[PATCH] D68150: [InstCombine] Simplify shift-by-sext to shift-by-zext - ignore use count on sext

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri updated this revision to Diff 222236.
lebedev.ri edited the summary of this revision.
lebedev.ri added a comment.

Also perform sudo-CSE to avoid creating numerous `zext`s and leaving them up to the next time EarlyCSE.
This obviously doesn't help with pre-existing `zext`s..


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D68150/new/

https://reviews.llvm.org/D68150

Files:
  llvm/lib/Transforms/InstCombine/InstCombineInternal.h
  llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp
  llvm/test/Transforms/InstCombine/shift-by-signext.ll
  llvm/test/Transforms/PhaseOrdering/two-shifts-by-sext.ll

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