Re: [myhdl-list] fixbv to current version of myhdl

[Jose M. G. C. <ch...@gm...>]

Dear Christopher,

I have given a quick glance to resize. Have you though on the possibility to use Decimal? It provides similar functionality for rounding, and allows to have a larger number of bits than float.

Best,

Jose M.

> El 02/05/2015, a las 20:01, Christopher Felton <chr...@gm...> escribió:
> 
>> On 5/2/15 11:27 AM, Henry Gomersall wrote:
>>> On 02/05/15 16:47, Christopher Felton wrote:
>>> On 5/2/15 8:55 AM, Edward Vidal wrote:
>>>>> Chris,
>>>>> Athttp://dev.myhdl.org/meps/mep-111.html
>>>>> Limitations no resize (function yet).
>>>>> Is this still true?
>>> There is a resize function but it is not convertible
>>> at this point.  I can make a convertible version but
>>> I didn't like how it worked out, been experimenting
>>> with other methods.  The existing resize function
>>> can be used for modeling and testing at this point.
>> 
>> How does it work?
> 
> Here is the `model` how I thought it should
> work:
> https://github.com/cfelton/myhdl/blob/mep111_fixbv/myhdl/_resize.py
> 
>> 
>> I've been playing with the routines in flopoco
>> (https://gforge.inria.fr/scm/?group_id=1030), which (among other nicely
>> portable tools) has a nice tool for resizing - actually it's a zero
>> counter and a shift left, so the essence of a resize.
> 
> I am not familiar with flopoco but someone else
> mentioned it on IRC as well.  I will look at it
> when I get a chance :)
> 
> Creating the resize for a given set of types isn't
> too difficult.  The difficulty is having a single
> resize function that can accept any type.
> 
>> 
>> It's the next thing I'm going to be implementing so it would be great to
>> combine effort on this. I'm not currently using fixbv, but a kind of
>> meta type of an intbv and a separate exponent.
> 
> The `fixbv` uses `intbv` as the base class.  There
> are multiple mailing-list conversations about the
> `fixbv`:
> 
> http://article.gmane.org/gmane.comp.python.myhdl/3242/match=fixbv
> http://article.gmane.org/gmane.comp.python.myhdl/3265/match=fixbv
> http://article.gmane.org/gmane.comp.python.myhdl/3385/match=fixbv
> http://article.gmane.org/gmane.comp.python.myhdl/3412/match=fixbv
> 
> (I see I didn't follow-up on your previous inquire
> into MEP111 and resize, doh:
> http://thread.gmane.org/gmane.comp.python.myhdl/3773/focus=3775 )
> 
> Regards,
> Chris
> 
> 
> 
> 
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