mirror of git://gcc.gnu.org/git/gcc.git
74 lines
1.3 KiB
C
74 lines
1.3 KiB
C
|
|
/* @(#)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 */
|