PCMPEQB
REG0=MMX_R():rw:q:i8 MEM0:r:q:i8 REG0=MMX_R():rw:q:i8 REG1=MMX_B():r:q:i8
x86_64 X86_LEGACY MMX PENTIUMMMX source: xed
XED_PCMPEQB_X86_LEGACY_0F_74_189841
Encoding
| encoding_kind | X86_LEGACY |
| opcode_bytes | 74 0F 74 |
| opcode_map | 0F |
| mandatory_prefix | - |
| has_modrm | True |
| attributes | NOTSX |
| exception_class | mmx-mem |
| cpl | 3 |
| raw_encoding | 0x0F 0x74 no_refining_prefix MOD[mm] MOD!=3 REG[rrr] RM[nnn] MODRM() 0x0F 0x74 no_refining_prefix MOD[0b11] MOD=3 REG[rrr] RM[nnn] |
Operands (4)
| # | Role | Kind | Class / Reg | Width | Access | Visibility | Encoded in |
|---|---|---|---|---|---|---|---|
| 0 | REG0 | REG | q | RW | EXPLICIT | MODRM_REG | |
| 1 | MEM0 | MEM | q | R | EXPLICIT | MODRM_RM | |
| 2 | REG1 | REG | q | RW | EXPLICIT | MODRM_REG | |
| 3 | REG2 | REG | q | R | EXPLICIT | MODRM_REG |
Micro-ops sequence (0)
No micro-ops authored for this encoding. Emulator semantics not yet defined — decoder still works.