Basic benchmark

[Walter Bright]

Jason House wrote:
> I have already hit long division related speed issues in my D code.
> Sometimes simple things can dominate a benchmark, but those same
> simple things can dominate user code too!

I completely agree, and I'm in the process of fixing the long division. 
My point was it has nothing to do with the code generator, and that 
drawing conclusions from a benchmark result can be tricky.