orn

Vector Bitwise OR NOT

ORN <Vd>.<T>, <Vn>.<T>, <Vm>.<T>

ORs Vd with NOT of Vm.

Details

Performs a bitwise OR NOT operation on SIMD vector elements: each bit in Vd is set to (Vn | ~Vm). This is a bitwise logical operation that operates independently on each bit across all lanes. No condition flags are affected. Executes in AArch64 state with NEON extension; operates on both 64-bit (Q=0) and 128-bit (Q=1) vector registers.

Pseudocode Operation

for i = 0 to (datasize / 8) - 1
  Vd[i*8 +: 8] ← Vn[i*8 +: 8] | ~Vm[i*8 +: 8]

Example

ORN v0.4s.T, v1.4s.T, v2.4s.T

Encoding

Binary Layout
0
Q
0
01110
11
1
Rm
00011
1
Rn
Rd
 
Format SIMD Three Register
Opcode 0x0EE01C00
Extension NEON (SIMD)

Operands

  • Vd
    Destination SIMD/FP vector register
  • Vn
    First source SIMD/FP vector register
  • Vm
    Second source SIMD/FP vector register

Reference (Arm A64 ISA)

Instruction Forms

Encoding Instruction ISA Bit pattern
0x0EE01C00 ORN <Vd>.<T>, <Vn>.<T>, <Vm>.<T> A64 0 | Q | 0 | 01110 | 11 | 1 | Rm | 00011 | 1 | Rn | Rd
0x2A200000 ORN <Wd>, <Wn>, <Wm>{, <shift> #<amount>} A64 0 | 01 | 01010 | shift | 1 | Rm | imm6 | Rn | Rd
0xAA200000 ORN <Xd>, <Xn>, <Xm>{, <shift> #<amount>} A64 1 | 01 | 01010 | shift | 1 | Rm | imm6 | Rn | Rd
0x05000000 ORN <Zdn>.<T>, <Zdn>.<T>, #<const> A64 00000101 | 0 | 0 | 0000 | imm13 | Zdn
0x25804010 ORN <Pd>.B, <Pg>/Z, <Pn>.B, <Pm>.B A64 00100101 | 1 | 0 | 00 | Pm | 01 | Pg | 0 | Pn | 1 | Pd

Description

Bitwise inclusive OR NOT (vector). This instruction performs a bitwise OR NOT between the two source SIMD&FP registers, and writes the result to the destination SIMD&FP register. Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.

Operation

CheckFPAdvSIMDEnabled64();
bits(datasize) operand1 = V[n, datasize];
bits(datasize) operand2 = V[m, datasize];
bits(datasize) result;

operand2 = NOT(operand2);

result = operand1 OR operand2;

V[d, datasize] = result;