Same, I'd write it out using modulo and would assume the compiler would figure it out. void *p = x; p += 7; p -= (p%8); Now that I've written it o

Same, I'd write it out using modulo and would assume the compiler would figure it out. void *p = x; p += 7; p -= (p%8); Now that I've written it out I suppose it's not any clearer than the mask method: void *p = x; p += 7; p &= ~7;