e_atanh.c (5aa554c7e5b6fd9042986df07f12ac5687e41392) e_atanh.c (998b640bcbca4ff197daf30fcff18d33889a7a0b)
1
2/* @(#)e_atanh.c 1.3 95/01/18 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunSoft, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this

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28 *
29 * Special cases:
30 * atanh(x) is NaN if |x| > 1 with signal;
31 * atanh(NaN) is that NaN with no signal;
32 * atanh(+-1) is +-INF with signal.
33 *
34 */
35
1
2/* @(#)e_atanh.c 1.3 95/01/18 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunSoft, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this

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28 *
29 * Special cases:
30 * atanh(x) is NaN if |x| > 1 with signal;
31 * atanh(NaN) is that NaN with no signal;
32 * atanh(+-1) is +-INF with signal.
33 *
34 */
35
36#include <float.h>
37
36#include "math.h"
37#include "math_private.h"
38
39static const double one = 1.0, huge = 1e300;
40static const double zero = 0.0;
41
42double
43__ieee754_atanh(double x)

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55 SET_HIGH_WORD(x,ix);
56 if(ix<0x3fe00000) { /* x < 0.5 */
57 t = x+x;
58 t = 0.5*log1p(t+t*x/(one-x));
59 } else
60 t = 0.5*log1p((x+x)/(one-x));
61 if(hx>=0) return t; else return -t;
62}
38#include "math.h"
39#include "math_private.h"
40
41static const double one = 1.0, huge = 1e300;
42static const double zero = 0.0;
43
44double
45__ieee754_atanh(double x)

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57 SET_HIGH_WORD(x,ix);
58 if(ix<0x3fe00000) { /* x < 0.5 */
59 t = x+x;
60 t = 0.5*log1p(t+t*x/(one-x));
61 } else
62 t = 0.5*log1p((x+x)/(one-x));
63 if(hx>=0) return t; else return -t;
64}
65
66#if LDBL_MANT_DIG == 53
67__weak_reference(atanh, atanhl);
68#endif