1/* Test whether X == Y.
2 Copyright (C) 2016-2020 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
25int
26M_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}
43