Average Error: 6.3 → 1.5
Time: 13.2s
Precision: 64
\[x - \frac{y \cdot \left(z - t\right)}{a}\]
↓
\[x - \frac{\frac{y}{\frac{\sqrt[3]{a}}{\sqrt[3]{z - t}} \cdot \frac{\sqrt[3]{a}}{\sqrt[3]{z - t}}}}{\frac{\sqrt[3]{a}}{\sqrt[3]{z - t}}}\]
x - \frac{y \cdot \left(z - t\right)}{a}
↓
x - \frac{\frac{y}{\frac{\sqrt[3]{a}}{\sqrt[3]{z - t}} \cdot \frac{\sqrt[3]{a}}{\sqrt[3]{z - t}}}}{\frac{\sqrt[3]{a}}{\sqrt[3]{z - t}}}
double f(double x, double y, double z, double t, double a) {
        double r17490347 = x;
        double r17490348 = y;
        double r17490349 = z;
        double r17490350 = t;
        double r17490351 = r17490349 - r17490350;
        double r17490352 = r17490348 * r17490351;
        double r17490353 = a;
        double r17490354 = r17490352 / r17490353;
        double r17490355 = r17490347 - r17490354;
        return r17490355;
}
↓
double f(double x, double y, double z, double t, double a) {
        double r17490356 = x;
        double r17490357 = y;
        double r17490358 = a;
        double r17490359 = cbrt(r17490358);
        double r17490360 = z;
        double r17490361 = t;
        double r17490362 = r17490360 - r17490361;
        double r17490363 = cbrt(r17490362);
        double r17490364 = r17490359 / r17490363;
        double r17490365 = r17490364 * r17490364;
        double r17490366 = r17490357 / r17490365;
        double r17490367 = r17490366 / r17490364;
        double r17490368 = r17490356 - r17490367;
        return r17490368;
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Bits error versus t

Bits error versus a

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original6.3
Target0.6
Herbie1.5
\[\begin{array}{l} \mathbf{if}\;y \lt -1.07612662163899753216593153715602325729 \cdot 10^{-10}:\\ \;\;\;\;x - \frac{1}{\frac{\frac{a}{z - t}}{y}}\\ \mathbf{elif}\;y \lt 2.894426862792089097262541964056085749132 \cdot 10^{-49}:\\ \;\;\;\;x - \frac{y \cdot \left(z - t\right)}{a}\\ \mathbf{else}:\\ \;\;\;\;x - \frac{y}{\frac{a}{z - t}}\\ \end{array}\]

Derivation

  1. Initial program 6.3

    \[x - \frac{y \cdot \left(z - t\right)}{a}\]
  2. Using strategy rm

  3. Applied associate-/l*5.8

    \[\leadsto x - \color{blue}{\frac{y}{\frac{a}{z - t}}}\]
  4. Using strategy rm

  5. Applied add-cube-cbrt6.2

    \[\leadsto x - \frac{y}{\frac{a}{\color{blue}{\left(\sqrt[3]{z - t} \cdot \sqrt[3]{z - t}\right) \cdot \sqrt[3]{z - t}}}}\]

  6. Applied add-cube-cbrt6.4

    \[\leadsto x - \frac{y}{\frac{\color{blue}{\left(\sqrt[3]{a} \cdot \sqrt[3]{a}\right) \cdot \sqrt[3]{a}}}{\left(\sqrt[3]{z - t} \cdot \sqrt[3]{z - t}\right) \cdot \sqrt[3]{z - t}}}\]

  7. Applied times-frac6.4

    \[\leadsto x - \frac{y}{\color{blue}{\frac{\sqrt[3]{a} \cdot \sqrt[3]{a}}{\sqrt[3]{z - t} \cdot \sqrt[3]{z - t}} \cdot \frac{\sqrt[3]{a}}{\sqrt[3]{z - t}}}}\]

  8. Applied associate-/r*1.5

    \[\leadsto x - \color{blue}{\frac{\frac{y}{\frac{\sqrt[3]{a} \cdot \sqrt[3]{a}}{\sqrt[3]{z - t} \cdot \sqrt[3]{z - t}}}}{\frac{\sqrt[3]{a}}{\sqrt[3]{z - t}}}}\]

  9. Simplified1.5

    \[\leadsto x - \frac{\color{blue}{\frac{y}{\frac{\sqrt[3]{a}}{\sqrt[3]{z - t}} \cdot \frac{\sqrt[3]{a}}{\sqrt[3]{z - t}}}}}{\frac{\sqrt[3]{a}}{\sqrt[3]{z - t}}}\]

  10. Final simplification1.5

    \[\leadsto x - \frac{\frac{y}{\frac{\sqrt[3]{a}}{\sqrt[3]{z - t}} \cdot \frac{\sqrt[3]{a}}{\sqrt[3]{z - t}}}}{\frac{\sqrt[3]{a}}{\sqrt[3]{z - t}}}\]

Reproduce

herbie shell --seed 2019174 
(FPCore (x y z t a)
  :name "Optimisation.CirclePacking:place from circle-packing-0.1.0.4, F"

  :herbie-target
  (if (< y -1.0761266216389975e-10) (- x (/ 1.0 (/ (/ a (- z t)) y))) (if (< y 2.894426862792089e-49) (- x (/ (* y (- z t)) a)) (- x (/ y (/ a (- z t))))))

  (- x (/ (* y (- z t)) a)))