| Opcode | Instruction | Op/En | 64-Bit Mode | Compat/Leg Mode | Description | | ---------------- | --------------- | ----- | ----------- | --------------- | ------------------------------- | | 0C ib | OR AL, imm8 | I | Valid | Valid | AL OR imm8. | | 0D iw | OR AX, imm16 | I | Valid | Valid | AX OR imm16. | | 0D id | OR EAX, imm32 | I | Valid | Valid | EAX OR imm32. | | REX.W + 0D id | OR RAX, imm32 | I | Valid | N.E. | RAX OR imm32 (sign-extended). | | 80 /1 ib | OR r/m8, imm8 | MI | Valid | Valid | r/m8 OR imm8. | | REX + 80 /1 ib | OR r/m8\*, imm8 | MI | Valid | N.E. | r/m8 OR imm8. | | 81 /1 iw | OR r/m16, imm16 | MI | Valid | Valid | r/m16 OR imm16. | | 81 /1 id | OR r/m32, imm32 | MI | Valid | Valid | r/m32 OR imm32. | | REX.W + 81 /1 id | OR r/m64, imm32 | MI | Valid | N.E. | r/m64 OR imm32 (sign-extended). | | 83 /1 ib | OR r/m16, imm8 | MI | Valid | Valid | r/m16 OR imm8 (sign-extended). | | 83 /1 ib | OR r/m32, imm8 | MI | Valid | Valid | r/m32 OR imm8 (sign-extended). | | REX.W + 83 /1 ib | OR r/m64, imm8 | MI | Valid | N.E. | r/m64 OR imm8 (sign-extended). | | 08 /r | OR r/m8, r8 | MR | Valid | Valid | r/m8 OR r8. | | REX + 08 /r | OR r/m8\*, r8\* | MR | Valid | N.E. | r/m8 OR r8. | | 09 /r | OR r/m16, r16 | MR | Valid | Valid | r/m16 OR r16. | | 09 /r | OR r/m32, r32 | MR | Valid | Valid | r/m32 OR r32. | | REX.W + 09 /r | OR r/m64, r64 | MR | Valid | N.E. | r/m64 OR r64. | | 0A /r | OR r8, r/m8 | RM | Valid | Valid | r8 OR r/m8. | | REX + 0A /r | OR r8\*, r/m8\* | RM | Valid | N.E. | r8 OR r/m8. | | 0B /r | OR r16, r/m16 | RM | Valid | Valid | r16 OR r/m16. | | 0B /r | OR r32, r/m32 | RM | Valid | Valid | r32 OR r/m32. | | REX.W + 0B /r | OR r64, r/m64 | RM | Valid | N.E. | r64 OR r/m64. | > \* In 64-bit mode, r/m8 can not be encoded to access the following byte registers if a REX prefix is used: AH, BH, CH, DH.