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target-i386: Wrong conversion infinity from float80 to int32/int64

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Backports commit ea32aaf1a72af102b855317b47a22e75ac2965a9 from qemu
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Dmitry Poletaev 2018-02-14 15:59:51 -05:00 committed by Lioncash
parent a771209389
commit fff0c621da
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 19 additions and 1 deletions
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20
qemu/target-i386/fpu_helper.c
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@ -250,16 +250,34 @@ int32_t helper_fist_ST0(CPUX86State *env)
int32_t helper_fistl_ST0(CPUX86State *env)
{
int32_t val;
signed char old_exp_flags;
old_exp_flags = get_float_exception_flags(&env->fp_status);
set_float_exception_flags(0, &env->fp_status);
val = floatx80_to_int32(ST0, &env->fp_status);
if (get_float_exception_flags(&env->fp_status) & float_flag_invalid) {
val = 0x80000000;
}
set_float_exception_flags(get_float_exception_flags(&env->fp_status)
| old_exp_flags, &env->fp_status);
return val;
}
int64_t helper_fistll_ST0(CPUX86State *env)
{
int64_t val;
signed char old_exp_flags;
val = floatx80_to_int64(ST0, &env->fp_status);
old_exp_flags = get_float_exception_flags(&env->fp_status);
set_float_exception_flags(0, &env->fp_status);
val = floatx80_to_int32(ST0, &env->fp_status);
if (get_float_exception_flags(&env->fp_status) & float_flag_invalid) {
val = 0x8000000000000000ULL;
}
set_float_exception_flags(get_float_exception_flags(&env->fp_status)
| old_exp_flags, &env->fp_status);
return val;
}