[llvm] [LV] Pure runtime check for minimum profitable trip count. (PR #115833)

[David Sherwood via llvm-commits]

david-arm wrote:

Just for information I tried this patch out with the x264 benchmark on neoverse-v1 and it causes a ~2% performance regression. It looks like in the hot loop in `mc_chroma` we are not entering the tail-folded vector loop as often, and falling back on the scalar tail. I guess that means the min profitable trip count isn't quite right.

https://github.com/llvm/llvm-project/pull/115833