Re: [myhdl-list] Slicing an unsigned intbv to a signed one

[Jan D. <ja...@ja...>]

Günter Dannoritzer wrote:

> Now that brings me back to think about the idea of an extra function 
> based on concat() that is convertible with toVerilog/VHDL. That would 
> not add extra code to intbv, but would allow to create an intbv instance 
> with bit slices and allow to manipulate the sign.

I would prefer to add a new method to intbv instead of a function in the
myhdl namespace. Adding a new function always feels a bit like a "defeat"
to me - when possible I prefer methods to keep namespaces clean and tie
operators to their type.

"concat" is a function because it has to work on several different types.

> So what about having a function like:
> 
>    concatSigned(sign, slice1, [slice2, ...[sliceN]..])
> 
> It will return an intbv by concatenating the slice(s) and setting the 
> sign based on the specified sign.

With the intbv.signed() method, this could be done as follows:

      concat(....).signed()

Jan

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