Average Error: 3.7 → 0
Time: 6.4s
Precision: 64
\[-14 \le a \le -13 \land -3 \le b \le -2 \land 3 \le c \le 3.5 \land 12.5 \le d \le 13.5\]
\[\left(a + \left(b + \left(c + d\right)\right)\right) \cdot 2\]
↓
\[2 \cdot \left(\left(d + a\right) + \left(c + b\right)\right)\]
\left(a + \left(b + \left(c + d\right)\right)\right) \cdot 2
↓
2 \cdot \left(\left(d + a\right) + \left(c + b\right)\right)
double f(double a, double b, double c, double d) {
        double r1896643 = a;
        double r1896644 = b;
        double r1896645 = c;
        double r1896646 = d;
        double r1896647 = r1896645 + r1896646;
        double r1896648 = r1896644 + r1896647;
        double r1896649 = r1896643 + r1896648;
        double r1896650 = 2.0;
        double r1896651 = r1896649 * r1896650;
        return r1896651;
}
↓
double f(double a, double b, double c, double d) {
        double r1896652 = 2.0;
        double r1896653 = d;
        double r1896654 = a;
        double r1896655 = r1896653 + r1896654;
        double r1896656 = c;
        double r1896657 = b;
        double r1896658 = r1896656 + r1896657;
        double r1896659 = r1896655 + r1896658;
        double r1896660 = r1896652 * r1896659;
        return r1896660;
}

Error

Bits error versus a

Bits error versus b

Bits error versus c

Bits error versus d

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original3.7
Target3.8
Herbie0
\[\left(a + b\right) \cdot 2 + \left(c + d\right) \cdot 2\]

Derivation

  1. Initial program 3.7

    \[\left(a + \left(b + \left(c + d\right)\right)\right) \cdot 2\]
  2. Using strategy rm

  3. Applied associate-+r+2.8

    \[\leadsto \left(a + \color{blue}{\left(\left(b + c\right) + d\right)}\right) \cdot 2\]
  4. Using strategy rm

  5. Applied +-commutative2.8

    \[\leadsto \color{blue}{\left(\left(\left(b + c\right) + d\right) + a\right)} \cdot 2\]
  6. Using strategy rm

  7. Applied associate-+l+0

    \[\leadsto \color{blue}{\left(\left(b + c\right) + \left(d + a\right)\right)} \cdot 2\]

  8. Final simplification0

    \[\leadsto 2 \cdot \left(\left(d + a\right) + \left(c + b\right)\right)\]

Reproduce

herbie shell --seed 2019132 +o rules:numerics
(FPCore (a b c d)
  :name "Expression, p6"
  :pre (and (<= -14 a -13) (<= -3 b -2) (<= 3 c 3.5) (<= 12.5 d 13.5))

  :herbie-target
  (+ (* (+ a b) 2) (* (+ c d) 2))

  (* (+ a (+ b (+ c d))) 2))