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

1 files changed, 49 insertions, 0 deletions

diff --git a/test/Transforms/SimplifyCFG/2003-08-17-FoldSwitch.ll b/test/Transforms/SimplifyCFG/2003-08-17-FoldSwitch.ll
new file mode 100644
index 0000000000..79b55a4c61
--- /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
+}