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Consider adding Default to Module in dsl.py #197

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RobertBaruch opened this issue Sep 8, 2019 · 5 comments
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Consider adding Default to Module in dsl.py #197

RobertBaruch opened this issue Sep 8, 2019 · 5 comments
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feature
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0.1

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@RobertBaruch
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It seems to be more consistent with most other commonly-known languages to have the syntax for a default case look like this:

with m.Switch(thing):
  with m.Case(1):
    ...
  with m.Case(2):
    ...
  with m.Default():
    ...

than this:

with m.Switch(thing):
  with m.Case(1):
    ...
  with m.Case(2):
    ...
  with m.Case("default"):
    ...
@whitequark
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Hm, makes sense.

@whitequark
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Actually, hang on.

with m.Case("default"): is not valid in nMigen (this seems to be a mix of syntax from oMigen and nMigen), what you can do is with m.Case():.

@programmerjake
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if with m.Case(): is going to be the way to get a default case, that needs to be documented somewhere, I was not aware that nmigen supported default cases at all.

I personally prefer having a separate Default function, since that is more explicit.

@whitequark
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I think having a Default() function as an alias for Case() is fine.

@whitequark whitequark added this to the 0.1 milestone Sep 8, 2019
@RobertBaruch
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Ah, ok. I had a suspicion that default wasn't actually supported in nMigen (since I couldn't find "default" in the source) so I fell back to the Migen docs. So now you fixed two issues :D

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@whitequark @RobertBaruch @programmerjake