mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-28 05:51:04 +00:00
98 lines
4.3 KiB
C
98 lines
4.3 KiB
C
/* -------------------------------------------------------------- */
|
|
/* (C)Copyright 2001,2008, */
|
|
/* International Business Machines Corporation, */
|
|
/* Sony Computer Entertainment, Incorporated, */
|
|
/* Toshiba 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 _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__ */
|