1 /* 2 * S/390 FPU helper routines 3 * 4 * Copyright (c) 2009 Ulrich Hecht 5 * Copyright (c) 2009 Alexander Graf 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * This library 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 GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "qemu/osdep.h" 22 #include "cpu.h" 23 #include "s390x-internal.h" 24 #include "tcg_s390x.h" 25 #include "exec/exec-all.h" 26 #include "exec/cpu_ldst.h" 27 #include "exec/helper-proto.h" 28 #include "fpu/softfloat.h" 29 30 /* #define DEBUG_HELPER */ 31 #ifdef DEBUG_HELPER 32 #define HELPER_LOG(x...) qemu_log(x) 33 #else 34 #define HELPER_LOG(x...) 35 #endif 36 37 static inline Int128 RET128(float128 f) 38 { 39 return int128_make128(f.low, f.high); 40 } 41 42 static inline float128 ARG128(Int128 i) 43 { 44 return make_float128(int128_gethi(i), int128_getlo(i)); 45 } 46 47 uint8_t s390_softfloat_exc_to_ieee(unsigned int exc) 48 { 49 uint8_t s390_exc = 0; 50 51 s390_exc |= (exc & float_flag_invalid) ? S390_IEEE_MASK_INVALID : 0; 52 s390_exc |= (exc & float_flag_divbyzero) ? S390_IEEE_MASK_DIVBYZERO : 0; 53 s390_exc |= (exc & float_flag_overflow) ? S390_IEEE_MASK_OVERFLOW : 0; 54 s390_exc |= (exc & float_flag_underflow) ? S390_IEEE_MASK_UNDERFLOW : 0; 55 s390_exc |= (exc & (float_flag_inexact | float_flag_invalid_cvti)) ? 56 S390_IEEE_MASK_INEXACT : 0; 57 58 return s390_exc; 59 } 60 61 /* Should be called after any operation that may raise IEEE exceptions. */ 62 static void handle_exceptions(CPUS390XState *env, bool XxC, uintptr_t retaddr) 63 { 64 unsigned s390_exc, qemu_exc; 65 66 /* Get the exceptions raised by the current operation. Reset the 67 fpu_status contents so that the next operation has a clean slate. */ 68 qemu_exc = env->fpu_status.float_exception_flags; 69 if (qemu_exc == 0) { 70 return; 71 } 72 env->fpu_status.float_exception_flags = 0; 73 s390_exc = s390_softfloat_exc_to_ieee(qemu_exc); 74 75 /* 76 * IEEE-Underflow exception recognition exists if a tininess condition 77 * (underflow) exists and 78 * - The mask bit in the FPC is zero and the result is inexact 79 * - The mask bit in the FPC is one 80 * So tininess conditions that are not inexact don't trigger any 81 * underflow action in case the mask bit is not one. 82 */ 83 if (!(s390_exc & S390_IEEE_MASK_INEXACT) && 84 !((env->fpc >> 24) & S390_IEEE_MASK_UNDERFLOW)) { 85 s390_exc &= ~S390_IEEE_MASK_UNDERFLOW; 86 } 87 88 /* 89 * FIXME: 90 * 1. Right now, all inexact conditions are indicated as 91 * "truncated" (0) and never as "incremented" (1) in the DXC. 92 * 2. Only traps due to invalid/divbyzero are suppressing. Other traps 93 * are completing, meaning the target register has to be written! 94 * This, however will mean that we have to write the register before 95 * triggering the trap - impossible right now. 96 */ 97 98 /* 99 * invalid/divbyzero cannot coexist with other conditions. 100 * overflow/underflow however can coexist with inexact, we have to 101 * handle it separately. 102 */ 103 if (s390_exc & ~S390_IEEE_MASK_INEXACT) { 104 if (s390_exc & ~S390_IEEE_MASK_INEXACT & env->fpc >> 24) { 105 /* trap condition - inexact reported along */ 106 tcg_s390_data_exception(env, s390_exc, retaddr); 107 } 108 /* nontrap condition - inexact handled differently */ 109 env->fpc |= (s390_exc & ~S390_IEEE_MASK_INEXACT) << 16; 110 } 111 112 /* inexact handling */ 113 if (s390_exc & S390_IEEE_MASK_INEXACT && !XxC) { 114 /* trap condition - overflow/underflow _not_ reported along */ 115 if (s390_exc & S390_IEEE_MASK_INEXACT & env->fpc >> 24) { 116 tcg_s390_data_exception(env, s390_exc & S390_IEEE_MASK_INEXACT, 117 retaddr); 118 } 119 /* nontrap condition */ 120 env->fpc |= (s390_exc & S390_IEEE_MASK_INEXACT) << 16; 121 } 122 } 123 124 int float_comp_to_cc(CPUS390XState *env, FloatRelation float_compare) 125 { 126 switch (float_compare) { 127 case float_relation_equal: 128 return 0; 129 case float_relation_less: 130 return 1; 131 case float_relation_greater: 132 return 2; 133 case float_relation_unordered: 134 return 3; 135 default: 136 cpu_abort(env_cpu(env), "unknown return value for float compare\n"); 137 } 138 } 139 140 /* condition codes for unary FP ops */ 141 uint32_t set_cc_nz_f32(float32 v) 142 { 143 if (float32_is_any_nan(v)) { 144 return 3; 145 } else if (float32_is_zero(v)) { 146 return 0; 147 } else if (float32_is_neg(v)) { 148 return 1; 149 } else { 150 return 2; 151 } 152 } 153 154 uint32_t set_cc_nz_f64(float64 v) 155 { 156 if (float64_is_any_nan(v)) { 157 return 3; 158 } else if (float64_is_zero(v)) { 159 return 0; 160 } else if (float64_is_neg(v)) { 161 return 1; 162 } else { 163 return 2; 164 } 165 } 166 167 uint32_t set_cc_nz_f128(float128 v) 168 { 169 if (float128_is_any_nan(v)) { 170 return 3; 171 } else if (float128_is_zero(v)) { 172 return 0; 173 } else if (float128_is_neg(v)) { 174 return 1; 175 } else { 176 return 2; 177 } 178 } 179 180 /* condition codes for FP to integer conversion ops */ 181 static uint32_t set_cc_conv_f32(float32 v, float_status *stat) 182 { 183 if (stat->float_exception_flags & float_flag_invalid) { 184 return 3; 185 } else { 186 return set_cc_nz_f32(v); 187 } 188 } 189 190 static uint32_t set_cc_conv_f64(float64 v, float_status *stat) 191 { 192 if (stat->float_exception_flags & float_flag_invalid) { 193 return 3; 194 } else { 195 return set_cc_nz_f64(v); 196 } 197 } 198 199 static uint32_t set_cc_conv_f128(float128 v, float_status *stat) 200 { 201 if (stat->float_exception_flags & float_flag_invalid) { 202 return 3; 203 } else { 204 return set_cc_nz_f128(v); 205 } 206 } 207 208 static inline uint8_t round_from_m34(uint32_t m34) 209 { 210 return extract32(m34, 0, 4); 211 } 212 213 static inline bool xxc_from_m34(uint32_t m34) 214 { 215 /* XxC is bit 1 of m4 */ 216 return extract32(m34, 4 + 3 - 1, 1); 217 } 218 219 /* 32-bit FP addition */ 220 uint64_t HELPER(aeb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 221 { 222 float32 ret = float32_add(f1, f2, &env->fpu_status); 223 handle_exceptions(env, false, GETPC()); 224 return ret; 225 } 226 227 /* 64-bit FP addition */ 228 uint64_t HELPER(adb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 229 { 230 float64 ret = float64_add(f1, f2, &env->fpu_status); 231 handle_exceptions(env, false, GETPC()); 232 return ret; 233 } 234 235 /* 128-bit FP addition */ 236 Int128 HELPER(axb)(CPUS390XState *env, Int128 a, Int128 b) 237 { 238 float128 ret = float128_add(ARG128(a), ARG128(b), &env->fpu_status); 239 handle_exceptions(env, false, GETPC()); 240 return RET128(ret); 241 } 242 243 /* 32-bit FP subtraction */ 244 uint64_t HELPER(seb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 245 { 246 float32 ret = float32_sub(f1, f2, &env->fpu_status); 247 handle_exceptions(env, false, GETPC()); 248 return ret; 249 } 250 251 /* 64-bit FP subtraction */ 252 uint64_t HELPER(sdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 253 { 254 float64 ret = float64_sub(f1, f2, &env->fpu_status); 255 handle_exceptions(env, false, GETPC()); 256 return ret; 257 } 258 259 /* 128-bit FP subtraction */ 260 Int128 HELPER(sxb)(CPUS390XState *env, Int128 a, Int128 b) 261 { 262 float128 ret = float128_sub(ARG128(a), ARG128(b), &env->fpu_status); 263 handle_exceptions(env, false, GETPC()); 264 return RET128(ret); 265 } 266 267 /* 32-bit FP division */ 268 uint64_t HELPER(deb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 269 { 270 float32 ret = float32_div(f1, f2, &env->fpu_status); 271 handle_exceptions(env, false, GETPC()); 272 return ret; 273 } 274 275 /* 64-bit FP division */ 276 uint64_t HELPER(ddb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 277 { 278 float64 ret = float64_div(f1, f2, &env->fpu_status); 279 handle_exceptions(env, false, GETPC()); 280 return ret; 281 } 282 283 /* 128-bit FP division */ 284 Int128 HELPER(dxb)(CPUS390XState *env, Int128 a, Int128 b) 285 { 286 float128 ret = float128_div(ARG128(a), ARG128(b), &env->fpu_status); 287 handle_exceptions(env, false, GETPC()); 288 return RET128(ret); 289 } 290 291 /* 32-bit FP multiplication */ 292 uint64_t HELPER(meeb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 293 { 294 float32 ret = float32_mul(f1, f2, &env->fpu_status); 295 handle_exceptions(env, false, GETPC()); 296 return ret; 297 } 298 299 /* 64-bit FP multiplication */ 300 uint64_t HELPER(mdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 301 { 302 float64 ret = float64_mul(f1, f2, &env->fpu_status); 303 handle_exceptions(env, false, GETPC()); 304 return ret; 305 } 306 307 /* 64/32-bit FP multiplication */ 308 uint64_t HELPER(mdeb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 309 { 310 float64 f1_64 = float32_to_float64(f1, &env->fpu_status); 311 float64 ret = float32_to_float64(f2, &env->fpu_status); 312 ret = float64_mul(f1_64, ret, &env->fpu_status); 313 handle_exceptions(env, false, GETPC()); 314 return ret; 315 } 316 317 /* 128-bit FP multiplication */ 318 Int128 HELPER(mxb)(CPUS390XState *env, Int128 a, Int128 b) 319 { 320 float128 ret = float128_mul(ARG128(a), ARG128(b), &env->fpu_status); 321 handle_exceptions(env, false, GETPC()); 322 return RET128(ret); 323 } 324 325 /* 128/64-bit FP multiplication */ 326 Int128 HELPER(mxdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 327 { 328 float128 f1_128 = float64_to_float128(f1, &env->fpu_status); 329 float128 ret = float64_to_float128(f2, &env->fpu_status); 330 ret = float128_mul(f1_128, ret, &env->fpu_status); 331 handle_exceptions(env, false, GETPC()); 332 return RET128(ret); 333 } 334 335 /* convert 32-bit float to 64-bit float */ 336 uint64_t HELPER(ldeb)(CPUS390XState *env, uint64_t f2) 337 { 338 float64 ret = float32_to_float64(f2, &env->fpu_status); 339 handle_exceptions(env, false, GETPC()); 340 return ret; 341 } 342 343 /* convert 128-bit float to 64-bit float */ 344 uint64_t HELPER(ldxb)(CPUS390XState *env, Int128 a, uint32_t m34) 345 { 346 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 347 float64 ret = float128_to_float64(ARG128(a), &env->fpu_status); 348 349 s390_restore_bfp_rounding_mode(env, old_mode); 350 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 351 return ret; 352 } 353 354 /* convert 64-bit float to 128-bit float */ 355 Int128 HELPER(lxdb)(CPUS390XState *env, uint64_t f2) 356 { 357 float128 ret = float64_to_float128(f2, &env->fpu_status); 358 handle_exceptions(env, false, GETPC()); 359 return RET128(ret); 360 } 361 362 /* convert 32-bit float to 128-bit float */ 363 Int128 HELPER(lxeb)(CPUS390XState *env, uint64_t f2) 364 { 365 float128 ret = float32_to_float128(f2, &env->fpu_status); 366 handle_exceptions(env, false, GETPC()); 367 return RET128(ret); 368 } 369 370 /* convert 64-bit float to 32-bit float */ 371 uint64_t HELPER(ledb)(CPUS390XState *env, uint64_t f2, uint32_t m34) 372 { 373 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 374 float32 ret = float64_to_float32(f2, &env->fpu_status); 375 376 s390_restore_bfp_rounding_mode(env, old_mode); 377 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 378 return ret; 379 } 380 381 /* convert 128-bit float to 32-bit float */ 382 uint64_t HELPER(lexb)(CPUS390XState *env, Int128 a, uint32_t m34) 383 { 384 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 385 float32 ret = float128_to_float32(ARG128(a), &env->fpu_status); 386 387 s390_restore_bfp_rounding_mode(env, old_mode); 388 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 389 return ret; 390 } 391 392 /* 32-bit FP compare */ 393 uint32_t HELPER(ceb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 394 { 395 FloatRelation cmp = float32_compare_quiet(f1, f2, &env->fpu_status); 396 handle_exceptions(env, false, GETPC()); 397 return float_comp_to_cc(env, cmp); 398 } 399 400 /* 64-bit FP compare */ 401 uint32_t HELPER(cdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 402 { 403 FloatRelation cmp = float64_compare_quiet(f1, f2, &env->fpu_status); 404 handle_exceptions(env, false, GETPC()); 405 return float_comp_to_cc(env, cmp); 406 } 407 408 /* 128-bit FP compare */ 409 uint32_t HELPER(cxb)(CPUS390XState *env, Int128 a, Int128 b) 410 { 411 FloatRelation cmp = float128_compare_quiet(ARG128(a), ARG128(b), 412 &env->fpu_status); 413 handle_exceptions(env, false, GETPC()); 414 return float_comp_to_cc(env, cmp); 415 } 416 417 int s390_swap_bfp_rounding_mode(CPUS390XState *env, int m3) 418 { 419 int ret = env->fpu_status.float_rounding_mode; 420 421 switch (m3) { 422 case 0: 423 /* current mode */ 424 break; 425 case 1: 426 /* round to nearest with ties away from 0 */ 427 set_float_rounding_mode(float_round_ties_away, &env->fpu_status); 428 break; 429 case 3: 430 /* round to prepare for shorter precision */ 431 set_float_rounding_mode(float_round_to_odd, &env->fpu_status); 432 break; 433 case 4: 434 /* round to nearest with ties to even */ 435 set_float_rounding_mode(float_round_nearest_even, &env->fpu_status); 436 break; 437 case 5: 438 /* round to zero */ 439 set_float_rounding_mode(float_round_to_zero, &env->fpu_status); 440 break; 441 case 6: 442 /* round to +inf */ 443 set_float_rounding_mode(float_round_up, &env->fpu_status); 444 break; 445 case 7: 446 /* round to -inf */ 447 set_float_rounding_mode(float_round_down, &env->fpu_status); 448 break; 449 default: 450 g_assert_not_reached(); 451 } 452 return ret; 453 } 454 455 void s390_restore_bfp_rounding_mode(CPUS390XState *env, int old_mode) 456 { 457 set_float_rounding_mode(old_mode, &env->fpu_status); 458 } 459 460 /* convert 64-bit int to 32-bit float */ 461 uint64_t HELPER(cegb)(CPUS390XState *env, int64_t v2, uint32_t m34) 462 { 463 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 464 float32 ret = int64_to_float32(v2, &env->fpu_status); 465 466 s390_restore_bfp_rounding_mode(env, old_mode); 467 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 468 return ret; 469 } 470 471 /* convert 64-bit int to 64-bit float */ 472 uint64_t HELPER(cdgb)(CPUS390XState *env, int64_t v2, uint32_t m34) 473 { 474 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 475 float64 ret = int64_to_float64(v2, &env->fpu_status); 476 477 s390_restore_bfp_rounding_mode(env, old_mode); 478 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 479 return ret; 480 } 481 482 /* convert 64-bit int to 128-bit float */ 483 Int128 HELPER(cxgb)(CPUS390XState *env, int64_t v2, uint32_t m34) 484 { 485 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 486 float128 ret = int64_to_float128(v2, &env->fpu_status); 487 488 s390_restore_bfp_rounding_mode(env, old_mode); 489 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 490 return RET128(ret); 491 } 492 493 /* convert 64-bit uint to 32-bit float */ 494 uint64_t HELPER(celgb)(CPUS390XState *env, uint64_t v2, uint32_t m34) 495 { 496 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 497 float32 ret = uint64_to_float32(v2, &env->fpu_status); 498 499 s390_restore_bfp_rounding_mode(env, old_mode); 500 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 501 return ret; 502 } 503 504 /* convert 64-bit uint to 64-bit float */ 505 uint64_t HELPER(cdlgb)(CPUS390XState *env, uint64_t v2, uint32_t m34) 506 { 507 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 508 float64 ret = uint64_to_float64(v2, &env->fpu_status); 509 510 s390_restore_bfp_rounding_mode(env, old_mode); 511 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 512 return ret; 513 } 514 515 /* convert 64-bit uint to 128-bit float */ 516 Int128 HELPER(cxlgb)(CPUS390XState *env, uint64_t v2, uint32_t m34) 517 { 518 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 519 float128 ret = uint64_to_float128(v2, &env->fpu_status); 520 521 s390_restore_bfp_rounding_mode(env, old_mode); 522 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 523 return RET128(ret); 524 } 525 526 /* convert 32-bit float to 64-bit int */ 527 uint64_t HELPER(cgeb)(CPUS390XState *env, uint64_t v2, uint32_t m34) 528 { 529 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 530 int64_t ret = float32_to_int64(v2, &env->fpu_status); 531 uint32_t cc = set_cc_conv_f32(v2, &env->fpu_status); 532 533 s390_restore_bfp_rounding_mode(env, old_mode); 534 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 535 env->cc_op = cc; 536 if (float32_is_any_nan(v2)) { 537 return INT64_MIN; 538 } 539 return ret; 540 } 541 542 /* convert 64-bit float to 64-bit int */ 543 uint64_t HELPER(cgdb)(CPUS390XState *env, uint64_t v2, uint32_t m34) 544 { 545 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 546 int64_t ret = float64_to_int64(v2, &env->fpu_status); 547 uint32_t cc = set_cc_conv_f64(v2, &env->fpu_status); 548 549 s390_restore_bfp_rounding_mode(env, old_mode); 550 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 551 env->cc_op = cc; 552 if (float64_is_any_nan(v2)) { 553 return INT64_MIN; 554 } 555 return ret; 556 } 557 558 /* convert 128-bit float to 64-bit int */ 559 uint64_t HELPER(cgxb)(CPUS390XState *env, Int128 i2, uint32_t m34) 560 { 561 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 562 float128 v2 = ARG128(i2); 563 int64_t ret = float128_to_int64(v2, &env->fpu_status); 564 uint32_t cc = set_cc_conv_f128(v2, &env->fpu_status); 565 566 s390_restore_bfp_rounding_mode(env, old_mode); 567 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 568 env->cc_op = cc; 569 if (float128_is_any_nan(v2)) { 570 return INT64_MIN; 571 } 572 return ret; 573 } 574 575 /* convert 32-bit float to 32-bit int */ 576 uint64_t HELPER(cfeb)(CPUS390XState *env, uint64_t v2, uint32_t m34) 577 { 578 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 579 int32_t ret = float32_to_int32(v2, &env->fpu_status); 580 uint32_t cc = set_cc_conv_f32(v2, &env->fpu_status); 581 582 s390_restore_bfp_rounding_mode(env, old_mode); 583 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 584 env->cc_op = cc; 585 if (float32_is_any_nan(v2)) { 586 return INT32_MIN; 587 } 588 return ret; 589 } 590 591 /* convert 64-bit float to 32-bit int */ 592 uint64_t HELPER(cfdb)(CPUS390XState *env, uint64_t v2, uint32_t m34) 593 { 594 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 595 int32_t ret = float64_to_int32(v2, &env->fpu_status); 596 uint32_t cc = set_cc_conv_f64(v2, &env->fpu_status); 597 598 s390_restore_bfp_rounding_mode(env, old_mode); 599 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 600 env->cc_op = cc; 601 if (float64_is_any_nan(v2)) { 602 return INT32_MIN; 603 } 604 return ret; 605 } 606 607 /* convert 128-bit float to 32-bit int */ 608 uint64_t HELPER(cfxb)(CPUS390XState *env, Int128 i2, uint32_t m34) 609 { 610 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 611 float128 v2 = ARG128(i2); 612 int32_t ret = float128_to_int32(v2, &env->fpu_status); 613 uint32_t cc = set_cc_conv_f128(v2, &env->fpu_status); 614 615 s390_restore_bfp_rounding_mode(env, old_mode); 616 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 617 env->cc_op = cc; 618 if (float128_is_any_nan(v2)) { 619 return INT32_MIN; 620 } 621 return ret; 622 } 623 624 /* convert 32-bit float to 64-bit uint */ 625 uint64_t HELPER(clgeb)(CPUS390XState *env, uint64_t v2, uint32_t m34) 626 { 627 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 628 uint64_t ret = float32_to_uint64(v2, &env->fpu_status); 629 uint32_t cc = set_cc_conv_f32(v2, &env->fpu_status); 630 631 s390_restore_bfp_rounding_mode(env, old_mode); 632 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 633 env->cc_op = cc; 634 if (float32_is_any_nan(v2)) { 635 return 0; 636 } 637 return ret; 638 } 639 640 /* convert 64-bit float to 64-bit uint */ 641 uint64_t HELPER(clgdb)(CPUS390XState *env, uint64_t v2, uint32_t m34) 642 { 643 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 644 uint64_t ret = float64_to_uint64(v2, &env->fpu_status); 645 uint32_t cc = set_cc_conv_f64(v2, &env->fpu_status); 646 647 s390_restore_bfp_rounding_mode(env, old_mode); 648 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 649 env->cc_op = cc; 650 if (float64_is_any_nan(v2)) { 651 return 0; 652 } 653 return ret; 654 } 655 656 /* convert 128-bit float to 64-bit uint */ 657 uint64_t HELPER(clgxb)(CPUS390XState *env, Int128 i2, uint32_t m34) 658 { 659 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 660 float128 v2 = ARG128(i2); 661 uint64_t ret = float128_to_uint64(v2, &env->fpu_status); 662 uint32_t cc = set_cc_conv_f128(v2, &env->fpu_status); 663 664 s390_restore_bfp_rounding_mode(env, old_mode); 665 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 666 env->cc_op = cc; 667 if (float128_is_any_nan(v2)) { 668 return 0; 669 } 670 return ret; 671 } 672 673 /* convert 32-bit float to 32-bit uint */ 674 uint64_t HELPER(clfeb)(CPUS390XState *env, uint64_t v2, uint32_t m34) 675 { 676 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 677 uint32_t ret = float32_to_uint32(v2, &env->fpu_status); 678 uint32_t cc = set_cc_conv_f32(v2, &env->fpu_status); 679 680 s390_restore_bfp_rounding_mode(env, old_mode); 681 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 682 env->cc_op = cc; 683 if (float32_is_any_nan(v2)) { 684 return 0; 685 } 686 return ret; 687 } 688 689 /* convert 64-bit float to 32-bit uint */ 690 uint64_t HELPER(clfdb)(CPUS390XState *env, uint64_t v2, uint32_t m34) 691 { 692 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 693 uint32_t ret = float64_to_uint32(v2, &env->fpu_status); 694 uint32_t cc = set_cc_conv_f64(v2, &env->fpu_status); 695 696 s390_restore_bfp_rounding_mode(env, old_mode); 697 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 698 env->cc_op = cc; 699 if (float64_is_any_nan(v2)) { 700 return 0; 701 } 702 return ret; 703 } 704 705 /* convert 128-bit float to 32-bit uint */ 706 uint64_t HELPER(clfxb)(CPUS390XState *env, Int128 i2, uint32_t m34) 707 { 708 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 709 float128 v2 = ARG128(i2); 710 uint32_t ret = float128_to_uint32(v2, &env->fpu_status); 711 uint32_t cc = set_cc_conv_f128(v2, &env->fpu_status); 712 713 s390_restore_bfp_rounding_mode(env, old_mode); 714 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 715 env->cc_op = cc; 716 if (float128_is_any_nan(v2)) { 717 return 0; 718 } 719 return ret; 720 } 721 722 /* round to integer 32-bit */ 723 uint64_t HELPER(fieb)(CPUS390XState *env, uint64_t f2, uint32_t m34) 724 { 725 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 726 float32 ret = float32_round_to_int(f2, &env->fpu_status); 727 728 s390_restore_bfp_rounding_mode(env, old_mode); 729 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 730 return ret; 731 } 732 733 /* round to integer 64-bit */ 734 uint64_t HELPER(fidb)(CPUS390XState *env, uint64_t f2, uint32_t m34) 735 { 736 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 737 float64 ret = float64_round_to_int(f2, &env->fpu_status); 738 739 s390_restore_bfp_rounding_mode(env, old_mode); 740 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 741 return ret; 742 } 743 744 /* round to integer 128-bit */ 745 Int128 HELPER(fixb)(CPUS390XState *env, Int128 a, uint32_t m34) 746 { 747 int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); 748 float128 ret = float128_round_to_int(ARG128(a), &env->fpu_status); 749 750 s390_restore_bfp_rounding_mode(env, old_mode); 751 handle_exceptions(env, xxc_from_m34(m34), GETPC()); 752 return RET128(ret); 753 } 754 755 /* 32-bit FP compare and signal */ 756 uint32_t HELPER(keb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 757 { 758 FloatRelation cmp = float32_compare(f1, f2, &env->fpu_status); 759 handle_exceptions(env, false, GETPC()); 760 return float_comp_to_cc(env, cmp); 761 } 762 763 /* 64-bit FP compare and signal */ 764 uint32_t HELPER(kdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) 765 { 766 FloatRelation cmp = float64_compare(f1, f2, &env->fpu_status); 767 handle_exceptions(env, false, GETPC()); 768 return float_comp_to_cc(env, cmp); 769 } 770 771 /* 128-bit FP compare and signal */ 772 uint32_t HELPER(kxb)(CPUS390XState *env, Int128 a, Int128 b) 773 { 774 FloatRelation cmp = float128_compare(ARG128(a), ARG128(b), 775 &env->fpu_status); 776 handle_exceptions(env, false, GETPC()); 777 return float_comp_to_cc(env, cmp); 778 } 779 780 /* 32-bit FP multiply and add */ 781 uint64_t HELPER(maeb)(CPUS390XState *env, uint64_t f1, 782 uint64_t f2, uint64_t f3) 783 { 784 float32 ret = float32_muladd(f2, f3, f1, 0, &env->fpu_status); 785 handle_exceptions(env, false, GETPC()); 786 return ret; 787 } 788 789 /* 64-bit FP multiply and add */ 790 uint64_t HELPER(madb)(CPUS390XState *env, uint64_t f1, 791 uint64_t f2, uint64_t f3) 792 { 793 float64 ret = float64_muladd(f2, f3, f1, 0, &env->fpu_status); 794 handle_exceptions(env, false, GETPC()); 795 return ret; 796 } 797 798 /* 32-bit FP multiply and subtract */ 799 uint64_t HELPER(mseb)(CPUS390XState *env, uint64_t f1, 800 uint64_t f2, uint64_t f3) 801 { 802 float32 ret = float32_muladd(f2, f3, f1, float_muladd_negate_c, 803 &env->fpu_status); 804 handle_exceptions(env, false, GETPC()); 805 return ret; 806 } 807 808 /* 64-bit FP multiply and subtract */ 809 uint64_t HELPER(msdb)(CPUS390XState *env, uint64_t f1, 810 uint64_t f2, uint64_t f3) 811 { 812 float64 ret = float64_muladd(f2, f3, f1, float_muladd_negate_c, 813 &env->fpu_status); 814 handle_exceptions(env, false, GETPC()); 815 return ret; 816 } 817 818 /* The rightmost bit has the number 11. */ 819 static inline uint16_t dcmask(int bit, bool neg) 820 { 821 return 1 << (11 - bit - neg); 822 } 823 824 #define DEF_FLOAT_DCMASK(_TYPE) \ 825 uint16_t _TYPE##_dcmask(CPUS390XState *env, _TYPE f1) \ 826 { \ 827 const bool neg = _TYPE##_is_neg(f1); \ 828 \ 829 /* Sorted by most common cases - only one class is possible */ \ 830 if (_TYPE##_is_normal(f1)) { \ 831 return dcmask(2, neg); \ 832 } else if (_TYPE##_is_zero(f1)) { \ 833 return dcmask(0, neg); \ 834 } else if (_TYPE##_is_denormal(f1)) { \ 835 return dcmask(4, neg); \ 836 } else if (_TYPE##_is_infinity(f1)) { \ 837 return dcmask(6, neg); \ 838 } else if (_TYPE##_is_quiet_nan(f1, &env->fpu_status)) { \ 839 return dcmask(8, neg); \ 840 } \ 841 /* signaling nan, as last remaining case */ \ 842 return dcmask(10, neg); \ 843 } 844 DEF_FLOAT_DCMASK(float32) 845 DEF_FLOAT_DCMASK(float64) 846 DEF_FLOAT_DCMASK(float128) 847 848 /* test data class 32-bit */ 849 uint32_t HELPER(tceb)(CPUS390XState *env, uint64_t f1, uint64_t m2) 850 { 851 return (m2 & float32_dcmask(env, f1)) != 0; 852 } 853 854 /* test data class 64-bit */ 855 uint32_t HELPER(tcdb)(CPUS390XState *env, uint64_t v1, uint64_t m2) 856 { 857 return (m2 & float64_dcmask(env, v1)) != 0; 858 } 859 860 /* test data class 128-bit */ 861 uint32_t HELPER(tcxb)(CPUS390XState *env, Int128 a, uint64_t m2) 862 { 863 return (m2 & float128_dcmask(env, ARG128(a))) != 0; 864 } 865 866 /* square root 32-bit */ 867 uint64_t HELPER(sqeb)(CPUS390XState *env, uint64_t f2) 868 { 869 float32 ret = float32_sqrt(f2, &env->fpu_status); 870 handle_exceptions(env, false, GETPC()); 871 return ret; 872 } 873 874 /* square root 64-bit */ 875 uint64_t HELPER(sqdb)(CPUS390XState *env, uint64_t f2) 876 { 877 float64 ret = float64_sqrt(f2, &env->fpu_status); 878 handle_exceptions(env, false, GETPC()); 879 return ret; 880 } 881 882 /* square root 128-bit */ 883 Int128 HELPER(sqxb)(CPUS390XState *env, Int128 a) 884 { 885 float128 ret = float128_sqrt(ARG128(a), &env->fpu_status); 886 handle_exceptions(env, false, GETPC()); 887 return RET128(ret); 888 } 889 890 static const int fpc_to_rnd[8] = { 891 float_round_nearest_even, 892 float_round_to_zero, 893 float_round_up, 894 float_round_down, 895 -1, 896 -1, 897 -1, 898 float_round_to_odd, 899 }; 900 901 /* set fpc */ 902 void HELPER(sfpc)(CPUS390XState *env, uint64_t fpc) 903 { 904 if (fpc_to_rnd[fpc & 0x7] == -1 || fpc & 0x03030088u || 905 (!s390_has_feat(S390_FEAT_FLOATING_POINT_EXT) && fpc & 0x4)) { 906 tcg_s390_program_interrupt(env, PGM_SPECIFICATION, GETPC()); 907 } 908 909 /* Install everything in the main FPC. */ 910 env->fpc = fpc; 911 912 /* Install the rounding mode in the shadow fpu_status. */ 913 set_float_rounding_mode(fpc_to_rnd[fpc & 0x7], &env->fpu_status); 914 } 915 916 /* set fpc and signal */ 917 void HELPER(sfas)(CPUS390XState *env, uint64_t fpc) 918 { 919 uint32_t signalling = env->fpc; 920 uint32_t s390_exc; 921 922 if (fpc_to_rnd[fpc & 0x7] == -1 || fpc & 0x03030088u || 923 (!s390_has_feat(S390_FEAT_FLOATING_POINT_EXT) && fpc & 0x4)) { 924 tcg_s390_program_interrupt(env, PGM_SPECIFICATION, GETPC()); 925 } 926 927 /* 928 * FPC is set to the FPC operand with a bitwise OR of the signalling 929 * flags. 930 */ 931 env->fpc = fpc | (signalling & 0x00ff0000); 932 set_float_rounding_mode(fpc_to_rnd[fpc & 0x7], &env->fpu_status); 933 934 /* 935 * If any signaling flag is enabled in the new FPC mask, a 936 * simulated-iee-exception exception occurs. 937 */ 938 s390_exc = (signalling >> 16) & (fpc >> 24); 939 if (s390_exc) { 940 if (s390_exc & S390_IEEE_MASK_INVALID) { 941 s390_exc = S390_IEEE_MASK_INVALID; 942 } else if (s390_exc & S390_IEEE_MASK_DIVBYZERO) { 943 s390_exc = S390_IEEE_MASK_DIVBYZERO; 944 } else if (s390_exc & S390_IEEE_MASK_OVERFLOW) { 945 s390_exc &= (S390_IEEE_MASK_OVERFLOW | S390_IEEE_MASK_INEXACT); 946 } else if (s390_exc & S390_IEEE_MASK_UNDERFLOW) { 947 s390_exc &= (S390_IEEE_MASK_UNDERFLOW | S390_IEEE_MASK_INEXACT); 948 } else if (s390_exc & S390_IEEE_MASK_INEXACT) { 949 s390_exc = S390_IEEE_MASK_INEXACT; 950 } else if (s390_exc & S390_IEEE_MASK_QUANTUM) { 951 s390_exc = S390_IEEE_MASK_QUANTUM; 952 } 953 tcg_s390_data_exception(env, s390_exc | 3, GETPC()); 954 } 955 } 956 957 /* set bfp rounding mode */ 958 void HELPER(srnm)(CPUS390XState *env, uint64_t rnd) 959 { 960 if (rnd > 0x7 || fpc_to_rnd[rnd & 0x7] == -1) { 961 tcg_s390_program_interrupt(env, PGM_SPECIFICATION, GETPC()); 962 } 963 964 env->fpc = deposit32(env->fpc, 0, 3, rnd); 965 set_float_rounding_mode(fpc_to_rnd[rnd & 0x7], &env->fpu_status); 966 } 967