[llvm] [LoopPeel] Peel last iteration to enable load widening (PR #173420)

[Guy David via llvm-commits]

guy-david wrote:

Another issue with unrolling is that does not necessarily place the sequence of loads of the next iteration next to the previous one, and there could be a complex control flow or instructions with memory effects that separate between them.

https://github.com/llvm/llvm-project/pull/173420