Introduction to x64 Assembly

Re:Introduction to x64 Assembly by eliben on Friday April 05, 2013 @12:12PM (#5499276)

Once you get used to AT&T syntax, Intel's seems somewhat verbose. That said, deciphering complex addressing modes (especially for LEAs) in AT&T is pain. So each syntax and its quirks...

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Re:Introduction to x64 Assembly by adr_ on Monday April 08, 2013 @06:56AM (#5510977)

I wouldn't call it more verbose.

AT&T:

    sub    $0x8,%rbx
    callq  *%rax
    mov    (%rbx),%rax

Intel:

    sub    rbx, 0x8
    call   rax
    mov    rax, [rbx]

Intel can be written with:

    mov    rax, QWORD PTR [rbx]

But it's redundant and assemblers don't expect it. It's only necessary in a handful of places to avoid ambiguity, as opposed to the incessant size suffixes and $/% prefixes, which make AT&T feel more verbose to me. Definitely a matter of familiarity, though.

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