diff options
Diffstat (limited to 'target/s390x/fpu_helper.c')
| -rw-r--r-- | target/s390x/fpu_helper.c | 749 |
1 files changed, 749 insertions, 0 deletions
diff --git a/target/s390x/fpu_helper.c b/target/s390x/fpu_helper.c new file mode 100644 index 0000000000..e604e9f7be --- /dev/null +++ b/target/s390x/fpu_helper.c @@ -0,0 +1,749 @@ +/* + * 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 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 "exec/exec-all.h" +#include "exec/cpu_ldst.h" +#include "exec/helper-proto.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) + +#define convert_bit(mask, from, to) \ + (to < from \ + ? (mask / (from / to)) & to \ + : (mask & from) * (to / from)) + +static void ieee_exception(CPUS390XState *env, uint32_t dxc, uintptr_t retaddr) +{ + /* Install the DXC code. */ + env->fpc = (env->fpc & ~0xff00) | (dxc << 8); + /* Trap. */ + runtime_exception(env, PGM_DATA, retaddr); +} + +/* Should be called after any operation that may raise IEEE exceptions. */ +static void handle_exceptions(CPUS390XState *env, 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; + + /* Convert softfloat exception bits to s390 exception bits. */ + s390_exc = 0; + s390_exc |= convert_bit(qemu_exc, float_flag_invalid, 0x80); + s390_exc |= convert_bit(qemu_exc, float_flag_divbyzero, 0x40); + s390_exc |= convert_bit(qemu_exc, float_flag_overflow, 0x20); + s390_exc |= convert_bit(qemu_exc, float_flag_underflow, 0x10); + s390_exc |= convert_bit(qemu_exc, float_flag_inexact, 0x08); + + /* Install the exceptions that we raised. */ + env->fpc |= s390_exc << 16; + + /* Send signals for enabled exceptions. */ + s390_exc &= env->fpc >> 24; + if (s390_exc) { + ieee_exception(env, s390_exc, retaddr); + } +} + +static inline int float_comp_to_cc(CPUS390XState *env, int float_compare) +{ + S390CPU *cpu = s390_env_get_cpu(env); + + 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(CPU(cpu), "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; + } +} + +/* 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, GETPC()); + return float64_maybe_silence_nan(ret, &env->fpu_status); +} + +/* convert 128-bit float to 64-bit float */ +uint64_t HELPER(ldxb)(CPUS390XState *env, uint64_t ah, uint64_t al) +{ + float64 ret = float128_to_float64(make_float128(ah, al), &env->fpu_status); + handle_exceptions(env, GETPC()); + return float64_maybe_silence_nan(ret, &env->fpu_status); +} + +/* 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, GETPC()); + return RET128(float128_maybe_silence_nan(ret, &env->fpu_status)); +} + +/* 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, GETPC()); + return RET128(float128_maybe_silence_nan(ret, &env->fpu_status)); +} + +/* convert 64-bit float to 32-bit float */ +uint64_t HELPER(ledb)(CPUS390XState *env, uint64_t f2) +{ + float32 ret = float64_to_float32(f2, &env->fpu_status); + handle_exceptions(env, GETPC()); + return float32_maybe_silence_nan(ret, &env->fpu_status); +} + +/* convert 128-bit float to 32-bit float */ +uint64_t HELPER(lexb)(CPUS390XState *env, uint64_t ah, uint64_t al) +{ + float32 ret = float128_to_float32(make_float128(ah, al), &env->fpu_status); + handle_exceptions(env, GETPC()); + return float32_maybe_silence_nan(ret, &env->fpu_status); +} + +/* 32-bit FP compare */ +uint32_t HELPER(ceb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + int cmp = float32_compare_quiet(f1, f2, &env->fpu_status); + handle_exceptions(env, GETPC()); + return float_comp_to_cc(env, cmp); +} + +/* 64-bit FP compare */ +uint32_t HELPER(cdb)(CPUS390XState *env, uint64_t f1, uint64_t f2) +{ + int cmp = float64_compare_quiet(f1, f2, &env->fpu_status); + handle_exceptions(env, 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) +{ + int cmp = float128_compare_quiet(make_float128(ah, al), + make_float128(bh, bl), + &env->fpu_status); + handle_exceptions(env, GETPC()); + return float_comp_to_cc(env, cmp); +} + +static int swap_round_mode(CPUS390XState *env, int m3) +{ + int ret = env->fpu_status.float_rounding_mode; + switch (m3) { + case 0: + /* current mode */ + break; + case 1: + /* biased round no nearest */ + case 4: + /* round to nearest */ + 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; + } + return ret; +} + +/* convert 64-bit int to 32-bit float */ +uint64_t HELPER(cegb)(CPUS390XState *env, int64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float32 ret = int64_to_float32(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 64-bit int to 64-bit float */ +uint64_t HELPER(cdgb)(CPUS390XState *env, int64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float64 ret = int64_to_float64(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 64-bit int to 128-bit float */ +uint64_t HELPER(cxgb)(CPUS390XState *env, int64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float128 ret = int64_to_float128(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return RET128(ret); +} + +/* convert 64-bit uint to 32-bit float */ +uint64_t HELPER(celgb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float32 ret = uint64_to_float32(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 64-bit uint to 64-bit float */ +uint64_t HELPER(cdlgb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float64 ret = uint64_to_float64(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 64-bit uint to 128-bit float */ +uint64_t HELPER(cxlgb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float128 ret = uint64_to_float128(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return RET128(ret); +} + +/* convert 32-bit float to 64-bit int */ +uint64_t HELPER(cgeb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + int64_t ret = float32_to_int64(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 64-bit float to 64-bit int */ +uint64_t HELPER(cgdb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + int64_t ret = float64_to_int64(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 128-bit float to 64-bit int */ +uint64_t HELPER(cgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float128 v2 = make_float128(h, l); + int64_t ret = float128_to_int64(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 32-bit float to 32-bit int */ +uint64_t HELPER(cfeb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + int32_t ret = float32_to_int32(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 64-bit float to 32-bit int */ +uint64_t HELPER(cfdb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + int32_t ret = float64_to_int32(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 128-bit float to 32-bit int */ +uint64_t HELPER(cfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float128 v2 = make_float128(h, l); + int32_t ret = float128_to_int32(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 32-bit float to 64-bit uint */ +uint64_t HELPER(clgeb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + uint64_t ret; + v2 = float32_to_float64(v2, &env->fpu_status); + ret = float64_to_uint64(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 64-bit float to 64-bit uint */ +uint64_t HELPER(clgdb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + uint64_t ret = float64_to_uint64(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 128-bit float to 64-bit uint */ +uint64_t HELPER(clgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float128 v2 = make_float128(h, l); + /* ??? Not 100% correct. */ + uint64_t ret = float128_to_int64(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 32-bit float to 32-bit uint */ +uint64_t HELPER(clfeb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + uint32_t ret = float32_to_uint32(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 64-bit float to 32-bit uint */ +uint64_t HELPER(clfdb)(CPUS390XState *env, uint64_t v2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + uint32_t ret = float64_to_uint32(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* convert 128-bit float to 32-bit uint */ +uint64_t HELPER(clfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float128 v2 = make_float128(h, l); + /* Not 100% correct. */ + uint32_t ret = float128_to_int64(v2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* round to integer 32-bit */ +uint64_t HELPER(fieb)(CPUS390XState *env, uint64_t f2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float32 ret = float32_round_to_int(f2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* round to integer 64-bit */ +uint64_t HELPER(fidb)(CPUS390XState *env, uint64_t f2, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float64 ret = float64_round_to_int(f2, &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return ret; +} + +/* round to integer 128-bit */ +uint64_t HELPER(fixb)(CPUS390XState *env, uint64_t ah, uint64_t al, uint32_t m3) +{ + int hold = swap_round_mode(env, m3); + float128 ret = float128_round_to_int(make_float128(ah, al), + &env->fpu_status); + set_float_rounding_mode(hold, &env->fpu_status); + handle_exceptions(env, GETPC()); + return RET128(ret); +} + +/* 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, 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, 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, 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, GETPC()); + return ret; +} + +/* test data class 32-bit */ +uint32_t HELPER(tceb)(CPUS390XState *env, uint64_t f1, uint64_t m2) +{ + float32 v1 = f1; + int neg = float32_is_neg(v1); + uint32_t cc = 0; + + if ((float32_is_zero(v1) && (m2 & (1 << (11-neg)))) || + (float32_is_infinity(v1) && (m2 & (1 << (5-neg)))) || + (float32_is_any_nan(v1) && (m2 & (1 << (3-neg)))) || + (float32_is_signaling_nan(v1, &env->fpu_status) && + (m2 & (1 << (1-neg))))) { + cc = 1; + } else if (m2 & (1 << (9-neg))) { + /* assume normalized number */ + cc = 1; + } + /* FIXME: denormalized? */ + return cc; +} + +/* test data class 64-bit */ +uint32_t HELPER(tcdb)(CPUS390XState *env, uint64_t v1, uint64_t m2) +{ + int neg = float64_is_neg(v1); + uint32_t cc = 0; + + if ((float64_is_zero(v1) && (m2 & (1 << (11-neg)))) || + (float64_is_infinity(v1) && (m2 & (1 << (5-neg)))) || + (float64_is_any_nan(v1) && (m2 & (1 << (3-neg)))) || + (float64_is_signaling_nan(v1, &env->fpu_status) && + (m2 & (1 << (1-neg))))) { + cc = 1; + } else if (m2 & (1 << (9-neg))) { + /* assume normalized number */ + cc = 1; + } + /* FIXME: denormalized? */ + return cc; +} + +/* test data class 128-bit */ +uint32_t HELPER(tcxb)(CPUS390XState *env, uint64_t ah, + uint64_t al, uint64_t m2) +{ + float128 v1 = make_float128(ah, al); + int neg = float128_is_neg(v1); + uint32_t cc = 0; + + if ((float128_is_zero(v1) && (m2 & (1 << (11-neg)))) || + (float128_is_infinity(v1) && (m2 & (1 << (5-neg)))) || + (float128_is_any_nan(v1) && (m2 & (1 << (3-neg)))) || + (float128_is_signaling_nan(v1, &env->fpu_status) && + (m2 & (1 << (1-neg))))) { + cc = 1; + } else if (m2 & (1 << (9-neg))) { + /* assume normalized number */ + cc = 1; + } + /* FIXME: denormalized? */ + return cc; +} + +/* square root 32-bit */ +uint64_t HELPER(sqeb)(CPUS390XState *env, uint64_t f2) +{ + float32 ret = float32_sqrt(f2, &env->fpu_status); + handle_exceptions(env, 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, 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, GETPC()); + return RET128(ret); +} + +static const int fpc_to_rnd[4] = { + float_round_nearest_even, + float_round_to_zero, + float_round_up, + float_round_down +}; + +/* set fpc */ +void HELPER(sfpc)(CPUS390XState *env, uint64_t fpc) +{ + /* 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 & 3], &env->fpu_status); +} + +/* set fpc and signal */ +void HELPER(sfas)(CPUS390XState *env, uint64_t val) +{ + uint32_t signalling = env->fpc; + uint32_t source = val; + uint32_t s390_exc; + + /* The contents of the source operand are placed in the FPC register; + then the flags in the FPC register are set to the logical OR of the + signalling flags and the source flags. */ + env->fpc = source | (signalling & 0x00ff0000); + set_float_rounding_mode(fpc_to_rnd[source & 3], &env->fpu_status); + + /* If any signalling flag is 1 and the corresponding source mask + is also 1, a simulated-iee-exception trap occurs. */ + s390_exc = (signalling >> 16) & (source >> 24); + if (s390_exc) { + ieee_exception(env, s390_exc | 3, GETPC()); + } +} |