Average Error: 46.8 → 44.7
Time: 51.7s
Precision: 64
\[\left(x \cdot \cos \left(\frac{\left(\left(y \cdot 2 + 1\right) \cdot z\right) \cdot t}{16}\right)\right) \cdot \cos \left(\frac{\left(\left(a \cdot 2 + 1\right) \cdot b\right) \cdot t}{16}\right)\]
↓
\[x\]
\left(x \cdot \cos \left(\frac{\left(\left(y \cdot 2 + 1\right) \cdot z\right) \cdot t}{16}\right)\right) \cdot \cos \left(\frac{\left(\left(a \cdot 2 + 1\right) \cdot b\right) \cdot t}{16}\right)
↓
x
double f(double x, double y, double z, double t, double a, double b) {
        double r46570626 = x;
        double r46570627 = y;
        double r46570628 = 2.0;
        double r46570629 = r46570627 * r46570628;
        double r46570630 = 1.0;
        double r46570631 = r46570629 + r46570630;
        double r46570632 = z;
        double r46570633 = r46570631 * r46570632;
        double r46570634 = t;
        double r46570635 = r46570633 * r46570634;
        double r46570636 = 16.0;
        double r46570637 = r46570635 / r46570636;
        double r46570638 = cos(r46570637);
        double r46570639 = r46570626 * r46570638;
        double r46570640 = a;
        double r46570641 = r46570640 * r46570628;
        double r46570642 = r46570641 + r46570630;
        double r46570643 = b;
        double r46570644 = r46570642 * r46570643;
        double r46570645 = r46570644 * r46570634;
        double r46570646 = r46570645 / r46570636;
        double r46570647 = cos(r46570646);
        double r46570648 = r46570639 * r46570647;
        return r46570648;
}
↓
double f(double x, double __attribute__((unused)) y, double __attribute__((unused)) z, double __attribute__((unused)) t, double __attribute__((unused)) a, double __attribute__((unused)) b) {
        double r46570649 = x;
        return r46570649;
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Bits error versus t

Bits error versus a

Bits error versus b

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original46.8
Target45.0
Herbie44.7
\[x \cdot \cos \left(\frac{b}{16} \cdot \frac{t}{\left(1 - a \cdot 2\right) + {\left(a \cdot 2\right)}^{2}}\right)\]

Derivation

  1. Initial program 46.8

    \[\left(x \cdot \cos \left(\frac{\left(\left(y \cdot 2 + 1\right) \cdot z\right) \cdot t}{16}\right)\right) \cdot \cos \left(\frac{\left(\left(a \cdot 2 + 1\right) \cdot b\right) \cdot t}{16}\right)\]

  2. Taylor expanded around 0 46.1

    \[\leadsto \left(x \cdot \color{blue}{1}\right) \cdot \cos \left(\frac{\left(\left(a \cdot 2 + 1\right) \cdot b\right) \cdot t}{16}\right)\]

  3. Taylor expanded around 0 44.7

    \[\leadsto \color{blue}{x}\]

  4. Final simplification44.7

    \[\leadsto x\]

Reproduce

herbie shell --seed 2019171 
(FPCore (x y z t a b)
  :name "Codec.Picture.Jpg.FastDct:referenceDct from JuicyPixels-3.2.6.1"

  :herbie-target
  (* x (cos (* (/ b 16.0) (/ t (+ (- 1.0 (* a 2.0)) (pow (* a 2.0) 2.0))))))

  (* (* x (cos (/ (* (* (+ (* y 2.0) 1.0) z) t) 16.0))) (cos (/ (* (* (+ (* a 2.0) 1.0) b) t) 16.0))))