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40 /* PROLOG END TAG zYx */
41 #ifdef __SPU__
42 #ifndef _SIND2_H_
43 #define _SIND2_H_ 1
44
45 #include <spu_intrinsics.h>
46 #include "cos_sin.h"
47
48 /*
49 * FUNCTION
50 * vector double _sind2(vector double angle)
51 *
52 * DESCRIPTION
53 * The _sind2 function computes the sine of a vector of angles (expressed
54 * in radians) to an accuracy of a double precision floating point.
55 *
56 */
_sind2(vector double angle)57 static __inline vector double _sind2(vector double angle)
58 {
59 vec_int4 octant;
60 vec_ullong2 select;
61 vec_double2 cos, sin;
62 vec_double2 toggle_sign, answer;
63
64 /* Range reduce the input angle x into the range -PI/4 to PI/4
65 * by performing simple modulus.
66 */
67 MOD_PI_OVER_FOUR(angle, octant);
68
69 /* Compute the cosine and sine of the range reduced input.
70 */
71 COMPUTE_COS_SIN(angle, cos, sin);
72
73 /* For each SIMD element, select which result (cos or sin) to use
74 * with a sign correction depending upon the octant of the original
75 * angle (Maclaurin series).
76 *
77 * octants angles select sign toggle
78 * ------- ------------ ------ -----------
79 * 0 0 to 45 sin no
80 * 1,2 45 to 135 cos no
81 * 3,4 135 to 225 sin yes
82 * 5,6 225 to 315 sin yes
83 * 7 315 to 360 cos no
84 */
85 octant = spu_shuffle(octant, octant, ((vec_uchar16) {
86 0,1, 2, 3, 0,1, 2, 3,
87 8,9,10,11, 8,9,10,11 } ));
88
89 toggle_sign = (vec_double2)spu_sl(spu_and(octant, 4), ((vec_uint4) { 29,32,29,32 }));
90 select = (vec_ullong2)spu_cmpeq(spu_and(octant, 2), 0);
91
92 answer = spu_xor(spu_sel(cos, sin, select), toggle_sign);
93
94 return (answer);
95 }
96
97 #endif /* _SIND2_H_ */
98 #endif /* __SPU__ */
99
