Average Error: 0.0 → 0.1
Time: 2.1s
Precision: 64
\[x \cdot e^{y \cdot y}\]
↓
\[\left(x \cdot {\left(e^{y}\right)}^{\left(\frac{y}{2}\right)}\right) \cdot \sqrt{e^{y \cdot y}}\]
x \cdot e^{y \cdot y}
↓
\left(x \cdot {\left(e^{y}\right)}^{\left(\frac{y}{2}\right)}\right) \cdot \sqrt{e^{y \cdot y}}
double f(double x, double y) {
        double r796258 = x;
        double r796259 = y;
        double r796260 = r796259 * r796259;
        double r796261 = exp(r796260);
        double r796262 = r796258 * r796261;
        return r796262;
}
↓
double f(double x, double y) {
        double r796263 = x;
        double r796264 = y;
        double r796265 = exp(r796264);
        double r796266 = 2.0;
        double r796267 = r796264 / r796266;
        double r796268 = pow(r796265, r796267);
        double r796269 = r796263 * r796268;
        double r796270 = r796264 * r796264;
        double r796271 = exp(r796270);
        double r796272 = sqrt(r796271);
        double r796273 = r796269 * r796272;
        return r796273;
}

Error

Bits error versus x

Bits error versus y

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Results

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Target

Original0.0
Target0.0
Herbie0.1
\[x \cdot {\left(e^{y}\right)}^{y}\]

Derivation

  1. Initial program 0.0

    \[x \cdot e^{y \cdot y}\]
  2. Using strategy rm

  3. Applied add-sqr-sqrt0.1

    \[\leadsto x \cdot \color{blue}{\left(\sqrt{e^{y \cdot y}} \cdot \sqrt{e^{y \cdot y}}\right)}\]

  4. Applied associate-*r*0.1

    \[\leadsto \color{blue}{\left(x \cdot \sqrt{e^{y \cdot y}}\right) \cdot \sqrt{e^{y \cdot y}}}\]
  5. Using strategy rm

  6. Applied add-log-exp0.1

    \[\leadsto \left(x \cdot \sqrt{e^{\color{blue}{\log \left(e^{y}\right)} \cdot y}}\right) \cdot \sqrt{e^{y \cdot y}}\]

  7. Applied exp-to-pow0.1

    \[\leadsto \left(x \cdot \sqrt{\color{blue}{{\left(e^{y}\right)}^{y}}}\right) \cdot \sqrt{e^{y \cdot y}}\]

  8. Applied sqrt-pow10.1

    \[\leadsto \left(x \cdot \color{blue}{{\left(e^{y}\right)}^{\left(\frac{y}{2}\right)}}\right) \cdot \sqrt{e^{y \cdot y}}\]

  9. Final simplification0.1

    \[\leadsto \left(x \cdot {\left(e^{y}\right)}^{\left(\frac{y}{2}\right)}\right) \cdot \sqrt{e^{y \cdot y}}\]

Reproduce

herbie shell --seed 2020024 
(FPCore (x y)
  :name "Data.Number.Erf:$dmerfcx from erf-2.0.0.0"
  :precision binary64

  :herbie-target
  (* x (pow (exp y) y))

  (* x (exp (* y y))))