libquadmath/math/casinhq.c

   1 /* Return arc hyperbolic sine for a complex float type.
   2    Copyright (C) 1997-2018 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include "quadmath-imp.h"
  21
  22 __complex128
  23 casinhq (__complex128 x)
  24 {
  25   __complex128 res;
  26   int rcls = fpclassifyq (__real__ x);
  27   int icls = fpclassifyq (__imag__ x);
  28
  29   if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE)
  30     {
  31       if (icls == QUADFP_INFINITE)
  32         {
  33           __real__ res = copysignq (HUGE_VALQ, __real__ x);
  34
  35           if (rcls == QUADFP_NAN)
  36             __imag__ res = nanq ("");
  37           else
  38             __imag__ res = copysignq ((rcls >= QUADFP_ZERO
  39                                         ? M_PI_2q : M_PI_4q),
  40                                        __imag__ x);
  41         }
  42       else if (rcls <= QUADFP_INFINITE)
  43         {
  44           __real__ res = __real__ x;
  45           if ((rcls == QUADFP_INFINITE && icls >= QUADFP_ZERO)
  46               || (rcls == QUADFP_NAN && icls == QUADFP_ZERO))
  47             __imag__ res = copysignq (0, __imag__ x);
  48           else
  49             __imag__ res = nanq ("");
  50         }
  51       else
  52         {
  53           __real__ res = nanq ("");
  54           __imag__ res = nanq ("");
  55         }
  56     }
  57   else if (rcls == QUADFP_ZERO && icls == QUADFP_ZERO)
  58     {
  59       res = x;
  60     }
  61   else
  62     {
  63       res = __quadmath_kernel_casinhq (x, 0);
  64     }
  65
  66   return res;
  67 }