This sounds like the same feature that Intel's C compiler used to "cripple AMD" by switching to a slower code path when it detected that the program was running

This sounds like the same feature that Intel's C compiler used to "cripple AMD" by switching to a slower code path when it detected that the program was running on a non-Intel CPU. https://www.agner.org/optimize/blog/read.php?i=49#49 https://www.agner.org/optimize/blog/read.php?i=49#49