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AMD features
* Leaf 0x8000 0019 L1 TLB 1G Identifiers
* Leaf 0x8000 001A Performance Optimization Identifiers
* Leaf 0x8000 001B Instruction Based Sampling Identifiers
AMD bugs (?)
* Figure out why leaf 0x8000001D L3 cache is half-size on e.g. Ryzen 5 1400
+ Most likely because the "max threads sharing" is half of the threads on
the physical die (i.e. there are *two* L3 caches on one physical chip)
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