Abstract
We present SpExSim, a software tool for quickly surveying legacy code bases for kernels that could be accelerated by FPGA-based compute units. We specifically aim for low development effort by considering the use of C-based high-level hardware synthesis, instead of complex manual hardware designs. SpExSim not only exploits the spatially distributed model of computation commonly used on FPGAs, but can also model the effect of two different microarchitectures commonly used in C-to-hardware compilers, including pipelined architectures with modulo scheduling. The estimations have been validated against actual hardware generated by two current HLS tools.
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