tree 0e6fc882cb8358b6a15396206b3e415e679aed68
parent 0afc673b1708437b5d9ff8ce0d50b41ab3b776b8
author Alexey Bataev <a.bataev@hotmail.com> 1561660389 +0000
committer Alexey Bataev <a.bataev@hotmail.com> 1561660389 +0000

[OPENMP][NVPTX]Relax flush directive.

Summary:
According to the OpenMP standard, flush  makes a thread’s temporary view of memory consistent with memory and enforces an order on the memory operations of the variables explicitly specified or implied.

According to the Cuda toolkit documentation (https://docs.nvidia.com/cuda/archive/8.0/cuda-c-programming-guide/index.html#memory-fence-functions), __threadfence() functions provides required functionality.

__threadfence_system() also provides required functionality, but it also
includes some extra functionality, like synchronization of page-locked
host memory, synchronization for the host, etc. It is not required per
the standard and we can use more relaxed version of memory fence
operation.

Reviewers: grokos, gtbercea, kkwli0

Subscribers: guansong, jfb, jdoerfert, openmp-commits, caomhin

Tags: #openmp

Differential Revision: https://reviews.llvm.org/D62397

git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@364572 91177308-0d34-0410-b5e6-96231b3b80d8