opt_dff: Fix behavior on $ff with D == Q.

diff --git a/passes/opt/opt_dff.cc b/passes/opt/opt_dff.cc
index 73d674c8d420c21803679ce5605a02e76a77bd5d..0ad4acec2167447f2c5843d29c529a1f2e4ef586 100644 (file)
--- a/passes/opt/opt_dff.cc
+++ b/passes/opt/opt_dff.cc
@@ -554,7 +554,7 @@ struct OptDffWorker
                                        // The D input path is effectively useless, so remove it (this will be a const-input D latch, SR latch, or a const driver).
                                        log("Handling D = Q on %s (%s) from module %s (removing D path).\n",
                                                        log_id(cell), log_id(cell->type), log_id(module));
-                                       ff.has_clk = ff.has_ce = false;
+                                       ff.has_gclk = ff.has_clk = ff.has_ce = false;
                                        changed = true;
                                }
                        }