Absolute Value and Square Root implementations in fixed point

Small addition, if still useful.

I guess that if you want the magnitube of a 2's complement number and can accept the error of 1LSB you can simply invert the input number if the MSB is '1'.

This will cause an error, though.

The advantage is that you don't need an adder.

Example:

2's complement | decimal | magnitude | magnitude with error

0000 0 0 0

0001 1 1 1

...

0111 7 7 7

1000 -8 8 7

1001 -7 7 6

1010 -6 6 5

...

1111 -1 1 0

Hope it helps