1 files changed, 24 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/alias-20.c b/gcc/testsuite/gcc.dg/tree-ssa/alias-20.c
new file mode 100644
index 000000000..7991c52fd
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/alias-20.c
@@ -0,0 +1,24 @@
+/* { dg-do compile } */
+/* { dg-options "-O -fstrict-aliasing -fdump-tree-optimized" } */
+
+struct S { float f; int i; };
+struct R { int x; int i; };
+
+/* Strict-aliasing rules say that int and float do not alias.  */
+int bar(struct S *s, int *i)
+{
+  *i = 0;
+  s->f = 1.0;
+  return *i;
+}
+
+/* Strict-aliasing rules say that S and R do not alias.  */
+int foo(struct S *s, struct R *r)
+{
+  r->i = 0;
+  s->i = 1;
+  return r->i;
+}
+
+/* { dg-final { scan-tree-dump-times "return 0;" 2 "optimized" } } */
+/* { dg-final { cleanup-tree-dump "optimized" } } */