| commit | 9b8bc53a0bdc270f6d675ba7a2fe9ca9a855610d | [log] [tgz] |
|---|---|---|
| author | Chengjun <chengjunp@Nvidia.com> | Fri Apr 18 03:30:05 2025 -0700 |
| committer | GitHub <noreply@github.com> | Fri Apr 18 12:30:05 2025 +0200 |
| tree | d1b7db6ffac38b7f6c0047d3f5d740153050b7ad | |
| parent | 9bdd9dc895ade41ec24f1a9918f70b23271ac89b [diff] |
[FlattenCFG] Fix an Imprecise Usage of AA (#128117) In current `FlattenCFG`, using `isNoAlias` for two instructions is imprecise. For example, when passing a store instruction and a load instruction directly into `AA->isNoAlias`, it will always return `NoAlias`. This happens because when checking the types of the two Values, the store instruction (which has a `void` type) causes the analysis to return `NoAlias`. For instructions, we should use `getModRefInfo` instead of `isNoAlias`, as aliasing is a concept of memory locations. In this patch, `AAResults::getModRefInfo` is supported to take in two instructions. It will check whether two instructions may access the same memory location or not. And in `FlattenCFG`, we use this new helper function to do the check instead of `isNoAlias`. Unit tests and lit tests are also included to this patch.
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.