MachineLICM: Stop checking kill flags in register pressure estimate (#229201) This was checking kill flags, or hasOneNonDBGUse as a kill approximation. The kill flag case appears to be of no practical use. InstrEmitter does not emit the kill flag in the multiple user cases that would be required and I've only managed to trigger a different hoisting decision with hand modified MIR. The flag disagrees with hasOneNonDBGUse in 40 CodeGen tests (mostly custom-inserter loops such as AMDGPU waterfalls and atomic expansions), but removing it does not change the output of any CodeGen test.
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.
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.
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.