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fpu/softfloat: re-factor sqrt

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This is a little bit of a departure from softfloat's original approach
as we skip the estimate step in favour of a straight iteration. There
is a minor optimisation to avoid calculating more bits of precision
than we need however this still brings a performance drop, especially
for float64 operations.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Alex Bennée 2018-01-12 11:24:02 +00:00
parent 0c4c909291
commit c13bb2da9e
2 changed files with 97 additions and 111 deletions
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include/fpu/softfloat.h
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@ -251,6 +251,7 @@ float16 float16_minnum(float16, float16, float_status *status);
float16 float16_maxnum(float16, float16, float_status *status);
float16 float16_minnummag(float16, float16, float_status *status);
float16 float16_maxnummag(float16, float16, float_status *status);
float16 float16_sqrt(float16, float_status *status);
int float16_compare(float16, float16, float_status *status);
int float16_compare_quiet(float16, float16, float_status *status);