# How many operands does Imul have?

## How many operands does Imul have?

three
The three-operand form of imul executes a signed multiply of a 16- or 32-bit immediate by a register or memory word or long and stores the product in a specified register word or long.

## How many form does the Imul instruction have?

three forms
The three forms of the IMUL instruction are similar in that the length of the product is calculated to twice the length of the operands. With the one-operand form, the product is stored exactly in the destination.

What does Imul mean?

IMUL

Acronym Definition
IMUL Integer Multiply

### What is the difference between MUL and Imul?

The MUL instruction multiplies unsigned numbers. IMUL multiplies signed numbers. Multiplying two 8-bit numbers produces a 16-bit result returned in AX. Multiplying two 16-bit operands yields a 32-bit result in DX:AX.

### When a word operand is multiplied with ax the result is stored in which register?

The multiplicand should be in the AX register, and the multiplier is a word in memory or another register. For example, for an instruction like MUL DX, you must store the multiplier in DX and the multiplicand in AX. The resultant product is a doubleword, which will need two registers.

What is test EAX EAX?

Anding a value with itself gives the same value, so test eax, eax sets the flags based on whatever eax contains. ZF is set when the result of an operation is zero. jne jumps when ZF is not set. So the jump will be taken when strcmp returns nonzero, meaning the strings are unequal.

#### What is SAR instruction?

The shift arithmetic right (SAR) and shift logical right (SHR) instructions shift the bits of the destination operand to the right (toward less significant bit locations). The SAR and SHR instructions can be used to perform signed or unsigned division, respectively, of the destination operand by powers of 2.

#### How does MUL work in assembly?

The mul instruction is used to perform a multiplication. Always multiplies EAX by a value. The result of the multiplication is stored in a 64-bits value accross EDX (most significant 32 bits of the operation) and EAX (least significant 32 bits of the operation).

What is difference between div and IDIV?

The DIV instruction divides unsigned numbers, and IDIV divides signed numbers. Both return a quotient and a remainder. The dividend is the number to be divided, and the divisor is the number to divide by. The quotient is the result.

## What is the difference between and & test instruction?

The operands may be doublewords, words, or bytes. The difference between TEST and AND is that TEST does not alter the destination operand. TEST differs from BT in that TEST is useful for testing the value of multiple bits in one operations, whereas BT tests a single bit.

## What does the three operand form of Imul do?

The three-operand form of imul executes a signed multiply of a 16- or 32-bit immediate by a register or memory word or long and stores the product in a specified register word or long. imul clears the overflow and carry flags under the following conditions:

How are Mul and IMUL multiplication instructions the same?

When the operand is a byte, it is multiplied with AL register and when it is a word, it is multiplied with AX register. The operation of MUL and IMUL instructions are same.

### Where is the source operand stored in IMUL?

Here, the source operand (in a general-purpose register or memory location) is multiplied by the value in the AL, AX, EAX, or RAX register (depending on the operand size) and the product (twice the size of the input operand) is stored in the AX, DX:AX, EDX:EAX, or RDX:RAX registers, respectively.

### Where is the intermediate product stored in IMUL?

The intermediate product (twice the size of the first source operand) is truncated and stored in the destination operand (a general-purpose register). When an immediate value is used as an operand, it is sign-extended to the length of the destination operand format.