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glibc/math/s_cacosh.c
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/* Return arc hyperbole cosine for double value. | |
Copyright (C) 1997-2016 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 Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <complex.h> | |
#include <math.h> | |
#include <math_private.h> | |
__complex__ double | |
__cacosh (__complex__ double x) | |
{ | |
__complex__ double 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_VAL; | |
if (rcls == FP_NAN) | |
__imag__ res = __nan (""); | |
else | |
__imag__ res = __copysign ((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_VAL; | |
if (icls >= FP_ZERO) | |
__imag__ res = __copysign (signbit (__real__ x) ? M_PI : 0.0, | |
__imag__ x); | |
else | |
__imag__ res = __nan (""); | |
} | |
else | |
{ | |
__real__ res = __nan (""); | |
__imag__ res = __nan (""); | |
} | |
} | |
else if (rcls == FP_ZERO && icls == FP_ZERO) | |
{ | |
__real__ res = 0.0; | |
__imag__ res = __copysign (M_PI_2, __imag__ x); | |
} | |
else | |
{ | |
__complex__ double y; | |
__real__ y = -__imag__ x; | |
__imag__ y = __real__ x; | |
y = __kernel_casinh (y, 1); | |
if (signbit (__imag__ x)) | |
{ | |
__real__ res = __real__ y; | |
__imag__ res = -__imag__ y; | |
} | |
else | |
{ | |
__real__ res = -__real__ y; | |
__imag__ res = __imag__ y; | |
} | |
} | |
return res; | |
} | |
weak_alias (__cacosh, cacosh) | |
#ifdef NO_LONG_DOUBLE | |
strong_alias (__cacosh, __cacoshl) | |
weak_alias (__cacosh, cacoshl) | |
#endif |