| commit | 80d41051783171c3804c88fa1cdf30284395767e | [log] [tgz] |
|---|---|---|
| author | Sergio Afonso <safonsof@amd.com> | Thu Oct 31 16:39:53 2024 +0000 |
| committer | Copybara-Service <copybara-worker@google.com> | Thu Oct 31 09:41:36 2024 -0700 |
| tree | 6d629566d3ab26f9a28dec754e205ddfdea10ecf | |
| parent | 3faa84ebaa3ab2f4872b53ef8fc6f1ffd05db205 [diff] |
[Flang][OpenMP] Properly bind arguments of composite operations (#113682) When composite constructs are lowered, clauses for each leaf construct are lowered before creating the set of loop wrapper operations, using these outside values to populate their operand lists. Then, when the loop nest associated to that composite construct is lowered, the binding of Fortran symbols to the entry block arguments defined by these loop wrappers is performed, resulting in the creation of `hlfir.declare` operations in the entry block of the `omp.loop_nest`. This approach prevents `hlfir.declare` operations related to the binding and other operations resulting from the evaluation of the clauses from being inserted between loop wrapper operations, which would be an illegal MLIR representation. However, this introduces the problem of entry block arguments defined by a wrapper that then should be used by one of its nested wrappers, because the corresponding Fortran symbol would still be mapped to an outside value at the time of gathering the list of operands for the nested wrapper. This patch adds operand re-mapping logic to update wrappers without changing when clauses are evaluated or where the `hlfir.declare` creation is performed. GitOrigin-RevId: 6c28530ed082204a1b6d20b45482e81d4cd5ead4
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.
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.