diff options
Diffstat (limited to 'target/s390x/tcg/fpu_helper.c')
| -rw-r--r-- | target/s390x/tcg/fpu_helper.c | 976 |
1 files changed, 976 insertions, 0 deletions
diff --git a/target/s390x/tcg/fpu_helper.c b/target/s390x/tcg/fpu_helper.c new file mode 100644 index 0000000000..4067205405 --- /dev/null +++ b/target/s390x/tcg/fpu_helper.c @@ -0,0 +1,976 @@ +/* + * S/390 FPU helper routines + * + * Copyright (c) 2009 Ulrich Hecht + * Copyright (c) 2009 Alexander Graf + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "qemu/osdep.h" +#include "cpu.h" +#include "s390x-internal.h" +#include "tcg_s390x.h" +#include "exec/exec-all.h" +#include "exec/cpu_ldst.h" +#include "exec/helper-proto.h" +#include "fpu/softfloat.h" + +/* #define DEBUG_HELPER */ +#ifdef DEBUG_HELPER +#define HELPER_LOG(x...) qemu_log(x) +#else +#define HELPER_LOG(x...) +#endif + +#define RET128(F) (env->retxl = F.low, F.high) + +uint8_t s390_softfloat_exc_to_ieee(unsigned int exc) +{ + uint8_t s390_exc = 0; + + s390_exc |= (exc & float_flag_invalid) ? S390_IEEE_MASK_INVALID : 0; + s390_exc |= (exc & float_flag_divbyzero) ? S390_IEEE_MASK_DIVBYZERO : 0; + s390_exc |= (exc & float_flag_overflow) ? S390_IEEE_MASK_OVERFLOW : 0; + s390_exc |= (exc & float_flag_underflow) ? S390_IEEE_MASK_UNDERFLOW : 0; + s390_exc |= (exc & float_flag_inexact) ? S390_IEEE_MASK_INEXACT : 0; + + return s390_exc; +} + +/* Should be called after any operation that may raise IEEE exceptions. */ +static void handle_exceptions(CPUS390XState *env, bool XxC, uintptr_t retaddr) +{ + unsigned s390_exc, qemu_exc; + + /* Get the exceptions raised by the current operation. Reset the + fpu_status contents so that the next operation has a clean slate. */ + qemu_exc = env->fpu_status.float_exception_flags; + if (qemu_exc == 0) { + return; + } + env->fpu_status.float_exception_flags = 0; + s390_exc = s390_softfloat_exc_to_ieee(qemu_exc); + + /* + * IEEE-Underflow exception recognition exists if a tininess condition + * (underflow) exists and + * - The mask bit in the FPC is zero and the result is inexact + * - The mask bit in the FPC is one + * So tininess conditions that are not inexact don't trigger any + * underflow action in case the mask bit is not one. + */ + if (!(s390_exc & S390_IEEE_MASK_INEXACT) && + !((env->fpc >> 24) & S390_IEEE_MASK_UNDERFLOW)) { + s390_exc &= ~S390_IEEE_MASK_UNDERFLOW; + } + + /* + * FIXME: + * 1. Right now, all inexact conditions are inidicated as + * "truncated" (0) and never as "incremented" (1) in the DXC. + * 2. Only traps due to invalid/divbyzero are suppressing. Other traps + * are completing, meaning the target register has to be written! + * This, however will mean that we have to write the register before + * triggering the trap - impossible right now. + */ + + /* + * invalid/divbyzero cannot coexist with other conditions. + * overflow/underflow however can coexist with inexact, we have to + * handle it separatly. + */ + if (s390_exc & ~S390_IEEE_MASK_INEXACT) { + if (s390_exc & ~S390_IEEE_MASK_INEXACT & env->fpc >> 24) { + /* trap condition - inexact reported along */ + tcg_s390_data_exception(env, s390_exc, retaddr); + } + /* nontrap condition - inexact handled differently */ + env->fpc |= (s390_exc & ~S390_IEEE_MASK_INEXACT) << 16; + } + + /* inexact handling */ + if (s390_exc & S390_IEEE_MASK_INEXACT && !XxC) { + /* trap condition - overflow/underflow _not_ reported along */ + if (s390_exc & S390_IEEE_MASK_INEXACT & env->fpc >> 24) { + tcg_s390_data_exception(env, s390_exc & S390_IEEE_MASK_INEXACT, + retaddr); + } + /* nontrap condition */ + env->fpc |= (s390_exc & S390_IEEE_MASK_INEXACT) << 16; + } +} + +int float_comp_to_cc(CPUS390XState *env, FloatRelation float_compare) +{ + switch (float_compare) { + case float_relation_equal: + return 0; + case float_relation_less: + return 1; + case float_relation_greater: + return 2; + case float_relation_unordered: + return 3; + default: + cpu_abort(env_cpu(env), "unknown return value for float compare\n"); + } +} + +/* condition codes for unary FP ops */ +uint32_t set_cc_nz_f32(float32 v) +{ + if (float32_is_any_nan(v)) { + return 3; + } else if (float32_is_zero(v)) { + return 0; + } else if (float32_is_neg(v)) { + return 1; + } else { + return 2; + } +} + +uint32_t set_cc_nz_f64(float64 v) +{ + if (float64_is_any_nan(v)) { + return 3; + } else if (float64_is_zero(v)) { + return 0; + } else if (float64_is_neg(v)) { + return 1; + } else { + return 2; + } +} + +uint32_t set_cc_nz_f128(float128 v) +{ + if (float128_is_any_nan(v)) { + return 3; + } else if (float128_is_zero(v)) { + return 0; + } else if (float128_is_neg(v)) { + return 1; + } else { + return 2; + } +} + +/* condition codes for FP to integer conversion ops */ +static uint32_t set_cc_conv_f32(float32 v, float_status *stat) +{ + if (stat->float_exception_flags & float_flag_invalid) { + return 3; + } else { + return set_cc_nz_f32(v); + } +} + +static uint32_t set_cc_conv_f64(float64 v, float_status *stat) +{ + if (stat->float_exception_flags & float_flag_invalid) { + return 3; + } else { + return set_cc_nz_f64(v); + } +} + +static uint32_t set_cc_conv_f128(float128 v, float_status *stat) +{ + if (stat->float_exception_flags & float_flag_invalid) { + return 3; + } else { + return set_cc_nz_f128(v); + } +} + +static inline uint8_t round_from_m34(uint32_t m34) +{ + return extract32(m34, 0, 4); +} + +static inline bool xxc_from_m34(uint32_t m34) +{ + /* XxC is bit 1 of m4 */ + return extract32(m34, 4 + 3 - 1, 1); +} + +/* 32-bit FP addition */ +uint64_t HELPER(aeb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + float32 ret = float32_add(f1, f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* 64-bit FP addition */ +uint64_t HELPER(adb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + float64 ret = float64_add(f1, f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* 128-bit FP addition */ +uint64_t HELPER(axb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint64_t bh, uint64_t bl) +{ + float128 ret = float128_add(make_float128(ah, al), + make_float128(bh, bl), + &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return RET128(ret); +} + +/* 32-bit FP subtraction */ +uint64_t HELPER(seb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + float32 ret = float32_sub(f1, f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* 64-bit FP subtraction */ +uint64_t HELPER(sdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + float64 ret = float64_sub(f1, f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* 128-bit FP subtraction */ +uint64_t HELPER(sxb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint64_t bh, uint64_t bl) +{ + float128 ret = float128_sub(make_float128(ah, al), + make_float128(bh, bl), + &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return RET128(ret); +} + +/* 32-bit FP division */ +uint64_t HELPER(deb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + float32 ret = float32_div(f1, f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* 64-bit FP division */ +uint64_t HELPER(ddb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + float64 ret = float64_div(f1, f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* 128-bit FP division */ +uint64_t HELPER(dxb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint64_t bh, uint64_t bl) +{ + float128 ret = float128_div(make_float128(ah, al), + make_float128(bh, bl), + &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return RET128(ret); +} + +/* 32-bit FP multiplication */ +uint64_t HELPER(meeb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + float32 ret = float32_mul(f1, f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* 64-bit FP multiplication */ +uint64_t HELPER(mdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + float64 ret = float64_mul(f1, f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* 64/32-bit FP multiplication */ +uint64_t HELPER(mdeb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + float64 ret = float32_to_float64(f2, &env->fpu_status); + ret = float64_mul(f1, ret, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* 128-bit FP multiplication */ +uint64_t HELPER(mxb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint64_t bh, uint64_t bl) +{ + float128 ret = float128_mul(make_float128(ah, al), + make_float128(bh, bl), + &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return RET128(ret); +} + +/* 128/64-bit FP multiplication */ +uint64_t HELPER(mxdb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint64_t f2) +{ + float128 ret = float64_to_float128(f2, &env->fpu_status); + ret = float128_mul(make_float128(ah, al), ret, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return RET128(ret); +} + +/* convert 32-bit float to 64-bit float */ +uint64_t HELPER(ldeb)(CPUS390XState *env, uint64_t f2) +{ + float64 ret = float32_to_float64(f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* convert 128-bit float to 64-bit float */ +uint64_t HELPER(ldxb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float64 ret = float128_to_float64(make_float128(ah, al), &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + return ret; +} + +/* convert 64-bit float to 128-bit float */ +uint64_t HELPER(lxdb)(CPUS390XState *env, uint64_t f2) +{ + float128 ret = float64_to_float128(f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return RET128(ret); +} + +/* convert 32-bit float to 128-bit float */ +uint64_t HELPER(lxeb)(CPUS390XState *env, uint64_t f2) +{ + float128 ret = float32_to_float128(f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return RET128(ret); +} + +/* convert 64-bit float to 32-bit float */ +uint64_t HELPER(ledb)(CPUS390XState *env, uint64_t f2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float32 ret = float64_to_float32(f2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + return ret; +} + +/* convert 128-bit float to 32-bit float */ +uint64_t HELPER(lexb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float32 ret = float128_to_float32(make_float128(ah, al), &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + return ret; +} + +/* 32-bit FP compare */ +uint32_t HELPER(ceb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + FloatRelation cmp = float32_compare_quiet(f1, f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return float_comp_to_cc(env, cmp); +} + +/* 64-bit FP compare */ +uint32_t HELPER(cdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + FloatRelation cmp = float64_compare_quiet(f1, f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return float_comp_to_cc(env, cmp); +} + +/* 128-bit FP compare */ +uint32_t HELPER(cxb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint64_t bh, uint64_t bl) +{ + FloatRelation cmp = float128_compare_quiet(make_float128(ah, al), + make_float128(bh, bl), + &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return float_comp_to_cc(env, cmp); +} + +int s390_swap_bfp_rounding_mode(CPUS390XState *env, int m3) +{ + int ret = env->fpu_status.float_rounding_mode; + + switch (m3) { + case 0: + /* current mode */ + break; + case 1: + /* round to nearest with ties away from 0 */ + set_float_rounding_mode(float_round_ties_away, &env->fpu_status); + break; + case 3: + /* round to prepare for shorter precision */ + set_float_rounding_mode(float_round_to_odd, &env->fpu_status); + break; + case 4: + /* round to nearest with ties to even */ + set_float_rounding_mode(float_round_nearest_even, &env->fpu_status); + break; + case 5: + /* round to zero */ + set_float_rounding_mode(float_round_to_zero, &env->fpu_status); + break; + case 6: + /* round to +inf */ + set_float_rounding_mode(float_round_up, &env->fpu_status); + break; + case 7: + /* round to -inf */ + set_float_rounding_mode(float_round_down, &env->fpu_status); + break; + default: + g_assert_not_reached(); + } + return ret; +} + +void s390_restore_bfp_rounding_mode(CPUS390XState *env, int old_mode) +{ + set_float_rounding_mode(old_mode, &env->fpu_status); +} + +/* convert 64-bit int to 32-bit float */ +uint64_t HELPER(cegb)(CPUS390XState *env, int64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float32 ret = int64_to_float32(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + return ret; +} + +/* convert 64-bit int to 64-bit float */ +uint64_t HELPER(cdgb)(CPUS390XState *env, int64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float64 ret = int64_to_float64(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + return ret; +} + +/* convert 64-bit int to 128-bit float */ +uint64_t HELPER(cxgb)(CPUS390XState *env, int64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float128 ret = int64_to_float128(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + return RET128(ret); +} + +/* convert 64-bit uint to 32-bit float */ +uint64_t HELPER(celgb)(CPUS390XState *env, uint64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float32 ret = uint64_to_float32(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + return ret; +} + +/* convert 64-bit uint to 64-bit float */ +uint64_t HELPER(cdlgb)(CPUS390XState *env, uint64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float64 ret = uint64_to_float64(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + return ret; +} + +/* convert 64-bit uint to 128-bit float */ +uint64_t HELPER(cxlgb)(CPUS390XState *env, uint64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float128 ret = uint64_to_float128(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + return RET128(ret); +} + +/* convert 32-bit float to 64-bit int */ +uint64_t HELPER(cgeb)(CPUS390XState *env, uint64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + int64_t ret = float32_to_int64(v2, &env->fpu_status); + uint32_t cc = set_cc_conv_f32(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + env->cc_op = cc; + if (float32_is_any_nan(v2)) { + return INT64_MIN; + } + return ret; +} + +/* convert 64-bit float to 64-bit int */ +uint64_t HELPER(cgdb)(CPUS390XState *env, uint64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + int64_t ret = float64_to_int64(v2, &env->fpu_status); + uint32_t cc = set_cc_conv_f64(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + env->cc_op = cc; + if (float64_is_any_nan(v2)) { + return INT64_MIN; + } + return ret; +} + +/* convert 128-bit float to 64-bit int */ +uint64_t HELPER(cgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float128 v2 = make_float128(h, l); + int64_t ret = float128_to_int64(v2, &env->fpu_status); + uint32_t cc = set_cc_conv_f128(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + env->cc_op = cc; + if (float128_is_any_nan(v2)) { + return INT64_MIN; + } + return ret; +} + +/* convert 32-bit float to 32-bit int */ +uint64_t HELPER(cfeb)(CPUS390XState *env, uint64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + int32_t ret = float32_to_int32(v2, &env->fpu_status); + uint32_t cc = set_cc_conv_f32(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + env->cc_op = cc; + if (float32_is_any_nan(v2)) { + return INT32_MIN; + } + return ret; +} + +/* convert 64-bit float to 32-bit int */ +uint64_t HELPER(cfdb)(CPUS390XState *env, uint64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + int32_t ret = float64_to_int32(v2, &env->fpu_status); + uint32_t cc = set_cc_conv_f64(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + env->cc_op = cc; + if (float64_is_any_nan(v2)) { + return INT32_MIN; + } + return ret; +} + +/* convert 128-bit float to 32-bit int */ +uint64_t HELPER(cfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float128 v2 = make_float128(h, l); + int32_t ret = float128_to_int32(v2, &env->fpu_status); + uint32_t cc = set_cc_conv_f128(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + env->cc_op = cc; + if (float128_is_any_nan(v2)) { + return INT32_MIN; + } + return ret; +} + +/* convert 32-bit float to 64-bit uint */ +uint64_t HELPER(clgeb)(CPUS390XState *env, uint64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + uint64_t ret = float32_to_uint64(v2, &env->fpu_status); + uint32_t cc = set_cc_conv_f32(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + env->cc_op = cc; + if (float32_is_any_nan(v2)) { + return 0; + } + return ret; +} + +/* convert 64-bit float to 64-bit uint */ +uint64_t HELPER(clgdb)(CPUS390XState *env, uint64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + uint64_t ret = float64_to_uint64(v2, &env->fpu_status); + uint32_t cc = set_cc_conv_f64(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + env->cc_op = cc; + if (float64_is_any_nan(v2)) { + return 0; + } + return ret; +} + +/* convert 128-bit float to 64-bit uint */ +uint64_t HELPER(clgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float128 v2 = make_float128(h, l); + uint64_t ret = float128_to_uint64(v2, &env->fpu_status); + uint32_t cc = set_cc_conv_f128(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + env->cc_op = cc; + if (float128_is_any_nan(v2)) { + return 0; + } + return ret; +} + +/* convert 32-bit float to 32-bit uint */ +uint64_t HELPER(clfeb)(CPUS390XState *env, uint64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + uint32_t ret = float32_to_uint32(v2, &env->fpu_status); + uint32_t cc = set_cc_conv_f32(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + env->cc_op = cc; + if (float32_is_any_nan(v2)) { + return 0; + } + return ret; +} + +/* convert 64-bit float to 32-bit uint */ +uint64_t HELPER(clfdb)(CPUS390XState *env, uint64_t v2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + uint32_t ret = float64_to_uint32(v2, &env->fpu_status); + uint32_t cc = set_cc_conv_f64(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + env->cc_op = cc; + if (float64_is_any_nan(v2)) { + return 0; + } + return ret; +} + +/* convert 128-bit float to 32-bit uint */ +uint64_t HELPER(clfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float128 v2 = make_float128(h, l); + uint32_t ret = float128_to_uint32(v2, &env->fpu_status); + uint32_t cc = set_cc_conv_f128(v2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + env->cc_op = cc; + if (float128_is_any_nan(v2)) { + return 0; + } + return ret; +} + +/* round to integer 32-bit */ +uint64_t HELPER(fieb)(CPUS390XState *env, uint64_t f2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float32 ret = float32_round_to_int(f2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + return ret; +} + +/* round to integer 64-bit */ +uint64_t HELPER(fidb)(CPUS390XState *env, uint64_t f2, uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float64 ret = float64_round_to_int(f2, &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + return ret; +} + +/* round to integer 128-bit */ +uint64_t HELPER(fixb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint32_t m34) +{ + int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34)); + float128 ret = float128_round_to_int(make_float128(ah, al), + &env->fpu_status); + + s390_restore_bfp_rounding_mode(env, old_mode); + handle_exceptions(env, xxc_from_m34(m34), GETPC()); + return RET128(ret); +} + +/* 32-bit FP compare and signal */ +uint32_t HELPER(keb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + FloatRelation cmp = float32_compare(f1, f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return float_comp_to_cc(env, cmp); +} + +/* 64-bit FP compare and signal */ +uint32_t HELPER(kdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + FloatRelation cmp = float64_compare(f1, f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return float_comp_to_cc(env, cmp); +} + +/* 128-bit FP compare and signal */ +uint32_t HELPER(kxb)(CPUS390XState *env, uint64_t ah, uint64_t al, + uint64_t bh, uint64_t bl) +{ + FloatRelation cmp = float128_compare(make_float128(ah, al), + make_float128(bh, bl), + &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return float_comp_to_cc(env, cmp); +} + +/* 32-bit FP multiply and add */ +uint64_t HELPER(maeb)(CPUS390XState *env, uint64_t f1, + uint64_t f2, uint64_t f3) +{ + float32 ret = float32_muladd(f2, f3, f1, 0, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* 64-bit FP multiply and add */ +uint64_t HELPER(madb)(CPUS390XState *env, uint64_t f1, + uint64_t f2, uint64_t f3) +{ + float64 ret = float64_muladd(f2, f3, f1, 0, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* 32-bit FP multiply and subtract */ +uint64_t HELPER(mseb)(CPUS390XState *env, uint64_t f1, + uint64_t f2, uint64_t f3) +{ + float32 ret = float32_muladd(f2, f3, f1, float_muladd_negate_c, + &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* 64-bit FP multiply and subtract */ +uint64_t HELPER(msdb)(CPUS390XState *env, uint64_t f1, + uint64_t f2, uint64_t f3) +{ + float64 ret = float64_muladd(f2, f3, f1, float_muladd_negate_c, + &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* The rightmost bit has the number 11. */ +static inline uint16_t dcmask(int bit, bool neg) +{ + return 1 << (11 - bit - neg); +} + +#define DEF_FLOAT_DCMASK(_TYPE) \ +uint16_t _TYPE##_dcmask(CPUS390XState *env, _TYPE f1) \ +{ \ + const bool neg = _TYPE##_is_neg(f1); \ + \ + /* Sorted by most common cases - only one class is possible */ \ + if (_TYPE##_is_normal(f1)) { \ + return dcmask(2, neg); \ + } else if (_TYPE##_is_zero(f1)) { \ + return dcmask(0, neg); \ + } else if (_TYPE##_is_denormal(f1)) { \ + return dcmask(4, neg); \ + } else if (_TYPE##_is_infinity(f1)) { \ + return dcmask(6, neg); \ + } else if (_TYPE##_is_quiet_nan(f1, &env->fpu_status)) { \ + return dcmask(8, neg); \ + } \ + /* signaling nan, as last remaining case */ \ + return dcmask(10, neg); \ +} +DEF_FLOAT_DCMASK(float32) +DEF_FLOAT_DCMASK(float64) +DEF_FLOAT_DCMASK(float128) + +/* test data class 32-bit */ +uint32_t HELPER(tceb)(CPUS390XState *env, uint64_t f1, uint64_t m2) +{ + return (m2 & float32_dcmask(env, f1)) != 0; +} + +/* test data class 64-bit */ +uint32_t HELPER(tcdb)(CPUS390XState *env, uint64_t v1, uint64_t m2) +{ + return (m2 & float64_dcmask(env, v1)) != 0; +} + +/* test data class 128-bit */ +uint32_t HELPER(tcxb)(CPUS390XState *env, uint64_t ah, uint64_t al, uint64_t m2) +{ + return (m2 & float128_dcmask(env, make_float128(ah, al))) != 0; +} + +/* square root 32-bit */ +uint64_t HELPER(sqeb)(CPUS390XState *env, uint64_t f2) +{ + float32 ret = float32_sqrt(f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* square root 64-bit */ +uint64_t HELPER(sqdb)(CPUS390XState *env, uint64_t f2) +{ + float64 ret = float64_sqrt(f2, &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return ret; +} + +/* square root 128-bit */ +uint64_t HELPER(sqxb)(CPUS390XState *env, uint64_t ah, uint64_t al) +{ + float128 ret = float128_sqrt(make_float128(ah, al), &env->fpu_status); + handle_exceptions(env, false, GETPC()); + return RET128(ret); +} + +static const int fpc_to_rnd[8] = { + float_round_nearest_even, + float_round_to_zero, + float_round_up, + float_round_down, + -1, + -1, + -1, + float_round_to_odd, +}; + +/* set fpc */ +void HELPER(sfpc)(CPUS390XState *env, uint64_t fpc) +{ + if (fpc_to_rnd[fpc & 0x7] == -1 || fpc & 0x03030088u || + (!s390_has_feat(S390_FEAT_FLOATING_POINT_EXT) && fpc & 0x4)) { + tcg_s390_program_interrupt(env, PGM_SPECIFICATION, GETPC()); + } + + /* Install everything in the main FPC. */ + env->fpc = fpc; + + /* Install the rounding mode in the shadow fpu_status. */ + set_float_rounding_mode(fpc_to_rnd[fpc & 0x7], &env->fpu_status); +} + +/* set fpc and signal */ +void HELPER(sfas)(CPUS390XState *env, uint64_t fpc) +{ + uint32_t signalling = env->fpc; + uint32_t s390_exc; + + if (fpc_to_rnd[fpc & 0x7] == -1 || fpc & 0x03030088u || + (!s390_has_feat(S390_FEAT_FLOATING_POINT_EXT) && fpc & 0x4)) { + tcg_s390_program_interrupt(env, PGM_SPECIFICATION, GETPC()); + } + + /* + * FPC is set to the FPC operand with a bitwise OR of the signalling + * flags. + */ + env->fpc = fpc | (signalling & 0x00ff0000); + set_float_rounding_mode(fpc_to_rnd[fpc & 0x7], &env->fpu_status); + + /* + * If any signaling flag is enabled in the new FPC mask, a + * simulated-iee-exception exception occurs. + */ + s390_exc = (signalling >> 16) & (fpc >> 24); + if (s390_exc) { + if (s390_exc & S390_IEEE_MASK_INVALID) { + s390_exc = S390_IEEE_MASK_INVALID; + } else if (s390_exc & S390_IEEE_MASK_DIVBYZERO) { + s390_exc = S390_IEEE_MASK_DIVBYZERO; + } else if (s390_exc & S390_IEEE_MASK_OVERFLOW) { + s390_exc &= (S390_IEEE_MASK_OVERFLOW | S390_IEEE_MASK_INEXACT); + } else if (s390_exc & S390_IEEE_MASK_UNDERFLOW) { + s390_exc &= (S390_IEEE_MASK_UNDERFLOW | S390_IEEE_MASK_INEXACT); + } else if (s390_exc & S390_IEEE_MASK_INEXACT) { + s390_exc = S390_IEEE_MASK_INEXACT; + } else if (s390_exc & S390_IEEE_MASK_QUANTUM) { + s390_exc = S390_IEEE_MASK_QUANTUM; + } + tcg_s390_data_exception(env, s390_exc | 3, GETPC()); + } +} + +/* set bfp rounding mode */ +void HELPER(srnm)(CPUS390XState *env, uint64_t rnd) +{ + if (rnd > 0x7 || fpc_to_rnd[rnd & 0x7] == -1) { + tcg_s390_program_interrupt(env, PGM_SPECIFICATION, GETPC()); + } + + env->fpc = deposit32(env->fpc, 0, 3, rnd); + set_float_rounding_mode(fpc_to_rnd[rnd & 0x7], &env->fpu_status); +} |