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 r351325 = 1.0;
        double r351326 = 0.3275911;
        double r351327 = x;
        double r351328 = fabs(r351327);
        double r351329 = r351326 * r351328;
        double r351330 = r351325 + r351329;
        double r351331 = r351325 / r351330;
        double r351332 = 0.254829592;
        double r351333 = -0.284496736;
        double r351334 = 1.421413741;
        double r351335 = -1.453152027;
        double r351336 = 1.061405429;
        double r351337 = r351331 * r351336;
        double r351338 = r351335 + r351337;
        double r351339 = r351331 * r351338;
        double r351340 = r351334 + r351339;
        double r351341 = r351331 * r351340;
        double r351342 = r351333 + r351341;
        double r351343 = r351331 * r351342;
        double r351344 = r351332 + r351343;
        double r351345 = r351331 * r351344;
        double r351346 = r351328 * r351328;
        double r351347 = -r351346;
        double r351348 = exp(r351347);
        double r351349 = r351345 * r351348;
        double r351350 = r351325 - r351349;
        return r351350;
}

Reproduce

herbie shell --seed 2020020 
(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)))))))