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

It's actually adding 7 to the number and rounding down.

This has the desired effect of rounding up to the next multiple of 8. (Adding +8 instead of +7 would bump a value of 8 to 16.)