1 /* 2 * QEMU TCG support -- s390x vector floating point instruction support 3 * 4 * Copyright (C) 2019 Red Hat Inc 5 * 6 * Authors: 7 * David Hildenbrand <david@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or later. 10 * See the COPYING file in the top-level directory. 11 */ 12 #include "qemu/osdep.h" 13 #include "qemu-common.h" 14 #include "cpu.h" 15 #include "internal.h" 16 #include "vec.h" 17 #include "tcg_s390x.h" 18 #include "tcg/tcg-gvec-desc.h" 19 #include "exec/exec-all.h" 20 #include "exec/helper-proto.h" 21 #include "fpu/softfloat.h" 22 23 #define VIC_INVALID 0x1 24 #define VIC_DIVBYZERO 0x2 25 #define VIC_OVERFLOW 0x3 26 #define VIC_UNDERFLOW 0x4 27 #define VIC_INEXACT 0x5 28 29 /* returns the VEX. If the VEX is 0, there is no trap */ 30 static uint8_t check_ieee_exc(CPUS390XState *env, uint8_t enr, bool XxC, 31 uint8_t *vec_exc) 32 { 33 uint8_t vece_exc = 0, trap_exc; 34 unsigned qemu_exc; 35 36 /* Retrieve and clear the softfloat exceptions */ 37 qemu_exc = env->fpu_status.float_exception_flags; 38 if (qemu_exc == 0) { 39 return 0; 40 } 41 env->fpu_status.float_exception_flags = 0; 42 43 vece_exc = s390_softfloat_exc_to_ieee(qemu_exc); 44 45 /* Add them to the vector-wide s390x exception bits */ 46 *vec_exc |= vece_exc; 47 48 /* Check for traps and construct the VXC */ 49 trap_exc = vece_exc & env->fpc >> 24; 50 if (trap_exc) { 51 if (trap_exc & S390_IEEE_MASK_INVALID) { 52 return enr << 4 | VIC_INVALID; 53 } else if (trap_exc & S390_IEEE_MASK_DIVBYZERO) { 54 return enr << 4 | VIC_DIVBYZERO; 55 } else if (trap_exc & S390_IEEE_MASK_OVERFLOW) { 56 return enr << 4 | VIC_OVERFLOW; 57 } else if (trap_exc & S390_IEEE_MASK_UNDERFLOW) { 58 return enr << 4 | VIC_UNDERFLOW; 59 } else if (!XxC) { 60 g_assert(trap_exc & S390_IEEE_MASK_INEXACT); 61 /* inexact has lowest priority on traps */ 62 return enr << 4 | VIC_INEXACT; 63 } 64 } 65 return 0; 66 } 67 68 static void handle_ieee_exc(CPUS390XState *env, uint8_t vxc, uint8_t vec_exc, 69 uintptr_t retaddr) 70 { 71 if (vxc) { 72 /* on traps, the fpc flags are not updated, instruction is suppressed */ 73 tcg_s390_vector_exception(env, vxc, retaddr); 74 } 75 if (vec_exc) { 76 /* indicate exceptions for all elements combined */ 77 env->fpc |= vec_exc << 16; 78 } 79 } 80 81 typedef uint64_t (*vop64_2_fn)(uint64_t a, float_status *s); 82 static void vop64_2(S390Vector *v1, const S390Vector *v2, CPUS390XState *env, 83 bool s, bool XxC, uint8_t erm, vop64_2_fn fn, 84 uintptr_t retaddr) 85 { 86 uint8_t vxc, vec_exc = 0; 87 S390Vector tmp = {}; 88 int i, old_mode; 89 90 old_mode = s390_swap_bfp_rounding_mode(env, erm); 91 for (i = 0; i < 2; i++) { 92 const uint64_t a = s390_vec_read_element64(v2, i); 93 94 s390_vec_write_element64(&tmp, i, fn(a, &env->fpu_status)); 95 vxc = check_ieee_exc(env, i, XxC, &vec_exc); 96 if (s || vxc) { 97 break; 98 } 99 } 100 s390_restore_bfp_rounding_mode(env, old_mode); 101 handle_ieee_exc(env, vxc, vec_exc, retaddr); 102 *v1 = tmp; 103 } 104 105 typedef uint64_t (*vop64_3_fn)(uint64_t a, uint64_t b, float_status *s); 106 static void vop64_3(S390Vector *v1, const S390Vector *v2, const S390Vector *v3, 107 CPUS390XState *env, bool s, vop64_3_fn fn, 108 uintptr_t retaddr) 109 { 110 uint8_t vxc, vec_exc = 0; 111 S390Vector tmp = {}; 112 int i; 113 114 for (i = 0; i < 2; i++) { 115 const uint64_t a = s390_vec_read_element64(v2, i); 116 const uint64_t b = s390_vec_read_element64(v3, i); 117 118 s390_vec_write_element64(&tmp, i, fn(a, b, &env->fpu_status)); 119 vxc = check_ieee_exc(env, i, false, &vec_exc); 120 if (s || vxc) { 121 break; 122 } 123 } 124 handle_ieee_exc(env, vxc, vec_exc, retaddr); 125 *v1 = tmp; 126 } 127 128 static uint64_t vfa64(uint64_t a, uint64_t b, float_status *s) 129 { 130 return float64_add(a, b, s); 131 } 132 133 void HELPER(gvec_vfa64)(void *v1, const void *v2, const void *v3, 134 CPUS390XState *env, uint32_t desc) 135 { 136 vop64_3(v1, v2, v3, env, false, vfa64, GETPC()); 137 } 138 139 void HELPER(gvec_vfa64s)(void *v1, const void *v2, const void *v3, 140 CPUS390XState *env, uint32_t desc) 141 { 142 vop64_3(v1, v2, v3, env, true, vfa64, GETPC()); 143 } 144 145 static int wfc64(const S390Vector *v1, const S390Vector *v2, 146 CPUS390XState *env, bool signal, uintptr_t retaddr) 147 { 148 /* only the zero-indexed elements are compared */ 149 const float64 a = s390_vec_read_element64(v1, 0); 150 const float64 b = s390_vec_read_element64(v2, 0); 151 uint8_t vxc, vec_exc = 0; 152 int cmp; 153 154 if (signal) { 155 cmp = float64_compare(a, b, &env->fpu_status); 156 } else { 157 cmp = float64_compare_quiet(a, b, &env->fpu_status); 158 } 159 vxc = check_ieee_exc(env, 0, false, &vec_exc); 160 handle_ieee_exc(env, vxc, vec_exc, retaddr); 161 162 return float_comp_to_cc(env, cmp); 163 } 164 165 void HELPER(gvec_wfc64)(const void *v1, const void *v2, CPUS390XState *env, 166 uint32_t desc) 167 { 168 env->cc_op = wfc64(v1, v2, env, false, GETPC()); 169 } 170 171 void HELPER(gvec_wfk64)(const void *v1, const void *v2, CPUS390XState *env, 172 uint32_t desc) 173 { 174 env->cc_op = wfc64(v1, v2, env, true, GETPC()); 175 } 176 177 typedef int (*vfc64_fn)(float64 a, float64 b, float_status *status); 178 static int vfc64(S390Vector *v1, const S390Vector *v2, const S390Vector *v3, 179 CPUS390XState *env, bool s, vfc64_fn fn, uintptr_t retaddr) 180 { 181 uint8_t vxc, vec_exc = 0; 182 S390Vector tmp = {}; 183 int match = 0; 184 int i; 185 186 for (i = 0; i < 2; i++) { 187 const float64 a = s390_vec_read_element64(v2, i); 188 const float64 b = s390_vec_read_element64(v3, i); 189 190 /* swap the order of the parameters, so we can use existing functions */ 191 if (fn(b, a, &env->fpu_status)) { 192 match++; 193 s390_vec_write_element64(&tmp, i, -1ull); 194 } 195 vxc = check_ieee_exc(env, i, false, &vec_exc); 196 if (s || vxc) { 197 break; 198 } 199 } 200 201 handle_ieee_exc(env, vxc, vec_exc, retaddr); 202 *v1 = tmp; 203 if (match) { 204 return s || match == 2 ? 0 : 1; 205 } 206 return 3; 207 } 208 209 void HELPER(gvec_vfce64)(void *v1, const void *v2, const void *v3, 210 CPUS390XState *env, uint32_t desc) 211 { 212 vfc64(v1, v2, v3, env, false, float64_eq_quiet, GETPC()); 213 } 214 215 void HELPER(gvec_vfce64s)(void *v1, const void *v2, const void *v3, 216 CPUS390XState *env, uint32_t desc) 217 { 218 vfc64(v1, v2, v3, env, true, float64_eq_quiet, GETPC()); 219 } 220 221 void HELPER(gvec_vfce64_cc)(void *v1, const void *v2, const void *v3, 222 CPUS390XState *env, uint32_t desc) 223 { 224 env->cc_op = vfc64(v1, v2, v3, env, false, float64_eq_quiet, GETPC()); 225 } 226 227 void HELPER(gvec_vfce64s_cc)(void *v1, const void *v2, const void *v3, 228 CPUS390XState *env, uint32_t desc) 229 { 230 env->cc_op = vfc64(v1, v2, v3, env, true, float64_eq_quiet, GETPC()); 231 } 232 233 void HELPER(gvec_vfch64)(void *v1, const void *v2, const void *v3, 234 CPUS390XState *env, uint32_t desc) 235 { 236 vfc64(v1, v2, v3, env, false, float64_lt_quiet, GETPC()); 237 } 238 239 void HELPER(gvec_vfch64s)(void *v1, const void *v2, const void *v3, 240 CPUS390XState *env, uint32_t desc) 241 { 242 vfc64(v1, v2, v3, env, true, float64_lt_quiet, GETPC()); 243 } 244 245 void HELPER(gvec_vfch64_cc)(void *v1, const void *v2, const void *v3, 246 CPUS390XState *env, uint32_t desc) 247 { 248 env->cc_op = vfc64(v1, v2, v3, env, false, float64_lt_quiet, GETPC()); 249 } 250 251 void HELPER(gvec_vfch64s_cc)(void *v1, const void *v2, const void *v3, 252 CPUS390XState *env, uint32_t desc) 253 { 254 env->cc_op = vfc64(v1, v2, v3, env, true, float64_lt_quiet, GETPC()); 255 } 256 257 void HELPER(gvec_vfche64)(void *v1, const void *v2, const void *v3, 258 CPUS390XState *env, uint32_t desc) 259 { 260 vfc64(v1, v2, v3, env, false, float64_le_quiet, GETPC()); 261 } 262 263 void HELPER(gvec_vfche64s)(void *v1, const void *v2, const void *v3, 264 CPUS390XState *env, uint32_t desc) 265 { 266 vfc64(v1, v2, v3, env, true, float64_le_quiet, GETPC()); 267 } 268 269 void HELPER(gvec_vfche64_cc)(void *v1, const void *v2, const void *v3, 270 CPUS390XState *env, uint32_t desc) 271 { 272 env->cc_op = vfc64(v1, v2, v3, env, false, float64_le_quiet, GETPC()); 273 } 274 275 void HELPER(gvec_vfche64s_cc)(void *v1, const void *v2, const void *v3, 276 CPUS390XState *env, uint32_t desc) 277 { 278 env->cc_op = vfc64(v1, v2, v3, env, true, float64_le_quiet, GETPC()); 279 } 280 281 static uint64_t vcdg64(uint64_t a, float_status *s) 282 { 283 return int64_to_float64(a, s); 284 } 285 286 void HELPER(gvec_vcdg64)(void *v1, const void *v2, CPUS390XState *env, 287 uint32_t desc) 288 { 289 const uint8_t erm = extract32(simd_data(desc), 4, 4); 290 const bool XxC = extract32(simd_data(desc), 2, 1); 291 292 vop64_2(v1, v2, env, false, XxC, erm, vcdg64, GETPC()); 293 } 294 295 void HELPER(gvec_vcdg64s)(void *v1, const void *v2, CPUS390XState *env, 296 uint32_t desc) 297 { 298 const uint8_t erm = extract32(simd_data(desc), 4, 4); 299 const bool XxC = extract32(simd_data(desc), 2, 1); 300 301 vop64_2(v1, v2, env, true, XxC, erm, vcdg64, GETPC()); 302 } 303 304 static uint64_t vcdlg64(uint64_t a, float_status *s) 305 { 306 return uint64_to_float64(a, s); 307 } 308 309 void HELPER(gvec_vcdlg64)(void *v1, const void *v2, CPUS390XState *env, 310 uint32_t desc) 311 { 312 const uint8_t erm = extract32(simd_data(desc), 4, 4); 313 const bool XxC = extract32(simd_data(desc), 2, 1); 314 315 vop64_2(v1, v2, env, false, XxC, erm, vcdlg64, GETPC()); 316 } 317 318 void HELPER(gvec_vcdlg64s)(void *v1, const void *v2, CPUS390XState *env, 319 uint32_t desc) 320 { 321 const uint8_t erm = extract32(simd_data(desc), 4, 4); 322 const bool XxC = extract32(simd_data(desc), 2, 1); 323 324 vop64_2(v1, v2, env, true, XxC, erm, vcdlg64, GETPC()); 325 } 326 327 static uint64_t vcgd64(uint64_t a, float_status *s) 328 { 329 return float64_to_int64(a, s); 330 } 331 332 void HELPER(gvec_vcgd64)(void *v1, const void *v2, CPUS390XState *env, 333 uint32_t desc) 334 { 335 const uint8_t erm = extract32(simd_data(desc), 4, 4); 336 const bool XxC = extract32(simd_data(desc), 2, 1); 337 338 vop64_2(v1, v2, env, false, XxC, erm, vcgd64, GETPC()); 339 } 340 341 void HELPER(gvec_vcgd64s)(void *v1, const void *v2, CPUS390XState *env, 342 uint32_t desc) 343 { 344 const uint8_t erm = extract32(simd_data(desc), 4, 4); 345 const bool XxC = extract32(simd_data(desc), 2, 1); 346 347 vop64_2(v1, v2, env, true, XxC, erm, vcgd64, GETPC()); 348 } 349 350 static uint64_t vclgd64(uint64_t a, float_status *s) 351 { 352 return float64_to_uint64(a, s); 353 } 354 355 void HELPER(gvec_vclgd64)(void *v1, const void *v2, CPUS390XState *env, 356 uint32_t desc) 357 { 358 const uint8_t erm = extract32(simd_data(desc), 4, 4); 359 const bool XxC = extract32(simd_data(desc), 2, 1); 360 361 vop64_2(v1, v2, env, false, XxC, erm, vclgd64, GETPC()); 362 } 363 364 void HELPER(gvec_vclgd64s)(void *v1, const void *v2, CPUS390XState *env, 365 uint32_t desc) 366 { 367 const uint8_t erm = extract32(simd_data(desc), 4, 4); 368 const bool XxC = extract32(simd_data(desc), 2, 1); 369 370 vop64_2(v1, v2, env, true, XxC, erm, vclgd64, GETPC()); 371 } 372 373 static uint64_t vfd64(uint64_t a, uint64_t b, float_status *s) 374 { 375 return float64_div(a, b, s); 376 } 377 378 void HELPER(gvec_vfd64)(void *v1, const void *v2, const void *v3, 379 CPUS390XState *env, uint32_t desc) 380 { 381 vop64_3(v1, v2, v3, env, false, vfd64, GETPC()); 382 } 383 384 void HELPER(gvec_vfd64s)(void *v1, const void *v2, const void *v3, 385 CPUS390XState *env, uint32_t desc) 386 { 387 vop64_3(v1, v2, v3, env, true, vfd64, GETPC()); 388 } 389 390 static uint64_t vfi64(uint64_t a, float_status *s) 391 { 392 return float64_round_to_int(a, s); 393 } 394 395 void HELPER(gvec_vfi64)(void *v1, const void *v2, CPUS390XState *env, 396 uint32_t desc) 397 { 398 const uint8_t erm = extract32(simd_data(desc), 4, 4); 399 const bool XxC = extract32(simd_data(desc), 2, 1); 400 401 vop64_2(v1, v2, env, false, XxC, erm, vfi64, GETPC()); 402 } 403 404 void HELPER(gvec_vfi64s)(void *v1, const void *v2, CPUS390XState *env, 405 uint32_t desc) 406 { 407 const uint8_t erm = extract32(simd_data(desc), 4, 4); 408 const bool XxC = extract32(simd_data(desc), 2, 1); 409 410 vop64_2(v1, v2, env, true, XxC, erm, vfi64, GETPC()); 411 } 412 413 static void vfll32(S390Vector *v1, const S390Vector *v2, CPUS390XState *env, 414 bool s, uintptr_t retaddr) 415 { 416 uint8_t vxc, vec_exc = 0; 417 S390Vector tmp = {}; 418 int i; 419 420 for (i = 0; i < 2; i++) { 421 /* load from even element */ 422 const float32 a = s390_vec_read_element32(v2, i * 2); 423 const uint64_t ret = float32_to_float64(a, &env->fpu_status); 424 425 s390_vec_write_element64(&tmp, i, ret); 426 /* indicate the source element */ 427 vxc = check_ieee_exc(env, i * 2, false, &vec_exc); 428 if (s || vxc) { 429 break; 430 } 431 } 432 handle_ieee_exc(env, vxc, vec_exc, retaddr); 433 *v1 = tmp; 434 } 435 436 void HELPER(gvec_vfll32)(void *v1, const void *v2, CPUS390XState *env, 437 uint32_t desc) 438 { 439 vfll32(v1, v2, env, false, GETPC()); 440 } 441 442 void HELPER(gvec_vfll32s)(void *v1, const void *v2, CPUS390XState *env, 443 uint32_t desc) 444 { 445 vfll32(v1, v2, env, true, GETPC()); 446 } 447 448 static void vflr64(S390Vector *v1, const S390Vector *v2, CPUS390XState *env, 449 bool s, bool XxC, uint8_t erm, uintptr_t retaddr) 450 { 451 uint8_t vxc, vec_exc = 0; 452 S390Vector tmp = {}; 453 int i, old_mode; 454 455 old_mode = s390_swap_bfp_rounding_mode(env, erm); 456 for (i = 0; i < 2; i++) { 457 float64 a = s390_vec_read_element64(v2, i); 458 uint32_t ret = float64_to_float32(a, &env->fpu_status); 459 460 /* place at even element */ 461 s390_vec_write_element32(&tmp, i * 2, ret); 462 /* indicate the source element */ 463 vxc = check_ieee_exc(env, i, XxC, &vec_exc); 464 if (s || vxc) { 465 break; 466 } 467 } 468 s390_restore_bfp_rounding_mode(env, old_mode); 469 handle_ieee_exc(env, vxc, vec_exc, retaddr); 470 *v1 = tmp; 471 } 472 473 void HELPER(gvec_vflr64)(void *v1, const void *v2, CPUS390XState *env, 474 uint32_t desc) 475 { 476 const uint8_t erm = extract32(simd_data(desc), 4, 4); 477 const bool XxC = extract32(simd_data(desc), 2, 1); 478 479 vflr64(v1, v2, env, false, XxC, erm, GETPC()); 480 } 481 482 void HELPER(gvec_vflr64s)(void *v1, const void *v2, CPUS390XState *env, 483 uint32_t desc) 484 { 485 const uint8_t erm = extract32(simd_data(desc), 4, 4); 486 const bool XxC = extract32(simd_data(desc), 2, 1); 487 488 vflr64(v1, v2, env, true, XxC, erm, GETPC()); 489 } 490 491 static uint64_t vfm64(uint64_t a, uint64_t b, float_status *s) 492 { 493 return float64_mul(a, b, s); 494 } 495 496 void HELPER(gvec_vfm64)(void *v1, const void *v2, const void *v3, 497 CPUS390XState *env, uint32_t desc) 498 { 499 vop64_3(v1, v2, v3, env, false, vfm64, GETPC()); 500 } 501 502 void HELPER(gvec_vfm64s)(void *v1, const void *v2, const void *v3, 503 CPUS390XState *env, uint32_t desc) 504 { 505 vop64_3(v1, v2, v3, env, true, vfm64, GETPC()); 506 } 507 508 static void vfma64(S390Vector *v1, const S390Vector *v2, const S390Vector *v3, 509 const S390Vector *v4, CPUS390XState *env, bool s, int flags, 510 uintptr_t retaddr) 511 { 512 uint8_t vxc, vec_exc = 0; 513 S390Vector tmp = {}; 514 int i; 515 516 for (i = 0; i < 2; i++) { 517 const uint64_t a = s390_vec_read_element64(v2, i); 518 const uint64_t b = s390_vec_read_element64(v3, i); 519 const uint64_t c = s390_vec_read_element64(v4, i); 520 uint64_t ret = float64_muladd(a, b, c, flags, &env->fpu_status); 521 522 s390_vec_write_element64(&tmp, i, ret); 523 vxc = check_ieee_exc(env, i, false, &vec_exc); 524 if (s || vxc) { 525 break; 526 } 527 } 528 handle_ieee_exc(env, vxc, vec_exc, retaddr); 529 *v1 = tmp; 530 } 531 532 void HELPER(gvec_vfma64)(void *v1, const void *v2, const void *v3, 533 const void *v4, CPUS390XState *env, uint32_t desc) 534 { 535 vfma64(v1, v2, v3, v4, env, false, 0, GETPC()); 536 } 537 538 void HELPER(gvec_vfma64s)(void *v1, const void *v2, const void *v3, 539 const void *v4, CPUS390XState *env, uint32_t desc) 540 { 541 vfma64(v1, v2, v3, v4, env, true, 0, GETPC()); 542 } 543 544 void HELPER(gvec_vfms64)(void *v1, const void *v2, const void *v3, 545 const void *v4, CPUS390XState *env, uint32_t desc) 546 { 547 vfma64(v1, v2, v3, v4, env, false, float_muladd_negate_c, GETPC()); 548 } 549 550 void HELPER(gvec_vfms64s)(void *v1, const void *v2, const void *v3, 551 const void *v4, CPUS390XState *env, uint32_t desc) 552 { 553 vfma64(v1, v2, v3, v4, env, true, float_muladd_negate_c, GETPC()); 554 } 555