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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libm/] [machine/] [spu/] [headers/] [tanf4.h] - Rev 148
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/* -------------------------------------------------------------- */ /* (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 _TANF4_H_ #define _TANF4_H_ 1 #include <spu_intrinsics.h> #include "cos_sin.h" #include "divf4.h" /* * FUNCTION * vector float _tanf4(vector float angle) * * DESCRIPTION * The _tanf4 function computes the tangent of a vector of "angle"s * (expressed in radians) to an accuracy of single precision floating * point. * */ static __inline vector float _tanf4(vector float angle) { vec_int4 octant; vec_uint4 select; vec_float4 cos, sin; vec_float4 num, den; 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 the numerator, denominator, and sign * correction depending upon the octant of the original angle. * * octants angles numerator denominator sign toggle * ------- ------------ --------- ----------- ----------- * 0 0 to 45 sin cos no * 1,2 45 to 135 cos sin no,yes * 3,4 135 to 225 sin cos yes,no * 5,6 225 to 315 cos sin no,yes * 7 315 to 360 sin cos yes */ toggle_sign = (vec_float4)spu_sl(spu_and(octant, 2), 30); select = spu_cmpeq(spu_and(octant, 2), 0); num = spu_sel(cos, sin, select); den = spu_sel(sin, cos, select); answer = spu_xor(_divf4(num, den), toggle_sign); return (answer); } #endif /* _TANF4_H_ */ #endif /* __SPU__ */
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