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39 /* -------------------------------------------------------------- */
40 /* PROLOG END TAG zYx */
41 #ifdef __SPU__
42 #ifndef _LOGD2_H_
43 #define _LOGD2_H_ 1
44
45 #include <spu_intrinsics.h>
46 #include "simdmath.h"
47 #include "log2d2.h"
48
49
50 /*
51 * FUNCTION
52 * vector double _logd2(vector double x)
53 *
54 * DESCRIPTION
55 * The _logd2 function computes the natural log for each double word
56 * element of the input x. _logd2 is computed using log2d2 as follows:
57 *
58 * logd2(x) = log2d2(x) / log2d2(e) = log2d2(x) * logd2(2)
59 *
60 */
_logd2(vector double x)61 static __inline vector double _logd2(vector double x)
62 {
63 return (spu_mul(_log2d2(x), spu_splats(SM_LN2)));
64 }
65
66 #endif /* _LOGD2_H_ */
67 #endif /* __SPU__ */
68
