Implement BigMath::PI with Gauss-Legendre algorithm #434
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It's fast and simple. Pi calculation will be the bottleneck when we improve sin/cos or erf/erfc with bit burst algorithm. Requires multiplication cost to be less than O(n^2).
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Need to merge #407 first.
It's fast and simple.
Pi calculation will be the bottleneck when we improve sin/cos or erf/erfc with bit burst algorithm. (#433, #458)
Multiplication cost needs to be less than
O(N^2).Time and error.
PI(prec)calculatesprec+16digits internally and round toprecdigits.