[Libre-soc-bugs] [Bug 475] cxxsim improvements

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=475

--- Comment #11 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Cesar Strauss from comment #10)

> I hadn't tried compalu_multi. It does seem to be affected.

ok that's also good as it is way less code.

> 
> I had only tried alu_fsm.py, which is not affected.

which is even more interesting.

the likely candidate then, taking a wild guess, is the use of the latchregister
function.

this creates a mux with a loop that is guaranteed 100% not to ever become a
combinatorial loop however that requires manual analysis to verify.

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