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

I have added your clarification as a note to the original enhancement
request.
 
Certainly for decompiling we do need to reproduce the original.
 
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: Jason Campbell [mailto:jcampbell@winterlogic.com] 
	Sent: Friday, October 24, 2008 4:29 PM
	To: Jim Vellenga; 'SV-CC'
	Subject: 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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