| 1 | /* Return 1 if argument is a NaN, else 0. |
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| 2 | Copyright (C) 2007-2022 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 | /* Ugly kludge to avoid declarations. */ |
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| 20 | #define __isnanf not___isnanf |
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| 21 | #define isnanf not_isnanf |
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| 22 | #define __GI___isnanf not__GI___isnanf |
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| 23 | |
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| 24 | #include <math.h> |
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| 25 | #include <math_private.h> |
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| 26 | #include <math_ldbl_opt.h> |
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| 27 | |
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| 28 | #undef __isnanf |
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| 29 | #undef isnanf |
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| 30 | #undef __GI___isnanf |
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| 31 | |
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| 32 | int |
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| 33 | __isnan (double x) |
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| 34 | { |
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| 35 | uint64_t ix; |
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| 36 | EXTRACT_WORDS64 (ix, x); |
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| 37 | return ix * 2 > 0xffe0000000000000ul; |
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| 38 | } |
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| 39 | |
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| 40 | hidden_def (__isnan) |
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| 41 | weak_alias (__isnan, isnan) |
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| 42 | |
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| 43 | /* It turns out that the 'double' version will also always work for |
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| 44 | single-precision. */ |
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| 45 | strong_alias (__isnan, __isnanf) |
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| 46 | weak_alias (__isnan, isnanf) |
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| 47 | |
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| 48 | /* ??? GCC 4.8 fails to look through chains of aliases with asm names |
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| 49 | attached. Work around this for now. */ |
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| 50 | hidden_ver (__isnan, __isnanf) |
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| 51 | |
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| 52 | #ifdef NO_LONG_DOUBLE |
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| 53 | strong_alias (__isnan, __isnanl) |
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| 54 | weak_alias (__isnan, isnanl) |
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| 55 | #endif |
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| 56 | #if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0) |
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| 57 | compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0); |
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| 58 | compat_symbol (libc, isnan, isnanl, GLIBC_2_0); |
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| 59 | #endif |
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| 60 | |
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