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assemblykeilarm7

Keil ARM7 Program That Searches An Array

The program requires reading the elements of an array of 10 numbers and count the number of zeros in that array and store it in R7. Here's what I've developed so far...

    AREA addition, CODE, READWRITE
    ENTRY
    LDR R0,=ARR
    MOV R1, #0        ; Loop Iterator
    MOV R2, #0        ; Array Index
    MOV R7, #0        ; Number Of Zeros In The Array

LOP CMP R1, #10
    BEQ EXT
    LDR R3, [R0]
    CMP R3, #0
    BEQ MOVE1
    B CNT

MOVE1 ADD R7, R7, #1
      B CNT

CNT ADD R2, R2, #4
    ADD R1, R1, #1
    B LOP

ARR DCD 3,-5,-1,0,10,0,4,-8,7,6
EXT

    END

The problem is that it never enters MOVE1. I really cannot figure out why.

Thanks in advance.

Solution

  • R0 never changes, so the value loaded into R3 never changes, so the test for your loop always comes out the same way. (And you don't need the B CNT after MOVE1, since that is the next instruction, anyway.)