RE: [sv-bc] RE: [sv-ac] New keywords in SV-AC proposals

Hi all,

Adding any new keyword brings potential backward compatibility problems.
I can just mention that introducing "priority" keyword required changing
our every second design, therefore this is feasible. As I can understand
from the feedback I saw, the most problematic keywords are "next" and
"free". The suggestion I prefer is to rename "next" to "nexttime", maybe
"free" can also be renamed into something like "nondet". I suggest we
discuss this at the next SV-AC meeting first, and then we can send the
new keywords to other committees for review.

Thanks,
Dmitry 

-----Original Message-----
From: owner-sv-ac@server.eda.org [mailto:owner-sv-ac@server.eda.org] On
Behalf Of Steven Sharp
Sent: Tuesday, March 11, 2008 10:52 PM
To: stuart@sutherland-hdl.com; sv-bc@server.eda.org;
sv-ec@server.eda.org; sv-cc@server.eda.org; sv-ac@server.eda.org
Subject: Re: [sv-bc] RE: [sv-ac] New keywords in SV-AC proposals


>From: "Stuart Sutherland" <stuart@sutherland-hdl.com>

>I am very concerned about some of the proposed new keywords,
specifically: 
>
>  checker, free, global, implies, let, next, restrict, strong, until,
weak
>
>These are common English words that are likely to be in use as
identifiers
>in existing code.

I have tried compiling a suite of 88 customer designs with these
keywords
reserved in our parser.  18 (or 20%) fail to compile.  This figure may
be
somewhat low, since some of these testcases appear to have been run
through
obfuscators before being given to us.

The offending keywords were:

next:		7 testcases
free:		7 testcases
global:		4 testcases
checker:	1 testcase
weak:		1 testcase

Note that the numbers do not add up to 18 testcases, because some
testcases
failed with conflicts on more than one keyword.

Also note that 'next' is particularly problematic, since it is already
used
as an identifier in a built-in method in SV.  One of these customer
tests
was SV and ran into this issue.

Steven Sharp
sharp@cadence.com


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