[flang][cuda] Delay box cuf.alloc past host association captures (#214347) CUFAllocDelay treated the store of a descriptor into a host association tuple as a use, so a device allocatable captured by an internal procedure kept its descriptor allocation in the prologue. That allocates managed memory before the program can call cudaSetDevice, binding a CUDA context to the wrong device. The store now sinks together with the allocation, constrained by the tuple's readers, and the group is placed at the nearest common dominator of all uses so it can sink into a later block. GitOrigin-RevId: 239cbf5baf092fc738e59443d11948b26d8db386
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.