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#include <sys/cdefs.h>
17#if defined(LIBM_SCCS) && !defined(lint)
18__RCSID("$NetBSD: s_frexpf.c,v 1.9 2002/12/05 16:03:42 scw Exp $");
19#endif
20
21#include "math.h"
22#include "math_private.h"
23
24static const float
25two25 =  3.3554432000e+07; /* 0x4c000000 */
26
27float
28frexpf(float x, int *eptr)
29{
30	int32_t hx,ix;
31	GET_FLOAT_WORD(hx,x);
32	ix = 0x7fffffff&hx;
33	*eptr = 0;
34	if(ix>=0x7f800000||(ix==0)) return x;	/* 0,inf,nan */
35	if (ix<0x00800000) {		/* subnormal */
36	    x *= two25;
37	    GET_FLOAT_WORD(hx,x);
38	    ix = hx&0x7fffffff;
39	    *eptr = -25;
40	}
41	*eptr += (ix>>23)-126;
42	hx = (hx&0x807fffff)|0x3f000000;
43	SET_FLOAT_WORD(x,hx);
44	return x;
45}
46