This is a classic problem of assembly language programming. Write a sequence of ARM instructions that swap the contents of registers r0 and r1 without using any additional registers or memory storage; that is, you can’t move r1 to a temporary location.
What will be an ideal response?
This sleight of hand uses the XOR, exclusive OR. Consider a and b.
So, to swap r0 and r1 write
EOR r0,r0,r1
EOR r1,r0,r1
EOR r0,r0,r1
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