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Nathan Hjelm b2b58b31a2 Add support for 128-bit compare and swap on x86_64 when available.
A 128-bit compare-and-swap will enable a better atomic lifo implementation
that uses the pointer + counter method to avoid ABA issues. This commit
adds configury to check for the instruction (cmpxchg16b) and adds an
implementation that uses the __int128 type available in C99.
2014-12-04 08:53:28 -07:00
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