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/* @(#)w_atanh.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */
 
/*
FUNCTION
        <<atanh>>, <<atanhf>>---inverse hyperbolic tangent
 
INDEX
        atanh
INDEX
        atanhf
 
ANSI_SYNOPSIS
        #include <math.h>
        double atanh(double <[x]>);
        float atanhf(float <[x]>);
 
TRAD_SYNOPSIS
        #include <math.h>
        double atanh(<[x]>)
        double <[x]>;
 
        float atanhf(<[x]>)
        float <[x]>;
 
DESCRIPTION
        <<atanh>> calculates the inverse hyperbolic tangent of <[x]>.
 
        <<atanhf>> is identical, other than taking and returning
        <<float>> values.
 
RETURNS
        <<atanh>> and <<atanhf>> return the calculated value.
 
        If
        @ifnottex
        |<[x]>|
        @end ifnottex
        @tex
        $|x|$
        @end tex
        is greater than 1, the global <<errno>> is set to <<EDOM>> and
        the result is a NaN.  A <<DOMAIN error>> is reported.
 
        If
        @ifnottex
        |<[x]>|
        @end ifnottex
        @tex
        $|x|$
        @end tex
        is 1, the global <<errno>> is set to <<EDOM>>; and the result is
        infinity with the same sign as <<x>>.  A <<SING error>> is reported.
 
        You can modify the error handling for these routines using
        <<matherr>>.
 
PORTABILITY
        Neither <<atanh>> nor <<atanhf>> are ANSI C.
 
QUICKREF
        atanh - pure
        atanhf - pure
 
 
*/
 
/*
 * wrapper atanh(x)
 */
 
#include "fdlibm.h"
#include <errno.h>
 
#ifndef _DOUBLE_IS_32BITS
 
#ifdef __STDC__
        double atanh(double x)          /* wrapper atanh */
#else
        double atanh(x)                 /* wrapper atanh */
        double x;
#endif
{
#ifdef _IEEE_LIBM
        return __ieee754_atanh(x);
#else
        double z,y;
        struct exception exc;
        z = __ieee754_atanh(x);
        if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
        y = fabs(x);
        if(y>=1.0) {
            if(y>1.0) {
                /* atanh(|x|>1) */
                exc.type = DOMAIN;
                exc.name = "atanh";
                exc.err = 0;
                exc.arg1 = exc.arg2 = x;
                exc.retval = 0.0/0.0;
                if (_LIB_VERSION == _POSIX_)
                  errno = EDOM;
                else if (!matherr(&exc)) {
                  errno = EDOM;
                }
            } else {
                /* atanh(|x|=1) */
                exc.type = SING;
                exc.name = "atanh";
                exc.err = 0;
                exc.arg1 = exc.arg2 = x;
                exc.retval = x/0.0;     /* sign(x)*inf */
                if (_LIB_VERSION == _POSIX_)
                  errno = EDOM;
                else if (!matherr(&exc)) {
                  errno = EDOM;
                }
            }
            if (exc.err != 0)
              errno = exc.err;
            return exc.retval;
        } else
            return z;
#endif
}
 
#endif /* defined(_DOUBLE_IS_32BITS) */
 
 
 
 

Line No.	Rev	Author	Line
1	207	jeremybenn
2			`/* @(#)w_atanh.c 5.1 93/09/24 */`
3			`/*`
4			`* ====================================================`
5			`* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.`
6			`*`
7			`* Developed at SunPro, a Sun Microsystems, Inc. business.`
8			`* Permission to use, copy, modify, and distribute this`
9			`* software is freely granted, provided that this notice`
10			`* is preserved.`
11			`* ====================================================`
12			`*/`
13
14			`/*`
15			`FUNCTION`
16			`<<atanh>>, <<atanhf>>---inverse hyperbolic tangent`
17
18			`INDEX`
19			`atanh`
20			`INDEX`
21			`atanhf`
22
23			`ANSI_SYNOPSIS`
24			`#include <math.h>`
25			`double atanh(double <[x]>);`
26			`float atanhf(float <[x]>);`
27
28			`TRAD_SYNOPSIS`
29			`#include <math.h>`
30			`double atanh(<[x]>)`
31			`double <[x]>;`
32
33			`float atanhf(<[x]>)`
34			`float <[x]>;`
35
36			`DESCRIPTION`
37			`<<atanh>> calculates the inverse hyperbolic tangent of <[x]>.`
38
39			`<<atanhf>> is identical, other than taking and returning`
40			`<<float>> values.`
41
42			`RETURNS`
43			`<<atanh>> and <<atanhf>> return the calculated value.`
44
45			`If`
46			`@ifnottex`
47			`\|<[x]>\|`
48			`@end ifnottex`
49			`@tex`
50			$\|x\|$
51			`@end tex`
52			`is greater than 1, the global <<errno>> is set to <<EDOM>> and`
53			`the result is a NaN. A <<DOMAIN error>> is reported.`
54
55			`If`
56			`@ifnottex`
57			`\|<[x]>\|`
58			`@end ifnottex`
59			`@tex`
60			$\|x\|$
61			`@end tex`
62			`is 1, the global <<errno>> is set to <<EDOM>>; and the result is`
63			`infinity with the same sign as <<x>>. A <<SING error>> is reported.`
64
65			`You can modify the error handling for these routines using`
66			`<<matherr>>.`
67
68			`PORTABILITY`
69			`Neither <<atanh>> nor <<atanhf>> are ANSI C.`
70
71			`QUICKREF`
72			`atanh - pure`
73			`atanhf - pure`
74
75
76			`*/`
77
78			`/*`
79			`* wrapper atanh(x)`
80			`*/`
81
82			`#include "fdlibm.h"`
83			`#include <errno.h>`
84
85			`#ifndef _DOUBLE_IS_32BITS`
86
87			`#ifdef __STDC__`
88			`double atanh(double x) /* wrapper atanh */`
89			`#else`
90			`double atanh(x) /* wrapper atanh */`
91			`double x;`
92			`#endif`
93			`{`
94			`#ifdef _IEEE_LIBM`
95			`return __ieee754_atanh(x);`
96			`#else`
97			`double z,y;`
98			`struct exception exc;`
99			`z = __ieee754_atanh(x);`
100			`if(_LIB_VERSION == _IEEE_ \|\| isnan(x)) return z;`
101			`y = fabs(x);`
102			`if(y>=1.0) {`
103			`if(y>1.0) {`
104			`/* atanh(\|x\|>1) */`
105			`exc.type = DOMAIN;`
106			`exc.name = "atanh";`
107			`exc.err = 0;`
108			`exc.arg1 = exc.arg2 = x;`
109			`exc.retval = 0.0/0.0;`
110			`if (_LIB_VERSION == _POSIX_)`
111			`errno = EDOM;`
112			`else if (!matherr(&exc)) {`
113			`errno = EDOM;`
114			`}`
115			`} else {`
116			`/* atanh(\|x\|=1) */`
117			`exc.type = SING;`
118			`exc.name = "atanh";`
119			`exc.err = 0;`
120			`exc.arg1 = exc.arg2 = x;`
121			`exc.retval = x/0.0; /* sign(x)inf /`
122			`if (_LIB_VERSION == _POSIX_)`
123			`errno = EDOM;`
124			`else if (!matherr(&exc)) {`
125			`errno = EDOM;`
126			`}`
127			`}`
128			`if (exc.err != 0)`
129			`errno = exc.err;`
130			`return exc.retval;`
131			`} else`
132			`return z;`
133			`#endif`
134			`}`
135
136			`#endif /* defined(_DOUBLE_IS_32BITS) */`
137
138
139
140

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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [math/] [w_atanh.c] - Blame information for rev 258