std::erf versus erf_impl (Abramowitz & Stegun)
precision - type: double max error: 0.00000008301282160 avg error: 0.00000000873368430 eps: 0.00000000000000022
precision - type: float max error: 0.00000043585896492 avg error: 0.00000001815939754 eps: 0.00000011920928955
time - type: double erf_impl Time: 0.33404sec v: -0.9998469418
time - type: double std::erf Time: 0.22753sec v: -0.9998470089
time - type: float erf_impl Time: 0.24874sec v: -0.7626809478
time - type: float std::erf Time: 0.20945sec v: -0.7626809478
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