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- /* Return arc sine of a complex float type.
- Copyright (C) 1997-2018 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 "quadmath-imp.h"
- __complex128
- casinq (__complex128 x)
- {
- __complex128 res;
- if (isnanq (__real__ x) || isnanq (__imag__ x))
- {
- if (__real__ x == 0)
- {
- res = x;
- }
- else if (isinfq (__real__ x) || isinfq (__imag__ x))
- {
- __real__ res = nanq ("");
- __imag__ res = copysignq (HUGE_VALQ, __imag__ x);
- }
- else
- {
- __real__ res = nanq ("");
- __imag__ res = nanq ("");
- }
- }
- else
- {
- __complex128 y;
- __real__ y = -__imag__ x;
- __imag__ y = __real__ x;
- y = casinhq (y);
- __real__ res = __imag__ y;
- __imag__ res = -__real__ y;
- }
- return res;
- }
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