[ARM] Fix instruction selection for MVE vsbciq intrinsic (#118284) There were two bugs in the implementation of the MVE vsbciq (subtract with carry across vector, with initial carry value) intrinsics: * The VSBCI instruction behaves as if the carry-in is always set, but we were selecting it when the carry-in is clear. * The vsbciq intrinsics should generate IR with the carry-in set, but they were leaving it clear. These two bugs almost cancelled each other out, but resulted in incorrect code when the vsbcq intrinsics (with a carry-in) were used, and the carry-in was a compile time 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.