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 = frexpq(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 frexpq(arg,&exp) returns arg
27 * with *exp=0.
28 */
29
30#include "quadmath-imp.h"
31
32static const __float128
33two114 = 2.0769187434139310514121985316880384E+34Q; /* 0x4071000000000000, 0 */
34
35__float128 frexpq(__float128 x, int *eptr)
36{
37	uint64_t hx, lx, ix;
38	GET_FLT128_WORDS64(hx,lx,x);
39	ix = 0x7fffffffffffffffULL&hx;
40	*eptr = 0;
41	if(ix>=0x7fff000000000000ULL||((ix|lx)==0)) return x + x;/* 0,inf,nan */
42	if (ix<0x0001000000000000ULL) {		/* subnormal */
43	    x *= two114;
44	    GET_FLT128_MSW64(hx,x);
45	    ix = hx&0x7fffffffffffffffULL;
46	    *eptr = -114;
47	}
48	*eptr += (ix>>48)-16382;
49	hx = (hx&0x8000ffffffffffffULL) | 0x3ffe000000000000ULL;
50	SET_FLT128_MSW64(x,hx);
51	return x;
52}
53