s_frexp.c (2dcc228679cb39677331f1064bedb9eac825a52f) s_frexp.c (59b19ff14a36bb975819fff8c7bd8648a9b29537)
1/* @(#)s_frexp.c 5.1 93/09/24 */
2/*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 *
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice

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25 */
26
27#include "math.h"
28#include "math_private.h"
29
30static const double
31two54 = 1.80143985094819840000e+16; /* 0x43500000, 0x00000000 */
32
1/* @(#)s_frexp.c 5.1 93/09/24 */
2/*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 *
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice

--- 16 unchanged lines hidden (view full) ---

25 */
26
27#include "math.h"
28#include "math_private.h"
29
30static const double
31two54 = 1.80143985094819840000e+16; /* 0x43500000, 0x00000000 */
32
33 double frexp(double x, int *eptr)
33double
34frexp(double x, int *eptr)
34{
35 int32_t hx, ix, lx;
36 EXTRACT_WORDS(hx,lx,x);
37 ix = 0x7fffffff&hx;
38 *eptr = 0;
39 if(ix>=0x7ff00000||((ix|lx)==0)) return x; /* 0,inf,nan */
40 if (ix<0x00100000) { /* subnormal */
41 x *= two54;
42 GET_HIGH_WORD(hx,x);
43 ix = hx&0x7fffffff;
44 *eptr = -54;
45 }
46 *eptr += (ix>>20)-1022;
47 hx = (hx&0x800fffff)|0x3fe00000;
48 SET_HIGH_WORD(x,hx);
49 return x;
50}
35{
36 int32_t hx, ix, lx;
37 EXTRACT_WORDS(hx,lx,x);
38 ix = 0x7fffffff&hx;
39 *eptr = 0;
40 if(ix>=0x7ff00000||((ix|lx)==0)) return x; /* 0,inf,nan */
41 if (ix<0x00100000) { /* subnormal */
42 x *= two54;
43 GET_HIGH_WORD(hx,x);
44 ix = hx&0x7fffffff;
45 *eptr = -54;
46 }
47 *eptr += (ix>>20)-1022;
48 hx = (hx&0x800fffff)|0x3fe00000;
49 SET_HIGH_WORD(x,hx);
50 return x;
51}