The portion of the clock tree is coupled to receive the control signal for collectively conditionally gating the plurality of clock, and is also configured to individually conditionally gate at least some of the plurality of clocks responsive to {HEAD ~ activity} in {TAIL ~ the respective subcircuits} of the execution circuit 
The portion of the clock tree is coupled to receive the control signal for collectively conditionally gating the plurality of clock , and is also configured to individually conditionally gate at least some of the plurality of clocks responsive to { HEAD ~ activity } in { TAIL ~ the respective subcircuits } of the execution circuit
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