diff --git a/llvm/lib/Transforms/Utils/FunctionComparator.cpp b/llvm/lib/Transforms/Utils/FunctionComparator.cpp
--- a/llvm/lib/Transforms/Utils/FunctionComparator.cpp
+++ b/llvm/lib/Transforms/Utils/FunctionComparator.cpp
@@ -677,7 +677,23 @@
         return Res;
     }
   }
-  return 0;
+
+  if (isa<BinaryOperator>(L)) {
+    // Binary operation instructions and logical operation instructions have
+    // already been compared for opcode, number of operands, operation types,
+    // subclass optional data, operand types
+    return 0;
+  }
+  if (isa<InsertElementInst>(L) || isa<ExtractElementInst>(L)) {
+    // InsertElement and ExtractElement instructions have already been compared
+    // for opcode, number of operands, operation types, subclass optional data,
+    // operand types
+    return 0;
+  }
+
+  // Return left operation to be greater in case of instructions which are
+  // not seen.
+  return 1;
 }
 
 // Determine whether two GEP operations perform the same underlying arithmetic.