XADD_LOCK

SEMAPHORE I486REAL x86_64

XADD_LOCK is an instruction of the x86_64 architecture (x86 / x86-64 (covers 16/32/64-bit modes)), category SEMAPHORE. This page lists its 2 encoding forms, distinguished by opcode bytes: C0, C1.

Each form below links to its full decode: the operand roles and where each one is encoded in the instruction, the flag and register effects, and any micro-op sequence authored for it.

XED_XADD_LOCK_X86_LEGACY_0F_C0_257934
MEM0:rw:b REG0=GPR8_R():rw
X86_LEGACY C0 /r I486REAL
XED_XADD_LOCK_X86_LEGACY_0F_C1_152382
MEM0:rw:v REG0=GPRv_R():rw
X86_LEGACY C1 /r I486REAL