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diff --git a/test/CodeGen/Thumb/barrier.ll b/test/CodeGen/Thumb/barrier.ll
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+++ b/test/CodeGen/Thumb/barrier.ll
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+; RUN: llc < %s -mtriple=thumbv6-apple-darwin | FileCheck %s -check-prefix=V6
+; RUN: llc < %s -march=thumb -mattr=+v6m | FileCheck %s -check-prefix=V6M
+
+declare void @llvm.memory.barrier( i1 , i1 , i1 , i1 , i1 )
+
+define void @t1() {
+; V6: t1:
+; V6: blx {{_*}}sync_synchronize
+
+; V6M: t1:
+; V6M: dsb
+ call void @llvm.memory.barrier( i1 false, i1 false, i1 false, i1 true, i1 true )
+ ret void
+}
+
+define void @t2() {
+; V6: t2:
+; V6: blx {{_*}}sync_synchronize
+
+; V6M: t2:
+; V6M: dmb
+ call void @llvm.memory.barrier( i1 false, i1 false, i1 false, i1 true, i1 false )
+ ret void
+}