Re: [myhdl-list] intbv with min -1, max 1 has 2 bits?

[Günter D. <dan...@we...>]

Jan Decaluwe wrote:
> Günter Dannoritzer wrote:
...
>> I might be oblivious and the reason is obvious, but I don't see it at 
>> the moment. Anyone can explain why I need a leading zero bit and cannot 
>> create a 1 bit intbv?
> 
> 1) why a leading zero bit
> Well, for a number that can be both positive or negative you need to
> have room for a sign bit, right? that's what the leading zero bit does.
> 
> 2) why not a 1 bit signed intbv
> That seems to be a bug. The one bit can function as a sign bit in
> this (corner) case. I guess the test should really be:
> 
>                  ...
>                  elif max <= 1: # not 0
>                      _nrbits = len(bin(min))
>                  ...

Thanks for the explanation.

> 
> 
> A sidenote: To get insight in this, I used the brand new web interface
> to the brand new mercurial repository at:
> 
>      http://myhdl.sourceforge.net/hg/myhdl
> 
> If you go to _intbv.py through "files", and then "annotate", you see the changeset
> when these lines were introduced. Click on it and then go to "changeset" to review
> that changeset. Great isn't it :-)

That feature is really great. What I haven't understood yet is, does 
sourceforge now support hg repositories or does hg export the repository 
as a bunch of html pages, so you can basically host that repository on 
any basic html page without extra software?

Is there a way to check the source out with hg?

Guenter