Re: [sv-ec] Re: [P1800] IEEE P1800 Draft 8 Available for Download

Jim Lewis wrote:
> All,
>> From:
>>    Object stability can be achieved as long as object and thread creation
>>    and random number generation are done in the same order as before
>> To:
>>    Object stability shall be preserved when object and thread creation
>>    and random number generation are done in the same order as before
>>
> 
> Not having read the text preceding this so it may already be there,
> but these seem to be missing a requirement on what is
> preserving the order of creation - code or tool.

Both.  Given small "trailing" design perturbations, the tool is required
to preserve stability.  The user has the responsibility for not disturbing
the "leading" design components or behavior.  This is implied by the
full discussion in 18.14.1.

> It would seem to need to be:
>   Object stability shall be preserved for code that creates objects,
>   threads, and random numbers in the same order.
> 
> However, this does not address whether stability is maintained when the
> code creates additional objects, thread, or random numbers after
> the original objects.  Is it?

It is.  The sentence immediately after the one that I quoted is:

   In order to maintain random number stability, new objects, threads,
   and random numbers can be created after existing objects are created.

The overall stability requirements have been given a fair amount of
thought and have been made relatively robust.  "bind" for example, cannot
perturb object stability which is critically important.  We should take
any further discussion into just sv-ec since the general rules aren't
open for further change in this PAR unless there are ballot issues and
we're getting beyond the immediate issue of the IEEE's requested
editorial change that I was concerned about.

Gord.


> 
> Cheers,
> Jim Lewis
> SynthWorks _VHDL_ Training  :)
> 
> 

-- 
--------------------------------------------------------------------
Gordon Vreugdenhil                                503-685-0808
Model Technology (Mentor Graphics)                gordonv@model.com


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