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[glibc/history.git] / math / s_ccoshf.c
blobf400d34f0be8882f1fa65c21cee2ff5cf7b8146f
1 /* Complex cosine hyperbole function for float.
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 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__ float
29 __ccoshf (__complex__ float x)
31 __complex__ float retval;
32 int rcls = fpclassify (__real__ x);
33 int icls = fpclassify (__imag__ x);
35 if (rcls >= FP_ZERO)
37 /* Real part is finite. */
38 if (icls >= FP_ZERO)
40 /* Imaginary part is finite. */
41 float sinh_val = __ieee754_sinhf (__real__ x);
42 float cosh_val = __ieee754_coshf (__real__ x);
43 float sinix, cosix;
45 __sincosf (__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 : __nanf ("");
53 __real__ retval = __nanf ("");
55 #ifdef FE_INVALID
56 if (icls == FP_INFINITE)
57 feraiseexcept (FE_INVALID);
58 #endif
61 else if (rcls == FP_INFINITE)
63 /* Real part is infinite. */
64 if (icls == FP_ZERO)
66 /* Imaginary part is 0.0. */
67 __real__ retval = HUGE_VALF;
68 __imag__ retval = __imag__ x * __copysignf (1.0, __real__ x);
70 else if (icls > FP_ZERO)
72 /* Imaginary part is finite. */
73 float sinix, cosix;
75 __sincosf (__imag__ x, &sinix, &cosix);
77 __real__ retval = __copysignf (HUGE_VALF, cosix);
78 __imag__ retval = (__copysignf (HUGE_VALF, sinix)
79 * __copysignf (1.0, __real__ x));
81 else
83 /* The addition raises the invalid exception. */
84 __real__ retval = HUGE_VALF;
85 __imag__ retval = __nanf ("") + __nanf ("");
87 #ifdef FE_INVALID
88 if (icls == FP_INFINITE)
89 feraiseexcept (FE_INVALID);
90 #endif
93 else
95 __real__ retval = __nanf ("");
96 __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nanf ("");
99 return retval;
101 #ifndef __ccoshf
102 weak_alias (__ccoshf, ccoshf)
103 #endif