diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_ccosh.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_ccosh.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_ccosh.c b/sysdeps/libm-ieee754/s_ccosh.c new file mode 100644 index 0000000000..f01b245e77 --- /dev/null +++ b/sysdeps/libm-ieee754/s_ccosh.c @@ -0,0 +1,95 @@ +/* Complex cosine hyperbole function for double. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <complex.h> +#include <math.h> + + +__complex__ double +__ccosh (__complex__ double x) +{ + __complex__ double retval; + + __real__ x = fabs (__real__ x); + + if (isfinite (__real__ x)) + { + if (isfinite (__imag__ x)) + { + double exp_val = __exp (__real__ x); + double rec_exp_val = 1.0 / exp_val; + + __real__ retval = 0.5 * (exp_val + rec_exp_val) * __cos (__imag__ x); + __imag__ retval = 0.5 * (exp_val + rec_exp_val) * __sin (__imag__ x); + } + else + { + if (__real__ x == 0) + { + __imag__ retval = 0.0; + __real__ retval = __nan ("") + __nan (""); + } + else + { + __real__ retval = __nan (""); + __imag__ retval = __nan ("") + __nan (""); + } + } + } + else if (__isinf (__real__ x)) + { + if (__imag__ x == 0.0) + { + __real__ retval = HUGE_VAL; + __imag__ retval = __imag__ x; + } + else if (isfinite (__imag__ x)) + { + __real__ retval = __copysign (HUGE_VAL, __cos (__imag__ x)); + __imag__ retval = __copysign (HUGE_VAL, __sin (__imag__ x)); + } + else + { + /* The addition raises the invalid exception. */ + __real__ retval = HUGE_VAL; + __imag__ retval = __nan ("") + __nan (""); + } + } + else + { + if (__imag__ x == 0.0) + { + __real__ retval = __nan (""); + __imag__ retval = __imag__ x; + } + else + { + __real__ retval = __nan (""); + __imag__ retval = __nan (""); + } + } + + return retval; +} +weak_alias (__ccosh, ccosh) +#ifdef NO_LONG_DOUBLE +strong_alias (__ccosh, __ccoshl) +weak_alias (__ccosh, ccoshl) +#endif |