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64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/* Return 1 if argument is a NaN, else 0.
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Copyright (C) 1997, 2000, 2002, 2006 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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<http://www.gnu.org/licenses/>. */
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/* Ugly kludge to avoid declarations. */
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#define __isnanf __Xisnanf
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#define isnanf Xisnanf
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#define __GI___isnanf __GI___Xisnanf
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#include <math.h>
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#include <math_ldbl_opt.h>
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#include <fenv_libc.h>
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#undef __isnanf
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#undef isnanf
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#undef __GI___isnanf
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/* The hidden_proto in include/math.h was obscured by the macro hackery. */
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__typeof (__isnan) __isnanf;
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hidden_proto (__isnanf)
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int
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__isnan (x)
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double x;
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{
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fenv_t savedstate;
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int result;
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savedstate = fegetenv_register ();
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reset_fpscr_bit (FPSCR_VE);
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result = !(x == x);
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fesetenv_register (savedstate);
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return result;
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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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hidden_def (__isnanf)
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weak_alias (__isnanf, 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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