[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 19:13:32 GMT 2020


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

--- Comment #130 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
alexander: ok, i added the FSM to the Appendix, along with a clear and
unequivocal separation between Phase 1 and Phase 2, explicitly stating
precisely and clearly what their roles and responsibilities are

https://libre-soc.org/openpower/sv/16_bit_compressed/

again to reiterate, i cannot emphasise enough how critically important it is
that you understand and accept the distinction between these two phases.

note in particular: ONLY phase 2 looks further at N/M to ascertain if the 16
bit instruction is the 16bit.immediate variant.

this is *NOT* relevant - at all - to Phase 1 because Phase 1's sole exclusive
task, to the exclusion of all else, is to determine length+mode, and to
communicate that to Phase 2, through a pipeline, in a fowarding-only fashion.

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