# RUN: llvm-mc --disassemble %s -triple=thumb-apple-darwin9 2>&1 | 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