Low-level programming language used to send instructions (machine code) directly to a microprocessor. For assembling hardware, use [computer-building] instead.

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How prevalent are old x64 processors lacking the cmpxchg16b instruction?

The cmpxchg16b instruction for doing atomic 128 bit memory exchanges is not supported on old versions of the x64 processor but it seems like this has been supported by newer versions of the processor ...