RE: [sv-ec] Comments on 890-5.pdf

I think restricting the value non-negative signed expression is better.
If you treat the expression as unsigned, you will never see a negative
number, so your warning could never be issued.

> -----Original Message-----
> From: owner-sv-ec@server.eda.org [mailto:owner-sv-ec@server.eda.org]
On
> Behalf Of Jonathan Bromley
> Sent: Monday, February 12, 2007 2:36 PM
> To: stuart@sutherland-hdl.com; sv-ec@server.eda.org
> Subject: RE: [sv-ec] Comments on 890-5.pdf
> 
> Stuart,
> 
> > I agree that the LRM should standardize at least what ## does with a
> > negative value.  I also like option (c), treat as unsigned but issue
a
> > warning.
> 
> I'll raise a Mantis tomorrow unless anyone thinks it's too much of
> a distraction.
> 
> > Question: Should this only be a run-time warning,
> > or should the warning could be issued at the earliest
> > point it can be detected, which
> > might be compile, elaboration or run-time, depending on context?
> 
> I don't think it's necessary to stipulate that.  Runtime is obviously
> essential if it's not been caught previously, but any earlier time
> is always a value-add for users and I guess vendors will do that
> if it's practicable.
> 
> > Regarding # negative unit delays, I would prefer the standard
> > define the same behavior as ##, but anything we define could
> > have far reaching backward compatibility issues, since at least
> > two products took a radically different approach...
> 
> ... which means that there is nothing to be backwards-compatible
> with!  I'll raise it on the sv-bc reflector and see what happens.
> --
> Jonathan Bromley, Consultant
> 
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