Average Error: 12.7 → 0.6
Time: 6.0s
Precision: binary64
\[\left(\left(3 + \frac{2}{r \cdot r}\right) - \frac{\left(0.125 \cdot \left(3 - 2 \cdot v\right)\right) \cdot \left(\left(\left(w \cdot w\right) \cdot r\right) \cdot r\right)}{1 - v}\right) - 4.5\]
↓
\[\left(\frac{\frac{2}{r}}{r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \left(\left(r \cdot w\right) \cdot \left(w \cdot \frac{r}{1 - v}\right)\right)\]
\left(\left(3 + \frac{2}{r \cdot r}\right) - \frac{\left(0.125 \cdot \left(3 - 2 \cdot v\right)\right) \cdot \left(\left(\left(w \cdot w\right) \cdot r\right) \cdot r\right)}{1 - v}\right) - 4.5
↓
\left(\frac{\frac{2}{r}}{r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \left(\left(r \cdot w\right) \cdot \left(w \cdot \frac{r}{1 - v}\right)\right)
(FPCore (v w r)
 :precision binary64
 (-
  (-
   (+ 3.0 (/ 2.0 (* r r)))
   (/ (* (* 0.125 (- 3.0 (* 2.0 v))) (* (* (* w w) r) r)) (- 1.0 v)))
  4.5))
↓
(FPCore (v w r)
 :precision binary64
 (-
  (+ (/ (/ 2.0 r) r) -1.5)
  (* (- 0.375 (* v 0.25)) (* (* r w) (* w (/ r (- 1.0 v)))))))
double code(double v, double w, double r) {
	return ((3.0 + (2.0 / (r * r))) - (((0.125 * (3.0 - (2.0 * v))) * (((w * w) * r) * r)) / (1.0 - v))) - 4.5;
}
↓
double code(double v, double w, double r) {
	return (((2.0 / r) / r) + -1.5) - ((0.375 - (v * 0.25)) * ((r * w) * (w * (r / (1.0 - v)))));
}

Error

Bits error versus v

Bits error versus w

Bits error versus r

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 12.7

    \[\left(\left(3 + \frac{2}{r \cdot r}\right) - \frac{\left(0.125 \cdot \left(3 - 2 \cdot v\right)\right) \cdot \left(\left(\left(w \cdot w\right) \cdot r\right) \cdot r\right)}{1 - v}\right) - 4.5\]

  2. Simplified8.8

    \[\leadsto \color{blue}{\left(\frac{2}{r \cdot r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \frac{r}{\frac{1 - v}{r \cdot \left(w \cdot w\right)}}}\]
  3. Using strategy rm

  4. Applied associate-*r*_binary643.9

    \[\leadsto \left(\frac{2}{r \cdot r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \frac{r}{\frac{1 - v}{\color{blue}{\left(r \cdot w\right) \cdot w}}}\]
  5. Using strategy rm

  6. Applied *-un-lft-identity_binary643.9

    \[\leadsto \left(\frac{2}{r \cdot r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \frac{r}{\frac{1 - \color{blue}{1 \cdot v}}{\left(r \cdot w\right) \cdot w}}\]

  7. Applied *-un-lft-identity_binary643.9

    \[\leadsto \left(\frac{2}{r \cdot r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \frac{r}{\frac{\color{blue}{1 \cdot 1} - 1 \cdot v}{\left(r \cdot w\right) \cdot w}}\]

  8. Applied distribute-lft-out--_binary643.9

    \[\leadsto \left(\frac{2}{r \cdot r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \frac{r}{\frac{\color{blue}{1 \cdot \left(1 - v\right)}}{\left(r \cdot w\right) \cdot w}}\]

  9. Applied times-frac_binary643.8

    \[\leadsto \left(\frac{2}{r \cdot r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \frac{r}{\color{blue}{\frac{1}{r \cdot w} \cdot \frac{1 - v}{w}}}\]

  10. Applied *-un-lft-identity_binary643.8

    \[\leadsto \left(\frac{2}{r \cdot r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \frac{\color{blue}{1 \cdot r}}{\frac{1}{r \cdot w} \cdot \frac{1 - v}{w}}\]

  11. Applied times-frac_binary642.8

    \[\leadsto \left(\frac{2}{r \cdot r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \color{blue}{\left(\frac{1}{\frac{1}{r \cdot w}} \cdot \frac{r}{\frac{1 - v}{w}}\right)}\]

  12. Simplified2.8

    \[\leadsto \left(\frac{2}{r \cdot r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \left(\color{blue}{\left(r \cdot w\right)} \cdot \frac{r}{\frac{1 - v}{w}}\right)\]

  13. Simplified0.6

    \[\leadsto \left(\frac{2}{r \cdot r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \left(\left(r \cdot w\right) \cdot \color{blue}{\left(w \cdot \frac{r}{1 - v}\right)}\right)\]
  14. Using strategy rm

  15. Applied associate-/r*_binary640.6

    \[\leadsto \left(\color{blue}{\frac{\frac{2}{r}}{r}} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \left(\left(r \cdot w\right) \cdot \left(w \cdot \frac{r}{1 - v}\right)\right)\]

  16. Final simplification0.6

    \[\leadsto \left(\frac{\frac{2}{r}}{r} + -1.5\right) - \left(0.375 - v \cdot 0.25\right) \cdot \left(\left(r \cdot w\right) \cdot \left(w \cdot \frac{r}{1 - v}\right)\right)\]

Reproduce

herbie shell --seed 2020288 
(FPCore (v w r)
  :name "Rosa's TurbineBenchmark"
  :precision binary64
  (- (- (+ 3.0 (/ 2.0 (* r r))) (/ (* (* 0.125 (- 3.0 (* 2.0 v))) (* (* (* w w) r) r)) (- 1.0 v))) 4.5))