[llvm-dev] [RFC] AAP Backend

Ed Jones via llvm-dev llvm-dev at lists.llvm.org
Wed Nov 16 08:36:41 PST 2016

Hi all,

I have just updated most of the patches to roll them forwards to LLVM
top-of-tree, and incorporated various suggested changes. We're still
looking for reviewers, if anyone is interested.

Thank you,
Edward Jones

On 15/09/16 17:12, Ed Jones wrote:
> I have now posted the final two patches for the backend to add
> Disassembler support, ISel and CodeGen. The full list of patches is now:
> https://reviews.llvm.org/D23664 - AAP triple and target
> https://reviews.llvm.org/D23665 - ELF definitions
> https://reviews.llvm.org/D23667 - Stub backend
> https://reviews.llvm.org/D23770 - InstrInfo, RegInfo Tablegen
> https://reviews.llvm.org/D23771 - MC layer support
> https://reviews.llvm.org/D23772 - AsmParser
> https://reviews.llvm.org/D23773 - InstPrinter
> https://reviews.llvm.org/D24612 - Disassembler support
> https://reviews.llvm.org/D24613 - Code generation
> Currently only the first patch has been accepted, and we are looking for
> more people to review the remaining patches.
> Thank you,
> Ed Jones
> On 18/08/16 08:34, Ed Jones wrote:
>> Hi all,
>> We wish to submit our latest AAP implementation as an experimental
>> backend into LLVM. We need community feedback and reviewers for patches
>> which we will submit soon.
>> AAP was designed in early 2015 and aims to advance compiler development
>> for small deeply embedded Harvard architectures, which are widely used
>> commercially. AAP is freely available as an open source softcore for use
>> in FPGA designs.
>> AAP has wide exposure: at ORCONF16 at CERN, at FOSDEM and at BCS and
>> OSHUG meetings. It is also of commercial interest, because of the
>> potential benefits of providing upstream LLVM support for features found
>> in small embedded processors.
>> Currently there is a complete Clang and LLVM toolchain including gdb, ld
>> and binutils, as well as two simulator implementations. The toolchain is
>> passing all LLVM regression tests and a decent proportion of GCC
>> regression tests. We are also working on a GCC port to allow comparison
>> between compilers, which should be beneficial to both projects.
>> We believe the code base is sufficiently mature that it is appropriate
>> for inclusion. Currently, the full source for AAP can be found on Github:
>> https://github.com/embecosm
>> Details about the ISA, and the hardware implementation can be found on
>> our website:
>> http://www.embecosm.com/resources/appnotes/#EAN13
>> http://www.embecosm.com/resources/appnotes/#EAN14
>> We are also planning to talk about AAP at the LLVM Cauldron in Hebden
>> Bridge. We look forward to discussing our work on AAP with those who are
>> attending.
>> Thank you,
>> Ed Jones

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