1 files changed, 40 insertions, 0 deletions
diff --git a/common/design_utils.cc b/common/design_utils.cc
new file mode 100644
index 00000000..a7298aec
--- /dev/null
+++ b/common/design_utils.cc
@@ -0,0 +1,40 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2018  Clifford Wolf <clifford@clifford.at>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "design_utils.h"
+
+void replace_port(CellInfo *old_cell, PortInfo *old, CellInfo *rep_cell,
+                  PortInfo *rep)
+{
+    assert(old->type == rep->type);
+
+    rep->net = old->net;
+    old->net = nullptr;
+    if (rep->type == PORT_OUT) {
+        rep->net->driver.cell = rep_cell;
+        rep->net->driver.port = rep->name;
+    } else if (rep->type == PORT_IN) {
+        for (PortRef &load : rep->net->users) {
+            if (load.cell == old_cell && load.port == old->name) {
+                load.cell = rep_cell;
+                load.port = rep->name;
+            }
+        }
+    }
+}