Average Error: 2.2 → 1.8
Time: 2.8s
Precision: binary64
\[\frac{x - y}{z - y} \cdot t\]
↓
\[\begin{array}{l} \mathbf{if}\;y \leq -1.030146493336082 \cdot 10^{-190} \lor \neg \left(y \leq 1.89196712684249 \cdot 10^{-129}\right):\\ \;\;\;\;\frac{x - y}{z - y} \cdot t\\ \mathbf{else}:\\ \;\;\;\;\left(\sqrt[3]{x - y} \cdot \sqrt[3]{x - y}\right) \cdot \left(t \cdot \frac{\sqrt[3]{x - y}}{z - y}\right)\\ \end{array}\]
\frac{x - y}{z - y} \cdot t
↓
\begin{array}{l}
\mathbf{if}\;y \leq -1.030146493336082 \cdot 10^{-190} \lor \neg \left(y \leq 1.89196712684249 \cdot 10^{-129}\right):\\
\;\;\;\;\frac{x - y}{z - y} \cdot t\\

\mathbf{else}:\\
\;\;\;\;\left(\sqrt[3]{x - y} \cdot \sqrt[3]{x - y}\right) \cdot \left(t \cdot \frac{\sqrt[3]{x - y}}{z - y}\right)\\

\end{array}
(FPCore (x y z t) :precision binary64 (* (/ (- x y) (- z y)) t))
↓
(FPCore (x y z t)
 :precision binary64
 (if (or (<= y -1.030146493336082e-190) (not (<= y 1.89196712684249e-129)))
   (* (/ (- x y) (- z y)) t)
   (* (* (cbrt (- x y)) (cbrt (- x y))) (* t (/ (cbrt (- x y)) (- z y))))))
double code(double x, double y, double z, double t) {
	return ((x - y) / (z - y)) * t;
}
↓
double code(double x, double y, double z, double t) {
	double tmp;
	if ((y <= -1.030146493336082e-190) || !(y <= 1.89196712684249e-129)) {
		tmp = ((x - y) / (z - y)) * t;
	} else {
		tmp = (cbrt(x - y) * cbrt(x - y)) * (t * (cbrt(x - y) / (z - y)));
	}
	return tmp;
}

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

Original2.2
Target2.2
Herbie1.8
\[\frac{t}{\frac{z - y}{x - y}}\]

Derivation

  1. Split input into 2 regimes

  2. if y < -1.030146493336082e-190 or 1.89196712684249e-129 < y

    1. Initial program 1.0

      \[\frac{x - y}{z - y} \cdot t\]

    if -1.030146493336082e-190 < y < 1.89196712684249e-129

    1. Initial program 6.3

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

    3. Applied *-un-lft-identity_binary646.3

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

    4. Applied add-cube-cbrt_binary647.1

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

    5. Applied times-frac_binary647.1

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

    6. Applied associate-*l*_binary644.7

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

    7. Simplified4.7

      \[\leadsto \frac{\sqrt[3]{x - y} \cdot \sqrt[3]{x - y}}{1} \cdot \color{blue}{\left(t \cdot \frac{\sqrt[3]{x - y}}{z - y}\right)}\]
  3. Recombined 2 regimes into one program.

  4. Final simplification1.8

    \[\leadsto \begin{array}{l} \mathbf{if}\;y \leq -1.030146493336082 \cdot 10^{-190} \lor \neg \left(y \leq 1.89196712684249 \cdot 10^{-129}\right):\\ \;\;\;\;\frac{x - y}{z - y} \cdot t\\ \mathbf{else}:\\ \;\;\;\;\left(\sqrt[3]{x - y} \cdot \sqrt[3]{x - y}\right) \cdot \left(t \cdot \frac{\sqrt[3]{x - y}}{z - y}\right)\\ \end{array}\]

Reproduce

herbie shell --seed 2020224 
(FPCore (x y z t)
  :name "Numeric.Signal.Multichannel:$cput from hsignal-0.2.7.1"
  :precision binary64

  :herbie-target
  (/ t (/ (- z y) (- x y)))

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