1/* s_frexpl.c -- long double version of s_frexp.c.
2 * Conversion to long double by Ulrich Drepper,
3 * Cygnus Support, drepper@cygnus.com.
4 */
5
6/*
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 *
10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice
13 * is preserved.
14 * ====================================================
15 */
16
17#if defined(LIBM_SCCS) && !defined(lint)
18static char rcsid[] = "$NetBSD: $";
19#endif
20
21/*
22 * for non-zero x
23 *	x = frexpl(arg,&exp);
24 * return a long double fp quantity x such that 0.5 <= |x| <1.0
25 * and the corresponding binary exponent "exp". That is
26 *	arg = x*2^exp.
27 * If arg is inf, 0.0, or NaN, then frexpl(arg,&exp) returns arg
28 * with *exp=0.
29 */
30
31#include <float.h>
32#include "math.h"
33#include "math_private.h"
34
35#ifdef __STDC__
36static const long double
37#else
38static long double
39#endif
40#if LDBL_MANT_DIG == 64
41two65 =  3.68934881474191032320e+19L; /* 0x4040, 0x80000000, 0x00000000 */
42#else
43# error "Cannot handle this MANT_DIG"
44#endif
45
46
47#ifdef __STDC__
48	long double __frexpl(long double x, int *eptr)
49#else
50	long double __frexpl(x, eptr)
51	long double x; int *eptr;
52#endif
53{
54	u_int32_t se, hx, ix, lx;
55	GET_LDOUBLE_WORDS(se,hx,lx,x);
56	ix = 0x7fff&se;
57	*eptr = 0;
58	if(ix==0x7fff||((ix|hx|lx)==0)) return x;	/* 0,inf,nan */
59	if (ix==0x0000) {		/* subnormal */
60	    x *= two65;
61	    GET_LDOUBLE_EXP(se,x);
62	    ix = se&0x7fff;
63	    *eptr = -65;
64	}
65	*eptr += ix-16382;
66	se = (se & 0x8000) | 0x3ffe;
67	SET_LDOUBLE_EXP(x,se);
68	return x;
69}
70weak_alias (__frexpl, frexpl)
71