1 /* AIX FPU-related code. 2 Copyright (C) 2005-2020 Free Software Foundation, Inc. 3 Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr> 4 5 This file is part of the GNU Fortran runtime library (libgfortran). 6 7 Libgfortran is free software; you can redistribute it and/or 8 modify it under the terms of the GNU General Public 9 License as published by the Free Software Foundation; either 10 version 3 of the License, or (at your option) any later version. 11 12 Libgfortran is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26 27 /* FPU-related code for AIX. */ 28 #ifdef HAVE_FPTRAP_H 29 #include <fptrap.h> 30 #endif 31 32 #ifdef HAVE_FPXCP_H 33 #include <fpxcp.h> 34 #endif 35 36 #ifdef HAVE_FENV_H 37 #include <fenv.h> 38 #endif 39 40 41 /* Check we can actually store the FPU state in the allocated size. */ 42 _Static_assert (sizeof(fenv_t) <= (size_t) GFC_FPE_STATE_BUFFER_SIZE, 43 "GFC_FPE_STATE_BUFFER_SIZE is too small"); 44 45 46 void 47 set_fpu_trap_exceptions (int trap, int notrap) 48 { 49 fptrap_t mode_set = 0, mode_clr = 0; 50 51 #ifdef TRP_INVALID 52 if (trap & GFC_FPE_INVALID) 53 mode_set |= TRP_INVALID; 54 if (notrap & GFC_FPE_INVALID) 55 mode_clr |= TRP_INVALID; 56 #endif 57 58 #ifdef TRP_DIV_BY_ZERO 59 if (trap & GFC_FPE_ZERO) 60 mode_set |= TRP_DIV_BY_ZERO; 61 if (notrap & GFC_FPE_ZERO) 62 mode_clr |= TRP_DIV_BY_ZERO; 63 #endif 64 65 #ifdef TRP_OVERFLOW 66 if (trap & GFC_FPE_OVERFLOW) 67 mode_set |= TRP_OVERFLOW; 68 if (notrap & GFC_FPE_OVERFLOW) 69 mode_clr |= TRP_OVERFLOW; 70 #endif 71 72 #ifdef TRP_UNDERFLOW 73 if (trap & GFC_FPE_UNDERFLOW) 74 mode_set |= TRP_UNDERFLOW; 75 if (notrap & GFC_FPE_UNDERFLOW) 76 mode_clr |= TRP_UNDERFLOW; 77 #endif 78 79 #ifdef TRP_INEXACT 80 if (trap & GFC_FPE_INEXACT) 81 mode_set |= TRP_INEXACT; 82 if (notrap & GFC_FPE_INEXACT) 83 mode_clr |= TRP_INEXACT; 84 #endif 85 86 fp_trap (FP_TRAP_SYNC); 87 fp_enable (mode_set); 88 fp_disable (mode_clr); 89 } 90 91 92 int 93 get_fpu_trap_exceptions (void) 94 { 95 int res = 0; 96 97 #ifdef TRP_INVALID 98 if (fp_is_enabled (TRP_INVALID)) 99 res |= GFC_FPE_INVALID; 100 #endif 101 102 #ifdef TRP_DIV_BY_ZERO 103 if (fp_is_enabled (TRP_DIV_BY_ZERO)) 104 res |= GFC_FPE_ZERO; 105 #endif 106 107 #ifdef TRP_OVERFLOW 108 if (fp_is_enabled (TRP_OVERFLOW)) 109 res |= GFC_FPE_OVERFLOW; 110 #endif 111 112 #ifdef TRP_UNDERFLOW 113 if (fp_is_enabled (TRP_UNDERFLOW)) 114 res |= GFC_FPE_UNDERFLOW; 115 #endif 116 117 #ifdef TRP_INEXACT 118 if (fp_is_enabled (TRP_INEXACT)) 119 res |= GFC_FPE_INEXACT; 120 #endif 121 122 return res; 123 } 124 125 126 int 127 support_fpu_trap (int flag) 128 { 129 return support_fpu_flag (flag); 130 } 131 132 133 void 134 set_fpu (void) 135 { 136 #ifndef TRP_INVALID 137 if (options.fpe & GFC_FPE_INVALID) 138 estr_write ("Fortran runtime warning: IEEE 'invalid operation' " 139 "exception not supported.\n"); 140 #endif 141 142 if (options.fpe & GFC_FPE_DENORMAL) 143 estr_write ("Fortran runtime warning: Floating point 'denormal operand' " 144 "exception not supported.\n"); 145 146 #ifndef TRP_DIV_BY_ZERO 147 if (options.fpe & GFC_FPE_ZERO) 148 estr_write ("Fortran runtime warning: IEEE 'division by zero' " 149 "exception not supported.\n"); 150 #endif 151 152 #ifndef TRP_OVERFLOW 153 if (options.fpe & GFC_FPE_OVERFLOW) 154 estr_write ("Fortran runtime warning: IEEE 'overflow' " 155 "exception not supported.\n"); 156 #endif 157 158 #ifndef TRP_UNDERFLOW 159 if (options.fpe & GFC_FPE_UNDERFLOW) 160 estr_write ("Fortran runtime warning: IEEE 'underflow' " 161 "exception not supported.\n"); 162 #endif 163 164 #ifndef TRP_INEXACT 165 if (options.fpe & GFC_FPE_INEXACT) 166 estr_write ("Fortran runtime warning: IEEE 'inexact' " 167 "exception not supported.\n"); 168 #endif 169 170 set_fpu_trap_exceptions (options.fpe, 0); 171 } 172 173 int 174 get_fpu_except_flags (void) 175 { 176 int result, set_excepts; 177 178 result = 0; 179 180 #ifdef HAVE_FPXCP_H 181 if (!fp_any_xcp ()) 182 return 0; 183 184 if (fp_invalid_op ()) 185 result |= GFC_FPE_INVALID; 186 187 if (fp_divbyzero ()) 188 result |= GFC_FPE_ZERO; 189 190 if (fp_overflow ()) 191 result |= GFC_FPE_OVERFLOW; 192 193 if (fp_underflow ()) 194 result |= GFC_FPE_UNDERFLOW; 195 196 if (fp_inexact ()) 197 result |= GFC_FPE_INEXACT; 198 #endif 199 200 return result; 201 } 202 203 204 void 205 set_fpu_except_flags (int set, int clear) 206 { 207 int exc_set = 0, exc_clr = 0; 208 209 #ifdef FP_INVALID 210 if (set & GFC_FPE_INVALID) 211 exc_set |= FP_INVALID; 212 else if (clear & GFC_FPE_INVALID) 213 exc_clr |= FP_INVALID; 214 #endif 215 216 #ifdef FP_DIV_BY_ZERO 217 if (set & GFC_FPE_ZERO) 218 exc_set |= FP_DIV_BY_ZERO; 219 else if (clear & GFC_FPE_ZERO) 220 exc_clr |= FP_DIV_BY_ZERO; 221 #endif 222 223 #ifdef FP_OVERFLOW 224 if (set & GFC_FPE_OVERFLOW) 225 exc_set |= FP_OVERFLOW; 226 else if (clear & GFC_FPE_OVERFLOW) 227 exc_clr |= FP_OVERFLOW; 228 #endif 229 230 #ifdef FP_UNDERFLOW 231 if (set & GFC_FPE_UNDERFLOW) 232 exc_set |= FP_UNDERFLOW; 233 else if (clear & GFC_FPE_UNDERFLOW) 234 exc_clr |= FP_UNDERFLOW; 235 #endif 236 237 /* AIX does not have FP_DENORMAL. */ 238 239 #ifdef FP_INEXACT 240 if (set & GFC_FPE_INEXACT) 241 exc_set |= FP_INEXACT; 242 else if (clear & GFC_FPE_INEXACT) 243 exc_clr |= FP_INEXACT; 244 #endif 245 246 fp_clr_flag (exc_clr); 247 fp_set_flag (exc_set); 248 } 249 250 251 int 252 support_fpu_flag (int flag) 253 { 254 if (flag & GFC_FPE_INVALID) 255 { 256 #ifndef FP_INVALID 257 return 0; 258 #endif 259 } 260 else if (flag & GFC_FPE_ZERO) 261 { 262 #ifndef FP_DIV_BY_ZERO 263 return 0; 264 #endif 265 } 266 else if (flag & GFC_FPE_OVERFLOW) 267 { 268 #ifndef FP_OVERFLOW 269 return 0; 270 #endif 271 } 272 else if (flag & GFC_FPE_UNDERFLOW) 273 { 274 #ifndef FP_UNDERFLOW 275 return 0; 276 #endif 277 } 278 else if (flag & GFC_FPE_DENORMAL) 279 { 280 /* AIX does not support denormal flag. */ 281 return 0; 282 } 283 else if (flag & GFC_FPE_INEXACT) 284 { 285 #ifndef FP_INEXACT 286 return 0; 287 #endif 288 } 289 290 return 1; 291 } 292 293 294 int 295 get_fpu_rounding_mode (void) 296 { 297 int rnd_mode; 298 299 rnd_mode = fegetround (); 300 301 switch (rnd_mode) 302 { 303 #ifdef FE_TONEAREST 304 case FE_TONEAREST: 305 return GFC_FPE_TONEAREST; 306 #endif 307 308 #ifdef FE_UPWARD 309 case FE_UPWARD: 310 return GFC_FPE_UPWARD; 311 #endif 312 313 #ifdef FE_DOWNWARD 314 case FE_DOWNWARD: 315 return GFC_FPE_DOWNWARD; 316 #endif 317 318 #ifdef FE_TOWARDZERO 319 case FE_TOWARDZERO: 320 return GFC_FPE_TOWARDZERO; 321 #endif 322 323 default: 324 return 0; /* Should be unreachable. */ 325 } 326 } 327 328 329 void 330 set_fpu_rounding_mode (int mode) 331 { 332 int rnd_mode; 333 334 switch (mode) 335 { 336 #ifdef FE_TONEAREST 337 case GFC_FPE_TONEAREST: 338 rnd_mode = FE_TONEAREST; 339 break; 340 #endif 341 342 #ifdef FE_UPWARD 343 case GFC_FPE_UPWARD: 344 rnd_mode = FE_UPWARD; 345 break; 346 #endif 347 348 #ifdef FE_DOWNWARD 349 case GFC_FPE_DOWNWARD: 350 rnd_mode = FE_DOWNWARD; 351 break; 352 #endif 353 354 #ifdef FE_TOWARDZERO 355 case GFC_FPE_TOWARDZERO: 356 rnd_mode = FE_TOWARDZERO; 357 break; 358 #endif 359 360 default: 361 return; /* Should be unreachable. */ 362 } 363 364 fesetround (rnd_mode); 365 } 366 367 368 int 369 support_fpu_rounding_mode (int mode) 370 { 371 switch (mode) 372 { 373 case GFC_FPE_TONEAREST: 374 #ifdef FE_TONEAREST 375 return 1; 376 #else 377 return 0; 378 #endif 379 380 case GFC_FPE_UPWARD: 381 #ifdef FE_UPWARD 382 return 1; 383 #else 384 return 0; 385 #endif 386 387 case GFC_FPE_DOWNWARD: 388 #ifdef FE_DOWNWARD 389 return 1; 390 #else 391 return 0; 392 #endif 393 394 case GFC_FPE_TOWARDZERO: 395 #ifdef FE_TOWARDZERO 396 return 1; 397 #else 398 return 0; 399 #endif 400 401 default: 402 return 0; /* Should be unreachable. */ 403 } 404 } 405 406 407 408 void 409 get_fpu_state (void *state) 410 { 411 fegetenv (state); 412 } 413 414 void 415 set_fpu_state (void *state) 416 { 417 fesetenv (state); 418 } 419 420 421 int 422 support_fpu_underflow_control (int kind __attribute__((unused))) 423 { 424 return 0; 425 } 426 427 428 int 429 get_fpu_underflow_mode (void) 430 { 431 return 0; 432 } 433 434 435 void 436 set_fpu_underflow_mode (int gradual __attribute__((unused))) 437 { 438 } 439 440