Write a program that counts the number of bits equal to one in R1, and stores the result in R2. For example, if R1=x0A0C, then R2=x0004 after the program runs. To receive credit, you can only modify the contents of R1 and R2, and no other register, and your solution should have no more than 9 lines of code.

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25 July, 03:02

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Hillary Dickson · Answer 1

MOV R1, $0A0C;

MOV R2, #0;

L1 : MOV R1, R1, LSL #1;

ADC R2, R2, #1;

CMP R1, #0;

BNE L1;