be/src/kudu/util/bit-util-test.cc

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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
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#include <boost/utility/binary.hpp>
#include <gtest/gtest.h>
#include "kudu/util/bit-util.h"

namespace kudu {

TEST(BitUtil, TrailingBits) {
  EXPECT_EQ(BitUtil::TrailingBits(BOOST_BINARY(1 1 1 1 1 1 1 1), 0), 0);
  EXPECT_EQ(BitUtil::TrailingBits(BOOST_BINARY(1 1 1 1 1 1 1 1), 1), 1);
  EXPECT_EQ(BitUtil::TrailingBits(BOOST_BINARY(1 1 1 1 1 1 1 1), 64),
            BOOST_BINARY(1 1 1 1 1 1 1 1));
  EXPECT_EQ(BitUtil::TrailingBits(BOOST_BINARY(1 1 1 1 1 1 1 1), 100),
            BOOST_BINARY(1 1 1 1 1 1 1 1));
  EXPECT_EQ(BitUtil::TrailingBits(0, 1), 0);
  EXPECT_EQ(BitUtil::TrailingBits(0, 64), 0);
  EXPECT_EQ(BitUtil::TrailingBits(1LL << 63, 0), 0);
  EXPECT_EQ(BitUtil::TrailingBits(1LL << 63, 63), 0);
  EXPECT_EQ(BitUtil::TrailingBits(1LL << 63, 64), 1LL << 63);

}

TEST(BitUtil, ShiftBits) {
  EXPECT_EQ(BitUtil::ShiftLeftZeroOnOverflow(1ULL, 64), 0ULL);
  EXPECT_EQ(BitUtil::ShiftLeftZeroOnOverflow(0xFFFFFFFFFFFFFFFFULL, 32), 0xFFFFFFFF00000000ULL);
  EXPECT_EQ(BitUtil::ShiftRightZeroOnOverflow(1ULL, 64), 0ULL);
  EXPECT_EQ(BitUtil::ShiftRightZeroOnOverflow(0xFFFFFFFFFFFFFFFFULL, 32), 0x00000000FFFFFFFFULL);
}

} // namespace kudu