A RISC-V Processor with Optimized CORDIC-Based Trigonometric Function Accelerator

Trigonometric functions are extensively utilized in engineering applications. Processors typically handle such operations in floating-point format using software-based methods, which exhibit significant latency. By employing an optimized CORDIC algorithm and a hardware architecture that emphasizes resource reuse, this paper presents a RISC-V embedded processor supporting floating-point trigonometric function extension and expands two dedicated trigonometric instructions. Evaluations on the XC7Z020 platform demonstrate that, compared to the processor without extended instructions, the proposed design achieves a speedup of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$193\times$</tex> in trigonometric computations with an 18.7% increase in resource consumption. The computational accuracy reaches 10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">–6</sup>.