1 files changed, 35 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/vrp03.c b/gcc/testsuite/gcc.dg/tree-ssa/vrp03.c
new file mode 100644
index 000000000..9b7c08256
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/vrp03.c
@@ -0,0 +1,35 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-vrp1" } */
+
+struct A
+{
+  int a;
+  int b;
+};
+
+foo (struct A *p, struct A *q)
+{
+  int *r = 0;
+
+  if (p)
+    {
+      if (p == q)
+	{
+	  /* This should be folded to 'if (1)' because q is [p, p]
+	     and p is ~[0, 0].  */
+	  if (q)
+	    r = &q->a;
+
+	  /* This should be folded to 'if (1)' because q should be
+	     ~[0, 0] and thus &q->a should be ~[0, 0].  */
+	  if (r)
+	    return 5;
+	}
+    }
+
+  return q->a;
+}
+
+/* { dg-final { scan-tree-dump-times "Folding predicate q_.*to 1" 1 "vrp1" } } */
+/* { dg-final { scan-tree-dump-times "Folding predicate r_.*to 1" 1 "vrp1" } } */
+/* { dg-final { cleanup-tree-dump "vrp1" } } */