Diagrams.Backend.Cairo.Internal:setTexture from diagrams-cairo-1.3.0.3

Average Error: 12.4 → 0.5

Time: 2.4s

Precision: binary64

Math

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

↓

\[\begin{array}{l} \mathbf{if}\;\frac{x \cdot \left(y - z\right)}{y} \le -2.85881602499750145 \cdot 10^{307} \lor \neg \left(\frac{x \cdot \left(y - z\right)}{y} \le -1.35754709924995739 \cdot 10^{114} \lor \neg \left(\frac{x \cdot \left(y - z\right)}{y} \le 1.2951699973466196 \cdot 10^{54} \lor \neg \left(\frac{x \cdot \left(y - z\right)}{y} \le 1.9950788779712852 \cdot 10^{303}\right)\right)\right):\\ \;\;\;\;\frac{x}{\frac{y}{y - z}}\\ \mathbf{else}:\\ \;\;\;\;\frac{x \cdot \left(y - z\right)}{y}\\ \end{array}\]

C

double code(double x, double y, double z) {
	return ((double) (((double) (x * ((double) (y - z)))) / y));
}

↓

double code(double x, double y, double z) {
	double VAR;
	if (((((double) (((double) (x * ((double) (y - z)))) / y)) <= -2.8588160249975014e+307) || !((((double) (((double) (x * ((double) (y - z)))) / y)) <= -1.3575470992499574e+114) || !((((double) (((double) (x * ((double) (y - z)))) / y)) <= 1.2951699973466196e+54) || !(((double) (((double) (x * ((double) (y - z)))) / y)) <= 1.9950788779712852e+303))))) {
		VAR = ((double) (x / ((double) (y / ((double) (y - z))))));
	} else {
		VAR = ((double) (((double) (x * ((double) (y - z)))) / y));
	}
	return VAR;
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Target

Original	12.4
Target	3.2
Herbie	0.5

\[\begin{array}{l} \mathbf{if}\;z \lt -2.060202331921739 \cdot 10^{104}:\\ \;\;\;\;x - \frac{z \cdot x}{y}\\ \mathbf{elif}\;z \lt 1.69397660138285259 \cdot 10^{213}:\\ \;\;\;\;\frac{x}{\frac{y}{y - z}}\\ \mathbf{else}:\\ \;\;\;\;\left(y - z\right) \cdot \frac{x}{y}\\ \end{array}\]

Derivation

1. Split input into 2 regimes

2. if (/ (* x (- y z)) y) < -2.85881602499750145e307 or -1.35754709924995739e114 < (/ (* x (- y z)) y) < 1.2951699973466196e54 or 1.9950788779712852e303 < (/ (* x (- y z)) y)

   1. Initial program 17.4

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

   3. Applied associate-/l* 0.6

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

   if -2.85881602499750145e307 < (/ (* x (- y z)) y) < -1.35754709924995739e114 or 1.2951699973466196e54 < (/ (* x (- y z)) y) < 1.9950788779712852e303

   1. Initial program 0.2

      \[\frac{x \cdot \left(y - z\right)}{y}\]
3. Recombined 2 regimes into one program.

4. Final simplification 0.5

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{x \cdot \left(y - z\right)}{y} \le -2.85881602499750145 \cdot 10^{307} \lor \neg \left(\frac{x \cdot \left(y - z\right)}{y} \le -1.35754709924995739 \cdot 10^{114} \lor \neg \left(\frac{x \cdot \left(y - z\right)}{y} \le 1.2951699973466196 \cdot 10^{54} \lor \neg \left(\frac{x \cdot \left(y - z\right)}{y} \le 1.9950788779712852 \cdot 10^{303}\right)\right)\right):\\ \;\;\;\;\frac{x}{\frac{y}{y - z}}\\ \mathbf{else}:\\ \;\;\;\;\frac{x \cdot \left(y - z\right)}{y}\\ \end{array}\]

Reproduce

herbie shell --seed 2020155 
(FPCore (x y z)
  :name "Diagrams.Backend.Cairo.Internal:setTexture from diagrams-cairo-1.3.0.3"
  :precision binary64

  :herbie-target
  (if (< z -2.060202331921739e+104) (- x (/ (* z x) y)) (if (< z 1.6939766013828526e+213) (/ x (/ y (- y z))) (* (- y z) (/ x y))))

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