Throw helper benchmark

program.cs

using BenchmarkDotNet;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Diagnosers;
using BenchmarkDotNet.Engines;
using BenchmarkDotNet.Running;

BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run();

[HardwareCounters(HardwareCounter.BranchInstructions, HardwareCounter.BranchMispredictions)]
[SimpleJob(RunStrategy.Throughput)]
public class C {
    [Benchmark(Baseline = true)]
    public int BenchInline() {
        int x = 0;
        for(int i = 0; i < 100_000; i++)
        {
            try {
                x += WithInlineException(i % 100_000 == 0 ? null : i);
            } catch(ArgumentNullException) { }
        }
        return x;
    }

    [Benchmark]
    public int BenchThrowHelper() {
        int x = 0;
        for(int i = 0; i < 100_000; i++)
        {
            try {
                x += WithThrowHelper(i % 100_000 == 0 ? null : i);
            } catch(ArgumentNullException) { }
        }
        return x;
    }

    public int WithInlineException(int? num)
    => num switch
    {
        null => throw new ArgumentNullException(nameof(num)),
        int n => n
    };

    public int WithThrowHelper(int? num) {
        return num switch {
            null => ThrowHelperNullArgument(),
            int n => n
        };
        
        [System.Diagnostics.CodeAnalysis.DoesNotReturn]
        static int ThrowHelperNullArgument() => throw new ArgumentNullException(nameof(num));
    }
}