commit | 2844e7409a79d2a28beba0dc282c2f54263a2eed | [log] [tgz] |
---|---|---|
author | jeanPerier <jperier@nvidia.com> | Mon Apr 08 10:22:44 2024 +0200 |
committer | Copybara-Service <copybara-worker@google.com> | Mon Apr 08 01:25:50 2024 -0700 |
tree | de751a5e1cc23fa59cb96c113d9b1da998248323 | |
parent | 4d624a2ad78224bd27ccba2348d2148585b68fc5 [diff] |
[flang] Fix source allocation to explicit length after deferred length object (#87785) Flang supports source allocation to allocatable or pointers with a non deferred length that do not match the source length. This documented at: https://github.com/llvm/llvm-project/blob/9708d0900311503aa4685d6810d8caf0412e15d7/flang/docs/Extensions.md?plain=1#L312 The current lowering code was bugged when such explicit length allocate object appeared after a deferred length object in the source allocation list: Since "lenParams" had been computed when generating allocation of the deferred length object, the call to genSetDeferredLengthParameters was not a no-op on when lowering the explicit length allocation, and the explicit length was overridden with the source length. The output of the program added in test was: ``` ZZheZZ ZZhelloZZ ZZhelloZZ ``` Instead of: ``` ZZheZZ ZZhelloZZ ZZhello ZZ ``` Skip genSetDeferredLengthParameters when the allocate object has non deferred length. GitOrigin-RevId: 6a7da2e30dc38ba92875bfe1da5520c950bab1e3
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.