re PR tree-optimization/22625 (-ftree-vrp produces wrong code)

2005-07-22  Andrew Pinski  <pinskia@physics.uc.edu>

        PR tree-opt/22625
        * g++.dg/opt/vrp2.C: New test.

From-SVN: r102303

gcc/testsuite/ChangeLog

+2005-07-22  Andrew Pinski  <pinskia@physics.uc.edu>
+
+	PR tree-opt/22625
+	* g++.dg/opt/vrp2.C: New test.
+
 2005-07-22  Mark Mitchell  <mark@codesourcery.com>
 
 	PR debug/21828

gcc/testsuite/g++.dg/opt/vrp2.C

+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+/* VRP was miscompiling the following as it thought &a->b was a dereference
+   and therfore a was non-null.  
+   Reduced from Mozilla by Serge Belyshev <belyshev@depni.sinp.msu.ru>.  */
+
+extern "C" void abort (void);
+struct T { int i; } t;
+struct A : T { int j; } q, *p = &q;
+
+int main (void)
+{
+  if (p == &t)
+    return 0;
+  if (p)
+    abort ();
+  return 0;
+}
+