Load the initial tail non-atomically in ponyint_mpmcq_pop #1624
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This is a change originally suggested by @sylvanc in ponylang#1621. On x86, this results in less occurrences of the expensive cmpxchg16b instruction.
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This is a change originally suggested by @sylvanc in #1621. On x86, this results in less occurrences of the expensive cmpxchg16b instruction.