[PATCH] D123799: [RISCV] Mark FSIN and other math functions as Expand for scalable vectors.

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

In D123799#3457909 <https://reviews.llvm.org/D123799#3457909>, @liaolucy wrote:

> I would like to ask a question:
>
> What are the benefits of illegal costs?  Is there a problem that illegal costs are trying to solve?

It prevents the vectorize from creating llvm.sin, etc. with scalable vector types since they will crash in the backend.


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