[PATCH] D105764: [InstCombine] Fold lshr/ashr(or(neg(x), x), bw-1) --> zext/sext(icmp_ne(x,0)) (PR50816)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon updated this revision to Diff 358244.
RKSimon retitled this revision from "[InstCombine] Fold ashr(or(neg(x),x),bw-1) --> sext(icmp_ne(x,0)) (PR50816)" to "[InstCombine] Fold lshr/ashr(or(neg(x),x),bw-1) --> zext/sext(icmp_ne(x,0)) (PR50816)".
RKSimon edited the summary of this revision.
RKSimon added a comment.

Use m_Deferred and add lshr(or(neg(x),x),bw-1) --> zext(icmp_ne(x,0))  handling


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D105764/new/

https://reviews.llvm.org/D105764

Files:
  llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp
  llvm/test/Transforms/InstCombine/sub-ashr-or-to-icmp-select.ll
  llvm/test/Transforms/InstCombine/sub-lshr-or-to-icmp-select.ll

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