1/* s_frexpf.c -- float version of s_frexp.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
16#ifndef lint
17static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_frexpf.c,v 1.8 2002/05/28 18:15:04 alfred Exp $";
18#endif
19
20#include "math.h"
21#include "math_private.h"
22
23static const float
24two25 =  3.3554432000e+07; /* 0x4c000000 */
25
26float
27frexpf(float x, int *eptr)
28{
29	int32_t hx,ix;
30	GET_FLOAT_WORD(hx,x);
31	ix = 0x7fffffff&hx;
32	*eptr = 0;
33	if(ix>=0x7f800000||(ix==0)) return x;	/* 0,inf,nan */
34	if (ix<0x00800000) {		/* subnormal */
35	    x *= two25;
36	    GET_FLOAT_WORD(hx,x);
37	    ix = hx&0x7fffffff;
38	    *eptr = -25;
39	}
40	*eptr += (ix>>23)-126;
41	hx = (hx&0x807fffff)|0x3f000000;
42	SET_FLOAT_WORD(x,hx);
43	return x;
44}
45