Retro68/gcc/newlib/libm/machine/spu/headers/sinf4.h
2012-03-27 01:51:53 +02:00

96 lines
4.2 KiB
C

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/* International Business Machines Corporation, */
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/* PROLOG END TAG zYx */
#ifdef __SPU__
#ifndef _SINF4_H_
#define _SINF4_H_ 1
#include <spu_intrinsics.h>
#include "cos_sin.h"
/*
* FUNCTION
* vector float _sind2(vector float angle)
*
* DESCRIPTION
* The _sinf4 function computes the sine of a vector of angles (expressed
* in radians) to an accuracy of a single precision floating point.
*
*/
static __inline vector float _sinf4(vector float angle)
{
vec_int4 octant;
vec_uint4 select;
vec_float4 cos, sin;
vec_float4 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_F(angle, octant);
/* Compute the cosine and sine of the range reduced input.
*/
COMPUTE_COS_SIN_F(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 sin no
* 1,2 45 to 135 cos no
* 3,4 135 to 225 sin yes
* 5,6 225 to 315 cos yes
* 7 315 to 360 sin no
*/
toggle_sign = (vec_float4)spu_sl(spu_and(octant, 4), 29);
select = spu_cmpeq(spu_and(octant, 2), 0);
answer = spu_xor(spu_sel(cos, sin, select), toggle_sign);
return (answer);
}
#endif /* _SINF4_H_ */
#endif /* __SPU__ */