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: head/lib/msun/src/s_frexpf.c 170550 2007-06-11 07:48:52Z bde $";
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}