commons-math-core/src/main/java/org/apache/commons/math4/core/jdkmath/AccurateMath.java [414:432]:
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        exp(x, 0.0, hiPrec);

        double ya = hiPrec[0] + hiPrec[1];
        double yb = -(ya - hiPrec[0] - hiPrec[1]);

        double temp = ya * HEX_40000000;
        double yaa = ya + temp - temp;
        double yab = ya - yaa;

        // recip = 1/y
        double recip = 1.0 / ya;
        temp = recip * HEX_40000000;
        double recipa = recip + temp - temp;
        double recipb = recip - recipa;

        // Correct for rounding in division
        recipb += (1.0 - yaa * recipa - yaa * recipb - yab * recipa - yab * recipb) * recip;
        // Account for yb
        recipb += -yb * recip * recip;
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commons-math-core/src/main/java/org/apache/commons/math4/core/jdkmath/AccurateMath.java [493:511]:
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            exp(x, 0.0, hiPrec);

            double ya = hiPrec[0] + hiPrec[1];
            double yb = -(ya - hiPrec[0] - hiPrec[1]);

            double temp = ya * HEX_40000000;
            double yaa = ya + temp - temp;
            double yab = ya - yaa;

            // recip = 1/y
            double recip = 1.0 / ya;
            temp = recip * HEX_40000000;
            double recipa = recip + temp - temp;
            double recipb = recip - recipa;

            // Correct for rounding in division
            recipb += (1.0 - yaa * recipa - yaa * recipb - yab * recipa - yab * recipb) * recip;
            // Account for yb
            recipb += -yb * recip * recip;
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