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8276162: Optimise unsigned comparison pattern

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Reviewed-by: thartmann, kvn
This commit is contained in:
MeryKitty 2021-11-16 14:09:53 +00:00 • committed by Tobias Hartmann
parent 9a9a157a7d
commit f3eb5014aa
3 changed files with 521 additions and 5 deletions
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138
test/micro/org/openjdk/bench/vm/compiler/UnsignedComparison.java Normal file
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/*
* Copyright (c) 2021, 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.
*/
package org.openjdk.bench.vm.compiler;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.infra.Blackhole;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Fork(2)
@State(Scope.Thread)
public class UnsignedComparison {
private static final int ITERATIONS = 1000;
private static final int CONST_OPERAND = 4;
private static final int INT_MIN = Integer.MIN_VALUE;
private static final long LONG_MIN = Long.MIN_VALUE;
int arg0 = 0, arg1 = 4;
@Setup(Level.Invocation)
public void toggle() {
arg0 = (arg0 + 1) & 7;
}
@Benchmark
public void intVarDirect(Blackhole bh) {
for (int i = 0; i < ITERATIONS; i++) {
bh.consume(arg0 + INT_MIN < arg1 + INT_MIN);
}
}
@Benchmark
public void intVarLibLT(Blackhole bh) {
for (int i = 0; i < ITERATIONS; i++) {
bh.consume(Integer.compareUnsigned(arg0, arg1) < 0);
}
}
@Benchmark
public void intVarLibGT(Blackhole bh) {
for (int i = 0; i < ITERATIONS; i++) {
bh.consume(Integer.compareUnsigned(arg0, arg1) > 0);
}
}
@Benchmark
public void intConDirect(Blackhole bh) {
for (int i = 0; i < ITERATIONS; i++) {
bh.consume(arg0 + INT_MIN < CONST_OPERAND + INT_MIN);
}
}
@Benchmark
public void intConLibLT(Blackhole bh) {
for (int i = 0; i < ITERATIONS; i++) {
bh.consume(Integer.compareUnsigned(arg0, CONST_OPERAND) < 0);
}
}
@Benchmark
public void intConLibGT(Blackhole bh) {
for (int i = 0; i < ITERATIONS; i++) {
bh.consume(Integer.compareUnsigned(arg0, CONST_OPERAND) > 0);
}
}
@Benchmark
public void longVarDirect(Blackhole bh) {
for (int i = 0; i < ITERATIONS; i++) {
bh.consume(arg0 + LONG_MIN < arg1 + LONG_MIN);
}
}
@Benchmark
public void longVarLibLT(Blackhole bh) {
for (int i = 0; i < ITERATIONS; i++) {
bh.consume(Long.compareUnsigned(arg0, arg1) < 0);
}
}
@Benchmark
public void longVarLibGT(Blackhole bh) {
for (int i = 0; i < ITERATIONS; i++) {
bh.consume(Long.compareUnsigned(arg0, arg1) > 0);
}
}
@Benchmark
public void longConDirect(Blackhole bh) {
for (int i = 0; i < ITERATIONS; i++) {
bh.consume(arg0 + LONG_MIN < CONST_OPERAND + LONG_MIN);
}
}
@Benchmark
public void longConLibLT(Blackhole bh) {
for (int i = 0; i < ITERATIONS; i++) {
bh.consume(Long.compareUnsigned(arg0, CONST_OPERAND) < 0);
}
}
@Benchmark
public void longConLibGT(Blackhole bh) {
for (int i = 0; i < ITERATIONS; i++) {
bh.consume(Long.compareUnsigned(arg0, CONST_OPERAND) > 0);
}
}
}