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| /* PROLOG END TAG zYx */ |
| #ifdef __SPU__ |
| |
| #ifndef _COSF4_H_ |
| #define _COSF4_H_ 1 |
| |
| |
| #include <spu_intrinsics.h> |
| |
| #include "cos_sin.h" |
| |
| /* |
| * FUNCTION |
| * vector float _cosf4(vector float angle) |
| * |
| * DESCRIPTION |
| * The _cosf4 function computes the cosine of a vector of angles |
| * (expressed in radians) to an accuracy of single precision floating |
| * point. |
| * |
| */ |
| static __inline vector float _cosf4(vector float angle) |
| { |
| vec_int4 octant; |
| vec_uint4 select; |
| vec_float4 cos, sin; |
| vec_float4 toggle_sign, answer; |
| |
| /* Range reduce the input angle x into the range -PI/4 to PI/4 |
| * by performing simple modulus. |
| */ |
| MOD_PI_OVER_FOUR_F(angle, octant); |
| |
| /* Compute the cosine and sine of the range reduced input. |
| */ |
| COMPUTE_COS_SIN_F(angle, cos, sin); |
| |
| /* For each SIMD element, select which result (cos or sin) to use |
| * with a sign correction depending upon the octant of the original |
| * angle (Maclaurin series). |
| * |
| * octants angles select sign toggle |
| * ------- ------------ ------ ----------- |
| * 0 0 to 45 cos no |
| * 1,2 45 to 135 sin yes |
| * 3,4 135 to 225 cos yes |
| * 5,6 225 to 315 sin no |
| * 7 315 to 360 cos no |
| */ |
| toggle_sign = (vec_float4)spu_sl(spu_and(spu_add(octant, 2), 4), 29); |
| select = spu_cmpeq(spu_and(octant, 2), 0); |
| |
| answer = spu_xor(spu_sel(sin, cos, select), toggle_sign); |
| |
| return (answer); |
| |
| } |
| |
| #endif /* _COSF4_H_ */ |
| #endif /* __SPU__ */ |
