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39 /* -------------------------------------------------------------- */
40 /* PROLOG END TAG zYx */
41 #ifdef __SPU__
42 #ifndef _SINF4_H_
43 #define _SINF4_H_ 1
44
45 #include <spu_intrinsics.h>
46
47 #include "cos_sin.h"
48
49 /*
50 * FUNCTION
51 * vector float _sind2(vector float angle)
52 *
53 * DESCRIPTION
54 * The _sinf4 function computes the sine of a vector of angles (expressed
55 * in radians) to an accuracy of a single precision floating point.
56 *
57 */
_sinf4(vector float angle)58 static __inline vector float _sinf4(vector float angle)
59 {
60 vec_int4 octant;
61 vec_uint4 select;
62 vec_float4 cos, sin;
63 vec_float4 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_F(angle, octant);
69
70 /* Compute the cosine and sine of the range reduced input.
71 */
72 COMPUTE_COS_SIN_F(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 sin no
81 * 1,2 45 to 135 cos no
82 * 3,4 135 to 225 sin yes
83 * 5,6 225 to 315 cos yes
84 * 7 315 to 360 sin no
85 */
86 toggle_sign = (vec_float4)spu_sl(spu_and(octant, 4), 29);
87 select = spu_cmpeq(spu_and(octant, 2), 0);
88
89 answer = spu_xor(spu_sel(cos, sin, select), toggle_sign);
90
91 return (answer);
92 }
93
94 #endif /* _SINF4_H_ */
95 #endif /* __SPU__ */
96
