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Diffstat (limited to 'newlib/libm/machine/spu/headers/tanhd2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/tanhd2.h | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/newlib/libm/machine/spu/headers/tanhd2.h b/newlib/libm/machine/spu/headers/tanhd2.h deleted file mode 100644 index 654cd99e9..000000000 --- a/newlib/libm/machine/spu/headers/tanhd2.h +++ /dev/null @@ -1,161 +0,0 @@ -/* -------------------------------------------------------------- */ -/* (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 _TANHD2_H_ -#define _TANHD2_H_ 1 - -#include <spu_intrinsics.h> - -#include "expd2.h" -#include "divd2.h" - - -/* - * Taylor coefficients for tanh - */ -#define TANH_TAY01 1.000000000000000000000000000000E0 -#define TANH_TAY02 -3.333333333333333333333333333333E-1 -#define TANH_TAY03 1.333333333333333333333333333333E-1 -#define TANH_TAY04 -5.396825396825396825396825396825E-2 -#define TANH_TAY05 2.186948853615520282186948853616E-2 -#define TANH_TAY06 -8.863235529902196568863235529902E-3 -#define TANH_TAY07 3.592128036572481016925461369906E-3 -#define TANH_TAY08 -1.455834387051318268249485180702E-3 -#define TANH_TAY09 5.900274409455859813780759937000E-4 -#define TANH_TAY10 -2.391291142435524814857314588851E-4 -#define TANH_TAY11 9.691537956929450325595875000389E-5 -#define TANH_TAY12 -3.927832388331683405337080809312E-5 -#define TANH_TAY13 1.591890506932896474074427981657E-5 -#define TANH_TAY14 -6.451689215655430763190842315303E-6 -#define TANH_TAY15 2.614771151290754554263594256410E-6 -#define TANH_TAY16 -1.059726832010465435091355394125E-6 -#define TANH_TAY17 4.294911078273805854820351280397E-7 - - -/* - * FUNCTION - * vector double _tanhd2(vector double x) - * - * DESCRIPTION - * The _tanhd2 function computes the hyperbolic tangent for each - * element of the input vector. - * - * We use the following to approximate tanh: - * - * |x| <= .25: Taylor Series - * |x| > .25: tanh(x) = (exp(2x) - 1)/(exp(2x) + 1) - * - * - * SPECIAL CASES: - * - tanh(+/- 0) = +/-0 - * - tanh(+/- infinity) = +/- 1 - * - tanh(NaN) = NaN - * - */ - -static __inline vector double _tanhd2(vector double x) -{ - vector double signbit = spu_splats(-0.0); - vector double oned = spu_splats(1.0); - vector double twod = spu_splats(2.0); - vector double infd = (vector double)spu_splats(0x7FF0000000000000ull); - vector double xabs; - vector double x2; - vector unsigned long long gttaylor; - vector double e; - vector double tresult; - vector double eresult; - vector double result; - - xabs = spu_andc(x, signbit); - - /* - * This is where we switch from Taylor Series - * to exponential formula. - */ - gttaylor = spu_cmpgt(xabs, spu_splats(0.25)); - - - /* - * Taylor Series Approximation - */ - x2 = spu_mul(x,x); - tresult = spu_madd(x2, spu_splats(TANH_TAY11), spu_splats(TANH_TAY10)); - tresult = spu_madd(x2, tresult, spu_splats(TANH_TAY09)); - tresult = spu_madd(x2, tresult, spu_splats(TANH_TAY08)); - tresult = spu_madd(x2, tresult, spu_splats(TANH_TAY07)); - tresult = spu_madd(x2, tresult, spu_splats(TANH_TAY06)); - tresult = spu_madd(x2, tresult, spu_splats(TANH_TAY05)); - tresult = spu_madd(x2, tresult, spu_splats(TANH_TAY04)); - tresult = spu_madd(x2, tresult, spu_splats(TANH_TAY03)); - tresult = spu_madd(x2, tresult, spu_splats(TANH_TAY02)); - tresult = spu_madd(x2, tresult, spu_splats(TANH_TAY01)); - tresult = spu_mul(xabs, tresult); - - - /* - * Exponential Formula - * Our expd2 function gives a more accurate result in general - * with xabs instead of x for x<0. We correct for sign later. - */ - e = _expd2(spu_mul(xabs, twod)); - eresult = _divd2(spu_sub(e, oned), spu_add(e, oned)); - - - /* - * Select Taylor or exp result. - */ - result = spu_sel(tresult, eresult, gttaylor); - - /* - * Inf and NaN special cases. NaN is already in result - * for x = NaN. - */ - result = spu_sel(result, oned, spu_cmpeq(xabs, infd)); - - /* - * Antisymmetric function - preserve sign bit of x - * in the result. - */ - result = spu_sel(result, x, (vec_ullong2)signbit); - - return result; -} - -#endif /* _TANHD2_H_ */ -#endif /* __SPU__ */ |