[PATCH] D45654: [InstCombine][NFC] Add tests for mask canonicalization in masked merge

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.

While this is NFC, i don't know if we do want to do this, so for now it's not a commit.

Masked merge has a pattern of: `((x ^ y) & M) ^ y`.
Once PR6773 <https://bugs.llvm.org/show_bug.cgi?id=6773> fold is done, that pattern will be produced.

But, if the mask is constant, there is no difference between `((x ^ y) & M) ^ y` and `((x ^ y) & ~M) ^ x` and `((x ^ y) & ~(~M)) ^ y`,
I think the constant mask should be canonicalized.


Repository:
  rL LLVM

https://reviews.llvm.org/D45654

Files:
  test/Transforms/InstCombine/invert-mask-in-masked-merge-scalar.ll
  test/Transforms/InstCombine/invert-mask-in-masked-merge-vector.ll

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