[Libre-soc-dev] we need two XLENs

Luke Kenneth Casson Leighton lkcl at lkcl.net
Fri Sep 9 01:52:14 BST 2022

On Fri, Sep 9, 2022 at 1:27 AM Jacob Lifshay <programmerjake at gmail.com> wrote:
> reading through this, it occurred to me that operations can have
> different source and destination elwidths, therefore just one XLEN
> variable isn't enough to express the full functionality required of
> scalar operations when svp64-prefixed.

yyeah i was hoping to avoid that: we'll find out soon enough
when implementing elwidths in the simulator.

what i *think* (hope) will happen is that results can be post-truncated
to DLEN, particularly as a post-analysis phase (saturate, CA, CA32).

thus - i *hope* - that XLEN is sufficient.


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