1 files changed, 47 insertions, 0 deletions
diff --git a/test/Transforms/SimplifyCFG/switch_switch_fold.ll b/test/Transforms/SimplifyCFG/switch_switch_fold.ll
new file mode 100644
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--- /dev/null
+++ b/test/Transforms/SimplifyCFG/switch_switch_fold.ll
@@ -0,0 +1,47 @@
+; RUN: llvm-upgrade < %s | llvm-as | opt -simplifycfg | llvm-dis | \
+; RUN:   grep switch | wc -l | grep 1
+
+; Test that a switch going to a switch on the same value can be merged.   All 
+; three switches in this example can be merged into one big one.
+
+declare void %foo1()
+declare void %foo2()
+declare void %foo3()
+declare void %foo4()
+
+void %test1(uint %V) {
+        switch uint %V, label %F [
+                 uint 4, label %T
+                 uint 17, label %T
+                 uint 5, label %T
+                 uint 1234, label %F
+        ]
+
+T:
+        switch uint %V, label %F [
+                 uint 4, label %A
+                 uint 17, label %B
+		 uint 42, label %C
+        ]
+A:
+        call void %foo1()
+        ret void
+
+B:
+        call void %foo2()
+        ret void
+C:
+	call void %foo3()
+	ret void
+
+F:
+        switch uint %V, label %F [
+                 uint 4, label %B
+                 uint 18, label %B
+		 uint 42, label %D
+        ]
+D:
+        call void %foo4()
+        ret void
+}
+