[PATCH] D117252: [InstCombine] Fold ashr-exact into a icmp-ugt.

[Nadav Rotem via Phabricator via llvm-commits]

nadav updated this revision to Diff 399871.
nadav added a comment.

@craig.topper thank you for the review. I removed the two predicated that are canonicalized before this method is called (ICMP_SGE and ICMP_UGE). I also used the script update_test_checks.py to update the check lines. I also verified with alive2 that the transformation is correct for ICMP_UGT, but only when the exact flag is present  (link:  https://alive2.llvm.org/ce/z/qBhxAM).


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D117252/new/

https://reviews.llvm.org/D117252

Files:
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/icmp-shr-lt-gt.ll
  test/Transforms/InstCombine/icmp-shr.ll

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