ipiq: Add simple IPI latency measure sysctls (2)
[dragonfly.git] / lib / libm / src / s_frexpf.c
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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 *
6ff43c94 15 * $FreeBSD: head/lib/msun/src/s_frexpf.c 176451 2008-02-22 02:30:36Z das $
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16 */
17
6ff43c94 18#include "math.h"
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19#include "math_private.h"
20
21static const float
22two25 = 3.3554432000e+07; /* 0x4c000000 */
23
24float
25frexpf(float x, int *eptr)
26{
27 int32_t hx,ix;
28 GET_FLOAT_WORD(hx,x);
29 ix = 0x7fffffff&hx;
30 *eptr = 0;
31 if(ix>=0x7f800000||(ix==0)) return x; /* 0,inf,nan */
32 if (ix<0x00800000) { /* subnormal */
33 x *= two25;
34 GET_FLOAT_WORD(hx,x);
35 ix = hx&0x7fffffff;
36 *eptr = -25;
37 }
38 *eptr += (ix>>23)-126;
39 hx = (hx&0x807fffff)|0x3f000000;
74dfd0cf 40 SET_FLOAT_WORD(x,hx);
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41 return x;
42}