomplete type"); | |
| 419 return error_mark_node; | |
| 420 } | |
| 421 | |
| 422 /* Convert e.g. (long)round(d) -> lround(d). */ | |
| 423 /* If we're converting to char, we may encounter differing behavior | |
| 424 between converting from double->char vs double->long->char. | |
| 425 We're in "undefined" territory but we prefer to be conservative, | |
| 426 so only proceed in "unsafe" math mode. */ | |
| 427 if (optimize | |
| 428 && (flag_unsafe_math_optimizations | |
| 429 || (long_integer_type_node | |
| 430 && outprec >= TYPE_PRECISION (long_integer_type_node)))) | |
| 431 { | |
| 432 tree s_expr = strip_float_extensions (expr); | |
| 433 tree s_intype = TREE_TYPE (s_expr); | |
| 434 const enum built_in_function fcode = builtin_mathfn_code (s_expr); | |
| 435 tree fn = 0; | |
|
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436 |
| 0 | 437 switch (fcode) |
| 438 { | |
| 439 CASE_FLT_FN (BUILT_IN_CEIL): | |
| 440 /* Only convert in ISO C99 mode. */ | |
| 441 if (!TARGET_C99_FUNCTIONS) | |
| 442 break; | |
| 443 if (outprec < TYPE_PRECISION (long_integer_type_node) | |
| 444 || (outprec == TYPE_PRECISION (long_integer_type_node) | |
| 445 && !TYPE_UNSIGNED (type))) | |
| 446 fn = mathfn_built_in (s_intype, BUILT_IN_LCEIL); | |
| 447 else if (outprec == TYPE_PRECISION (long_long_integer_type_node) | |
| 448 && !TYPE_UNSIGNED (type)) | |
| 449 fn = mathfn_built_in (s_intype, BUILT_IN_LLCEIL); | |
| 450 break; | |
| 451 | |
| 452 CASE_FLT_FN (BUILT_IN_FLOOR): | |
| 453 /* Only convert in ISO C99 mode. */ | |
| 454 if (!TARGET_C99_FUNCTIONS) | |
| 455 break; | |
| 456 if (outprec < TYPE_PRECISION (long_integer_type_node) | |
| 457 || (outprec == TYPE_PRECISION (long_integer_type_node) | |
| 458 && !TYPE_UNSIGNED (type))) | |
| 459 fn = mathfn_built_in (s_intype, BUILT_IN_LFLOOR); | |
| 460 else if (outprec == TYPE_PRECISION (long_long_integer_type_node) | |
| 461 && !TYPE_UNSIGNED (type)) | |
| 462 fn = mathfn_built_in (s_intype, BUILT_IN_LLFLOOR); | |
| 463 break; | |
| 464 | |
| 465 CASE_FLT_FN (BUILT_IN_ROUND): | |
| 466 if (outprec < TYPE_PRECISION (long_integer_type_node) | |
| 467 || (outprec == TYPE_PRECISION (long_integer_type_node) | |
| 468 && !TYPE_UNSIGNED (type))) | |
| 469 fn = mathfn_built_in (s_intype, BUILT_IN_LROUND); | |
| 470 else if (outprec == TYPE_PRECISION (long_long_integer_type_node) | |
| 471 && !TYPE_UNSIGNED (type)) | |
| 472 fn = mathfn_built_in (s_intype, BUILT_IN_LLROUND); | |
| 473 break; | |
| 474 | |
| 475 CASE_FLT_FN (BUILT_IN_NEARBYINT): | |
| 476 /* Only convert nearbyint* if we can ignore math exceptions. */ | |
| 477 if (flag_trapping_math) | |
| 478 break; | |
| 479 /* ... Fall through ... */ | |
| 480 CASE_FLT_FN (BUILT_IN_RINT): | |
| 481 if (outprec < TYPE_PRECISION (long_integer_type_node) | |
| 482 || (outprec == TYPE_PRECISION (long_integer_type_node) | |
| 483 && !TYPE_UNSIGNED (type))) | |
| 484 fn = mathfn_built_in (s_intype, BUILT_IN_LRINT); | |
| 485 else if (outprec == TYPE_PRECISION (long_long_integer_type_node) | |
| 486 && !TYPE_UNSIGNED (type)) | |
| 487 fn = mathfn_built_in (s_intype, BUILT_IN_LLRINT); | |
| 488 break; | |
| 489 | |
| 490 CASE_FLT_FN (BUILT_IN_TRUNC): | |
| 491 return convert_to_integer (type, CALL_EXPR_ARG (s_expr, 0)); | |
| 492 | |
| 493 default: | |
| 494 break; | |
| 495 } | |
|
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496 |
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497 if (fn) |
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498 { |
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499 tree newexpr = build_call_expr (fn, 1, CALL_EXPR_ARG (s_expr, 0)); |
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500 return convert_to_integer (type, newexpr); |
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501 } |
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502 } |
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503 |
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504 /* Convert (int)logb(d) -> ilogb(d). */ |
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505 if (optimize |
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506 && flag_unsafe_math_optimizations |
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507 && !flag_trapping_math && !flag_errno_math && flag_finite_math_only |
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508 && integer_type_node |
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509 && (outprec > TYPE_PRECISION (integer_type_node) |
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510 || (outprec == TYPE_PRECISION (integer_type_node) |
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511 && !TYPE_UNSIGNED (type)))) |
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512 { |
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513 tree s_expr = strip_float_extensions (expr); |
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514 tree s_intype = TREE_TYPE (s_expr); |
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515 const enum built_in_function fcode = builtin_mathfn_code (s_expr); |
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516 tree fn = 0; |
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517 |
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518 switch (fcode) |
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519 { |
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520 CASE_FLT_FN (BUILT_IN_LOGB): |
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521 fn = mathfn_built_in (s_intype, BUILT_IN_ILOGB); |
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522 break; |
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523 |
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524 default: |
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525 break; |
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526 } |
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527 |
| 0 | 528 if (fn) |
| 529 { | |
| 530 tree newexpr = build_call_expr (fn, 1, CALL_EXPR_ARG (s_expr, 0)); | |
| 531 return convert_to_integer (type, newexpr); | |
| 532 } | |
| 533 } | |
| 534 | |
| 535 switch (TREE_CODE (intype)) | |
| 536 { | |
| 537 case POINTER_TYPE: | |
| 538 case REFERENCE_TYPE: | |
| 539 if (integer_zerop (expr)) | |
| 540 return build_int_cst (type, 0); | |
| 541 | |
|
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542 /* Convert to an unsigned integer of the correct width first, and from |
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543 there widen/truncate to the required type. Some targets support the |
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544 coexistence of multiple valid pointer sizes, so fetch the one we need |
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545 from the type. */ |
| 0 | 546 expr = fold_build1 (CONVERT_EXPR, |
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547 lang_hooks.types.type_for_size |
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548 (TYPE_PRECISION (intype), 0), |
| 0 | 549 expr); |
| 550 return fold_convert (type, expr); | |
| 551 | |
| 552 case INTEGER_TYPE: | |
| 553 case ENUMERAL_TYPE: | |
| 554 case BOOLEAN_TYPE: | |
| 555 case OFFSET_TYPE: | |
| 556 /* If this is a logical operation, which just returns 0 or 1, we can | |
| 557 change the type of the expression. */ | |
| 558 | |
| 559 if (TREE_CODE_CLASS (ex_form) == tcc_comparison) | |
| 560 { | |
| 561 expr = copy_node (expr); | |
| 562 TREE_TYPE (expr) = type; | |
| 563 return expr; | |
| 564 } | |
| 565 | |
| 566 /* If we are widening the type, put in an explicit conversion. | |
| 567 Similarly if we are not changing the width. After this, we know | |
| 568 we are truncating EXPR. */ | |
| 569 | |
| 570 else if (outprec >= inprec) | |
| 571 { | |
| 572 enum tree_code code; | |
| 573 tree tem; | |
| 574 | |
| 575 /* If the precision of the EXPR's type is K bits and the | |
| 576 destination mode has more bits, and the sign is changing, | |
| 577 it is not safe to use a NOP_EXPR. For example, suppose | |
| 578 that EXPR's type is a 3-bit unsigned integer type, the | |
| 579 TYPE is a 3-bit signed integer type, and the machine mode | |
| 580 for the types is 8-bit QImode. In that case, the | |
| 581 conversion necessitates an explicit sign-extension. In | |
| 582 the signed-to-unsigned case the high-order bits have to | |
| 583 be cleared. */ | |
| 584 if (TYPE_UNSIGNED (type) != TYPE_UNSIGNED (TREE_TYPE (expr)) | |
| 585 && (TYPE_PRECISION (TREE_TYPE (expr)) | |
| 586 != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr))))) | |
| 587 code = CONVERT_EXPR; | |
| 588 else | |
| 589 code = NOP_EXPR; | |
| 590 | |
| 591 tem = fold_unary (code, type, expr); | |
| 592 if (tem) | |
| 593 return tem; | |
| 594 | |
| 595 tem = build1 (code, type, expr); | |
| 596 TREE_NO_WARNING (tem) = 1; | |
| 597 return tem; | |
| 598 } | |
| 599 | |
| 600 /* If TYPE is an enumeral type or a type with a precision less | |
| 601 than the number of bits in its mode, do the conversion to the | |
| 602 type corresponding to its mode, then do a nop conversion | |
| 603 to TYPE. */ | |
| 604 else if (TREE_CODE (type) == ENUMERAL_TYPE | |
| 605 || outprec != GET_MODE_BITSIZE (TYPE_MODE (type))) | |
| 606 return build1 (NOP_EXPR, type, | |
| 607 convert (lang_hooks.types.type_for_mode | |
| 608 (TYPE_MODE (type), TYPE_UNSIGNED (type)), | |
| 609 expr)); | |
| 610 | |
| 611 /* Here detect when we can distribute the truncation down past some | |
| 612 arithmetic. For example, if adding two longs and converting to an | |
| 613 int, we can equally well convert both to ints and then add. | |
| 614 For the operations handled here, such truncation distribution | |
| 615 is always safe. | |
| 616 It is desirable in these cases: | |
| 617 1) when truncating down to full-word from a larger size | |
| 618 2) when truncating takes no work. | |
| 619 3) when at least one operand of the arithmetic has been extended | |
| 620 (as by C's default conversions). In this case we need two conversions | |
| 621 if we do the arithmetic as already requested, so we might as well | |
| 622 truncate both and then combine. Perhaps that way we need only one. | |
| 623 | |
| 624 Note that in general we cannot do the arithmetic in a type | |
| 625 shorter than the desired result of conversion, even if the operands | |
| 626 are both extended from a shorter type, because they might overflow | |
| 627 if combined in that type. The exceptions to this--the times when | |
| 628 two narrow values can be combined in their narrow type even to | |
| 629 make a wider result--are handled by "shorten" in build_binary_op. */ | |
| 630 | |
| 631 switch (ex_form) | |
| 632 { | |
| 633 case RSHIFT_EXPR: | |
| 634 /* We can pass truncation down through right shifting | |
| 635 when the shift count is a nonpositive constant. */ | |
| 636 if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST | |
| 637 && tree_int_cst_sgn (TREE_OPERAND (expr, 1)) <= 0) | |
| 638 goto trunc1; | |
| 639 break; | |
| 640 | |
| 641 case LSHIFT_EXPR: | |
| 642 /* We can pass truncation down through left shifting | |
| 643 when the shift count is a nonnegative constant and | |
| 644 the target type is unsigned. */ | |
| 645 if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST | |
| 646 && tree_int_cst_sgn (TREE_OPERAND (expr, 1)) >= 0 | |
| 647 && TYPE_UNSIGNED (type) | |
| 648 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST) | |
| 649 { | |
| 650 /* If shift count is less than the width of the truncated type, | |
| 651 really shift. */ | |
| 652 if (tree_int_cst_lt (TREE_OPERAND (expr, 1), TYPE_SIZE (type))) | |
| 653 /* In this case, shifting is like multiplication. */ | |
| 654 goto trunc1; | |
| 655 else | |
| 656 { | |
| 657 /* If it is >= that width, result is zero. | |
| 658 Handling this with trunc1 would give the wrong result: | |
| 659 (int) ((long long) a << 32) is well defined (as 0) | |
| 660 but (int) a << 32 is undefined and would get a | |
| 661 warning. */ | |
| 662 | |
| 663 tree t = build_int_cst (type, 0); | |
| 664 | |
| 665 /* If the original expression had side-effects, we must | |
| 666 preserve it. */ | |
| 667 if (TREE_SIDE_EFFECTS (expr)) | |
| 668 return build2 (COMPOUND_EXPR, type, expr, t); | |
| 669 else | |
| 670 return t; | |
| 671 } | |
| 672 } | |
| 673 break; | |
| 674 | |
|
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675 case TRUNC_DIV_EXPR: |
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676 { |
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677 tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type); |
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678 tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type); |
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679 |
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680 /* Don't distribute unless the output precision is at least as big |
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681 as the actual inputs and it has the same signedness. */ |
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682 if (outprec >= TYPE_PRECISION (TREE_TYPE (arg0)) |
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683 && outprec >= TYPE_PRECISION (TREE_TYPE (arg1)) |
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684 /* If signedness of arg0 and arg1 don't match, |
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685 we can't necessarily find a type to compare them in. */ |
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686 && (TYPE_UNSIGNED (TREE_TYPE (arg0)) |
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687 == TYPE_UNSIGNED (TREE_TYPE (arg1))) |
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688 /* Do not change the sign of the division. */ |
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689 && (TYPE_UNSIGNED (TREE_TYPE (expr)) |
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690 == TYPE_UNSIGNED (TREE_TYPE (arg0))) |
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691 /* Either require unsigned division or a division by |
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692 a constant that is not -1. */ |
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693 && (TYPE_UNSIGNED (TREE_TYPE (arg0)) |
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694 || (TREE_CODE (arg1) == INTEGER_CST |
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695 && !integer_all_onesp (arg1)))) |
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696 goto trunc1; |
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697 break; |
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698 } |
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699 |
| 0 | 700 case MAX_EXPR: |
| 701 case MIN_EXPR: | |
| 702 case MULT_EXPR: | |
| 703 { | |
| 704 tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type); | |
| 705 tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type); | |
| 706 | |
| 707 /* Don't distribute unless the output precision is at least as big | |
| 708 as the actual inputs. Otherwise, the comparison of the | |
| 709 truncated values will be wrong. */ | |
| 710 if (outprec >= TYPE_PRECISION (TREE_TYPE (arg0)) | |
| 711 && outprec >= TYPE_PRECISION (TREE_TYPE (arg1)) | |
| 712 /* If signedness of arg0 and arg1 don't match, | |
| 713 we can't necessarily find a type to compare them in. */ | |
| 714 && (TYPE_UNSIGNED (TREE_TYPE (arg0)) | |
| 715 == TYPE_UNSIGNED (TREE_TYPE (arg1)))) | |
| 716 goto trunc1; | |
| 717 break; | |
| 718 } | |
| 719 | |
| 720 case PLUS_EXPR: | |
| 721 case MINUS_EXPR: | |
| 722 case BIT_AND_EXPR: | |
| 723 case BIT_IOR_EXPR: | |
| 724 case BIT_XOR_EXPR: | |
| 725 trunc1: | |
| 726 { | |
| 727 tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type); | |
| 728 tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type); | |
| 729 | |
| 730 if (outprec >= BITS_PER_WORD | |
| 731 || TRULY_NOOP_TRUNCATION (outprec, inprec) | |
| 732 || inprec > TYPE_PRECISION (TREE_TYPE (arg0)) | |
| 733 || inprec > TYPE_PRECISION (TREE_TYPE (arg1))) | |
| 734 { | |
| 735 /* Do the arithmetic in type TYPEX, | |
| 736 then convert result to TYPE. */ | |
| 737 tree typex = type; | |
| 738 | |
| 739 /* Can't do arithmetic in enumeral types | |
| 740 so use an integer type that will hold the values. */ | |
| 741 if (TREE_CODE (typex) == ENUMERAL_TYPE) | |
| 742 typex = lang_hooks.types.type_for_size | |
| 743 (TYPE_PRECISION (typex), TYPE_UNSIGNED (typex)); | |
| 744 | |
| 745 /* But now perhaps TYPEX is as wide as INPREC. | |
| 746 In that case, do nothing special here. | |
| 747 (Otherwise would recurse infinitely in convert. */ | |
| 748 if (TYPE_PRECISION (typex) != inprec) | |
| 749 { | |
| 750 /* Don't do unsigned arithmetic where signed was wanted, | |
| 751 or vice versa. | |
| 752 Exception: if both of the original operands were | |
| 753 unsigned then we can safely do the work as unsigned. | |
| 754 Exception: shift operations take their type solely | |
| 755 from the first argument. | |
| 756 Exception: the LSHIFT_EXPR case above requires that | |
| 757 we perform this operation unsigned lest we produce | |
| 758 signed-overflow undefinedness. | |
| 759 And we may need to do it as unsigned | |
| 760 if we truncate to the original size. */ | |
| 761 if (TYPE_UNSIGNED (TREE_TYPE (expr)) | |
| 762 || (TYPE_UNSIGNED (TREE_TYPE (arg0)) | |
| 763 && (TYPE_UNSIGNED (TREE_TYPE (arg1)) | |
| 764 || ex_form == LSHIFT_EXPR | |
| 765 || ex_form == RSHIFT_EXPR | |
| 766 || ex_form == LROTATE_EXPR | |
| 767 || ex_form == RROTATE_EXPR)) | |
| 768 || ex_form == LSHIFT_EXPR | |
| 769 /* If we have !flag_wrapv, and either ARG0 or | |
| 770 ARG1 is of a signed type, we have to do | |
|
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771 PLUS_EXPR, MINUS_EXPR or MULT_EXPR in an unsigned |
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|
772 type in case the operation in outprec precision |
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|
773 could overflow. Otherwise, we would introduce |
| 0 | 774 signed-overflow undefinedness. */ |
| 775 || ((!TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0)) | |
| 776 || !TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg1))) | |
|
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777 && ((TYPE_PRECISION (TREE_TYPE (arg0)) * 2u |
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|
778 > outprec) |
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779 || (TYPE_PRECISION (TREE_TYPE (arg1)) * 2u |
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780 > outprec)) |
| 0 | 781 && (ex_form == PLUS_EXPR |
|
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782 || ex_form == MINUS_EXPR |
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783 || ex_form == MULT_EXPR))) |
| 0 | 784 typex = unsigned_type_for (typex); |
| 785 else | |
| 786 typex = signed_type_for (typex); | |
| 787 return convert (type, | |
| 788 fold_build2 (ex_form, typex, | |
| 789 convert (typex, arg0), | |
| 790 convert (typex, arg1))); | |
| 791 } | |
| 792 } | |
| 793 } | |
| 794 break; | |
| 795 | |
| 796 case NEGATE_EXPR: | |
| 797 case BIT_NOT_EXPR: | |
| 798 /* This is not correct for ABS_EXPR, | |
| 799 since we must test the sign before truncation. */ | |
| 800 { | |
|
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|
801 tree typex = unsigned_type_for (type); |
| 0 | 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), |
|
19
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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 { | |
|
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changeset
|
852 error ("can%'t convert between vector values of different size"); |
| 0 | 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 { | |
|
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diff
changeset
|
928 error ("can%'t convert between vector values of different size"); |
| 0 | 929 return error_mark_node; |
| 930 } | |
| 931 return build1 (VIEW_CONVERT_EXPR, type, expr); | |
| 932 | |
| 933 default: | |
|
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|
934 error ("can%'t convert value to a vector"); |
| 0 | 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 } |