[PATCH] D91343: [InstCombine] Optimize away the unnecessary multi-use sign-extend

[Bhramar Vatsa via Phabricator via llvm-commits]

Bhramar.vatsa created this revision.
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C.f. https://bugs.llvm.org/show_bug.cgi?id=47765

Added a case for handling the sign-extend (Shl+AShr) for multiple uses, to optimize it away for an individual use, when the demanded bits aren't affected by sign-extend.


https://reviews.llvm.org/D91343

Files:
  llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
  llvm/test/Transforms/InstCombine/simplify-multiuse-demanded-bits-ashr.ll

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