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CanonicalizeInductionVariableBenchmark.java
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CanonicalizeInductionVariableBenchmark.java
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/*
* JVM Performance Benchmarks
*
* Copyright (C) 2019 - 2024 Ionut Balosin
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 com.ionutbalosin.jvm.performance.benchmarks.compiler;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
/*
* This transformation analyzes and transforms the induction variables (and computations derived from them) into
* simpler forms suitable for subsequent analysis and transformation.
* This optimization is a special case of strength reduction where all loop iterations are strengthened
* to a mathematical formula.
*
* References:
* - https://llvm.org/docs/Passes.html#indvars-canonicalize-induction-variables
*/
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 5, time = 10, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 10, timeUnit = TimeUnit.SECONDS)
@Fork(value = 5)
@State(Scope.Thread)
public class CanonicalizeInductionVariableBenchmark {
// $ java -jar */*/benchmarks.jar ".*CanonicalizeInductionVariableBenchmark.*"
// Make sure the multiplication uses longs but not ints
// Formula: reducedLength = sqrt(length) - start
private final long length = 4202496L * 4202496L;
private final long reducedLength = 4194304L;
private final long start = 8192;
@Benchmark
public long canonicalize() {
return auto_canonicalize(length);
}
@Benchmark
public long baseline() {
return baseline(reducedLength);
}
@Benchmark
public long manual_canonicalize() {
return (long) Math.sqrt(length) - start;
}
private long auto_canonicalize(final long iterations) {
long result = 0;
for (long l = start; l * l < iterations; ++l) {
result++;
}
return result;
}
private long baseline(final long iterations) {
long result;
for (result = 0; result != iterations; ++result) {}
return result;
}
}