Data.Colour.RGB:hslsv from colour-2.3.3, B

Average Error: 0.4 → 0.2

Time: 4.4s

Precision: 64

Math

\[\frac{60 \cdot \left(x - y\right)}{z - t} + a \cdot 120\]

↓

\[60 \cdot \frac{x - y}{z - t} + a \cdot 120\]

C

double code(double x, double y, double z, double t, double a) {
	return ((double) (((double) (((double) (60.0 * ((double) (x - y)))) / ((double) (z - t)))) + ((double) (a * 120.0))));
}

↓

double code(double x, double y, double z, double t, double a) {
	return ((double) (((double) (60.0 * ((double) (((double) (x - y)) / ((double) (z - t)))))) + ((double) (a * 120.0))));
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Bits error versus t

Bits error versus a

Target

Original	0.4
Target	0.2
Herbie	0.2

\[\frac{60}{\frac{z - t}{x - y}} + a \cdot 120\]

Derivation

1. Initial program 0.4

   \[\frac{60 \cdot \left(x - y\right)}{z - t} + a \cdot 120\]
2. Using strategy rm

3. Applied *-un-lft-identity 0.4

   \[\leadsto \frac{60 \cdot \left(x - y\right)}{\color{blue}{1 \cdot \left(z - t\right)}} + a \cdot 120\]

4. Applied times-frac 0.2

   \[\leadsto \color{blue}{\frac{60}{1} \cdot \frac{x - y}{z - t}} + a \cdot 120\]

5. Simplified 0.2

   \[\leadsto \color{blue}{60} \cdot \frac{x - y}{z - t} + a \cdot 120\]

6. Final simplification 0.2

   \[\leadsto 60 \cdot \frac{x - y}{z - t} + a \cdot 120\]

Reproduce

herbie shell --seed 2020128 
(FPCore (x y z t a)
  :name "Data.Colour.RGB:hslsv from colour-2.3.3, B"
  :precision binary64

  :herbie-target
  (+ (/ 60.0 (/ (- z t) (- x y))) (* a 120.0))

  (+ (/ (* 60.0 (- x y)) (- z t)) (* a 120.0)))