Not sure how many bits of arithmetic are being assumed there, but
shift would also have a modulus effect. If I'm right, and if it's 32
bit, n << 21 might be like n mod 512 * 2^21.
I just made this:
http://staff.funnygarbage.com/colin/mapcalc.swf
It will let you play with values while you try to work out the relationships!
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