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Differential D23324

Add LSE-based atomic(9) implementations.
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Authored by markj on Jan 22 2020, 8:05 PM.
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arm64
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rS357459: Add LSE-based atomic(9) implementations.
Summary

These make use of the cas*, ld* and swp instructions added in ARMv8.1.
Testing shows them to be significantly more performant than LL/SC-based
implementations.

These were mostly written by Ali Saidi. I did atomic_testand*() and
made atomic_(set|clear|add|subtract)_* a bit simpler.

No functional change here since the wrappers still unconditionally
select the _llsc variants.

Submitted by: Ali Saidi <alisaidi@amazon.com> (original version)

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rS FreeBSD src repository - subversion
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sys/
arm64/
include/
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head/sys/arm64/include/atomic.h

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