Program To Multiply Routine (Bit Shift And Add) In X86 Assembly Language Using EBE Assignment Solution

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        segment .data

a db 1100b ; multiplicand

b db 0110b ; multiplier

size db 7 ; size of multiplier

result dw 0 ; result

        segment .text

        global main

main:

        mov word [result], 0 ; result = 0

        movzx bx, byte [b] ; load multiplier number2

        movzx cx, [size] ; i = 7

forloop:

        bt bx, cx ; test bit(number2,i)

        jnc endif ; if not 1, go to next bit

        movzx ax, byte [a] ; else load number1

        shl ax, cl ; shift to multiply by 2^i

        add [result],ax ; result = result + number1*2^i

endif:

        dec cl ; i--

        jge forloop ; repeat while i>=0

        ret