Average Error: 0.0 → 0.1
Time: 46.8s
Precision: 64
Internal Precision: 128
\[\frac{1 + \frac{2 \cdot t}{1 + t} \cdot \frac{2 \cdot t}{1 + t}}{2 + \frac{2 \cdot t}{1 + t} \cdot \frac{2 \cdot t}{1 + t}}\]
\[\frac{(\left(\frac{t \cdot 2}{1 + t}\right) \cdot \left(\frac{t \cdot 2}{1 + t}\right) + 1)_*}{(\left(\frac{\sqrt[3]{\left(\frac{t \cdot 2}{1 + t} \cdot \frac{t \cdot 2}{1 + t}\right) \cdot \left(t \cdot 2\right)}}{\sqrt[3]{1 + t}}\right) \cdot \left(\frac{t \cdot 2}{1 + t}\right) + 2)_*}\]

Error

Bits error versus t

Derivation

  1. Initial program 0.0

    \[\frac{1 + \frac{2 \cdot t}{1 + t} \cdot \frac{2 \cdot t}{1 + t}}{2 + \frac{2 \cdot t}{1 + t} \cdot \frac{2 \cdot t}{1 + t}}\]
  2. Simplified0.0

    \[\leadsto \color{blue}{\frac{(\left(\frac{t \cdot 2}{1 + t}\right) \cdot \left(\frac{t \cdot 2}{1 + t}\right) + 1)_*}{(\left(\frac{t \cdot 2}{1 + t}\right) \cdot \left(\frac{t \cdot 2}{1 + t}\right) + 2)_*}}\]
  3. Using strategy rm
  4. Applied add-cbrt-cube0.0

    \[\leadsto \frac{(\left(\frac{t \cdot 2}{1 + t}\right) \cdot \left(\frac{t \cdot 2}{1 + t}\right) + 1)_*}{(\color{blue}{\left(\sqrt[3]{\left(\frac{t \cdot 2}{1 + t} \cdot \frac{t \cdot 2}{1 + t}\right) \cdot \frac{t \cdot 2}{1 + t}}\right)} \cdot \left(\frac{t \cdot 2}{1 + t}\right) + 2)_*}\]
  5. Using strategy rm
  6. Applied associate-*r/0.1

    \[\leadsto \frac{(\left(\frac{t \cdot 2}{1 + t}\right) \cdot \left(\frac{t \cdot 2}{1 + t}\right) + 1)_*}{(\left(\sqrt[3]{\color{blue}{\frac{\left(\frac{t \cdot 2}{1 + t} \cdot \frac{t \cdot 2}{1 + t}\right) \cdot \left(t \cdot 2\right)}{1 + t}}}\right) \cdot \left(\frac{t \cdot 2}{1 + t}\right) + 2)_*}\]
  7. Applied cbrt-div0.1

    \[\leadsto \frac{(\left(\frac{t \cdot 2}{1 + t}\right) \cdot \left(\frac{t \cdot 2}{1 + t}\right) + 1)_*}{(\color{blue}{\left(\frac{\sqrt[3]{\left(\frac{t \cdot 2}{1 + t} \cdot \frac{t \cdot 2}{1 + t}\right) \cdot \left(t \cdot 2\right)}}{\sqrt[3]{1 + t}}\right)} \cdot \left(\frac{t \cdot 2}{1 + t}\right) + 2)_*}\]
  8. Final simplification0.1

    \[\leadsto \frac{(\left(\frac{t \cdot 2}{1 + t}\right) \cdot \left(\frac{t \cdot 2}{1 + t}\right) + 1)_*}{(\left(\frac{\sqrt[3]{\left(\frac{t \cdot 2}{1 + t} \cdot \frac{t \cdot 2}{1 + t}\right) \cdot \left(t \cdot 2\right)}}{\sqrt[3]{1 + t}}\right) \cdot \left(\frac{t \cdot 2}{1 + t}\right) + 2)_*}\]

Reproduce

herbie shell --seed 2019093 +o rules:numerics
(FPCore (t)
  :name "Kahan p13 Example 1"
  (/ (+ 1 (* (/ (* 2 t) (+ 1 t)) (/ (* 2 t) (+ 1 t)))) (+ 2 (* (/ (* 2 t) (+ 1 t)) (/ (* 2 t) (+ 1 t))))))