[libre-riscv-dev] [Bug 333] investigate why CR pipeline code took 100% CPU and locked up generating ILANG

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=333

--- Comment #31 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Michael Nolan from comment #30)
> (In reply to Luke Kenneth Casson Leighton from comment #26)
> > ls -altr
> > 
> >       90820 May 21 20:27 cr_pipeline.il
> > 
> > WOW.  down from 600k to 90k.
> > 
> > absolutely massive difference.
> 
> Gates are down too, from 2186 to 818

superb.  i don't believe we switched one problem for another: the
Condition Regfile can be designed in a manageable fashion, not
involving accidental creation of massive crossbars.

> Finally managed to get the CR proof working by leaving the original proof
> bits intact, and adding machinery to select the cr inputs and combine it
> back into the outputs.

eek :)

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