[PATCH] D25913: [InstCombine] Fold nuw left-shifts in `ugt`/`ule` comparisons.

[bryant via llvm-commits]

bryant updated this revision to Diff 75939.
bryant added a comment.

- replaced non-zero check for c with note in comments.
- added derivation of ult case in comments.
- use `icmp-shl-nuw.ll` instead of `icmp-shl-zext-simplify.ll`
- added non-zero constant vector and non-pow2 shift test cases.


Repository:
  rL LLVM

https://reviews.llvm.org/D25913

Files:
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/icmp-shl-nuw.ll

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