adc

Add with Carry

ADC <Wd>, <Wn>, <Wm>

Adds two register values and the Carry flag.

Pseudocode Operation

result ← Wn + Wm + C
Wd ← result[0:31]

Example

ADC w0, w1, w2

Encoding

Binary Layout

11010000

28:21

20:16

000000

15:10

9:5

4:0

Format Data Processing (3-source)

Opcode 0x1A000000

Extension Base

Operands

Wd
Dest (32-bit)
Wn
First source / base 32-bit integer register
Wm
Second source / offset 32-bit integer register

Other forms of adc

adc Add with Carry (64-bit)
adc Add with Carry (A32)

Across architectures

Add With Carry : how x86, ARM, RISC-V, and PowerISA each do this.

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0x1A000000	ADC <Wd>, <Wn>, <Wm>		A64		0 \| 0 \| 0 \| 11010000 \| Rm \| 000000 \| Rn \| Rd
0x9A000000	ADC <Xd>, <Xn>, <Xm>		A64		1 \| 0 \| 0 \| 11010000 \| Rm \| 000000 \| Rn \| Rd

Description

Add with Carry adds two register values and the Carry flag value, and writes the result to the destination register.

Operation

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

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

X[d, datasize] = result;

adc