[Libre-soc-bugs] [Bug 583] Implement simple VL for-loop in nMigen for TestIssuer

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=583

--- Comment #43 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
i've also moved update_svstate and new_svstate into the issue FSM,
initialised new_svstate from cur_state, and also sync'd it *back*
into cur_state if update_svstate is set.

basically cur_state.svstate is a mini write-back cache where because
we are in the issue FSM there's nothing else that should be modifying
it for normal loops, but exceptions *will* cause it to change (and
loops end, then, back to Fetch).

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