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 3 of the License, or
11 (at your option) any later version.
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
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
31 ldexpl(long double x, int exp)
35 DECL_LONG_DOUBLE_ROUNDING
37 BEGIN_LONG_DOUBLE_ROUNDING ();
39 /* Check for zero, nan and infinity. */
40 if (!(isnanl (x) || x + x == x))
53 /* Invariant: Here bit = 2^i, factor = 2^-2^i or = 2^2^i,
60 factor = factor * factor;
64 END_LONG_DOUBLE_ROUNDING ();
75 for (y = 0; y < 29; y++)
76 printf ("%5d %.16Lg %.16Lg\n", y, ldexpl(0.8L, y), ldexpl(0.8L, -y) * ldexpl(0.8L, y));