1 /* Emulation for ldexpl.
2 Contributed by Paolo Bonzini
4 Copyright 2002, 2003, 2007 Free Software Foundation, Inc.
6 This file is part of gnulib.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation,
20 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
32 ldexpl(long double x, int exp)
36 DECL_LONG_DOUBLE_ROUNDING
38 BEGIN_LONG_DOUBLE_ROUNDING ();
40 /* Check for zero, nan and infinity. */
41 if (!(isnanl (x) || x + x == x))
54 /* Invariant: Here bit = 2^i, factor = 2^-2^i or = 2^2^i,
61 factor = factor * factor;
65 END_LONG_DOUBLE_ROUNDING ();
76 for (y = 0; y < 29; y++)
77 printf ("%5d %.16Lg %.16Lg\n", y, ldexpl(0.8L, y), ldexpl(0.8L, -y) * ldexpl(0.8L, y));