Average Error: 0.4 → 0.3
Time: 2.1s
Precision: 64
\[1 \le a \le 2 \le b \le 4 \le c \le 8 \le d \le 16 \le e \le 32\]
\[\left(\left(\left(e + d\right) + c\right) + b\right) + a\]
↓
\[\left(\left(e + d\right) + c\right) + \left(b + a\right)\]
\left(\left(\left(e + d\right) + c\right) + b\right) + a
↓
\left(\left(e + d\right) + c\right) + \left(b + a\right)
double f(double a, double b, double c, double d, double e) {
        double r121977 = e;
        double r121978 = d;
        double r121979 = r121977 + r121978;
        double r121980 = c;
        double r121981 = r121979 + r121980;
        double r121982 = b;
        double r121983 = r121981 + r121982;
        double r121984 = a;
        double r121985 = r121983 + r121984;
        return r121985;
}
↓
double f(double a, double b, double c, double d, double e) {
        double r121986 = e;
        double r121987 = d;
        double r121988 = r121986 + r121987;
        double r121989 = c;
        double r121990 = r121988 + r121989;
        double r121991 = b;
        double r121992 = a;
        double r121993 = r121991 + r121992;
        double r121994 = r121990 + r121993;
        return r121994;
}

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. Final simplification0.3

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

Reproduce

herbie shell --seed 2020062 
(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))