[llvm-dev] [RFC] Make Lanai backend non-experimental

Mehdi Amini via llvm-dev llvm-dev at lists.llvm.org
Tue Jul 19 15:59:44 PDT 2016

> On Jul 19, 2016, at 12:57 PM, Pete Cooper via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> Hi Renato
>> On Jul 19, 2016, at 9:42 AM, Renato Golin via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>> A few basic rules to get accepted are if:
>> * the target exists and can be easily purchased / emulated for
>> investigating problems,
>> * there are official documents / specs published by the project /
>> company that maintains the targets,
>> * there is a reasonable community maintaining the rest of the system
>> (firmware, OS, other tools, etc),
>> * enough people commit themselves to maintain the LLVM back-end to
>> avoid bit-rot,
>> * the back-end is free of contentious features that would mean
>> breaking every other target.
> This is an excellent list.  We should probably have something like it in the docs if we don’t already.

Agree with Pete.

I’d add (because the community will have to maintain it somehow):
- good code quality and documentation
- good testing (small tests, documented, with good coverage).


> I have no problem with Lanai in LLVM (non-experimentally) if it meets most of these criteria to some degree.  Obviously that doesn’t mean every target in LLVM needs to have detailed microarchitecture documents, but a basic ISA should be publicly available.  Personally I also think the ability to at least simulate the code is very important too.
> I tried googling it but mostly found news reports about the existence of the backend, not documentation or anything else.
> I think the Lanai community have done an excellent job meeting the last 2 points.  However, I’d really appreciate more information on the first 3.  I think meeting each of them (even minimally) is important to leave experimental status.
> Thanks,
> Pete
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