[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 #158 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #153)
> my feeling is that this should be perfectly legal i.e. ignore the fact that
> the v3.0B instruction is a 10bit, just go with it.

yeah, that should be legal.

I think the issue was detecting the case:
1. 16-bit compressed next=standard-then-compressed
2. 10-bit next=standard
3. what mode are we now?

I'm proposing the mode at 3 should either be compressed or 2 should trap
(trapping preferred).

The following case should be unquestionably legal:
1. 16-bit compressed next=standard-then-compressed
loop:
2. 10-bit next=compressed
3. 16-bit compressed next=...

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