CflexHDL
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Algorithm ideas
Chstone and others (including MIPS simulator) https://github.com/A-T-Kristensen/patmos_HLS
Use alternative number representation: http://www.johngustafson.net/pdfs/BeatingFloatingPoint.pdf
https://github.com/yuguen/hint
Sigma-delta DAC https://github.com/iic-jku/iic-audiodac-v1/tree/main/verilog/rtl