Originally posted by carewolf
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The problem is that for the cases where it's not (e.g. the ones hard to tell by a machine) are also the ones where the compiler will have a hard time adding their own prefetches. (there are some special cases in HPC and such where the human can know special things)
it's branch prediction hints all over again in many ways, where a broad use is damage because programmers know their own program not as well as the cpu does ;-)
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