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diff --git a/test/MC/ARM/thumb2-bxj-v8.s b/test/MC/ARM/thumb2-bxj-v8.s
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+@ RUN: not llvm-mc -triple=thumbv6t2--none-eabi -show-encoding < %s 2>&1 | FileCheck %s --check-prefix=UNDEF
+@ RUN: not llvm-mc -triple=thumbv7a--none-eabi -show-encoding < %s 2>&1 | FileCheck %s --check-prefix=UNDEF
+@ RUN: not llvm-mc -triple=thumbv7r--none-eabi -show-encoding < %s 2>&1 | FileCheck %s --check-prefix=UNDEF
+@ RUN: not llvm-mc -triple=thumbv7m--none-eabi -show-encoding < %s 2>&1 | FileCheck %s --check-prefix=ARM_MODE
+@ RUN: llvm-mc -triple=thumbv8a--none-eabi -show-encoding < %s 2>&1 | FileCheck %s
+
+bxj r13
+
+@ CHECK: bxj sp @ encoding: [0xcd,0xf3,0x00,0x8f]
+@ UNDEF: error: r13 (SP) is an unpredictable operand to BXJ
+@ ARM_MODE: error: instruction requires: arm-mode