[Mesa-dev] [PATCH] Implement x86_64 atomics for compilers w/o intrinsics.

[tom fogal]

A friend of mine had trouble building 7.8.2 on an old gcc3.3 system
(no gcc intrinsics).  I put together this patch and he said his build
worked.  Our software doesn't thread so it's not really verified
otherwise.

I was a bit surprised we didn't need int64_t variants for x86_64.
Maybe that's needed in general, but just not in swrast / under Mesa w/
our particular option set?

Anyway, okay for 7.8 and master?

-tom

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