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
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 |
| 0 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | | | | | | 0 | 0 | 0 | 0 | 0 | 0 | | | | | | | | | | |
sf | op | S | | Rm | | Rn | Rd |
---|
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:
-
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.