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diff --git a/test/MC/ARM/udf-thumb-2-diagnostics.s b/test/MC/ARM/udf-thumb-2-diagnostics.s
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+++ b/test/MC/ARM/udf-thumb-2-diagnostics.s
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+@ RUN: not llvm-mc -triple thumbv7-eabi -mattr +thumb2 %s 2>&1 | FileCheck %s
+
+ .syntax unified
+ .text
+ .thumb
+
+undefined:
+ udfpl
+
+@ CHECK: error: instruction 'udf' is not predicable, but condition code specified
+@ CHECK: udfpl
+@ CHECK: ^
+
+ udf #256
+
+@ CHECK: error: instruction requires: arm-mode
+@ CHECK: udf #256
+@ CHECK: ^
+
+ udf.w #65536
+
+@ CHECK: error: invalid operand for instruction
+@ CHECK: udf.w #65536
+@ CHECK: ^
+