[Libre-soc-isa] [Bug 1087] change pseudocode to prevent output register write only when causing a fp trap and output is in same regfile as input

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1087

--- Comment #32 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #29)

> which part can i not do? the part with the current semantics which i
> thoroughly dislike with reading RT? or the part with changing the pseudocode
> to always write RT which I think is the best option overall?

neither.  just mention in the english language of the spec page

   "on a FP exception, RT is UNDEFINED.  Additionally, if Rc=1,
    CR0.SO is set to 1, all other bits of CR0 are UNDEFINED"

and don't touch CR0 in the psuedocode at all.

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