An ir_node may be even smaller than a struct ir_node, so make right copy

to shut up valgrind (and prevend possible segfaults)

[r3206]

diff --git a/ir/ir/iropt.c b/ir/ir/iropt.c
index ce0e569..a606677 100644 (file)
--- a/ir/ir/iropt.c
+++ b/ir/ir/iropt.c
@@ -1568,8 +1568,12 @@ optimize_node (ir_node *n)
         * we MUST copy the node here temparary, because it's still needed
         * for DBG_OPT_ALGSIM0
         */
-       ir_node x = *n;
-       oldn = &x;
+       int node_size = offsetof(ir_node, attr) +  n->op->attr_size;
+       ir_node *x = alloca(node_size);
+
+       memcpy(x, n, node_size);
+       oldn = x;
+
         /* evaluation was successful -- replace the node. */
        obstack_free (current_ir_graph->obst, n);
        n = new_Const (get_tarval_mode (tv), tv);