--- /dev/null
+; REQUIRES: asserts
+; RUN: opt -regions -analyze < %s | FileCheck %s
+; RUN: opt < %s -passes='print<regions>' 2>&1 | FileCheck %s
+
+; While working on improvements to region info analysis, this test
+; case caused an incorrect region bb2 => bb3 to be detected.
+
+define internal i8 @main_read() nounwind {
+bb:
+ br label %bb1
+
+bb1:
+ br i1 true, label %bb2, label %bb7
+
+bb2:
+ br i1 true, label %bb4, label %bb3
+
+bb3:
+ br i1 true, label %bb4, label %bb8
+
+bb4:
+ br label %bb5
+
+bb5:
+ br label %bb6
+
+bb6:
+ br label %bb1
+
+bb7:
+ br label %bb5
+
+bb8:
+ ret i8 1
+}
+
+; CHECK: [0] bb => <Function Return>
+; CHECK-NEXT: [1] bb1 => bb8
+; CHECK-NEXT: End Region tree