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Process variation will greatly impact the power and performance of future microprocessors. Design approaches based on multiple supply or threshold voltage assignment provide techniques to statically tune critical path delays for energy savings . However, under process variation, the delay of critical paths may vary, and a large number of critical paths in circuits reduces the maximum operating frequency of pipelined processors. One proposed postfabrication solution is to adaptively tune thedoi:10.1109/isscc.2008.4523228 dblp:conf/isscc/LiangBW08 fatcat:arzyakh7srbg5hrxq2uf2npmjq