Re: [boost] Proposal: Safe Double

From: Kevin Atkinson (kevinatk_at_[hidden])
Date: 2000-04-25 09:46:34

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/