| commit | 4ae315ce04fc48021d1b80ae7ce2666c180e8e1e | [log] [tgz] |
|---|---|---|
| author | Jan Leyonberg <jan_sjodin@yahoo.com> | Fri Apr 19 15:50:55 2024 -0400 |
| committer | Copybara-Service <copybara-worker@google.com> | Fri Apr 19 12:54:45 2024 -0700 |
| tree | 8e3cb8e047523ad98757dab95af17bab6f624764 | |
| parent | 7e7cc776f5e230d8e1403e26ad61717884b9529a [diff] |
[flang][OpenMP] Use maxnum/minnum for lowering of max/min reduction operators (#89258) This patch changes the lowering of max and min to be lowered to arith::MaxNumFop and arith::MinNumFOp instead of using arith::MaximumFOp and arith::MinimumFOp. The arith::MaximumFOp and arith::MinimumFOp map to the corresponding intrinsics llvm.maximum.* and llvm.minimum.* intrinsics which conform to the semantics specified in the draft of IEEE 754-2019, which is not supported by all hardware. Instead using arith::MaximumFOp and arith::MinimumFOp will allow code generation for more targets and match the code generated by clang OpenMP. fixes #87955 GitOrigin-RevId: 0c455ee34823cb991a35e33ff020bb7cc4e44c8a
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.