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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 r4837095 = 1.0;
        double r4837096 = atan2(1.0, 0.0);
        double r4837097 = sqrt(r4837096);
        double r4837098 = r4837095 / r4837097;
        double r4837099 = x;
        double r4837100 = fabs(r4837099);
        double r4837101 = r4837100 * r4837100;
        double r4837102 = exp(r4837101);
        double r4837103 = r4837098 * r4837102;
        double r4837104 = r4837095 / r4837100;
        double r4837105 = 2.0;
        double r4837106 = r4837095 / r4837105;
        double r4837107 = r4837104 * r4837104;
        double r4837108 = r4837107 * r4837104;
        double r4837109 = r4837106 * r4837108;
        double r4837110 = r4837104 + r4837109;
        double r4837111 = 3.0;
        double r4837112 = 4.0;
        double r4837113 = r4837111 / r4837112;
        double r4837114 = r4837108 * r4837104;
        double r4837115 = r4837114 * r4837104;
        double r4837116 = r4837113 * r4837115;
        double r4837117 = r4837110 + r4837116;
        double r4837118 = 15.0;
        double r4837119 = 8.0;
        double r4837120 = r4837118 / r4837119;
        double r4837121 = r4837115 * r4837104;
        double r4837122 = r4837121 * r4837104;
        double r4837123 = r4837120 * r4837122;
        double r4837124 = r4837117 + r4837123;
        double r4837125 = r4837103 * r4837124;
        return r4837125;
}

Reproduce

herbie shell --seed 2019158 
(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)))))))