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# RUN: llvm-mc --disassemble %s -triple=arm-apple-darwin9 2>&1 | grep "potentially undefined instruction encoding"

# Opcode=140 Name=LDRB_POST Format=ARM_FORMAT_LDFRM(6)
#  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: 0| 0: 1: 1: 0| 1: 1: 0: 1| 0: 1: 1: 1| 0: 1: 1: 1| 0: 0: 0: 0| 0: 0: 0: 0| 0: 1: 0: 1|
# -------------------------------------------------------------------------------------------------
#
# if wback && (n == 15 || n == t) then UNPREDICTABLE
0x05 0x70 0xd7 0xe6