From 6f9a6fd783dcca871ab89890aa9cde7add648f1e Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Tue, 1 Sep 2015 13:10:36 +0200
Subject: Fixed port ordering in "splitnets" cmd

---
 passes/cmds/splitnets.cc | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/passes/cmds/splitnets.cc b/passes/cmds/splitnets.cc
index 3cd857f4..3b6ad014 100644
--- a/passes/cmds/splitnets.cc
+++ b/passes/cmds/splitnets.cc
@@ -50,7 +50,7 @@ struct SplitnetsWorker
 			new_wire_name += format.substr(1, 1);
 
 		RTLIL::Wire *new_wire = module->addWire(module->uniquify(new_wire_name), width);
-		new_wire->port_id = wire->port_id;
+		new_wire->port_id = wire->port_id ? wire->port_id + offset : 0;
 		new_wire->port_input = wire->port_input;
 		new_wire->port_output = wire->port_output;
 
@@ -130,14 +130,24 @@ struct SplitnetsPass : public Pass {
 		}
 		extra_args(args, argidx, design);
 
-		for (auto &mod_it : design->modules_)
+		for (auto module : design->selected_modules())
 		{
-			RTLIL::Module *module = mod_it.second;
-			if (!design->selected(module))
-				continue;
-
 			SplitnetsWorker worker;
 
+			if (flag_ports)
+			{
+				int normalized_port_factor = 0;
+
+				for (auto wire : module->wires())
+					if (wire->port_id != 0) {
+						normalized_port_factor = std::max(normalized_port_factor, wire->port_id+1);
+						normalized_port_factor = std::max(normalized_port_factor, GetSize(wire)+1);
+					}
+
+				for (auto wire : module->wires())
+					wire->port_id *= normalized_port_factor;
+			}
+
 			if (flag_driver)
 			{
 				CellTypes ct(design);
@@ -194,7 +204,8 @@ struct SplitnetsPass : public Pass {
 				delete_wires.insert(it.first);
 			module->remove(delete_wires);
 
-			module->fixup_ports();
+			if (flag_ports)
+				module->fixup_ports();
 		}
 	}
 } SplitnetsPass;
-- 
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