1*2fe8fb19SBen Gras /* s_frexpf.c -- float version of s_frexp.c.
2*2fe8fb19SBen Gras * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3*2fe8fb19SBen Gras */
4*2fe8fb19SBen Gras
5*2fe8fb19SBen Gras /*
6*2fe8fb19SBen Gras * ====================================================
7*2fe8fb19SBen Gras * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8*2fe8fb19SBen Gras *
9*2fe8fb19SBen Gras * Developed at SunPro, a Sun Microsystems, Inc. business.
10*2fe8fb19SBen Gras * Permission to use, copy, modify, and distribute this
11*2fe8fb19SBen Gras * software is freely granted, provided that this notice
12*2fe8fb19SBen Gras * is preserved.
13*2fe8fb19SBen Gras * ====================================================
14*2fe8fb19SBen Gras */
15*2fe8fb19SBen Gras
16*2fe8fb19SBen Gras #include <sys/cdefs.h>
17*2fe8fb19SBen Gras #if defined(LIBM_SCCS) && !defined(lint)
18*2fe8fb19SBen Gras __RCSID("$NetBSD: s_frexpf.c,v 1.10 2007/08/21 20:12:27 drochner Exp $");
19*2fe8fb19SBen Gras #endif
20*2fe8fb19SBen Gras
21*2fe8fb19SBen Gras #include "math.h"
22*2fe8fb19SBen Gras #include "math_private.h"
23*2fe8fb19SBen Gras
24*2fe8fb19SBen Gras static const float
25*2fe8fb19SBen Gras two25 = 3.3554432000e+07; /* 0x4c000000 */
26*2fe8fb19SBen Gras
27*2fe8fb19SBen Gras float
frexpf(float x,int * eptr)28*2fe8fb19SBen Gras frexpf(float x, int *eptr)
29*2fe8fb19SBen Gras {
30*2fe8fb19SBen Gras int32_t hx,ix;
31*2fe8fb19SBen Gras GET_FLOAT_WORD(hx,x);
32*2fe8fb19SBen Gras ix = 0x7fffffff&hx;
33*2fe8fb19SBen Gras *eptr = 0;
34*2fe8fb19SBen Gras if(ix>=0x7f800000||(ix==0)) return x; /* 0,inf,nan */
35*2fe8fb19SBen Gras if (ix<0x00800000) { /* subnormal */
36*2fe8fb19SBen Gras x *= two25;
37*2fe8fb19SBen Gras GET_FLOAT_WORD(hx,x);
38*2fe8fb19SBen Gras ix = hx&0x7fffffff;
39*2fe8fb19SBen Gras *eptr = -25;
40*2fe8fb19SBen Gras }
41*2fe8fb19SBen Gras *eptr += (ix>>23)-126;
42*2fe8fb19SBen Gras hx = (hx&0x807fffff)|0x3f000000;
43*2fe8fb19SBen Gras SET_FLOAT_WORD(x,hx);
44*2fe8fb19SBen Gras return x;
45*2fe8fb19SBen Gras }
46