Write an assembly language program to swap the contents of r

Write an assembly language program to swap the contents of register r0 and r1.

Solution

Assembly language program to swap the contents of register r0 and r1:

start

MOV r2, r0 ; the content of r0 is moved to r2, so that r0 is empty now

MOV r0, r1 ; the content of r1 is moved to r0, so that r1 is empty now

MOV r1, r2 ; now move the content of r2 to r1

stop