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diff --git a/test/MC/Disassembler/ARM/invalid-t2LDRBT-thumb.txt b/test/MC/Disassembler/ARM/invalid-t2LDRBT-thumb.txt
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+++ b/test/MC/Disassembler/ARM/invalid-t2LDRBT-thumb.txt
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+# RUN: llvm-mc --disassemble %s -triple=thumb-apple-darwin9 |& grep {invalid instruction encoding}
+
+# Opcode=1922 Name=t2LDRBT 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| 1: 0: 0: 0| 0: 0: 0: 1| 0: 0: 0: 0| 1: 1: 1: 1| 1: 1: 1: 0| 0: 0: 0: 0| 0: 0: 1: 1|
+# -------------------------------------------------------------------------------------------------
+#
+# The unpriviledged Load/Store cannot have SP or PC as Rt.
+0x10 0xf8 0x3 0xfe