| commit | 6bfb3d04c69eeb2487e03404219ce99f205f8311 | [log] [tgz] |
|---|---|---|
| author | Slava Zakharin <szakharin@nvidia.com> | Tue Mar 05 13:36:48 2024 -0800 |
| committer | Copybara-Service <copybara-worker@google.com> | Tue Mar 05 13:56:21 2024 -0800 |
| tree | fbfda24ccc13f35b13edf4a622d544ca61b07342 | |
| parent | 19d5e20f391da5d7081c9d3fe27b9eb8c7bb6d52 [diff] |
[flang] Added lowering and runtime for COMPLEX(16) intrinsics. (#83874) For `LDBL_MANT_DIG == 113` targets the FortranFloat128Math library is just an interface library that provides sources and compilation options to be used for building FortranRuntime - there are not extra dependencies on other libraries, so it can be a part of FortranRuntime, which helps to avoid extra linking steps in the compiler driver. Targets with __float128 support in libc will also use this path. Other targets, where the math support comes from FLANG_RUNTIME_F128_MATH_LIB, FortranFloat128Math is built as a standalone static library, and the compiler driver needs to conduct the linking. Flang APIs for COMPLEX(16) are just thin C wrappers around the C math functions. Flang uses C _Complex ABI for passing/returning COMPLEX values, so the runtime is aligned to this. GitOrigin-RevId: 50d848d0761e052e203136f3de9a332bd619595a
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.