Need explanation of how each line works in the assembly code

[patan.gova]

Hi,
Can some one explain me of how each line in the below assembly code works and what is the result of each line and also output value at the ending if input_delay0 ia assumed as '0'.

	mov.w &input_delay0,R12
			mov.w R12,R13
			rra.w R13
			rra.w R13
			add.w R12,R13
			rra.w R13
			rra.w R13
			rra.w R13
			rra.w R13
			rra.w R13
			rra.w R13
			rra.w R13
			rra.w R13
			rra.w R13
			rra.w R13
			rra.w R13
			rra.w R13
			mov.w R13,R14
			add.w R14,&output

thanks.

 

[kam1787]

http://www.ece.utep.edu/courses/web3376/Notes_files/ee3376-assembly.pdf