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C/Assembly/연산

~cpp 
int i=123;
i-=4;

    movl    $123, -4(%ebp)
    leal    -4(%ebp), %eax
    subl    $4, (%eax)



나는
movl $123, -4(%ebp)
subl $4, -4(%ebp)
렇게 구는데 GNU Compiler는 %eax 그것 다.
그럴까?
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