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Re: [Patch] Use __GCC_HAVE_SYNC_COMPARE_AND_SWAP_*

Paolo Carlini wrote:
Peter Dimov wrote:

There is an alternative; supply the __sync_..._{1,2,4,8} functions
(as weak symbols maybe?) for i386 and similar targets, implemented
with a spinlock pool, as suggested in N2145. This will have the
advantage of making user code "just work". One downside would be
that some users may not realize that they're getting an emulation.


I see. In fact, as you may remember, I have been asking for an
infrastructure providing an emulation layer transparent to the users
for *years*...

I understand, but isn't the infrastructure now almost in place? The compiler support is present; is it not just the library support that is missing?

Now, mid of 2007, with x86_64 becoming more and more
common and old Sparcs less and less common, I'm not sure the effort
still makes sense...

I wish I could share your optimism. :-) Sadly, 386 is as rare as an architecture can be, and 486 is as common as possible, and yet we still have i386 as the default.

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