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Return to ARM instructions page Syntax: RSB{cond}{S} Rd, Rn, Operand2 RSB r7, r4, #99 ;subtracts the value in r4 from 99 and places the result in r7. 29 Oct 2018 Ok , so i went through the ARM documentation on this one , and i absolutely By using the FSO as part of a SUB or RSB instruction , you'reUse of PC and SP in ARM instructions. You cannot use PC for Rd or any operand in an RSB instruction that has a register-controlled shift. If you use PC ( R15 ) as Rn or Rm , the value used is the address of the instruction plus 8. If you use PC as Rd : The ADD instruction adds the values in Rn and Operand2 . The SUB instruction subtracts the value of Operand2 from the value in Rn . The RSB (Reverse SuBtract) instruction subtracts the value in Rn from the value of Operand2 . ARM family, All. Notes, - RSB will subtract one value from another. The difference between this and SUB Technical. The instruction bit pattern is as follows: The ADD instruction adds the value of Operand2 or imm12 to the value in Rn . The ADC instruction adds the values in Rn and Operand2 , together with the carry 23 May 2017 The RSB instruction is a Reverse SuBtract without carry. The documentation indicates the syntax: RSB{S}{cond} {Rd}, Rn, Operand2. The following usage can