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A comment on The x86 architecture is the weirdo (2004). Parent comment

Re:The x86 architecture is the weirdo (2004) by gpderetta on Tuesday April 19, 2022 @07:44PM (#31090858)
It is very inconsistent between major microarchitectural revisions, sometimes even between me minor steppings. Sometimes firmware updates can change the decoding (usually to fix bugs).
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Re:The x86 architecture is the weirdo (2004) by Jasper_ on Tuesday April 19, 2022 @11:26PM (#31092480)
The firmware can only do this by turning on an extremely slow fallback path. It's not common and it's seen as an avenue of last resort.
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