IDIV

IDIV performs signed integer division. The explicit operand provided is the divisor; the dividend and destination operands are implicit, in the following way:

For IDIV r/m8, AX is divided by the given operand; the quotient is stored in AL and the remainder in AH.
For IDIV r/m16, DX:AX is divided by the given operand; the quotient is stored in AX and the remainder in DX.
For IDIV r/m32, EDX:EAX is divided by the given operand; the quotient is stored in EAX and the remainder in EDX.

Unsigned integer division is performed by the DIV instruction: see DIV.

Forms

Every form of idiv the assembler accepts, from NASM's own instruction table. The second column is the processor that introduced the form; a badge marks a form that needs an extension, that is lockable, or that long mode dropped.

Form	Since	Notes
idiv r/m8	8086	long
idiv r/m16	8086	long
idiv r/m32	386	long
idiv r/m64	x86-64	long

Signed Divide

Forms