| /* |
| * Copyright (C) 2022 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.libcore.regression; |
| |
| import android.perftests.utils.BenchmarkState; |
| import android.perftests.utils.PerfStatusReporter; |
| import android.test.suitebuilder.annotation.LargeTest; |
| |
| import androidx.test.runner.AndroidJUnit4; |
| |
| import org.junit.Rule; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| |
| @RunWith(AndroidJUnit4.class) |
| @LargeTest |
| public class IntConstantDivisionPerfTest { |
| @Rule public PerfStatusReporter mPerfStatusReporter = new PerfStatusReporter(); |
| |
| @Test |
| public void timeDivideIntByConstant2() { |
| int result = 1; |
| BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| while (state.keepRunning()) { |
| result /= 2; |
| } |
| } |
| |
| @Test |
| public void timeDivideIntByConstant8() { |
| int result = 1; |
| BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| while (state.keepRunning()) { |
| result /= 8; |
| } |
| } |
| |
| @Test |
| public void timeDivideIntByConstant10() { |
| int result = 1; |
| BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| while (state.keepRunning()) { |
| result /= 10; |
| } |
| } |
| |
| @Test |
| public void timeDivideIntByConstant100() { |
| int result = 1; |
| BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| while (state.keepRunning()) { |
| result /= 100; |
| } |
| } |
| |
| @Test |
| public void timeDivideIntByConstant100_HandOptimized() { |
| int result = 1; |
| BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| while (state.keepRunning()) { |
| result = (int) ((0x51eb851fL * result) >>> 37); |
| } |
| } |
| |
| @Test |
| public void timeDivideIntByConstant2048() { |
| int result = 1; |
| BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| while (state.keepRunning()) { |
| result /= 2048; |
| } |
| } |
| |
| @Test |
| public void timeDivideIntByVariable2() { |
| int result = 1; |
| int factor = 2; |
| BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| while (state.keepRunning()) { |
| result /= factor; |
| } |
| } |
| |
| @Test |
| public void timeDivideIntByVariable10() { |
| int result = 1; |
| int factor = 10; |
| BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| while (state.keepRunning()) { |
| result /= factor; |
| } |
| } |
| } |