diff --git a/src/Transformations/MoveOperators/move_operators.cpp b/src/Transformations/MoveOperators/move_operators.cpp
index 686cbd3..be51ce1 100644
--- a/src/Transformations/MoveOperators/move_operators.cpp
+++ b/src/Transformations/MoveOperators/move_operators.cpp
@@ -1,7 +1,6 @@
 #include <map>
 #include <set>
 #include <vector>
-#include <iostream>
 #include <algorithm>
 #include <cstring>
 #include <cstdlib>
@@ -192,6 +191,94 @@ static map<SgStatement*, set<SgStatement*>> analyzeBasicBlockIntraDependencies(c
         return normalizeSageString(raw ? string(raw) : string());
     };
 
+    function<string(SgExpression*)> canonicalExprKey;
+    canonicalExprKey = [&](SgExpression* expr) -> string
+    {
+        if (!expr)
+            return string();
+
+        const int v = expr->variant();
+
+        if (v == ADD_OP)
+        {
+            vector<string> terms;
+            function<void(SgExpression*)> flattenAdd = [&](SgExpression* e)
+            {
+                if (!e)
+                    return;
+                if (e->variant() == ADD_OP)
+                {
+                    flattenAdd(e->lhs());
+                    flattenAdd(e->rhs());
+                }
+                else
+                    terms.push_back(canonicalExprKey(e));
+            };
+            flattenAdd(expr);
+            sort(terms.begin(), terms.end());
+            string joined;
+            for (size_t i = 0; i < terms.size(); ++i)
+            {
+                if (i)
+                    joined += " + ";
+                joined += terms[i];
+            }
+            return joined;
+        }
+
+        if (v == MULT_OP)
+        {
+            vector<string> factors;
+            function<void(SgExpression*)> flattenMult = [&](SgExpression* e)
+            {
+                if (!e)
+                    return;
+                if (e->variant() == MULT_OP)
+                {
+                    flattenMult(e->lhs());
+                    flattenMult(e->rhs());
+                }
+                else
+                    factors.push_back(canonicalExprKey(e));
+            };
+            flattenMult(expr);
+            sort(factors.begin(), factors.end());
+            string joined;
+            for (size_t i = 0; i < factors.size(); ++i)
+            {
+                if (i)
+                    joined += " * ";
+                joined += factors[i];
+            }
+            return joined;
+        }
+
+        SgExpression *l = expr->lhs();
+        SgExpression *r = expr->rhs();
+
+        if (l && r)
+        {
+            if (v == SUBT_OP || v == SUB_OP)
+                return canonicalExprKey(l) + string(" - ") + canonicalExprKey(r);
+            if (v == DIV_OP || v == INTEGER_DIV_OP)
+                return canonicalExprKey(l) + string(" / ") + canonicalExprKey(r);
+            if (v == EXP_OP)
+                return canonicalExprKey(l) + string(" ** ") + canonicalExprKey(r);
+        }
+
+        if (l && !r)
+        {
+            if (v == MINUS_OP)
+                return string("-") + canonicalExprKey(l);
+            if (v == UNARY_ADD_OP)
+                return canonicalExprKey(l);
+            if (v == CAST_OP)
+                return canonicalExprKey(l);
+        }
+
+        return sageExprToString(expr);
+    };
+
     auto arrayElementKey = [&](SgArrayRefExp* arrayRef) -> string
     {
         if (!arrayRef)
@@ -212,7 +299,7 @@ static map<SgStatement*, set<SgStatement*>> analyzeBasicBlockIntraDependencies(c
         {
             if (i)
                 key += ", ";
-            key += sageExprToString(arrayRef->subscript(i));
+            key += canonicalExprKey(arrayRef->subscript(i));
         }
         key += ")";