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softfloat: Add float{16,32,64}_muladd_scalbn

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We currently have a flag, float_muladd_halve_result, to scale
the result by 2**-1.  Extend this to handle arbitrary scaling.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-07 17:21:25 -06:00
parent 29f6586f61
commit 910556bbf4
3 changed files with 44 additions and 27 deletions
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6
include/fpu/softfloat.h
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@ -238,6 +238,8 @@ float16 float16_add(float16, float16, float_status *status);
float16 float16_sub(float16, float16, float_status *status);
float16 float16_mul(float16, float16, float_status *status);
float16 float16_muladd(float16, float16, float16, int, float_status *status);
float16 float16_muladd_scalbn(float16, float16, float16,
int, int, float_status *status);
float16 float16_div(float16, float16, float_status *status);
float16 float16_scalbn(float16, int, float_status *status);
float16 float16_min(float16, float16, float_status *status);
@ -597,6 +599,8 @@ float32 float32_mul(float32, float32, float_status *status);
float32 float32_div(float32, float32, float_status *status);
float32 float32_rem(float32, float32, float_status *status);
float32 float32_muladd(float32, float32, float32, int, float_status *status);
float32 float32_muladd_scalbn(float32, float32, float32,
int, int, float_status *status);
float32 float32_sqrt(float32, float_status *status);
float32 float32_exp2(float32, float_status *status);
float32 float32_log2(float32, float_status *status);
@ -792,6 +796,8 @@ float64 float64_mul(float64, float64, float_status *status);
float64 float64_div(float64, float64, float_status *status);
float64 float64_rem(float64, float64, float_status *status);
float64 float64_muladd(float64, float64, float64, int, float_status *status);
float64 float64_muladd_scalbn(float64, float64, float64,
int, int, float_status *status);
float64 float64_sqrt(float64, float_status *status);
float64 float64_log2(float64, float_status *status);
FloatRelation float64_compare(float64, float64, float_status *status);