2 * From: @(#)s_ilogb.c 5.1 93/09/24
3 * $FreeBSD: head/lib/msun/src/s_ilogbl.c 176451 2008-02-22 02:30:36Z das $
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
7 * Developed at SunPro, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
11 * ====================================================
28 if (u.bits.exp == 0) {
29 if ((u.bits.manl | u.bits.manh) == 0)
32 if (u.bits.manh == 0) {
33 m = 1lu << (LDBL_MANL_SIZE - 1);
34 for (b = LDBL_MANH_SIZE; !(u.bits.manl & m); m >>= 1)
37 m = 1lu << (LDBL_MANH_SIZE - 1);
38 for (b = 0; !(u.bits.manh & m); m >>= 1)
41 #ifdef LDBL_IMPLICIT_NBIT
44 return (LDBL_MIN_EXP - b - 1);
45 } else if (u.bits.exp < (LDBL_MAX_EXP << 1) - 1)
46 return (u.bits.exp - LDBL_MAX_EXP + 1);
47 else if (u.bits.manl != 0 || u.bits.manh != 0)