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

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=933

--- Comment #27 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
btw one thing to consider: using overwrite-variants (RT=src+dest).
this _has_ been done before (for ternlog[i])

@unique
class In3Sel(Enum):
    NONE = 0
    RS = 1
    RB = 2  # for shiftrot (M-Form)
    FRS = 3
    FRC = 4
    RC = 5  # for SVP64 bit-reverse LD/ST
    RT = 6  # for ternlog[i]

the VA-Form EXT004 locations are extremely precious: there had
better be a really good reason for using them, such as "chaining"
of "sv.pcdec/mr".

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