TODO updated and small cleanups

EvenPerfectBitScanner/CalculationResultHandler.cs

@@ -1,12 +1,11 @@
 using System.Buffers.Text;
-using System.IO;
 using System.Runtime.CompilerServices;
 using System.Text;
-using System.Threading;
 using PerfectNumbers.Core;
 
 namespace EvenPerfectBitScanner;
 
+// TODO: Convert this struct to an equivalent of a static class. Make all fields / properties / methods static and initialize it during program startup. Don't check if it's initialized within. Rely on the flow enforcing it.
 internal struct CalculationResultHandler
 {
 	private const string ResultsHeader = "p,searchedMersenne,detailedCheck,passedAllTests";
@@ -26,8 +25,8 @@ internal struct CalculationResultHandler
 	private int _primeCount;
 	private bool _primeFoundAfterInit;
 
-    private bool IsInitialized => _sync is not null;
+	private readonly bool IsInitialized => _sync is not null;
-    private bool HasFileSync => _fileWriteSync is not null;
+	private readonly bool HasFileSync => _fileWriteSync is not null;
 
 	internal CalculationResultHandler(string resultsFileName, int writeBatchSize)
 	{
@@ -43,7 +42,7 @@ internal struct CalculationResultHandler
 		_primeFoundAfterInit = false;
 	}
 
-    internal string ResultsFileName => _resultsFileName;
+	internal readonly string ResultsFileName => _resultsFileName;
 
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
 	internal void InitializeOutputBuffer()
@@ -262,7 +261,7 @@ internal struct CalculationResultHandler
 	}
 
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
-    private int TryFormatResultLine(Span<byte> destination, ulong currentP, bool searchedMersenne, bool detailedCheck, bool passedAllTests)
+	private readonly int TryFormatResultLine(Span<byte> destination, ulong currentP, bool searchedMersenne, bool detailedCheck, bool passedAllTests)
 	{
 		int offset = 0;
 

EvenPerfectBitScanner/Program.cs

@@ -276,7 +276,7 @@ internal static class Program
                 orderWarmupLimitOverride ?? 5_000_000UL,
                 NttGpuMath.ReductionMode,
                 mersenneOnGpu ? "gpu" : "cpu",
-                (GpuContextPool.ForceCpu ? "cpu" : "gpu"),
+                GpuContextPool.ForceCpu ? "cpu" : "gpu",
                 orderOnGpu ? "gpu" : "cpu");
         
                 if (!string.IsNullOrEmpty(_cliArguments.ResultsPrefix))
@@ -418,6 +418,7 @@ internal static class Program
                 GpuPrimeWorkLimiter.SetLimit(gpuPrimeThreads);
                 // Configure batch size for GPU primality sieve
                 PrimeTester.GpuBatchSize = gpuPrimeBatch;
+				CalculationResultHandler resultHandler = _resultHandler;
         
                 Stopwatch? stopwatch = null;
                 if (testMode)
@@ -436,7 +437,7 @@ internal static class Program
                             _byDivisorStartPrime,
                             static () => _lastCompositeP = true,
                             static () => _lastCompositeP = false,
-                            PrintResult,
+                            static (candidate, searchedMersenne, detailedCheck, passedAllTests) => _resultHandler.HandleResult(candidate, searchedMersenne, detailedCheck, passedAllTests, _lastCompositeP),
                             threadCount);
                     _resultHandler.FlushBuffer();
                     _resultHandler.ReleaseOutputBuffer();
@@ -494,7 +495,7 @@ internal static class Program
                                 {
                                     p = buffer[j];
                                     passedAllTests = IsEvenPerfectCandidate(p, divisorCyclesSearchLimit, out searchedMersenne, out detailedCheck);
-                                    PrintResult(p, searchedMersenne, detailedCheck, passedAllTests);
+									resultHandler.HandleResult(p, searchedMersenne, detailedCheck, passedAllTests, _lastCompositeP);
                                 }
         
                                 continue;
@@ -517,7 +518,7 @@ internal static class Program
                                 }
         
                                 passedAllTests = IsEvenPerfectCandidate(p, divisorCyclesSearchLimit, out searchedMersenne, out detailedCheck);
-                                PrintResult(p, searchedMersenne, detailedCheck, passedAllTests);
+								resultHandler.HandleResult(p, searchedMersenne, detailedCheck, passedAllTests, _lastCompositeP);
         
                                 if (p == maxP)
                                 {
@@ -715,6 +716,7 @@ internal static class Program
     }
 
 
+	// TODO: Move this to CliArguments
 	private static void PrintHelp()
 	{
 		Console.WriteLine("Usage: EvenPerfectBitScanner [options]");
@@ -750,7 +752,6 @@ internal static class Program
 		Console.WriteLine("  --divisor-cycles-continue  continue divisor cycles generation");
 		Console.WriteLine("  --divisor-cycles-limit=<value> cycle search iterations when --mersenne=divisor");
 		Console.WriteLine("  --use-order            test primality via q order");
-        // mod-automaton removed
 		Console.WriteLine("  --filter-p=<path>      process only p from previous run results (required for --mersenne=bydivisor)");
 		Console.WriteLine("  --write-batch-size=<value> overwrite frequency of disk writes (default 100 lines)");
 		Console.WriteLine("  --gcd-filter           enable early sieve based on GCD");
@@ -895,16 +896,6 @@ internal static class Program
         }
     }
 
-
-
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    private static void PrintResult(ulong currentP, bool searchedMersenne, bool detailedCheck, bool passedAllTests)
-    {
-        bool lastWasComposite = _lastCompositeP;
-        _resultHandler.HandleResult(currentP, searchedMersenne, detailedCheck, passedAllTests, lastWasComposite);
-    }
-
     private static void ReportTestTime(TimeSpan elapsed)
     {
         double elapsedSeconds = elapsed.TotalSeconds;
@@ -1242,6 +1233,7 @@ internal static class Program
         return false;
     }
 
+	// TODO: Convert this to extension method in ULongExtensions if one doesn't already exist. We may already calculate things like these
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private static void ComputeBitStats(ulong value, out int bitLen, out int zeroCount, out int maxZeroBlock)
     {
@@ -1403,9 +1395,11 @@ internal static class Program
         }
     }
 
+	// TODO: Convert this to extension method in ULongExtensions if one doesn't already exist
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     internal static bool IsCompositeByGcd(ulong p)
 	{
+		// TODO: Can this ever be true on Program's execution path?
         if (p < 2)
         {
             return true;
@@ -1415,9 +1409,11 @@ internal static class Program
         return BinaryGcd(p, m) > 1UL;
     }
 
+	// TODO: Convert this to extension method in ULongExtensions if one doesn't already exist
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
     private static ulong BinaryGcd(ulong a, ulong b)
 	{
+		// TODO: Are these a & b conditions ever met on Program's execution path?
         if (a == 0UL)
         {
             return b;