Index

ORR (immediate)

Bitwise OR (immediate) performs a bitwise (inclusive) OR of a register value and an immediate register value, and writes the result to the destination register.

This instruction is used by the alias MOV (bitmask immediate).

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
sf 0 1 1 0 0 1 0 0 N immr imms Rn Rd
opc

32-bit (sf == 0 && N == 0)

ORR <Wd|WSP>, <Wn>, #<imm>

64-bit (sf == 1)

ORR <Xd|SP>, <Xn>, #<imm>

integer d = UInt(Rd);
integer n = UInt(Rn);
constant integer datasize = 32 << UInt(sf);
bits(datasize) imm;
if sf == '0' && N != '0' then UNDEFINED;
(imm, -) = DecodeBitMasks(N, imms, immr, TRUE, datasize);

Assembler Symbols

<Wd|WSP>

Is the 32-bit name of the destination general-purpose register or stack pointer, encoded in the "Rd" field.
<Wn>

Is the 32-bit name of the general-purpose source register, encoded in the "Rn" field.
<Xd|SP>

Is the 64-bit name of the destination general-purpose register or stack pointer, encoded in the "Rd" field.
<Xn>

Is the 64-bit name of the general-purpose source register, encoded in the "Rn" field.
<imm>

For the 32-bit variant: is the bitmask immediate, encoded in "imms:immr".

For the 64-bit variant: is the bitmask immediate, encoded in "N:imms:immr".

Alias Conditions

Alias Is preferred when
MOV (bitmask immediate) Rn == '11111' && ! MoveWidePreferred(sf, N, imms, immr)

Operation

bits(datasize) result;
bits(datasize) operand1 = X[n, datasize];

result = operand1 OR imm;
if d == 31 then
    SP[] = ZeroExtend(result, 64);
else
    X[d, datasize] = result;

Operational information

If PSTATE.DIT is 1: