Average Error: 18.6 → 1.2
Time: 3.3s
Precision: binary64
\[\frac{\left(-t1\right) \cdot v}{\left(t1 + u\right) \cdot \left(t1 + u\right)}\]
\[\left(t1 \cdot \left(\sqrt[3]{v} \cdot \frac{\sqrt[3]{v}}{t1 + u}\right)\right) \cdot \frac{\sqrt[3]{\sqrt[3]{v}} \cdot \left(\sqrt[3]{\sqrt[3]{v}} \cdot \sqrt[3]{\sqrt[3]{v}}\right)}{-\left(t1 + u\right)}\]

Error

Bits error versus u

Bits error versus v

Bits error versus t1

Derivation

  1. Initial program 18.6

    \[\frac{\left(-t1\right) \cdot v}{\left(t1 + u\right) \cdot \left(t1 + u\right)}\]
  2. Simplified18.3

    \[\leadsto \color{blue}{t1 \cdot \frac{v}{\left(t1 + u\right) \cdot \left(-\left(t1 + u\right)\right)}}\]
  3. Using strategy rm
  4. Applied add-cube-cbrt18.6

    \[\leadsto t1 \cdot \frac{\color{blue}{\left(\sqrt[3]{v} \cdot \sqrt[3]{v}\right) \cdot \sqrt[3]{v}}}{\left(t1 + u\right) \cdot \left(-\left(t1 + u\right)\right)}\]
  5. Applied times-frac11.9

    \[\leadsto t1 \cdot \color{blue}{\left(\frac{\sqrt[3]{v} \cdot \sqrt[3]{v}}{t1 + u} \cdot \frac{\sqrt[3]{v}}{-\left(t1 + u\right)}\right)}\]
  6. Applied associate-*r*1.0

    \[\leadsto \color{blue}{\left(t1 \cdot \frac{\sqrt[3]{v} \cdot \sqrt[3]{v}}{t1 + u}\right) \cdot \frac{\sqrt[3]{v}}{-\left(t1 + u\right)}}\]
  7. Simplified1.0

    \[\leadsto \color{blue}{\left(t1 \cdot \left(\sqrt[3]{v} \cdot \frac{\sqrt[3]{v}}{t1 + u}\right)\right)} \cdot \frac{\sqrt[3]{v}}{-\left(t1 + u\right)}\]
  8. Using strategy rm
  9. Applied add-cube-cbrt1.2

    \[\leadsto \left(t1 \cdot \left(\sqrt[3]{v} \cdot \frac{\sqrt[3]{v}}{t1 + u}\right)\right) \cdot \frac{\color{blue}{\left(\sqrt[3]{\sqrt[3]{v}} \cdot \sqrt[3]{\sqrt[3]{v}}\right) \cdot \sqrt[3]{\sqrt[3]{v}}}}{-\left(t1 + u\right)}\]
  10. Final simplification1.2

    \[\leadsto \left(t1 \cdot \left(\sqrt[3]{v} \cdot \frac{\sqrt[3]{v}}{t1 + u}\right)\right) \cdot \frac{\sqrt[3]{\sqrt[3]{v}} \cdot \left(\sqrt[3]{\sqrt[3]{v}} \cdot \sqrt[3]{\sqrt[3]{v}}\right)}{-\left(t1 + u\right)}\]

Reproduce

herbie shell --seed 2020179 
(FPCore (u v t1)
  :name "Rosa's DopplerBench"
  :precision binary64
  (/ (* (neg t1) v) (* (+ t1 u) (+ t1 u))))