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authorChris Lattner <sabre@nondot.org>2004-02-24 07:21:09 +0000
committerChris Lattner <sabre@nondot.org>2004-02-24 07:21:09 +0000
commit2189a760241550a4ca44bd4a9150372d77afb84f (patch)
tree87deedddbddf036f9a356e4593658a1c8ddf9fb4 /test/Transforms/SimplifyCFG
parentec8b8bb9abffdcc22373a7f28803c18ed8efa102 (diff)
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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
Diffstat (limited to 'test/Transforms/SimplifyCFG')
-rw-r--r--test/Transforms/SimplifyCFG/switch_switch_fold.ll46
1 files changed, 46 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
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
+}
+