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why does the ARM provide a reverse subtract intruction RSB r0,r1,r2 that implements[r0]=[r2]-[r1] when the normal subtraction instruction SUB r0,r2,r1 will do exactly the same
why does the ARM provide a reverse subtract intruction RSB r0,r1,r2 that implements[r0]=[r2]-[r1] when the normal subtraction instruction SUB r0,r2,r1 will do exactly the same job?
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