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target-ppc: fadd/fsub: correctly propagate NaN 

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6052 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-12-15 17:14:35 +00:00
parent f23c346e69
commit 17218d1fd9
1 changed files with 8 additions and 18 deletions
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26
target-ppc/op_helper.c
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@ -563,17 +563,7 @@ static always_inline int isden (float64 d)
return ((u.ll >> 52) & 0x7FF) == 0;
}
#ifdef CONFIG_SOFTFLOAT
static always_inline int isfinite (float64 d)
{
CPU_DoubleU u;
u.d = d;
return (((u.ll >> 52) & 0x7FF) != 0x7FF);
}
static always_inline int isnormal (float64 d)
{
CPU_DoubleU u;
@ -1028,12 +1018,12 @@ uint64_t helper_fadd (uint64_t arg1, uint64_t arg2)
float64_is_signaling_nan(farg2.d))) {
/* sNaN addition */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
} else if (likely(isfinite(farg1.d) || isfinite(farg2.d) ||
float64_is_neg(farg1.d) == float64_is_neg(farg2.d))) {
farg1.d = float64_add(farg1.d, farg2.d, &env->fp_status);
} else {
} else if (unlikely(float64_is_infinity(farg1.d) && float64_is_infinity(farg2.d) &&
float64_is_neg(farg1.d) != float64_is_neg(farg2.d))) {
/* Magnitude subtraction of infinities */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXISI);
} else {
farg1.d = float64_add(farg1.d, farg2.d, &env->fp_status);
}
#else
farg1.d = float64_add(farg1.d, farg2.d, &env->fp_status);
@ -1054,12 +1044,12 @@ uint64_t helper_fsub (uint64_t arg1, uint64_t arg2)
float64_is_signaling_nan(farg2.d))) {
/* sNaN subtraction */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
} else if (likely(isfinite(farg1.d) || isfinite(farg2.d) ||
float64_is_neg(farg1.d) != float64_is_neg(farg2.d))) {
farg1.d = float64_sub(farg1.d, farg2.d, &env->fp_status);
} else {
} else if (unlikely(float64_is_infinity(farg1.d) && float64_is_infinity(farg2.d) &&
float64_is_neg(farg1.d) == float64_is_neg(farg2.d))) {
/* Magnitude subtraction of infinities */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXISI);
} else {
farg1.d = float64_sub(farg1.d, farg2.d, &env->fp_status);
}
}
#else