value range propagation for _bitwise_ OR

[Adam D. Ruppe]

On Sun, Apr 11, 2010 at 10:00:41PM -0400, Steven Schveighoffer wrote:
> We are talking about range propagation, a function of the compiler, not a function of the compiled program.  Therefore, slower but more exact functions should be preferred, since they only affect the compile time.

I agree with this. While my solution has a certain beauty to it and is
fast, your solution accurately covers all the bases, whereas mine fails with
min > 1. I say we go with your's.

-- 
Adam D. Ruppe
http://arsdnet.net