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target/ppc: fmadd check for excp independently

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Current order of checking does not confirm with the spec
(ISA 3.0: MultiplyAddDP page-469). Change the order and make them
independent of each other.

For example: a = infinity, b = zero, c = SNaN, this should set both
VXIMZ and VXNAN

Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Nikunj A Dadhania 2017-03-04 19:32:07 +05:30 committed by David Gibson
parent 17b7c39e27
commit 806c9d71ab
1 changed files with 12 additions and 8 deletions
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20
target/ppc/fpu_helper.c
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@ -747,17 +747,21 @@ static void float64_maddsub_update_excp(CPUPPCState *env, float64 arg1,
float64 arg2, float64 arg3,
unsigned int madd_flags)
{
if (unlikely(float64_is_signaling_nan(arg1, &env->fp_status) ||
float64_is_signaling_nan(arg2, &env->fp_status) ||
float64_is_signaling_nan(arg3, &env->fp_status))) {
/* sNaN operation */
float_invalid_op_excp(env, POWERPC_EXCP_FP_VXSNAN, 1);
}
if (unlikely((float64_is_infinity(arg1) && float64_is_zero(arg2)) ||
(float64_is_zero(arg1) && float64_is_infinity(arg2)))) {
/* Multiplication of zero by infinity */
arg1 = float_invalid_op_excp(env, POWERPC_EXCP_FP_VXIMZ, 1);
} else if (unlikely(float64_is_signaling_nan(arg1, &env->fp_status) ||
float64_is_signaling_nan(arg2, &env->fp_status) ||
float64_is_signaling_nan(arg3, &env->fp_status))) {
/* sNaN operation */
float_invalid_op_excp(env, POWERPC_EXCP_FP_VXSNAN, 1);
} else if ((float64_is_infinity(arg1) || float64_is_infinity(arg2)) &&
float64_is_infinity(arg3)) {
float_invalid_op_excp(env, POWERPC_EXCP_FP_VXIMZ, 1);
}
if ((float64_is_infinity(arg1) || float64_is_infinity(arg2)) &&
float64_is_infinity(arg3)) {
uint8_t aSign, bSign, cSign;
aSign = float64_is_neg(arg1);