check the opcode again after an optimize_node()

[r16335]

diff --git a/ir/opt/reassoc.c b/ir/opt/reassoc.c
index de5b6dd..d18719a 100644 (file)
--- a/ir/opt/reassoc.c
+++ b/ir/opt/reassoc.c
@@ -688,9 +688,10 @@ transform:
        in[1] = b;
 
        mode = get_mode_from_ops(a, b);
-       in[0] = optimize_node(new_ir_node(dbg, current_ir_graph, blk, op, mode, 2, in));
+       in[0] = irn = optimize_node(new_ir_node(dbg, current_ir_graph, blk, op, mode, 2, in));
 
-       if (op == op_Add || op == op_Sub) {
+       /* beware: optimize_node might have changed the opcode, check again */
+       if (is_Add(irn) || is_Sub(irn)) {
                reverse_rule_distributive(&in[0]);
        }
        in[1] = c;