[PATCH] D68239: [InstCombine] dropRedundantMaskingOfLeftShiftInput(): propagate undef shift amounts

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri updated this revision to Diff 223232.
lebedev.ri retitled this revision from "[InstCombine] dropRedundantMaskingOfLeftShiftInput(): change how we deal with mask" to "[InstCombine] dropRedundantMaskingOfLeftShiftInput(): propagate undef shift amounts".
lebedev.ri edited the summary of this revision.
lebedev.ri added a comment.

Splitting into two patches.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D68239/new/

https://reviews.llvm.org/D68239

Files:
  llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp
  llvm/test/Transforms/InstCombine/partally-redundant-left-shift-input-masking-variant-a.ll
  llvm/test/Transforms/InstCombine/partally-redundant-left-shift-input-masking-variant-b.ll
  llvm/test/Transforms/InstCombine/partally-redundant-left-shift-input-masking-variant-c.ll
  llvm/test/Transforms/InstCombine/partally-redundant-left-shift-input-masking-variant-d.ll
  llvm/test/Transforms/InstCombine/partally-redundant-left-shift-input-masking-variant-e.ll

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