[PATCH] D122233: [AggressiveInstCombine] Add `shufflevector` instr support to `TruncInstCombine`

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

This might introduce regressions as the shuffle costs for the same mask but different element types can vary considerably (SSE v4i32/v4i16 unary shuffles are really cheap but v4i8 or v4i64 can be a lot more expensive).


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D122233/new/

https://reviews.llvm.org/D122233