[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 #153 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Luke Kenneth Casson Leighton from comment #151)

> on that alone, "allow it" wins because even an illegal exception is extra
> gates.
> 
> but... is that good? i don't know.  thoughts?

wait.... this is what jacob was talking about, if you have a branch to the
10bit insn it should be "ok".  but, you might have an insn before it that is
16bit.

is that right jacob?

sequence:

    16bit sets next as: v3.0b-then-16
loop:
    EXT001=Compressed i.e. 10bit
    16bit whatevver

here there is no problem to jump to "loop" point, or to pass *through* loop
from the 16bit opcode *before* it.

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.

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