newlib-cygwin/newlib/libm/machine/spu/headers/sincosd2.h

94 lines
4.1 KiB
C

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/* PROLOG END TAG zYx */
#ifdef __SPU__
#ifndef _SINCOSD2_H_
#define _SINCOSD2_H_ 1
#include <spu_intrinsics.h>
#include "cos_sin.h"
/*
* FUNCTION
* void _sincosd2(vector double x, vector double *sx, vector double *cx)
*
* DESCRIPTION
* The _sincosd2 function computes the sine and cosine of a vector of
* angles (expressed in radians) to an accuracy of a double precision
* floating point.
*
*
*/
static __inline void _sincosd2(vector double angle,
vector double *sinx,
vector double *cosx)
{
vec_int4 octant;
vec_ullong2 select;
vec_double2 cos, sin;
vec_double2 toggle_sign;
/* 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);
/*
* See the comments for the sind2 and cosd2 functions for an
* explanation of the following steps.
*/
octant = spu_shuffle(octant, octant, ((vec_uchar16) { 0,1,2,3, 0,1,2,3, 8,9,10,11, 8,9,10,11 }));
select = (vec_ullong2)spu_cmpeq(spu_and(octant, 2), 0);
toggle_sign = (vec_double2)spu_sl(spu_and(spu_add(octant, 2), 4), ((vec_uint4) { 29,32,29,32 }));
*cosx = spu_xor(spu_sel(sin, cos, select), toggle_sign);
toggle_sign = (vec_double2)spu_sl(spu_and(octant, 4), ((vec_uint4) { 29,32,29,32 }));
*sinx = spu_xor(spu_sel(cos, sin, select), toggle_sign);
return;
}
#endif /* _SINCOSD2_H_ */
#endif /* __SPU__ */