14 ib         ADC AL, imm8                 Add with carry imm8 to AL

15 iw         ADC AX, imm16                 Add with carry imm16 to AX

15 id         ADC EAX, imm32                 Add with carry imm32 to EAX

80 /2 ib         ADC r/m8, imm8                 Add with carry imm8 to r/m8

81 /2 iw         ADC r/m16,imm16                 Add with carry imm16 to r/m16

81 /2 id         ADC r/m32,imm32                 Add with CF imm32 to r/m32

83 /2 ib         ADC r/m16,imm8                 Add with CF sign-extended imm8 to r/m16

83 /2 ib         ADC r/m32,imm8                 Add with CF sign-extended imm8 into r/m32

10 / r         ADC r/m8,r8                 Add with carry byte register to r/m8

11 / r         ADC r/m16,r16                 Add with carry r16 to r/m16

11 / r         ADC r/m32,r32                 Add with CF r32 to r/m32

12 / r         ADC r8,r/m8                 Add with carry r/m8 to byte register

13 / r         ADC r16,r/m16                 Add with carry r/m16 to r16

13 / r         ADC r32,r/m32                 Add with CF r/m32 to r32


Description

Adds the destination operand (first operand), the source operand (second operand), and the carry (CF) flag and stores the result in the destination operand. The destination operand can be a register or a memory location; the source operand can be an immediate, a register, or a memory location. (However, two memory operands cannot be used in one instruction.) The state of the CF flag represents a carry from a previous addition. When an immediate value is used as an operand, it is sign-extended to the length of the destination operand format.


The ADC instruction does not distinguish between signed or unsigned operands. Instead, the processor evaluates the result for both data types and sets the OF and CF flags to indicate a carry in the signed or unsigned result, respectively. The SF flag indicates the sign of the signed result.


The ADC instruction is usually executed as part of a multibyte or multiword addition in which an ADD instruction is followed by an ADC instruction.


Operands        Bytes                Clocks

reg, reg             2                       1   PU

mem, reg                 2+d(0,2)        3   PU

reg, mem          2+d(0,2)          2   PU

reg, imm          2+i(1,2)           1   PU

mem, imm          2+d(0,2)+i(1,2)          3   PU*

acc, imm          1+i(1,2)           1   PU


* = not pairable if there is a displacement and immediate

                       

Flags

The OF, SF, ZF, AF, CF, and PF flags are set according to the result.

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