From: Gheorghe-Teodor Bercea <gheorghe-teod.bercea@ibm.com>
Date: Mon, 3 Dec 2018 15:21:49 +0000 (+0000)
Subject: [OpenMP][libomptarget] Flush intermediate values during team reduction
X-Git-Tag: llvmorg-8.0.0-rc1~3052
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=10b2e60b7e99dec7941758371a7684c324df22d6;p=platform%2Fupstream%2Fllvm.git

[OpenMP][libomptarget] Flush intermediate values during team reduction

Summary: Ensure intermediate values of a team reduction are flushed to memory.

Reviewers: ABataev, caomhin

Reviewed By: ABataev

Subscribers: guansong, jfb, openmp-commits

Differential Revision: https://reviews.llvm.org/D55219

llvm-svn: 348148
---

diff --git a/openmp/libomptarget/deviceRTLs/nvptx/src/reduction.cu b/openmp/libomptarget/deviceRTLs/nvptx/src/reduction.cu
index bbe4ad1..a9e35a1 100644
--- a/openmp/libomptarget/deviceRTLs/nvptx/src/reduction.cu
+++ b/openmp/libomptarget/deviceRTLs/nvptx/src/reduction.cu
@@ -444,6 +444,7 @@ EXTERN int32_t __kmpc_nvptx_teams_reduce_nowait_simple(kmp_Ident *loc,
 EXTERN void
 __kmpc_nvptx_teams_end_reduce_nowait_simple(kmp_Ident *loc, int32_t global_tid,
                                             kmp_CriticalName *crit) {
+  __threadfence_system();
   (void)atomicExch((uint32_t *)crit, 0);
 }