1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/*
* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "utilities/count_trailing_zeros.hpp"
#include "utilities/globalDefinitions.hpp"
#include "unittest.hpp"
TEST(count_trailing_zeros, one_or_two_set_bits) {
unsigned i = 0; // Position of a set bit.
for (uintx ix = 1; ix != 0; ix <<= 1, ++i) {
unsigned j = 0; // Position of a set bit.
for (uintx jx = 1; jx != 0; jx <<= 1, ++j) {
uintx value = ix | jx;
EXPECT_EQ(MIN2(i, j), count_trailing_zeros(value))
<< "value = " << value;
}
}
}
TEST(count_trailing_zeros, all_ones_followed_by_all_zeros) {
unsigned i = BitsPerWord - 1; // Index of most significant set bit.
uintx value = ~(uintx)0;
for ( ; value != 0; value >>= 1, --i) {
EXPECT_EQ(0u, count_trailing_zeros(value))
<< "value = " << value;
}
}
TEST(count_trailing_zeros, all_zeros_followed_by_all_ones) {
unsigned i = 0; // Index of least significant set bit.
uintx value = ~(uintx)0;
for ( ; value != 0; value <<= 1, ++i) {
EXPECT_EQ(i, count_trailing_zeros(value))
<< "value = " << value;
}
}
|
