355 lines
8.2 KiB
C
355 lines
8.2 KiB
C
/*
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* Helpers for vax floating point instructions.
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*
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* Copyright (c) 2007 Jocelyn Mayer
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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 "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/helper-proto.h"
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#include "fpu/softfloat.h"
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#define FP_STATUS (env->fp_status)
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/* F floating (VAX) */
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static uint64_t float32_to_f(float32 fa)
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{
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uint64_t r, exp, mant, sig;
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CPU_FloatU a;
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a.f = fa;
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sig = ((uint64_t)a.l & 0x80000000) << 32;
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exp = (a.l >> 23) & 0xff;
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mant = ((uint64_t)a.l & 0x007fffff) << 29;
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if (exp == 255) {
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/* NaN or infinity */
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r = 1; /* VAX dirty zero */
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} else if (exp == 0) {
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if (mant == 0) {
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/* Zero */
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r = 0;
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} else {
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/* Denormalized */
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r = sig | ((exp + 1) << 52) | mant;
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}
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} else {
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if (exp >= 253) {
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/* Overflow */
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r = 1; /* VAX dirty zero */
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} else {
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r = sig | ((exp + 2) << 52);
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}
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}
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return r;
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}
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static float32 f_to_float32(CPUAlphaState *env, uintptr_t retaddr, uint64_t a)
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{
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uint32_t exp, mant_sig;
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CPU_FloatU r;
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exp = ((a >> 55) & 0x80) | ((a >> 52) & 0x7f);
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mant_sig = ((a >> 32) & 0x80000000) | ((a >> 29) & 0x007fffff);
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if (unlikely(!exp && mant_sig)) {
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/* Reserved operands / Dirty zero */
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dynamic_excp(env, retaddr, EXCP_OPCDEC, 0);
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}
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if (exp < 3) {
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/* Underflow */
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r.l = 0;
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} else {
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r.l = ((exp - 2) << 23) | mant_sig;
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}
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return r.f;
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}
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uint32_t helper_f_to_memory(uint64_t a)
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{
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uint32_t r;
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r = (a & 0x00001fffe0000000ull) >> 13;
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r |= (a & 0x07ffe00000000000ull) >> 45;
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r |= (a & 0xc000000000000000ull) >> 48;
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return r;
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}
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uint64_t helper_memory_to_f(uint32_t a)
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{
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uint64_t r;
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r = ((uint64_t)(a & 0x0000c000)) << 48;
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r |= ((uint64_t)(a & 0x003fffff)) << 45;
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r |= ((uint64_t)(a & 0xffff0000)) << 13;
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if (!(a & 0x00004000)) {
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r |= 0x7ll << 59;
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}
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return r;
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}
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/* ??? Emulating VAX arithmetic with IEEE arithmetic is wrong. We should
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either implement VAX arithmetic properly or just signal invalid opcode. */
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uint64_t helper_addf(CPUAlphaState *env, uint64_t a, uint64_t b)
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{
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float32 fa, fb, fr;
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fa = f_to_float32(env, GETPC(), a);
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fb = f_to_float32(env, GETPC(), b);
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fr = float32_add(fa, fb, &FP_STATUS);
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return float32_to_f(fr);
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}
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uint64_t helper_subf(CPUAlphaState *env, uint64_t a, uint64_t b)
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{
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float32 fa, fb, fr;
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fa = f_to_float32(env, GETPC(), a);
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fb = f_to_float32(env, GETPC(), b);
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fr = float32_sub(fa, fb, &FP_STATUS);
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return float32_to_f(fr);
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}
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uint64_t helper_mulf(CPUAlphaState *env, uint64_t a, uint64_t b)
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{
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float32 fa, fb, fr;
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fa = f_to_float32(env, GETPC(), a);
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fb = f_to_float32(env, GETPC(), b);
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fr = float32_mul(fa, fb, &FP_STATUS);
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return float32_to_f(fr);
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}
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uint64_t helper_divf(CPUAlphaState *env, uint64_t a, uint64_t b)
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{
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float32 fa, fb, fr;
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fa = f_to_float32(env, GETPC(), a);
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fb = f_to_float32(env, GETPC(), b);
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fr = float32_div(fa, fb, &FP_STATUS);
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return float32_to_f(fr);
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}
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uint64_t helper_sqrtf(CPUAlphaState *env, uint64_t t)
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{
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float32 ft, fr;
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ft = f_to_float32(env, GETPC(), t);
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fr = float32_sqrt(ft, &FP_STATUS);
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return float32_to_f(fr);
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}
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/* G floating (VAX) */
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static uint64_t float64_to_g(float64 fa)
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{
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uint64_t r, exp, mant, sig;
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CPU_DoubleU a;
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a.d = fa;
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sig = a.ll & 0x8000000000000000ull;
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exp = (a.ll >> 52) & 0x7ff;
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mant = a.ll & 0x000fffffffffffffull;
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if (exp == 2047) {
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/* NaN or infinity */
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r = 1; /* VAX dirty zero */
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} else if (exp == 0) {
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if (mant == 0) {
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/* Zero */
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r = 0;
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} else {
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/* Denormalized */
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r = sig | ((exp + 1) << 52) | mant;
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}
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} else {
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if (exp >= 2045) {
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/* Overflow */
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r = 1; /* VAX dirty zero */
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} else {
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r = sig | ((exp + 2) << 52);
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}
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}
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return r;
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}
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static float64 g_to_float64(CPUAlphaState *env, uintptr_t retaddr, uint64_t a)
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{
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uint64_t exp, mant_sig;
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CPU_DoubleU r;
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exp = (a >> 52) & 0x7ff;
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mant_sig = a & 0x800fffffffffffffull;
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if (!exp && mant_sig) {
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/* Reserved operands / Dirty zero */
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dynamic_excp(env, retaddr, EXCP_OPCDEC, 0);
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}
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if (exp < 3) {
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/* Underflow */
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r.ll = 0;
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} else {
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r.ll = ((exp - 2) << 52) | mant_sig;
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}
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return r.d;
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}
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uint64_t helper_g_to_memory(uint64_t a)
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{
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uint64_t r;
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r = (a & 0x000000000000ffffull) << 48;
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r |= (a & 0x00000000ffff0000ull) << 16;
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r |= (a & 0x0000ffff00000000ull) >> 16;
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r |= (a & 0xffff000000000000ull) >> 48;
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return r;
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}
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uint64_t helper_memory_to_g(uint64_t a)
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{
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uint64_t r;
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r = (a & 0x000000000000ffffull) << 48;
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r |= (a & 0x00000000ffff0000ull) << 16;
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r |= (a & 0x0000ffff00000000ull) >> 16;
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r |= (a & 0xffff000000000000ull) >> 48;
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return r;
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}
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uint64_t helper_addg(CPUAlphaState *env, uint64_t a, uint64_t b)
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{
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float64 fa, fb, fr;
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fa = g_to_float64(env, GETPC(), a);
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fb = g_to_float64(env, GETPC(), b);
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fr = float64_add(fa, fb, &FP_STATUS);
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return float64_to_g(fr);
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}
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uint64_t helper_subg(CPUAlphaState *env, uint64_t a, uint64_t b)
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{
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float64 fa, fb, fr;
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fa = g_to_float64(env, GETPC(), a);
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fb = g_to_float64(env, GETPC(), b);
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fr = float64_sub(fa, fb, &FP_STATUS);
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return float64_to_g(fr);
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}
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uint64_t helper_mulg(CPUAlphaState *env, uint64_t a, uint64_t b)
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{
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float64 fa, fb, fr;
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fa = g_to_float64(env, GETPC(), a);
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fb = g_to_float64(env, GETPC(), b);
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fr = float64_mul(fa, fb, &FP_STATUS);
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return float64_to_g(fr);
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}
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uint64_t helper_divg(CPUAlphaState *env, uint64_t a, uint64_t b)
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{
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float64 fa, fb, fr;
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fa = g_to_float64(env, GETPC(), a);
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fb = g_to_float64(env, GETPC(), b);
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fr = float64_div(fa, fb, &FP_STATUS);
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return float64_to_g(fr);
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}
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uint64_t helper_sqrtg(CPUAlphaState *env, uint64_t a)
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{
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float64 fa, fr;
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fa = g_to_float64(env, GETPC(), a);
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fr = float64_sqrt(fa, &FP_STATUS);
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return float64_to_g(fr);
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}
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uint64_t helper_cmpgeq(CPUAlphaState *env, uint64_t a, uint64_t b)
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{
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float64 fa, fb;
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fa = g_to_float64(env, GETPC(), a);
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fb = g_to_float64(env, GETPC(), b);
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if (float64_eq_quiet(fa, fb, &FP_STATUS)) {
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return 0x4000000000000000ULL;
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} else {
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return 0;
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}
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}
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uint64_t helper_cmpgle(CPUAlphaState *env, uint64_t a, uint64_t b)
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{
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float64 fa, fb;
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fa = g_to_float64(env, GETPC(), a);
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fb = g_to_float64(env, GETPC(), b);
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if (float64_le(fa, fb, &FP_STATUS)) {
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return 0x4000000000000000ULL;
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} else {
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return 0;
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}
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}
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uint64_t helper_cmpglt(CPUAlphaState *env, uint64_t a, uint64_t b)
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{
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float64 fa, fb;
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fa = g_to_float64(env, GETPC(), a);
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fb = g_to_float64(env, GETPC(), b);
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if (float64_lt(fa, fb, &FP_STATUS)) {
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return 0x4000000000000000ULL;
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} else {
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return 0;
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}
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}
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uint64_t helper_cvtqf(CPUAlphaState *env, uint64_t a)
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{
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float32 fr = int64_to_float32(a, &FP_STATUS);
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return float32_to_f(fr);
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}
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uint64_t helper_cvtgf(CPUAlphaState *env, uint64_t a)
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{
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float64 fa;
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float32 fr;
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fa = g_to_float64(env, GETPC(), a);
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fr = float64_to_float32(fa, &FP_STATUS);
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return float32_to_f(fr);
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}
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uint64_t helper_cvtgq(CPUAlphaState *env, uint64_t a)
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{
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float64 fa = g_to_float64(env, GETPC(), a);
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return float64_to_int64_round_to_zero(fa, &FP_STATUS);
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}
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uint64_t helper_cvtqg(CPUAlphaState *env, uint64_t a)
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{
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float64 fr;
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fr = int64_to_float64(a, &FP_STATUS);
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return float64_to_g(fr);
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}
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