[Libre-soc-bugs] [Bug 864] implement parallel prefix reduction in simulator

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=864

--- Comment #14 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #13)
> one thing that needs to be tested is an associative but not commutative
> function, fcpsgn is a good candidate (there aren't many that are single
> instructions). this ensures the order is correct.
> 
> you can also test a neither associative nor commutative function to ensure
> the tree is evaluated in the proper order, such as sub or andc.

hm good call on both counts.  manual inspection will
be needed because by using the same yield algorithm
it is risky.

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