%eax만 0으로 채워지는 게 아니라
%rax가 다 0으로 채워지던데
이건 원래 그런거임?
https://stackoverflow.com/questions/11177137/why-do-x86-64-instructions-on-32-bit-registers-zero-the-upper-part-of-the-full-6
감사하오.
https://stackoverflow.com/questions/11177137/why-do-x86-64-instructions-on-32-bit-registers-zero-the-upper-part-of-the-full-6
감사하오.