Merge branch 'codex/optimize-evenperfectbitscanner-for-static-arrays' from github

PerfectNumbers.Core/Gpu/GpuStaticTableInitializer.cs

@@ -0,0 +1,44 @@
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using ILGPU;
+using ILGPU.Runtime;
+using PerfectNumbers.Core;
+
+namespace PerfectNumbers.Core.Gpu;
+
+internal static class GpuStaticTableInitializer
+{
+    private static readonly ConcurrentDictionary<Accelerator, byte> Initialized = new(AcceleratorReferenceComparer.Instance);
+
+    internal static void EnsureStaticTables(Accelerator accelerator)
+    {
+        if (accelerator is null)
+        {
+            return;
+        }
+
+        Initialized.GetOrAdd(accelerator, static acc =>
+        {
+            PrimeTester.PrimeTesterGpuContextPool.EnsureStaticTables(acc);
+            GpuKernelPool.PreloadStaticTables(acc);
+            PrimeOrderGpuHeuristics.PreloadStaticTables(acc);
+            return 0;
+        });
+    }
+
+    private sealed class AcceleratorReferenceComparer : IEqualityComparer<Accelerator>
+    {
+        internal static AcceleratorReferenceComparer Instance { get; } = new();
+
+        public bool Equals(Accelerator? x, Accelerator? y)
+        {
+            return ReferenceEquals(x, y);
+        }
+
+        public int GetHashCode(Accelerator obj)
+        {
+            return RuntimeHelpers.GetHashCode(obj);
+        }
+    }
+}