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