RegAlloc: Use new approach to handling failed allocations (#128469) This fixes an assert after allocation failure. Rather than collecting failed virtual registers and hacking on the uses after the fact, directly hack on the uses and rewrite the registers to the dummy assignment immediately. Previously we were bypassing LiveRegMatrix and directly assigning in the VirtRegMap. This resulted in inconsistencies where illegal overlapping assignments were missing. Rather than try to hack in some system to manage these in LiveRegMatrix (i.e. hacking around cases with invalid iterators), avoid this by directly using the physreg. This should also allow removal of special casing in virtregrewriter for failed allocations.
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.