| 1 | /* Test whether X == Y. |
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| 2 | Copyright (C) 2016-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <errno.h> |
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| 20 | #include <fenv.h> |
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| 21 | #include <math.h> |
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| 22 | #include <stdbool.h> |
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| 23 | #include <fix-fp-int-compare-invalid.h> |
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| 24 | |
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| 25 | int |
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| 26 | M_DECL_FUNC (__iseqsig) (FLOAT x, FLOAT y) |
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| 27 | { |
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| 28 | /* Comparing <= and >= is sufficient to determine both whether X and |
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| 29 | Y are equal, and whether they are unordered, while raising the |
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| 30 | "invalid" exception if they are unordered. */ |
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| 31 | bool cmp1 = x <= y; |
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| 32 | bool cmp2 = x >= y; |
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| 33 | if (cmp1 && cmp2) |
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| 34 | return 1; |
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| 35 | else if (!cmp1 && !cmp2) |
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| 36 | { |
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| 37 | if (FIX_COMPARE_INVALID) |
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| 38 | __feraiseexcept (FE_INVALID); |
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| 39 | __set_errno (EDOM); |
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| 40 | } |
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| 41 | return 0; |
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| 42 | } |
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| 43 | |
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