XOR_LOCK

LOGICAL I86 x86_64

XOR_LOCK is an instruction of the x86_64 architecture (x86 / x86-64 (covers 16/32/64-bit modes)), category LOGICAL. This page lists its 6 encoding forms, distinguished by opcode bytes: 30, 31, 80, 81, 82, 83.

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_XOR_LOCK_MEMb_IMMb_80r6
MEM0:rw:b IMM0:r:b
X86_LEGACY 80 /6 I86
XED_XOR_LOCK_MEMb_IMMb_82r6
MEM0:rw:b IMM0:r:b
X86_LEGACY 82 /6 I86
XED_XOR_LOCK_X86_LEGACY_ONEBYTE_30_776345
MEM0:rw:b REG0=GPR8_R():r
X86_LEGACY 30 /r I86
XED_XOR_LOCK_X86_LEGACY_ONEBYTE_31_385139
MEM0:rw:v REG0=GPRv_R():r
X86_LEGACY 31 /r I86
XED_XOR_LOCK_X86_LEGACY_ONEBYTE_81_913975
MEM0:rw:v IMM0:r:z
X86_LEGACY 81 /6 I86
XED_XOR_LOCK_X86_LEGACY_ONEBYTE_83_366897
MEM0:rw:v IMM0:r:b:i8
X86_LEGACY 83 /6 I86