[AArch64][GlobalISel] Add a constant funnel shift post-legalizer combine. (#151912) We want to be able to produce extr instructions post-legalization. They are legal for scalars, acting as a funnel shift with a constant shift amount. Unfortunately I'm not sure if there is a way currently to represent that in the legalization rules, but it might be useful for several operations - to be able to treat and test operands with constant operands as legal or not. This adds a change to the existing matchOrShiftToFunnelShift so that AArch64 can generate such instructions post-legalization providing that the operation is scalar and the shift amount is constant.
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.