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if operand forwarding use / Data forwarding use then in this case your one clock time will be save .......if reverse the vice versa ...it apply in the case of R-W hazard or true dependency,in this case it is not go write back stage direct go in register for  execution of next  instruction 

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sushmita asked Dec 17, 2018
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we do forwarding from WB stage to EX or from WB to MEM stage??