CMP
MEM0:r:b REG0=GPR8_R():r REG0=GPR8_B():r REG1=GPR8_R():r
x86_64 X86_LEGACY BINARY I86 source: xed
XED_CMP_GPR8_GPR8_38
Encoding
| encoding_kind | X86_LEGACY |
| opcode_bytes | 38 38 |
| opcode_map | ONEBYTE |
| mandatory_prefix | - |
| has_modrm | True |
| attributes | BYTEOP |
| cpl | 3 |
| raw_encoding | 0x38 MOD[mm] MOD!=3 REG[rrr] RM[nnn] MODRM() 0x38 MOD[0b11] MOD=3 REG[rrr] RM[nnn] |
Operands (4)
| # | Role | Kind | Class / Reg | Width | Access | Visibility | Encoded in |
|---|---|---|---|---|---|---|---|
| 0 | MEM0 | MEM | b | R | EXPLICIT | MODRM_RM | |
| 1 | REG0 | REG | R | EXPLICIT | MODRM_REG | ||
| 2 | REG1 | REG | R | EXPLICIT | MODRM_REG | ||
| 3 | REG2 | REG | R | EXPLICIT | MODRM_REG |
Flag effects (6)
CF = WRITE
PF = WRITE
AF = WRITE
ZF = WRITE
SF = WRITE
OF = WRITE
Micro-ops sequence (0)
No micro-ops authored for this encoding. Emulator semantics not yet defined — decoder still works.