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MUL operation

MUL operation. MLU Operations The MUL instruction multiplies an 8-,16-,32-bits operand by either AL,AX,or EAX. The instruction format is: MUL r/m8 MUL r/m16 MUL r/m32 The result is in EDX and EAX .

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MUL operation

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  1. MUL operation

  2. MLU Operations • The MUL instruction multiplies an 8-,16-,32-bits operand by either AL,AX,or EAX. The instruction format is: • MUL r/m8 • MUL r/m16 • MUL r/m32 • The result is in EDX and EAX . • EDX sets the flag register if it is not zero ( as the result of operation over flow situation is Eax carries the product of operation. • Will we go through the detail of multiplication and division instruction later on this course.

  3. Example: • TITLE Multiply (AddSub2.asm) • ; This program Multiply two decimal numbers together. We need to put the first operand in eax, the ;second operand in another multi purpose register. The product goes to eax • ; Last update: 2/1/02 • INCLUDE Irvine32.inc • .data • val1 dword 10 • val2 dword 40 • .code • main PROC • mov eax,val1 ; eax=10 • mov ebx,val2 ; ebx=40 • mul ebx ; eax=ebx*eax • call writedec • exit • main ENDP • END main

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