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diff --git a/test/arch/mep/asm/test_major_opcode_9.py b/test/arch/mep/asm/test_major_opcode_9.py
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+# Toshiba MeP-c4 - Major Opcode #9 unit tests
+# Guillaume Valadon <guillaume@valadon.net>
+
+from ut_helpers_asm import check_instruction
+
+
+class TestMajor9:
+
+    def test_ADD3(self):
+        """Test the ADD3 instruction"""
+
+        # Top instructions
+        check_instruction("ADD3 $10, $4, $0", "940a")
+        check_instruction("ADD3 $3, $0, $0", "9003")
+        check_instruction("ADD3 $12, $4, $0", "940c")
+        check_instruction("ADD3 $7, $12, $0", "9c07")
+        check_instruction("ADD3 $TP, $4, $0", "940d")
+
+        # Randomly choosen instructions
+        check_instruction("ADD3 $4, $1, $9", "9194")
+        check_instruction("ADD3 $7, $12, $9", "9c97")
+        check_instruction("ADD3 $12, $9, $SP", "99fc")
+        check_instruction("ADD3 $12, $TP, $7", "9d7c")
+        check_instruction("ADD3 $4, $8, $SP", "98f4")