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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [machine/] [spu/] [headers/] [atan2d2.h] - Rev 207
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/* -------------------------------------------------------------- */ /* (C)Copyright 2007,2008, */ /* International Business Machines 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 _ATAN2D2_H_ #define _ATAN2D2_H_ 1 #include <spu_intrinsics.h> #include "divd2.h" #include "atand2.h" /* * FUNCTION * vector double _atan2d2(vector double y, vector double x) * * DESCRIPTION * The atan2d2 function returns a vector containing the angles * whose tangets are y/x for the corresponding elements of the * input vectors. * * The reason this function exists is to use the signs of the * arguments to determine the quadrant of the result. Consider * sin(x)/cos(x) on the domain (-pi, pi]. Four quadrants are * defined by the signs of sin and cos on this domain. * * Special Cases: * - If the corresponding elements of x and y are zero, the * resulting element is undefined. * */ static __inline vector double _atan2d2(vector double y, vector double x) { vec_uchar16 dup_even = ((vec_uchar16) { 0,1,2,3, 0,1,2,3, 8,9,10,11, 8,9,10,11 }); vector double pi = spu_splats(SM_PI); vector unsigned long long ones = spu_splats(0xFFFFFFFFFFFFFFFFull); vector unsigned long long quad1; vector unsigned long long quad4; vector double result; vector unsigned long long xlt0; vector unsigned long long yge0; vector unsigned long long ylt0; xlt0 = (vec_ullong2)spu_rlmaska((vec_int4)spu_shuffle(x,x,dup_even), 31); ylt0 = (vec_ullong2)spu_rlmaska((vec_int4)spu_shuffle(y,y,dup_even), 31); yge0 = spu_xor(ylt0, ones); quad1 = spu_and(ylt0, xlt0); quad4 = spu_and(yge0, xlt0); result = _atand2(_divd2(y,x)); result = spu_sel(result, spu_sub(result, pi), quad1); result = spu_sel(result, spu_add(result, pi), quad4); return result; } #endif /* _ATAN2D2_H_ */ #endif /* __SPU__ */