re PR tree-optimization/42773 (ICE with g++ from 4.4.3 20100112 (prerelease))

2010-01-17  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/42773
	* tree-ssa-pre.c (phi_translate_set): Fix check for PHI node existence.
	(compute_antic_aux): Likewise.
	(compute_partial_antic_aux): Likewise.

	* g++.dg/torture/pr42773.C: New testcase.

From-SVN: r155982

gcc/ChangeLog

+2010-01-17  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/42773
+	* tree-ssa-pre.c (phi_translate_set): Fix check for PHI node existence.
+	(compute_antic_aux): Likewise.
+	(compute_partial_antic_aux): Likewise.
+
 2010-01-17  Jie Zhang  <jie.zhang@analog.com>
 
 	PR debug/42767

gcc/testsuite/ChangeLog

+2010-01-17  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/42773
+	* g++.dg/torture/pr42773.C: New testcase.
+
 2010-01-17  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/42677

gcc/testsuite/g++.dg/torture/pr42773.C

+// { dg-do compile }
+// { dg-options "-fno-exceptions" }
+
+typedef unsigned int uint;
+struct QShared {
+    bool deref() {
+	return !--count;
+    }
+    uint count;
+};
+template <class T> class QValueListNode {
+public:
+    QValueListNode<T>* next;
+    QValueListNode<T>* prev;
+};
+template <class T> class QValueListPrivate : public QShared {
+public:
+    typedef QValueListNode<T> Node;
+    typedef QValueListNode<T>* NodePtr;
+    QValueListPrivate();
+    void derefAndDelete()     {
+	if ( deref() )      delete this;
+    }
+    ~QValueListPrivate();
+    NodePtr node;
+};
+template <class T>  QValueListPrivate<T>::QValueListPrivate() {
+    node = new Node;
+    node->next = node->prev = node;
+}
+template <class T>  QValueListPrivate<T>::~QValueListPrivate() {
+    NodePtr p = node->next;
+    while( p != node ) {
+	NodePtr x = p->next;
+	delete p;
+	p = x;
+    }
+}
+template <class T> class QValueList {
+public:
+    QValueList() {
+	sh = new QValueListPrivate<T>;
+    }
+    ~QValueList() {
+	sh->derefAndDelete();
+    }
+    QValueListPrivate<T>* sh;
+};
+class Cell {
+    QValueList<Cell*> obscuringCells() const;
+};
+QValueList<Cell*> Cell::obscuringCells() const {
+    QValueList<Cell*> empty;
+}

gcc/tree-ssa-pre.c

@@ -1823,7 +1823,7 @@ phi_translate_set (bitmap_set_t dest, bitmap_set_t set, basic_block pred,
   pre_expr expr;
   int i;
 
-  if (!phi_nodes (phiblock))
+  if (gimple_seq_empty_p (phi_nodes (phiblock)))
     {
       bitmap_set_copy (dest, set);
       return;
@@ -2269,14 +2269,14 @@ compute_antic_aux (basic_block block, bool block_has_abnormal_pred_edge)
 	  goto maybe_dump_sets;
 	}
 
-      if (phi_nodes (first))
+      if (!gimple_seq_empty_p (phi_nodes (first)))
 	phi_translate_set (ANTIC_OUT, ANTIC_IN (first), block, first);
       else
 	bitmap_set_copy (ANTIC_OUT, ANTIC_IN (first));
 
       for (i = 0; VEC_iterate (basic_block, worklist, i, bprime); i++)
 	{
-	  if (phi_nodes (bprime))
+	  if (!gimple_seq_empty_p (phi_nodes (bprime)))
 	    {
 	      bitmap_set_t tmp = bitmap_set_new ();
 	      phi_translate_set (tmp, ANTIC_IN (bprime), block, bprime);
@@ -2426,7 +2426,7 @@ compute_partial_antic_aux (basic_block block,
 	      FOR_EACH_EXPR_ID_IN_SET (ANTIC_IN (bprime), i, bi)
 		bitmap_value_insert_into_set (PA_OUT,
 					      expression_for_id (i));
-	      if (phi_nodes (bprime))
+	      if (!gimple_seq_empty_p (phi_nodes (bprime)))
 		{
 		  bitmap_set_t pa_in = bitmap_set_new ();
 		  phi_translate_set (pa_in, PA_IN (bprime), block, bprime);