[PATCH] D47428: [InstCombine] PR37603: low bit mask canonicalization

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

In https://reviews.llvm.org/D47428#1120886, @spatel wrote:

> In https://reviews.llvm.org/D47428#1120867, @lebedev.ri wrote:
>
> > I was just thinking about profitability of transform to `xor %x, -1`,
> >  and thought whether we could always do that if the input is `add %x, -1`.
> >
> > I can submit that fold as a follow-up.
>
>
> Sounds good. This patch LGTM.


Thank you for the review!
To not degrade x86 backend, this can't land until after https://reviews.llvm.org/D47453.


Repository:
  rL LLVM

https://reviews.llvm.org/D47428