[Libre-soc-bugs] [Bug 238] POWER Compressed Formal Standard writeup

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Wed Nov 18 10:17:23 GMT 2020


--- Comment #28 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to cand from comment #27)
> Why would you need 8 bits to specify the order of four elements though? 4! =
> 24, which is representable in 5 bits. This does need a lookup table in hw,
> but surely those are fast and cheap at that size.

because it's not just specifying order, you can have swizzles that duplicate
some input elements and skip other elements.

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