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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
2024-12-24 08:32:15 -08:00
parent 72330260cd
commit 82f898f3b6
3 changed files with 11 additions and 1 deletions
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include/fpu/softfloat.h
+5
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@@ -120,11 +120,16 @@ bfloat16 bfloat16_squash_input_denormal(bfloat16 a, float_status *status);
| Using these differs from negating an input or output before calling
| the muladd function in that this means that a NaN doesn't have its
| sign bit inverted before it is propagated.
|
| With float_muladd_suppress_add_product_zero, if A or B is zero
| such that the product is a true zero, then return C without addition.
| This preserves the sign of C when C is +/- 0. Used for Hexagon.
*----------------------------------------------------------------------------*/
enum {
float_muladd_negate_c = 1,
float_muladd_negate_product = 2,
float_muladd_negate_result = 4,
float_muladd_suppress_add_product_zero = 8,
};
/*----------------------------------------------------------------------------