math/s_iseqsig_template.c

   1 /* Test whether X == Y.
   2    Copyright (C) 2016-2017 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <fenv.h>
  21 #include <math.h>
  22 #include <math_private.h>
  23 #include <stdbool.h>
  24 #include <fix-fp-int-compare-invalid.h>
  25
  26 int
  27 M_DECL_FUNC (__iseqsig) (FLOAT x, FLOAT y)
  28 {
  29   /* Comparing <= and >= is sufficient to determine both whether X and
  30      Y are equal, and whether they are unordered, while raising the
  31      "invalid" exception if they are unordered.  */
  32   bool cmp1 = x <= y;
  33   bool cmp2 = x >= y;
  34   if (cmp1 && cmp2)
  35     return 1;
  36   else if (!cmp1 && !cmp2)
  37     {
  38       if (FIX_COMPARE_INVALID)
  39         __feraiseexcept (FE_INVALID);
  40       __set_errno (EDOM);
  41     }
  42   return 0;
  43 }