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Non-Confidential PDF versionARM DUI0379H ARM® Compiler v5.06 for µVision® armasm User GuideVersion 5Home > ARM and Thumb Instructions > CMP and CMN 10.29 CMP and CMN Compare and Compare Negative. Syntax CMP{cond} Rn, Operand2 CMN{cond} Rn, Operand2 where: cond is an optional condition
Difference is then discarded. If subtrahend is an immediate value it will be sign extended to the length of minuend . The EFLAGS register is set in the same manner as a sub instruction. Note that the GAS/AT&T syntax can be rather confusing, as for example cmp $0, %rax followed by
Jul 11, 2007 Just as a quick summary, I wrote this article for two purposes. First, It is interesting, and more knowledge of how your computer works is always helpful. Secondly, there are always programs where flags will be manipulated directly, and it is helpful to know the effects they will have on jumps. For example
The cmp instruction has two operands: cmp reg/mem, reg/mem/constant. The computer will perform a subtraction of operand2 from operand1 (but not changing the value of either one) and set the O, S, Z, A, P, and C flags (but does not affect the D and I flags). The results of the subtraction are lost. (The carry flag is set on
Subtracts operand1 from operand2, but does not store the result; only changes the flags. cmp is typically executed in conjunction with conditional jumps and the set cc instruction. If an operand greater than one byte is compared to an immediate byte, the immediate byte value is first sign-extended.
Dec 8, 2013
The cmp instruction is used to perform comparison. It's identical to the sub instruction except it does not affect operands. It impacts the Zero Flag (ZF) as well as the Carry Flag (CF) as follows:
JNZ is short for "Jump if not zero (ZF = 0)", and NOT "Jump if the ZF is set". If it's any easier to remember, consider that JNZ and JNE (jump if not equal) are equivalent. Therefore, when you're doing cmp al, 47 and the content of AL is equal to 47, the ZF is set, ergo the jump (if Not Equal - JNE) should not be
It is generally used in conditional execution. This instruction basically subtracts one operand from the other for comparing whether the operands are equal or not. It does not disturb the destination or source operands. It is used along with the conditional jump instruction for decision making.
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