Re: [boost] Proposal: Safe Double

From: Kevin Atkinson (kevinatk_at_[hidden])
Date: 2000-04-25 10:01:20

On Tue, 25 Apr 2000, Kevin Atkinson wrote:

> On Tue, 25 Apr 2000, Kevin Atkinson wrote:
> 
> >  SMALL_VAL can generally be fixed based on the type.
> 
> I take that back.  After thinking about it it would depond on the relative
> magnitude of what is being compared.  I guess you code would be the best
> thing to do although couldn't the equal case be defined something like
>   rhs.inf() == lhs.inf() 
> or
>   lhs.sup() == lhs.sup()
> Which will only involve 3 operations.
> 
> Another thing to do is to scale the values based on the exponent of either
> rhs or lhs.  However if the computer does not see this as a mere exponent
> change the performance results could be disastrous.
> 
> It seams like safe comparison should really be an operation of the
> FPU.....
> 
> 

-- 
Kevin Atkinson
kevinatk_at_[hidden]
http://metalab.unc.edu/kevina/