jyknight added a comment. As I've mentioned before, depending on what this will be used for, "64" is not a _useful_ answer if you want to know how your memory accesses will behave on modern intel x86 CPUs, despite being the "correct" answer for cache-line size. But, modern intel CPUs fetch aligned-pairs of cache-lines together. Therefore, you'll start to see cache interference effects as-if the cache-lines were 128 bytes, rather than 64 bytes. (This may or may not also apply to AMD cpus, I haven't looked into it.)
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