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Operand Registers and Explicit Operand Forwarding
July-December 2009 (vol. 8 no. 2)
pp. 60-63
James Balfour, Stanford University, Stanford
Richard C. Harting, Stanford University, Stanford
William J. Dally, Stanford University, Stanford
Operand register files are small, inexpensive register files that are integrated with function units in the execute stage of the pipeline, effectively extending the pipeline operand registers into register files. Explicit operand forwarding lets software opportunistically orchestrate the routing of operands through the forwarding network to avoid writing ephemeral values to registers. Both mechanisms let software capture short-term reuse and locality close to the function units, improving energy efficiency by allowing a significant fraction of operands to be delivered from inexpensive registers that are integrated with the function units. An evaluation shows that capturing operand bandwidth close to the function units allows operand registers to reduce the energy consumed in the register files and forwarding network of an embedded processor by 61%, and allows explicit forwarding to reduce the energy consumed by 26%.
Index Terms:
Memory hierarchy, Physically aware micro-architecture: power, thermal, impact of technology trends, Real-time and embedded systems, Code generation, Optimization, Impact of VLSI on system design, VLSI Systems, Computer System Implementation, Computer Systems Organizat
Citation:
James Balfour, Richard C. Harting, William J. Dally, "Operand Registers and Explicit Operand Forwarding," IEEE Computer Architecture Letters, vol. 8, no. 2, pp. 60-63, July-Dec. 2009, doi:10.1109/L-CA.2009.45
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