On Fri, Mar 27, 2026 at 07:48:38PM +0100, KAZAR Ayoub wrote: > I added a prescan loop inside the simd helpers trying to catch special > chars in sizeof(Vector8) characters, i measured how good is this at > reducing the overhead of starting simd and exiting at first vector: > the scalar loop is better than SIMD for one vector if it finds a special > character before 6th character, worst case is not a clean vector, where the > scalar loop needs 20 more cycles compared to SIMD. > This helps mitigate the case of JSON(B) in CSV format, this is why I only > added this for CSV case only.
Interesting.
> In a benchmark with 10M early SIMD exit like the JSONB case, the previous > 3% regression is gone.
While these are nice results, I think it's best that we target v20 for this patch so that we have more time to benchmark and explore edge cases.
Thanks for the review.
Fair enough, I'll try many more cases in the upcoming weeks to make sure we're not missing anything.
