Using SSE to make four calculations in parallel

[Jez]

I was thinking of using GMP for a fractal program. From reading the docs, I
gather that SSE isn't used very extensively in GMP because the instructions
aren't really suited for the problem. However, it would be great if I could
get GMP to do four different calculations in parallel via SSE registers. Is
this functionality currently available? Would it be difficult to hack up
this feature?