Average Error: 7.2 → 0.8
Time: 15.2s
Precision: 64
\[\frac{x}{\left(y - z\right) \cdot \left(t - z\right)}\]
↓
\[\begin{array}{l} \mathbf{if}\;\left(y - z\right) \cdot \left(t - z\right) \le -3.818540540467079267699977309316411928156 \cdot 10^{275}:\\ \;\;\;\;\frac{x \cdot \frac{1}{y - z}}{t - z}\\ \mathbf{elif}\;\left(y - z\right) \cdot \left(t - z\right) \le 3.342850604960242252109859433923772722235 \cdot 10^{212}:\\ \;\;\;\;\frac{x}{\left(y - z\right) \cdot \left(t - z\right)}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{x}{t - z}}{y - z}\\ \end{array}\]
\frac{x}{\left(y - z\right) \cdot \left(t - z\right)}
↓
\begin{array}{l}
\mathbf{if}\;\left(y - z\right) \cdot \left(t - z\right) \le -3.818540540467079267699977309316411928156 \cdot 10^{275}:\\
\;\;\;\;\frac{x \cdot \frac{1}{y - z}}{t - z}\\

\mathbf{elif}\;\left(y - z\right) \cdot \left(t - z\right) \le 3.342850604960242252109859433923772722235 \cdot 10^{212}:\\
\;\;\;\;\frac{x}{\left(y - z\right) \cdot \left(t - z\right)}\\

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

\end{array}
double f(double x, double y, double z, double t) {
        double r641215 = x;
        double r641216 = y;
        double r641217 = z;
        double r641218 = r641216 - r641217;
        double r641219 = t;
        double r641220 = r641219 - r641217;
        double r641221 = r641218 * r641220;
        double r641222 = r641215 / r641221;
        return r641222;
}
↓
double f(double x, double y, double z, double t) {
        double r641223 = y;
        double r641224 = z;
        double r641225 = r641223 - r641224;
        double r641226 = t;
        double r641227 = r641226 - r641224;
        double r641228 = r641225 * r641227;
        double r641229 = -3.818540540467079e+275;
        bool r641230 = r641228 <= r641229;
        double r641231 = x;
        double r641232 = 1.0;
        double r641233 = r641232 / r641225;
        double r641234 = r641231 * r641233;
        double r641235 = r641234 / r641227;
        double r641236 = 3.3428506049602423e+212;
        bool r641237 = r641228 <= r641236;
        double r641238 = r641231 / r641228;
        double r641239 = r641231 / r641227;
        double r641240 = r641239 / r641225;
        double r641241 = r641237 ? r641238 : r641240;
        double r641242 = r641230 ? r641235 : r641241;
        return r641242;
}

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

Original7.2
Target8.1
Herbie0.8
\[\begin{array}{l} \mathbf{if}\;\frac{x}{\left(y - z\right) \cdot \left(t - z\right)} \lt 0.0:\\ \;\;\;\;\frac{\frac{x}{y - z}}{t - z}\\ \mathbf{else}:\\ \;\;\;\;x \cdot \frac{1}{\left(y - z\right) \cdot \left(t - z\right)}\\ \end{array}\]

Derivation

  1. Split input into 3 regimes

  2. if (* (- y z) (- t z)) < -3.818540540467079e+275

    1. Initial program 16.6

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

    3. Applied associate-/r*0.1

      \[\leadsto \color{blue}{\frac{\frac{x}{y - z}}{t - z}}\]
    4. Using strategy rm

    5. Applied div-inv0.1

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

    if -3.818540540467079e+275 < (* (- y z) (- t z)) < 3.3428506049602423e+212

    1. Initial program 1.6

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

    if 3.3428506049602423e+212 < (* (- y z) (- t z))

    1. Initial program 11.6

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

    3. Applied associate-/r*0.2

      \[\leadsto \color{blue}{\frac{\frac{x}{y - z}}{t - z}}\]
    4. Using strategy rm

    5. Applied div-inv0.3

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

    7. Applied associate-*l/0.2

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

    8. Simplified0.1

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

  4. Final simplification0.8

    \[\leadsto \begin{array}{l} \mathbf{if}\;\left(y - z\right) \cdot \left(t - z\right) \le -3.818540540467079267699977309316411928156 \cdot 10^{275}:\\ \;\;\;\;\frac{x \cdot \frac{1}{y - z}}{t - z}\\ \mathbf{elif}\;\left(y - z\right) \cdot \left(t - z\right) \le 3.342850604960242252109859433923772722235 \cdot 10^{212}:\\ \;\;\;\;\frac{x}{\left(y - z\right) \cdot \left(t - z\right)}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{x}{t - z}}{y - z}\\ \end{array}\]

Reproduce

herbie shell --seed 2019325 
(FPCore (x y z t)
  :name "Data.Random.Distribution.Triangular:triangularCDF from random-fu-0.2.6.2, B"
  :precision binary64

  :herbie-target
  (if (< (/ x (* (- y z) (- t z))) 0.0) (/ (/ x (- y z)) (- t z)) (* x (/ 1 (* (- y z) (- t z)))))

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