71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
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/* s_atanhl.c -- long double version of s_atan.c.
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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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/* __ieee754_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 <float.h>
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#include <math.h>
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#include <math-barriers.h>
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#include <math_private.h>
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#include <math-underflow.h>
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#include <libm-alias-finite.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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__ieee754_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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uint32_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<0x3fdf) {
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math_force_eval(huge+x);
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math_check_force_underflow (x);
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return x; /* x<2**-32 */
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}
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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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}
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libm_alias_finite (__ieee754_atanhl, __atanhl)
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