New testcase that crashes the loop extractor

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12399 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/CodeExtractor/2004-03-14-NoSwitchSupport.ll b/test/Transforms/CodeExtractor/2004-03-14-NoSwitchSupport.ll
new file mode 100644 (file)
index 0000000..7144555
--- /dev/null
+++ b/test/Transforms/CodeExtractor/2004-03-14-NoSwitchSupport.ll
@@ -0,0 +1,27 @@
+; RUN: llvm-as < %s | opt -loop-extract-single -disable-output
+
+void %ab() {
+entry:
+       br label %codeReplTail
+
+then.1:                ; preds = %codeReplTail
+       br label %loopentry.1
+
+loopentry.1:           ; preds = %loopentry.1.preheader, %no_exit.1
+       br bool false, label %no_exit.1, label %loopexit.0.loopexit1
+
+no_exit.1:             ; preds = %loopentry.1
+       br label %loopentry.1
+
+loopexit.0.loopexit:           ; preds = %codeReplTail
+       ret void
+
+loopexit.0.loopexit1:          ; preds = %loopentry.1
+       ret void
+
+codeReplTail:          ; preds = %codeRepl, %codeReplTail
+       switch ushort 0, label %codeReplTail [
+                ushort 0, label %loopexit.0.loopexit
+                ushort 1, label %then.1
+       ]
+}