From 6777f7a57fed6b39128773f13084da729dd64588 Mon Sep 17 00:00:00 2001
From: chriseth <chris@ethereum.org>
Date: Thu, 8 Mar 2018 19:41:29 +0100
Subject: Optimize across MLOAD if MSIZE is not used.

---
 libevmasm/Assembly.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'libevmasm/Assembly.cpp')

diff --git a/libevmasm/Assembly.cpp b/libevmasm/Assembly.cpp
index bd4ebf59..b71bc80c 100644
--- a/libevmasm/Assembly.cpp
+++ b/libevmasm/Assembly.cpp
@@ -438,13 +438,15 @@ map<u256, u256> Assembly::optimiseInternal(
 			// function types that can be stored in storage.
 			AssemblyItems optimisedItems;
 
+			bool usesMSize = (find(m_items.begin(), m_items.end(), AssemblyItem(Instruction::MSIZE)) != m_items.end());
+
 			auto iter = m_items.begin();
 			while (iter != m_items.end())
 			{
 				KnownState emptyState;
 				CommonSubexpressionEliminator eliminator(emptyState);
 				auto orig = iter;
-				iter = eliminator.feedItems(iter, m_items.end());
+				iter = eliminator.feedItems(iter, m_items.end(), usesMSize);
 				bool shouldReplace = false;
 				AssemblyItems optimisedChunk;
 				try
-- 
cgit