Use of delayed addition techniques to accelerate integer and floating-point calculations in configurable hardware

Zhen Luo; Margaret Martonosi

doi:10.1117/12.327033

Abstract

This paper proposes and evaluates an approach for improving the performance of arithmetic calculations via delayed addition. Our approach employs the idea used in Wallace trees to delay addition until the end of a repeated calculation such as accumulation or dot-product; this effectively removes carry propagation overhead from the calculation's critical path. We present imager and floating- point designs that use this technique. Our pipelined integer multiply-accumulate design is based on a fairly traditional multiplier design, but with delayed addition as well. This design achieves a 37 MHz clock rate on an XC4036XL-2 FPGA. Next, we present a 32-bit floating-point accumulator based on delayed addition. Here delayed addition requires a novel alignment technique that decouples the incoming operands from the accumulated result. A conservative version of this design achieves a 33 MHz clock rate. Finally, we also present a more aggressive 32-bit floating-point accumulator design that achieves a 66 MHz clock rate. These designs demonstrate the utility of delayed addition for accelerating FPGA calculations in both the integer and floating-point domains.

Citation Download Citation

Zhen Luo, Zhen Luo, Margaret Martonosi, Margaret Martonosi, } "Use of delayed addition techniques to accelerate integer and floating-point calculations in configurable hardware", Proc. SPIE 3526, Configurable Computing: Technology and Applications, (8 October 1998); doi: 10.1117/12.327033; https://doi.org/10.1117/12.327033

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