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48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
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/* Return 1 if argument is a NaN, else 0.
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Copyright (C) 1997 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "math.h"
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#include <fenv_libc.h>
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int __isnan(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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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. Use explicit assembler to stop gcc complaining
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that 'isnanf' takes a float parameter, not double. */
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asm ("\
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.globl __isnanf
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.globl isnanf
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.weak isnanf
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.set __isnanf,__isnan
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.set isnanf,__isnan
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");
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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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