+; RUN: opt < %s -simplifycfg -S | FileCheck %s
+
+; This test checks that the SimplifyCFG pass won't duplicate a call to a
+; function marked noduplicate.
+;
+; CHECK-LABEL: @noduplicate
+; CHECK: call void @barrier
+; CHECK-NOT: call void @barrier
+define void @noduplicate(i32 %cond, i32* %out) {
+entry:
+ %out1 = getelementptr i32* %out, i32 1
+ %out2 = getelementptr i32* %out, i32 2
+ %cmp = icmp eq i32 %cond, 0
+ br i1 %cmp, label %if.then, label %if.end
+
+if.then:
+ store i32 5, i32* %out
+ br label %if.end
+
+if.end:
+ call void @barrier() #0
+ br i1 %cmp, label %cond.end, label %cond.false
+
+cond.false:
+ store i32 5, i32* %out1
+ br label %cond.end
+
+cond.end:
+ %value = phi i32 [ 1, %cond.false ], [ 0, %if.end ]
+ store i32 %value, i32* %out2
+ ret void
+}
+
+; Function Attrs: noduplicate nounwind
+declare void @barrier() #0
+
+attributes #0 = { noduplicate nounwind }