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60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* Return 1 if argument is a NaN, else 0.
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Copyright (C) 2007-2020 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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<https://www.gnu.org/licenses/>. */
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/* Ugly kludge to avoid declarations. */
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#define __isnanf not___isnanf
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#define isnanf not_isnanf
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#define __GI___isnanf not__GI___isnanf
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#include <math.h>
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#include <math_private.h>
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#include <math_ldbl_opt.h>
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#undef __isnanf
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#undef isnanf
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#undef __GI___isnanf
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int
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__isnan (double x)
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{
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uint64_t ix;
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EXTRACT_WORDS64 (ix, x);
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return ix * 2 > 0xffe0000000000000ul;
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}
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hidden_def (__isnan)
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weak_alias (__isnan, isnan)
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/* It turns out that the 'double' version will also always work for
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single-precision. */
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strong_alias (__isnan, __isnanf)
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weak_alias (__isnan, isnanf)
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/* ??? GCC 4.8 fails to look through chains of aliases with asm names
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attached. Work around this for now. */
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hidden_ver (__isnan, __isnanf)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__isnan, __isnanl)
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weak_alias (__isnan, isnanl)
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#endif
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#if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
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compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
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compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
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#endif
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