[PATCH] D158487: [PowerPC][altivec] Optimize codegen of vec_promote

[Kai Luo via Phabricator via cfe-commits]

lkail added a comment.

> but it might be a good idea to improve codegen for the insert which might be more common.

Yes. Usually `insertelement` is transformed to `BUILD_VECTOR` is SDAG, currently we don't have much optimization for `BUILD_VECTOR` in special patterns.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D158487/new/

https://reviews.llvm.org/D158487