[PATCH] D102541: [TTI] NFC: Change getRegUsageForType to return InstructionCost.

[Daniil Fukalov via Phabricator via llvm-commits]

dfukalov added a comment.

@sdesmalen this is needed to return from `getTypeLegalizationCost()` invalid costs, so at some point invalid legalization should be processed to a reg usage value, instead of asserting in `Optional<>::getValue()`.
What do you think, should it be processed explicitly in LV or yet in BasicTTIImplBase<>::getRegUsageForType?
In latter case, what reg usage value should it return for invalid (e.g. scalable vectors) legalization cost?


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  https://reviews.llvm.org/D102541/new/

https://reviews.llvm.org/D102541