CMPXCHG8B
m64,
x86_64 X86_LEGACY SEMAPHORE CMPXCHG8B source: asmjit
X86_CMPXCHG8B_X86_LEGACY_0F_C7_298793
Encoding
| encoding_kind | X86_LEGACY |
| opcode_bytes | C7 |
| opcode_map | 0F |
| mandatory_prefix | - |
| has_modrm | True |
| modrm.reg = /1 | /1 |
| attributes | LOCK,XACQREL |
| raw_encoding | [OP] 0F C7 /1 |
Operands (1)
| # | Role | Kind | Class / Reg | Width | Access | Visibility | Encoded in |
|---|---|---|---|---|---|---|---|
| 0 | MEM0 | MEM | q | RW | EXPLICIT | MODRM_RM |
Flag effects (1)
ZF = WRITE
Micro-ops sequence (0)
No micro-ops authored for this encoding. Emulator semantics not yet defined — decoder still works.