[PATCH] D108138: [SimplifyCFG] Remove switch statements before vectorization

[David Sherwood via Phabricator via llvm-commits]

david-arm added a comment.

In D108138#2967133 <https://reviews.llvm.org/D108138#2967133>, @lebedev.ri wrote:

> How is it conceptually different to break apart IR in LV itself, or do the same in a special pass just before that?
> If we want to go this road, we need to completely make `switch`es illegal/non-canonical before LV.

If I understand correctly you're suggesting that LV makes a scalar transformation prior to legalisation checks/cost model analysis? If that's the case then I don't think we can do that as this is beyond LV's remit and I don't see how that's any different to making a scalar transformation in a separate pass prior to LV.


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