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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [cmath/] [s_casinh.c] - Rev 262
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/* Return arc hyperbole sine for double 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 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <complex.h> #include <math.h> #include "math_private.h" __complex__ double __casinh (__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 = __copysign (HUGE_VAL, __real__ x); if (rcls == FP_NAN) __imag__ res = __nan (""); else __imag__ res = __copysign (rcls >= FP_ZERO ? M_PI_2 : M_PI_4, __imag__ x); } else if (rcls <= FP_INFINITE) { __real__ res = __real__ x; if ((rcls == FP_INFINITE && icls >= FP_ZERO) || (rcls == FP_NAN && icls == FP_ZERO)) __imag__ res = __copysign (0.0, __imag__ x); else __imag__ res = __nan (""); } else { __real__ res = __nan (""); __imag__ res = __nan (""); } } else if (rcls == FP_ZERO && icls == FP_ZERO) { res = x; } else { __complex__ double y; __real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) + 1.0; __imag__ y = 2.0 * __real__ x * __imag__ x; y = __csqrt (y); __real__ y += __real__ x; __imag__ y += __imag__ x; res = __clog (y); } return res; } weak_alias (__casinh, casinh) #ifdef NO_LONG_DOUBLE strong_alias (__casinh, __casinhl) weak_alias (__casinh, casinhl) #endif
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