From 9428050dd62a51eda1595f1045a7b6ebe84101fb Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Thu, 6 Feb 2014 19:35:33 +0100
Subject: [PATCH] Added i:, o:, and x: selection pattern

---
 passes/cmds/select.cc | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/passes/cmds/select.cc b/passes/cmds/select.cc
index 99f9d31e1..ed3e4d726 100644
--- a/passes/cmds/select.cc
+++ b/passes/cmds/select.cc
@@ -657,6 +657,21 @@ static void select_stmt(RTLIL::Design *design, std::string arg)
 				if (match_ids(it.first, arg_memb.substr(2)))
 					sel.selected_members[mod->name].insert(it.first);
 		} else
+		if (arg_memb.substr(0, 2) == "i:") {
+			for (auto &it : mod->wires)
+				if (it.second->port_input && match_ids(it.first, arg_memb.substr(2)))
+					sel.selected_members[mod->name].insert(it.first);
+		} else
+		if (arg_memb.substr(0, 2) == "o:") {
+			for (auto &it : mod->wires)
+				if (it.second->port_output && match_ids(it.first, arg_memb.substr(2)))
+					sel.selected_members[mod->name].insert(it.first);
+		} else
+		if (arg_memb.substr(0, 2) == "x:") {
+			for (auto &it : mod->wires)
+				if ((it.second->port_input || it.second->port_output) && match_ids(it.first, arg_memb.substr(2)))
+					sel.selected_members[mod->name].insert(it.first);
+		} else
 		if (arg_memb.substr(0, 2) == "m:") {
 			for (auto &it : mod->memories)
 				if (match_ids(it.first, arg_memb.substr(2)))
@@ -836,6 +851,9 @@ struct SelectPass : public Pass {
 		log("    w:<pattern>\n");
 		log("        all wires with a name matching the given wildcard pattern\n");
 		log("\n");
+		log("    i:<pattern>, o:<pattern>, x:<pattern>\n");
+		log("        select input (i:), output (o:) or any ports (x:) with matching names\n");
+		log("\n");
 		log("    m:<pattern>\n");
 		log("        all memories with a name matching the given pattern\n");
 		log("\n");