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Instruction, CMP. Function, Compare. Category, Data processing. ARM family, All CMP permits you to compare two values, automatically updating the flags to ?All instructions have allowed us to manipulate data ARM also has variants of the branch instruction that only goto the . ?Use CMP and BLE, BLT, BGE, BGT.22 Aug 2008 Main features of the ARM Instruction Set Thumb instruction formats are less regular than ARM instruction .. CMP operand1 - operand2. 6 Jun 2016 Sounds like your lecture slides are slightly mixed up. The point of CMP is that if the two operands are equal then the result is zero, which means The first CMP instruction in the code above triggers Negative bit to be set (2 – 3 Some ARM processor versions support the “IT” instruction that allows up to 4 The ARM instruction set formats are shown below. Figure 4-1: CMP. Compare. CPSR flags := Rn - Op2. 4.5. EOR. Exclusive OR. Rd := (Rn AND NOT Op2). 3 Mar 2012 Compare Instructions. {cond} Rn,Operand2. . CMP – compare. Flags set to result of (Rn ? Operand2). CMN – compare CMP and CMN Compare and Compare Negative. The CMP instruction subtracts the value of Operand2 from the value in Rn . This is the same as a SUBS These instructions compare the value in a register with Operand2. The CMP instruction subtracts the value of Operand2 from the value in Rn. You cannot use pc for any operand in any data processing instruction that has a register-controlled shift (see Flexible second operand). Non-Confidential PDF versionARM DUI0379H ARM® Compiler v5.06 for µVision® armasm User GuideVersion 5Home > ARM and Thumb Instructions > CMP