Re: [myhdl-list] Unsupported list comprehension form

[Jock T. <tan...@gm...>]

Chris, thank you for your swift reply!

Speaking of boolean logic in Python, all() and any() seemed so well-placed
and pythonic to me, I just could not imagine they are not supported.

Thanks for the insight, I’ll continue struggling.

2016-01-15 13:04 GMT+10:00 Christopher Felton <chr...@gm...>:

> The code that is convertible is limited, not all Python
> constructs are supported.
>
> Your line of code (line 89):
>
>     im_cl[i].next = im_gl[i] | any([(im_gl[j-1] if j > 0 else i_c) &
> all(im_pl[j:i+1]) for j in range(i+1)])
>
> Will need to be implemented with loops and basic conditional.
> I am fairly sure "any" and "all" are not convertible.
>
> Refer to the manual to see what constructs are convertible:
>
> http://docs.myhdl.org/en/stable/manual/conversion.html#the-convertible-subset
>
> Regards,
> Chris
>
> On 1/14/16 8:56 PM, Jock Tanner wrote:
>
>> Hello!
>>
>> I’m a Python web developer and a bit of radio hobbyist, and as such
>> I’ve been playing with MyHDL for a couple of weeks. I’d like to
>> apologize in advance if I have got some basics completely wrong from the
>> start, because that’s pretty possible. But I’d like to get a bit of
>> a clarification, or even better, an advice, concerning an error I
>> recently stuck with.
>>
>> I’m trying to implement a carry-lookahead adder from
>> http://www.ece.lsu.edu/ee3755/2013f/cla.pdf, and that’s how I wrote a
>> carry generator part (from page 5):
>>
>>
>> https://bitbucket.org/jock-tanner/asceticore/src/e0dce2f822639b66a024fe2f53ef2bcc98e8d2f2/components/adder.py?at=master&fileviewer=file-view-default#adder.py-64:92
>>
>> The code simulates fine, but when I try to convert it to Verilog, the
>> error comes up:
>>
>> “myhdl.ConversionError: in file
>>
>> /home/tanner/workspace/pr043-asceticore/project/asceticore/components/adder.py,
>> line 89:
>>
>> Unsupported list comprehension form: should be [intbv()[n:] for i in
>> range(m)]â€
>> Since I wish to put this design into an FPGA (I haven’t got the board
>> yet, but definitely will), I consider the conversion part important. But
>> right now I’m clueless of what I have done wrong conversion-wise.
>> I’ve read the manual
>> (http://docs.myhdl.org/en/stable/manual/conversion.html), but it
>> didn’t get me any further.
>>
>> Any ideas about how I should rework my code? Sorry again for bothering
>> you with such small and (hopefully) trivial matters.
>>
>> JT
>>
>>
>>
>>
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