## What does IDIV mean in assembly?

## What does IDIV mean in assembly?

signed division

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.

## What is the difference between div and IDIV?

Using Division Instructions: The DIV instruction divides unsigned numbers, and IDIV divides signed numbers. Both return a quotient and a remainder. Table 4.1 summarizes the division operations. The dividend is the number to be divided, and the divisor is the number to divide by.

**What does Div BX mean?**

The DIV BX instruction divides the 32-bit value in DX:AX by BX. Since you’re not initializing DX, the upper word of the dividend is whatever garbage was left in the DX register from the previous computation, so you’re really dividing 0x00040078=262314 by 10.

**How does CDQ work?**

The CDQ instruction copies the sign (bit 31) of the value in the EAX register into every bit position in the EDX register. The CQO instruction (available in 64-bit mode only) copies the sign (bit 63) of the value in the RAX register into every bit position in the RDX register.

### What does Imul do in assembly?

The single-operand form of imul executes a signed multiply of a byte, word, or long by the contents of the AL, AX, or EAX register and stores the product in the AX, DX:AX or EDX:EAX register respectively.

### How do you split an assembly arm?

- The ARM processor does not have a divide instruction.
- There are algorithms available that computes the quotient and the remainder of a division. For example, through repeated subtraction:
- The “run time library” provides a more efficient function to compute the quotient of a division.
- Example Program: (Demo above code)

**Where is the dividend and divisor?**

When we divide two numbers, the number that is being divided is the dividend, whereas the number by which we divide is the divisor. For example, 12 candies are to be divided among 3 children. So we have 12 รท 3. Here, 12 is the dividend, and 3 is the divisor.

**What does CDQ do in assembly?**

The CDQ (Convert Doubleword to Quadword) instruction extends the sign bit of EAX into the EDX register.

#### What are Assembly registers?

a register is a small bit of memory that sits inside the CPU. and is used by assembly language to perform various tasks.