How prevalent are old x64 processors lacking the cmpxchg16b instruction?
Fresh3 days ago
Mar 15, 202611303 viewsConfidence Score0%
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Problem
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 for several years now. How likely am I to encounter a 64-bit machine with an old processor that lac…
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Fix for: How prevalent are old x64 processors lacking the cmpxchg16b instruction?
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You are looking at early AMD 64-bit processors, before Rev F (which is when they moved to DDR2 memory). There is some early stepping D Intel Noconas too that did not support it, I think, but these are rarer.
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