From 77fb9893b4fb1108fdd71281a5090e25cb51630a Mon Sep 17 00:00:00 2001
From: Ben Sander <ben.sander@amd.com>
Date: Thu, 27 Jul 2017 11:11:54 -0500
Subject: [PATCH] Set HIP_SYNC_NULL_STREAM=0.

Optimizes null stream synchronization so it uses GPU-side dependency
resolution. Requires HCC __hcc_workweek__ > 17300.
---
 src/hip_hcc.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/hip_hcc.cpp b/src/hip_hcc.cpp
index 9d431df2dd..26799a9b11 100644
--- a/src/hip_hcc.cpp
+++ b/src/hip_hcc.cpp
@@ -86,13 +86,18 @@ int HIP_FORCE_SYNC_COPY = 0;
 int HIP_EVENT_SYS_RELEASE=1;
 int HIP_COHERENT_HOST_ALLOC = 0;
 
-// TODO - set to 0 once we resolve stability.
-// USE_ HIP_SYNC_HOST_ALLOC
 int HIP_SYNC_HOST_ALLOC = 1;
 
+
+#if (__hcc_workweek__ >= 17300)
+// Make sure we have required bug fix in HCC
+// Perform resolution on the GPU:
 // Chicken bit to sync on host to implement null stream.
 // If 0, null stream synchronization is performed on the GPU
+int HIP_SYNC_NULL_STREAM = 0;
+#else
 int HIP_SYNC_NULL_STREAM = 1;
+#endif
 
 // HIP needs to change some behavior based on HCC_OPT_FLUSH :
 #if (__hcc_workweek__ >= 17296)