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/* @(#)e_atanh.c 5.1 93/09/24 */ |
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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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/* atanhl(x) |
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* Method : |
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* 1.Reduced x to positive by atanh(-x) = -atanh(x) |
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* 2.For x>=0.5 |
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* 1 2x x |
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* atanhl(x) = --- * log(1 + -------) = 0.5 * log1p(2 * --------) |
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* 2 1 - x 1 - x |
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* |
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* For x<0.5 |
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* atanhl(x) = 0.5*log1pl(2x+2x*x/(1-x)) |
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* |
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* Special cases: |
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* atanhl(x) is NaN if |x| > 1 with signal; |
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* atanhl(NaN) is that NaN with no signal; |
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* atanhl(+-1) is +-INF with signal. |
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* |
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*/ |
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#include <math.h> |
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#include "math_private.h" |
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static const long double one = 1.0, huge = 1e4900L; |
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static const long double zero = 0.0; |
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long double |
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atanhl(long double x) |
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{ |
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long double t; |
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int32_t ix; |
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u_int32_t se,i0,i1; |
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GET_LDOUBLE_WORDS(se,i0,i1,x); |
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ix = se&0x7fff; |
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if ((ix+((((i0&0x7fffffff)|i1)|(-((i0&0x7fffffff)|i1)))>>31))>0x3fff) |
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/* |x|>1 */ |
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return (x-x)/(x-x); |
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if(ix==0x3fff) |
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return x/zero; |
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if(ix<0x3fe3&&(huge+x)>zero) return x; /* x<2**-28 */ |
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SET_LDOUBLE_EXP(x,ix); |
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if(ix<0x3ffe) { /* x < 0.5 */ |
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t = x+x; |
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t = 0.5*log1pl(t+t*x/(one-x)); |
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} else |
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t = 0.5*log1pl((x+x)/(one-x)); |
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if(se<=0x7fff) return t; else return -t; |
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} |