Average Error: 15.1 → 1.2
Time: 9.9s
Precision: binary64
\[\frac{x \cdot y}{\left(z \cdot z\right) \cdot \left(z + 1\right)}\]
↓
\[\frac{\sqrt[3]{x} \cdot \sqrt[3]{x}}{\frac{z}{\frac{\sqrt[3]{y} \cdot \sqrt[3]{y}}{\sqrt[3]{z + 1} \cdot \sqrt[3]{z + 1}}}} \cdot \frac{\sqrt[3]{x}}{\frac{z}{\frac{\sqrt[3]{y}}{\sqrt[3]{z + 1}}}}\]
\frac{x \cdot y}{\left(z \cdot z\right) \cdot \left(z + 1\right)}
↓
\frac{\sqrt[3]{x} \cdot \sqrt[3]{x}}{\frac{z}{\frac{\sqrt[3]{y} \cdot \sqrt[3]{y}}{\sqrt[3]{z + 1} \cdot \sqrt[3]{z + 1}}}} \cdot \frac{\sqrt[3]{x}}{\frac{z}{\frac{\sqrt[3]{y}}{\sqrt[3]{z + 1}}}}
(FPCore (x y z) :precision binary64 (/ (* x y) (* (* z z) (+ z 1.0))))
↓
(FPCore (x y z)
 :precision binary64
 (*
  (/
   (* (cbrt x) (cbrt x))
   (/ z (/ (* (cbrt y) (cbrt y)) (* (cbrt (+ z 1.0)) (cbrt (+ z 1.0))))))
  (/ (cbrt x) (/ z (/ (cbrt y) (cbrt (+ z 1.0)))))))
double code(double x, double y, double z) {
	return (x * y) / ((z * z) * (z + 1.0));
}
↓
double code(double x, double y, double z) {
	return ((cbrt(x) * cbrt(x)) / (z / ((cbrt(y) * cbrt(y)) / (cbrt(z + 1.0) * cbrt(z + 1.0))))) * (cbrt(x) / (z / (cbrt(y) / cbrt(z + 1.0))));
}

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

Original15.1
Target4.0
Herbie1.2
\[\begin{array}{l} \mathbf{if}\;z < 249.6182814532307:\\ \;\;\;\;\frac{y \cdot \frac{x}{z}}{z + z \cdot z}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{\frac{y}{z}}{1 + z} \cdot x}{z}\\ \end{array}\]

Derivation

  1. Initial program 15.1

    \[\frac{x \cdot y}{\left(z \cdot z\right) \cdot \left(z + 1\right)}\]
  2. Using strategy rm

  3. Applied associate-/l*_binary64_1127613.7

    \[\leadsto \color{blue}{\frac{x}{\frac{\left(z \cdot z\right) \cdot \left(z + 1\right)}{y}}}\]

  4. Simplified11.9

    \[\leadsto \frac{x}{\color{blue}{\frac{z \cdot z}{\frac{y}{z + 1}}}}\]
  5. Using strategy rm

  6. Applied add-cube-cbrt_binary64_1136612.1

    \[\leadsto \frac{x}{\frac{z \cdot z}{\frac{y}{\color{blue}{\left(\sqrt[3]{z + 1} \cdot \sqrt[3]{z + 1}\right) \cdot \sqrt[3]{z + 1}}}}}\]

  7. Applied add-cube-cbrt_binary64_1136612.4

    \[\leadsto \frac{x}{\frac{z \cdot z}{\frac{\color{blue}{\left(\sqrt[3]{y} \cdot \sqrt[3]{y}\right) \cdot \sqrt[3]{y}}}{\left(\sqrt[3]{z + 1} \cdot \sqrt[3]{z + 1}\right) \cdot \sqrt[3]{z + 1}}}}\]

  8. Applied times-frac_binary64_1133712.3

    \[\leadsto \frac{x}{\frac{z \cdot z}{\color{blue}{\frac{\sqrt[3]{y} \cdot \sqrt[3]{y}}{\sqrt[3]{z + 1} \cdot \sqrt[3]{z + 1}} \cdot \frac{\sqrt[3]{y}}{\sqrt[3]{z + 1}}}}}\]

  9. Applied times-frac_binary64_113378.4

    \[\leadsto \frac{x}{\color{blue}{\frac{z}{\frac{\sqrt[3]{y} \cdot \sqrt[3]{y}}{\sqrt[3]{z + 1} \cdot \sqrt[3]{z + 1}}} \cdot \frac{z}{\frac{\sqrt[3]{y}}{\sqrt[3]{z + 1}}}}}\]

  10. Applied add-cube-cbrt_binary64_113668.5

    \[\leadsto \frac{\color{blue}{\left(\sqrt[3]{x} \cdot \sqrt[3]{x}\right) \cdot \sqrt[3]{x}}}{\frac{z}{\frac{\sqrt[3]{y} \cdot \sqrt[3]{y}}{\sqrt[3]{z + 1} \cdot \sqrt[3]{z + 1}}} \cdot \frac{z}{\frac{\sqrt[3]{y}}{\sqrt[3]{z + 1}}}}\]

  11. Applied times-frac_binary64_113371.2

    \[\leadsto \color{blue}{\frac{\sqrt[3]{x} \cdot \sqrt[3]{x}}{\frac{z}{\frac{\sqrt[3]{y} \cdot \sqrt[3]{y}}{\sqrt[3]{z + 1} \cdot \sqrt[3]{z + 1}}}} \cdot \frac{\sqrt[3]{x}}{\frac{z}{\frac{\sqrt[3]{y}}{\sqrt[3]{z + 1}}}}}\]

  12. Final simplification1.2

    \[\leadsto \frac{\sqrt[3]{x} \cdot \sqrt[3]{x}}{\frac{z}{\frac{\sqrt[3]{y} \cdot \sqrt[3]{y}}{\sqrt[3]{z + 1} \cdot \sqrt[3]{z + 1}}}} \cdot \frac{\sqrt[3]{x}}{\frac{z}{\frac{\sqrt[3]{y}}{\sqrt[3]{z + 1}}}}\]

Reproduce

herbie shell --seed 2020342 
(FPCore (x y z)
  :name "Statistics.Distribution.Beta:$cvariance from math-functions-0.1.5.2"
  :precision binary64

  :herbie-target
  (if (< z 249.6182814532307) (/ (* y (/ x z)) (+ z (* z z))) (/ (* (/ (/ y z) (+ 1.0 z)) x) z))

  (/ (* x y) (* (* z z) (+ z 1.0))))