ADC

The ADC instruction is an assembly language instruction that stands for "Add with Carry." It is used to perform addition operations with carry (carry flag) in assembly language.

The ADC instruction has the following syntax:

The destination and source operands can be registers or memory locations. The ADC instruction adds the values of destination and source, along with the value of the carry flag (CF), and stores the result in the destination operand.

Here are a few examples to illustrate the usage of ADC:

1.Adding with carry using registers:

In this example, the ADC instruction is used to add the contents of EAX and EBX, along with the carry flag (CF). The initial values of EAX and EBX are 10 and 20, respectively. The carry flag is set to 1 (CF=1). After the ADC instruction, EAX will contain the result of the addition, which is 31 (10 + 20 + 1).

2.Adding with carry using memory locations:

In this example, the ADC instruction is used to add the values at memory locations value1 and value2, along with the carry value stored at memory location carry. The values stored at these memory locations are 100, 200, and 1, respectively. After the ADC instruction, AX will contain the result of the addition, which is 301 (100 + 200 + 1).

The ADC instruction is useful when performing addition operations that involve a carry from a previous operation. It allows for chained addition operations to handle carry propagation, enabling the addition of larger numbers or implementing arithmetic operations on multi-word values.