math/s_cproj_template.c

   1 /* Compute projection of complex float type value to Riemann sphere.
   2    Copyright (C) 1997-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <complex.h>
  20 #include <math.h>
  21
  22
  23 CFLOAT
  24 M_DECL_FUNC (__cproj) (CFLOAT x)
  25 {
  26   if (isinf (__real__ x) || isinf (__imag__ x))
  27     {
  28       CFLOAT res;
  29
  30       __real__ res = INFINITY;
  31       __imag__ res = M_COPYSIGN (0, __imag__ x);
  32
  33       return res;
  34     }
  35
  36   return x;
  37 }
  38
  39 declare_mgen_alias (__cproj, cproj)