[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 #15 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Luke Kenneth Casson Leighton from comment #14)

> +56,ALU,OP_PCDEC,RA,RB,RC,RT,NONE,CR0,0
> +        elif regs == ['RA', 'RB', 'RC', 'RT', '', 'CR0']:  # pcdec

(CRout=CR0 is exclusively reserved for instructions that
 have an Rc=1 form.  stbcx/stwcx perform explicit CR0
 writing. the instruction should be *named* "pcdec." if
 permanently writing to CR0. yes it's... awkward.)

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