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// bits_test.cpp
/* Copyright 2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/platform/bits.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
TEST(BitsTest_CountZeros, Constants) {
ASSERT_EQUALS(countLeadingZeros64(0ull), 64);
ASSERT_EQUALS(countTrailingZeros64(0ull), 64);
ASSERT_EQUALS(countLeadingZeros64(0x1234ull), 64 - 13);
ASSERT_EQUALS(countTrailingZeros64(0x1234ull), 2);
ASSERT_EQUALS(countLeadingZeros64(0x1234ull << 32), 32 - 13);
ASSERT_EQUALS(countTrailingZeros64(0x1234ull << 32), 2 + 32);
ASSERT_EQUALS(countLeadingZeros64((0x1234ull << 32) | 0x1234ull), 32 - 13);
ASSERT_EQUALS(countTrailingZeros64((0x1234ull << 32) | 0x1234ull), 2);
}
TEST(BitsTest_CountZeros, EachBit) {
for (int i = 0; i < 64; i++) {
unsigned long long x = 1ULL << i;
ASSERT_EQUALS(countLeadingZeros64(x), 64 - 1 - i);
ASSERT_EQUALS(countTrailingZeros64(x), i);
}
}
}
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