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PUSH GS, POP GS and RSM (0F A8, 0F A9, 0F AA) have no ModRM byte, but fell in the 0F A3-AB ModRM range, so the decoder read the next byte as a ModRM and sized its displacement. MOV to and from control and debug registers (0F 20-23) ignore the ModRM mod field and always name a register, but were sized and reported as memory forms, including a RIP-relative disp32 for mod 00 r/m 101.