Re: GCC optimizes integer overflow: bug or feature?

[Marcin Dalecki <martin at dalecki dot de>]

On 2006-12-21, at 23:17, Robert Dewar wrote:

> > Marcin Dalecki:
> > Well actually it wouldn't "save the world". However adding an
> > op-code implementing: x eqeps y <=> |x - y| < epsilion, would be   
> > indeed helpful.
> > Maybe some m-f has already patented it, and that's the reason we   
> > don't see it
> > already done. But that's of course only me speculating.
>
> There would be nothing wrong in having such an operation, but
> it is not equality!

Of course I didn't think about a substitute for ==. Not! However I think
that checks for |x-y| < epsilion, could be really given a significant  
speed edge
if done in a single go in hardware.