[PATCH] D122891: [X86] Fold AND(SRL(X,Y),1) -> SETCC(BT(X,Y))

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In D122891#3424712 <https://reviews.llvm.org/D122891#3424712>, @lebedev.ri wrote:

> What about the case where we want to have the inverse of the bit, https://godbolt.org/z/sEjq9n9Kn
> I would presume we can consume any such `not` by inverting the predicate (`b`<->`nb`).

np - we already do something like that in some of the other X86ISD::BT lowering cases - I'll take a look next week


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D122891/new/

https://reviews.llvm.org/D122891