1/* s_frexpl.c -- long double version of s_frexp.c.
2 */
3
4/*
5 * ====================================================
6 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
7 *
8 * Developed at SunPro, a Sun Microsystems, Inc. business.
9 * Permission to use, copy, modify, and distribute this
10 * software is freely granted, provided that this notice
11 * is preserved.
12 * ====================================================
13 */
14
15#if defined(LIBM_SCCS) && !defined(lint)
16static char rcsid[] = "$NetBSD: $";
17#endif
18
19/*
20 * for non-zero x
21 * x = frexpl(arg,&exp);
22 * return a long double fp quantity x such that 0.5 <= |x| <1.0
23 * and the corresponding binary exponent "exp". That is
24 * arg = x*2^exp.
25 * If arg is inf, 0.0, or NaN, then frexpl(arg,&exp) returns arg
26 * with *exp=0.
27 */
28
29#include <math.h>
30#include <math_private.h>
31#include <libm-alias-ldouble.h>
32
33static const _Float128
34two114 = L(2.0769187434139310514121985316880384E+34); /* 0x4071000000000000, 0 */
35
36_Float128 __frexpl(_Float128 x, int *eptr)
37{
38 uint64_t hx, lx, ix;
39 GET_LDOUBLE_WORDS64(hx,lx,x);
40 ix = 0x7fffffffffffffffULL&hx;
41 *eptr = 0;
42 if(ix>=0x7fff000000000000ULL||((ix|lx)==0)) return x + x;/* 0,inf,nan */
43 if (ix<0x0001000000000000ULL) { /* subnormal */
44 x *= two114;
45 GET_LDOUBLE_MSW64(hx,x);
46 ix = hx&0x7fffffffffffffffULL;
47 *eptr = -114;
48 }
49 *eptr += (ix>>48)-16382;
50 hx = (hx&0x8000ffffffffffffULL) | 0x3ffe000000000000ULL;
51 SET_LDOUBLE_MSW64(x,hx);
52 return x;
53}
54libm_alias_ldouble (__frexp, frexp)
55

source code of glibc/sysdeps/ieee754/ldbl-128/s_frexpl.c