Average Error: 0.4 → 0.2
Time: 6.6s
Precision: 64
\[1 \le a \le 2 \le b \le 4 \le c \le 8 \le d \le 16 \le e \le 32\]
\[\left(\left(\left(e + d\right) + c\right) + b\right) + a\]
↓
\[e + \left(d + \left(\left(a + b\right) + c\right)\right)\]
\left(\left(\left(e + d\right) + c\right) + b\right) + a
↓
e + \left(d + \left(\left(a + b\right) + c\right)\right)
double f(double a, double b, double c, double d, double e) {
        double r93792 = e;
        double r93793 = d;
        double r93794 = r93792 + r93793;
        double r93795 = c;
        double r93796 = r93794 + r93795;
        double r93797 = b;
        double r93798 = r93796 + r93797;
        double r93799 = a;
        double r93800 = r93798 + r93799;
        return r93800;
}
↓
double f(double a, double b, double c, double d, double e) {
        double r93801 = e;
        double r93802 = d;
        double r93803 = a;
        double r93804 = b;
        double r93805 = r93803 + r93804;
        double r93806 = c;
        double r93807 = r93805 + r93806;
        double r93808 = r93802 + r93807;
        double r93809 = r93801 + r93808;
        return r93809;
}

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

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. Simplified0.3

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

  8. Applied associate-+l+0.2

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

  10. Applied associate-+r+0.2

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

  11. Final simplification0.2

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

Reproduce

herbie shell --seed 2019208 
(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))