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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package org.openjdk.bench.vm.compiler;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.CompilerControl;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Warmup;
import org.openjdk.jmh.infra.Blackhole;

import java.util.concurrent.TimeUnit;

/**
 * Tests transformation that converts `~x` into `-1-x` when `~x` is
 * used in an arithmetic expression.
 */
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
@Warmup(iterations = 20, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 20, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(value = 3)
public class NotOpTransformation {

    private static final int I_C = 1234567;

    private static final long L_C = 123_456_789_123_456L;

    private int iFld = 4711;

    private long lFld = 4711 * 4711 * 4711;

    @Benchmark
    public void baselineInt(Blackhole bh) {
        bh.consume(iFld);
    }

    @Benchmark
    public void baselineLong(Blackhole bh) {
        bh.consume(lFld);
    }

    // Convert c-(~x)-x into c-(-1-x)-x, which is finally converted
    // into c+1.
    @Benchmark
    public void testInt1(Blackhole bh) {
        bh.consume(I_C - (~iFld) - iFld);
    }

    // Convert ~(c-x)-x into -1-(c-x)-x, which is finally converted
    // into -1-c.
    @Benchmark
    public void testInt2(Blackhole bh) {
        bh.consume(~(I_C - iFld) - iFld);
    }

    // Convert c-(~x)-x into c-(-1-x)-x, which is finally converted
    // into c+1.
    @Benchmark
    public void testLong1(Blackhole bh) {
        bh.consume(L_C - (~lFld) - lFld);
    }

    // Convert ~(c-x)-x into -1-(c-x)-x, which is finally converted
    // into -1-c.
    @Benchmark
    public void testLong2(Blackhole bh) {
        bh.consume(~(L_C - lFld) - lFld);
    }
}