Re: Dynamic loading progress

[Paul Eggert]

Daniel Colascione wrote:
> Can you really imagine a general-purpose machine with 128-bit words?

I don't have to imagine it.  I have one on my desk right now, running Ubuntu 
15.04 on a Xeon E3-1225.  If I take this program:

  __int128
  mulbig (long a, long b)
  {
    __int128 aa = a;
    return aa * b;
  }

and compile it with gcc -O2, I get the following machine instructions:

        mulbig:
                movq    %rdi, %rax
                imulq   %rsi
                ret

and this yields a 128-bit value with the mathematically-correct answer (integer 
overflow is not possible for this example).

Admittedly my desktop doesn't support 128-bit words as well as I'd like.  But 
the support should be good enough for Emacs (of course, it should be enabled 
only on platforms that have it).