The MUL instruction multiplies unsigned numbers. IMUL multiplies signed numbers. For both instructions, one factor must be in the accumulator register (AL for 8-bit numbers, AX for 16-bit numbers, EAX for 32-bit numbers) .
What does Imul do in assembly?
Description. 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.
What is the difference between MUL and MUL?
The MUL multiplies the ‘unsigned numbers’. IMUL multiplies ‘signed numbers’. Explanation: The MUL and IMUL are multiplication instructions .
What is MUL instruction?
Purpose . Multiplies the contents of two general-purpose registers and stores the result in a third general-purpose register. Note: The mul instruction is supported only in the POWER® family architecture. Syntax.
What is Imul in microprocessor?
This insruction multilplies a signed byte (word) from a source with a signed byte (word) in AL (AX). All details of IMUL are exactly the same as that of MUL, except that if all bits of the destination are not used by the result, the result is sign extended.
What is the difference between MUL and Imul explain with example?
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.
What is Movsx Assembly?
Description. movsx reads the contents of the register or effective address as a word or byte . movsx then sign-extends the 16- or 32-bit value to the operand-size attribute of the instruction. The result is stored in the destination register by movsx.
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 does MUL stand for?
| Acronym Definition | MUL Made You Look | MUL Master Urgency List | MUL Multiply/Multiple | MUL Master Unit List |
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What is the use of bit test and modify instructions?
- Two register operands.
- A general register operand with a memory operand.
- An immediate operand with either a general register operand or a memory operand.
Which is correct for MUL instruction?
The MUL instruction multiplies the unsigned 8- bit integer in the accumulator and the unsigned 8-bit integer in the B register producing a 16-bit product. ... The high-order byte of the product is returned in the B register. The OV flag is set if the product is greater than 255 (0FFh), otherwise it is cleared.
What are the arithmetic instructions?
The arithmetic instructions define the set of operations performed by the processor Arithmetic Logic Unit (ALU). The arithmetic instructions are further classified into binary, decimal, logical, shift/rotate, and bit/byte manipulation instructions.
What does MUL do assembly?
The mul instruction is used to perform a multiplication . ... 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 used to connect more microprocessor?
An address bus consists of the lines that connect between the microprocessor address pins and the address pins of each of the memory chips in the microprocessor system. In anything but a very simple system, the address bus would connect to other units also, but for the moment we will ignore these other connections.
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.
Which register is used for loop instructions?
The LOOP instruction is mainly used to simulate the different loops in HLL. The Loop instructions use the CX register to indicate the loop count. Note that the ECX register can be used as a loop counter in 32-bit mode.
