Bit Hack - Round off to multiple of 8

Question

can anyone please explain how this works (asz + 7) & ~7; It rounds off asz to the next higher multiple of 8.

It is easy to see that ~7 produces 11111000 (8bit repre

Answer 1

Uhh, you just answered your own question??? by adding 7, you are guaranteeing the result will be at or above the next multiple of 8. truncating then gives you that multiple.