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39 /* -------------------------------------------------------------- */
40 /* PROLOG END TAG zYx */
41 #ifdef __SPU__
42 #ifndef _LOGF4_H_
43 #define _LOGF4_H_ 1
44
45 #include "log2f4.h"
46
47 /*
48 * FUNCTION
49 * vector float _logf4(vector float x)
50 *
51 * DESCRIPTION
52 * The _logf4 function computes the natural log (base e) of the input
53 * vector of values x. logf4 is computed using log2f4 as follows:
54 *
55 * logf4(x) = log2f4(x) / log2f4(e);
56 *
57 */
_logf4(vector float x)58 static __inline vector float _logf4(vector float x)
59 {
60 return (spu_mul(_log2f4(x), spu_splats(0.69314718055995f)));
61 }
62
63 #endif /* _LOGF4_H_ */
64 #endif /* __SPU__ */
65
