713 lines
21 KiB
C
713 lines
21 KiB
C
/*
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* S/390 FPU helper routines
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*
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* Copyright (c) 2009 Ulrich Hecht
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* Copyright (c) 2009 Alexander Graf
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "cpu.h"
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#include "exec/cpu_ldst.h"
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#include "exec/helper-proto.h"
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/* #define DEBUG_HELPER */
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#ifdef DEBUG_HELPER
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#define HELPER_LOG(x...) qemu_log(x)
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#else
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#define HELPER_LOG(x...)
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#endif
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#define RET128(F) (env->retxl = F.low, F.high)
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#define convert_bit(mask, from, to) \
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(to < from \
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? (mask / (from / to)) & to \
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: (mask & from) * (to / from))
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static void ieee_exception(CPUS390XState *env, uint32_t dxc, uintptr_t retaddr)
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{
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/* Install the DXC code. */
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env->fpc = (env->fpc & ~0xff00) | (dxc << 8);
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/* Trap. */
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runtime_exception(env, PGM_DATA, retaddr);
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}
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/* Should be called after any operation that may raise IEEE exceptions. */
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static void handle_exceptions(CPUS390XState *env, uintptr_t retaddr)
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{
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unsigned s390_exc, qemu_exc;
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/* Get the exceptions raised by the current operation. Reset the
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fpu_status contents so that the next operation has a clean slate. */
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qemu_exc = env->fpu_status.float_exception_flags;
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if (qemu_exc == 0) {
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return;
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}
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env->fpu_status.float_exception_flags = 0;
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/* Convert softfloat exception bits to s390 exception bits. */
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s390_exc = 0;
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s390_exc |= convert_bit(qemu_exc, float_flag_invalid, 0x80);
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s390_exc |= convert_bit(qemu_exc, float_flag_divbyzero, 0x40);
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s390_exc |= convert_bit(qemu_exc, float_flag_overflow, 0x20);
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s390_exc |= convert_bit(qemu_exc, float_flag_underflow, 0x10);
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s390_exc |= convert_bit(qemu_exc, float_flag_inexact, 0x08);
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/* Install the exceptions that we raised. */
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env->fpc |= s390_exc << 16;
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/* Send signals for enabled exceptions. */
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s390_exc &= env->fpc >> 24;
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if (s390_exc) {
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ieee_exception(env, s390_exc, retaddr);
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}
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}
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static inline int float_comp_to_cc(CPUS390XState *env, int float_compare)
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{
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S390CPU *cpu = s390_env_get_cpu(env);
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switch (float_compare) {
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case float_relation_equal:
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return 0;
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case float_relation_less:
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return 1;
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case float_relation_greater:
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return 2;
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case float_relation_unordered:
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return 3;
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default:
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cpu_abort(CPU(cpu), "unknown return value for float compare\n");
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}
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}
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/* condition codes for unary FP ops */
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uint32_t set_cc_nz_f32(float32 v)
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{
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if (float32_is_any_nan(v)) {
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return 3;
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} else if (float32_is_zero(v)) {
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return 0;
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} else if (float32_is_neg(v)) {
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return 1;
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} else {
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return 2;
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}
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}
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uint32_t set_cc_nz_f64(float64 v)
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{
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if (float64_is_any_nan(v)) {
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return 3;
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} else if (float64_is_zero(v)) {
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return 0;
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} else if (float64_is_neg(v)) {
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return 1;
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} else {
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return 2;
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}
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}
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uint32_t set_cc_nz_f128(float128 v)
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{
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if (float128_is_any_nan(v)) {
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return 3;
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} else if (float128_is_zero(v)) {
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return 0;
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} else if (float128_is_neg(v)) {
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return 1;
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} else {
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return 2;
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}
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}
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/* 32-bit FP addition */
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uint64_t HELPER(aeb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
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{
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float32 ret = float32_add(f1, f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* 64-bit FP addition */
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uint64_t HELPER(adb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
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{
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float64 ret = float64_add(f1, f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* 128-bit FP addition */
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uint64_t HELPER(axb)(CPUS390XState *env, uint64_t ah, uint64_t al,
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uint64_t bh, uint64_t bl)
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{
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float128 ret = float128_add(make_float128(ah, al),
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make_float128(bh, bl),
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&env->fpu_status);
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handle_exceptions(env, GETPC());
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return RET128(ret);
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}
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/* 32-bit FP subtraction */
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uint64_t HELPER(seb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
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{
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float32 ret = float32_sub(f1, f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* 64-bit FP subtraction */
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uint64_t HELPER(sdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
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{
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float64 ret = float64_sub(f1, f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* 128-bit FP subtraction */
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uint64_t HELPER(sxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
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uint64_t bh, uint64_t bl)
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{
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float128 ret = float128_sub(make_float128(ah, al),
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make_float128(bh, bl),
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&env->fpu_status);
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handle_exceptions(env, GETPC());
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return RET128(ret);
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}
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/* 32-bit FP division */
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uint64_t HELPER(deb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
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{
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float32 ret = float32_div(f1, f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* 64-bit FP division */
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uint64_t HELPER(ddb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
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{
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float64 ret = float64_div(f1, f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* 128-bit FP division */
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uint64_t HELPER(dxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
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uint64_t bh, uint64_t bl)
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{
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float128 ret = float128_div(make_float128(ah, al),
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make_float128(bh, bl),
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&env->fpu_status);
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handle_exceptions(env, GETPC());
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return RET128(ret);
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}
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/* 32-bit FP multiplication */
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uint64_t HELPER(meeb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
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{
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float32 ret = float32_mul(f1, f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* 64-bit FP multiplication */
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uint64_t HELPER(mdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
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{
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float64 ret = float64_mul(f1, f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* 64/32-bit FP multiplication */
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uint64_t HELPER(mdeb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
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{
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float64 ret = float32_to_float64(f2, &env->fpu_status);
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ret = float64_mul(f1, ret, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* 128-bit FP multiplication */
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uint64_t HELPER(mxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
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uint64_t bh, uint64_t bl)
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{
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float128 ret = float128_mul(make_float128(ah, al),
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make_float128(bh, bl),
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&env->fpu_status);
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handle_exceptions(env, GETPC());
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return RET128(ret);
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}
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/* 128/64-bit FP multiplication */
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uint64_t HELPER(mxdb)(CPUS390XState *env, uint64_t ah, uint64_t al,
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uint64_t f2)
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{
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float128 ret = float64_to_float128(f2, &env->fpu_status);
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ret = float128_mul(make_float128(ah, al), ret, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return RET128(ret);
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}
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/* convert 32-bit float to 64-bit float */
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uint64_t HELPER(ldeb)(CPUS390XState *env, uint64_t f2)
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{
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float64 ret = float32_to_float64(f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* convert 128-bit float to 64-bit float */
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uint64_t HELPER(ldxb)(CPUS390XState *env, uint64_t ah, uint64_t al)
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{
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float64 ret = float128_to_float64(make_float128(ah, al), &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* convert 64-bit float to 128-bit float */
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uint64_t HELPER(lxdb)(CPUS390XState *env, uint64_t f2)
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{
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float128 ret = float64_to_float128(f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return RET128(ret);
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}
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/* convert 32-bit float to 128-bit float */
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uint64_t HELPER(lxeb)(CPUS390XState *env, uint64_t f2)
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{
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float128 ret = float32_to_float128(f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return RET128(ret);
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}
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/* convert 64-bit float to 32-bit float */
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uint64_t HELPER(ledb)(CPUS390XState *env, uint64_t f2)
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{
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float32 ret = float64_to_float32(f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* convert 128-bit float to 32-bit float */
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uint64_t HELPER(lexb)(CPUS390XState *env, uint64_t ah, uint64_t al)
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{
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float32 ret = float128_to_float32(make_float128(ah, al), &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* 32-bit FP compare */
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uint32_t HELPER(ceb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
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{
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int cmp = float32_compare_quiet(f1, f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return float_comp_to_cc(env, cmp);
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}
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/* 64-bit FP compare */
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uint32_t HELPER(cdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
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{
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int cmp = float64_compare_quiet(f1, f2, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return float_comp_to_cc(env, cmp);
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}
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/* 128-bit FP compare */
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uint32_t HELPER(cxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
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uint64_t bh, uint64_t bl)
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{
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int cmp = float128_compare_quiet(make_float128(ah, al),
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make_float128(bh, bl),
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&env->fpu_status);
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handle_exceptions(env, GETPC());
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return float_comp_to_cc(env, cmp);
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}
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static int swap_round_mode(CPUS390XState *env, int m3)
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{
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int ret = env->fpu_status.float_rounding_mode;
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switch (m3) {
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case 0:
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/* current mode */
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break;
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case 1:
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/* biased round no nearest */
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case 4:
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/* round to nearest */
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set_float_rounding_mode(float_round_nearest_even, &env->fpu_status);
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break;
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case 5:
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/* round to zero */
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set_float_rounding_mode(float_round_to_zero, &env->fpu_status);
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break;
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case 6:
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/* round to +inf */
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set_float_rounding_mode(float_round_up, &env->fpu_status);
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break;
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case 7:
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/* round to -inf */
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set_float_rounding_mode(float_round_down, &env->fpu_status);
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break;
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}
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return ret;
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}
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/* convert 64-bit int to 32-bit float */
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uint64_t HELPER(cegb)(CPUS390XState *env, int64_t v2, uint32_t m3)
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{
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int hold = swap_round_mode(env, m3);
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float32 ret = int64_to_float32(v2, &env->fpu_status);
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set_float_rounding_mode(hold, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* convert 64-bit int to 64-bit float */
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uint64_t HELPER(cdgb)(CPUS390XState *env, int64_t v2, uint32_t m3)
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{
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int hold = swap_round_mode(env, m3);
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float64 ret = int64_to_float64(v2, &env->fpu_status);
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set_float_rounding_mode(hold, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* convert 64-bit int to 128-bit float */
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uint64_t HELPER(cxgb)(CPUS390XState *env, int64_t v2, uint32_t m3)
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{
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int hold = swap_round_mode(env, m3);
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float128 ret = int64_to_float128(v2, &env->fpu_status);
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set_float_rounding_mode(hold, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return RET128(ret);
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}
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/* convert 64-bit uint to 32-bit float */
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uint64_t HELPER(celgb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
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{
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int hold = swap_round_mode(env, m3);
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float32 ret = uint64_to_float32(v2, &env->fpu_status);
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set_float_rounding_mode(hold, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* convert 64-bit uint to 64-bit float */
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uint64_t HELPER(cdlgb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
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{
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int hold = swap_round_mode(env, m3);
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float64 ret = uint64_to_float64(v2, &env->fpu_status);
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set_float_rounding_mode(hold, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* convert 64-bit uint to 128-bit float */
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uint64_t HELPER(cxlgb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
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{
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int hold = swap_round_mode(env, m3);
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float128 ret = uint64_to_float128(v2, &env->fpu_status);
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set_float_rounding_mode(hold, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return RET128(ret);
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}
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/* convert 32-bit float to 64-bit int */
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uint64_t HELPER(cgeb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
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{
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int hold = swap_round_mode(env, m3);
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int64_t ret = float32_to_int64(v2, &env->fpu_status);
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set_float_rounding_mode(hold, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* convert 64-bit float to 64-bit int */
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uint64_t HELPER(cgdb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
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{
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int hold = swap_round_mode(env, m3);
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int64_t ret = float64_to_int64(v2, &env->fpu_status);
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set_float_rounding_mode(hold, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* convert 128-bit float to 64-bit int */
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uint64_t HELPER(cgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3)
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{
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int hold = swap_round_mode(env, m3);
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float128 v2 = make_float128(h, l);
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int64_t ret = float128_to_int64(v2, &env->fpu_status);
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set_float_rounding_mode(hold, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* convert 32-bit float to 32-bit int */
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uint64_t HELPER(cfeb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
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{
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int hold = swap_round_mode(env, m3);
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int32_t ret = float32_to_int32(v2, &env->fpu_status);
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set_float_rounding_mode(hold, &env->fpu_status);
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handle_exceptions(env, GETPC());
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return ret;
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}
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/* convert 64-bit float to 32-bit int */
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uint64_t HELPER(cfdb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
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{
|
|
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;
|
|
}
|
|
|
|
/* 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)(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) && (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)(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) && (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)(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) && (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());
|
|
}
|
|
}
|