[libre-riscv-dev] [Bug 44] IEEE754 FPU inverse-sqrt

[bugzilla-daemon at libre-riscv.org]

http://bugs.libre-riscv.org/show_bug.cgi?id=44

--- Comment #4 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
different approach:

https://rei.iteso.mx/bitstream/handle/11117/5844/Design+and+Implementation+of+Reciprocal+Square+Root+Units+on+Digital+ASIC+Technology+For+Low+Power+Embedded+Applications.pdf

https://github.com/tomverbeure/math/blob/master/src/main/scala/math/FpxxRSqrt.scala

both these, as best i can tell, use a polynomial lookup table which requires
only 1 iteration of newton-raphson to give full accuracy.

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