[Libre-soc-bugs] [Bug 238] POWER Compressed Formal Standard writeup

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Mon Nov 30 01:06:42 GMT 2020


--- Comment #100 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #98)

> The proposed instructions there are an initial guess, IIRC we plan to
> rearrange/modify the supported compressed instructions to actually follow
> the observed instruction statistics. as part of that, `mr` is highly likely
> to be included in the final instruction set.

i couldn't get it into 10bit without compromising 10bit.

in theory... *sigh* one of the operations (further down the priority such as
nor) could be taken off the list in 10bit mode:

    if Cmajor.minor = ABC:
        if 10bit:
             OP = MR
             OP = NOR

which is...  bleugh to say the least but the idea is, as jacob said, to
prioritise by way of statistical analysis.

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