Average Error: 16.1 → 6.4
Time: 4.6s
Precision: binary64
\[\left(x + y\right) - \frac{\left(z - t\right) \cdot y}{a - t}\]
↓
\[\begin{array}{l} \mathbf{if}\;\left(x + y\right) - \frac{y \cdot \left(z - t\right)}{a - t} \le -1.9886159547609932 \cdot 10^{-221} \lor \neg \left(\left(x + y\right) - \frac{y \cdot \left(z - t\right)}{a - t} \le 0.0\right):\\ \;\;\;\;x + \left(y + y \cdot \frac{t - z}{a - t}\right)\\ \mathbf{else}:\\ \;\;\;\;x + y \cdot \frac{z}{t}\\ \end{array}\]
\left(x + y\right) - \frac{\left(z - t\right) \cdot y}{a - t}
↓
\begin{array}{l}
\mathbf{if}\;\left(x + y\right) - \frac{y \cdot \left(z - t\right)}{a - t} \le -1.9886159547609932 \cdot 10^{-221} \lor \neg \left(\left(x + y\right) - \frac{y \cdot \left(z - t\right)}{a - t} \le 0.0\right):\\
\;\;\;\;x + \left(y + y \cdot \frac{t - z}{a - t}\right)\\

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

\end{array}
double code(double x, double y, double z, double t, double a) {
	return ((double) (((double) (x + y)) - ((double) (((double) (((double) (z - t)) * y)) / ((double) (a - t))))));
}
↓
double code(double x, double y, double z, double t, double a) {
	double VAR;
	if (((((double) (((double) (x + y)) - ((double) (((double) (y * ((double) (z - t)))) / ((double) (a - t)))))) <= -1.9886159547609932e-221) || !(((double) (((double) (x + y)) - ((double) (((double) (y * ((double) (z - t)))) / ((double) (a - t)))))) <= 0.0))) {
		VAR = ((double) (x + ((double) (y + ((double) (y * ((double) (((double) (t - z)) / ((double) (a - t))))))))));
	} else {
		VAR = ((double) (x + ((double) (y * ((double) (z / t))))));
	}
	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

Original16.1
Target8.2
Herbie6.4
\[\begin{array}{l} \mathbf{if}\;\left(x + y\right) - \frac{\left(z - t\right) \cdot y}{a - t} \lt -1.3664970889390727 \cdot 10^{-7}:\\ \;\;\;\;\left(y + x\right) - \left(\left(z - t\right) \cdot \frac{1}{a - t}\right) \cdot y\\ \mathbf{elif}\;\left(x + y\right) - \frac{\left(z - t\right) \cdot y}{a - t} \lt 1.47542934445772333 \cdot 10^{-239}:\\ \;\;\;\;\frac{y \cdot \left(a - z\right) - x \cdot t}{a - t}\\ \mathbf{else}:\\ \;\;\;\;\left(y + x\right) - \left(\left(z - t\right) \cdot \frac{1}{a - t}\right) \cdot y\\ \end{array}\]

Derivation

  1. Split input into 2 regimes

  2. if (- (+ x y) (/ (* (- z t) y) (- a t))) < -1.9886159547609932e-221 or 0.0 < (- (+ x y) (/ (* (- z t) y) (- a t)))

    1. Initial program 12.4

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

    2. Simplified5.1

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

    if -1.9886159547609932e-221 < (- (+ x y) (/ (* (- z t) y) (- a t))) < 0.0

    1. Initial program 56.7

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

    2. Simplified35.4

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

    3. Taylor expanded around inf 20.6

      \[\leadsto x + \color{blue}{\frac{z \cdot y}{t}}\]

    4. Simplified20.7

      \[\leadsto x + \color{blue}{\frac{z}{t} \cdot y}\]
  3. Recombined 2 regimes into one program.

  4. Final simplification6.4

    \[\leadsto \begin{array}{l} \mathbf{if}\;\left(x + y\right) - \frac{y \cdot \left(z - t\right)}{a - t} \le -1.9886159547609932 \cdot 10^{-221} \lor \neg \left(\left(x + y\right) - \frac{y \cdot \left(z - t\right)}{a - t} \le 0.0\right):\\ \;\;\;\;x + \left(y + y \cdot \frac{t - z}{a - t}\right)\\ \mathbf{else}:\\ \;\;\;\;x + y \cdot \frac{z}{t}\\ \end{array}\]

Reproduce

herbie shell --seed 2020184 
(FPCore (x y z t a)
  :name "Graphics.Rendering.Plot.Render.Plot.Axis:renderAxisTick from plot-0.2.3.4, B"
  :precision binary64

  :herbie-target
  (if (< (- (+ x y) (/ (* (- z t) y) (- a t))) -1.3664970889390727e-07) (- (+ y x) (* (* (- z t) (/ 1.0 (- a t))) y)) (if (< (- (+ x y) (/ (* (- z t) y) (- a t))) 1.4754293444577233e-239) (/ (- (* y (- a z)) (* x t)) (- a t)) (- (+ y x) (* (* (- z t) (/ 1.0 (- a t))) y))))

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