Matt Pharr 1bba9d4307 Improve atomic_swap_global() to take advantage of associativity. ...

We now do a single atomic hardware swap and then effectively do 
swaps between the running program instances such that the result
is the same as if they had happened to run a particular ordering
of hardware swaps themselves.

Also cleaned up __atomic_swap_uniform_* built-in implementations
to not take the mask, which they weren't using anyway.

Finishes Issue #56.

2012-01-20 10:37:33 -08:00

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