[llvm-dev] Legalizing vector types

[Eli Friedman via llvm-dev]

You should be able to override TargetLowering::getPreferredVectorAction to prefer splitting v8i8.

-Eli

> -----Original Message-----
> From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Sebastien Le
> Duc via llvm-dev
> Sent: Friday, January 3, 2020 8:02 AM
> To: 'llvm-dev' <llvm-dev at lists.llvm.org>
> Subject: [EXT] [llvm-dev] Legalizing vector types
>
> Hi all,
> I am working on a target that has support for v4i16 vectors, and no
> support for v4i8 / v8i8 / v8i16
>
> V4i8 is promoted to v4i16 which is nice
> V8i16 is split to 2 x v4i16 which is nice as well
>
> Now v8i8 is scalarized, which is not so nice.
> Ideally I would like v8i8 to be first promoted to v8i16 then split to
> 2xv4i16 (or split to 2xV4i8 then promoted to 2xv4i16)
>
> Is there a way to achieve that? I tried to figure out how to do it, but
> the only way I found is to make v8i16 legal, and handle the splitting to
> 2xv4i16 as patterns, which looks to me to be a lot of useless work…
>
> Thanks in advance.
>
> Regards,
> Sebastien
>
>
>
>
>
>
>
> Sébastien Le Duc
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