From 0d92eb65d4a73916b0f0b57381db6762fb84dd8e Mon Sep 17 00:00:00 2001
From: Hansung Kim <hansung_kim@berkeley.edu>
Date: Wed, 18 Oct 2023 15:19:11 -0700
Subject: [PATCH] Increase sourceWidth to fix vx_wspawn sync bug

With sourceWidth = 1, we hit an unsynchronized vx_wspawn bug, where the
previously spawned warps get killed and overridden by a new vx_wspawn
call before all the warps complete execution.  Setting sourceWidth = 1
somehow slows down the progress of the spawned warps in relation to warp
0 (presumably because fetch stalls, but not sure why they would slow
down more than warp 0) and results in this bug.   sourceWidth = 4 seems
to work for vecadd.
---
 src/main/scala/tile/VortexTile.scala | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/main/scala/tile/VortexTile.scala b/src/main/scala/tile/VortexTile.scala
index 5b9cfa4..bd86ba5 100644
--- a/src/main/scala/tile/VortexTile.scala
+++ b/src/main/scala/tile/VortexTile.scala
@@ -91,7 +91,7 @@ class VortexTile private (
     minLatency = 1)))*/
 
   val numLanes = 4 // TODO: use Parameters for this
-  val sourceWidth = 1 // TODO: use Parameters for this
+  val sourceWidth = 4 // TODO: use Parameters for this
 
   val imemNodes = Seq.tabulate(1) { i =>
     TLClientNode(
@@ -99,7 +99,7 @@ class VortexTile private (
         TLMasterPortParameters.v1(
           clients = Seq(
             TLMasterParameters.v1(
-              sourceId = IdRange(0, 1 << 10), // TODO: magic numbers
+              sourceId = IdRange(0, 1 << sourceWidth),
               name = s"Vortex Core ${vortexParams.hartId} I-Mem $i",
               requestFifo = true,
               supportsProbe =