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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).

313029282726252423222120191817161514131211109876543210
sf01100100NimmrimmsRnRd
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);
integer datasize = if sf == '1' then 64 else 32;
bits(datasize) imm;
if sf == '0' && N != '0' then UNDEFINED;
(imm, -) = DecodeBitMasks(N, imms, immr, TRUE);

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

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

Operation

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

result = operand1 OR imm;
if d == 31 then
    SP[] = result;
else
    X[d] = result;

Operational information

If PSTATE.DIT is 1:

  • The execution time of this instruction is independent of:
    • The values of the data supplied in any of its registers.
    • The values of the NZCV flags.
  • The response of this instruction to asynchronous exceptions does not vary based on:
    • The values of the data supplied in any of its registers.
    • The values of the NZCV flags.
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