Synchronize with google/gcc-4_9 to r224707 (from r214835)

Change-Id: I3d6f06fc613c8f8b6a82143dc44b7338483aac5d

1 files changed, 47 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/pr62167-run.c b/gcc-4.9/gcc/testsuite/gcc.dg/pr62167-run.c
new file mode 100644
index 000000000..37214a3ec
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.dg/pr62167-run.c
@@ -0,0 +1,47 @@
+/* { dg-do run } */
+/* { dg-options "-O2 -ftree-tail-merge" } */
+
+struct node
+{
+  struct node *next;
+  struct node *prev;
+};
+
+struct node node;
+
+struct head
+{
+  struct node *first;
+};
+
+struct head heads[5];
+
+int k = 2;
+
+struct head *head = &heads[2];
+
+int
+main ()
+{
+  struct node *p;
+
+  node.next = (void*)0;
+
+  node.prev = (void *)head;
+
+  head->first = &node;
+
+  struct node *n = head->first;
+
+  struct head *h = &heads[k];
+
+  heads[2].first = n->next;
+
+  if ((void*)n->prev == (void *)h)
+    p = h->first;
+  else
+    /* Dead tbaa-unsafe load from ((struct node *)&heads[2])->next.  */
+    p = n->prev->next;
+
+  return !(p == (void*)0);
+}