Reapply "[utils][UpdateLLCTestChecks] Add MIR support to update_llc_test_checks.py." (#164965) (#166575) This change enables update_llc_test_checks.py to automatically generate MIR checks for RUN lines that use `-stop-before` or `-stop-after` flags allowing tests to verify intermediate compilation stages (e.g., after instruction selection but before peephole optimizations) alongside the final assembly output. If `-debug-only` flag is present in the run line it's considered as the main point of interest for testing and stop flags above are ignored (that is no MIR checks are generated). This resulted from the scenario, when I needed to test two instruction matching patterns where the later pattern in the peepholer reverts the earlier pattern in the instruction selector and distinguish it from the case when the earlier pattern didn't worked at all. Initially created by Claude Sonnet 4.5 it was improved later to handle conflicts in MIR <-> ASM prefixes and formatting.
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.