775 B
775 B
| Opcode/Instruction | Op/En | 64-Bit Mode | Compat/Leg Mode | Description |
|---|---|---|---|---|
| 0F C7 /1 CMPXCHG8B m64 | M | Valid | Valid | Compare EDX:EAX with m64. If equal, set ZF and load ECX:EBX into m64. Else, clear ZF and load m64 into EDX:EAX. |
| REX.W + 0F C7 /1 CMPXCHG16B m128 | M | Valid | N.E. | Compare RDX:RAX with m128. If equal, set ZF and load RCX:RBX into m128. Else, clear ZF and load m128 into RDX:RAX. |