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96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/* Copyright (C) 1991, 1992, 1995 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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <precomp.h>
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/*
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* @implemented
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*/
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int _isnan(double __x)
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{
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union
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{
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double* __x;
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double_t* x;
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} x;
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x.__x = &__x;
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return ( x.x->exponent == 0x7ff && ( x.x->mantissah != 0 || x.x->mantissal != 0 ));
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}
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int _isnanl(long double __x)
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{
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/* Intel's extended format has the normally implicit 1 explicit
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present. Sigh! */
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union
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{
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long double* __x;
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long_double_t* x;
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} x;
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x.__x = &__x;
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/* IEEE 854 NaN's have the maximum possible
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exponent and a nonzero mantissa. */
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return (( x.x->exponent == 0x7fff)
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&& ( (x.x->mantissah & 0x80000000) != 0)
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&& ( (x.x->mantissah & (unsigned int)0x7fffffff) != 0 || x.x->mantissal != 0 ));
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}
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int _isinf(double __x)
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{
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union
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{
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double* __x;
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double_t* x;
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} x;
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x.__x = &__x;
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return ( x.x->exponent == 0x7ff && ( x.x->mantissah == 0 && x.x->mantissal == 0 ));
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}
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/*
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* @implemented
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*/
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int _finite( double x )
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{
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return !_isinf(x);
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}
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int _isinfl(long double __x)
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{
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/* Intel's extended format has the normally implicit 1 explicit
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present. Sigh! */
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union
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{
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long double* __x;
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long_double_t* x;
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} x;
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x.__x = &__x;
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/* An IEEE 854 infinity has an exponent with the
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maximum possible value and a zero mantissa. */
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if ( x.x->exponent == 0x7fff && ( (x.x->mantissah == 0x80000000 ) && x.x->mantissal == 0 ))
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return x.x->sign ? -1 : 1;
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return 0;
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}
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