[llvm-dev] [RFC] Extending shufflevector for vscale vectors (SVE etc.)

Richard Sandiford via llvm-dev llvm-dev at lists.llvm.org
Thu Jan 30 03:35:50 PST 2020

Eli Friedman via llvm-dev <llvm-dev at lists.llvm.org> writes:
> [...]
> We can add more shuffles to the list.  There are a few SVE shuffle
> instructions which are not equivalent to any of the basic operations
> I've listed: ext and trn.

I realise this wasn't supposed to be an exhaustive list, but FWIW:
revb, revh and revw are also useful for reversing each sequence
of N elements (as opposed to reversing the whole vector).


> And it's possible to construct other shuffles out of sequences of
> multiple instructions.  (Some of the additional shuffles we could
> specify would require an integer parameter, or an integer parameter
> list; it should be possible to support that without any major changes
> to the proposal.)
> -Eli
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

More information about the llvm-dev mailing list