Subversion Repositories openrisc_2011-10-31

/* Copyright (C) 2002 by  Red Hat, Incorporated. All rights reserved.

 *

 * Permission to use, copy, modify, and distribute this software

 * is freely granted, provided that this notice is preserved.

 */

/*

FUNCTION

<<signbit>>--Does floating-point number have negative sign?

INDEX

        signbit

ANSI_SYNOPSIS

        #include <math.h>

        int signbit(real-floating <[x]>);

DESCRIPTION

The <<signbit>> macro determines whether the sign of its argument value is

negative.  The macro reports the sign of all values, including infinities,

zeros, and NaNs.  If zero is unsigned, it is treated as positive.  As shown in

the synopsis, the argument is "real-floating," meaning that any of the real

floating-point types (float, double, etc.) may be given to it.

Note that because of the possibilities of signed 0 and NaNs, the expression

"<[x]> < 0.0" does not give the same result as <<signbit>> in all cases.

RETURNS

The <<signbit>> macro returns a nonzero value if and only if the sign of its

argument value is negative.

PORTABILITY

C99, POSIX.

*/

#include "fdlibm.h"

int __signbitf (float x);

int __signbitd (double x);

int

__signbitf (float x)

{

  unsigned int w;

  GET_FLOAT_WORD(w,x);

  return (w & 0x80000000);

}

int

__signbitd (double x)

{

  unsigned int msw;

  GET_HIGH_WORD(msw, x);

  return (msw & 0x80000000);

}