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llvm-project/openmp/libomptarget
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Johannes Doerfert a7b7b5dfe5 [OpenMP] Create and use `__kmpc_is_generic_main_thread` 
In order to fold calls based on high-level knowledge and control flow
tracking it helps to expose the information as a runtime call. The
logic: `!SPMD && getTID() == getMasterTID()` was used in various places
and is now encapsulated in `__kmpc_is_generic_main_thread`. As part of
this rewrite we replaced eager computation of arguments with on-demand
computation, especially helpful if the calls can be folded and arguments
don't need to be computed consequently.

Differential Revision: https://reviews.llvm.org/D105768
 		2021-07-11 19:18:03 -05:00
..
cmake/Modules [NFC][libomptarget] Fixed -DLLVM_ENABLE_RUNTIMES="openmp" build. 2021-06-18 09:20:10 -07:00
deviceRTLs [OpenMP] Create and use `__kmpc_is_generic_main_thread` 2021-07-11 19:18:03 -05:00
include [OpenMP] Add an information flag for device data transfers 2021-06-08 20:23:27 -04:00
plugins [libomptarget][nfc] Group environment variables, drop accesses to DeviceInfo global 2021-07-06 17:06:38 +01:00
src [OpenMP] Avoid checking parent reference count in targetDataBegin 2021-07-10 12:15:04 -04:00
test [OPENMP]Fix overlapped mapping for dereferenced pointer members. 2021-07-09 12:51:26 -07:00
utils [OpenMP] Simplify offloading parallel call codegen 2021-04-21 18:46:07 -07:00
CMakeLists.txt [AMDGPU][OpenMP] Enable Libomptarget runtime tests 2021-05-03 05:56:42 +00:00
README.txt Unify build documentation and convert to reStructuredText 2017-12-27 09:15:10 +00:00

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.