RE: [sv-cc] vpiReg and vpiLogic

Tapati,

We did have a big discussion about this, and our conclusions
are contained in part in the expanded Note 19 of
"32.14 Variables", which is in the version, I believe,
circulated for the first ballot.

In this case, yes, the application developer should
rewrite the code.  But there is a catch:  Note 19
deliberately allows a simulation product to return
different values for vpi_get_str(vpiReg, ...).  So
it can depend on which simulator you're using, or
on a command line switch in a particular
simulator, or even, strictly speaking, on the time
of day.

An application that wants to run both with a SystemVerilog
simulator and a plain old vanilla Verilog simulator
may need to conditionalize its code with something
like

  #ifdef vpiLogicVar

Note that similar conflicts occur for vpiVarBit vs.
vpiRegBit and for vpiArrayVar vs. vpiRegArray.

Regards,
Jim V.

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

] -----Original Message-----
] From: owner-sv-cc@eda.org [mailto:owner-sv-cc@eda.org] On 
] Behalf Of Tapati Basu
] Sent: Friday, May 27, 2005 5:30 PM
] To: sv-cc@eda.org
] Cc: Tapati.Basu@synopsys.com
] Subject: [sv-cc] vpiReg and vpiLogic
] 
] 
] Hi,
] 
] I just noticed that we are now treating vpiRegVar and 
] vpiLogicVar the same way.
] That means both of them will be the same constant in the 
] header file. Now what 
] happens if user has this code already for SV ? 
] 
] case vpiReg : 
]      printf( vpiReg)
]      
] case vpiLogic : 
]      printf(vpiLogic)
]      
]    
] We will get a duplicate case error here. Do we suggest them 
] to just change 
] their code ? 
] 
] 
] What is our decison, by default what should 
] vpi_get_str(vpiType..) will give 
] for logic/reg handle ? Should it be vpiLogic or vpiReg ? 
] 
] - Regards,
] Tapati 
] 
] 
]