[PATCH] D52508: [InstCombine] Clean up after IndVarSimplify

[Dave Green via Phabricator via llvm-commits]

dmgreen updated this revision to Diff 169260.
dmgreen added a comment.

Whilst we're here, can anyone think of a good way to simplify:
(S + -32) - (-32 & (S + umax(31 - S, -32)))
That's the "do" case. I think if we distribute the -32& through the add, that with the rest of instcombine + cse + instcombine again does get us down to:
S & 31


https://reviews.llvm.org/D52508

Files:
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  test/Transforms/IndVarSimplify/replace-loop-exit-folds.ll
  test/Transforms/InstCombine/add-select.ll

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