76 lines
2.2 KiB
C
76 lines
2.2 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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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*
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*/
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/* Based on newlib/libm/mathfp/e_atanh.c in Newlib. */
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#include "amdgcnmach.h"
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v64df v64df_log1p_aux (v64df, v64di);
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DEF_VD_MATH_FUNC (v64df, atanh, v64df x)
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{
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static const double zero = 0.0;
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static const double one = 1.0, huge = 1e300;
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FUNCTION_INIT (v64df);
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v64df t;
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v64si hx, lx;
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EXTRACT_WORDS (hx, lx, x);
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v64si ix = hx & 0x7fffffff;
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VECTOR_IF ((ix | ((lx | (-lx)) >> 31)) > 0x3ff00000, cond) // |x|>1
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VECTOR_RETURN ((x - x)/(x - x), cond);
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VECTOR_ENDIF
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VECTOR_IF (ix == 0x3ff00000, cond)
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VECTOR_RETURN (x / zero, cond);
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VECTOR_ENDIF
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VECTOR_IF ((ix < 0x3e300000) & __builtin_convertvector((huge + x) > zero, v64si), cond) // x<2**-28
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VECTOR_RETURN (x, cond);
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VECTOR_ENDIF
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SET_HIGH_WORD (x, ix, NO_COND);
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VECTOR_IF (ix < 0x3fe00000, cond) // x < 0.5 */
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v64df t2 = x + x;
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VECTOR_COND_MOVE (t, 0.5 * v64df_log1p_aux (t2 + t2 * x / (one - x), __mask), cond);
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VECTOR_ELSE (cond)
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VECTOR_COND_MOVE (t, 0.5 * v64df_log1p_aux ((x + x) / (one - x), __mask), cond);
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VECTOR_ENDIF
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VECTOR_IF (hx >= 0, cond)
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VECTOR_RETURN (t, cond);
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VECTOR_ELSE (cond)
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VECTOR_RETURN (-t, cond);
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VECTOR_ENDIF
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FUNCTION_RETURN;
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}
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DEF_VARIANTS (atanh, df, df)
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