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 r379962 = 1.0;
        double r379963 = 0.3275911;
        double r379964 = x;
        double r379965 = fabs(r379964);
        double r379966 = r379963 * r379965;
        double r379967 = r379962 + r379966;
        double r379968 = r379962 / r379967;
        double r379969 = 0.254829592;
        double r379970 = -0.284496736;
        double r379971 = 1.421413741;
        double r379972 = -1.453152027;
        double r379973 = 1.061405429;
        double r379974 = r379968 * r379973;
        double r379975 = r379972 + r379974;
        double r379976 = r379968 * r379975;
        double r379977 = r379971 + r379976;
        double r379978 = r379968 * r379977;
        double r379979 = r379970 + r379978;
        double r379980 = r379968 * r379979;
        double r379981 = r379969 + r379980;
        double r379982 = r379968 * r379981;
        double r379983 = r379965 * r379965;
        double r379984 = -r379983;
        double r379985 = exp(r379984);
        double r379986 = r379982 * r379985;
        double r379987 = r379962 - r379986;
        return r379987;
}

Reproduce

herbie shell --seed 2020047 
(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)))))))