Thats mostly true, but not 100%, eg the amount of optimisation may be less and code is less tested so may have more bugs, which matter at scale. There is quite

Thats mostly true, but not 100%, eg the amount of optimisation may be less and code is less tested so may have more bugs, which matter at scale. There is quite a lot of assembly code in open source stuff, there was a survey here for the arm64 porting https://wiki.linaro.org/LEG/Engineering/OPTIM/Assembly https://wiki.linaro.org/LEG/Engineering/OPTIM/Assembly although much should be removed... (the 64 bit port could be what Facebook is interested in and thats way less supported...)