RFR: 8192123: Zero should use compiler built-ins for atomics on linux-arm

[Andrew Haley]

On 29/11/17 14:08, John Paul Adrian Glaubitz wrote:
> Since the compiler built-ins for cmpxchg() work exactly like the current ARM-specific
> implementation in Zero, there is no need anymore to carry our own implementation but
> rather rely on gcc which helps simplifying the code.
> 
> I have successfully tested this change in the following targets:
> 
> - Linux ARMv4T
> - Linux ARMv7
> 
> My change also removes a single empty line to make the formatting more
> consistent. Hope this is ok.

Hmm.  This doesn't fix a bug, and there's a non-zero probability of
introducing one.  I guess it should be OK, but this is a combination
of performance improvement (possibly) and cleanup.

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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