More on memory barriers

[Geoffrey Keating]

On 14/09/2004, at 2:25 PM, Jason Merrill wrote:

> Or is it the case on all of these targets that using a more heavyweight
> barrier (i.e. sync on PPC) invalidates speculative loads on other
> processors?

It's certainly the case on PPC.

(I would suggest using 'sync' on the initialization path rather than 
having a 'lwsync' on both paths.  Even though 'sync' is more expensive, 
I would expect that the non-initialization path will be much more 
common.)

-- 
Geoff Keating <geoffk@apple.com>

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