Index

ANDS (immediate)

Bitwise AND (immediate), setting flags, performs a bitwise AND of a register value and an 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 TST (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 1 1 1 0 0 1 0 0 N immr imms Rn Rd
opc

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

ANDS <Wd>, <Wn>, #<imm>

64-bit (sf == 1)

ANDS <Xd>, <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>

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

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

Is the 64-bit name of the general-purpose destination register, 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
TST (immediate) Rd == '11111'

Operation

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

result = operand1 AND imm;
PSTATE.<N,Z,C,V> = result<datasize-1>:IsZeroBit(result):'00';

X[d, datasize] = result;

Operational information

If PSTATE.DIT is 1: