llvm-project/openmp/libomptarget
Carlo Bertolli 7b731f4d0b [OpenMP][libomptarget] Delay restore of shadow pointers in structs to after H2D memory copies are completed
When using asynchronous plugin calls, shadow pointer restore could happen before the D2H copy for the entire struct has completed, effectively leaving a device pointer in a host struct.
This patch fixes the problem by delaying restore's to after a synchronization happens (target regions) and by calling early synchronization (target update).

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D119968
2022-02-18 10:09:10 -06:00
..
DeviceRTL [OpenMP] Add flag for disabling thread state in runtime 2022-02-18 08:35:05 -05:00
cmake/Modules [NFC][libomptarget] Fixed -DLLVM_ENABLE_RUNTIMES="openmp" build. 2021-06-18 09:20:10 -07:00
docs [NFC] Initial documentation for declare target indirect support. 2021-11-08 15:12:03 -08:00
include Runtime for Interop directive 2022-01-27 15:16:24 -05:00
plugins [Libomptarget] Run CPU offloading tests using the new driver 2022-02-15 15:05:32 -05:00
src [OpenMP][libomptarget] Delay restore of shadow pointers in structs to after H2D memory copies are completed 2022-02-18 10:09:10 -06:00
test [OpenMP][Offloading] Fix test case issues in bug49334.cpp 2022-02-17 10:22:48 -05:00
tools [OpenMP] Fixing llvm-omp-device-info compilation with runtimes 2021-07-30 13:09:08 -05:00
utils Revert "[OpenMP] Codegen aggregate for outlined function captures" 2021-09-21 13:20:39 -07:00
CMakeLists.txt [Libomptarget] Run CPU offloading tests using the new driver 2022-02-15 15:05:32 -05:00
README.txt

README.txt

    README for the LLVM* OpenMP* Offloading Runtime Library (libomptarget)
    ======================================================================

How to Build the LLVM* OpenMP* Offloading Runtime Library (libomptarget)
========================================================================
In-tree build:

$ cd where-you-want-to-live
Check out openmp (libomptarget lives under ./libomptarget) into llvm/projects
$ cd where-you-want-to-build
$ mkdir build && cd build
$ cmake path/to/llvm -DCMAKE_C_COMPILER=<C compiler> -DCMAKE_CXX_COMPILER=<C++ compiler>
$ make omptarget

Out-of-tree build:

$ cd where-you-want-to-live
Check out openmp (libomptarget lives under ./libomptarget)
$ cd where-you-want-to-live/openmp/libomptarget
$ mkdir build && cd build
$ cmake path/to/openmp -DCMAKE_C_COMPILER=<C compiler> -DCMAKE_CXX_COMPILER=<C++ compiler>
$ make

For details about building, please look at README.rst in the parent directory.

Architectures Supported
=======================
The current library has been only tested in Linux operating system and the
following host architectures:
* Intel(R) 64 architecture
* IBM(R) Power architecture (big endian)
* IBM(R) Power architecture (little endian)
* ARM(R) AArch64 architecture (little endian)

The currently supported offloading device architectures are:
* Intel(R) 64 architecture (generic 64-bit plugin - mostly for testing purposes)
* IBM(R) Power architecture (big endian) (generic 64-bit plugin - mostly for testing purposes)
* IBM(R) Power architecture (little endian) (generic 64-bit plugin - mostly for testing purposes)
* ARM(R) AArch64 architecture (little endian) (generic 64-bit plugin - mostly for testing purposes)
* CUDA(R) enabled 64-bit NVIDIA(R) GPU architectures

Supported RTL Build Configurations
==================================
Supported Architectures: Intel(R) 64, IBM(R) Power 7 and Power 8

              ---------------------------
              |   gcc      |   clang    |
--------------|------------|------------|
| Linux* OS   |  Yes(1)    |  Yes(2)    |
-----------------------------------------

(1) gcc version 4.8.2 or later is supported.
(2) clang version 3.7 or later is supported.


Front-end Compilers that work with this RTL
===========================================

The following compilers are known to do compatible code generation for
this RTL:
  - clang (from https://github.com/clang-ykt )
  - clang (development branch at http://clang.llvm.org - several features still
    under development)

-----------------------------------------------------------------------

Notices
=======
This library and related compiler support is still under development, so the
employed interface is likely to change in the future.

*Other names and brands may be claimed as the property of others.