[llvm] [InstCombine] Fold `umax/umin(nuw_shl(base, x), nuw_shl(base, y)) -> nuw_shl(base, umax/umin(x, y))` (PR #131076)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

Can we handle this in foldIntrinsicUsingDistributiveLaws instead? It currently assumes commutative ops, but if we drop that assumption we can handle the shift case there as well.

Note that while the transform is not valid for nsw + smin/smax, you *can* preserve the nsw flag for the unsigned case.

https://github.com/llvm/llvm-project/pull/131076