{HEAD ~ A processor} may include an execution circuit configured to execute an instruction, {TAIL ~ an issue circuit} coupled to the execution circuit, and a clock tree for clocking circuitry in the processor 
{ HEAD ~ A processor } may include an execution circuit configured to execute an instruction , { TAIL ~ an issue circuit } coupled to the execution circuit , and a clock tree for clocking circuitry in the processor
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH