1/* frexpq.c -- __float128 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/*
17 * for non-zero x
18 * x = frexpq(arg,&exp);
19 * return a __float128 fp quantity x such that 0.5 <= |x| <1.0
20 * and the corresponding binary exponent "exp". That is
21 * arg = x*2^exp.
22 * If arg is inf, 0.0, or NaN, then frexpq(arg,&exp) returns arg
23 * with *exp=0.
24 */
25
26#include "quadmath-imp.h"
27
28static const __float128
29two114 = 2.0769187434139310514121985316880384E+34Q; /* 0x4071000000000000, 0 */
30
31__float128
32frexpq (__float128 x, int *eptr)
33{
34 uint64_t hx, lx, ix;
35 GET_FLT128_WORDS64(hx,lx,x);
36 ix = 0x7fffffffffffffffULL&hx;
37 *eptr = 0;
38 if(ix>=0x7fff000000000000ULL||((ix|lx)==0)) return x + x;/* 0,inf,nan */
39 if (ix<0x0001000000000000ULL) { /* subnormal */
40 x *= two114;
41 GET_FLT128_MSW64(hx,x);
42 ix = hx&0x7fffffffffffffffULL;
43 *eptr = -114;
44 }
45 *eptr += (ix>>48)-16382;
46 hx = (hx&0x8000ffffffffffffULL) | 0x3ffe000000000000ULL;
47 SET_FLT128_MSW64(x,hx);
48 return x;
49}
50