DEC_LOCK

BINARY I86 x86_64

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

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_DEC_LOCK_X86_LEGACY_ONEBYTE_FE_674536
MEM0:rw:b
X86_LEGACY FE /1 I86
XED_DEC_LOCK_X86_LEGACY_ONEBYTE_FF_728810
MEM0:rw:v
X86_LEGACY FF /1 I86