131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
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/*
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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/s_sineh.c in Newlib. */
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#include "amdgcnmach.h"
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v64df v64df_exp_aux (v64df, v64di);
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v64si v64df_numtest (v64df);
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v64si v64df_ispos (v64df);
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static const double q[] = { -0.21108770058106271242e+7,
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0.36162723109421836460e+5,
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-0.27773523119650701667e+3 };
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static const double p[] = { -0.35181283430177117881e+6,
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-0.11563521196851768270e+5,
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-0.16375798202630751372e+3,
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-0.78966127417357099479 };
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static const double LNV = 0.6931610107421875000;
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static const double INV_V2 = 0.24999308500451499336;
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static const double V_OVER2_MINUS1 = 0.13830277879601902638e-4;
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#if defined (__has_builtin) && __has_builtin (__builtin_gcn_fabsv)
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DEF_VD_MATH_FUNC (v64df, sineh, v64df x, int cosineh)
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{
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const double WBAR = 18.55;
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FUNCTION_INIT (v64df);
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v64si sgn = VECTOR_INIT (0);
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v64di v_cosineh = VECTOR_INIT (cosineh ? -1L : 0L);
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/* Check for special values. */
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v64si num_type = v64df_numtest (x);
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VECTOR_IF (num_type == NAN, cond)
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errno = EDOM;
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VECTOR_RETURN (x, cond);
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VECTOR_ELSEIF (num_type == INF, cond)
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errno = ERANGE;
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VECTOR_RETURN (VECTOR_MERGE (VECTOR_INIT (z_infinity.d),
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VECTOR_INIT (-z_infinity.d),
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v64df_ispos (x)),
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cond);
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VECTOR_ENDIF
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v64df y = __builtin_gcn_fabsv (x);
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if (!cosineh)
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VECTOR_COND_MOVE (sgn, VECTOR_INIT (-1), x < 0.0);
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v64df res;
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VECTOR_IF (((y > 1.0) & ~v_cosineh) | v_cosineh, cond)
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VECTOR_IF2 (y > BIGX, cond2, cond)
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v64df w = y - LNV;
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/* Check for w > maximum here. */
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VECTOR_IF2 (w > BIGX, cond3, cond2)
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errno = ERANGE;
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VECTOR_RETURN (x, cond3);
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VECTOR_ENDIF
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v64df z = v64df_exp_aux (w, __mask);
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VECTOR_COND_MOVE (res, z * (V_OVER2_MINUS1 + 1.0),
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cond2 & (w > WBAR));
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VECTOR_ELSE2 (cond2, cond)
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v64df z = v64df_exp_aux (y, __mask);
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if (cosineh)
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VECTOR_COND_MOVE (res, (z + 1 / z) * 0.5, cond2);
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else
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VECTOR_COND_MOVE (res, (z - 1 / z) * 0.5, cond2);
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VECTOR_ENDIF
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VECTOR_COND_MOVE (res, -res, sgn);
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VECTOR_ELSE (cond)
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/* Check for y being too small. */
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VECTOR_IF2 (y < z_rooteps, cond2, cond);
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VECTOR_COND_MOVE (res, x, cond2);
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VECTOR_ELSE2 (cond2, cond)
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/* Calculate the Taylor series. */
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v64df f = x * x;
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v64df Q = ((f + q[2]) * f + q[1]) * f + q[0];
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v64df P = ((p[3] * f + p[2]) * f + p[1]) * f + p[0];
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v64df R = f * (P / Q);
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VECTOR_COND_MOVE (res, x + x * R, cond2);
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VECTOR_ENDIF
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VECTOR_ENDIF
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VECTOR_RETURN (res, NO_COND);
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FUNCTION_RETURN;
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}
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#endif
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