I'm no lawyer, but my instincts tell me someone would have to prove that the chips today do not conform to Intel's specs, and that this difference is such that the CPU no longer "substantially conforms" to the spec.

> If an instruction does something different than what their specs say on occasion, do they take that to mean it's substantially conforming to their specs?

We're on the same page. What do you think Intel will argue?

Keep in mind Intel did initiate a substantial recall of Pentium CPUs in the late 90s: https://en.wikipedia.org/wiki/Pentium_FDIV_bug