Conv_A(Unknown_B) -> Unknown_A.

[r16399]

diff --git a/ir/ir/iropt.c b/ir/ir/iropt.c
index 915af89..7a6321f 100644 (file)
--- a/ir/ir/iropt.c
+++ b/ir/ir/iropt.c
@@ -4667,6 +4667,12 @@ static ir_node *transform_node_Conv(ir_node *n) {
                        return c;
                }
        }
+
+       if (is_Unknown(a)) { /* Conv_A(Unknown_B) -> Unknown_A */
+               ir_mode *mode = get_irn_mode(n);
+               return new_r_Unknown(current_ir_graph, mode);
+       }
+
        return n;
 }  /* transform_node_Conv */