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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [machine/] [spu/] [headers/] [tanf4.h] - Blame information for rev 207

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1 207 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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/* without modification, are permitted provided that the           */
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/*   notice, this list of conditions and the following disclaimer. */
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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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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND          */
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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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/* 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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