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CMP. R1,#0. ; Compare R1 with zero and branch to fred. ; if R1 was zero, otherwise continue. BEQ fred. ; continue to next instruction. BL sub+ROM. ; Call SUBS pc, lr, # imm writes an address to the PC. The alignment of this address must be correct for the instruction set in use after the exception return:. Arithmetic instructions ( ADD , SUB , etc) don't modify the status flag, unlike comparison instructions ( CMP , TEQ ) which update theThis instruction subtracts an optionally-shifted register value from a register value, and writes the result to the destination register. It can optionally The SUB variant of the instruction is an interworking branch, see Pseudocode description of operations on the AArch32 general-purpose registers and the PC. · The The ADD instruction adds the values in Rn and Operand2 . The SUB instruction subtracts the value of Operand2 from the value in Rn . The SUB instruction subtracts the value of Operand2 or imm12 from the value in Rn . In certain circumstances, the assembler can substitute one instruction for The SUB instruction subtracts the value of Operand2 or imm12 from the value in Rn . The SBC instruction subtracts the value of Operand2 from the value in