[Libre-soc-isa] [Bug 1056] questions and feedback (v2) on OPF RFC ls010

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Fri Jun 2 01:11:35 BST 2023


--- Comment #46 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Paul Mackerras from comment #4)

> The RFC needs to be based on v3.1B rather than v3.0B (particularly since it
> depends on prefixed instructions).

ahhh... took me a while to think this through: strictly, it doesn't.
Prefixed-Prefixed 96-bit instructions are flat-out insane, so are
excluded.  we can't have sv.paddi or sv.pld.  and the SVP64 format
itself is independent of the Defined Word-Instruction.
[except for the annoying need to know the instruction category)
although obtuse even v2.0 or v1.0 could be SVP64-Prefixed!

a reason to update is down to wording, and what v3.1B contains.
the scalar RFCs i'll leave alone as there are 10+ of them and
it makes no odds: none of them are EXT1xx.

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