[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 #1 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
two key commits, here:

1)
https://git.libre-soc.org/?p=ieee754fpu.git;a=commitdiff;h=cd06267946b1488104ddc2a5960f6b7002f322ec

 a) removing simd_full_width_hint because it's down to individual
    Signals (SimdSignals) to determine and explicitly set - if
    needed - their explicit width
 b) adding a module context.
    this is REALLY important.  firstly that the Type 1 (AST) casting
    rules for the module need to be declared as "Simd-aware"
    secondly that every single SimdSignal created must know what its
    module is, in order for it to be capable of creating sub-modules.

2)
https://git.libre-soc.org/?p=ieee754fpu.git;a=commitdiff;h=f1b7f195e21c3f7434a96520ebdb8484b696e54b

 a) added a docstring / bare-minimum usage

 b) added a Signal() function which either redirects to nmigen Signal
    or SimdSignal as appropriate

(2b) also shows - finally - in a concrete way - why SimdShape had to derive
from Shape.  unless it did so, there was no way that the SimdScope context
could transparently switch over between scalar and simd without one hell of
a lot of unnecessary futzing about

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