93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
/*
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* Copyright 2023 Siemens
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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/*
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* Copyright (c) 1994-2009 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the BSD License. This program is distributed in the hope that
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* it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
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* including the implied warranties of MERCHANTABILITY or FITNESS FOR
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* A PARTICULAR PURPOSE. A copy of this license is available at
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* http://www.opensource.org/licenses. Any Red Hat trademarks that are
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* incorporated in the source code or documentation are not subject to
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* the BSD License and may only be used or replicated with the express
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* permission of Red Hat, Inc.
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*/
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/*****************************************************************
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* The following routines are coded directly from the algorithms
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* and coefficients given in "Software Manual for the Elementary
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* Functions" by William J. Cody, Jr. and William Waite, Prentice
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* Hall, 1980.
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*****************************************************************/
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/* Based on newlib/libm/mathfp/sf_tanh.c in Newlib. */
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#include "amdgcnmach.h"
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v64sf v64sf_expf_aux (v64sf, v64si);
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static const float LN3_OVER2 = 0.54930614433405484570;
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static const float p[] = { -0.16134119023996228053e+4,
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-0.99225929672236083313e+2,
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-0.96437492777225469787 };
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static const float q[] = { 0.48402357071988688686e+4,
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0.22337720718962312926e+4,
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0.11274474380534949335e+3 };
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#if defined (__has_builtin) && __has_builtin (__builtin_gcn_fabsvf)
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DEF_VS_MATH_FUNC (v64sf, tanhf, v64sf x)
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{
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FUNCTION_INIT (v64sf);
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v64sf f = __builtin_gcn_fabsvf (x);
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v64sf res;
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/* Check if the input is too big. */
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VECTOR_IF (f > (float) BIGX, cond)
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VECTOR_COND_MOVE (res, VECTOR_INIT (1.0f), cond);
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VECTOR_ELSEIF (f > LN3_OVER2, cond)
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VECTOR_COND_MOVE (res, 1.0f - 2.0f / (v64sf_expf_aux (2.0f * f, __mask) + 1.0f),
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cond);
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/* Check if the input is too small. */
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VECTOR_ELSEIF (f < z_rooteps_f, cond)
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VECTOR_COND_MOVE (res, f, cond);
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/* Calculate the Taylor series. */
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VECTOR_ELSE (cond)
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v64sf g = f * f;
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v64sf P = (p[2] * g + p[1]) * g + p[0];
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v64sf Q = ((g + q[2]) * g + q[1]) * g + q[0];
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v64sf R = g * (P / Q);
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VECTOR_COND_MOVE (res, f + f * R, cond);
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VECTOR_ENDIF
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VECTOR_COND_MOVE (res, -res, x < 0.0f);
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VECTOR_RETURN (res, NO_COND);
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FUNCTION_RETURN;
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}
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DEF_VARIANTS (tanhf, sf, sf)
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#endif
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