How do I perform a multiplication by 2 of the unsigned 32-bit quantity in registers
r18 is the most significant byte?
My answer is this:
rol r18; rol r19; rol r20; rol r21.
My thought process is that since this is an unsigned number, we can exclude the use of
ASL as there is no carry out in MSB. But I didn't get it right; may I know which part is wrong?