re PR lto/41058 (FAIL: ext/pb_ds/regression/hash_data_map_rand.cc)

2009-08-28  Richard Guenther  <rguenther@suse.de>

	PR lto/41058
	* cp-gimplify.c (cp_genericize_r): Do not leak zero-sized stores
	into the generic IL.

From-SVN: r151176

gcc/cp/ChangeLog

+2009-08-28  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/41058
+	* cp-gimplify.c (cp_genericize_r): Do not leak zero-sized stores
+	into the generic IL.
+
 2009-08-27  Richard Guenther  <rguenther@suse.de>
 
 	* class.c (build_vtbl_ref_1): Remove excess vertical space.

gcc/cp/cp-gimplify.c

@@ -853,6 +853,15 @@ cp_genericize_r (tree *stmt_p, int *walk_subtrees, void *data)
       *walk_subtrees = 0;
     }
 
+  else if (TREE_CODE (stmt) == MODIFY_EXPR
+	   && (integer_zerop (cp_expr_size (TREE_OPERAND (stmt, 0)))
+	       || integer_zerop (cp_expr_size (TREE_OPERAND (stmt, 1)))))
+    {
+      *stmt_p = build2 (COMPOUND_EXPR, TREE_TYPE (stmt),
+			TREE_OPERAND (stmt, 0),
+			TREE_OPERAND (stmt, 1));
+    }
+
   pointer_set_insert (p_set, *stmt_p);
 
   return NULL;