1 files changed, 29 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-21.c b/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-21.c
new file mode 100644
index 000000000..3f4adf434
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-21.c
@@ -0,0 +1,29 @@
+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-ccp1" } */
+
+struct A {
+    struct B {
+	int i;
+    } b;
+} a;
+
+int foo (void)
+{
+  struct B *p = &a.b;
+  struct A *q = (struct A *) p;
+  return q->b.i;
+}
+
+int bar (void)
+{
+  struct A *p = &a;
+  struct B *q = (struct B *) p;
+  return q->i;
+}
+
+/* The first access is through struct A, so a.b.i is fine,
+   the second access needs to preserve the original access type struct B.  */
+
+/* { dg-final { scan-tree-dump-times "a.b.i" 1 "ccp1" } } */
+/* { dg-final { scan-tree-dump-times "MEM\\\[\\\(struct B \\\*\\\)&a\\\].i" 1 "ccp1" } } */
+/* { dg-final { cleanup-tree-dump "ccp1" } } */