[Libre-soc-isa] [Bug 937] instructions for bigint shift and prefix-code encode

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=937

--- Comment #24 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #23)
> for bigint shift, (as well as other useful stuff that needs dynamic
> shifting), we will want the equivalent of RVV's vslideup/vslidedown -- they
> shift a vector by a variable number of whole elements (dsld/dsrd handles
> shifts within elements).

svoffset. leave it in-place.  vslide* may be synthesised by applying
svoffset to a mv instruction.

alternatively using twin-predication the front (or back) of a predicate
can be set to zeros.

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