5138b61a25
Some of the packed build_vector use vgpr_32 for i16/f16/bf16. In gfx11, bf16 arithmetic get promoted to f32 and this is done via v2i16 pack. In true16 mode this v2i16 pack is selected to a build_vector/v_lshlrev pattern which only accepts VGPR32. This causes isel to insert an illegal copy "vgpr32 = copy vgpr16" between def and use. In the end this illegal copy confuses cse pass and trigger wrong code elimination. Remove the packed build_vector pattern from true16. After removal, ISel will use vgpr16 build_vector patterns instead.
The LLVM Compiler Infrastructure
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.
Getting the Source Code and Building LLVM
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.
Getting in touch
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.