From bb309e573f063188d05f9341651177da8470962f Mon Sep 17 00:00:00 2001
From: "Wesley W. Terpstra" <wesley@sifive.com>
Date: Tue, 20 Jun 2017 14:10:25 -0700
Subject: [PATCH] TLSplitter: special-case the case of no split necessary

---
 src/main/scala/uncore/tilelink2/Splitter.scala | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/scala/uncore/tilelink2/Splitter.scala b/src/main/scala/uncore/tilelink2/Splitter.scala
index 7043c461..96e600b7 100644
--- a/src/main/scala/uncore/tilelink2/Splitter.scala
+++ b/src/main/scala/uncore/tilelink2/Splitter.scala
@@ -42,7 +42,9 @@ class TLSplitter(policy: TLArbiter.Policy = TLArbiter.roundRobin)(implicit p: Pa
     def group[T](x: Seq[T]) =
       if (x.isEmpty) Nil else x.grouped(node.edgesIn.size).toList.transpose
 
-    ((node.edgesIn zip io.in) zip (group(node.edgesOut) zip group(io.out))) foreach {
+    if (node.edgesIn.size <= 1) {
+      io.out <> io.in
+    } else ((node.edgesIn zip io.in) zip (group(node.edgesOut) zip group(io.out))) foreach {
       case ((edgeIn, io_in), (edgesOut, io_out)) =>
 
       // Grab the port ID mapping