Function path_A

src/Tests/CoolProp-Tests-TermCacheProfile.cpp:136–144

Path A: independently evaluate exp(l_i * log_delta) and exp(m_i * log_tau) for every term, the way the live all() does today. Returns a sink to defeat DCE.

// Path A: independently evaluate exp(l_i * log_delta) and exp(m_i * log_tau) for
// every term, the way the live all() does today.  Returns a sink to defeat DCE.
double path_A(const std::vector<double>& ls, const std::vector<double>& ms, double log_delta, double log_tau) {
    double acc = 0.0;
    const std::size_t Nl = ls.size(), Nm = ms.size();
    for (std::size_t i = 0; i < Nl; ++i)
        acc += std::exp(ls[i] * log_delta);
    for (std::size_t i = 0; i < Nm; ++i)
        acc += std::exp(ms[i] * log_tau);
    return acc;
}

// Path B: precompute one exp() per unique exponent, then do a small linear-search
// lookup per term to fetch the cached value.  Realistic for the typical case where