DEC
BINARY APX_F x86_64
DEC is an instruction of the x86_64 architecture (x86 / x86-64 (covers 16/32/64-bit modes)), category BINARY. This page lists its 18 encoding forms, distinguished by opcode bytes: 00, 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.
X86_DEC_X86_LEGACY_ONEBYTE_00_419659
r16
XED_DEC_GPR8i8_APX
REG0=GPR8_B():rw:b:i8
XED_DEC_GPR8i8_APX_N3
REG0=GPR8_B():rw:b:i8
XED_DEC_GPR8i8_GPR8i8_APX_N3
REG0=GPR8_N():w:b:i8 REG1=GPR8_B():r:b:i8
XED_DEC_GPR8i8_MEMi8_APX_N3
REG0=GPR8_N():w:b:i8 MEM0:r:b:i8
XED_DEC_GPRv_48
REG0=GPRv_SB():rw
XED_DEC_GPRv_APX
REG0=GPRv_B():rw:v
XED_DEC_GPRv_APX_N3
REG0=GPRv_B():rw:v
XED_DEC_GPRv_FFr1
REG0=GPRv_B():rw
XED_DEC_GPRv_GPRv_APX_N3
REG0=GPRv_N():w:v REG1=GPRv_B():r:v
XED_DEC_GPRv_MEMv_APX_N3
REG0=GPRv_N():w:v MEM0:r:v
XED_DEC_MEMi8_APX
MEM0:rw:b:i8
XED_DEC_MEMi8_APX_N3
MEM0:rw:b:i8
XED_DEC_MEMv_APX
MEM0:rw:v
XED_DEC_MEMv_APX_N3
MEM0:rw:v
XED_DEC_X86_LEGACY_ONEBYTE_FE_527058
REG0=GPR8_B():rw
XED_DEC_X86_LEGACY_ONEBYTE_FE_565804
MEM0:rw:b
XED_DEC_X86_LEGACY_ONEBYTE_FF_828714
MEM0:rw:v