diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_cacoshf.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_cacoshf.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_cacoshf.c b/sysdeps/libm-ieee754/s_cacoshf.c new file mode 100644 index 0000000000..bcfebea123 --- /dev/null +++ b/sysdeps/libm-ieee754/s_cacoshf.c @@ -0,0 +1,84 @@ +/* Return arc hyperbole cosine for float value. + 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__ float +__cacoshf (__complex__ float x) +{ + __complex__ float res; + int rcls = fpclassify (__real__ x); + int icls = fpclassify (__imag__ x); + + if (rcls <= FP_INFINITE || icls <= FP_INFINITE) + { + if (icls == FP_INFINITE) + { + __real__ res = HUGE_VALF; + + if (rcls == FP_NAN) + __imag__ res = __nanf (""); + else + __imag__ res = __copysignf ((rcls == FP_INFINITE + ? (__real__ x < 0.0 + ? M_PI - M_PI_4 : M_PI_4) + : M_PI_2), __imag__ x); + } + else if (rcls == FP_INFINITE) + { + __real__ res = HUGE_VALF; + + if (icls >= FP_ZERO) + __imag__ res = __copysignf (signbit (__real__ x) ? M_PI : 0.0, + __imag__ x); + else + __imag__ res = __nanf (""); + } + else + { + __real__ res = __nanf (""); + __imag__ res = __nanf (""); + } + } + else if (rcls == FP_ZERO && icls == FP_ZERO) + { + __real__ res = 0.0; + __imag__ res = __copysignf (M_PI_2, __imag__ x); + } + else + { + __complex__ float y; + + __real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) - 1.0; + __imag__ y = 2.0 * __real__ x * __imag__ x; + + y = __csqrtf (y); + + __real__ y += __real__ x; + __imag__ y += __imag__ x; + + res = __clogf (y); + } + + return res; +} +weak_alias (__cacoshf, cacoshf) |