| commit | 008f26b12e348a07228d7c61304bb22f13a1e7fb | [log] [tgz] |
|---|---|---|
| author | Manos Anagnostakis <manos.anagnostakis@vrull.eu> | Thu Sep 14 17:58:39 2023 +0300 |
| committer | GitHub <noreply@github.com> | Thu Sep 14 16:58:39 2023 +0200 |
| tree | 7dead91896d4521b9198bb7d8786dbd3eecd5641 | |
| parent | b7d02d7e12f96c9c9a735a0255c2b5600fc16067 [diff] |
[AArch64] New subtarget features to control ldp and stp formation (#66098) On some AArch64 cores, including Ampere's ampere1 and ampere1a architectures, load and store pair instructions are faster compared to simple loads/stores only when the alignment of the pair is at least twice that of the individual element being loaded. Based on that, this patch introduces four new subtarget features, two for controlling ldp and two for controlling stp, to cover the ampere1 and ampere1a alignment needs and to enable optional fine-grained control over ldp and stp generation in general. The latter can be utilized by another cpu, if there are possible benefits with a different policy than the default provided by the compiler. More specifically, for each of the ldp and stp respectively we have: - disable-ldp/disable-stp: Do not emit ldp/stp. - ldp-aligned-only/stp-aligned-only: Emit ldp/stp only if the source pointer is aligned to at least double the alignment of the type. Therefore, for -mcpu=ampere1 and -mcpu=ampere1a ldp-aligned-only/stp-aligned-only become the defaults, because of the benefit from the alignment, whereas for the rest of the cpus the default behaviour of the compiler is maintained.
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, or #llvm IRC channel on OFTC.
The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.