[PATCH] D116270: [AMDGPU] Enable divergence-driven XNOR selection

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

I guess this particular case could be handled by improving the v_perm matching in SITargetLowering::performOrCombine, e.g. add a cases for `or (op x, c1), c2 -> perm x, x, permute_mask(c1, c2)` and `or (perm x, x, c1), (op y, c2) -> perm x, y, permute_mask(c1, c2)`.


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  https://reviews.llvm.org/D116270/new/

https://reviews.llvm.org/D116270