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(5) 1. Why does ARM provide a reverse subtract instruction RSB rO, r1, r2 that implements [r0] [r2] [r1] when the normal subtraction instruction SUB

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(5) 1. Why does ARM provide a reverse subtract instruction RSB rO, r1, r2 that implements [r0] [r2] [r1] when the normal subtraction instruction SUB rO, r2, r1 will do exactly the same job

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