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/* PROLOG END TAG zYx */
#ifdef __SPU__
#ifndef _COSD2_H_
#define _COSD2_H_ 1
#include <spu_intrinsics.h>
#include "cos_sin.h"
/*
* FUNCTION
* vector double _cosd2(vector double angle)
*
* DESCRIPTION
* _cosd2 computes the cosine of a vector of angles (expressed
* in radians) to an accuracy of a double precision floating point.
*/
static __inline vector double _cosd2(vector double angle)
{
vec_int4 octant;
vec_ullong2 select;
vec_double2 cos, sin;
vec_double2 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(angle, octant);
/* Compute the cosine and sine of the range reduced input.
COMPUTE_COS_SIN(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
octant = spu_shuffle(octant, octant, ((vec_uchar16) { 0,1, 2, 3, 0,1, 2, 3, 8,9,10,11, 8,9,10,11 }));
toggle_sign = (vec_double2)spu_sl(spu_and(spu_add(octant, 2), 4), ((vec_uint4) { 29,32,29,32 }));
select = (vec_ullong2)spu_cmpeq(spu_and(octant, 2), 0);
answer = spu_xor(spu_sel(sin, cos, select), toggle_sign);
return (answer);
}
#endif /* _COSD2_H_ */
#endif /* __SPU__ */
