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39 /* -------------------------------------------------------------- */
40 /* PROLOG END TAG zYx */
41 #ifdef __SPU__
42
43 #ifndef _COSF4_H_
44 #define _COSF4_H_ 1
45
46
47 #include <spu_intrinsics.h>
48
49 #include "cos_sin.h"
50
51 /*
52 * FUNCTION
53 * vector float _cosf4(vector float angle)
54 *
55 * DESCRIPTION
56 * The _cosf4 function computes the cosine of a vector of angles
57 * (expressed in radians) to an accuracy of single precision floating
58 * point.
59 *
60 */
_cosf4(vector float angle)61 static __inline vector float _cosf4(vector float angle)
62 {
63 vec_int4 octant;
64 vec_uint4 select;
65 vec_float4 cos, sin;
66 vec_float4 toggle_sign, answer;
67
68 /* Range reduce the input angle x into the range -PI/4 to PI/4
69 * by performing simple modulus.
70 */
71 MOD_PI_OVER_FOUR_F(angle, octant);
72
73 /* Compute the cosine and sine of the range reduced input.
74 */
75 COMPUTE_COS_SIN_F(angle, cos, sin);
76
77 /* For each SIMD element, select which result (cos or sin) to use
78 * with a sign correction depending upon the octant of the original
79 * angle (Maclaurin series).
80 *
81 * octants angles select sign toggle
82 * ------- ------------ ------ -----------
83 * 0 0 to 45 cos no
84 * 1,2 45 to 135 sin yes
85 * 3,4 135 to 225 cos yes
86 * 5,6 225 to 315 sin no
87 * 7 315 to 360 cos no
88 */
89 toggle_sign = (vec_float4)spu_sl(spu_and(spu_add(octant, 2), 4), 29);
90 select = spu_cmpeq(spu_and(octant, 2), 0);
91
92 answer = spu_xor(spu_sel(sin, cos, select), toggle_sign);
93
94 return (answer);
95
96 }
97
98 #endif /* _COSF4_H_ */
99 #endif /* __SPU__ */
100
