[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 #14 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
ha! it works!

commit fff6d9ab2de5700103e0f9c1bb9fab64233f1783 (HEAD -> master)
Author: Luke Kenneth Casson Leighton <lkcl at lkcl.net>
Date:   Mon Oct 25 14:28:55 2021 +0100

    had to add fixed_width parameter temporarily to confirm that the
    minitest, test_partsig_scope.py, worked (which it did).
    now can work out how to remove it


now, the next incremental phases are:

1) work out how to remove the SimdScope.Signal(fixed_width) parameter
2) probably by creating a SimdShape(fixed_width=nnn)
3) which is passed in as the 1st parameter to SimdScope.Signal
4) which in the minitest makes it clear why rudimentary arithmetic
   is needed in SimdScope

        with SimdScope(self.m, elwid, vec_el_counts) as s:
            # BE CAREFUL with the fixed_width parameter.
            # it is NOT available in SimdScope.scalar mode
            self.a = s.Signal(fixed_width=width)
            self.b = s.Signal(fixed_width=width*2)
            self.o = s.Signal(fixed_width=width*3)

==>

        with SimdScope(self.m, elwid, vec_el_counts) as s:
            shape = s.Scope(fixed_width=width)
            self.a = s.Signal(shape)
            self.b = s.Signal(shape*2) # simple __mul__ needed
            self.o = s.Signal(shape*3) # again, simple __mul__ needed

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