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SubjectRe: spin_unlock optimization(i386)

Manfred Spraul <> wrote:

> * you (speculatively) execute read instructions ahead of write
> instructions.
> * you do not send write instructions immediately out of the CPU core,
> they sit in a write buffer.

I'm starting to doubt myself a bit here (reads being hoisted above writes
with respect to externally observed stores vs. conflicts with the list of
uncommitted stores as being the trouble here), so I'm going to just check
on this one with the folks who implemented it here...

An answer will be forthcoming. Til then, have a good weekend all...

Erich Boleyn
PMD IA32 Architecture

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