Average Error: 5.8 → 0.9
Time: 9.7s
Precision: 64
\[x + \frac{e^{y \cdot \log \left(\frac{y}{z + y}\right)}}{y}\]
↓
\[x + \frac{{\left(e^{\sqrt[3]{y} \cdot \sqrt[3]{y}}\right)}^{\left(\sqrt[3]{y} \cdot \log \left(\frac{y}{z + y}\right)\right)}}{y}\]
x + \frac{e^{y \cdot \log \left(\frac{y}{z + y}\right)}}{y}
↓
x + \frac{{\left(e^{\sqrt[3]{y} \cdot \sqrt[3]{y}}\right)}^{\left(\sqrt[3]{y} \cdot \log \left(\frac{y}{z + y}\right)\right)}}{y}
double f(double x, double y, double z) {
        double r568609 = x;
        double r568610 = y;
        double r568611 = z;
        double r568612 = r568611 + r568610;
        double r568613 = r568610 / r568612;
        double r568614 = log(r568613);
        double r568615 = r568610 * r568614;
        double r568616 = exp(r568615);
        double r568617 = r568616 / r568610;
        double r568618 = r568609 + r568617;
        return r568618;
}
↓
double f(double x, double y, double z) {
        double r568619 = x;
        double r568620 = y;
        double r568621 = cbrt(r568620);
        double r568622 = r568621 * r568621;
        double r568623 = exp(r568622);
        double r568624 = z;
        double r568625 = r568624 + r568620;
        double r568626 = r568620 / r568625;
        double r568627 = log(r568626);
        double r568628 = r568621 * r568627;
        double r568629 = pow(r568623, r568628);
        double r568630 = r568629 / r568620;
        double r568631 = r568619 + r568630;
        return r568631;
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original5.8
Target0.9
Herbie0.9
\[\begin{array}{l} \mathbf{if}\;\frac{y}{z + y} \lt 7.1154157598 \cdot 10^{-315}:\\ \;\;\;\;x + \frac{e^{\frac{-1}{z}}}{y}\\ \mathbf{else}:\\ \;\;\;\;x + \frac{e^{\log \left({\left(\frac{y}{y + z}\right)}^{y}\right)}}{y}\\ \end{array}\]

Derivation

  1. Initial program 5.8

    \[x + \frac{e^{y \cdot \log \left(\frac{y}{z + y}\right)}}{y}\]
  2. Using strategy rm

  3. Applied add-log-exp34.8

    \[\leadsto x + \frac{e^{\color{blue}{\log \left(e^{y}\right)} \cdot \log \left(\frac{y}{z + y}\right)}}{y}\]

  4. Applied exp-to-pow0.9

    \[\leadsto x + \frac{\color{blue}{{\left(e^{y}\right)}^{\left(\log \left(\frac{y}{z + y}\right)\right)}}}{y}\]
  5. Using strategy rm

  6. Applied add-cube-cbrt0.9

    \[\leadsto x + \frac{{\left(e^{\color{blue}{\left(\sqrt[3]{y} \cdot \sqrt[3]{y}\right) \cdot \sqrt[3]{y}}}\right)}^{\left(\log \left(\frac{y}{z + y}\right)\right)}}{y}\]

  7. Applied exp-prod0.9

    \[\leadsto x + \frac{{\color{blue}{\left({\left(e^{\sqrt[3]{y} \cdot \sqrt[3]{y}}\right)}^{\left(\sqrt[3]{y}\right)}\right)}}^{\left(\log \left(\frac{y}{z + y}\right)\right)}}{y}\]

  8. Applied pow-pow0.9

    \[\leadsto x + \frac{\color{blue}{{\left(e^{\sqrt[3]{y} \cdot \sqrt[3]{y}}\right)}^{\left(\sqrt[3]{y} \cdot \log \left(\frac{y}{z + y}\right)\right)}}}{y}\]

  9. Final simplification0.9

    \[\leadsto x + \frac{{\left(e^{\sqrt[3]{y} \cdot \sqrt[3]{y}}\right)}^{\left(\sqrt[3]{y} \cdot \log \left(\frac{y}{z + y}\right)\right)}}{y}\]

Reproduce

herbie shell --seed 2020047 
(FPCore (x y z)
  :name "Numeric.SpecFunctions:invIncompleteBetaWorker from math-functions-0.1.5.2, G"
  :precision binary64

  :herbie-target
  (if (< (/ y (+ z y)) 7.1154157597908e-315) (+ x (/ (exp (/ -1 z)) y)) (+ x (/ (exp (log (pow (/ y (+ y z)) y))) y)))

  (+ x (/ (exp (* y (log (/ y (+ z y))))) y)))