On Mon, Jun 27, 2022 at 10:23 PM Hannu Krosing <han...@google.com> wrote: > > > Another thought: for non-x86 platforms, the SIMD nodes degenerate to > > "simple loop", and looping over up to 32 elements is not great > > (although possibly okay). We could do binary search, but that has bad > > branch prediction. > > I am not sure that for relevant non-x86 platforms SIMD / vector > instructions would not be used (though it would be a good idea to > verify)
By that logic, we can also dispense with intrinsics on x86 because the compiler will autovectorize there too (if I understand your claim correctly). I'm not quite convinced of that in this case. > I would definitely test before assuming binary search is better. I wasn't very clear in my language, but I did reject binary search as having bad branch prediction. -- John Naylor EDB: http://www.enterprisedb.com
