[llvm] [InstCombine] Prefer to keep power-of-2 constants when combining ashr exact and slt/ult of a constant (PR #86111)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

The implementation LGTM. However, I don't see any performance improvement/regression according to the IR diff/instruction count. Can you provide some performance data for this patch? I guess it requires the zbs extension.


https://github.com/llvm/llvm-project/pull/86111