https://bugs.freedesktop.org/show_bug.cgi?id=96488

--- Comment #2 from Vedran Miletić <vedran@miletic.net> ---
(In reply to jano.vesely from comment #1)
> That's because global atomics are not implemented in LLVM backend (despite
> driver advertising the extensions).
> Shouldn't be too hard to them.

Are you sure the hardware has the necessary instructions? Tom Stellard
commented on #radeon back in November that implementing global atomics for
r600g will be very very difficult[1].

[1]
https://people.freedesktop.org/~cbrill/dri-log/index.php?date=2015-11-27&channel=radeon

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