Add GPU prime tester overload for preallocated buffers

PerfectNumbers.Core.Tests/Gpu/PrimeTesterGpuTests.cs

@@ -1,4 +1,6 @@
 using FluentAssertions;
+using ILGPU;
+using ILGPU.Runtime;
 using PerfectNumbers.Core.Gpu;
 using Xunit;
 
@@ -27,6 +29,34 @@ public class PrimeTesterGpuTests
         }
     }
 
+    [Fact]
+    public void IsPrimeBatchGpu_with_preallocated_resources_marks_expected_values()
+    {
+        GpuContextPool.ForceCpu = false;
+        using var context = Context.CreateDefault();
+        using var accelerator = context.GetPreferredDevice(false).CreateAccelerator(context);
+
+        try
+        {
+            ulong[] values = [31UL, 33UL, 37UL, 39UL];
+            byte[] results = new byte[values.Length];
+
+            using var inputBuffer = accelerator.Allocate1D<ulong>(values.Length);
+            using var outputBuffer = accelerator.Allocate1D<byte>(values.Length);
+            ulong[] staging = new ulong[values.Length];
+
+            PrimeTester.IsPrimeBatchGpu(values, results, accelerator, inputBuffer, outputBuffer, staging);
+
+            results.Should().Equal(new byte[] { 1, 0, 1, 0 });
+        }
+        finally
+        {
+            PrimeTester.ClearGpuCaches(accelerator);
+            GpuContextPool.ForceCpu = false;
+            GpuContextPool.DisposeAll();
+        }
+    }
+
     [Fact]
     public void IsPrimeGpu_rejects_composites()
     {