[PATCH] D94142: [IR] Allow scalable vectors in structs to support intrinsics returning multiple values.

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

In D94142#2484167 <https://reviews.llvm.org/D94142#2484167>, @kito-cheng wrote:

>> Don't allow function arguments or returns to use structs containing scalable vectors unless they are intrinsics.
>
> This is RISC-V specific question: Does it means we disallow passing register tuple type (NF>1) in future too?

I hope we can just break them down to individual values when clang generates IR. The generic code in SelectionDAG for returning a struct depends on being able to compute offsets so we'll definitely need to be careful with returns.


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