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[glibc.git] / math / s_ccoshl.c
blobed1bc459dfb261ef92a328b0c78aaf5aa1f225aa
1 /* Complex cosine hyperbole function for long double.
2 Copyright (C) 1997, 2011 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 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.
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.
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. */
21 #include <complex.h>
22 #include <fenv.h>
23 #include <math.h>
25 #include <math_private.h>
28 __complex__ long double
29 __ccoshl (__complex__ long double x)
31 __complex__ long double retval;
32 int rcls = fpclassify (__real__ x);
33 int icls = fpclassify (__imag__ x);
35 if (__builtin_expect (rcls >= FP_ZERO, 1))
37 /* Real part is finite. */
38 if (__builtin_expect (icls >= FP_ZERO, 1))
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;
45 __sincosl (__imag__ x, &sinix, &cosix);
47 __real__ retval = cosh_val * cosix;
48 __imag__ retval = sinh_val * sinix;
50 else
52 __imag__ retval = __real__ x == 0.0 ? 0.0 : __nanl ("");
53 __real__ retval = __nanl ("") + __nanl ("");
55 if (icls == FP_INFINITE)
56 feraiseexcept (FE_INVALID);
59 else if (__builtin_expect (rcls == FP_INFINITE, 1))
61 /* Real part is infinite. */
62 if (__builtin_expect (icls > FP_ZERO, 1))
64 /* Imaginary part is finite. */
65 long double sinix, cosix;
67 __sincosl (__imag__ x, &sinix, &cosix);
69 __real__ retval = __copysignl (HUGE_VALL, cosix);
70 __imag__ retval = (__copysignl (HUGE_VALL, sinix)
71 * __copysignl (1.0, __real__ x));
73 else if (icls == FP_ZERO)
75 /* Imaginary part is 0.0. */
76 __real__ retval = HUGE_VALL;
77 __imag__ retval = __imag__ x * __copysignl (1.0, __real__ x);
79 else
81 /* The addition raises the invalid exception. */
82 __real__ retval = HUGE_VALL;
83 __imag__ retval = __nanl ("") + __nanl ("");
85 if (icls == FP_INFINITE)
86 feraiseexcept (FE_INVALID);
89 else
91 __real__ retval = __nanl ("");
92 __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nanl ("");
95 return retval;
97 weak_alias (__ccoshl, ccoshl)