added RcSpans util

src/DotRecast.Core/RcArrays.cs

@@ -12,15 +12,6 @@ namespace DotRecast.Core
             Array.Copy(sourceArray, sourceIndex, destinationArray, destinationIndex, length);
         }
 
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static void Copy<T>(Span<T> sourceArray, int sourceIndex, Span<T> destinationArray, int destinationIndex, int length)
-        {
-            var src = sourceArray.Slice(sourceIndex, length);
-            var dst = destinationArray.Slice(destinationIndex);
-            src.CopyTo(dst);
-        }
-
-
         // Type Safe Copy
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void Copy<T>(T[] sourceArray, T[] destinationArray, long length)

src/DotRecast.Core/RcSpans.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Runtime.CompilerServices;
+
+namespace DotRecast.Core
+{
+    public static class RcSpans
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void Copy<T>(Span<T> source, Span<T> destination)
+        {
+            Copy(source, 0, destination, 0, source.Length);
+        }
+        
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void Copy<T>(Span<T> source, int sourceIdx, Span<T> destination, int destinationIdx, int length)
+        {
+            var src = source.Slice(sourceIdx, length);
+            var dst = destination.Slice(destinationIdx);
+            src.CopyTo(dst);
+        }
+    }
+}

test/DotRecast.Core.Test/RcArrayBenchmarkTests.cs

@@ -134,9 +134,7 @@ public class RcArrayBenchmarkTests
             var resultSpan = Bench($"Span<long[], {list[seq].src.Length}>", _ =>
             {
                 var v = list[seq];
-                Span<long> src = v.src;
+                RcSpans.Copy<long>(v.src, 0, v.dest, 0, v.src.Length);
-                Span<long> dest = v.dest;
-                RcArrays.Copy(src, 0, dest, 0, src.Length);
             });
 
 
@@ -154,7 +152,6 @@ public class RcArrayBenchmarkTests
             {
                 Console.WriteLine("");
             }
-                
         }
     }
 }