[Libre-soc-bugs] [Bug 734] add Partitioned SimdSignal support for elwidth-based layouts (currently ElwidPartType)

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=734

--- Comment #7 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
here is the relevant code section from PartitionedCat:

 110     for pbit in self.ptype.get_cases():
 111         # set up some indices pointing to where things have got
 112         # then when called below in the inner nested loop they give
 113         # the relevant sequential chunk
 114         output = []
 115         y = [0] * len(self.catlist)
 116         # get a list of the length of each partition run
 117         runlengths = get_runlengths(pbit, len(keys))
 118         print ("pbit", bin(pbit), "runs", runlengths)
 119         for i in runlengths: # for each partition
 120             for yidx in range(len(y)):
 121                 thing = self.get_chunk(y, yidx, i) # sequential chunks
 122                 output.append(thing)

the core of PartitionedCat is lines 119 and 120, which
create the Cat()ed result on a per-elwidth basis (line 110)
for every element (line 119) in the partition, where the
actual Cat on a per-element basis is the loop at line 120.

what is missing from this picture is the arbitrary sizes and occurrences
of padding blocks.

to that end, get_chunk needs to move into ElwidPartType, and it
needs to be possible to determine that the "things" being created
do not necessarily match perfectly with the expected width, and
to pad them.

still thinking it through

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