re PR c++/36960 (Reference variable in virtually inherited base corrupted under optimization)

2010-07-13  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/36960
	* g++.dg/torture/pr36960.C: New testcase.

From-SVN: r162141

gcc/testsuite/ChangeLog

+2010-07-13  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/36960
+	* g++.dg/torture/pr36960.C: New testcase.
+
 2010-07-13  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/44908

gcc/testsuite/g++.dg/torture/pr36960.C

+// { dg-do run }
+
+struct Lower {
+    const int& ref;
+    Lower(const int& ref) : ref(ref) { }
+};
+struct Middle : public virtual Lower {
+    Middle(const int& ref) : Lower(ref) { }
+};
+struct Upper : public Middle {
+    Upper(const int& ref) : Lower(ref), Middle(ref) { }
+    int get() { return ref; }
+};
+extern "C" void abort (void);
+int main()
+{
+  int i = 0;
+  Upper upper(i);
+  if (upper.get() != 0)
+    abort ();
+  return 0;
+}