Average Error: 0.4 → 0.0
Time: 11.4s
Precision: 64
\[1 \le a \le 2 \le b \le 4 \le c \le 8 \le d \le 16 \le e \le 32\]
\[\left(\left(\left(e + d\right) + c\right) + b\right) + a\]
↓
\[\log \left(\left(e^{c} \cdot e^{d}\right) \cdot \left(\left(e^{b} \cdot e^{a}\right) \cdot e^{e}\right)\right)\]
\left(\left(\left(e + d\right) + c\right) + b\right) + a
↓
\log \left(\left(e^{c} \cdot e^{d}\right) \cdot \left(\left(e^{b} \cdot e^{a}\right) \cdot e^{e}\right)\right)
double f(double a, double b, double c, double d, double e) {
        double r2154702 = e;
        double r2154703 = d;
        double r2154704 = r2154702 + r2154703;
        double r2154705 = c;
        double r2154706 = r2154704 + r2154705;
        double r2154707 = b;
        double r2154708 = r2154706 + r2154707;
        double r2154709 = a;
        double r2154710 = r2154708 + r2154709;
        return r2154710;
}
↓
double f(double a, double b, double c, double d, double e) {
        double r2154711 = c;
        double r2154712 = exp(r2154711);
        double r2154713 = d;
        double r2154714 = exp(r2154713);
        double r2154715 = r2154712 * r2154714;
        double r2154716 = b;
        double r2154717 = exp(r2154716);
        double r2154718 = a;
        double r2154719 = exp(r2154718);
        double r2154720 = r2154717 * r2154719;
        double r2154721 = e;
        double r2154722 = exp(r2154721);
        double r2154723 = r2154720 * r2154722;
        double r2154724 = r2154715 * r2154723;
        double r2154725 = log(r2154724);
        return r2154725;
}

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
Herbie0.0
\[\left(d + \left(c + \left(a + b\right)\right)\right) + e\]

Derivation

  1. Initial program 0.4

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

  3. Applied add-log-exp0.4

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

  4. Applied add-log-exp0.4

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

  5. Applied add-log-exp0.4

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

  6. Applied sum-log0.4

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

  7. Applied sum-log0.3

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

  8. Simplified0.2

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

  10. Applied add-log-exp0.2

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

  11. Applied add-log-exp0.2

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

  12. Applied sum-log0.2

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

  13. Applied add-log-exp0.2

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

  14. Applied sum-log0.2

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

  15. Applied add-log-exp0.2

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

  16. Applied add-log-exp0.2

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

  17. Applied sum-log0.2

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

  18. Applied sum-log0.0

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

  19. Applied rem-exp-log0.0

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

  20. Final simplification0.0

    \[\leadsto \log \left(\left(e^{c} \cdot e^{d}\right) \cdot \left(\left(e^{b} \cdot e^{a}\right) \cdot e^{e}\right)\right)\]

Reproduce

herbie shell --seed 2019128 +o rules:numerics
(FPCore (a b c d e)
  :name "Expression 1, p15"
  :pre (<= 1 a 2 b 4 c 8 d 16 e 32)

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

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