re PR tree-optimization/34140 (ICE in is_hidden_global_store, at tree-ssa-sink.c:207)

	PR tree-optimization/34140
	* tree-if-conv.c (if_convertible_phi_p): Fail if BB other than
	loop->header has virtual phi nodes.

	* gcc.c-torture/compile/20071128-1.c: New test.

From-SVN: r130494

gcc/ChangeLog

+2007-11-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/34140
+	* tree-if-conv.c (if_convertible_phi_p): Fail if BB other than
+	loop->header has virtual phi nodes.
+
 2007-11-28  Richard Sandiford  <rsandifo@nildram.co.uk>
 
 	PR target/32406

gcc/testsuite/ChangeLog

+2007-11-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/34140
+	* gcc.c-torture/compile/20071128-1.c: New test.
+
 2007-11-27  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR fortran/32928

gcc/testsuite/gcc.c-torture/compile/20071128-1.c

+/* PR tree-optimization/34140 */
+/* Testcase by Martin Michlmayr <tbm@cyrius.com> */
+
+struct S
+{
+  unsigned int s;
+};
+struct T
+{
+  struct S t[2];
+  unsigned int u : 1;
+};
+
+void
+foo (int x, int y, int z)
+{
+  int i;
+  struct T t;
+
+  t.u = t.u;
+  for (i = 0; i < x; i++)
+    if (z != 1)
+      t.t[i].s = y || t.u;
+}

gcc/tree-if-conv.c

@@ -302,7 +302,8 @@ tree_if_convert_cond_expr (struct loop *loop, tree stmt, tree cond,
    and it belongs to basic block BB.
    PHI is not if-convertible
    - if it has more than 2 arguments.
-   - Virtual PHI is immediately used in another PHI node.  */
+   - Virtual PHI is immediately used in another PHI node.
+   - Virtual PHI on BB other than header.  */
 
 static bool
 if_convertible_phi_p (struct loop *loop, basic_block bb, tree phi)
@@ -324,6 +325,13 @@ if_convertible_phi_p (struct loop *loop, basic_block bb, tree phi)
     {
       imm_use_iterator imm_iter;
       use_operand_p use_p;
+
+      if (bb != loop->header)
+	{
+	  if (dump_file && (dump_flags & TDF_DETAILS))
+	    fprintf (dump_file, "Virtual phi not on loop header.\n");
+	  return false;
+	}
       FOR_EACH_IMM_USE_FAST (use_p, imm_iter, PHI_RESULT (phi))
 	{
 	  if (TREE_CODE (USE_STMT (use_p)) == PHI_NODE)