Average Error: 0.0 → 0.0
Time: 5.2s
Precision: binary64
\[\left(\frac{1}{8} \cdot x - \frac{y \cdot z}{2}\right) + t\]
↓
\[z \cdot \left(y \cdot -0.5\right) + \left(0.125 \cdot x + t\right)\]
\left(\frac{1}{8} \cdot x - \frac{y \cdot z}{2}\right) + t
↓
z \cdot \left(y \cdot -0.5\right) + \left(0.125 \cdot x + t\right)
(FPCore (x y z t)
 :precision binary64
 (+ (- (* (/ 1.0 8.0) x) (/ (* y z) 2.0)) t))
↓
(FPCore (x y z t) :precision binary64 (+ (* z (* y -0.5)) (+ (* 0.125 x) t)))
double code(double x, double y, double z, double t) {
	return (((1.0 / 8.0) * x) - ((y * z) / 2.0)) + t;
}
↓
double code(double x, double y, double z, double t) {
	return (z * (y * -0.5)) + ((0.125 * x) + t);
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Bits error versus t

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original0.0
Target0.0
Herbie0.0
\[\left(\frac{x}{8} + t\right) - \frac{z}{2} \cdot y\]

Derivation

  1. Initial program 0.0

    \[\left(\frac{1}{8} \cdot x - \frac{y \cdot z}{2}\right) + t\]

  2. Simplified0.0

    \[\leadsto \color{blue}{\left(0.125 \cdot x - \frac{y \cdot z}{2}\right) + t}\]

  3. Taylor expanded around 0 0.0

    \[\leadsto \color{blue}{\left(t + 0.125 \cdot x\right) - 0.5 \cdot \left(z \cdot y\right)}\]

  4. Simplified0.0

    \[\leadsto \color{blue}{-0.5 \cdot \left(z \cdot y\right) + \left(0.125 \cdot x + t\right)}\]
  5. Using strategy rm

  6. Applied add-sqr-sqrt_binary6427.8

    \[\leadsto \color{blue}{\sqrt{-0.5 \cdot \left(z \cdot y\right)} \cdot \sqrt{-0.5 \cdot \left(z \cdot y\right)}} + \left(0.125 \cdot x + t\right)\]

  7. Simplified27.8

    \[\leadsto \color{blue}{\sqrt{\left(z \cdot y\right) \cdot -0.5}} \cdot \sqrt{-0.5 \cdot \left(z \cdot y\right)} + \left(0.125 \cdot x + t\right)\]

  8. Simplified27.8

    \[\leadsto \sqrt{\left(z \cdot y\right) \cdot -0.5} \cdot \color{blue}{\sqrt{\left(z \cdot y\right) \cdot -0.5}} + \left(0.125 \cdot x + t\right)\]

  9. Taylor expanded around -inf 0.4

    \[\leadsto \color{blue}{-1 \cdot \left({\left(\sqrt{0.5}\right)}^{2} \cdot \left(z \cdot y\right)\right)} + \left(0.125 \cdot x + t\right)\]

  10. Simplified0.0

    \[\leadsto \color{blue}{z \cdot \left(y \cdot -0.5\right)} + \left(0.125 \cdot x + t\right)\]

  11. Final simplification0.0

    \[\leadsto z \cdot \left(y \cdot -0.5\right) + \left(0.125 \cdot x + t\right)\]

Alternatives

Reproduce

herbie shell --seed 2021118 
(FPCore (x y z t)
  :name "Diagrams.Solve.Polynomial:quartForm  from diagrams-solve-0.1, B"
  :precision binary64

  :herbie-target
  (- (+ (/ x 8.0) t) (* (/ z 2.0) y))

  (+ (- (* (/ 1.0 8.0) x) (/ (* y z) 2.0)) t))