Blame math/s_iseqsig_template.c

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/* Test whether X == Y.
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   Copyright (C) 2016-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, see
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   <http://www.gnu.org/licenses/>.  */
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#include <errno.h>
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#include <fenv.h>
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#include <math.h>
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#include <math_private.h>
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#include <stdbool.h>
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#include <fix-fp-int-compare-invalid.h>
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int
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M_DECL_FUNC (__iseqsig) (FLOAT x, FLOAT y)
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{
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  /* Comparing <= and >= is sufficient to determine both whether X and
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     Y are equal, and whether they are unordered, while raising the
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     "invalid" exception if they are unordered.  */
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  bool cmp1 = x <= y;
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  bool cmp2 = x >= y;
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  if (cmp1 && cmp2)
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    return 1;
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  else if (!cmp1 && !cmp2)
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    {
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      if (FIX_COMPARE_INVALID)
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	__feraiseexcept (FE_INVALID);
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      __set_errno (EDOM);
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    }
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  return 0;
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}