[PATCH] D103788: [InstCombine] Eliminate casts to optimize ctlz operation

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

If we look at the sequence with `trunc`, then preconditions are different.
I'm not sure if we have *some* problematic combination of src bitwidth and bitwidth increase,
but the hard cut-off that is currently there is not correct.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D103788/new/

https://reviews.llvm.org/D103788