e070ea47a9
Since the OpenACC atomics specification is a subset of OpenMP atomics, the same lowering implementation can be used. This change extracts out the necessary pieces from the OpenMP lowering and puts them in a shared spot. The shared spot is a header file so that each implementation can template specialize directly. After putting the OpenMP implementation in a common spot, the following changes were needed to make it work for OpenACC: * Ensure parsing works correctly by avoiding hardcoded offsets. * Templatize based on atomic type. * The checking whether it is OpenMP or OpenACC is done by checking for OmpAtomicClauseList (OpenACC does not implement this so we just templatize with void). It was preferable to check this instead of atomic type because in some cases, like atomic capture, the read/write/update implementations are called - and we want compile time evaluation of these conditional parts. * The memory order and hint are used only for OpenMP. * Generate acc dialect operations instead of omp dialect operations. |
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| cmake/modules | ||
| docs | ||
| examples | ||
| include | ||
| lib | ||
| module | ||
| runtime | ||
| test | ||
| tools | ||
| unittests | ||
| .clang-format | ||
| .clang-tidy | ||
| .drone.star | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| LICENSE.TXT | ||
| README.md | ||
Flang
Flang is a ground-up implementation of a Fortran front end written in modern C++. It started off as the f18 project (https://github.com/flang-compiler/f18) with an aim to replace the previous flang project (https://github.com/flang-compiler/flang) and address its various deficiencies. F18 was subsequently accepted into the LLVM project and rechristened as Flang.
Please note that flang is not ready yet for production usage.
Getting Started
Read more about flang in the docs directory. Start with the compiler overview.
To better understand Fortran as a language and the specific grammar accepted by flang, read Fortran For C Programmers and flang's specifications of the Fortran grammar and the OpenMP grammar.
Treatment of language extensions is covered in this document.
To understand the compilers handling of intrinsics, see the discussion of intrinsics.
To understand how a flang program communicates with libraries at runtime, see the discussion of runtime descriptors.
If you're interested in contributing to the compiler, read the style guide and also review how flang uses modern C++ features.
If you are interested in writing new documentation, follow LLVM's Markdown style guide.
Consult the Getting Started with Flang for information on building and running flang.