75 lines
3.0 KiB
C++
75 lines
3.0 KiB
C++
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "precompiled.hpp"
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#include "gc/z/zUtils.inline.hpp"
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#include "unittest.hpp"
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#include <limits>
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template <typename T>
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static T max_alignment() {
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T max = std::numeric_limits<T>::max();
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return max ^ (max >> 1);
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}
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TEST(ZUtilsTest, round_up_power_of_2) {
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EXPECT_EQ(ZUtils::round_up_power_of_2(1u), 1u);
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EXPECT_EQ(ZUtils::round_up_power_of_2(2u), 2u);
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EXPECT_EQ(ZUtils::round_up_power_of_2(3u), 4u);
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EXPECT_EQ(ZUtils::round_up_power_of_2(4u), 4u);
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EXPECT_EQ(ZUtils::round_up_power_of_2(5u), 8u);
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EXPECT_EQ(ZUtils::round_up_power_of_2(6u), 8u);
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EXPECT_EQ(ZUtils::round_up_power_of_2(7u), 8u);
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EXPECT_EQ(ZUtils::round_up_power_of_2(8u), 8u);
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EXPECT_EQ(ZUtils::round_up_power_of_2(9u), 16u);
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EXPECT_EQ(ZUtils::round_up_power_of_2(10u), 16u);
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EXPECT_EQ(ZUtils::round_up_power_of_2(1023u), 1024u);
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EXPECT_EQ(ZUtils::round_up_power_of_2(1024u), 1024u);
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EXPECT_EQ(ZUtils::round_up_power_of_2(1025u), 2048u);
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const size_t max = max_alignment<size_t>();
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EXPECT_EQ(ZUtils::round_up_power_of_2(max - 1), max);
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EXPECT_EQ(ZUtils::round_up_power_of_2(max), max);
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}
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TEST(ZUtilsTest, round_down_power_of_2) {
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EXPECT_EQ(ZUtils::round_down_power_of_2(1u), 1u);
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EXPECT_EQ(ZUtils::round_down_power_of_2(2u), 2u);
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EXPECT_EQ(ZUtils::round_down_power_of_2(3u), 2u);
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EXPECT_EQ(ZUtils::round_down_power_of_2(4u), 4u);
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EXPECT_EQ(ZUtils::round_down_power_of_2(5u), 4u);
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EXPECT_EQ(ZUtils::round_down_power_of_2(6u), 4u);
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EXPECT_EQ(ZUtils::round_down_power_of_2(7u), 4u);
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EXPECT_EQ(ZUtils::round_down_power_of_2(8u), 8u);
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EXPECT_EQ(ZUtils::round_down_power_of_2(9u), 8u);
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EXPECT_EQ(ZUtils::round_down_power_of_2(10u), 8u);
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EXPECT_EQ(ZUtils::round_down_power_of_2(1023u), 512u);
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EXPECT_EQ(ZUtils::round_down_power_of_2(1024u), 1024u);
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EXPECT_EQ(ZUtils::round_down_power_of_2(1025u), 1024u);
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const size_t max = max_alignment<size_t>();
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EXPECT_EQ(ZUtils::round_down_power_of_2(max), max);
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EXPECT_EQ(ZUtils::round_down_power_of_2(max - 1), max / 2);
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}
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