Moving bytes to double words
•MOVZX reg, reg/mem – move with zero extend
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•Replaces the contents of the first operand with the contents of the second filling the rest of bits with zeros.
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•Solution for the previous task:
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•MOVZX   EBX, AL 
•ADD        ECX, EBX
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•or if we want to reuse EAX register
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•MOVZX   EAX, AL 
•ADD        ECX, EAX