888 lines
28 KiB
C
888 lines
28 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 2.1 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 "qemu/osdep.h"
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#include "cpu.h"
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#include "internal.h"
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#include "tcg_s390x.h"
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#include "exec/exec-all.h"
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#include "exec/cpu_ldst.h"
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#include "exec/helper-proto.h"
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#include "fpu/softfloat.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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uint8_t s390_softfloat_exc_to_ieee(unsigned int exc)
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{
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uint8_t s390_exc = 0;
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s390_exc |= (exc & float_flag_invalid) ? S390_IEEE_MASK_INVALID : 0;
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s390_exc |= (exc & float_flag_divbyzero) ? S390_IEEE_MASK_DIVBYZERO : 0;
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s390_exc |= (exc & float_flag_overflow) ? S390_IEEE_MASK_OVERFLOW : 0;
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s390_exc |= (exc & float_flag_underflow) ? S390_IEEE_MASK_UNDERFLOW : 0;
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s390_exc |= (exc & float_flag_inexact) ? S390_IEEE_MASK_INEXACT : 0;
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return s390_exc;
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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, bool XxC, 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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s390_exc = s390_softfloat_exc_to_ieee(qemu_exc);
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/*
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* IEEE-Underflow exception recognition exists if a tininess condition
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* (underflow) exists and
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* - The mask bit in the FPC is zero and the result is inexact
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* - The mask bit in the FPC is one
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* So tininess conditions that are not inexact don't trigger any
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* underflow action in case the mask bit is not one.
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*/
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if (!(s390_exc & S390_IEEE_MASK_INEXACT) &&
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!((env->fpc >> 24) & S390_IEEE_MASK_UNDERFLOW)) {
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s390_exc &= ~S390_IEEE_MASK_UNDERFLOW;
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}
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/*
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* FIXME:
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* 1. Right now, all inexact conditions are inidicated as
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* "truncated" (0) and never as "incremented" (1) in the DXC.
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* 2. Only traps due to invalid/divbyzero are suppressing. Other traps
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* are completing, meaning the target register has to be written!
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* This, however will mean that we have to write the register before
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* triggering the trap - impossible right now.
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*/
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/*
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* invalid/divbyzero cannot coexist with other conditions.
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* overflow/underflow however can coexist with inexact, we have to
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* handle it separatly.
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*/
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if (s390_exc & ~S390_IEEE_MASK_INEXACT) {
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if (s390_exc & ~S390_IEEE_MASK_INEXACT & env->fpc >> 24) {
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/* trap condition - inexact reported along */
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tcg_s390_data_exception(env, s390_exc, retaddr);
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}
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/* nontrap condition - inexact handled differently */
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env->fpc |= (s390_exc & ~S390_IEEE_MASK_INEXACT) << 16;
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}
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/* inexact handling */
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if (s390_exc & S390_IEEE_MASK_INEXACT && !XxC) {
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/* trap condition - overflow/underflow _not_ reported along */
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if (s390_exc & S390_IEEE_MASK_INEXACT & env->fpc >> 24) {
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tcg_s390_data_exception(env, s390_exc & S390_IEEE_MASK_INEXACT,
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retaddr);
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}
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/* nontrap condition */
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env->fpc |= (s390_exc & S390_IEEE_MASK_INEXACT) << 16;
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}
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}
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int float_comp_to_cc(CPUS390XState *env, FloatRelation float_compare)
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{
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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(env_cpu(env), "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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static inline uint8_t round_from_m34(uint32_t m34)
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{
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return extract32(m34, 0, 4);
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}
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static inline bool xxc_from_m34(uint32_t m34)
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{
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/* XxC is bit 1 of m4 */
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return extract32(m34, 4 + 3 - 1, 1);
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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, false, 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, false, 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, false, 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, false, 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, false, 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, false, 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, false, 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, false, 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, false, 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, false, 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, false, 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, false, 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, false, 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, false, 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, false, 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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uint32_t m34)
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{
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int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
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float64 ret = float128_to_float64(make_float128(ah, al), &env->fpu_status);
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s390_restore_bfp_rounding_mode(env, old_mode);
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handle_exceptions(env, xxc_from_m34(m34), 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, false, 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, false, 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, uint32_t m34)
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{
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int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
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float32 ret = float64_to_float32(f2, &env->fpu_status);
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s390_restore_bfp_rounding_mode(env, old_mode);
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handle_exceptions(env, xxc_from_m34(m34), 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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uint32_t m34)
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{
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int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
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float32 ret = float128_to_float32(make_float128(ah, al), &env->fpu_status);
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s390_restore_bfp_rounding_mode(env, old_mode);
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handle_exceptions(env, xxc_from_m34(m34), 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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FloatRelation cmp = float32_compare_quiet(f1, f2, &env->fpu_status);
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handle_exceptions(env, false, 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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FloatRelation cmp = float64_compare_quiet(f1, f2, &env->fpu_status);
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handle_exceptions(env, false, 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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FloatRelation 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, false, GETPC());
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return float_comp_to_cc(env, cmp);
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}
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int s390_swap_bfp_rounding_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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/* round to nearest with ties away from 0 */
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set_float_rounding_mode(float_round_ties_away, &env->fpu_status);
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break;
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case 3:
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/* round to prepare for shorter precision */
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set_float_rounding_mode(float_round_to_odd, &env->fpu_status);
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break;
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case 4:
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/* round to nearest with ties to even */
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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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default:
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g_assert_not_reached();
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}
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return ret;
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}
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void s390_restore_bfp_rounding_mode(CPUS390XState *env, int old_mode)
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{
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set_float_rounding_mode(old_mode, &env->fpu_status);
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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 m34)
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{
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int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
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float32 ret = int64_to_float32(v2, &env->fpu_status);
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s390_restore_bfp_rounding_mode(env, old_mode);
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handle_exceptions(env, xxc_from_m34(m34), 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 m34)
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{
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int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
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float64 ret = int64_to_float64(v2, &env->fpu_status);
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s390_restore_bfp_rounding_mode(env, old_mode);
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handle_exceptions(env, xxc_from_m34(m34), 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 m34)
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{
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int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
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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);
|
|
|
|
s390_restore_bfp_rounding_mode(env, old_mode);
|
|
handle_exceptions(env, xxc_from_m34(m34), GETPC());
|
|
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);
|
|
|
|
s390_restore_bfp_rounding_mode(env, old_mode);
|
|
handle_exceptions(env, xxc_from_m34(m34), 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 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);
|
|
|
|
s390_restore_bfp_rounding_mode(env, old_mode);
|
|
handle_exceptions(env, xxc_from_m34(m34), GETPC());
|
|
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);
|
|
|
|
s390_restore_bfp_rounding_mode(env, old_mode);
|
|
handle_exceptions(env, xxc_from_m34(m34), GETPC());
|
|
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);
|
|
|
|
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 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);
|
|
|
|
s390_restore_bfp_rounding_mode(env, old_mode);
|
|
handle_exceptions(env, xxc_from_m34(m34), GETPC());
|
|
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;
|
|
|
|
v2 = float32_to_float64(v2, &env->fpu_status);
|
|
ret = float64_to_uint64(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 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);
|
|
|
|
s390_restore_bfp_rounding_mode(env, old_mode);
|
|
handle_exceptions(env, xxc_from_m34(m34), 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 m34)
|
|
{
|
|
int old_mode = s390_swap_bfp_rounding_mode(env, round_from_m34(m34));
|
|
uint64_t ret = float128_to_uint64(make_float128(h, l), &env->fpu_status);
|
|
|
|
s390_restore_bfp_rounding_mode(env, old_mode);
|
|
handle_exceptions(env, xxc_from_m34(m34), GETPC());
|
|
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);
|
|
|
|
s390_restore_bfp_rounding_mode(env, old_mode);
|
|
handle_exceptions(env, xxc_from_m34(m34), GETPC());
|
|
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);
|
|
|
|
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 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));
|
|
uint32_t ret = float128_to_uint32(make_float128(h, l), &env->fpu_status);
|
|
|
|
s390_restore_bfp_rounding_mode(env, old_mode);
|
|
handle_exceptions(env, xxc_from_m34(m34), GETPC());
|
|
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)
|
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{
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if (rnd > 0x7 || fpc_to_rnd[rnd & 0x7] == -1) {
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tcg_s390_program_interrupt(env, PGM_SPECIFICATION, GETPC());
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}
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env->fpc = deposit32(env->fpc, 0, 3, rnd);
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set_float_rounding_mode(fpc_to_rnd[rnd & 0x7], &env->fpu_status);
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}
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