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Registers X1, X2, X3 have corresponding data stored in each location: X1: AX2: BX3: C Which set of ARM instructions will accomplish A=B+C?

Question

Registers X1, X2, X3 have corresponding data stored in each location: X1: AX2: BX3: C Which set of ARM instructions will accomplish A=B+C?

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Solution

The set of ARM instructions to accomplish A=B+C would be:

  1. LDR R0, [X2] ; Load the value at memory location X2 (B) into register R0
  2. LDR R1, [X3] ; Load the value at memory location X3 (C) into register R1
  3. ADD R0, R0, R1 ; Add the values in register R0 and R1, store the result in R0
  4. STR R0, [X1] ; Store the value in register R0 at memory location X1 (A)

This set of instructions will result in A (X1) being equal to B (X2) + C (X3).

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