RE: [sv-cc] VPI interface of unsized literals

Hi Jim,

 

Thanks for replying and creating the enhancement request.

 

To add more support for my opinion, if the '1 is part of an expression that
includes a parameterized

operand the resulting size of the '1 may be different for different
instances. So, if you think about

vpiDecompile you need to be able to reproduce the original '1 and not the
expanded value. That's

why I believe this needs to be a new constant type.

 

Regards,

 

Jason

 

-----Original Message-----
From: Jim Vellenga [mailto:vellenga@cadence.com] 
Sent: Friday, October 24, 2008 3:13 PM
To: Jason Campbell; SV-CC
Subject: RE: [sv-cc] VPI interface of unsized literals

 

Jason,

 

To the best of my knowledge, the standard has not yet determined

how VPI should represent unbased, unsized literals.  I have used

your e-mail to file an Enhancement request in the committee's

data base.

 

At the present time, I would guess that most implementations

will represent it as a vpiConstant, but how they distinguish

that from other constants -- or even if they distinguish it

-- will be implementation-dependent.

 

I cannot speak on behalf of the whole committee, so the above is

just my opinion.

 

Regards,
Jim Vellenga

 

---------------------------------------------------------
James H. Vellenga                            978-262-6381
Software Architect                              (FAX) 978-262-6636
Cadence Design Systems, Inc.         vellenga@cadence.com
270 Billerica Rd
Chelmsford, MA 01824-4179
"We all work with partial information."
---------------------------------------------------------- 

 

 


  _____  


From: owner-sv-cc@eda.org [mailto:owner-sv-cc@eda.org] On Behalf Of Jason
Campbell
Sent: Friday, October 24, 2008 11:16 AM
To: 'SV-CC'
Subject: [sv-cc] VPI interface of unsized literals

Hi,

 

If I use '1 in an expression, what is the type of this constant returned by
VPI?

 

When I get the value is it 1 or does it expand to the appropriate size and
return 15

for example?

 

My opinion is that the type should be something like vpiUnsizedConstant and
the

return value should return only the single bit, 0, 1, z, x.

 

Thanks,

 

Jason Campbell


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