[PATCH] D89067: [InstCombine] visitTrunc - trunc(shl(X, C)) --> shl(trunc(X),trunc(C)) vector support

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, lebedev.ri.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.
RKSimon requested review of this revision.

Annoyingly vectors aren't supported by shouldChangeType(), but we have precedents for always performing this on vector types (e.g. narrowBinOp)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D89067

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
  llvm/test/Transforms/InstCombine/shift-amount-reassociation-in-bittest-with-truncation-shl.ll
  llvm/test/Transforms/InstCombine/shift-amount-reassociation-with-truncation-shl.ll
  llvm/test/Transforms/InstCombine/trunc.ll

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