ORR (immediate)
Bitwise OR (immediate)
This instruction performs a bitwise (inclusive) OR of a
register value and an immediate register value, and writes
the result to the destination register.
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.
This instruction is used by the alias
MOV (bitmask immediate)
Rn == '11111' && !MoveWidePreferred(sf, N, imms, immr)
See
below for details of when the alias is preferred.
0
1
1
0
0
1
0
0
0
0
ORR <Wd|WSP>, <Wn>, #<imm>
1
ORR <Xd|SP>, <Xn>, #<imm>
if sf == '0' && N != '0' then UNDEFINED;
constant integer d = UInt(Rd);
constant integer n = UInt(Rn);
constant integer datasize = 32 << UInt(sf);
bits(datasize) imm;
(imm, -) = DecodeBitMasks(N, imms, immr, TRUE, datasize);
<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.
<imm>
For the 32-bit variant: is the bitmask immediate, encoded in "imms:immr".
<imm>
For the 64-bit variant: is the bitmask immediate, encoded in "N:imms:immr".
<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.
Alias Conditions
constant bits(datasize) operand1 = X[n, datasize];
constant bits(datasize) operand2 = imm;
constant bits(datasize) result = operand1 OR operand2;
if d == 31 then
SP[] = ZeroExtend(result, 64);
else
X[d, datasize] = result;