]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/libm-ieee754/s_ccosh.c
1 /* Complex cosine hyperbole function for double.
2 Copyright (C) 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
25 #include "math_private.h"
29 __ccosh (__complex__
double x
)
31 __complex__
double retval
;
32 int rcls
= fpclassify (__real__ x
);
33 int icls
= fpclassify (__imag__ x
);
35 __real__ x
= fabs (__real__ x
);
39 /* Real part is finite. */
42 /* Imaginary part is finite. */
43 double sinh_val
= __ieee754_sinh (__real__ x
);
44 double cosh_val
= __ieee754_cosh (__real__ x
);
47 __sincos (__imag__ x
, &sinix
, &cosix
);
49 __real__ retval
= cosh_val
* cosix
;
50 __imag__ retval
= sinh_val
* sinix
;
54 __imag__ retval
= __real__ x
== 0.0 ? 0.0 : __nan ("");
55 __real__ retval
= __nan ("") + __nan ("");
58 if (icls
== FP_INFINITE
)
59 feraiseexcept (FE_INVALID
);
63 else if (rcls
== FP_INFINITE
)
65 /* Real part is infinite. */
68 /* Imaginary part is 0.0. */
69 __real__ retval
= HUGE_VAL
;
70 __imag__ retval
= __imag__ x
;
72 else if (icls
> FP_ZERO
)
74 /* Imaginary part is finite. */
77 __sincos (__imag__ x
, &sinix
, &cosix
);
79 __real__ retval
= __copysign (HUGE_VAL
, cosix
);
80 __imag__ retval
= __copysign (HUGE_VAL
, sinix
);
84 /* The addition raises the invalid exception. */
85 __real__ retval
= HUGE_VAL
;
86 __imag__ retval
= __nan ("") + __nan ("");
89 if (icls
== FP_INFINITE
)
90 feraiseexcept (FE_INVALID
);
96 __real__ retval
= __nan ("");
97 __imag__ retval
= __imag__ x
== 0.0 ? __imag__ x
: __nan ("");
102 weak_alias (__ccosh
, ccosh
)
103 #ifdef NO_LONG_DOUBLE
104 strong_alias (__ccosh
, __ccoshl
)
105 weak_alias (__ccosh
, ccoshl
)