Commit Graph

3 Commits

Author SHA1 Message Date
Michael Kruse 83ff0ff463 [Clang][OpenMP] Allow unified_shared_memory for Pascal-generation GPUs.
The Pascal architecture supports the page migration engine required for
unified_shared_memory, as indicated by NVIDIA:
 * https://developer.nvidia.com/blog/unified-memory-cuda-beginners/
 * https://developer.nvidia.com/blog/beyond-gpu-memory-limits-unified-memory-pascal/
 * https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#um-requirements

The limitation was introduced in D54493 which justified the cut-off by
the requirement for unified addressing. However, Unified Virtual
Addressing (UVA) is already available with sm20 (Fermi, Kepler,
Maxwell):
 * https://docs.nvidia.com/cuda/gpudirect-rdma/index.html#basics-of-uva-cuda-memory-management

Unified shared memory might even be possible with these, but with
migration of entire allocations on kernel startup.

Reviewed By: JonChesterfield

Differential Revision: https://reviews.llvm.org/D101595
2021-05-13 17:15:34 -05:00
Alexey Bataev 7b710a4294 [OPENMP]Improve diagnostics for unsupported unified addressing.
Improved diagnostics for better user experience.
2019-11-05 10:31:59 -05:00
Patrick Lyster 8f7f586e53 [OpenMP] Check target architecture supports unified shared memory for requires directive. Differential Review: https://reviews.llvm.org/D54493
llvm-svn: 347214
2018-11-19 15:09:33 +00:00