Retro68/gcc/newlib/libm/machine/spu/headers/logf4.h
2012-03-27 01:51:53 +02:00

65 lines
3.2 KiB
C

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/* PROLOG END TAG zYx */
#ifdef __SPU__
#ifndef _LOGF4_H_
#define _LOGF4_H_ 1
#include "log2f4.h"
/*
* FUNCTION
* vector float _logf4(vector float x)
*
* DESCRIPTION
* The _logf4 function computes the natural log (base e) of the input
* vector of values x. logf4 is computed using log2f4 as follows:
*
* logf4(x) = log2f4(x) / log2f4(e);
*
*/
static __inline vector float _logf4(vector float x)
{
return (spu_mul(_log2f4(x), spu_splats(0.69314718055995f)));
}
#endif /* _LOGF4_H_ */
#endif /* __SPU__ */