.LC0:
        .string "Knock, knock, %s\n"
.LC1:
        .string " Usage: %s <name> \n"
main:
        pushq   %rbp
        movq    %rsp, %rbp
        subq    $16, %rsp
        movl    %edi, -4(%rbp)
        movq    %rsi, -16(%rbp)
….L4:
        leave
        ret