The arithmetic support of SCmode and DCmode.

[craig@jcb-sc.com]

>I completely agree :-)  Could someone summarize the current state
>of the implementation of operations on complex numbers? As far
>as I know currently EGCS has the quick and dirty implementation and
>for an accurate implementation we only need to fix the divide.
>
>Is that right?

Apparently we also need to implement square root, and in the meantime
get it to crash instead of generating wrong code.  (I mentioned that
to Toon in an earlier email.)

Also, I think it's reasonable to leave the quick-and-dirty complex divide
code in, and have it be used when -ffast-math.

        tq vm, (burley)