[LV] Revert back to use Loop::isLoopInvariant in isPredicatedInst. (#150828) This partially reverts https://github.com/llvm/llvm-project/pull/140744, restoring the original TheLoop->isLoopInvariant check instead the more powerful Legal->isInvariant, which uses SCEV. This causes a mis-compile, because SCEV can prove that the stored value is loop-invariant, which in turn converts the store to a uniform store. But in VPlan, we aren't yet able to determine that the stored value is loop-invariant, so we extract the last lane, which is incorrect, because it does not account for the mask of the store. Restoring the original code is a safe fix and avoids this subtle divergence. Fixes https://github.com/llvm/llvm-project/issues/149347. PR: https://github.com/llvm/llvm-project/pull/150828
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.