[PATCH] D45108: [InstCombine] Get rid of select of bittest (PR36950 / PR17564)

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri updated this revision to Diff 141152.
lebedev.ri added a comment.

- Refactored into a function
- Flattened the nesting
- Added some one-use checks
- Do not create `shl` if it is to be removed immediately.

FIXME: do we want to allow the shift amount to be a value (not a constant), too?


Repository:
  rL LLVM

https://reviews.llvm.org/D45108

Files:
  lib/Transforms/InstCombine/InstCombineSelect.cpp
  test/Transforms/InstCombine/select-of-bittest.ll

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