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+# RUN: llvm-mc --disassemble %s -triple=thumb-apple-darwin9 |& grep {invalid instruction encoding}
+
+# Opcode=1908 Name=t2DMB Format=ARM_FORMAT_THUMBFRM(25)
+# 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
+# -------------------------------------------------------------------------------------------------
+# | 1: 1: 1: 1| 0: 0: 1: 1| 1: 0: 1: 1| 1: 1: 1: 1| 1: 0: 0: 0| 1: 1: 1: 1| 0: 1: 0: 1| 0: 0: 0: 1|
+# -------------------------------------------------------------------------------------------------
+#
+# Inst{3-0} encodes the option: SY, ST, ISH, ISHST, NSH, NSHST, OSH, OSHST.
+# Reject invalid encodings.
+#
+# See also A8.6.42 DSB
+# All other encodings of option are reserved. It is IMPLEMENTATION DEFINED whether options
+# other than SY are implemented. All unsupported and reserved options must execute as a full
+# system DSB operation, but software must not rely on this behavior.
+0xbf 0xf3 0x51 0x8f