From 56c52cf6c4b369e9fd05759e9b16ea37ff6e332c Mon Sep 17 00:00:00 2001
From: shen203 <52721142+shen203@users.noreply.github.com>
Date: Tue, 30 Jul 2019 15:48:32 -0400
Subject: changing x-bar algorithm to islip

---
 src/gpgpu-sim/local_interconnect.cc | 58 +++++++++++++++++++++++++++++++++++--
 src/gpgpu-sim/local_interconnect.h  |  3 +-
 2 files changed, 58 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/gpgpu-sim/local_interconnect.cc b/src/gpgpu-sim/local_interconnect.cc
index 66d6648..1416b2c 100644
--- a/src/gpgpu-sim/local_interconnect.cc
+++ b/src/gpgpu-sim/local_interconnect.cc
@@ -45,7 +45,8 @@ xbar_router::xbar_router(unsigned router_id, enum Interconnect_type m_type, unsi
 	total_nodes = n_shader+n_mem;
 	in_buffers.resize(total_nodes);
 	out_buffers.resize(total_nodes);
-	next_node=0;
+	next_node.resize(total_nodes,0);
+//	next_node = 0;
 	in_buffer_limit = m_in_buffer_limit;
 	out_buffer_limit = m_out_buffer_limit;
 	if(m_type == REQ_NET) {
@@ -108,7 +109,7 @@ bool xbar_router::Has_Buffer_In(unsigned input_deviceID, unsigned size, bool upd
 bool xbar_router::Has_Buffer_Out(unsigned output_deviceID, unsigned size){
 	return (out_buffers[output_deviceID].size() + size <= out_buffer_limit);
 }
-
+/*
 void xbar_router::Advance() {
 	cycles++;
 
@@ -142,6 +143,59 @@ void xbar_router::Advance() {
 		out_buffer_util+=out_buffers[i].size();
 	}
 }
+*/
+
+void xbar_router::Advance() {
+	cycles++;
+
+	vector<unsigned> node_tmp;
+
+	for (unsigned i=0; i<total_nodes; ++i){
+		
+		if(!in_buffers[i].empty()){
+			Packet _packet_tmp = in_buffers[i].front();
+			if (!node_tmp.empty()){
+				if (std::find(node_tmp.begin(), node_tmp.end(), _packet_tmp.output_deviceID)!=node_tmp.end()){
+					conflicts++;
+				}
+				else 
+					node_tmp.push_back(_packet_tmp.output_deviceID);
+			}
+			else{
+				node_tmp.push_back(_packet_tmp.output_deviceID);
+			}
+		}
+	}
+
+	for(unsigned i=0; i<total_nodes; ++i){
+
+		if(Has_Buffer_Out(i, 1)) {
+			for(unsigned j=0; j<total_nodes; ++j){
+				unsigned node_id = (j+next_node[i])%total_nodes;
+
+				if(!in_buffers[node_id].empty()) {
+					Packet _packet = in_buffers[node_id].front();
+					if(_packet.output_deviceID==i){
+						out_buffers[_packet.output_deviceID].push(_packet);
+						in_buffers[node_id].pop();
+						next_node[i] = (++node_id % total_nodes);
+						break;
+					}
+				}
+			}
+		}
+		else
+			out_buffer_full++;
+	}
+
+	//collect some stats about buffer util
+	for(unsigned i=0; i<total_nodes; ++i){
+		in_buffer_util+=in_buffers[i].size();
+		out_buffer_util+=out_buffers[i].size();
+	}
+}
+
+
 
 bool xbar_router::Busy() const {
 
diff --git a/src/gpgpu-sim/local_interconnect.h b/src/gpgpu-sim/local_interconnect.h
index 502c80d..f4a2af1 100644
--- a/src/gpgpu-sim/local_interconnect.h
+++ b/src/gpgpu-sim/local_interconnect.h
@@ -82,7 +82,8 @@ private:
 	vector<queue<Packet> > out_buffers;
 	unsigned _n_shader, _n_mem, total_nodes;
 	unsigned in_buffer_limit, out_buffer_limit;
-	unsigned next_node;
+	vector<unsigned> next_node;
+//	unsigned next_node;
 	unsigned m_id;
 	enum Interconnect_type router_type;
 	unsigned active_in_buffers,active_out_buffers;
-- 
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