[Libre-soc-bugs] [Bug 1135] add FPSCR and Rounding classes to ieee754fpu

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1135

--- Comment #7 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #4)
> * hold off the write to the regfile until it is known
>   - if the exception has occurred (in which case "CANCEL WRITE" is raised)
>   - if there is NO CHANCE of the exception occurring
>     (in which case "DROP SHADOW" is raised)

I assumed that, i don't know how you got it into your head that I meant we
should rip that out.

according to my plan, fp ops will shadow until they know the sticky bits
haven't been changed and no fp traps are needed, at which point they drop the
shadow. if either of those are needed, then standard trap procedures are
followed, except that setting sticky bits is more like a branch misprediction
in that it just restarts the following insns instead of a trap where it changes
MSR and goes to e.g. PC=0x700.

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