876816ff18
This will result in larger atomic operations getting expanded to `__atomic_*` libcalls via AtomicExpandPass, which matches what Clang already does in the frontend. Additionally, adjust some comments, and remove partial code dealing with larger-than-128bit atomics, as it's now unreachable. AArch64 always supports 128-bit atomics, so there's no conditionals needed here. (Though: we really ought to require that a 128-bit load is available, not just a cmpxchg, which would mean conditioning on LSE2. But that's future work.) The arm64-irtranslator.ll test was adjusted as it was using an i258 type as a hack to avoid IR atomic lowering to test GlobalISel behavior. Pass -mattr=+lse and use i32, instead, to accomplish that goal in a way that continues to work.
The LLVM Compiler Infrastructure
Welcome to the LLVM project!
This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.
The LLVM project has multiple components. The core of the project is itself called "LLVM". This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.
C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.
Other components include: the libc++ C++ standard library, the LLD linker, and more.
Getting the Source Code and Building LLVM
Consult the Getting Started with LLVM page for information on building and running LLVM.
For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.
Getting in touch
Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.
The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.