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39 /* -------------------------------------------------------------- */
40 /* PROLOG END TAG zYx */
41 #ifdef __SPU__
42
43 #ifndef _COSD2_H_
44 #define _COSD2_H_ 1
45
46 #include <spu_intrinsics.h>
47
48 #include "cos_sin.h"
49
50 /*
51 * FUNCTION
52 * vector double _cosd2(vector double angle)
53 *
54 * DESCRIPTION
55 * _cosd2 computes the cosine of a vector of angles (expressed
56 * in radians) to an accuracy of a double precision floating point.
57 */
_cosd2(vector double angle)58 static __inline vector double _cosd2(vector double angle)
59 {
60 vec_int4 octant;
61 vec_ullong2 select;
62 vec_double2 cos, sin;
63 vec_double2 toggle_sign, answer;
64
65 /* Range reduce the input angle x into the range -PI/4 to PI/4
66 * by performing simple modulus.
67 */
68 MOD_PI_OVER_FOUR(angle, octant);
69
70 /* Compute the cosine and sine of the range reduced input.
71 */
72 COMPUTE_COS_SIN(angle, cos, sin);
73
74 /* For each SIMD element, select which result (cos or sin) to use
75 * with a sign correction depending upon the octant of the original
76 * angle (Maclaurin series).
77 *
78 * octants angles select sign toggle
79 * ------- ------------ ------ -----------
80 * 0 0 to 45 cos no
81 * 1,2 45 to 135 sin yes
82 * 3,4 135 to 225 cos yes
83 * 5,6 225 to 315 sin no
84 * 7 315 to 360 cos no
85 */
86 octant = spu_shuffle(octant, octant, ((vec_uchar16) { 0,1, 2, 3, 0,1, 2, 3, 8,9,10,11, 8,9,10,11 }));
87
88 toggle_sign = (vec_double2)spu_sl(spu_and(spu_add(octant, 2), 4), ((vec_uint4) { 29,32,29,32 }));
89 select = (vec_ullong2)spu_cmpeq(spu_and(octant, 2), 0);
90
91 answer = spu_xor(spu_sel(sin, cos, select), toggle_sign);
92
93 return (answer);
94 }
95
96 #endif /* _COSD2_H_ */
97 #endif /* __SPU__ */
98
