RE: [sv-bc] part selects on arbitrary expressions

Ignore the previous mail. The attachment had an error in the BNF.

Shalom 

> -----Original Message-----
> From: owner-sv-bc@server.eda.org 
> [mailto:owner-sv-bc@server.eda.org] On Behalf Of Bresticker, Shalom
> Sent: Wednesday, November 07, 2007 5:53 PM
> To: sv-bc@server.eda.org
> Subject: RE: [sv-bc] part selects on arbitrary expressions
> 
> Hi,
> 
> I have attached a proposal for bit-selects on part-selects on 
> concatenations.
> 
> Please review.
> 
> Thanks,
> Shalom
> 
> > -----Original Message-----
> > From: owner-sv-bc@server.eda.org
> > [mailto:owner-sv-bc@server.eda.org] On Behalf Of Bresticker, Shalom
> > Sent: Monday, November 05, 2007 5:20 AM
> > To: Brad Pierce; sv-bc@server.eda.org
> > Subject: RE: [sv-bc] part selects on arbitrary expressions
> > 
> > I have been thinking about this for a long time. I believe that the 
> > simplest thing to do and the way that has the best chance of being 
> > passed within the short time that we have is to define selects on 
> > concatenations. There is no ambiguity in that case. It has some 
> > limitations, you only have vectors, but I believe it would 
> still add a 
> > lot of usefulness.
> > 
> > Shalom
> > 
> > > -----Original Message-----
> > > From: owner-sv-bc@server.eda.org
> > > [mailto:owner-sv-bc@server.eda.org] On Behalf Of Brad Pierce
> > > Sent: Sunday, November 04, 2007 10:50 PM
> > > To: sv-bc@server.eda.org
> > > Subject: Re: [sv-bc] part selects on arbitrary expressions
> > > 
> > > Following up to http://www.eda-stds.org/sv-bc/hm/5506.html
> > , I, too,
> > > would like to see this enhancement (selects of arbitrary
> > primaries) in
> > > SV-2008.
> > >  
> > > In SV-2005, for any expression 'expr',  one can already declare
> > >  
> > >    var type(expr) temp;
> > >  
> > > and then write
> > >  
> > >    temp = expr;
> > >    ... temp[5] ...
> > >  
> > > But one ought to be able to simply write
> > >  
> > >    ... (expr)[5] ...
> > >  
> > > More generally, for any primary 'p', one ought to be able to write
> > >  
> > >    ... p[5] ...
> > >  
> > > Consider the defintion of static cast --
> > >  
> > >    "If the expression is assignment compatible with the
> > casting type,
> > > then the cast shall return the value that a variable of 
> the casting 
> > > type would hold after being assigned the expression."
> > >  
> > > We could come up with a similar rule that generalizes selects.
> > >  
> > > I don't think it's a strong argument against this
> > enhancement to say
> > > that the type() operator is not well enough defined, as noted in
> > > 
> > >          http://www.eda-stds.org/sv-bc/hm/7082.html
> > > 
> > > To me that is just an argument for clarifying the 
> definition of the
> > > type() operator.
> > >  
> > > -- Brad
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> Intel Israel (74) Limited
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