Am 08.08.2016 um 15:24 schrieb Martin Storsjö:
> ---
> The value 30 is a blind guesstimate of what's sensible; with that, I
> get log() returning values close to the real values (differing only in
> the third digit or so).
>
> I'm not sure exactly how the original logic for the number of rounds
> is supposed to work; with any value over 16, it will currently
> run 0 rounds and return 0.
> ---
> mingw-w64-crt/math/softmath/softmath_private.h | 6 ++
> 1 file changed, 6 insertions(+)
>
> diff --git a/mingw-w64-crt/math/softmath/softmath_private.h
> b/mingw-w64-crt/math/softmath/softmath_private.h
> index 72df747..401f7c6 100644
> --- a/mingw-w64-crt/math/softmath/softmath_private.h
> +++ b/mingw-w64-crt/math/softmath/softmath_private.h
> @@ -61,6 +61,9 @@ static inline double softmath_log(double x)
> else if (x < 0.0001)
> aprox = 32768;
>
> +if (aprox < 30)
> +aprox = 30;
> +
> for(n = 0; n < aprox; n++)
> {
> result += bsd__ieee754_pow((x - 1.0) / (x + 1.0), 2 * n + 1) * (1.0
> / (2.0 * n + 1.0));
> @@ -82,6 +85,9 @@ static inline float softmath_logf(float x)
> else if (x < 0.0001)
> aprox = 32768;
>
> +if (aprox < 30)
> +aprox = 30;
> +
> for(n = 0; n < aprox; n++)
> {
> result += bsd__ieee754_powf((x - 1.0) / (x + 1.0), 2 * n + 1) * (1.0
> / (2.0 * n + 1.0));
>
looks good
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