/* -------------------------------------------------------------- */
/* (C)Copyright 2007,2008, */
/* International Business Machines Corporation */
/* All Rights Reserved. */
/* */
/* Redistribution and use in source and binary forms, with or */
/* without modification, are permitted provided that the */
/* following conditions are met: */
/* - Redistributions of source code must retain the above copyright*/
/* notice, this list of conditions and the following disclaimer. */
/* - Redistributions in binary form must reproduce the above */
/* copyright notice, this list of conditions and the following */
/* disclaimer in the documentation and/or other materials */
/* provided with the distribution. */
/* - Neither the name of IBM Corporation nor the names of its */
/* contributors may be used to endorse or promote products */
/* derived from this software without specific prior written */
/* permission. */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */
/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */
/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */
/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */
/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */
/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */
/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/* 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__ */
