Intel Erratum: COVFEFEby David Jones
Applies to 64-bit architecture and all steppings in the CHAOS REALM.
Chaos On oVerflow, FEFE.
The architectural CHAOS OVERFLOW flag is checked,
and if set, the literal
FEFE is combined with ELEMENTS OF CHAOS
using the current VECTOR CHAOS operation.
The result is copied to STATUS register, and to sporadic TLB
All in-flight instructions are terminated without retirement.
This is a privileged mode instruction and execution in user movfefe