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[/] [openrisc/] [tags/] [gnu-dev/] [fsf-gcc-snapshot-1-mar-12/] [or1k-gcc/] [libquadmath/] [math/] [catanhq.c] - Rev 740
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/* Return arc hyperbole tangent for __float128 value. Copyright (C) 1997, 1998 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 "quadmath-imp.h" __complex128 catanhq (__complex128 x) { __complex128 res; int rcls = fpclassifyq (__real__ x); int icls = fpclassifyq (__imag__ x); if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE) { if (icls == QUADFP_INFINITE) { __real__ res = copysignq (0.0, __real__ x); __imag__ res = copysignq (M_PI_2q, __imag__ x); } else if (rcls == QUADFP_INFINITE || rcls == QUADFP_ZERO) { __real__ res = copysignq (0.0, __real__ x); if (icls >= QUADFP_ZERO) __imag__ res = copysignq (M_PI_2q, __imag__ x); else __imag__ res = nanq (""); } else { __real__ res = nanq (""); __imag__ res = nanq (""); } } else if (rcls == QUADFP_ZERO && icls == QUADFP_ZERO) { res = x; } else { __float128 i2, num, den; i2 = __imag__ x * __imag__ x; num = 1.0 + __real__ x; num = i2 + num * num; den = 1.0 - __real__ x; den = i2 + den * den; __real__ res = 0.25 * (logq (num) - logq (den)); den = 1 - __real__ x * __real__ x - i2; __imag__ res = 0.5 * atan2q (2.0 * __imag__ x, den); } return res; }
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