Average Error: 0.4 → 0.3
Time: 40.9s
Precision: 64
\[1 \le a \le 2 \le b \le 4 \le c \le 8 \le d \le 16 \le e \le 32\]
\[\left(\left(\left(e + d\right) + c\right) + b\right) + a\]
↓
\[\left(a + \left(e + b\right)\right) + \left(d + c\right)\]
\left(\left(\left(e + d\right) + c\right) + b\right) + a
↓
\left(a + \left(e + b\right)\right) + \left(d + c\right)
double f(double a, double b, double c, double d, double e) {
        double r155262 = e;
        double r155263 = d;
        double r155264 = r155262 + r155263;
        double r155265 = c;
        double r155266 = r155264 + r155265;
        double r155267 = b;
        double r155268 = r155266 + r155267;
        double r155269 = a;
        double r155270 = r155268 + r155269;
        return r155270;
}
↓
double f(double a, double b, double c, double d, double e) {
        double r155271 = a;
        double r155272 = e;
        double r155273 = b;
        double r155274 = r155272 + r155273;
        double r155275 = r155271 + r155274;
        double r155276 = d;
        double r155277 = c;
        double r155278 = r155276 + r155277;
        double r155279 = r155275 + r155278;
        return r155279;
}

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. Simplified0.3

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

  4. Applied *-un-lft-identity0.3

    \[\leadsto \left(c + \left(d + e\right)\right) + \color{blue}{1 \cdot \left(b + a\right)}\]

  5. Applied *-un-lft-identity0.3

    \[\leadsto \color{blue}{1 \cdot \left(c + \left(d + e\right)\right)} + 1 \cdot \left(b + a\right)\]

  6. Applied distribute-lft-out0.3

    \[\leadsto \color{blue}{1 \cdot \left(\left(c + \left(d + e\right)\right) + \left(b + a\right)\right)}\]

  7. Simplified0.3

    \[\leadsto 1 \cdot \color{blue}{\left(\left(a + \left(b + e\right)\right) + \left(c + d\right)\right)}\]

  8. Final simplification0.3

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

Reproduce

herbie shell --seed 2019195 
(FPCore (a b c d e)
  :name "Expression 1, p15"
  :pre (<= 1.0 a 2.0 b 4.0 c 8.0 d 16.0 e 32.0)

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

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