Are there any cycle-accurate or -reporting modern x86(-64)+SIMD emulators (thus, for specific microarchs) beside https://software.intel.com/en-us/articles/intel-architecture-code-analyzer …?
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It's probably *possible* to extract entropy out of clock phasing, but *depending* on it would be a lot more difficult.
E.g. you can configure a DLL to be "loose" enough that it drifts quite a lot. Also, clocks are often spread spectrum.