[AArch64] Optimize memset to use NEON DUP instruction for more sizes (#166030) This change improves memset code generation for non-zero values on AArch64 by using NEON's DUP instruction instead of the less efficient multiplication with 0x01010101 pattern. For small sizes, the value is extracted from a larger DUP. For non-power-of-two sizes, overlapping stores are used in some cases. TargetLowering::findOptimalMemOpLowering is modified to allow explicitly specifying the size of the constant in cases where the constant is larger than the store operations. Fixes #165949
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.