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That's not quite true, though. While there are no singular undefined instructions, there are sequences of instructions that can result in undesired/undefined be
by cpgxiii 2y ago
That's not quite true, though. While there are no singular undefined instructions, there are sequences of instructions that can result in undesired/undefined behavior. Read through the published errata for modern CPUs, there will be a large number of combinations of instructions/actions that should be avoided entirely or modified to avoid misbehavior.
- eqvinox 2y ago> Read through the published errata for modern CPUs I totally agree, and this entire HN post is about the fact that these Intel CPUs probably have some yet-undiscovered erratas. Best theory at this point is that it's power/thermal related though. > there will be a large number of combinations of instructions/actions that should be avoided As a matter of fact, reading those erratas is part of my job, and no, it is very rare for such erratas to have the effect you're implying. Rare enough that this issue that is seen here would already have been matched against an errata. I don't see anything in Intel's current errata — other than their in-progress responses to these reports — that could explain this. Here's the errata sheet for 13th/14th gen: https://edc.intel.com/content/www/us/en/design/products/platforms/details/raptor-lake-s/13th-generation-core-processor-specification-update/summary-tables-of-changes/ https://edc.intel.com/content/www/us/en/design/products/plat... … do you see anything?