[llvm] [InstCombine] Enable factorizeMinMaxTree for floating-point values (PR #193195)

[Nikita Popov via llvm-commits]

nikic wrote:

It's not immediately obvious to me that this is correct for minnum/maxnum, which are not trivially reassociable.

It would be good to implement the new minnum/maxnum semantics in alive2 before we add more folds for them.

https://github.com/llvm/llvm-project/pull/193195