Average Error: 0.4 → 0.3
Time: 4.8s
Precision: 64
\[1 \le a \le 2 \le b \le 4 \le c \le 8 \le d \le 16 \le e \le 32\]
\[\left(\left(\left(e + d\right) + c\right) + b\right) + a\]
↓
\[\left(e + d\right) + \left(c + \left(b + a\right)\right)\]
\left(\left(\left(e + d\right) + c\right) + b\right) + a
↓
\left(e + d\right) + \left(c + \left(b + a\right)\right)
double f(double a, double b, double c, double d, double e) {
        double r116897 = e;
        double r116898 = d;
        double r116899 = r116897 + r116898;
        double r116900 = c;
        double r116901 = r116899 + r116900;
        double r116902 = b;
        double r116903 = r116901 + r116902;
        double r116904 = a;
        double r116905 = r116903 + r116904;
        return r116905;
}
↓
double f(double a, double b, double c, double d, double e) {
        double r116906 = e;
        double r116907 = d;
        double r116908 = r116906 + r116907;
        double r116909 = c;
        double r116910 = b;
        double r116911 = a;
        double r116912 = r116910 + r116911;
        double r116913 = r116909 + r116912;
        double r116914 = r116908 + r116913;
        return r116914;
}

Error

Bits error versus a

Bits error versus b

Bits error versus c

Bits error versus d

Bits error versus e

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original0.4
Target0.2
Herbie0.3
\[\left(d + \left(c + \left(a + b\right)\right)\right) + e\]

Derivation

  1. Initial program 0.4

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

  3. Applied associate-+l+0.3

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

  5. Applied associate-+l+0.3

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

  6. Final simplification0.3

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

Reproduce

herbie shell --seed 2020046 
(FPCore (a b c d e)
  :name "Expression 1, p15"
  :precision binary64
  :pre (<= 1 a 2 b 4 c 8 d 16 e 32)

  :herbie-target
  (+ (+ d (+ c (+ a b))) e)

  (+ (+ (+ (+ e d) c) b) a))