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atomic: Add atomic_cmpset_masked to powerpc and use it
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Authored by jhibbits on Nov 14 2019, 4:35 AM.
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Summary

This is a more optimal way of doing atomic_compset_masked() than the
fallback in sys/_atomic_subword.h. There's also an override for
_atomic_fcmpset_masked_word(), which may or may not be necessary, and is
unused for powerpc.

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rS FreeBSD src repository - subversion
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