How to make a pow of 2 numbers in 8 bits in assembly

Asked Oct 25 '19 at 13:11

Active Oct 25 '19 at 13:11

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My problem is: I want to make a pow of 2 numbers in 8 bits and save the result in 16 bits, I can't use operations in 16 bits in the process, like "MUL BX" only 8 bits numbers and I should get results until 65535, I don't know how to do it without use MUL BX

org 100h 

mov cl, exp        ;9 
mov al, base       ;3

dec cl             

start:            
 mov bl,base
 mul bx            ;I can't use this
 loop inicio

mov result,ax      ;I should sabe result in 16 bits

int 20h

base db 3
exp db 9
result dw 0h

asked Oct 25 '19 at 13:11

Jose Angel Martinez

1

The 8 bit `MUL BL` produces a 16 bit result. Are you allowed to use that? – Jester Oct 25 '19 at 13:40
Do you have any other arbitrary restrictions? Or any performance requirement? If not, you can of course implement multiply with a shift-and-add loop. – Peter Cordes Oct 25 '19 at 13:49
yhea, I try to use ´MUL BL´ but I don't get results greater than 255, and I should save 65535 in result variable – Jose Angel Martinez Oct 28 '19 at 18:54

How to make a pow of 2 numbers in 8 bits in assembly

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