[Libre-soc-isa] [Bug 213] SimpleV Standard writeup needed

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Thu Oct 8 20:38:13 BST 2020


--- Comment #39 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #37)
> (In reply to Luke Kenneth Casson Leighton from comment #33)
> > one thing though: i am really really leaning towards completely ignoring the
> > XER SO field for SV when it comes to CRs, and potentially giving that bit in
> > the CRs a new much more useful purpose.

If we use CRs for compare results, we still need the SO bit since it is used
for "unordered" for floating-point compares.

> i wonder if we should, in SV mode, use the CR SO bit as a predicate? and use
> the OE bit of instructions to say that "predication is to be enabled" or not.
> hmmm....

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