alt Hacker NewsVery cool! Also, huh interesting. I’ve used rdtsc to measure cycle diffs but had no idea its execution takes that long. Is that common across architectures?
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inigyou • today at 7:52 PM
AFAIK it acts as some kind of execution barrier, to give meaningful timing.
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The cycle count for RDTSC is ~25 cycles on Skylake-era microarchitectures. The 49 number shown in the OP seems off.