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ADDS (immediate)

Add (immediate), setting flags, adds a register value and an optionally-shifted immediate value, and writes the result to the destination register. It updates the condition flags based on the result.

This instruction is used by the alias CMN (immediate).

313029282726252423222120191817161514131211109876543210
sf01100010shimm12RnRd
opS

32-bit (sf == 0)

ADDS <Wd>, <Wn|WSP>, #<imm>{, <shift>}

64-bit (sf == 1)

ADDS <Xd>, <Xn|SP>, #<imm>{, <shift>}

integer d = UInt(Rd);
integer n = UInt(Rn);
integer datasize = if sf == '1' then 64 else 32;
bits(datasize) imm;

case sh of
    when '0' imm = ZeroExtend(imm12, datasize);
    when '1' imm = ZeroExtend(imm12:Zeros(12), datasize);

Assembler Symbols

<Wd>

Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field.

<Wn|WSP>

Is the 32-bit name of the source general-purpose register or stack pointer, encoded in the "Rn" field.

<Xd>

Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field.

<Xn|SP>

Is the 64-bit name of the source general-purpose register or stack pointer, encoded in the "Rn" field.

<imm>

Is an unsigned immediate, in the range 0 to 4095, encoded in the "imm12" field.

<shift> Is the optional left shift to apply to the immediate, defaulting to LSL #0 and encoded in sh:
sh <shift>
0 LSL #0
1 LSL #12

Alias Conditions

AliasIs preferred when
CMN (immediate)Rd == '11111'

Operation

bits(datasize) result;
bits(datasize) operand1 = if n == 31 then SP[] else X[n];
bits(4) nzcv;

(result, nzcv) = AddWithCarry(operand1, imm, '0');

PSTATE.<N,Z,C,V> = nzcv;

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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