diff --git a/src/backend/ir/node.cpp b/src/backend/ir/node.cpp
index f1cd38ae..ac017122 100644
--- a/src/backend/ir/node.cpp
+++ b/src/backend/ir/node.cpp
@@ -53,8 +53,8 @@ namespace rat {
 	}
 
 	void Node::removeUser(Node* user) {
-		// remove a single occurrence: each using operand contributes one entry
-		for(U32 i = 0; i < userCount; ++i)
+		// remove a single occurrence: each using operand contributes one entry;
+		for(U32 i = userCount; i-- > 0;)
 			if(users[i] == user) {
 				users[i] = users[--userCount];
 				return;
diff --git a/src/backend/pass/opt/gvn.h b/src/backend/pass/opt/gvn.h
index 6ad69a6a..eb8dcd71 100644
--- a/src/backend/pass/opt/gvn.h
+++ b/src/backend/pass/opt/gvn.h
@@ -38,7 +38,7 @@ namespace rat {
 				hashMix(h, k.type);
 				hashMix(h, (U64)k.payload);
 				hashMix(h, k.in0);
-				hashMix(h, ((U64)k.in1) << 32);
+				hashMix(h, k.in1);
 				if(k.sym)
 					hashMix(h, std::hash<String>{}(*k.sym));
 				return (U64)h;