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/*
* m68k FPU helpers
*
* Copyright (c) 2006-2007 CodeSourcery
* Written by Paul Brook
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/helper-proto.h"
#include "exec/exec-all.h"
/* Undefined offsets may be different on various FPU.
* On 68040 they return 0.0 (floatx80_zero)
*/
static const floatx80 fpu_rom[128] = {
[0x00] = floatx80_pi, /* Pi */
[0x0b] = make_floatx80(0x3ffd, 0x9a209a84fbcff798ULL), /* Log10(2) */
[0x0c] = make_floatx80(0x4000, 0xadf85458a2bb4a9aULL), /* e */
[0x0d] = make_floatx80(0x3fff, 0xb8aa3b295c17f0bcULL), /* Log2(e) */
[0x0e] = make_floatx80(0x3ffd, 0xde5bd8a937287195ULL), /* Log10(e) */
[0x0f] = floatx80_zero, /* Zero */
[0x30] = floatx80_ln2, /* ln(2) */
[0x31] = make_floatx80(0x4000, 0x935d8dddaaa8ac17ULL), /* ln(10) */
[0x32] = floatx80_one, /* 10^0 */
[0x33] = make_floatx80(0x4002, 0xa000000000000000ULL), /* 10^1 */
[0x34] = make_floatx80(0x4005, 0xc800000000000000ULL), /* 10^2 */
[0x35] = make_floatx80(0x400c, 0x9c40000000000000ULL), /* 10^4 */
[0x36] = make_floatx80(0x4019, 0xbebc200000000000ULL), /* 10^8 */
[0x37] = make_floatx80(0x4034, 0x8e1bc9bf04000000ULL), /* 10^16 */
[0x38] = make_floatx80(0x4069, 0x9dc5ada82b70b59eULL), /* 10^32 */
[0x39] = make_floatx80(0x40d3, 0xc2781f49ffcfa6d5ULL), /* 10^64 */
[0x3a] = make_floatx80(0x41a8, 0x93ba47c980e98ce0ULL), /* 10^128 */
[0x3b] = make_floatx80(0x4351, 0xaa7eebfb9df9de8eULL), /* 10^256 */
[0x3c] = make_floatx80(0x46a3, 0xe319a0aea60e91c7ULL), /* 10^512 */
[0x3d] = make_floatx80(0x4d48, 0xc976758681750c17ULL), /* 10^1024 */
[0x3e] = make_floatx80(0x5a92, 0x9e8b3b5dc53d5de5ULL), /* 10^2048 */
[0x3f] = make_floatx80(0x7525, 0xc46052028a20979bULL), /* 10^4096 */
};
int32_t HELPER(reds32)(CPUM68KState *env, FPReg *val)
{
return floatx80_to_int32(val->d, &env->fp_status);
}
float32 HELPER(redf32)(CPUM68KState *env, FPReg *val)
{
return floatx80_to_float32(val->d, &env->fp_status);
}
void HELPER(exts32)(CPUM68KState *env, FPReg *res, int32_t val)
{
res->d = int32_to_floatx80(val, &env->fp_status);
}
void HELPER(extf32)(CPUM68KState *env, FPReg *res, float32 val)
{
res->d = float32_to_floatx80(val, &env->fp_status);
}
void HELPER(extf64)(CPUM68KState *env, FPReg *res, float64 val)
{
res->d = float64_to_floatx80(val, &env->fp_status);
}
float64 HELPER(redf64)(CPUM68KState *env, FPReg *val)
{
return floatx80_to_float64(val->d, &env->fp_status);
}
void HELPER(firound)(CPUM68KState *env, FPReg *res, FPReg *val)
{
res->d = floatx80_round_to_int(val->d, &env->fp_status);
}
static void m68k_restore_precision_mode(CPUM68KState *env)
{
switch (env->fpcr & FPCR_PREC_MASK) {
case FPCR_PREC_X: /* extended */
set_floatx80_rounding_precision(80, &env->fp_status);
break;
case FPCR_PREC_S: /* single */
set_floatx80_rounding_precision(32, &env->fp_status);
break;
case FPCR_PREC_D: /* double */
set_floatx80_rounding_precision(64, &env->fp_status);
break;
case FPCR_PREC_U: /* undefined */
default:
break;
}
}
static void cf_restore_precision_mode(CPUM68KState *env)
{
if (env->fpcr & FPCR_PREC_S) { /* single */
set_floatx80_rounding_precision(32, &env->fp_status);
} else { /* double */
set_floatx80_rounding_precision(64, &env->fp_status);
}
}
static void restore_rounding_mode(CPUM68KState *env)
{
switch (env->fpcr & FPCR_RND_MASK) {
case FPCR_RND_N: /* round to nearest */
set_float_rounding_mode(float_round_nearest_even, &env->fp_status);
break;
case FPCR_RND_Z: /* round to zero */
set_float_rounding_mode(float_round_to_zero, &env->fp_status);
break;
case FPCR_RND_M: /* round toward minus infinity */
set_float_rounding_mode(float_round_down, &env->fp_status);
break;
case FPCR_RND_P: /* round toward positive infinity */
set_float_rounding_mode(float_round_up, &env->fp_status);
break;
}
}
void cpu_m68k_set_fpcr(CPUM68KState *env, uint32_t val)
{
env->fpcr = val & 0xffff;
if (m68k_feature(env, M68K_FEATURE_CF_FPU)) {
cf_restore_precision_mode(env);
} else {
m68k_restore_precision_mode(env);
}
restore_rounding_mode(env);
}
void HELPER(fitrunc)(CPUM68KState *env, FPReg *res, FPReg *val)
{
int rounding_mode = get_float_rounding_mode(&env->fp_status);
set_float_rounding_mode(float_round_to_zero, &env->fp_status);
res->d = floatx80_round_to_int(val->d, &env->fp_status);
set_float_rounding_mode(rounding_mode, &env->fp_status);
}
void HELPER(set_fpcr)(CPUM68KState *env, uint32_t val)
{
cpu_m68k_set_fpcr(env, val);
}
void HELPER(fsqrt)(CPUM68KState *env, FPReg *res, FPReg *val)
{
res->d = floatx80_sqrt(val->d, &env->fp_status);
}
void HELPER(fabs)(CPUM68KState *env, FPReg *res, FPReg *val)
{
res->d = floatx80_abs(val->d);
}
void HELPER(fchs)(CPUM68KState *env, FPReg *res, FPReg *val)
{
res->d = floatx80_chs(val->d);
}
void HELPER(fadd)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
res->d = floatx80_add(val0->d, val1->d, &env->fp_status);
}
void HELPER(fsub)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
res->d = floatx80_sub(val1->d, val0->d, &env->fp_status);
}
void HELPER(fmul)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
res->d = floatx80_mul(val0->d, val1->d, &env->fp_status);
}
void HELPER(fdiv)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
res->d = floatx80_div(val1->d, val0->d, &env->fp_status);
}
static int float_comp_to_cc(int float_compare)
{
switch (float_compare) {
case float_relation_equal:
return FPSR_CC_Z;
case float_relation_less:
return FPSR_CC_N;
case float_relation_unordered:
return FPSR_CC_A;
case float_relation_greater:
return 0;
default:
g_assert_not_reached();
}
}
void HELPER(fcmp)(CPUM68KState *env, FPReg *val0, FPReg *val1)
{
int float_compare;
float_compare = floatx80_compare(val1->d, val0->d, &env->fp_status);
env->fpsr = (env->fpsr & ~FPSR_CC_MASK) | float_comp_to_cc(float_compare);
}
void HELPER(ftst)(CPUM68KState *env, FPReg *val)
{
uint32_t cc = 0;
if (floatx80_is_neg(val->d)) {
cc |= FPSR_CC_N;
}
if (floatx80_is_any_nan(val->d)) {
cc |= FPSR_CC_A;
} else if (floatx80_is_infinity(val->d)) {
cc |= FPSR_CC_I;
} else if (floatx80_is_zero(val->d)) {
cc |= FPSR_CC_Z;
}
env->fpsr = (env->fpsr & ~FPSR_CC_MASK) | cc;
}
void HELPER(fconst)(CPUM68KState *env, FPReg *val, uint32_t offset)
{
val->d = fpu_rom[offset];
}
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