ADCS

Add with carry, setting flags

This instruction adds two register values and the Carry flag value, and writes the result to the destination register. It updates the condition flags based on the result.

Encoding: Setting the condition flags

313029282726252423222120191817161514131211109876543210
0111010000000000
sfopSRmRnRd

32-bit (sf == 0)

ADCS <Wd>, <Wn>, <Wm>

64-bit (sf == 1)

ADCS <Xd>, <Xn>, <Xm>

Decoding algorithm

constant integer d = UInt(Rd);
constant integer n = UInt(Rn);
constant integer m = UInt(Rm);
constant integer datasize = 32 << UInt(sf);

Operation

constant bits(datasize) operand1 = X[n, datasize];
constant bits(datasize) operand2 = X[m, datasize];
bits(datasize) result;
bits(4) nzcv;

(result, nzcv) = AddWithCarry(operand1, operand2, PSTATE.C);

X[d, datasize] = result;
PSTATE. = nzcv;

Explanations

<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 first general-purpose source register, encoded in the "Rn" field.
<Wm>: Is the 32-bit name of the second general-purpose source register, encoded in the "Rm" 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 first general-purpose source register, encoded in the "Rn" field.
<Xm>: Is the 64-bit name of the second general-purpose source register, encoded in the "Rm" field.

Operational Notes

If PSTATE.DIT is 1: