diff --git a/test/CodeGen/Blackfin/2009-08-15-LiveIn-SubReg.ll b/test/CodeGen/Blackfin/2009-08-15-LiveIn-SubReg.ll
new file mode 100644
index 00000000000..3cf00cfd9bc
--- /dev/null
+++ b/test/CodeGen/Blackfin/2009-08-15-LiveIn-SubReg.ll
@@ -0,0 +1,20 @@
+; RUN: llvm-as < %s | llc -march=bfin -verify-machineinstrs
+; XFAIL: *
+
+; When joining live intervals of sub-registers, an MBB live-in list is not
+; updated properly. The register scavenger asserts on an undefined register.
+
+define i32 @foo(i8 %bar) {
+entry:
+  switch i8 %bar, label %bb1203 [
+    i8 117, label %bb1204
+    i8 85, label %bb1204
+    i8 106, label %bb1204
+  ]
+
+bb1203:                                           ; preds = %entry
+  ret i32 1
+
+bb1204:                                           ; preds = %entry, %entry, %entry
+  ret i32 2
+}