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