constant-folding

 private double x = Math.PI;

    @GenerateMicroBenchmark
    public void baseline() {
        // do nothing, this is a baseline
    }

    @GenerateMicroBenchmark
    public double measureWrong() {
        // This is wrong: the result is provably the same, optimized out.
        return Math.log(Math.PI);
    }

    @GenerateMicroBenchmark
    public double measureRight() {
        // This is correct: the result is being used.
        return Math.log(x);
    }