NOP
MEM0:r:v REG0=GPRv_B():r
x86_64 X86_LEGACY WIDENOP FAT_NOP source: xed
XED_NOP_MEMv_0F1F NOP_GPRv_0F1F
Encoding
| encoding_kind | X86_LEGACY |
| opcode_bytes | 1F 0F 1F |
| opcode_map | 0F |
| mandatory_prefix | - |
| has_modrm | True |
| attributes | NOP |
| cpl | 3 |
| raw_encoding | 0x0F 0x1F MOD[mm] MOD!=3 REG[rrr] RM[nnn] MODRM() 0x0F 0x1F MOD[0b11] MOD=3 REG[rrr] RM[nnn] |
Operands (2)
| # | Role | Kind | Class / Reg | Width | Access | Visibility | Encoded in |
|---|---|---|---|---|---|---|---|
| 0 | MEM0 | MEM | v | R | EXPLICIT | MODRM_RM | |
| 1 | REG0 | REG | R | EXPLICIT | MODRM_REG |
Micro-ops sequence (0)
No micro-ops authored for this encoding. Emulator semantics not yet defined — decoder still works.