target-s390x/fpu_helper.c

   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 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 "cpu.h"
  22 #include "helper.h"
  23
  24 #if !defined(CONFIG_USER_ONLY)
  25 #include "exec/softmmu_exec.h"
  26 #endif
  27
  28 /* #define DEBUG_HELPER */
  29 #ifdef DEBUG_HELPER
  30 #define HELPER_LOG(x...) qemu_log(x)
  31 #else
  32 #define HELPER_LOG(x...)
  33 #endif
  34
  35 #define RET128(F) (env->retxl = F.low, F.high)
  36
  37 #define convert_bit(mask, from, to) \
  38     (to < from                      \
  39      ? (mask / (from / to)) & to    \
  40      : (mask & from) * (to / from))
  41
  42 static void ieee_exception(CPUS390XState *env, uint32_t dxc, uintptr_t retaddr)
  43 {
  44     /* Install the DXC code.  */
  45     env->fpc = (env->fpc & ~0xff00) | (dxc << 8);
  46     /* Trap.  */
  47     runtime_exception(env, PGM_DATA, retaddr);
  48 }
  49
  50 /* Should be called after any operation that may raise IEEE exceptions.  */
  51 static void handle_exceptions(CPUS390XState *env, uintptr_t retaddr)
  52 {
  53     unsigned s390_exc, qemu_exc;
  54
  55     /* Get the exceptions raised by the current operation.  Reset the
  56        fpu_status contents so that the next operation has a clean slate.  */
  57     qemu_exc = env->fpu_status.float_exception_flags;
  58     if (qemu_exc == 0) {
  59         return;
  60     }
  61     env->fpu_status.float_exception_flags = 0;
  62
  63     /* Convert softfloat exception bits to s390 exception bits.  */
  64     s390_exc = 0;
  65     s390_exc |= convert_bit(qemu_exc, float_flag_invalid, 0x80);
  66     s390_exc |= convert_bit(qemu_exc, float_flag_divbyzero, 0x40);
  67     s390_exc |= convert_bit(qemu_exc, float_flag_overflow, 0x20);
  68     s390_exc |= convert_bit(qemu_exc, float_flag_underflow, 0x10);
  69     s390_exc |= convert_bit(qemu_exc, float_flag_inexact, 0x08);
  70
  71     /* Install the exceptions that we raised.  */
  72     env->fpc |= s390_exc << 16;
  73
  74     /* Send signals for enabled exceptions.  */
  75     s390_exc &= env->fpc >> 24;
  76     if (s390_exc) {
  77         ieee_exception(env, s390_exc, retaddr);
  78     }
  79 }
  80
  81 static inline int float_comp_to_cc(CPUS390XState *env, int float_compare)
  82 {
  83     S390CPU *cpu = s390_env_get_cpu(env);
  84
  85     switch (float_compare) {
  86     case float_relation_equal:
  87         return 0;
  88     case float_relation_less:
  89         return 1;
  90     case float_relation_greater:
  91         return 2;
  92     case float_relation_unordered:
  93         return 3;
  94     default:
  95         cpu_abort(CPU(cpu), "unknown return value for float compare\n");
  96     }
  97 }
  98
  99 /* condition codes for unary FP ops */
 100 uint32_t set_cc_nz_f32(float32 v)
 101 {
 102     if (float32_is_any_nan(v)) {
 103         return 3;
 104     } else if (float32_is_zero(v)) {
 105         return 0;
 106     } else if (float32_is_neg(v)) {
 107         return 1;
 108     } else {
 109         return 2;
 110     }
 111 }
 112
 113 uint32_t set_cc_nz_f64(float64 v)
 114 {
 115     if (float64_is_any_nan(v)) {
 116         return 3;
 117     } else if (float64_is_zero(v)) {
 118         return 0;
 119     } else if (float64_is_neg(v)) {
 120         return 1;
 121     } else {
 122         return 2;
 123     }
 124 }
 125
 126 uint32_t set_cc_nz_f128(float128 v)
 127 {
 128     if (float128_is_any_nan(v)) {
 129         return 3;
 130     } else if (float128_is_zero(v)) {
 131         return 0;
 132     } else if (float128_is_neg(v)) {
 133         return 1;
 134     } else {
 135         return 2;
 136     }
 137 }
 138
 139 /* 32-bit FP addition */
 140 uint64_t HELPER(aeb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 141 {
 142     float32 ret = float32_add(f1, f2, &env->fpu_status);
 143     handle_exceptions(env, GETPC());
 144     return ret;
 145 }
 146
 147 /* 64-bit FP addition */
 148 uint64_t HELPER(adb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 149 {
 150     float64 ret = float64_add(f1, f2, &env->fpu_status);
 151     handle_exceptions(env, GETPC());
 152     return ret;
 153 }
 154
 155 /* 128-bit FP addition */
 156 uint64_t HELPER(axb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 157                      uint64_t bh, uint64_t bl)
 158 {
 159     float128 ret = float128_add(make_float128(ah, al),
 160                                 make_float128(bh, bl),
 161                                 &env->fpu_status);
 162     handle_exceptions(env, GETPC());
 163     return RET128(ret);
 164 }
 165
 166 /* 32-bit FP subtraction */
 167 uint64_t HELPER(seb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 168 {
 169     float32 ret = float32_sub(f1, f2, &env->fpu_status);
 170     handle_exceptions(env, GETPC());
 171     return ret;
 172 }
 173
 174 /* 64-bit FP subtraction */
 175 uint64_t HELPER(sdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 176 {
 177     float64 ret = float64_sub(f1, f2, &env->fpu_status);
 178     handle_exceptions(env, GETPC());
 179     return ret;
 180 }
 181
 182 /* 128-bit FP subtraction */
 183 uint64_t HELPER(sxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 184                      uint64_t bh, uint64_t bl)
 185 {
 186     float128 ret = float128_sub(make_float128(ah, al),
 187                                 make_float128(bh, bl),
 188                                 &env->fpu_status);
 189     handle_exceptions(env, GETPC());
 190     return RET128(ret);
 191 }
 192
 193 /* 32-bit FP division */
 194 uint64_t HELPER(deb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 195 {
 196     float32 ret = float32_div(f1, f2, &env->fpu_status);
 197     handle_exceptions(env, GETPC());
 198     return ret;
 199 }
 200
 201 /* 64-bit FP division */
 202 uint64_t HELPER(ddb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 203 {
 204     float64 ret = float64_div(f1, f2, &env->fpu_status);
 205     handle_exceptions(env, GETPC());
 206     return ret;
 207 }
 208
 209 /* 128-bit FP division */
 210 uint64_t HELPER(dxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 211                      uint64_t bh, uint64_t bl)
 212 {
 213     float128 ret = float128_div(make_float128(ah, al),
 214                                 make_float128(bh, bl),
 215                                 &env->fpu_status);
 216     handle_exceptions(env, GETPC());
 217     return RET128(ret);
 218 }
 219
 220 /* 32-bit FP multiplication */
 221 uint64_t HELPER(meeb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 222 {
 223     float32 ret = float32_mul(f1, f2, &env->fpu_status);
 224     handle_exceptions(env, GETPC());
 225     return ret;
 226 }
 227
 228 /* 64-bit FP multiplication */
 229 uint64_t HELPER(mdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 230 {
 231     float64 ret = float64_mul(f1, f2, &env->fpu_status);
 232     handle_exceptions(env, GETPC());
 233     return ret;
 234 }
 235
 236 /* 64/32-bit FP multiplication */
 237 uint64_t HELPER(mdeb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 238 {
 239     float64 ret = float32_to_float64(f2, &env->fpu_status);
 240     ret = float64_mul(f1, ret, &env->fpu_status);
 241     handle_exceptions(env, GETPC());
 242     return ret;
 243 }
 244
 245 /* 128-bit FP multiplication */
 246 uint64_t HELPER(mxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 247                      uint64_t bh, uint64_t bl)
 248 {
 249     float128 ret = float128_mul(make_float128(ah, al),
 250                                 make_float128(bh, bl),
 251                                 &env->fpu_status);
 252     handle_exceptions(env, GETPC());
 253     return RET128(ret);
 254 }
 255
 256 /* 128/64-bit FP multiplication */
 257 uint64_t HELPER(mxdb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 258                       uint64_t f2)
 259 {
 260     float128 ret = float64_to_float128(f2, &env->fpu_status);
 261     ret = float128_mul(make_float128(ah, al), ret, &env->fpu_status);
 262     handle_exceptions(env, GETPC());
 263     return RET128(ret);
 264 }
 265
 266 /* convert 32-bit float to 64-bit float */
 267 uint64_t HELPER(ldeb)(CPUS390XState *env, uint64_t f2)
 268 {
 269     float64 ret = float32_to_float64(f2, &env->fpu_status);
 270     handle_exceptions(env, GETPC());
 271     return ret;
 272 }
 273
 274 /* convert 128-bit float to 64-bit float */
 275 uint64_t HELPER(ldxb)(CPUS390XState *env, uint64_t ah, uint64_t al)
 276 {
 277     float64 ret = float128_to_float64(make_float128(ah, al), &env->fpu_status);
 278     handle_exceptions(env, GETPC());
 279     return ret;
 280 }
 281
 282 /* convert 64-bit float to 128-bit float */
 283 uint64_t HELPER(lxdb)(CPUS390XState *env, uint64_t f2)
 284 {
 285     float128 ret = float64_to_float128(f2, &env->fpu_status);
 286     handle_exceptions(env, GETPC());
 287     return RET128(ret);
 288 }
 289
 290 /* convert 32-bit float to 128-bit float */
 291 uint64_t HELPER(lxeb)(CPUS390XState *env, uint64_t f2)
 292 {
 293     float128 ret = float32_to_float128(f2, &env->fpu_status);
 294     handle_exceptions(env, GETPC());
 295     return RET128(ret);
 296 }
 297
 298 /* convert 64-bit float to 32-bit float */
 299 uint64_t HELPER(ledb)(CPUS390XState *env, uint64_t f2)
 300 {
 301     float32 ret = float64_to_float32(f2, &env->fpu_status);
 302     handle_exceptions(env, GETPC());
 303     return ret;
 304 }
 305
 306 /* convert 128-bit float to 32-bit float */
 307 uint64_t HELPER(lexb)(CPUS390XState *env, uint64_t ah, uint64_t al)
 308 {
 309     float32 ret = float128_to_float32(make_float128(ah, al), &env->fpu_status);
 310     handle_exceptions(env, GETPC());
 311     return ret;
 312 }
 313
 314 /* 32-bit FP compare */
 315 uint32_t HELPER(ceb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 316 {
 317     int cmp = float32_compare_quiet(f1, f2, &env->fpu_status);
 318     handle_exceptions(env, GETPC());
 319     return float_comp_to_cc(env, cmp);
 320 }
 321
 322 /* 64-bit FP compare */
 323 uint32_t HELPER(cdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 324 {
 325     int cmp = float64_compare_quiet(f1, f2, &env->fpu_status);
 326     handle_exceptions(env, GETPC());
 327     return float_comp_to_cc(env, cmp);
 328 }
 329
 330 /* 128-bit FP compare */
 331 uint32_t HELPER(cxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 332                      uint64_t bh, uint64_t bl)
 333 {
 334     int cmp = float128_compare_quiet(make_float128(ah, al),
 335                                      make_float128(bh, bl),
 336                                      &env->fpu_status);
 337     handle_exceptions(env, GETPC());
 338     return float_comp_to_cc(env, cmp);
 339 }
 340
 341 static int swap_round_mode(CPUS390XState *env, int m3)
 342 {
 343     int ret = env->fpu_status.float_rounding_mode;
 344     switch (m3) {
 345     case 0:
 346         /* current mode */
 347         break;
 348     case 1:
 349         /* biased round no nearest */
 350     case 4:
 351         /* round to nearest */
 352         set_float_rounding_mode(float_round_nearest_even, &env->fpu_status);
 353         break;
 354     case 5:
 355         /* round to zero */
 356         set_float_rounding_mode(float_round_to_zero, &env->fpu_status);
 357         break;
 358     case 6:
 359         /* round to +inf */
 360         set_float_rounding_mode(float_round_up, &env->fpu_status);
 361         break;
 362     case 7:
 363         /* round to -inf */
 364         set_float_rounding_mode(float_round_down, &env->fpu_status);
 365         break;
 366     }
 367     return ret;
 368 }
 369
 370 /* convert 64-bit int to 32-bit float */
 371 uint64_t HELPER(cegb)(CPUS390XState *env, int64_t v2, uint32_t m3)
 372 {
 373     int hold = swap_round_mode(env, m3);
 374     float32 ret = int64_to_float32(v2, &env->fpu_status);
 375     set_float_rounding_mode(hold, &env->fpu_status);
 376     handle_exceptions(env, GETPC());
 377     return ret;
 378 }
 379
 380 /* convert 64-bit int to 64-bit float */
 381 uint64_t HELPER(cdgb)(CPUS390XState *env, int64_t v2, uint32_t m3)
 382 {
 383     int hold = swap_round_mode(env, m3);
 384     float64 ret = int64_to_float64(v2, &env->fpu_status);
 385     set_float_rounding_mode(hold, &env->fpu_status);
 386     handle_exceptions(env, GETPC());
 387     return ret;
 388 }
 389
 390 /* convert 64-bit int to 128-bit float */
 391 uint64_t HELPER(cxgb)(CPUS390XState *env, int64_t v2, uint32_t m3)
 392 {
 393     int hold = swap_round_mode(env, m3);
 394     float128 ret = int64_to_float128(v2, &env->fpu_status);
 395     set_float_rounding_mode(hold, &env->fpu_status);
 396     handle_exceptions(env, GETPC());
 397     return RET128(ret);
 398 }
 399
 400 /* convert 64-bit uint to 32-bit float */
 401 uint64_t HELPER(celgb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
 402 {
 403     int hold = swap_round_mode(env, m3);
 404     float32 ret = uint64_to_float32(v2, &env->fpu_status);
 405     set_float_rounding_mode(hold, &env->fpu_status);
 406     handle_exceptions(env, GETPC());
 407     return ret;
 408 }
 409
 410 /* convert 64-bit uint to 64-bit float */
 411 uint64_t HELPER(cdlgb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
 412 {
 413     int hold = swap_round_mode(env, m3);
 414     float64 ret = uint64_to_float64(v2, &env->fpu_status);
 415     set_float_rounding_mode(hold, &env->fpu_status);
 416     handle_exceptions(env, GETPC());
 417     return ret;
 418 }
 419
 420 /* convert 64-bit uint to 128-bit float */
 421 uint64_t HELPER(cxlgb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
 422 {
 423     int hold = swap_round_mode(env, m3);
 424     float128 ret = uint64_to_float128(v2, &env->fpu_status);
 425     set_float_rounding_mode(hold, &env->fpu_status);
 426     handle_exceptions(env, GETPC());
 427     return RET128(ret);
 428 }
 429
 430 /* convert 32-bit float to 64-bit int */
 431 uint64_t HELPER(cgeb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
 432 {
 433     int hold = swap_round_mode(env, m3);
 434     int64_t ret = float32_to_int64(v2, &env->fpu_status);
 435     set_float_rounding_mode(hold, &env->fpu_status);
 436     handle_exceptions(env, GETPC());
 437     return ret;
 438 }
 439
 440 /* convert 64-bit float to 64-bit int */
 441 uint64_t HELPER(cgdb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
 442 {
 443     int hold = swap_round_mode(env, m3);
 444     int64_t ret = float64_to_int64(v2, &env->fpu_status);
 445     set_float_rounding_mode(hold, &env->fpu_status);
 446     handle_exceptions(env, GETPC());
 447     return ret;
 448 }
 449
 450 /* convert 128-bit float to 64-bit int */
 451 uint64_t HELPER(cgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3)
 452 {
 453     int hold = swap_round_mode(env, m3);
 454     float128 v2 = make_float128(h, l);
 455     int64_t ret = float128_to_int64(v2, &env->fpu_status);
 456     set_float_rounding_mode(hold, &env->fpu_status);
 457     handle_exceptions(env, GETPC());
 458     return ret;
 459 }
 460
 461 /* convert 32-bit float to 32-bit int */
 462 uint64_t HELPER(cfeb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
 463 {
 464     int hold = swap_round_mode(env, m3);
 465     int32_t ret = float32_to_int32(v2, &env->fpu_status);
 466     set_float_rounding_mode(hold, &env->fpu_status);
 467     handle_exceptions(env, GETPC());
 468     return ret;
 469 }
 470
 471 /* convert 64-bit float to 32-bit int */
 472 uint64_t HELPER(cfdb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
 473 {
 474     int hold = swap_round_mode(env, m3);
 475     int32_t ret = float64_to_int32(v2, &env->fpu_status);
 476     set_float_rounding_mode(hold, &env->fpu_status);
 477     handle_exceptions(env, GETPC());
 478     return ret;
 479 }
 480
 481 /* convert 128-bit float to 32-bit int */
 482 uint64_t HELPER(cfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3)
 483 {
 484     int hold = swap_round_mode(env, m3);
 485     float128 v2 = make_float128(h, l);
 486     int32_t ret = float128_to_int32(v2, &env->fpu_status);
 487     set_float_rounding_mode(hold, &env->fpu_status);
 488     handle_exceptions(env, GETPC());
 489     return ret;
 490 }
 491
 492 /* convert 32-bit float to 64-bit uint */
 493 uint64_t HELPER(clgeb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
 494 {
 495     int hold = swap_round_mode(env, m3);
 496     uint64_t ret;
 497     v2 = float32_to_float64(v2, &env->fpu_status);
 498     ret = float64_to_uint64(v2, &env->fpu_status);
 499     set_float_rounding_mode(hold, &env->fpu_status);
 500     handle_exceptions(env, GETPC());
 501     return ret;
 502 }
 503
 504 /* convert 64-bit float to 64-bit uint */
 505 uint64_t HELPER(clgdb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
 506 {
 507     int hold = swap_round_mode(env, m3);
 508     uint64_t ret = float64_to_uint64(v2, &env->fpu_status);
 509     set_float_rounding_mode(hold, &env->fpu_status);
 510     handle_exceptions(env, GETPC());
 511     return ret;
 512 }
 513
 514 /* convert 128-bit float to 64-bit uint */
 515 uint64_t HELPER(clgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3)
 516 {
 517     int hold = swap_round_mode(env, m3);
 518     float128 v2 = make_float128(h, l);
 519     /* ??? Not 100% correct.  */
 520     uint64_t ret = float128_to_int64(v2, &env->fpu_status);
 521     set_float_rounding_mode(hold, &env->fpu_status);
 522     handle_exceptions(env, GETPC());
 523     return ret;
 524 }
 525
 526 /* convert 32-bit float to 32-bit uint */
 527 uint64_t HELPER(clfeb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
 528 {
 529     int hold = swap_round_mode(env, m3);
 530     uint32_t ret = float32_to_uint32(v2, &env->fpu_status);
 531     set_float_rounding_mode(hold, &env->fpu_status);
 532     handle_exceptions(env, GETPC());
 533     return ret;
 534 }
 535
 536 /* convert 64-bit float to 32-bit uint */
 537 uint64_t HELPER(clfdb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
 538 {
 539     int hold = swap_round_mode(env, m3);
 540     uint32_t ret = float64_to_uint32(v2, &env->fpu_status);
 541     set_float_rounding_mode(hold, &env->fpu_status);
 542     handle_exceptions(env, GETPC());
 543     return ret;
 544 }
 545
 546 /* convert 128-bit float to 32-bit uint */
 547 uint64_t HELPER(clfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3)
 548 {
 549     int hold = swap_round_mode(env, m3);
 550     float128 v2 = make_float128(h, l);
 551     /* Not 100% correct.  */
 552     uint32_t ret = float128_to_int64(v2, &env->fpu_status);
 553     set_float_rounding_mode(hold, &env->fpu_status);
 554     handle_exceptions(env, GETPC());
 555     return ret;
 556 }
 557
 558 /* 32-bit FP multiply and add */
 559 uint64_t HELPER(maeb)(CPUS390XState *env, uint64_t f1,
 560                       uint64_t f2, uint64_t f3)
 561 {
 562     float32 ret = float32_muladd(f2, f3, f1, 0, &env->fpu_status);
 563     handle_exceptions(env, GETPC());
 564     return ret;
 565 }
 566
 567 /* 64-bit FP multiply and add */
 568 uint64_t HELPER(madb)(CPUS390XState *env, uint64_t f1,
 569                       uint64_t f2, uint64_t f3)
 570 {
 571     float64 ret = float64_muladd(f2, f3, f1, 0, &env->fpu_status);
 572     handle_exceptions(env, GETPC());
 573     return ret;
 574 }
 575
 576 /* 32-bit FP multiply and subtract */
 577 uint64_t HELPER(mseb)(CPUS390XState *env, uint64_t f1,
 578                       uint64_t f2, uint64_t f3)
 579 {
 580     float32 ret = float32_muladd(f2, f3, f1, float_muladd_negate_c,
 581                                  &env->fpu_status);
 582     handle_exceptions(env, GETPC());
 583     return ret;
 584 }
 585
 586 /* 64-bit FP multiply and subtract */
 587 uint64_t HELPER(msdb)(CPUS390XState *env, uint64_t f1,
 588                       uint64_t f2, uint64_t f3)
 589 {
 590     float64 ret = float64_muladd(f2, f3, f1, float_muladd_negate_c,
 591                                  &env->fpu_status);
 592     handle_exceptions(env, GETPC());
 593     return ret;
 594 }
 595
 596 /* test data class 32-bit */
 597 uint32_t HELPER(tceb)(uint64_t f1, uint64_t m2)
 598 {
 599     float32 v1 = f1;
 600     int neg = float32_is_neg(v1);
 601     uint32_t cc = 0;
 602
 603     if ((float32_is_zero(v1) && (m2 & (1 << (11-neg)))) ||
 604         (float32_is_infinity(v1) && (m2 & (1 << (5-neg)))) ||
 605         (float32_is_any_nan(v1) && (m2 & (1 << (3-neg)))) ||
 606         (float32_is_signaling_nan(v1) && (m2 & (1 << (1-neg))))) {
 607         cc = 1;
 608     } else if (m2 & (1 << (9-neg))) {
 609         /* assume normalized number */
 610         cc = 1;
 611     }
 612     /* FIXME: denormalized? */
 613     return cc;
 614 }
 615
 616 /* test data class 64-bit */
 617 uint32_t HELPER(tcdb)(uint64_t v1, uint64_t m2)
 618 {
 619     int neg = float64_is_neg(v1);
 620     uint32_t cc = 0;
 621
 622     if ((float64_is_zero(v1) && (m2 & (1 << (11-neg)))) ||
 623         (float64_is_infinity(v1) && (m2 & (1 << (5-neg)))) ||
 624         (float64_is_any_nan(v1) && (m2 & (1 << (3-neg)))) ||
 625         (float64_is_signaling_nan(v1) && (m2 & (1 << (1-neg))))) {
 626         cc = 1;
 627     } else if (m2 & (1 << (9-neg))) {
 628         /* assume normalized number */
 629         cc = 1;
 630     }
 631     /* FIXME: denormalized? */
 632     return cc;
 633 }
 634
 635 /* test data class 128-bit */
 636 uint32_t HELPER(tcxb)(uint64_t ah, uint64_t al, uint64_t m2)
 637 {
 638     float128 v1 = make_float128(ah, al);
 639     int neg = float128_is_neg(v1);
 640     uint32_t cc = 0;
 641
 642     if ((float128_is_zero(v1) && (m2 & (1 << (11-neg)))) ||
 643         (float128_is_infinity(v1) && (m2 & (1 << (5-neg)))) ||
 644         (float128_is_any_nan(v1) && (m2 & (1 << (3-neg)))) ||
 645         (float128_is_signaling_nan(v1) && (m2 & (1 << (1-neg))))) {
 646         cc = 1;
 647     } else if (m2 & (1 << (9-neg))) {
 648         /* assume normalized number */
 649         cc = 1;
 650     }
 651     /* FIXME: denormalized? */
 652     return cc;
 653 }
 654
 655 /* square root 32-bit */
 656 uint64_t HELPER(sqeb)(CPUS390XState *env, uint64_t f2)
 657 {
 658     float32 ret = float32_sqrt(f2, &env->fpu_status);
 659     handle_exceptions(env, GETPC());
 660     return ret;
 661 }
 662
 663 /* square root 64-bit */
 664 uint64_t HELPER(sqdb)(CPUS390XState *env, uint64_t f2)
 665 {
 666     float64 ret = float64_sqrt(f2, &env->fpu_status);
 667     handle_exceptions(env, GETPC());
 668     return ret;
 669 }
 670
 671 /* square root 128-bit */
 672 uint64_t HELPER(sqxb)(CPUS390XState *env, uint64_t ah, uint64_t al)
 673 {
 674     float128 ret = float128_sqrt(make_float128(ah, al), &env->fpu_status);
 675     handle_exceptions(env, GETPC());
 676     return RET128(ret);
 677 }
 678
 679 static const int fpc_to_rnd[4] = {
 680     float_round_nearest_even,
 681     float_round_to_zero,
 682     float_round_up,
 683     float_round_down
 684 };
 685
 686 /* set fpc */
 687 void HELPER(sfpc)(CPUS390XState *env, uint64_t fpc)
 688 {
 689     /* Install everything in the main FPC.  */
 690     env->fpc = fpc;
 691
 692     /* Install the rounding mode in the shadow fpu_status.  */
 693     set_float_rounding_mode(fpc_to_rnd[fpc & 3], &env->fpu_status);
 694 }
 695
 696 /* set fpc and signal */
 697 void HELPER(sfas)(CPUS390XState *env, uint64_t val)
 698 {
 699     uint32_t signalling = env->fpc;
 700     uint32_t source = val;
 701     uint32_t s390_exc;
 702
 703     /* The contents of the source operand are placed in the FPC register;
 704        then the flags in the FPC register are set to the logical OR of the
 705        signalling flags and the source flags.  */
 706     env->fpc = source | (signalling & 0x00ff0000);
 707     set_float_rounding_mode(fpc_to_rnd[source & 3], &env->fpu_status);
 708
 709     /* If any signalling flag is 1 and the corresponding source mask
 710        is also 1, a simulated-iee-exception trap occurs.  */
 711     s390_exc = (signalling >> 16) & (source >> 24);
 712     if (s390_exc) {
 713         ieee_exception(env, s390_exc | 3, GETPC());
 714     }
 715 }