Fix for PR 2323, infinite loop in tail dup.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51063 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 26 insertions, 0 deletions

diff --git a/test/Transforms/TailDup/2008-05-13-InfiniteLoop.ll b/test/Transforms/TailDup/2008-05-13-InfiniteLoop.ll
new file mode 100644
index 0000000000..a67e8cdd0c
--- /dev/null
+++ b/test/Transforms/TailDup/2008-05-13-InfiniteLoop.ll
@@ -0,0 +1,26 @@
+; RUN: llvm-as < %s | opt -tailduplicate | llc
+; PR2323
+
+define i32 @func_27(i32 %p_28) nounwind  {
+entry:
+  %tmp125 = trunc i32 %p_28 to i8   ; <i8> [#uses=1]
+  %tmp5.i = icmp eq i8 %tmp125, 0   ; <i1> [#uses=1]
+  br i1 %tmp5.i, label %bb8.i, label %bb.i
+
+bb.i:   ; preds = %entry
+  br label %bb39.i
+
+bb8.i:    ; preds = %entry
+  br label %bb11.i
+
+bb11.i:   ; preds = %bb39.i, %bb8.i
+  %tmp126 = trunc i32 %p_28 to i8   ; <i8> [#uses=1]
+  br label %bb39.i
+
+bb39.i:   ; preds = %bb11.i, %bb.i
+  %tmp127 = trunc i32 %p_28 to i8   ; <i8> [#uses=1]
+  br label %bb11.i
+
+func_29.exit:   ; No predecessors!
+  ret i32 undef
+}