diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_csin.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_csin.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_csin.c b/sysdeps/libm-ieee754/s_csin.c new file mode 100644 index 0000000000..4639bcaaa6 --- /dev/null +++ b/sysdeps/libm-ieee754/s_csin.c @@ -0,0 +1,67 @@ +/* Complex sine 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 +__csin (__complex__ double x) +{ + __complex__ double res; + + if (!isfinite (__real__ x) || isnan (__imag__ x)) + { + if (__real__ x == 0.0 || __imag__ x == 0.0) + { + __real__ res = __nan (""); + __imag__ res = 0.0; + } + else if (__isinf (__imag__ x)) + { + __real__ res = __nan (""); + __imag__ res = __imag__ x; + } + else + { + __real__ res = __nan (""); + __imag__ res = __nan (""); + } + } + else + { + __complex__ double y; + + __real__ y = -__imag__ x; + __imag__ y = __real__ x; + + y = __csinh (y); + + __real__ res = __imag__ y; + __imag__ res = -__real__ y; + } + + return res; +} +weak_alias (__csin, csin) +#ifdef NO_LONG_DOUBLE +strong_alias (__csin, __csinl) +weak_alias (__csin, csinl) +#endif |