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Re:A Complete Formal Semantics of x86-64 User-Level Instruct... by CalChris on Tuesday April 23, 2019 @07:10PM (#19733936)
Re:A Complete Formal Semantics of x86-64 User-Level Instruct... by fernly on Wednesday April 24, 2019 @12:01AM (#19735455)
Oh! That's the IBM Journal article! Hah, suck on that, IEEE.

Also, note, the formal description is claimed to be executable code (by an APL interpreter).