sincosf4.h

Newlib 嵌入式 C库 标准实现代码

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/* PROLOG END TAG zYx                                              */
#ifdef __SPU__
#ifndef _SINCOSF4_H_
#define _SINCOSF4_H_	1

#include <spu_intrinsics.h>

#include "cos_sin.h"

/*
 * FUNCTION
 *  vector void _sincosf4(vector float angle, vector float *sx, vector float *cx)
 *
 * DESCRIPTION
 *  The _sincosf4 function computes the sine and cosine of a vector of 
 *	angles (expressed in radians) to an accuracy of a single precision
 *	floating point.
 *
 */

static __inline void _sincosf4(vector float angle, 
                               vector float *sinx, 
                               vector float *cosx)
{

    vec_int4   octant;
    vec_uint4  select;
    vec_float4 cos, sin;
    vec_float4 toggle_sign;

    /* 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);

    select = spu_cmpeq(spu_and(octant, 2), 0);

    toggle_sign = (vec_float4)spu_sl(spu_and(octant, 4), 29);
    *sinx = spu_xor(spu_sel(cos, sin, select), toggle_sign);

    toggle_sign = (vec_float4)spu_sl(spu_and(spu_add(octant, 2), 4), 29);
    *cosx = spu_xor(spu_sel(sin, cos, select), toggle_sign);

    return;
}

#endif /* _SINCOSF4_H_ */
#endif /* __SPU__ */