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

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=238

--- Comment #146 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Alexandre Oliva from comment #144)
> thanks, I'll be very glad if the outcome of this question is that N without
> M is just a mistake in the tables.

yep looks that way to me.

>  There are occurrences of them in the
> 16-bit only tables under 2.1.6, 2.1.7 and 2.1.8.

yep, logical, fp, arith.  all cut/paste errors from... 8 days ago?

i've corrected them, please review?

> If it wasn't a mistake, 2.1.1 would probably have to have extra lines in the
> encoding formats table covering these cases of M-less Ns, and that would
> make for additional complexity in both phase 1 and phase 2 of the decoder.

yep, which i went to some trouble is distinctly undesirable in phase 1.

phase 2 not so bothered (ok if it gets hopelessly convoluted that's bad)

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