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jeremybenn |
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/* (C)Copyright 2001,2008, */
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/* International Business Machines Corporation, */
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/* Sony Computer Entertainment, Incorporated, */
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/* Toshiba Corporation, */
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/* */
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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 _TANF4_H_
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#define _TANF4_H_ 1
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#include <spu_intrinsics.h>
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#include "cos_sin.h"
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#include "divf4.h"
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/*
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* FUNCTION
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* vector float _tanf4(vector float angle)
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*
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* DESCRIPTION
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* The _tanf4 function computes the tangent of a vector of "angle"s
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* (expressed in radians) to an accuracy of single precision floating
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* point.
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*
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*/
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static __inline vector float _tanf4(vector float angle)
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{
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vec_int4 octant;
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vec_uint4 select;
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vec_float4 cos, sin;
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vec_float4 num, den;
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vec_float4 toggle_sign, answer;
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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_F(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_F(angle, cos, sin);
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/* For each SIMD element, select the numerator, denominator, and sign
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* correction depending upon the octant of the original angle.
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*
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* octants angles numerator denominator sign toggle
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* ------- ------------ --------- ----------- -----------
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* 0 0 to 45 sin cos no
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* 1,2 45 to 135 cos sin no,yes
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* 3,4 135 to 225 sin cos yes,no
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* 5,6 225 to 315 cos sin no,yes
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* 7 315 to 360 sin cos yes
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*/
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toggle_sign = (vec_float4)spu_sl(spu_and(octant, 2), 30);
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select = spu_cmpeq(spu_and(octant, 2), 0);
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num = spu_sel(cos, sin, select);
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den = spu_sel(sin, cos, select);
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answer = spu_xor(_divf4(num, den), toggle_sign);
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return (answer);
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}
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#endif /* _TANF4_H_ */
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#endif /* __SPU__ */
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