[PATCH] D115480: [InstCombine] Fold icmp of truncated left shift

[Sanjay Patel via Phabricator via llvm-commits]

spatel updated this revision to Diff 458032.
spatel added a comment.

Patch updated:

1. Added/removed/pre-committed tests.
2. Adjusted position of fold.

The diffs show that we can already fold some of these patterns via other transforms, but it is limited based on data type. That seems like an unnecessary restriction for this pattern since we can reduce to a single instruction (no one-use limits either). There are many TODO enhancements that can be done in follow-up patches.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D115480/new/

https://reviews.llvm.org/D115480

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
  llvm/test/Transforms/InstCombine/icmp-trunc.ll

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