diff options
| author | Michal Krol <michal@tungstengraphics.com> | 2008-11-12 19:01:46 +0100 |
|---|---|---|
| committer | Michal Krol <michal@tungstengraphics.com> | 2008-11-12 19:01:46 +0100 |
| commit | c5ba8ba9182a6946ee489241738457b1370b3c77 (patch) | |
| tree | 239d86d30222d0d75fbba2571c9b5d4509a536b2 /src/gallium/auxiliary/util/u_math.h | |
| parent | 87f77105ce7207d601ee95bc29ca8c0ea1731d78 (diff) | |
util: Optimise log2().
Diffstat (limited to 'src/gallium/auxiliary/util/u_math.h')
| -rw-r--r-- | src/gallium/auxiliary/util/u_math.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h index 62272110ce..fdaec8df82 100644 --- a/src/gallium/auxiliary/util/u_math.h +++ b/src/gallium/auxiliary/util/u_math.h @@ -163,7 +163,8 @@ static INLINE float logf( float f ) static INLINE double log2( double x ) { - return log( x ) / log( 2.0 ); + const double invln2 = 1.442695041; + return log( x ) * invln2; } #else |