From 2189a760241550a4ca44bd4a9150372d77afb84f Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 24 Feb 2004 07:21:09 +0000
Subject: New testcase.  Switch instructions that go to switch instructions
 should be merged.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11796 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/SimplifyCFG/switch_switch_fold.ll | 46 +++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 test/Transforms/SimplifyCFG/switch_switch_fold.ll

(limited to 'test')

diff --git a/test/Transforms/SimplifyCFG/switch_switch_fold.ll b/test/Transforms/SimplifyCFG/switch_switch_fold.ll
new file mode 100644
index 0000000..cafd7d7
--- /dev/null
+++ b/test/Transforms/SimplifyCFG/switch_switch_fold.ll
@@ -0,0 +1,46 @@
+; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | 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
+}
+
-- 
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