1  /* Test whether X == Y.
       2     Copyright (C) 2016-2023 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 <errno.h>
      20  #include <fenv.h>
      21  #include <math.h>
      22  #include <stdbool.h>
      23  #include <fix-fp-int-compare-invalid.h>
      24  
      25  int
      26  M_DECL_FUNC (__iseqsig) (FLOAT x, FLOAT y)
      27  {
      28    /* Comparing <= and >= is sufficient to determine both whether X and
      29       Y are equal, and whether they are unordered, while raising the
      30       "invalid" exception if they are unordered.  */
      31    bool cmp1 = x <= y;
      32    bool cmp2 = x >= y;
      33    if (cmp1 && cmp2)
      34      return 1;
      35    else if (!cmp1 && !cmp2)
      36      {
      37        if (FIX_COMPARE_INVALID)
      38  	__feraiseexcept (FE_INVALID);
      39        __set_errno (EDOM);
      40      }
      41    return 0;
      42  }