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#if defined(LIBM_SCCS) && !defined(lint)
17static char rcsid[] = "$NetBSD: s_frexpf.c,v 1.5 1995/05/10 20:47:26 jtc Exp $";
18#endif
19
20#include <math.h>
21#include <math_private.h>
22#include <libm-alias-float.h>
23
24static const float
25two25 = 3.3554432000e+07; /* 0x4c000000 */
26
27float __frexpf(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 + 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}
45libm_alias_float (__frexp, frexp)
46