Add a testcase where GVNPRE what getting confused by a loop.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37594 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 22 insertions, 0 deletions

diff --git a/test/Transforms/GVNPRE/2007-06-15-Looping.ll b/test/Transforms/GVNPRE/2007-06-15-Looping.ll
new file mode 100644
index 0000000000..92d2288f89
--- /dev/null
+++ b/test/Transforms/GVNPRE/2007-06-15-Looping.ll
@@ -0,0 +1,22 @@
+; RUN: llvm-as < %s | opt -gvnpre | llvm-dis
+
+define fastcc void @compute_max_score_1() {
+entry:
+	%tmp7 = sub i32 0, 0		; <i32> [#uses=0]
+	br label %bb
+
+bb:		; preds = %bb212, %entry
+	%indvar29 = phi i32 [ 0, %entry ], [ %indvar.next30, %bb212 ]		; <i32> [#uses=2]
+	%j.01.0 = sub i32 %indvar29, 0		; <i32> [#uses=0]
+	br label %cond_next166
+
+cond_next166:		; preds = %cond_next166, %bb
+	br i1 false, label %bb212, label %cond_next166
+
+bb212:		; preds = %cond_next166
+	%indvar.next30 = add i32 %indvar29, 1		; <i32> [#uses=1]
+	br i1 false, label %return, label %bb
+
+return:		; preds = %bb212
+	ret void
+}