Consider the following assembly code, and answer the following questions: DATA:

Question

Consider the following assembly code, and answer the following questions: DATA: DB 1 DB 1 DB 7 DB 3 RESULT: DB 0 main: MOV EAX, 4 MOV EBX, 0 MOV ECX, DATA LOOP: MOV EDX, [ECX] AND EDX, 1 ADD EBX, EDX ADD ECX, 1 DEC EAX JNZ LOOP FINISH: ADD EBX, '0' MOV [RESULT], EBX (a) Classify the operations used in the program into: memory operations, arithmetic operations, logical operations, and control operations. (b) Write the contents of the affected general purpose and flag registers, starting from the beginning of program, to the "JZ FINISH" instruction. (c) What is the purpose of this assembly program? (d) Re-write the program, try to use the lowest possible number of instructions.

Explanation / Answer

Ans 1
-> Memory Operations
   -DB -Define Byte (Used for defining Byte)
-> Control Opertions
   - MOV (Contents of destination are replaced by the contents of source)
-> Arithemetic Operations
   -ADD (It is used to add the content of 2 registers, a register & memory location, a register & a constant)
   -DEC (Decrement byte or word)
-> Logical Operations
   -AND (Logical AND)
   -JNZ (Single-Flag Jumps: keep going if not zero)

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