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Prefixes

The following prefixes can be used with 3DNow! instructions:

  • The segment override prefixes (2Eh/CS, 36h/SS, 3Eh/DS, 26h/ES, 64h/FS, and 65h/GS) affect 3DNow! instructions that contain a memory operand.

  • The address-size override prefix (67h) affects 3DNow! instructions that contain a memory operand.

  • The operand-size override prefix (66h) is ignored.

  • The LOCK prefix (F0h) triggers an invalid opcode exception (interrupt 6).

  • The REP prefixes (F3h/ REP/ REPE/ REPZ, F2h/ REPNE/ REPNZ) are ignored.

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