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target/ppc: do not silence snan in xscvspdpn

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The non-signalling versions of VSX scalar convert to shorter/longer
precision insns doesn't silence SNaNs in the hardware. To better match
this behavior, use the non-arithmatic conversion of helper_todouble
instead of float32_to_float64. A test is added to prevent future
regressions.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20211228120310.1957990-1-matheus.ferst@eldorado.org.br>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Matheus Ferst 2022-01-04 07:55:34 +01:00 • committed by Cédric Le Goater
parent fbe08667c5
commit 84ade98e87
4 changed files with 42 additions and 8 deletions
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5
target/ppc/fpu_helper.c
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@ -2816,10 +2816,7 @@ uint64_t helper_xscvdpspn(CPUPPCState *env, uint64_t xb)
uint64_t helper_xscvspdpn(CPUPPCState *env, uint64_t xb)
{
float_status tstat = env->fp_status;
set_float_exception_flags(0, &tstat);
return float32_to_float64(xb >> 32, &tstat);
return helper_todouble(xb >> 32);
}
/*