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(nasm.info)Section B.4.117

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B.4.117. `IDIV': Signed Integer Divide
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     IDIV r/m8                     ; F6 /7                [8086]
     IDIV r/m16                    ; o16 F7 /7            [8086]
     IDIV r/m32                    ; o32 F7 /7            [386]

   `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
*Note Section B.4.59::.