NOP

REG0=GPRv_B():r REG1=GPRv_R():r REG0=GPRv_B():r REG1=GPRv_R():r REG0=GPRv_B():r MEM0:r:v REG0=GPRv_B():r MEM0:r:v

x86_64 X86_LEGACY WIDENOP PPRO source: xed

XED_NOP_GPRv_GPRv_0F1A NOP_GPRv_GPRv_0F1B NOP_GPRv_MEMv_0F1A NOP_GPRv_MEM_0F1B

Encoding

encoding_kindX86_LEGACY
opcode_bytes1A 0F 1B 0F 1A 0F 1B
opcode_map0F
mandatory_prefix-
has_modrmTrue
attributesNOP
cpl3
raw_encoding0x0F 0x1A MPXMODE=0 MOD[0b11] MOD=3 REG[rrr] RM[nnn] 0x0F 0x1B MPXMODE=0 MOD[0b11] MOD=3 REG[rrr] RM[nnn] 0x0F 0x1A MPXMODE=0 MOD[mm] MOD!=3 REG[rrr] RM[nnn] MODRM() 0x0F 0x1B MPXMODE=0 MOD[mm] MOD!=3 REG[rrr] RM[nnn] MODRM()

Operands (8)

# Role Kind Class / Reg Width Access Visibility Encoded in
0 REG0 REG R EXPLICIT MODRM_REG
1 REG1 REG R EXPLICIT MODRM_REG
2 REG2 REG R EXPLICIT MODRM_REG
3 REG3 REG R EXPLICIT MODRM_REG
4 REG4 REG R EXPLICIT MODRM_REG
5 MEM0 MEM v R EXPLICIT MODRM_RM
6 REG5 REG R EXPLICIT MODRM_REG
7 MEM1 MEM v R EXPLICIT MODRM_RM

Micro-ops sequence (0)

No micro-ops authored for this encoding. Emulator semantics not yet defined — decoder still works.