1 /* Test of multiplying a 'long double' by a power of 2.
2 Copyright (C) 2007 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
28 #include "isnanl-nolibm.h"
30 #define ASSERT(expr) if (!(expr)) abort ();
38 DECL_LONG_DOUBLE_ROUNDING
40 BEGIN_LONG_DOUBLE_ROUNDING ();
44 y = ldexpl (x, 0); ASSERT (isnanl (y));
45 y = ldexpl (x, 5); ASSERT (isnanl (y));
46 y = ldexpl (x, -5); ASSERT (isnanl (y));
49 { /* Positive infinity. */
51 y = ldexpl (x, 0); ASSERT (y == x);
52 y = ldexpl (x, 5); ASSERT (y == x);
53 y = ldexpl (x, -5); ASSERT (y == x);
56 { /* Negative infinity. */
58 y = ldexpl (x, 0); ASSERT (y == x);
59 y = ldexpl (x, 5); ASSERT (y == x);
60 y = ldexpl (x, -5); ASSERT (y == x);
63 { /* Positive zero. */
65 y = ldexpl (x, 0); ASSERT (y == x);
66 y = ldexpl (x, 5); ASSERT (y == x);
67 y = ldexpl (x, -5); ASSERT (y == x);
70 { /* Negative zero. */
72 y = ldexpl (x, 0); ASSERT (y == x);
73 y = ldexpl (x, 5); ASSERT (y == x);
74 y = ldexpl (x, -5); ASSERT (y == x);
77 { /* Positive finite number. */
79 y = ldexpl (x, 0); ASSERT (y == x);
80 y = ldexpl (x, 5); ASSERT (y == x * 32.0L);
81 y = ldexpl (x, -5); ASSERT (y == x * 0.03125L);
84 { /* Negative finite number. */
85 x = -20.085536923187667742L;
86 y = ldexpl (x, 0); ASSERT (y == x);
87 y = ldexpl (x, 5); ASSERT (y == x * 32.0L);
88 y = ldexpl (x, -5); ASSERT (y == x * 0.03125L);
91 for (i = 1, x = 1.73205L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
93 y = ldexpl (x, 0); ASSERT (y == x);
94 y = ldexpl (x, 5); ASSERT (y == x * 32.0L);
95 y = ldexpl (x, -5); ASSERT (y == x * 0.03125L);
97 for (i = 1, x = 1.73205L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
99 y = ldexpl (x, 0); ASSERT (y == x);
100 y = ldexpl (x, 5); ASSERT (y == x * 32.0L);
101 if (i - 5 >= LDBL_MIN_EXP)
103 y = ldexpl (x, -5); ASSERT (y == x * 0.03125L);
106 for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
108 y = ldexpl (x, 0); ASSERT (y == x);
109 y = ldexpl (x, 5); ASSERT (y == x * 32.0L);