[PATCH] D148440: [InstCombine] Fold zext(shl(trunc)) into and(shl)

[Kazu Hirata via Phabricator via llvm-commits]

kazu added a comment.

I missed the entire block of code in `InstCombinerImpl::visitZExt` to widen an expression tree:

  // Try to extend the entire expression tree to the wide destination type.                                            
  unsigned BitsToClear;
  if (shouldChangeType(SrcTy, DestTy) &&
      canEvaluateZExtd(Src, DestTy, BitsToClear, *this, &Zext)) {

Let me see if I could modify this block code to accommodate our trunc-shl-zext sequence.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D148440/new/

https://reviews.llvm.org/D148440