s_frexpf.c

来自「基于组件方式开发操作系统的OSKIT源代码」· C语言 代码 · 共 53 行

/* s_frexpf.c -- float version of s_frexp.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, [e-mail].
 */

/*
 * ====================================================
 * 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.
 * ====================================================
 */

#ifndef lint
static char rcsid[] = "$Id: s_frexpf.c,v 1.5 1997/02/22 15:11:19 peter Exp $";
#endif

#include "math.h"
#include "math_private.h"

#ifdef __STDC__
static const float
#else
static float
#endif
two25 =  3.3554432000e+07; /* 0x4c000000 */

#ifdef __STDC__
	float frexpf(float x, int *eptr)
#else
	float frexpf(x, eptr)
	float x; int *eptr;
#endif
{
	int32_t hx,ix;
	GET_FLOAT_WORD(hx,x);
	ix = 0x7fffffff&hx;
	*eptr = 0;
	if(ix>=0x7f800000||(ix==0)) return x;	/* 0,inf,nan */
	if (ix<0x00800000) {		/* subnormal */
	    x *= two25;
	    GET_FLOAT_WORD(hx,x);
	    ix = hx&0x7fffffff;
	    *eptr = -25;
	}
	*eptr += (ix>>23)-126;
	hx = (hx&0x807fffff)|0x3f000000;
	*(int*)&x = hx;
	return x;
}