[Libre-soc-bugs] [Bug 740] sync instruction incorrectly assigned to OP_NOP

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=740

--- Comment #2 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #1)
> we are copying microwatt verbatim.  microwatt caches are writethru.
> therefore sync is inherently a nop.

well, that only works on a single-core system. on a multi-core system, we also
need to wait for all in-progress load/stores, and execute a system-wide
synchronization of some sort (needed for supporting sequential-consistency
atomic thread fences).

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