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

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Sun Nov 22 20:46:06 GMT 2020


--- Comment #59 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Luke Kenneth Casson Leighton from comment #58)

> might hold the 8-bit nop-ish insn to switch to 16-bit mode, since that's
> where the EXT bits are.

ahh.. ahh... ah ha! this is a great idea.  allow 16bit instructions to sit on
*byte* boundaries, flip into 16bit mode with an 8 bit indicator, being the byte
containing the v3.0B Major Opcode.

what's really nice about this is: actually you only need the one v3.0B Major

also if there are any circumstances where only 8bit encodings would suffice
these can be used to switch modes (within the 16 bit space).

i like it.  lots of possibilities to think through, here.

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