util: Optimise log2().

2008-11-12 19:02:41 +01:00
parent f447eea4de
commit 0d8637451b
1 changed files with 2 additions and 1 deletions
@@ -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