LZCNT
REG0=GPRv_R():w:v MEM0:r:v
x86_64 X86_LEGACY LZCNT APX_F_LZCNT source: xed
XED_LZCNT_GPRv_MEMv_APX
Encoding
| encoding_kind | X86_LEGACY |
| opcode_bytes | F5 |
| opcode_map | ONEBYTE |
| mandatory_prefix | - |
| has_modrm | True |
| vex_l | 0 |
| requires_mode | long |
| attributes | DISP8_NO_SCALE |
| exception_class | APX-EVEX-INT |
| cpl | 3 |
| raw_encoding | EVV 0xF5 VNP MAP4 MOD[mm] MOD!=3 REG[rrr] RM[nnn] MODRM() ND=0 NF=0 VL128 mode64 NOEVSR ZEROING=0 EVAPX() |
Operands (2)
| # | Role | Kind | Class / Reg | Width | Access | Visibility | Encoded in |
|---|---|---|---|---|---|---|---|
| 0 | REG0 | REG | w | W | EXPLICIT | MODRM_REG | |
| 1 | MEM0 | 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.