What is the difference between the TEQ and CMP and CMN comparison instructions?
What will be an ideal response?
The CMP instruction is the standard comparison instruction and is implemented by all processors. CMP a,b compares a and b by performing the subtraction a ? b and then setting the condition code bits accordingly.
The ARM’s TEQ (test equivalent) is unusual, TEQ a,b evaluates a?b. If the bits of a and the bits of b are the same, the Z?bit of the CCR is set. Note that the difference between CMP and TEQ is that CMP also sets (evaluates) the C?bit. TEQ has no effect on the C?bit.
The ARM’s CMN instruction is a n
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