[libre-riscv-dev] [Bug 127] Transcendentals needed (SIN/COS/ATAN2/EXP/LOG/POW etc.)

[bugzilla-daemon at libre-riscv.org]

http://bugs.libre-riscv.org/show_bug.cgi?id=127

--- Comment #16 from Jacob Lifshay <programmerjake at gmail.com> ---
found a pair of algorithms that look like they'd be quite useful for
implementing trig/log/exp/hypot/hyperbolics/sqrt/rsqrt/divide:

http://perso.ens-lyon.fr/jean-michel.muller/BKM94.pdf

they are shift-add algorithms, so should be rather simple to implement.

they use a redundant number representation, so avoid needing full carry chains
before the last stage, allowing a reduction in power and area used.

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