| 1 | /* Wrapper to set errno for ilogb. |
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| 2 | Copyright (C) 2012-2022 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 <math.h> |
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| 20 | #include <errno.h> |
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| 21 | #include <limits.h> |
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| 22 | #include <math_private.h> |
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| 23 | #include <fenv.h> |
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| 24 | |
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| 25 | /* wrapper ilogb */ |
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| 26 | int |
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| 27 | M_DECL_FUNC (__ilogb) (FLOAT x) |
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| 28 | { |
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| 29 | int r = M_SUF (__ieee754_ilogb) (x); |
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| 30 | if (__builtin_expect (r == FP_ILOGB0, 0) |
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| 31 | || __builtin_expect (r == FP_ILOGBNAN, 0) |
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| 32 | || __builtin_expect (r == INT_MAX, 0)) |
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| 33 | { |
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| 34 | __set_errno (EDOM); |
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| 35 | __feraiseexcept (FE_INVALID); |
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| 36 | } |
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| 37 | return r; |
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| 38 | } |
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| 39 | declare_mgen_alias (__ilogb, ilogb) |
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| 40 | |
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