Using NEON in Raspberry Pi 4 64 Bits Bullseye

Hi there,

 

I'm using a raspberry pi 4 with the 64 bit image of Raspberry Pi OS, Bullseye based. I did the trick of manually changing the architecture to "aarch64-unknown-linux-gnu", but i've seen other tasks running in ARMv7 with architecture identified as "arm-unknown-linux-gnueabihf" and with NEON instructions. I assume these are 32 bit OS's running on raspberry pi's or something similar.

Does the 64 bit jobs use NEON instructions? If not, how could i enable them?

Also i'd would like to ask why i have so many invalid tasks? I know each task is sent to at least another user and if results differ, another computers will compute the same task till the output matches, but since i changed to 64 bits i have a lot more invalids than before. Right now i have 60 valid tasks and 15 invalid. Could it be a software issue or something wrong with my raspberry pi (OC, temperatures, etc)?