Allocate single byte keys once (#7952)

NethermindEth · Dec 21, 2024 · 641c96e · 641c96e
1 parent f8918a9
commit 641c96e
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/Nethermind/Nethermind.Trie/PatriciaTree.cs b/src/Nethermind/Nethermind.Trie/PatriciaTree.cs
@@ -26,6 +26,8 @@ namespace Nethermind.Trie
     public class PatriciaTree
     {
         private const int MaxKeyStackAlloc = 64;
+        private readonly static byte[][] _singleByteKeys = [[0], [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15]];
+
         private readonly ILogger _logger;
 
         public const int OneNodeAvgMemoryEstimate = 384;
@@ -733,7 +735,7 @@ L X - - - - - - - - - - - - - - */
                             if (childNode.IsBranch)
                             {
                                 TrieNode extensionFromBranch =
-                                    TrieNodeFactory.CreateExtension(new[] { (byte)childNodeIndex }, childNode);
+                                    TrieNodeFactory.CreateExtension(_singleByteKeys[childNodeIndex], childNode);
                                 if (_logger.IsTrace)
                                     _logger.Trace(
                                         $"Extending child {childNodeIndex} {childNode} of {node} into {extensionFromBranch}");