[PATCH] D122594: [ArgPromotion] Update min-legal-vector-width when do promotion

[Phoebe Wang via Phabricator via llvm-commits]

pengfei added a comment.

In D122594#3411792 <https://reviews.llvm.org/D122594#3411792>, @craig.topper wrote:

> Isn't X86TTIImpl::areTypesABICompatible supposed to be preventing promotion when it was cause a mismatch?

It doesn't work in complicated situations, e.g.: https://godbolt.org/z/386n6ErcY
On the other hand, I think it makes sense to always update `min-legal-vector-width` to the largest vector width.


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https://reviews.llvm.org/D122594