s_fabs.c

来自「linux下建立JAVA虚拟机的源码KAFFE」· C语言 代码 · 共 37 行

/* @(#)s_fabs.c 1.3 95/01/18 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunSoft, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice 
 * is preserved.
 * ====================================================
 */

/*
 * 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 hx;

	GET_HIGH_WORD(hx,x);
	SET_HIGH_WORD(x, hx & 0x7fffffff);
        return x;
}

#endif /* _DOUBLE_IS_32BITS */