Subversion Repositories openrisc_2011-10-31

 
/* @(#)s_fabs.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice 
 * is preserved.
 * ====================================================
 */
 
/*
FUNCTION
       <<fabs>>, <<fabsf>>---absolute value (magnitude)
INDEX
	fabs
INDEX
	fabsf
 
ANSI_SYNOPSIS
	#include <math.h>
       double fabs(double <[x]>);
       float fabsf(float <[x]>);
 
TRAD_SYNOPSIS
	#include <math.h>
       double fabs(<[x]>) 
       double <[x]>;
 
       float fabsf(<[x]>)
       float <[x]>;
 
DESCRIPTION
<<fabs>> and <<fabsf>> calculate 
@tex
$|x|$, 
@end tex
the absolute value (magnitude) of the argument <[x]>, by direct
manipulation of the bit representation of <[x]>.
 
RETURNS
The calculated value is returned.  No errors are detected.
 
PORTABILITY
<<fabs>> is ANSI.
<<fabsf>> is an extension.
 
*/
 
/*
 * fabs(x) returns the absolute value of x.
 */
 
#include "fdlibm.h"
 
#ifndef _DOUBLE_IS_32BITS
 
#ifdef __STDC__
	double fabs(double x)
#else
	double fabs(x)
	double x;
#endif
{
	__uint32_t high;
	GET_HIGH_WORD(high,x);
	SET_HIGH_WORD(x,high&0x7fffffff);
        return x;
}
 
#endif /* _DOUBLE_IS_32BITS */