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 */