[PATCH] D31610: [InstCombine] Support folding add/and/or/xor with a constant vector RHS into selects

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.

Currently we only fold with ConstantInt RHS. This generalizes to any Constant RHS. Strangely we already got this right for subtract.

I don't have a test case for and because that tends to remove bits so I think SimplifyDemandedInstructionBits is taking care of merging it out.


https://reviews.llvm.org/D31610

Files:
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  test/Transforms/InstCombine/add.ll
  test/Transforms/InstCombine/or.ll
  test/Transforms/InstCombine/xor.ll

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