[profcheck] Fix profle metatdata propagation for Large Integer operations (#175862) This PR improves the propagation of profile metadata within the ExpandIRInsts pass. When lowering large integer division operations, the pass now ensures that branch weights are correctly attached to the generated control flow, preventing the loss of profile data during IR expansion. This PR improves signed and unsigned division/remainder for non-native bit widths (e.g., `sdiv/udiv i129`, `srem/urem i129`) and implemented Heuristic-Based Branch Weights labeling using established heuristics for edge cases e.g., `Division-by-zero guards` and `Magnitude comparisons between dividends and divisors`. It also adds detailed comments within the expansion logic to explain the rationale behind specific branch weight choices and the underlying mathematical invariants. Please refer to the implementation details in the source code for the specific branch weight values and the logic governing their application. Co-authored-by: Jonas Devlieghere <jonas@devlieghere.com>
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.