1/* s_frexpl.c -- long double version of s_frexp.c.
2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
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 */
15
16#if defined(LIBM_SCCS) && !defined(lint)
17static char rcsid[] = "$NetBSD: $";
18#endif
19
20/*
21 * for non-zero x
22 * x = frexpl(arg,&exp);
23 * return a long double fp quantity x such that 0.5 <= |x| <1.0
24 * and the corresponding binary exponent "exp". That is
25 * arg = x*2^exp.
26 * If arg is inf, 0.0, or NaN, then frexpl(arg,&exp) returns arg
27 * with *exp=0.
28 */
29
30#include <math.h>
31#include <math_private.h>
32#include <libm-alias-ldouble.h>
33
34static const _Float128
35two114 = L(2.0769187434139310514121985316880384E+34); /* 0x4071000000000000, 0 */
36
37_Float128 __frexpl(_Float128 x, int *eptr)
38{
39 uint64_t hx, lx, ix;
40 GET_LDOUBLE_WORDS64(hx,lx,x);
41 ix = 0x7fffffffffffffffULL&hx;
42 *eptr = 0;
43 if(ix>=0x7fff000000000000ULL||((ix|lx)==0)) return x + x;/* 0,inf,nan */
44 if (ix<0x0001000000000000ULL) { /* subnormal */
45 x *= two114;
46 GET_LDOUBLE_MSW64(hx,x);
47 ix = hx&0x7fffffffffffffffULL;
48 *eptr = -114;
49 }
50 *eptr += (ix>>48)-16382;
51 hx = (hx&0x8000ffffffffffffULL) | 0x3ffe000000000000ULL;
52 SET_LDOUBLE_MSW64(x,hx);
53 return x;
54}
55libm_alias_ldouble (__frexp, frexp)
56