Reapply modulo helpers and inline fast remainders

EvenPerfectBitScanner.Benchmarks/Mod8UInt128Benchmarks.cs

@@ -0,0 +1,27 @@
+using System.Numerics;
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Jobs;
+using PerfectNumbers.Core;
+
+namespace EvenPerfectBitScanner.Benchmarks;
+
+[SimpleJob(RuntimeMoniker.Net80, launchCount: 1, warmupCount: 1, iterationCount: 5)]
+[MemoryDiagnoser]
+public class Mod8UInt128Benchmarks
+{
+    [Params(8UL, 8191UL, 131071UL, 2147483647UL, ulong.MaxValue - 255UL)]
+    public UInt128 Value { get; set; }
+
+    [Benchmark(Baseline = true)]
+    public ulong ModuloOperator()
+    {
+        return (ulong)(Value % 8UL);
+    }
+
+    [Benchmark]
+    public ulong ExtensionMethod()
+    {
+        return Value.Mod8();
+    }
+}
+