Add With Carry

Encoding

Description

The ADC instruction adds the source operand, the destination operand, and the carry flag. The result is stored in the destination operand.

This instruction is designed for use in multiword additions such as in arbitrary precision arithmetic.

This instruction can be used with the LOCK prefix to allow atomic exectution.

Operation

// `src` is sign extended to the width of `dest`

public void ADC(ref U8 dest, U8 src)
{
    dest += src + CF;
}
public void ADC(ref U16 dest, U16 src)
{
    dest += src + CF;
}
public void ADC(ref U32 dest, U32 src)
{
    dest += src + CF;
}
public void ADC(ref U64 dest, U64 src)
{
    dest += src + CF;
}

Flags Affected

CF (carry flag)

Set according to the result.

PF (parity flag)

Set according to the result.

AF (auxiliary flag)

Set according to the result.

ZF (zero flag)

Set according to the result.

SF (sign flag)

Set according to the result.

OF (overflow flag)

Set according to the result.

Intrinsics

uint8_t _addcarry_u8(uint8_t c_in, uint8_t src1, uint8_t src2, uint8_t *sum_out)
uint8_t _addcarry_u16(uint8_t c_in, uint16_t src1, uint16_t src2, uint16_t *sum_out)
uint8_t _addcarry_u32(uint8_t c_in, uint32_t src1, uint32_t src2, uint32_t *sum_out)
uint8_t _addcarry_u64(uint8_t c_in, uint64_t src1, uint64_t src2, uint64_t *sum_out)

Exceptions