@dysfun the instruction is doing the affine transformation step on the right hand page of my notes - the big matrix multiplication followed by vector addition step, mod 2.
Intel call it A*x+b, so A would be the 8x8 matrix, x is the input vector (b'[0-7] in my notes), b is the added vector (11000110 in AES).
it's mod 2 so the vector addition is just xor.
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