[Libre-soc-isa] [Bug 933] prefix-code (like huffman code) decode/encode instructions

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Thu Sep 22 20:30:03 BST 2022


--- Comment #11 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #10)
> does this work at all if defined in terms of 16-bit groupings (4 hwords
> per 64bit reg) which elwidth overrides can drop down to 8bit or 4bit
> based on src and dest elwidth.
> only relevant if greater than 8-bit prefix code is common.

that doesn't really work, >4-bit codes are pretty common, the code size is
limited to 6-bits since the tree is a 64-bit value and 6 = log2(64).

afaict this is an instruction where elwid overrides don't really work.

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