alias-19.c: New testcase.

2008-10-21  Richard Guenther  <rguenther@suse.de>

	* gcc.dg/tree-ssa/alias-19.c: New testcase.

From-SVN: r141261

gcc/testsuite/ChangeLog

+2008-10-21  Richard Guenther  <rguenther@suse.de>
+
+	* gcc.dg/tree-ssa/alias-19.c: New testcase.
+
 2008-10-20  Manuel López-Ibáñez  <manu@gcc.gnu.org>
         
 	PR 12603

gcc/testsuite/gcc.dg/tree-ssa/alias-19.c

+/* { dg-do run } */
+/* { dg-options "-O2 -fdump-tree-alias-vops" } */
+
+const static int a;
+
+int __attribute__((noinline))
+foo(int i)
+{
+  const int *q;
+  int b;
+  if (i)
+    q = &a;
+  else
+    q = &b;
+  b = 1;
+  /* We should not prune a from the points-to set of q.  */
+  return *q;
+}
+
+extern void abort (void);
+int main()
+{
+  if (foo(1) != 0)
+    abort ();
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump "q_. = { a b }" "alias" } } */
+/* { dg-final { scan-tree-dump "q_., name memory tag: NMT..., is dereferenced, points-to vars: { a b }" "alias" } } */
+/* { dg-final { scan-tree-dump "# VUSE <a_.\\\(D\\\), b_.>" "alias" } } */
+/* { dg-final { cleanup-tree-dump "alias" } } */