On Wed, Sep 21, 2022 at 09:23:40AM -0700, Jim Mattson wrote: > AMD defined the 64-bit x86 extensions while Intel was distracted with > their VLIW science fair project. In this space, Intel produces AMD64 > compatible CPUs. Almost-compatible. And maybe, just maybe, because Intel were probably and practically forced to implement AMD64 but then thought, oh well, we'll do some things differently. > The definitive specification comes from AMD (which is sad, because > AMD's documentation is abysmal). Just don't tell me the SDM is better... But you and I are really talking past each other: there's nothing definitive about a spec if, while implementing it, the other vendor is doing some subtle, but very software visible things differently. I.e., the theory vs reality point I'm trying to get across. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette