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AMD64 Technology 24594 Rev. 3.10 February 2005ORLogical ORPerforms a logical OR on the bits in a register, memory location, or immediate value(second operand) and a register or memory location (first operand) and stores theresult in the first operand location. The two operands cannot both be memorylocations.If both corresponding bits are 0, the corresponding bit of the result is 0; otherwise, thecorresponding result bit is 1.The forms of the OR instruction that write to memory support the LOCK prefix. Fordetails about the LOCK prefix, see “Lock Prefix” on page 10.Mnemonic Opcode DescriptionOR AL, imm8 0C ib OR the contents of AL with an immediate 8-bit value.OR AX, imm16 0D iw OR the contents of AX with an immediate 16-bit value.OR EAX, imm32 0D id OR the contents of EAX with an immediate 32-bit value.OR RAX, imm320D idOR reg/mem8, imm880 /1 ibOR reg/mem16, imm1681 /1 iwOR reg/mem32, imm3281 /1 idOR reg/mem64, imm3281 /1 idOR reg/mem16, imm883 /1 ibOR reg/mem32, imm883 /1 ibOR reg/mem64, imm883 /1 ibOR reg/mem8, reg8 08 /rOR the contents of RAX with a sign-extended immediate 32-bitvalue.OR the contents of an 8-bit register or memory operand and animmediate 8-bit value.OR the contents of a 16-bit register or memory operand and animmediate 16-bit value.OR the contents of a 32-bit register or memory operand and animmediate 32-bit value.OR the contents of a 64-bit register or memory operand andsign-extended immediate 32-bit value.OR the contents of a 16-bit register or memory operand and asign-extended immediate 8-bit value.OR the contents of a 32-bit register or memory operand and asign-extended immediate 8-bit value.OR the contents of a 64-bit register or memory operand and asign-extended immediate 8-bit value.OR the contents of an 8-bit register or memory operand with thecontents of an 8-bit register.216 OR
24594 Rev. 3.10 February 2005 AMD64 TechnologyMnemonic Opcode DescriptionOR reg/mem16, reg16 09 /rOR reg/mem32, reg32 09 /rOR reg/mem64, reg64 09 /rOR reg8, reg/mem8 0A /rOR reg16, reg/mem16 0B /rOR reg32, reg/mem32 0B /rOR reg64, reg/mem64 0B /rOR the contents of a 16-bit register or memory operand with thecontents of a 16-bit register.OR the contents of a 32-bit register or memory operand with thecontents of a 32-bit register.OR the contents of a 64-bit register or memory operand with thecontents of a 64-bit register.OR the contents of an 8-bit register with the contents of an 8-bitregister or memory operand.OR the contents of a 16-bit register with the contents of a 16-bitregister or memory operand.OR the contents of a 32-bit register with the contents of a 32-bitregister or memory operand.OR the contents of a 64-bit register with the contents of a 64-bitregister or memory operand.The following chart summarizes the effect of this instruction:X Y X OR Y0 0 00 1 11 0 11 1 1Related InstructionsAND, NEG, NOT, XOROR 217
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