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softfloat: Add float_muladd_suppress_add_product_zero

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Certain Hexagon instructions suppress changes to the result
when the product of fma() is a true zero.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-08 09:13:45 -06:00
parent 72330260cd
commit 82f898f3b6
3 changed files with 11 additions and 1 deletions
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3
fpu/softfloat.c
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@ -2274,6 +2274,9 @@ float32_muladd(float32 xa, float32 xb, float32 xc, int flags, float_status *s)
if (unlikely(!can_use_fpu(s))) {
goto soft;
}
if (unlikely(flags & float_muladd_suppress_add_product_zero)) {
goto soft;
}
float32_input_flush3(&ua.s, &ub.s, &uc.s, s);
if (unlikely(!f32_is_zon3(ua, ub, uc))) {