Dot product

Single precision floating point.
System V AMD64 ABI convention.


sses_dot:
    movaps xmm0, [rdi]
    mulps xmm0, [rsi]
    haddps xmm0, xmm0
    haddps xmm0, xmm0
    ret

Also, to the ``lifthp faggots'' in this thread, does your Lisp compiler generate SSE SIMD instructions out of the box from regular code? I guarantee you that it does not.

Instead, you have to hack it in, and write your own XMM register allocator.

http://www.pvk.ca/Blog/Lisp/hacking_SSE_intrinsics-part_1.html