Why does using armv6 instead of c give me different results when all of my inputs are integers?

Suppose an image of 400x200 pixels, where each “pixel” is 8 bits (00000000 to 11111111) and stored starting at memory start address 0x80000000. Show a code sequence ARMv6 assembler language that goes over all "pixels" and summerari register R0 how many "pixels", of which have value greater than 12

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