Signed Divide (idiv)

idiv{bwl}		r/m[8|16|32]

Operation

AX r/m8 -> AL

DX:AX r/m16 -> AX

EDX:EAX r/m32 -> EAX

Description

idiv executes signed division. idiv divides a 16-, 32-, or 64-bit register value (dividend) by a register or memory byte, word, or long (divisor). The size of the divisor (8-, 16- or 32-bit operand) determines the particular register used as the dividend, quotient, and remainder.

If the resulting quotient is too large to fit in the destination, or if the divisor is 0, an Interrupt 0 is generated. Non-integral quotients are truncated toward 0. The remainder has the same sign as the dividend; the absolute value of the remainder is always less than the absolute value of the divisor.

Example

Perform a 16-bit signed divide of the DX:AX register by the contents of the effective address (addressed by the EDI register plus an offset of 4) and store the quotient in the AX register

divw 4(%edi)