FPGA Implementation of 64-Bit Exponential Function for HPC

Abstract

Most presented implementations of the exponential function confine to the single precision format. Increasing data width to the double precision format requires a different approach. The presented novel architecture employs three independent Look-Up Tables (LUTs) together with a short Taylor expansion exp(x)≈1+x. Implementation results show that the double precision exp() function implementation achieves huge performance with satisfactory accuracy, latency and FPGA area consumption.