1 files changed, 65 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr34244.c b/gcc/testsuite/gcc.dg/tree-ssa/pr34244.c
new file mode 100644
index 000000000..262c92f1f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr34244.c
@@ -0,0 +1,65 @@
+/* PR tree-optimization/34244  */
+/* { dg-do run } */
+/* { dg-options "-O2 " } */
+
+int __attribute__((noinline)) GetParent(void)
+{
+  static int count = 0;
+  count++;
+  switch (count)
+    {
+    case 1:
+    case 3:
+    case 4:
+        return 1;
+    default:
+        return 0;
+    }
+}
+int __attribute__((noinline)) FindCommonAncestor(int aNode1, int aNode2)
+{
+  if (aNode1 && aNode2) {
+    int offset = 0;
+    int anc1 = aNode1;
+    for (;;) {
+      ++offset;
+      int  parent = GetParent();
+      if (!parent)
+        break;
+      anc1 = parent;
+    }
+    int anc2 = aNode2;
+    for (;;) {
+      --offset;
+      int  parent = GetParent();
+      if (!parent)
+        break;
+      anc2 = parent;
+    }
+    if (anc1 == anc2) {
+      anc1 = aNode1;
+      anc2 = aNode2;
+      while (offset > 0) {
+        anc1 = GetParent();
+        --offset;
+      }
+      while (offset < 0) {
+        anc2 = GetParent();
+        ++offset;
+      }
+      while (anc1 != anc2) {
+        anc1 = GetParent();
+        anc2 = GetParent();
+      } 
+      return anc1;
+    }
+  }
+  return 0;
+}
+extern void abort (void);
+int main()
+{
+  if (FindCommonAncestor (1, 1) != 0)
+    abort ();
+  return 0;
+}