OR_LOCK

LOGICAL I86 x86_64

OR_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: 08, 09, 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_OR_LOCK_MEMb_IMMb_80r1
MEM0:rw:b IMM0:r:b:i8
X86_LEGACY 80 /1 I86
XED_OR_LOCK_MEMb_IMMb_82r1
MEM0:rw:b IMM0:r:b:i8
X86_LEGACY 82 /1 I86
XED_OR_LOCK_X86_LEGACY_ONEBYTE_08_62779
MEM0:rw:b REG0=GPR8_R():r
X86_LEGACY 08 /r I86
XED_OR_LOCK_X86_LEGACY_ONEBYTE_09_417050
MEM0:rw:v REG0=GPRv_R():r
X86_LEGACY 09 /r I86
XED_OR_LOCK_X86_LEGACY_ONEBYTE_81_62786
MEM0:rw:v IMM0:r:z
X86_LEGACY 81 /1 I86
XED_OR_LOCK_X86_LEGACY_ONEBYTE_83_64884
MEM0:rw:v IMM0:r:b:i8
X86_LEGACY 83 /1 I86