| /* |
| * 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 "gc/z/zUtils.inline.hpp" |
| #include "unittest.hpp" |
| |
| #include <limits> |
| |
| template <typename T> |
| static T max_alignment() { |
| T max = std::numeric_limits<T>::max(); |
| return max ^ (max >> 1); |
| } |
| |
| TEST(ZUtilsTest, round_up_power_of_2) { |
| EXPECT_EQ(ZUtils::round_up_power_of_2(1u), 1u); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(2u), 2u); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(3u), 4u); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(4u), 4u); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(5u), 8u); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(6u), 8u); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(7u), 8u); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(8u), 8u); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(9u), 16u); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(10u), 16u); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(1023u), 1024u); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(1024u), 1024u); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(1025u), 2048u); |
| |
| const size_t max = max_alignment<size_t>(); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(max - 1), max); |
| EXPECT_EQ(ZUtils::round_up_power_of_2(max), max); |
| } |
| |
| TEST(ZUtilsTest, round_down_power_of_2) { |
| EXPECT_EQ(ZUtils::round_down_power_of_2(1u), 1u); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(2u), 2u); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(3u), 2u); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(4u), 4u); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(5u), 4u); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(6u), 4u); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(7u), 4u); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(8u), 8u); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(9u), 8u); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(10u), 8u); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(1023u), 512u); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(1024u), 1024u); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(1025u), 1024u); |
| |
| const size_t max = max_alignment<size_t>(); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(max), max); |
| EXPECT_EQ(ZUtils::round_down_power_of_2(max - 1), max / 2); |
| } |