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target/ppc: Set Float3NaNPropRule explicitly

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Set the Float3NaNPropRule explicitly for PPC, and remove the
ifdef from pickNaNMulAdd().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241202131347.498124-20-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2024-12-11 15:30:57 +00:00
parent 9d0b8f9605
commit ac1254c4e7
2 changed files with 8 additions and 6 deletions
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8
target/ppc/cpu_init.c
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@ -7270,6 +7270,14 @@ static void ppc_cpu_reset_hold(Object *obj, ResetType type)
*/
set_float_2nan_prop_rule(float_2nan_prop_ab, &env->fp_status);
set_float_2nan_prop_rule(float_2nan_prop_ab, &env->vec_status);
/*
* NaN propagation for fused multiply-add:
* if fRA is a NaN return it; otherwise if fRB is a NaN return it;
* otherwise return fRC. Note that muladd on PPC is (fRA * fRC) + frB
* whereas QEMU labels the operands as (a * b) + c.
*/
set_float_3nan_prop_rule(float_3nan_prop_acb, &env->fp_status);
set_float_3nan_prop_rule(float_3nan_prop_acb, &env->vec_status);
/*
* For PPC, the (inf,zero,qnan) case sets InvalidOp, but we prefer
* to return an input NaN if we have one (ie c) rather than generating