1 /* s_frexpf.c -- float version of s_frexp.c.
2 */
3
4 /*
5 * ====================================================
6 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
7 *
8 * Developed at SunPro, a Sun Microsystems, Inc. business.
9 * Permission to use, copy, modify, and distribute this
10 * software is freely granted, provided that this notice
11 * is preserved.
12 * ====================================================
13 */
14
15 #if defined(LIBM_SCCS) && !defined(lint)
16 static char rcsid[] = "$NetBSD: s_frexpf.c,v 1.5 1995/05/10 20:47:26 jtc Exp $";
17 #endif
18
19 #include <math.h>
20 #include <math_private.h>
21 #include <libm-alias-float.h>
22
23 static const float
24 two25 = 3.3554432000e+07; /* 0x4c000000 */
25
__frexpf(float x,int * eptr)26 float __frexpf(float x, int *eptr)
27 {
28 int32_t hx,ix;
29 GET_FLOAT_WORD(hx,x);
30 ix = 0x7fffffff&hx;
31 *eptr = 0;
32 if(ix>=0x7f800000||(ix==0)) return x + x; /* 0,inf,nan */
33 if (ix<0x00800000) { /* subnormal */
34 x *= two25;
35 GET_FLOAT_WORD(hx,x);
36 ix = hx&0x7fffffff;
37 *eptr = -25;
38 }
39 *eptr += (ix>>23)-126;
40 hx = (hx&0x807fffff)|0x3f000000;
41 SET_FLOAT_WORD(x,hx);
42 return x;
43 }
44 libm_alias_float (__frexp, frexp)
45