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\[\left(\frac{1}{\sqrt{\pi}} \cdot e^{\left|x\right| \cdot \left|x\right|}\right) \cdot \left(\left(\left(\frac{1}{\left|x\right|} + \frac{1}{2} \cdot \left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right) + \frac{3}{4} \cdot \left(\left(\left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right) + \frac{15}{8} \cdot \left(\left(\left(\left(\left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right)\]
\left(\frac{1}{\sqrt{\pi}} \cdot e^{\left|x\right| \cdot \left|x\right|}\right) \cdot \left(\left(\left(\frac{1}{\left|x\right|} + \frac{1}{2} \cdot \left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right) + \frac{3}{4} \cdot \left(\left(\left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right) + \frac{15}{8} \cdot \left(\left(\left(\left(\left(\left(\frac{1}{\left|x\right|} \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right) \cdot \frac{1}{\left|x\right|}\right)\right)
double f(double x) {
        double r4575710 = 1.0;
        double r4575711 = atan2(1.0, 0.0);
        double r4575712 = sqrt(r4575711);
        double r4575713 = r4575710 / r4575712;
        double r4575714 = x;
        double r4575715 = fabs(r4575714);
        double r4575716 = r4575715 * r4575715;
        double r4575717 = exp(r4575716);
        double r4575718 = r4575713 * r4575717;
        double r4575719 = r4575710 / r4575715;
        double r4575720 = 2.0;
        double r4575721 = r4575710 / r4575720;
        double r4575722 = r4575719 * r4575719;
        double r4575723 = r4575722 * r4575719;
        double r4575724 = r4575721 * r4575723;
        double r4575725 = r4575719 + r4575724;
        double r4575726 = 3.0;
        double r4575727 = 4.0;
        double r4575728 = r4575726 / r4575727;
        double r4575729 = r4575723 * r4575719;
        double r4575730 = r4575729 * r4575719;
        double r4575731 = r4575728 * r4575730;
        double r4575732 = r4575725 + r4575731;
        double r4575733 = 15.0;
        double r4575734 = 8.0;
        double r4575735 = r4575733 / r4575734;
        double r4575736 = r4575730 * r4575719;
        double r4575737 = r4575736 * r4575719;
        double r4575738 = r4575735 * r4575737;
        double r4575739 = r4575732 + r4575738;
        double r4575740 = r4575718 * r4575739;
        return r4575740;
}

Reproduce

herbie shell --seed 2019146 +o rules:numerics
(FPCore (x)
  :name "Jmat.Real.erfi, branch x greater than or equal to 5"
  (* (* (/ 1 (sqrt PI)) (exp (* (fabs x) (fabs x)))) (+ (+ (+ (/ 1 (fabs x)) (* (/ 1 2) (* (* (/ 1 (fabs x)) (/ 1 (fabs x))) (/ 1 (fabs x))))) (* (/ 3 4) (* (* (* (* (/ 1 (fabs x)) (/ 1 (fabs x))) (/ 1 (fabs x))) (/ 1 (fabs x))) (/ 1 (fabs x))))) (* (/ 15 8) (* (* (* (* (* (* (/ 1 (fabs x)) (/ 1 (fabs x))) (/ 1 (fabs x))) (/ 1 (fabs x))) (/ 1 (fabs x))) (/ 1 (fabs x))) (/ 1 (fabs x)))))))