[llvm-dev] [RFC] AAP Backend

Alex Rosenberg via llvm-dev llvm-dev at lists.llvm.org
Tue Aug 23 13:28:31 PDT 2016

I don't think we've ever really built up clear guidance on this, but I think there needs to be a clear determination that a given target has enough active users to make the maintenance burden worth putting into the mainline. In the past, the only exception I can think of is the Lanai backend, but in that case we have a strong commitment of multiple employees at a major corporation committed to that target's maintenance.

So, concretely, can you quantify the active customers for this target?


On Aug 18, 2016, at 12:34 AM, Ed Jones via llvm-dev <llvm-dev at lists.llvm.org> 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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