Update.
[glibc.git] / sysdeps / libm-ieee754 / s_csinhf.c
blob9c479bba95cdebf97db0aa5310a31b31fef9fae3
1 /* Complex sine 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 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. */
21 #include <complex.h>
22 #include <fenv.h>
23 #include <math.h>
25 #include "math_private.h"
28 __complex__ float
29 __csinhf (__complex__ float x)
31 __complex__ float retval;
32 int negate = signbit (__real__ x);
33 int rcls = fpclassify (__real__ x);
34 int icls = fpclassify (__imag__ x);
36 __real__ x = fabsf (__real__ x);
38 if (rcls >= FP_ZERO)
40 /* Real part is finite. */
41 if (icls >= FP_ZERO)
43 /* Imaginary part is finite. */
44 float sinh_val = __ieee754_sinhf (__real__ x);
45 float cosh_val = __ieee754_coshf (__real__ x);
46 float sinix, cosix;
48 __sincosf (__imag__ x, &sinix, &cosix);
50 __real__ retval = sinh_val * cosix;
51 __imag__ retval = cosh_val * sinix;
53 if (negate)
54 __real__ retval = -__real__ retval;
56 else
58 if (rcls == FP_ZERO)
60 /* Real part is 0.0. */
61 __real__ retval = __copysignf (0.0, negate ? -1.0 : 1.0);
62 __imag__ retval = __nanf ("") + __nanf ("");
64 #ifdef FE_INVALID
65 if (icls == FP_INFINITE)
66 feraiseexcept (FE_INVALID);
67 #endif
69 else
71 __real__ retval = __nanf ("");
72 __imag__ retval = __nanf ("");
74 #ifdef FE_INVALID
75 feraiseexcept (FE_INVALID);
76 #endif
80 else if (rcls == FP_INFINITE)
82 /* Real part is infinite. */
83 if (icls == FP_ZERO)
85 /* Imaginary part is 0.0. */
86 __real__ retval = negate ? -HUGE_VALF : HUGE_VALF;
87 __imag__ retval = __imag__ x;
89 else if (icls > FP_ZERO)
91 /* Imaginary part is finite. */
92 float sinix, cosix;
94 __sincosf (__imag__ x, &sinix, &cosix);
96 __real__ retval = __copysignf (HUGE_VALF, cosix);
97 __imag__ retval = __copysignf (HUGE_VALF, sinix);
99 if (negate)
100 __real__ retval = -__real__ retval;
102 else
104 /* The addition raises the invalid exception. */
105 __real__ retval = HUGE_VALF;
106 __imag__ retval = __nanf ("") + __nanf ("");
108 #ifdef FE_INVALID
109 if (icls == FP_INFINITE)
110 feraiseexcept (FE_INVALID);
111 #endif
114 else
116 __real__ retval = __nanf ("");
117 __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nanf ("");
120 return retval;
122 weak_alias (__csinhf, csinhf)