1 files changed, 1 insertions, 1 deletions
diff --git a/backend/CSE3.v b/backend/CSE3.v
index 161a394a..d0dc3aef 100644
--- a/backend/CSE3.v
+++ b/backend/CSE3.v
@@ -46,7 +46,7 @@ Definition transf_instr (fmap : PMap.t RB.t)
   match instr with
   | Iop op args dst s =>
     let args' := subst_args fmap pc args in
-    match find_op_in_fmap fmap pc op args' with
+    match (if is_trivial_op op then None else find_op_in_fmap fmap pc op args') with
     | None => Iop op args' dst s
     | Some src => Iop Omove (src::nil) dst s
     end