New testcase to ensure that switch folding happens correctly

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7922 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/SimplifyCFG/2003-08-17-FoldSwitch.ll b/test/Transforms/SimplifyCFG/2003-08-17-FoldSwitch.ll
new file mode 100644 (file)
index 0000000..79b55a4
--- /dev/null
+++ b/test/Transforms/SimplifyCFG/2003-08-17-FoldSwitch.ll
@@ -0,0 +1,49 @@
+; RUN: as < %s | opt -simplifycfg | dis | not grep switch
+
+int %test1() {   ; Test normal folding
+       switch uint 5, label %Default [
+               uint 0, label %Foo
+               uint 1, label %Bar
+               uint 2, label %Baz
+               uint 5, label %TheDest
+       ]
+Default:ret int -1
+Foo:   ret int -2
+Bar:   ret int -3
+Baz:   ret int -4
+TheDest:ret int 1234
+}
+
+int %test2() {   ; Test folding to default dest
+       switch uint 3, label %Default [
+               uint 0, label %Foo
+               uint 1, label %Bar
+               uint 2, label %Baz
+               uint 5, label %TheDest
+       ]
+Default:ret int 1234
+Foo:   ret int -2
+Bar:   ret int -5
+Baz:   ret int -6
+TheDest:ret int -8
+}
+
+int %test3(bool %C) {   ; Test folding all to same dest
+       br bool %C, label %Start, label %TheDest
+Start:
+       switch uint 3, label %TheDest [
+               uint 0, label %TheDest
+               uint 1, label %TheDest
+               uint 2, label %TheDest
+               uint 5, label %TheDest
+       ]
+TheDest: ret int 1234
+}
+
+int %test4(uint %C) {   ; Test folding switch -> branch
+       switch uint %C, label %L1 [
+               uint 0, label %L2
+       ]
+L1:    ret int 0
+L2:    ret int 1
+}