[LLVMdev] [PATCH][RFC] HSAIL Target

[Sean Silva]

On Tue, Jun 30, 2015 at 7:34 PM, JF Bastien <jfb at google.com> wrote:

> One of the important property of MC is avoiding the need for two code
>> paths in the code generator.
>>
>> If MC cannot support the format you need, we should work on fixing that
>> in a way that maintains the property that most code is shared when writing
>> objects or assembly. This is a need that is shared by Webassembly I think.
>>
>>
>> My suggestion would be to start with just the assembly printing path and
>> work to figure out what needs to happen in MC.
>>
>>
>> It will take a long time to come up with a replacement for emitting BRIG
>> in MC. How blocking of an issue is this to getting this committed? If
>> really necessary, I can strip out the BRIG stuff, but would need to
>> constantly maintain a patch re-adding it on top of trunk which would be a
>> huge hassle so I would rather not.
>>
>
> Dan and I have talked to a few folks who have given us the same feedback
> for WebAssembly: we should consider using MC for virtual ISA emission, even
> though it isn't quite suitable as it exists in LLVM today. It's an
> opportunity to fix LLVM. Dan and I don't know much about MC, but we are
> going to explore this route.
>

It might be worth having a discussion on LLVMDev about "virtual ISA's".
With HSAIL, WebAssembly, and SPIR-V off the top of my head, it sounds like
we should have some sort of common discussion about them, since some of the
issues appear to be the same.

-- Sean Silva


>
> I have no opinion on how this should affect HSAIL's current patch. Dan and
> I are willing to take the lead on this, and would be happy to work with
> other virtual ISAs to make sure architectural changes to MC make sense for
> their usecases.
>
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