| commit | a4fd3dba6e285734bc635b0651a30dfeffedeada | [log] [tgz] |
|---|---|---|
| author | Fabian Ritter <fabian.ritter@amd.com> | Mon Oct 28 09:04:19 2024 +0100 |
| committer | GitHub <noreply@github.com> | Mon Oct 28 09:04:19 2024 +0100 |
| tree | 8534b669c66318b8e867065b74f1a0182201d54a | |
| parent | 35f6cc6af09f48f9038fce632815a2ad6ffe8689 [diff] |
[AMDGPU] Use wider loop lowering type for LowerMemIntrinsics (#112332) When llvm.memcpy or llvm.memmove intrinsics are lowered as a loop in LowerMemIntrinsics.cpp, the loop consists of a single load/store pair per iteration. We can improve performance in some cases by emitting multiple load/store pairs per iteration. This patch achieves that by increasing the width of the loop lowering type in the GCN target and letting legalization split the resulting too-wide access pairs into multiple legal access pairs. This change only affects lowered memcpys and memmoves with large (>= 1024 bytes) constant lengths. Smaller constant lengths are handled by ISel directly; non-constant lengths would be slowed down by this change if the dynamic length was smaller or slightly larger than what an unrolled iteration copies. The chosen default unroll factor is the result of microbenchmarks on gfx1030. This change leads to speedups of 15-38% for global memory and 1.9-5.8x for scratch in these microbenchmarks. Part of SWDEV-455845.
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.