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@regehr Eventually, there's nowhere left to hide. For applications where you'd use say an ARM Cortex-M0 or a bare-bones minimal RV32I CPU, I'm not aware of anything x86 past or present that would really make sense.

Intel did "Quark" a while back which I believe was either a 486 or P5 derivative, so still something like a 5-stage pipelined integer core. If you want to go even lower than that, I don't think anyone has (or wants to do) anything.