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jeremybenn |
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/* (C)Copyright 2007,2008, */
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/* International Business Machines Corporation */
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/* All Rights Reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or */
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/* without modification, are permitted provided that the */
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/* following conditions are met: */
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/* */
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/* - Redistributions of source code must retain the above copyright*/
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/* notice, this list of conditions and the following disclaimer. */
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/* */
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/* - Redistributions in binary form must reproduce the above */
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/* copyright notice, this list of conditions and the following */
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/* disclaimer in the documentation and/or other materials */
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/* provided with the distribution. */
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/* */
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/* - Neither the name of IBM Corporation nor the names of its */
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/* contributors may be used to endorse or promote products */
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/* derived from this software without specific prior written */
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/* permission. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */
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/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */
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/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
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/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
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/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */
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/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
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/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */
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/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
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/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */
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/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
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/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */
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/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
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/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* -------------------------------------------------------------- */
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/* PROLOG END TAG zYx */
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#ifdef __SPU__
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#ifndef _SINCOSD2_H_
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#define _SINCOSD2_H_ 1
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#include <spu_intrinsics.h>
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#include "cos_sin.h"
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/*
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* FUNCTION
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* void _sincosd2(vector double x, vector double *sx, vector double *cx)
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*
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* DESCRIPTION
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* The _sincosd2 function computes the sine and cosine of a vector of
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* angles (expressed in radians) to an accuracy of a double precision
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* floating point.
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*
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*
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*/
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static __inline void _sincosd2(vector double angle,
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vector double *sinx,
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vector double *cosx)
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{
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vec_int4 octant;
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vec_ullong2 select;
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vec_double2 cos, sin;
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vec_double2 toggle_sign;
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/* Range reduce the input angle x into the range -PI/4 to PI/4
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* by performing simple modulus.
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*/
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MOD_PI_OVER_FOUR(angle, octant);
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/* Compute the cosine and sine of the range reduced input.
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*/
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COMPUTE_COS_SIN(angle, cos, sin);
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/*
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* See the comments for the sind2 and cosd2 functions for an
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* explanation of the following steps.
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*/
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octant = spu_shuffle(octant, octant, ((vec_uchar16) { 0,1,2,3, 0,1,2,3, 8,9,10,11, 8,9,10,11 }));
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select = (vec_ullong2)spu_cmpeq(spu_and(octant, 2), 0);
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toggle_sign = (vec_double2)spu_sl(spu_and(spu_add(octant, 2), 4), ((vec_uint4) { 29,32,29,32 }));
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*cosx = spu_xor(spu_sel(sin, cos, select), toggle_sign);
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toggle_sign = (vec_double2)spu_sl(spu_and(octant, 4), ((vec_uint4) { 29,32,29,32 }));
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*sinx = spu_xor(spu_sel(cos, sin, select), toggle_sign);
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return;
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}
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#endif /* _SINCOSD2_H_ */
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#endif /* __SPU__ */
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