qemu/target/s390x/tcg/fpu_helper.c
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   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#define RET128(F) (env->retxl = F.low, F.high)
  38
  39uint8_t s390_softfloat_exc_to_ieee(unsigned int exc)
  40{
  41    uint8_t s390_exc = 0;
  42
  43    s390_exc |= (exc & float_flag_invalid) ? S390_IEEE_MASK_INVALID : 0;
  44    s390_exc |= (exc & float_flag_divbyzero) ? S390_IEEE_MASK_DIVBYZERO : 0;
  45    s390_exc |= (exc & float_flag_overflow) ? S390_IEEE_MASK_OVERFLOW : 0;
  46    s390_exc |= (exc & float_flag_underflow) ? S390_IEEE_MASK_UNDERFLOW : 0;
  47    s390_exc |= (exc & float_flag_inexact) ? S390_IEEE_MASK_INEXACT : 0;
  48
  49    return s390_exc;
  50}
  51
  52/* Should be called after any operation that may raise IEEE exceptions.  */
  53static void handle_exceptions(CPUS390XState *env, bool XxC, uintptr_t retaddr)
  54{
  55    unsigned s390_exc, qemu_exc;
  56
  57    /* Get the exceptions raised by the current operation.  Reset the
  58       fpu_status contents so that the next operation has a clean slate.  */
  59    qemu_exc = env->fpu_status.float_exception_flags;
  60    if (qemu_exc == 0) {
  61        return;
  62    }
  63    env->fpu_status.float_exception_flags = 0;
  64    s390_exc = s390_softfloat_exc_to_ieee(qemu_exc);
  65
  66    /*
  67     * IEEE-Underflow exception recognition exists if a tininess condition
  68     * (underflow) exists and
  69     * - The mask bit in the FPC is zero and the result is inexact
  70     * - The mask bit in the FPC is one
  71     * So tininess conditions that are not inexact don't trigger any
  72     * underflow action in case the mask bit is not one.
  73     */
  74    if (!(s390_exc & S390_IEEE_MASK_INEXACT) &&
  75        !((env->fpc >> 24) & S390_IEEE_MASK_UNDERFLOW)) {
  76        s390_exc &= ~S390_IEEE_MASK_UNDERFLOW;
  77    }
  78
  79    /*
  80     * FIXME:
  81     * 1. Right now, all inexact conditions are inidicated as
  82     *    "truncated" (0) and never as "incremented" (1) in the DXC.
  83     * 2. Only traps due to invalid/divbyzero are suppressing. Other traps
  84     *    are completing, meaning the target register has to be written!
  85     *    This, however will mean that we have to write the register before
  86     *    triggering the trap - impossible right now.
  87     */
  88
  89    /*
  90     * invalid/divbyzero cannot coexist with other conditions.
  91     * overflow/underflow however can coexist with inexact, we have to
  92     * handle it separately.
  93     */
  94    if (s390_exc & ~S390_IEEE_MASK_INEXACT) {
  95        if (s390_exc & ~S390_IEEE_MASK_INEXACT & env->fpc >> 24) {
  96            /* trap condition - inexact reported along */
  97            tcg_s390_data_exception(env, s390_exc, retaddr);
  98        }
  99        /* nontrap condition - inexact handled differently */
 100        env->fpc |= (s390_exc & ~S390_IEEE_MASK_INEXACT) << 16;
 101    }
 102
 103    /* inexact handling */
 104    if (s390_exc & S390_IEEE_MASK_INEXACT && !XxC) {
 105        /* trap condition - overflow/underflow _not_ reported along */
 106        if (s390_exc & S390_IEEE_MASK_INEXACT & env->fpc >> 24) {
 107            tcg_s390_data_exception(env, s390_exc & S390_IEEE_MASK_INEXACT,
 108                                    retaddr);
 109        }
 110        /* nontrap condition */
 111        env->fpc |= (s390_exc & S390_IEEE_MASK_INEXACT) << 16;
 112    }
 113}
 114
 115int float_comp_to_cc(CPUS390XState *env, FloatRelation float_compare)
 116{
 117    switch (float_compare) {
 118    case float_relation_equal:
 119        return 0;
 120    case float_relation_less:
 121        return 1;
 122    case float_relation_greater:
 123        return 2;
 124    case float_relation_unordered:
 125        return 3;
 126    default:
 127        cpu_abort(env_cpu(env), "unknown return value for float compare\n");
 128    }
 129}
 130
 131/* condition codes for unary FP ops */
 132uint32_t set_cc_nz_f32(float32 v)
 133{
 134    if (float32_is_any_nan(v)) {
 135        return 3;
 136    } else if (float32_is_zero(v)) {
 137        return 0;
 138    } else if (float32_is_neg(v)) {
 139        return 1;
 140    } else {
 141        return 2;
 142    }
 143}
 144
 145uint32_t set_cc_nz_f64(float64 v)
 146{
 147    if (float64_is_any_nan(v)) {
 148        return 3;
 149    } else if (float64_is_zero(v)) {
 150        return 0;
 151    } else if (float64_is_neg(v)) {
 152        return 1;
 153    } else {
 154        return 2;
 155    }
 156}
 157
 158uint32_t set_cc_nz_f128(float128 v)
 159{
 160    if (float128_is_any_nan(v)) {
 161        return 3;
 162    } else if (float128_is_zero(v)) {
 163        return 0;
 164    } else if (float128_is_neg(v)) {
 165        return 1;
 166    } else {
 167        return 2;
 168    }
 169}
 170
 171/* condition codes for FP to integer conversion ops */
 172static uint32_t set_cc_conv_f32(float32 v, float_status *stat)
 173{
 174    if (stat->float_exception_flags & float_flag_invalid) {
 175        return 3;
 176    } else {
 177        return set_cc_nz_f32(v);
 178    }
 179}
 180
 181static uint32_t set_cc_conv_f64(float64 v, float_status *stat)
 182{
 183    if (stat->float_exception_flags & float_flag_invalid) {
 184        return 3;
 185    } else {
 186        return set_cc_nz_f64(v);
 187    }
 188}
 189
 190static uint32_t set_cc_conv_f128(float128 v, float_status *stat)
 191{
 192    if (stat->float_exception_flags & float_flag_invalid) {
 193        return 3;
 194    } else {
 195        return set_cc_nz_f128(v);
 196    }
 197}
 198
 199static inline uint8_t round_from_m34(uint32_t m34)
 200{
 201    return extract32(m34, 0, 4);
 202}
 203
 204static inline bool xxc_from_m34(uint32_t m34)
 205{
 206    /* XxC is bit 1 of m4 */
 207    return extract32(m34, 4 + 3 - 1, 1);
 208}
 209
 210/* 32-bit FP addition */
 211uint64_t HELPER(aeb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 212{
 213    float32 ret = float32_add(f1, f2, &env->fpu_status);
 214    handle_exceptions(env, false, GETPC());
 215    return ret;
 216}
 217
 218/* 64-bit FP addition */
 219uint64_t HELPER(adb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 220{
 221    float64 ret = float64_add(f1, f2, &env->fpu_status);
 222    handle_exceptions(env, false, GETPC());
 223    return ret;
 224}
 225
 226/* 128-bit FP addition */
 227uint64_t HELPER(axb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 228                     uint64_t bh, uint64_t bl)
 229{
 230    float128 ret = float128_add(make_float128(ah, al),
 231                                make_float128(bh, bl),
 232                                &env->fpu_status);
 233    handle_exceptions(env, false, GETPC());
 234    return RET128(ret);
 235}
 236
 237/* 32-bit FP subtraction */
 238uint64_t HELPER(seb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 239{
 240    float32 ret = float32_sub(f1, f2, &env->fpu_status);
 241    handle_exceptions(env, false, GETPC());
 242    return ret;
 243}
 244
 245/* 64-bit FP subtraction */
 246uint64_t HELPER(sdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 247{
 248    float64 ret = float64_sub(f1, f2, &env->fpu_status);
 249    handle_exceptions(env, false, GETPC());
 250    return ret;
 251}
 252
 253/* 128-bit FP subtraction */
 254uint64_t HELPER(sxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 255                     uint64_t bh, uint64_t bl)
 256{
 257    float128 ret = float128_sub(make_float128(ah, al),
 258                                make_float128(bh, bl),
 259                                &env->fpu_status);
 260    handle_exceptions(env, false, GETPC());
 261    return RET128(ret);
 262}
 263
 264/* 32-bit FP division */
 265uint64_t HELPER(deb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 266{
 267    float32 ret = float32_div(f1, f2, &env->fpu_status);
 268    handle_exceptions(env, false, GETPC());
 269    return ret;
 270}
 271
 272/* 64-bit FP division */
 273uint64_t HELPER(ddb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 274{
 275    float64 ret = float64_div(f1, f2, &env->fpu_status);
 276    handle_exceptions(env, false, GETPC());
 277    return ret;
 278}
 279
 280/* 128-bit FP division */
 281uint64_t HELPER(dxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 282                     uint64_t bh, uint64_t bl)
 283{
 284    float128 ret = float128_div(make_float128(ah, al),
 285                                make_float128(bh, bl),
 286                                &env->fpu_status);
 287    handle_exceptions(env, false, GETPC());
 288    return RET128(ret);
 289}
 290
 291/* 32-bit FP multiplication */
 292uint64_t HELPER(meeb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 293{
 294    float32 ret = float32_mul(f1, f2, &env->fpu_status);
 295    handle_exceptions(env, false, GETPC());
 296    return ret;
 297}
 298
 299/* 64-bit FP multiplication */
 300uint64_t HELPER(mdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 301{
 302    float64 ret = float64_mul(f1, f2, &env->fpu_status);
 303    handle_exceptions(env, false, GETPC());
 304    return ret;
 305}
 306
 307/* 64/32-bit FP multiplication */
 308uint64_t HELPER(mdeb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 309{
 310    float64 ret = float32_to_float64(f2, &env->fpu_status);
 311    ret = float64_mul(f1, ret, &env->fpu_status);
 312    handle_exceptions(env, false, GETPC());
 313    return ret;
 314}
 315
 316/* 128-bit FP multiplication */
 317uint64_t HELPER(mxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 318                     uint64_t bh, uint64_t bl)
 319{
 320    float128 ret = float128_mul(make_float128(ah, al),
 321                                make_float128(bh, bl),
 322                                &env->fpu_status);
 323    handle_exceptions(env, false, GETPC());
 324    return RET128(ret);
 325}
 326
 327/* 128/64-bit FP multiplication */
 328uint64_t HELPER(mxdb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 329                      uint64_t f2)
 330{
 331    float128 ret = float64_to_float128(f2, &env->fpu_status);
 332    ret = float128_mul(make_float128(ah, al), ret, &env->fpu_status);
 333    handle_exceptions(env, false, GETPC());
 334    return RET128(ret);
 335}
 336
 337/* convert 32-bit float to 64-bit float */
 338uint64_t HELPER(ldeb)(CPUS390XState *env, uint64_t f2)
 339{
 340    float64 ret = float32_to_float64(f2, &env->fpu_status);
 341    handle_exceptions(env, false, GETPC());
 342    return ret;
 343}
 344
 345/* convert 128-bit float to 64-bit float */
 346uint64_t HELPER(ldxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 347                      uint32_t m34)
 348{
 349    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 350    float64 ret = float128_to_float64(make_float128(ah, al), &env->fpu_status);
 351
 352    s390_restore_bfp_rounding_mode(env, old_mode);
 353    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 354    return ret;
 355}
 356
 357/* convert 64-bit float to 128-bit float */
 358uint64_t HELPER(lxdb)(CPUS390XState *env, uint64_t f2)
 359{
 360    float128 ret = float64_to_float128(f2, &env->fpu_status);
 361    handle_exceptions(env, false, GETPC());
 362    return RET128(ret);
 363}
 364
 365/* convert 32-bit float to 128-bit float */
 366uint64_t HELPER(lxeb)(CPUS390XState *env, uint64_t f2)
 367{
 368    float128 ret = float32_to_float128(f2, &env->fpu_status);
 369    handle_exceptions(env, false, GETPC());
 370    return RET128(ret);
 371}
 372
 373/* convert 64-bit float to 32-bit float */
 374uint64_t HELPER(ledb)(CPUS390XState *env, uint64_t f2, uint32_t m34)
 375{
 376    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 377    float32 ret = float64_to_float32(f2, &env->fpu_status);
 378
 379    s390_restore_bfp_rounding_mode(env, old_mode);
 380    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 381    return ret;
 382}
 383
 384/* convert 128-bit float to 32-bit float */
 385uint64_t HELPER(lexb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 386                      uint32_t m34)
 387{
 388    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 389    float32 ret = float128_to_float32(make_float128(ah, al), &env->fpu_status);
 390
 391    s390_restore_bfp_rounding_mode(env, old_mode);
 392    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 393    return ret;
 394}
 395
 396/* 32-bit FP compare */
 397uint32_t HELPER(ceb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 398{
 399    FloatRelation cmp = float32_compare_quiet(f1, f2, &env->fpu_status);
 400    handle_exceptions(env, false, GETPC());
 401    return float_comp_to_cc(env, cmp);
 402}
 403
 404/* 64-bit FP compare */
 405uint32_t HELPER(cdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 406{
 407    FloatRelation cmp = float64_compare_quiet(f1, f2, &env->fpu_status);
 408    handle_exceptions(env, false, GETPC());
 409    return float_comp_to_cc(env, cmp);
 410}
 411
 412/* 128-bit FP compare */
 413uint32_t HELPER(cxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 414                     uint64_t bh, uint64_t bl)
 415{
 416    FloatRelation cmp = float128_compare_quiet(make_float128(ah, al),
 417                                               make_float128(bh, bl),
 418                                               &env->fpu_status);
 419    handle_exceptions(env, false, GETPC());
 420    return float_comp_to_cc(env, cmp);
 421}
 422
 423int s390_swap_bfp_rounding_mode(CPUS390XState *env, int m3)
 424{
 425    int ret = env->fpu_status.float_rounding_mode;
 426
 427    switch (m3) {
 428    case 0:
 429        /* current mode */
 430        break;
 431    case 1:
 432        /* round to nearest with ties away from 0 */
 433        set_float_rounding_mode(float_round_ties_away, &env->fpu_status);
 434        break;
 435    case 3:
 436        /* round to prepare for shorter precision */
 437        set_float_rounding_mode(float_round_to_odd, &env->fpu_status);
 438        break;
 439    case 4:
 440        /* round to nearest with ties to even */
 441        set_float_rounding_mode(float_round_nearest_even, &env->fpu_status);
 442        break;
 443    case 5:
 444        /* round to zero */
 445        set_float_rounding_mode(float_round_to_zero, &env->fpu_status);
 446        break;
 447    case 6:
 448        /* round to +inf */
 449        set_float_rounding_mode(float_round_up, &env->fpu_status);
 450        break;
 451    case 7:
 452        /* round to -inf */
 453        set_float_rounding_mode(float_round_down, &env->fpu_status);
 454        break;
 455    default:
 456        g_assert_not_reached();
 457    }
 458    return ret;
 459}
 460
 461void s390_restore_bfp_rounding_mode(CPUS390XState *env, int old_mode)
 462{
 463    set_float_rounding_mode(old_mode, &env->fpu_status);
 464}
 465
 466/* convert 64-bit int to 32-bit float */
 467uint64_t HELPER(cegb)(CPUS390XState *env, int64_t v2, uint32_t m34)
 468{
 469    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 470    float32 ret = int64_to_float32(v2, &env->fpu_status);
 471
 472    s390_restore_bfp_rounding_mode(env, old_mode);
 473    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 474    return ret;
 475}
 476
 477/* convert 64-bit int to 64-bit float */
 478uint64_t HELPER(cdgb)(CPUS390XState *env, int64_t v2, uint32_t m34)
 479{
 480    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 481    float64 ret = int64_to_float64(v2, &env->fpu_status);
 482
 483    s390_restore_bfp_rounding_mode(env, old_mode);
 484    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 485    return ret;
 486}
 487
 488/* convert 64-bit int to 128-bit float */
 489uint64_t HELPER(cxgb)(CPUS390XState *env, int64_t v2, uint32_t m34)
 490{
 491    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 492    float128 ret = int64_to_float128(v2, &env->fpu_status);
 493
 494    s390_restore_bfp_rounding_mode(env, old_mode);
 495    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 496    return RET128(ret);
 497}
 498
 499/* convert 64-bit uint to 32-bit float */
 500uint64_t HELPER(celgb)(CPUS390XState *env, uint64_t v2, uint32_t m34)
 501{
 502    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 503    float32 ret = uint64_to_float32(v2, &env->fpu_status);
 504
 505    s390_restore_bfp_rounding_mode(env, old_mode);
 506    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 507    return ret;
 508}
 509
 510/* convert 64-bit uint to 64-bit float */
 511uint64_t HELPER(cdlgb)(CPUS390XState *env, uint64_t v2, uint32_t m34)
 512{
 513    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 514    float64 ret = uint64_to_float64(v2, &env->fpu_status);
 515
 516    s390_restore_bfp_rounding_mode(env, old_mode);
 517    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 518    return ret;
 519}
 520
 521/* convert 64-bit uint to 128-bit float */
 522uint64_t HELPER(cxlgb)(CPUS390XState *env, uint64_t v2, uint32_t m34)
 523{
 524    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 525    float128 ret = uint64_to_float128(v2, &env->fpu_status);
 526
 527    s390_restore_bfp_rounding_mode(env, old_mode);
 528    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 529    return RET128(ret);
 530}
 531
 532/* convert 32-bit float to 64-bit int */
 533uint64_t HELPER(cgeb)(CPUS390XState *env, uint64_t v2, uint32_t m34)
 534{
 535    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 536    int64_t ret = float32_to_int64(v2, &env->fpu_status);
 537    uint32_t cc = set_cc_conv_f32(v2, &env->fpu_status);
 538
 539    s390_restore_bfp_rounding_mode(env, old_mode);
 540    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 541    env->cc_op = cc;
 542    if (float32_is_any_nan(v2)) {
 543        return INT64_MIN;
 544    }
 545    return ret;
 546}
 547
 548/* convert 64-bit float to 64-bit int */
 549uint64_t HELPER(cgdb)(CPUS390XState *env, uint64_t v2, uint32_t m34)
 550{
 551    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 552    int64_t ret = float64_to_int64(v2, &env->fpu_status);
 553    uint32_t cc = set_cc_conv_f64(v2, &env->fpu_status);
 554
 555    s390_restore_bfp_rounding_mode(env, old_mode);
 556    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 557    env->cc_op = cc;
 558    if (float64_is_any_nan(v2)) {
 559        return INT64_MIN;
 560    }
 561    return ret;
 562}
 563
 564/* convert 128-bit float to 64-bit int */
 565uint64_t HELPER(cgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m34)
 566{
 567    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 568    float128 v2 = make_float128(h, l);
 569    int64_t ret = float128_to_int64(v2, &env->fpu_status);
 570    uint32_t cc = set_cc_conv_f128(v2, &env->fpu_status);
 571
 572    s390_restore_bfp_rounding_mode(env, old_mode);
 573    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 574    env->cc_op = cc;
 575    if (float128_is_any_nan(v2)) {
 576        return INT64_MIN;
 577    }
 578    return ret;
 579}
 580
 581/* convert 32-bit float to 32-bit int */
 582uint64_t HELPER(cfeb)(CPUS390XState *env, uint64_t v2, uint32_t m34)
 583{
 584    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 585    int32_t ret = float32_to_int32(v2, &env->fpu_status);
 586    uint32_t cc = set_cc_conv_f32(v2, &env->fpu_status);
 587
 588    s390_restore_bfp_rounding_mode(env, old_mode);
 589    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 590    env->cc_op = cc;
 591    if (float32_is_any_nan(v2)) {
 592        return INT32_MIN;
 593    }
 594    return ret;
 595}
 596
 597/* convert 64-bit float to 32-bit int */
 598uint64_t HELPER(cfdb)(CPUS390XState *env, uint64_t v2, uint32_t m34)
 599{
 600    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 601    int32_t ret = float64_to_int32(v2, &env->fpu_status);
 602    uint32_t cc = set_cc_conv_f64(v2, &env->fpu_status);
 603
 604    s390_restore_bfp_rounding_mode(env, old_mode);
 605    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 606    env->cc_op = cc;
 607    if (float64_is_any_nan(v2)) {
 608        return INT32_MIN;
 609    }
 610    return ret;
 611}
 612
 613/* convert 128-bit float to 32-bit int */
 614uint64_t HELPER(cfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m34)
 615{
 616    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 617    float128 v2 = make_float128(h, l);
 618    int32_t ret = float128_to_int32(v2, &env->fpu_status);
 619    uint32_t cc = set_cc_conv_f128(v2, &env->fpu_status);
 620
 621    s390_restore_bfp_rounding_mode(env, old_mode);
 622    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 623    env->cc_op = cc;
 624    if (float128_is_any_nan(v2)) {
 625        return INT32_MIN;
 626    }
 627    return ret;
 628}
 629
 630/* convert 32-bit float to 64-bit uint */
 631uint64_t HELPER(clgeb)(CPUS390XState *env, uint64_t v2, uint32_t m34)
 632{
 633    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 634    uint64_t ret = float32_to_uint64(v2, &env->fpu_status);
 635    uint32_t cc = set_cc_conv_f32(v2, &env->fpu_status);
 636
 637    s390_restore_bfp_rounding_mode(env, old_mode);
 638    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 639    env->cc_op = cc;
 640    if (float32_is_any_nan(v2)) {
 641        return 0;
 642    }
 643    return ret;
 644}
 645
 646/* convert 64-bit float to 64-bit uint */
 647uint64_t HELPER(clgdb)(CPUS390XState *env, uint64_t v2, uint32_t m34)
 648{
 649    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 650    uint64_t ret = float64_to_uint64(v2, &env->fpu_status);
 651    uint32_t cc = set_cc_conv_f64(v2, &env->fpu_status);
 652
 653    s390_restore_bfp_rounding_mode(env, old_mode);
 654    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 655    env->cc_op = cc;
 656    if (float64_is_any_nan(v2)) {
 657        return 0;
 658    }
 659    return ret;
 660}
 661
 662/* convert 128-bit float to 64-bit uint */
 663uint64_t HELPER(clgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m34)
 664{
 665    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 666    float128 v2 = make_float128(h, l);
 667    uint64_t ret = float128_to_uint64(v2, &env->fpu_status);
 668    uint32_t cc = set_cc_conv_f128(v2, &env->fpu_status);
 669
 670    s390_restore_bfp_rounding_mode(env, old_mode);
 671    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 672    env->cc_op = cc;
 673    if (float128_is_any_nan(v2)) {
 674        return 0;
 675    }
 676    return ret;
 677}
 678
 679/* convert 32-bit float to 32-bit uint */
 680uint64_t HELPER(clfeb)(CPUS390XState *env, uint64_t v2, uint32_t m34)
 681{
 682    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 683    uint32_t ret = float32_to_uint32(v2, &env->fpu_status);
 684    uint32_t cc = set_cc_conv_f32(v2, &env->fpu_status);
 685
 686    s390_restore_bfp_rounding_mode(env, old_mode);
 687    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 688    env->cc_op = cc;
 689    if (float32_is_any_nan(v2)) {
 690        return 0;
 691    }
 692    return ret;
 693}
 694
 695/* convert 64-bit float to 32-bit uint */
 696uint64_t HELPER(clfdb)(CPUS390XState *env, uint64_t v2, uint32_t m34)
 697{
 698    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 699    uint32_t ret = float64_to_uint32(v2, &env->fpu_status);
 700    uint32_t cc = set_cc_conv_f64(v2, &env->fpu_status);
 701
 702    s390_restore_bfp_rounding_mode(env, old_mode);
 703    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 704    env->cc_op = cc;
 705    if (float64_is_any_nan(v2)) {
 706        return 0;
 707    }
 708    return ret;
 709}
 710
 711/* convert 128-bit float to 32-bit uint */
 712uint64_t HELPER(clfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m34)
 713{
 714    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 715    float128 v2 = make_float128(h, l);
 716    uint32_t ret = float128_to_uint32(v2, &env->fpu_status);
 717    uint32_t cc = set_cc_conv_f128(v2, &env->fpu_status);
 718
 719    s390_restore_bfp_rounding_mode(env, old_mode);
 720    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 721    env->cc_op = cc;
 722    if (float128_is_any_nan(v2)) {
 723        return 0;
 724    }
 725    return ret;
 726}
 727
 728/* round to integer 32-bit */
 729uint64_t HELPER(fieb)(CPUS390XState *env, uint64_t f2, uint32_t m34)
 730{
 731    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 732    float32 ret = float32_round_to_int(f2, &env->fpu_status);
 733
 734    s390_restore_bfp_rounding_mode(env, old_mode);
 735    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 736    return ret;
 737}
 738
 739/* round to integer 64-bit */
 740uint64_t HELPER(fidb)(CPUS390XState *env, uint64_t f2, uint32_t m34)
 741{
 742    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 743    float64 ret = float64_round_to_int(f2, &env->fpu_status);
 744
 745    s390_restore_bfp_rounding_mode(env, old_mode);
 746    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 747    return ret;
 748}
 749
 750/* round to integer 128-bit */
 751uint64_t HELPER(fixb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 752                      uint32_t m34)
 753{
 754    int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
 755    float128 ret = float128_round_to_int(make_float128(ah, al),
 756                                         &env->fpu_status);
 757
 758    s390_restore_bfp_rounding_mode(env, old_mode);
 759    handle_exceptions(env, xxc_from_m34(m34), GETPC());
 760    return RET128(ret);
 761}
 762
 763/* 32-bit FP compare and signal */
 764uint32_t HELPER(keb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 765{
 766    FloatRelation cmp = float32_compare(f1, f2, &env->fpu_status);
 767    handle_exceptions(env, false, GETPC());
 768    return float_comp_to_cc(env, cmp);
 769}
 770
 771/* 64-bit FP compare and signal */
 772uint32_t HELPER(kdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
 773{
 774    FloatRelation cmp = float64_compare(f1, f2, &env->fpu_status);
 775    handle_exceptions(env, false, GETPC());
 776    return float_comp_to_cc(env, cmp);
 777}
 778
 779/* 128-bit FP compare and signal */
 780uint32_t HELPER(kxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
 781                     uint64_t bh, uint64_t bl)
 782{
 783    FloatRelation cmp = float128_compare(make_float128(ah, al),
 784                                         make_float128(bh, bl),
 785                                         &env->fpu_status);
 786    handle_exceptions(env, false, GETPC());
 787    return float_comp_to_cc(env, cmp);
 788}
 789
 790/* 32-bit FP multiply and add */
 791uint64_t HELPER(maeb)(CPUS390XState *env, uint64_t f1,
 792                      uint64_t f2, uint64_t f3)
 793{
 794    float32 ret = float32_muladd(f2, f3, f1, 0, &env->fpu_status);
 795    handle_exceptions(env, false, GETPC());
 796    return ret;
 797}
 798
 799/* 64-bit FP multiply and add */
 800uint64_t HELPER(madb)(CPUS390XState *env, uint64_t f1,
 801                      uint64_t f2, uint64_t f3)
 802{
 803    float64 ret = float64_muladd(f2, f3, f1, 0, &env->fpu_status);
 804    handle_exceptions(env, false, GETPC());
 805    return ret;
 806}
 807
 808/* 32-bit FP multiply and subtract */
 809uint64_t HELPER(mseb)(CPUS390XState *env, uint64_t f1,
 810                      uint64_t f2, uint64_t f3)
 811{
 812    float32 ret = float32_muladd(f2, f3, f1, float_muladd_negate_c,
 813                                 &env->fpu_status);
 814    handle_exceptions(env, false, GETPC());
 815    return ret;
 816}
 817
 818/* 64-bit FP multiply and subtract */
 819uint64_t HELPER(msdb)(CPUS390XState *env, uint64_t f1,
 820                      uint64_t f2, uint64_t f3)
 821{
 822    float64 ret = float64_muladd(f2, f3, f1, float_muladd_negate_c,
 823                                 &env->fpu_status);
 824    handle_exceptions(env, false, GETPC());
 825    return ret;
 826}
 827
 828/* The rightmost bit has the number 11. */
 829static inline uint16_t dcmask(int bit, bool neg)
 830{
 831    return 1 << (11 - bit - neg);
 832}
 833
 834#define DEF_FLOAT_DCMASK(_TYPE) \
 835uint16_t _TYPE##_dcmask(CPUS390XState *env, _TYPE f1)              \
 836{                                                                  \
 837    const bool neg = _TYPE##_is_neg(f1);                           \
 838                                                                   \
 839    /* Sorted by most common cases - only one class is possible */ \
 840    if (_TYPE##_is_normal(f1)) {                                   \
 841        return dcmask(2, neg);                                     \
 842    } else if (_TYPE##_is_zero(f1)) {                              \
 843        return dcmask(0, neg);                                     \
 844    } else if (_TYPE##_is_denormal(f1)) {                          \
 845        return dcmask(4, neg);                                     \
 846    } else if (_TYPE##_is_infinity(f1)) {                          \
 847        return dcmask(6, neg);                                     \
 848    } else if (_TYPE##_is_quiet_nan(f1, &env->fpu_status)) {       \
 849        return dcmask(8, neg);                                     \
 850    }                                                              \
 851    /* signaling nan, as last remaining case */                    \
 852    return dcmask(10, neg);                                        \
 853}
 854DEF_FLOAT_DCMASK(float32)
 855DEF_FLOAT_DCMASK(float64)
 856DEF_FLOAT_DCMASK(float128)
 857
 858/* test data class 32-bit */
 859uint32_t HELPER(tceb)(CPUS390XState *env, uint64_t f1, uint64_t m2)
 860{
 861    return (m2 & float32_dcmask(env, f1)) != 0;
 862}
 863
 864/* test data class 64-bit */
 865uint32_t HELPER(tcdb)(CPUS390XState *env, uint64_t v1, uint64_t m2)
 866{
 867    return (m2 & float64_dcmask(env, v1)) != 0;
 868}
 869
 870/* test data class 128-bit */
 871uint32_t HELPER(tcxb)(CPUS390XState *env, uint64_t ah, uint64_t al, uint64_t m2)
 872{
 873    return (m2 & float128_dcmask(env, make_float128(ah, al))) != 0;
 874}
 875
 876/* square root 32-bit */
 877uint64_t HELPER(sqeb)(CPUS390XState *env, uint64_t f2)
 878{
 879    float32 ret = float32_sqrt(f2, &env->fpu_status);
 880    handle_exceptions(env, false, GETPC());
 881    return ret;
 882}
 883
 884/* square root 64-bit */
 885uint64_t HELPER(sqdb)(CPUS390XState *env, uint64_t f2)
 886{
 887    float64 ret = float64_sqrt(f2, &env->fpu_status);
 888    handle_exceptions(env, false, GETPC());
 889    return ret;
 890}
 891
 892/* square root 128-bit */
 893uint64_t HELPER(sqxb)(CPUS390XState *env, uint64_t ah, uint64_t al)
 894{
 895    float128 ret = float128_sqrt(make_float128(ah, al), &env->fpu_status);
 896    handle_exceptions(env, false, GETPC());
 897    return RET128(ret);
 898}
 899
 900static const int fpc_to_rnd[8] = {
 901    float_round_nearest_even,
 902    float_round_to_zero,
 903    float_round_up,
 904    float_round_down,
 905    -1,
 906    -1,
 907    -1,
 908    float_round_to_odd,
 909};
 910
 911/* set fpc */
 912void HELPER(sfpc)(CPUS390XState *env, uint64_t fpc)
 913{
 914    if (fpc_to_rnd[fpc & 0x7] == -1 || fpc & 0x03030088u ||
 915        (!s390_has_feat(S390_FEAT_FLOATING_POINT_EXT) && fpc & 0x4)) {
 916        tcg_s390_program_interrupt(env, PGM_SPECIFICATION, GETPC());
 917    }
 918
 919    /* Install everything in the main FPC.  */
 920    env->fpc = fpc;
 921
 922    /* Install the rounding mode in the shadow fpu_status.  */
 923    set_float_rounding_mode(fpc_to_rnd[fpc & 0x7], &env->fpu_status);
 924}
 925
 926/* set fpc and signal */
 927void HELPER(sfas)(CPUS390XState *env, uint64_t fpc)
 928{
 929    uint32_t signalling = env->fpc;
 930    uint32_t s390_exc;
 931
 932    if (fpc_to_rnd[fpc & 0x7] == -1 || fpc & 0x03030088u ||
 933        (!s390_has_feat(S390_FEAT_FLOATING_POINT_EXT) && fpc & 0x4)) {
 934        tcg_s390_program_interrupt(env, PGM_SPECIFICATION, GETPC());
 935    }
 936
 937    /*
 938     * FPC is set to the FPC operand with a bitwise OR of the signalling
 939     * flags.
 940     */
 941    env->fpc = fpc | (signalling & 0x00ff0000);
 942    set_float_rounding_mode(fpc_to_rnd[fpc & 0x7], &env->fpu_status);
 943
 944    /*
 945     * If any signaling flag is enabled in the new FPC mask, a
 946     * simulated-iee-exception exception occurs.
 947     */
 948    s390_exc = (signalling >> 16) & (fpc >> 24);
 949    if (s390_exc) {
 950        if (s390_exc & S390_IEEE_MASK_INVALID) {
 951            s390_exc = S390_IEEE_MASK_INVALID;
 952        } else if (s390_exc & S390_IEEE_MASK_DIVBYZERO) {
 953            s390_exc = S390_IEEE_MASK_DIVBYZERO;
 954        } else if (s390_exc & S390_IEEE_MASK_OVERFLOW) {
 955            s390_exc &= (S390_IEEE_MASK_OVERFLOW | S390_IEEE_MASK_INEXACT);
 956        } else if (s390_exc & S390_IEEE_MASK_UNDERFLOW) {
 957            s390_exc &= (S390_IEEE_MASK_UNDERFLOW | S390_IEEE_MASK_INEXACT);
 958        } else if (s390_exc & S390_IEEE_MASK_INEXACT) {
 959            s390_exc = S390_IEEE_MASK_INEXACT;
 960        } else if (s390_exc & S390_IEEE_MASK_QUANTUM) {
 961            s390_exc = S390_IEEE_MASK_QUANTUM;
 962        }
 963        tcg_s390_data_exception(env, s390_exc | 3, GETPC());
 964    }
 965}
 966
 967/* set bfp rounding mode */
 968void HELPER(srnm)(CPUS390XState *env, uint64_t rnd)
 969{
 970    if (rnd > 0x7 || fpc_to_rnd[rnd & 0x7] == -1) {
 971        tcg_s390_program_interrupt(env, PGM_SPECIFICATION, GETPC());
 972    }
 973
 974    env->fpc = deposit32(env->fpc, 0, 3, rnd);
 975    set_float_rounding_mode(fpc_to_rnd[rnd & 0x7], &env->fpu_status);
 976}
 977