Need help with a circuit

From: Dark Alchemist (GhostOfACPast_at_gmail.com)
Date: 12/28/04 

Date: 28 Dec 2004 07:31:37 -0800

I need a circuit that can perform the following

if (x < -1)
x = 0
else if (x < 1)
x = sqrt(1 - (x^2))
else
x = 0

Now what I have done so far is the comparisons and have three
comparators so at a given x the appropiate values are given (1, -1, 0).
I have taken care of the square root, minus, and the square part as
well.

So, does anyone know what I use and how to do the if then else parts?
3 outputs and only one is needed at the input to the rest of the
circuit. I don't want a specialized ic for this so its just or, not,
and, xor, etc...

Thank you. :)

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