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

diff --git a/test/Transforms/GVNPRE/2007-06-15-Looping.ll b/test/Transforms/GVNPRE/2007-06-15-Looping.ll
new file mode 100644 (file)
index 0000000..92d2288
--- /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
+}