1 /* Complex cosine hyperbole function for long 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.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
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 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
20
21 #include <complex.h>
22 #include <fenv.h>
23 #include <math.h>
24
25 #include "math_private.h"
26
27
28 __complex__ long double
__ccoshl(__complex__ long double x)29 __ccoshl (__complex__ long double x)
30 {
31 __complex__ long double retval;
32 int rcls = fpclassify (__real__ x);
33 int icls = fpclassify (__imag__ x);
34
35 if (rcls >= FP_ZERO)
36 {
37 /* Real part is finite. */
38 if (icls >= FP_ZERO)
39 {
40 /* Imaginary part is finite. */
41 long double sinh_val = __ieee754_sinhl (__real__ x);
42 long double cosh_val = __ieee754_coshl (__real__ x);
43 long double sinix, cosix;
44
45 __sincosl (__imag__ x, &sinix, &cosix);
46
47 __real__ retval = cosh_val * cosix;
48 __imag__ retval = sinh_val * sinix;
49 }
50 else
51 {
52 __imag__ retval = __real__ x == 0.0 ? 0.0 : __nanl ("");
53 __real__ retval = __nanl ("") + __nanl ("");
54
55 #ifdef FE_INVALID
56 if (icls == FP_INFINITE)
57 feraiseexcept (FE_INVALID);
58 #endif
59 }
60 }
61 else if (rcls == FP_INFINITE)
62 {
63 /* Real part is infinite. */
64 if (icls == FP_ZERO)
65 {
66 /* Imaginary part is 0.0. */
67 __real__ retval = HUGE_VALL;
68 __imag__ retval = __imag__ x * __copysignl (1.0, __real__ x);
69 }
70 else if (icls > FP_ZERO)
71 {
72 /* Imaginary part is finite. */
73 long double sinix, cosix;
74
75 __sincosl (__imag__ x, &sinix, &cosix);
76
77 __real__ retval = __copysignl (HUGE_VALL, cosix);
78 __imag__ retval = (__copysignl (HUGE_VALL, sinix)
79 * __copysignl (1.0, __real__ x));
80 }
81 else
82 {
83 /* The addition raises the invalid exception. */
84 __real__ retval = HUGE_VALL;
85 __imag__ retval = __nanl ("") + __nanl ("");
86
87 #ifdef FE_INVALID
88 if (icls == FP_INFINITE)
89 feraiseexcept (FE_INVALID);
90 #endif
91 }
92 }
93 else
94 {
95 __real__ retval = __nanl ("");
96 __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nanl ("");
97 }
98
99 return retval;
100 }
101 weak_alias (__ccoshl, ccoshl)
102