Average Error: 7.5 → 6.3
Time: 7.2s
Precision: binary64
\[\frac{x \cdot y - z \cdot t}{a}\]
↓
\[\begin{array}{l} \mathbf{if}\;\frac{x \cdot y - z \cdot t}{a} = -inf.0:\\ \;\;\;\;\left(\frac{y}{\frac{{a}^{\frac{2}{3}}}{x}} - \frac{t}{\frac{{a}^{\frac{2}{3}}}{z}}\right) \cdot \frac{1}{\sqrt[3]{a}}\\ \mathbf{else}:\\ \;\;\;\;\frac{x \cdot y - z \cdot t}{a}\\ \end{array}\]
\frac{x \cdot y - z \cdot t}{a}
↓
\begin{array}{l}
\mathbf{if}\;\frac{x \cdot y - z \cdot t}{a} = -inf.0:\\
\;\;\;\;\left(\frac{y}{\frac{{a}^{\frac{2}{3}}}{x}} - \frac{t}{\frac{{a}^{\frac{2}{3}}}{z}}\right) \cdot \frac{1}{\sqrt[3]{a}}\\

\mathbf{else}:\\
\;\;\;\;\frac{x \cdot y - z \cdot t}{a}\\

\end{array}
double code(double x, double y, double z, double t, double a) {
	return ((double) (((double) (((double) (x * y)) - ((double) (z * t)))) / a));
}
↓
double code(double x, double y, double z, double t, double a) {
	double VAR;
	if ((((double) (((double) (((double) (x * y)) - ((double) (z * t)))) / a)) <= -inf.0)) {
		VAR = ((double) (((double) (((double) (y / ((double) (((double) pow(a, 0.6666666666666666)) / x)))) - ((double) (t / ((double) (((double) pow(a, 0.6666666666666666)) / z)))))) * ((double) (1.0 / ((double) cbrt(a))))));
	} else {
		VAR = ((double) (((double) (((double) (x * y)) - ((double) (z * t)))) / a));
	}
	return VAR;
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Bits error versus t

Bits error versus a

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original7.5
Target5.8
Herbie6.3
\[\begin{array}{l} \mathbf{if}\;z \lt -2.46868496869954822 \cdot 10^{170}:\\ \;\;\;\;\frac{y}{a} \cdot x - \frac{t}{a} \cdot z\\ \mathbf{elif}\;z \lt 6.30983112197837121 \cdot 10^{-71}:\\ \;\;\;\;\frac{x \cdot y - z \cdot t}{a}\\ \mathbf{else}:\\ \;\;\;\;\frac{y}{a} \cdot x - \frac{t}{a} \cdot z\\ \end{array}\]

Derivation

  1. Split input into 2 regimes

  2. if (/ (- (* x y) (* z t)) a) < -inf.0

    1. Initial program 64.0

      \[\frac{x \cdot y - z \cdot t}{a}\]
    2. Using strategy rm

    3. Applied div-inv64.0

      \[\leadsto \color{blue}{\left(x \cdot y - z \cdot t\right) \cdot \frac{1}{a}}\]
    4. Using strategy rm

    5. Applied add-cube-cbrt64.0

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

    6. Applied *-un-lft-identity64.0

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

    7. Applied times-frac64.0

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

    8. Applied associate-*r*64.0

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

    9. Simplified64.0

      \[\leadsto \color{blue}{\frac{x \cdot y - z \cdot t}{\sqrt[3]{a} \cdot \sqrt[3]{a}}} \cdot \frac{1}{\sqrt[3]{a}}\]
    10. Using strategy rm

    11. Applied div-sub64.0

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

    12. Simplified54.4

      \[\leadsto \left(\color{blue}{\frac{y}{\frac{{a}^{\frac{2}{3}}}{x}}} - \frac{z \cdot t}{\sqrt[3]{a} \cdot \sqrt[3]{a}}\right) \cdot \frac{1}{\sqrt[3]{a}}\]

    13. Simplified41.1

      \[\leadsto \left(\frac{y}{\frac{{a}^{\frac{2}{3}}}{x}} - \color{blue}{\frac{t}{\frac{{a}^{\frac{2}{3}}}{z}}}\right) \cdot \frac{1}{\sqrt[3]{a}}\]

    if -inf.0 < (/ (- (* x y) (* z t)) a)

    1. Initial program 4.4

      \[\frac{x \cdot y - z \cdot t}{a}\]
  3. Recombined 2 regimes into one program.

  4. Final simplification6.3

    \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{x \cdot y - z \cdot t}{a} = -inf.0:\\ \;\;\;\;\left(\frac{y}{\frac{{a}^{\frac{2}{3}}}{x}} - \frac{t}{\frac{{a}^{\frac{2}{3}}}{z}}\right) \cdot \frac{1}{\sqrt[3]{a}}\\ \mathbf{else}:\\ \;\;\;\;\frac{x \cdot y - z \cdot t}{a}\\ \end{array}\]

Reproduce

herbie shell --seed 2020147 
(FPCore (x y z t a)
  :name "Data.Colour.Matrix:inverse from colour-2.3.3, B"
  :precision binary64

  :herbie-target
  (if (< z -2.468684968699548e+170) (- (* (/ y a) x) (* (/ t a) z)) (if (< z 6.309831121978371e-71) (/ (- (* x y) (* z t)) a) (- (* (/ y a) x) (* (/ t a) z))))

  (/ (- (* x y) (* z t)) a))