[Libre-soc-isa] [Bug 908] indexed remap needs defined behavior for out-of-bounds indexes

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=908

--- Comment #5 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Jacob Lifshay from comment #4)
> Trying to use shadow cancellation at all for predicting the shuffle or
> predicate for dynamic shuffles is imho a bad idea, they're dynamic
> specifically because they're likely change all the time. The huge number of
> pipeline flushes caused by mispredictions would kill performance (think 10x
> as slow).

dynamic shuffle isn't expected to be super fast (unlike static shuffles), it
*is* expected to be faster than a pipeline flush due to predicate/shuffle
misprediction every other element!

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