diff options
Diffstat (limited to 'newlib/libm/machine/spu/headers/coshd2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/coshd2.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/coshd2.h b/newlib/libm/machine/spu/headers/coshd2.h new file mode 100644 index 000000000..e68d134fb --- /dev/null +++ b/newlib/libm/machine/spu/headers/coshd2.h @@ -0,0 +1,127 @@ +/* -------------------------------------------------------------- */ +/* (C)Copyright 2006,2007, */ +/* 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. */ +/* 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 _COSHD2_H_ +#define _COSHD2_H_ 1 + +#include <spu_intrinsics.h> + +#include "expd2.h" +#include "recipd2.h" + +/* + * FUNCTION + * vector float _coshd2(vector double angle) + * + * DESCRIPTION + * _coshd2 computes the hyperbolic cosines of a vector of angles + * (expressed in radians) to an accuracy of a double precision + * floating point. + */ +static __inline vector double _coshd2(vector double x) +{ + + // Coefficents for the power series + vec_double2 f02 = spu_splats(5.00000000000000000000E-1); // 1/(2!) + vec_double2 f04 = spu_splats(4.16666666666666666667E-2); // 1/(4!) + vec_double2 f06 = spu_splats(1.38888888888888888889E-3); // 1/(6!) + vec_double2 f08 = spu_splats(2.48015873015873015873E-5); // 1/(8!) + vec_double2 f10 = spu_splats(2.75573192239858906526E-7); // 1/(10!) + vec_double2 f12 = spu_splats(2.08767569878680989792E-9); // 1/(12!) + vec_double2 f14 = spu_splats(1.14707455977297247139E-11); // 1/(14!) + vec_double2 f16 = spu_splats(4.77947733238738529744E-14); // 1/(16!) + vec_double2 f18 = spu_splats(1.56192069685862264622E-16); // 1/(18!) + vec_double2 f20 = spu_splats(4.11031762331216485848E-19); // 1/(20!) + vec_double2 f22 = spu_splats(8.89679139245057328675E-22); // 1/(22!) + + // Check if the input is within the range [ -1.0 ... 1.0 ] + // If it is, we want to use the power series, otherwise + // we want to use the 0.5 * (e^x + e^-x) + + // round to float, check if within range. Results will be in + // slots 0 and 2, so we rotate right 4 bytes, and "or" with ourself + // to produce 64 bits of all 1's or 0's. + vec_uint4 use_exp = spu_cmpabsgt(spu_roundtf(x),spu_splats(1.0f)); + use_exp = spu_or(use_exp,spu_rlmaskqwbyte(use_exp,-4)); + + + // Perform the calculation of the power series using Horner's method + vec_double2 result; + vec_double2 x2 = spu_mul(x,x); + result = spu_madd(x2,f22,f20); + result = spu_madd(x2,result,f18); + result = spu_madd(x2,result,f16); + result = spu_madd(x2,result,f14); + result = spu_madd(x2,result,f12); + result = spu_madd(x2,result,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(1.0)); + + + // Perform calculation as a function of 0.5 * (e^x + e^-x) + vec_double2 ex = _expd2(x); + vec_double2 ex_inv = _recipd2(ex); + + vec_double2 r2= spu_add(ex,ex_inv); + r2 = spu_mul(r2,f02); // we can reuse f02 here + + + // Select either the power series or exp version + result = spu_sel(result,r2,(vec_ullong2)use_exp); + + return result; + +} + +#endif /* _COSHD2_H_ */ +#endif /* __SPU__ */ |