Timeout in 10.0m

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\[1 - \left(\frac{1}{1 + 0.32759110000000002 \cdot \left|x\right|} \cdot \left(0.25482959199999999 + \frac{1}{1 + 0.32759110000000002 \cdot \left|x\right|} \cdot \left(-0.284496735999999972 + \frac{1}{1 + 0.32759110000000002 \cdot \left|x\right|} \cdot \left(1.42141374100000006 + \frac{1}{1 + 0.32759110000000002 \cdot \left|x\right|} \cdot \left(-1.45315202700000001 + \frac{1}{1 + 0.32759110000000002 \cdot \left|x\right|} \cdot 1.0614054289999999\right)\right)\right)\right)\right) \cdot e^{-\left|x\right| \cdot \left|x\right|}\]
1 - \left(\frac{1}{1 + 0.32759110000000002 \cdot \left|x\right|} \cdot \left(0.25482959199999999 + \frac{1}{1 + 0.32759110000000002 \cdot \left|x\right|} \cdot \left(-0.284496735999999972 + \frac{1}{1 + 0.32759110000000002 \cdot \left|x\right|} \cdot \left(1.42141374100000006 + \frac{1}{1 + 0.32759110000000002 \cdot \left|x\right|} \cdot \left(-1.45315202700000001 + \frac{1}{1 + 0.32759110000000002 \cdot \left|x\right|} \cdot 1.0614054289999999\right)\right)\right)\right)\right) \cdot e^{-\left|x\right| \cdot \left|x\right|}
double f(double x) {
        double r329858 = 1.0;
        double r329859 = 0.3275911;
        double r329860 = x;
        double r329861 = fabs(r329860);
        double r329862 = r329859 * r329861;
        double r329863 = r329858 + r329862;
        double r329864 = r329858 / r329863;
        double r329865 = 0.254829592;
        double r329866 = -0.284496736;
        double r329867 = 1.421413741;
        double r329868 = -1.453152027;
        double r329869 = 1.061405429;
        double r329870 = r329864 * r329869;
        double r329871 = r329868 + r329870;
        double r329872 = r329864 * r329871;
        double r329873 = r329867 + r329872;
        double r329874 = r329864 * r329873;
        double r329875 = r329866 + r329874;
        double r329876 = r329864 * r329875;
        double r329877 = r329865 + r329876;
        double r329878 = r329864 * r329877;
        double r329879 = r329861 * r329861;
        double r329880 = -r329879;
        double r329881 = exp(r329880);
        double r329882 = r329878 * r329881;
        double r329883 = r329858 - r329882;
        return r329883;
}

Reproduce

herbie shell --seed 2020056 
(FPCore (x)
  :name "Jmat.Real.erf"
  :precision binary64
  (- 1 (* (* (/ 1 (+ 1 (* 0.3275911 (fabs x)))) (+ 0.254829592 (* (/ 1 (+ 1 (* 0.3275911 (fabs x)))) (+ -0.284496736 (* (/ 1 (+ 1 (* 0.3275911 (fabs x)))) (+ 1.421413741 (* (/ 1 (+ 1 (* 0.3275911 (fabs x)))) (+ -1.453152027 (* (/ 1 (+ 1 (* 0.3275911 (fabs x)))) 1.061405429))))))))) (exp (- (* (fabs x) (fabs x)))))))