Fast path Array::Resize with small arrays.

mono · Mar 25, 2013 · 4189fe3 · 4189fe3
1 parent 694f00b
commit 4189fe3
Showing 1 changed file with 8 additions and 2 deletions.
diff --git a/mcs/class/corlib/System/Array.cs b/mcs/class/corlib/System/Array.cs
@@ -2808,8 +2808,14 @@ public static void Resize<T> (ref T [] array, int newSize)
 				return;
 
 			T [] a = new T [newSize];
-			if (length != 0)
-				FastCopy (arr, 0, a, 0, Math.Min (newSize, length));
+			int tocopy = Math.Min (newSize, length);
+
+			if (tocopy < 9) {
+				for (int i = 0; i < tocopy; ++i)
+					UnsafeStore (a, i, UnsafeLoad (arr, i));
+			} else {
+				FastCopy (arr, 0, a, 0, tocopy);
+			}
 			array = a;
 		}