Twofold exp and log
Latkin, Evgeny
Original · EN
This article is about twofold arithmetic. Here I introduce algorithms and experimental code for twofold variant of C/C++ standard functions exp() and log(), and expm1() and log1p(). Twofold function y₀+y₁ ≈ f(x₀+x₁) is nearly 2x-precise so can assess accuracy of standard one. Performance allows assessing on-fly: twofold texp() over double is 10x times faster than expq() by GNU quadmath.
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