d3fe1df194
At the moment, the effectivness of guards that contain divisibility information (A % B == 0 ) depends on the order of the conditions. This patch makes using divisibility information independent of the order, by collecting and applying the divisibility information separately. We first collect all conditions in a vector, then collect the divisibility information from all guards. When processing other guards, we apply divisibility info collected earlier. After all guards have been processed, we add the divisibility info, rewriting the existing rewrite. This ensures we apply the divisibility info to the largest rewrite expression. This helps to improve results in a few cases, one in https://github.com/dtcxzyw/llvm-opt-benchmark/pull/2921 and another one in a different large C/C++ based IR corpus. PR: https://github.com/llvm/llvm-project/pull/163021
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.