value range propagation for _bitwise_ OR

"Jérôme M. Berger" jeberger at
Mon Apr 12 10:57:16 PDT 2010

Andrei Alexandrescu wrote:
> On 04/11/2010 09:18 PM, Adam D. Ruppe wrote:
>> 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.
> Agreed. Steve's solution is the best we have for unsigned numbers.
> Andrei
	Nope, not anymore...

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