RE: [sv-bc] E-mail Ballot: Respond by 8AM PST, Mon, Dec 10, 2007

 

> >>SVDB 1345 _X_Yes   ___No
> >>http://www.eda.org/svdb/view.php?id=1345
> 
> I do think that 12.4.2 should say "after finding a true 
> condition" instead of "after finding a matching condition".  
> Can we make this a friendly amendment?
> 
> Case-statements look for matches, while if-statements look 
> for true (though that could be regarded as "matching" 
> non-zero).  The rest of this section refers to true 
> conditions.  I assume that this was just a copying error from 
> the case section.

OK, sounds right.

 
> I am also not sure that 12.4.2 should be saying "evaluate and compare"
> instead of just "evaluate".  This may have come in from the 
> case section also.  Yes, there is an implicit compare to 
> zero, but that is just the definition of whether the 
> condition is true or not, so I don't think it needs specific 
> mention.  It seems more likely to confuse than help.
> However, I acknowledge that it is not wrong.

I wrote it this way because 'evaluate' means to compute the value of a
condition without necessary looking at the result. 'compare' was
intended to mean 'look at the result and decide whether it means true or
false'.

 
> It is still possible that this text could be misinterpreted 
> as meaning that it executes the first true/matching statement 
> *of the subset that it evaluated before finding a violation*. 
>  However, it is hard to make it completely clear while 
> leaving the flexibility Gord requested.  Overall, I think 
> that the proposed text is quite good, and a definite improvement.

That is the reason that the statements

"The implementation shall issue a warning and execute the statement
associated with t
the true condition that appears first in the if statement, but not the
statements 
associated with other true conditions."

and

"The implementation shall issue a warning and execute the statement
associated with the matching case_item that appears first in the case
statement, but not the statements associated with other matching
case_items."

appear unconditionally before any mention of the short-circuiting.

Thanks,
Shalom
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