[PATCH] D63004: [TargetLowering] Simplify (ctpop x) == 1

[Dávid Bolvanský via Phabricator via llvm-commits]

xbolva00 added a comment.

In D63004#1534364 <https://reviews.llvm.org/D63004#1534364>, @RKSimon wrote:

> We need to check other targets if we do this as a generic combine


Since we have already implemented tranformations in TargetLowering like:
// (ctpop x) u< 2 -> (x & x-1) == 0
// (ctpop x) u> 1 -> (x & x-1) != 0

I think I just should take this first version (was suggested in the comment) and go ahead with review...


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