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

# Opcode=390 Name=SXTBr_rot Format=ARM_FORMAT_EXTFRM(14)
#  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: 0: 1: 0| 1: 1: 1: 1| 1: 1: 1: 1| 0: 1: 0: 0| 0: 1: 1: 1| 0: 1: 0: 1|
# -------------------------------------------------------------------------------------------------
#
# A8.6.223 SXTB
# if d == 15 || m == 15 then UNPREDICTABLE;
0x75 0xf4 0xaf 0xe6