From 58af13148543cb07186be3daf7fb51a84ffe0152 Mon Sep 17 00:00:00 2001
From: de4dot <de4dot@gmail.com>
Date: Thu, 20 Oct 2011 12:29:19 +0200
Subject: [PATCH] Add code to remove dup + pop

---
 blocks/cflow/DeadCodeRemover.cs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/blocks/cflow/DeadCodeRemover.cs b/blocks/cflow/DeadCodeRemover.cs
index 413665ab..24ddac1f 100644
--- a/blocks/cflow/DeadCodeRemover.cs
+++ b/blocks/cflow/DeadCodeRemover.cs
@@ -53,6 +53,16 @@ namespace de4dot.blocks.cflow {
 						allDeadInstructions.Add(i);
 					break;
 
+				case Code.Dup:
+					if (i + 1 >= instructions.Count)
+						break;
+					if (instructions[i + 1].OpCode.Code != Code.Pop)
+						break;
+					allDeadInstructions.Add(i);
+					allDeadInstructions.Add(i + 1);
+					i++;
+					break;
+
 				case Code.Leave:
 				case Code.Leave_S:
 				case Code.Endfinally:
@@ -69,9 +79,11 @@ namespace de4dot.blocks.cflow {
 					break;
 				}
 			}
+			if (allDeadInstructions.Count == 0)
+				return false;
 
 			block.remove(allDeadInstructions);
-			return allDeadInstructions.Count > 0;
+			return true;
 		}
 
 		bool okInstructions(Block block, IEnumerable<int> indexes) {