LiaoChunyu 03a3654203 [RISCV] Add cost model for SK_Broadcast ...

Add cost model for broadcast shuffle in RISCVTTIImpl::getShuffleCost
with scalable vector. The cost model might not the best.

For scalable vector, BasicTTIImpl::getShuffleCost return invalid cost,
so this patch relies on the existing cost model in BasicTTIImpl.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D124101

2022-04-29 13:28:02 +08:00

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