Timeout in 10.0m

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\[0.0 \lt c_p \land 0.0 \lt c_n\]
\[\frac{{\left(\frac{1}{1 + e^{-s}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-s}}\right)}^{c_n}}{{\left(\frac{1}{1 + e^{-t}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-t}}\right)}^{c_n}}\]
\frac{{\left(\frac{1}{1 + e^{-s}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-s}}\right)}^{c_n}}{{\left(\frac{1}{1 + e^{-t}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-t}}\right)}^{c_n}}
double f(double c_p, double c_n, double t, double s) {
        double r133474 = 1.0;
        double r133475 = s;
        double r133476 = -r133475;
        double r133477 = exp(r133476);
        double r133478 = r133474 + r133477;
        double r133479 = r133474 / r133478;
        double r133480 = c_p;
        double r133481 = pow(r133479, r133480);
        double r133482 = r133474 - r133479;
        double r133483 = c_n;
        double r133484 = pow(r133482, r133483);
        double r133485 = r133481 * r133484;
        double r133486 = t;
        double r133487 = -r133486;
        double r133488 = exp(r133487);
        double r133489 = r133474 + r133488;
        double r133490 = r133474 / r133489;
        double r133491 = pow(r133490, r133480);
        double r133492 = r133474 - r133490;
        double r133493 = pow(r133492, r133483);
        double r133494 = r133491 * r133493;
        double r133495 = r133485 / r133494;
        return r133495;
}

Reproduce

herbie shell --seed 2019303 
(FPCore (c_p c_n t s)
  :name "Harley's example"
  :precision binary64
  :pre (and (< 0.0 c_p) (< 0.0 c_n))

  :herbie-target
  (* (pow (/ (+ 1 (exp (- t))) (+ 1 (exp (- s)))) c_p) (pow (/ (+ 1 (exp t)) (+ 1 (exp s))) c_n))

  (/ (* (pow (/ 1 (+ 1 (exp (- s)))) c_p) (pow (- 1 (/ 1 (+ 1 (exp (- s))))) c_n)) (* (pow (/ 1 (+ 1 (exp (- t)))) c_p) (pow (- 1 (/ 1 (+ 1 (exp (- t))))) c_n))))