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Deep-submicron CMOS designs have resulted in large leakage energy dissipation in microprocessors. While SRAM cells in on-chip cache memories always contribute to this leakage, there is a large variability in active cell usage both within and across applications. This paper explores an integrated architectural and circuit-level approach to reducing leakage energy dissipation in instruction caches. We propose, gated-Vdd, a circuit-level technique to gate the supply voltage and reduce leakage in unused SRAM cells. Our results indicate that gated-Vdd together with a novel resizable cache architecture reduces energy-delay by 62% with minimal impact on performance.