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Optimize linear interpolation function

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Vesa
2014-04-05 01:18:15 +03:00
parent 647240624d
commit 5ced0c083f
1 changed files with 9 additions and 3 deletions
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12
include/interpolation.h
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@@ -23,8 +23,8 @@
*/
#ifndef _INTERPOLATION_H
#define _INTERPOLATION_H
#ifndef INTERPOLATION_H
#define INTERPOLATION_H
#ifndef __USE_XOPEN
#define __USE_XOPEN
@@ -87,7 +87,13 @@ inline float cosinusInterpolate( float v0, float v1, float x )
inline float linearInterpolate( float v0, float v1, float x )
{
return( v0*( 1.0f-x ) + v1*x );
// take advantage of fma function if present in hardware
#ifdef FP_FAST_FMAF
return fmaf( x, v1-v0, v0 );
#else
return x * (v1-v0) + v0;
#endif
}