42 lines
1.6 KiB
C
42 lines
1.6 KiB
C
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/* Test for NaN that does not need libm.
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Copyright (C) 2007-2023 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#if HAVE_ISNANF_IN_LIBC
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/* Get declaration of isnan macro or (older) isnanf function. */
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# include <math.h>
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# if (__GNUC__ >= 4) || (__clang_major__ >= 4)
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/* GCC >= 4.0 and clang provide a type-generic built-in for isnan.
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GCC >= 4.0 also provides __builtin_isnanf, but clang doesn't. */
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# undef isnanf
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# define isnanf(x) __builtin_isnan ((float)(x))
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# elif defined isnan
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# undef isnanf
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# define isnanf(x) isnan ((float)(x))
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# else
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/* Get declaration of isnanf(), if not declared in <math.h>. */
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# if defined __sgi
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/* We can't include <ieeefp.h>, because it conflicts with our definition of
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isnand. Therefore declare isnanf separately. */
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extern int isnanf (float x);
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# endif
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# endif
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#else
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/* Test whether X is a NaN. */
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# undef isnanf
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# define isnanf rpl_isnanf
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extern int isnanf (float x);
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#endif
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