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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libm/] [machine/] [spu/] [headers/] [coshf4.h] - Rev 158
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/* -------------------------------------------------------------- */ /* (C)Copyright 2006,2008, */ /* 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 _COSHF4_H_ #define _COSHF4_H_ 1 #include <spu_intrinsics.h> #include "expf4.h" #include "recipf4.h" /* * FUNCTION * vector float _coshf4(vector float x) * * DESCRIPTION * The _coshf4 function computes the hyperbolic cosines of a vector of * angles (expressed in radians) to an accuracy of a single precision * floating point. * */ static __inline vector float _coshf4(vector float x) { // 1.0000 (above this number, use sinh(x) = 0.5 * (e^x - e^-x) vec_uint4 threshold = (vec_uint4)spu_splats(0x3F800000); vec_uint4 sign_mask = (vec_uint4)spu_splats(0x80000000); // Coefficents for the Taylor series vec_float4 f02 = spu_splats(5.0000000000000000E-1f); // 1/2! vec_float4 f04 = spu_splats(4.1666666666666667E-2f); // 1/4! vec_float4 f06 = spu_splats(1.3888888888888889E-3f); // 1/6! vec_float4 f08 = spu_splats(2.4801587301587302E-5f); // 1/8! vec_float4 f10 = spu_splats(2.7557319223985891E-7f); // 1/10! vec_float4 f12 = spu_splats(2.0876756987868099E-9f); // 1/12! // Perform the calculation as a Taylor series vec_float4 result; vector float x2 = spu_mul(x,x); result = spu_madd(x2,f12,f10); result = spu_madd(x2,result,f08); result = spu_madd(x2,result,f06); result = spu_madd(x2,result,f04); result = spu_madd(x2,result,f02); result = spu_madd(x2,result,spu_splats(1.0f)); // Perform calculation as a function of 0.5 * (e^x - e^-x) vec_float4 ex = _expf4(x); vec_float4 ex_inv = _recipf4(ex); vec_float4 r2= spu_add(ex,ex_inv); r2 = spu_mul(r2,f02); // we can reused f02 here vec_uint4 xabs = spu_andc((vec_uint4)x,sign_mask); vec_uint4 use_exp = spu_cmpgt(xabs,threshold); // Select either the Taylor or exp version result = spu_sel(result,r2,use_exp); return result; } #endif /* _COSHF4_H_ */ #endif /* __SPU__ */