Rosa's Benchmark

Percentage Accurate: 99.8% → 99.8%
Time: 6.8s
Alternatives: 7
Speedup: 3.7×

Specification

?
\[0.954929658551372 \cdot x - 0.12900613773279798 \cdot \left(\left(x \cdot x\right) \cdot x\right) \]

Local Percentage Accuracy vs ?

The average percentage accuracy by input value. Horizontal axis shows value of an input variable; the variable is choosen in the title. Vertical axis is accuracy; higher is better. Red represent the original program, while blue represents Herbie's suggestion. These can be toggled with buttons below the plot. The line is an average while dots represent individual samples.

Accuracy vs Speed?

Herbie found 7 alternatives:

AlternativeAccuracySpeedup
The accuracy (vertical axis) and speed (horizontal axis) of each alternatives. Up and to the right is better. The red square shows the initial program, and each blue circle shows an alternative.The line shows the best available speed-accuracy tradeoffs.

Alternative 1: 99.8% accurate, 0.1× speedup?

\[x \cdot \mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right) \]
Derivation
  1. Initial program 99.8%

    \[0.954929658551372 \cdot x - 0.12900613773279798 \cdot \left(\left(x \cdot x\right) \cdot x\right) \]
  2. Step-by-step derivation
    1. associate-*r*99.8%

      \[\leadsto 0.954929658551372 \cdot x - \color{blue}{\left(0.12900613773279798 \cdot \left(x \cdot x\right)\right) \cdot x} \]
    2. distribute-rgt-out--99.8%

      \[\leadsto \color{blue}{x \cdot \left(0.954929658551372 - 0.12900613773279798 \cdot \left(x \cdot x\right)\right)} \]
    3. sub-neg99.8%

      \[\leadsto x \cdot \color{blue}{\left(0.954929658551372 + \left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right)\right)} \]
    4. +-commutative99.8%

      \[\leadsto x \cdot \color{blue}{\left(\left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right) + 0.954929658551372\right)} \]
    5. *-commutative99.8%

      \[\leadsto x \cdot \left(\left(-\color{blue}{\left(x \cdot x\right) \cdot 0.12900613773279798}\right) + 0.954929658551372\right) \]
    6. distribute-rgt-neg-in99.8%

      \[\leadsto x \cdot \left(\color{blue}{\left(x \cdot x\right) \cdot \left(-0.12900613773279798\right)} + 0.954929658551372\right) \]
    7. fma-def99.8%

      \[\leadsto x \cdot \color{blue}{\mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
    8. metadata-eval99.8%

      \[\leadsto x \cdot \mathsf{fma}\left(x \cdot x, \color{blue}{-0.12900613773279798}, 0.954929658551372\right) \]
  3. Simplified99.8%

    \[\leadsto \color{blue}{x \cdot \mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
  4. Final simplification99.8%

    \[\leadsto x \cdot \mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right) \]

Alternative 2: 99.0% accurate, 1.0× speedup?

\[\begin{array}{l} \mathbf{if}\;x \leq -2.8 \lor \neg \left(x \leq 2.7\right):\\ \;\;\;\;x \cdot \left(\left(x \cdot x\right) \cdot -0.12900613773279798\right)\\ \mathbf{else}:\\ \;\;\;\;x \cdot 0.954929658551372\\ \end{array} \]
Derivation
  1. Split input into 2 regimes
  2. if x < -2.7999999999999998 or 2.7000000000000002 < x

    1. Initial program 99.8%

      \[0.954929658551372 \cdot x - 0.12900613773279798 \cdot \left(\left(x \cdot x\right) \cdot x\right) \]
    2. Step-by-step derivation
      1. associate-*r*99.8%

        \[\leadsto 0.954929658551372 \cdot x - \color{blue}{\left(0.12900613773279798 \cdot \left(x \cdot x\right)\right) \cdot x} \]
      2. distribute-rgt-out--99.8%

        \[\leadsto \color{blue}{x \cdot \left(0.954929658551372 - 0.12900613773279798 \cdot \left(x \cdot x\right)\right)} \]
      3. sub-neg99.8%

        \[\leadsto x \cdot \color{blue}{\left(0.954929658551372 + \left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right)\right)} \]
      4. +-commutative99.8%

        \[\leadsto x \cdot \color{blue}{\left(\left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right) + 0.954929658551372\right)} \]
      5. *-commutative99.8%

        \[\leadsto x \cdot \left(\left(-\color{blue}{\left(x \cdot x\right) \cdot 0.12900613773279798}\right) + 0.954929658551372\right) \]
      6. distribute-rgt-neg-in99.8%

        \[\leadsto x \cdot \left(\color{blue}{\left(x \cdot x\right) \cdot \left(-0.12900613773279798\right)} + 0.954929658551372\right) \]
      7. fma-def99.9%

        \[\leadsto x \cdot \color{blue}{\mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
      8. metadata-eval99.9%

        \[\leadsto x \cdot \mathsf{fma}\left(x \cdot x, \color{blue}{-0.12900613773279798}, 0.954929658551372\right) \]
    3. Simplified99.9%

      \[\leadsto \color{blue}{x \cdot \mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
    4. Taylor expanded in x around inf 99.3%

      \[\leadsto x \cdot \color{blue}{\left(-0.12900613773279798 \cdot {x}^{2}\right)} \]
    5. Step-by-step derivation
      1. unpow299.3%

        \[\leadsto x \cdot \left(-0.12900613773279798 \cdot \color{blue}{\left(x \cdot x\right)}\right) \]
    6. Simplified99.3%

      \[\leadsto x \cdot \color{blue}{\left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right)} \]

    if -2.7999999999999998 < x < 2.7000000000000002

    1. Initial program 99.7%

      \[0.954929658551372 \cdot x - 0.12900613773279798 \cdot \left(\left(x \cdot x\right) \cdot x\right) \]
    2. Step-by-step derivation
      1. associate-*r*99.7%

        \[\leadsto 0.954929658551372 \cdot x - \color{blue}{\left(0.12900613773279798 \cdot \left(x \cdot x\right)\right) \cdot x} \]
      2. distribute-rgt-out--99.7%

        \[\leadsto \color{blue}{x \cdot \left(0.954929658551372 - 0.12900613773279798 \cdot \left(x \cdot x\right)\right)} \]
      3. sub-neg99.7%

        \[\leadsto x \cdot \color{blue}{\left(0.954929658551372 + \left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right)\right)} \]
      4. +-commutative99.7%

        \[\leadsto x \cdot \color{blue}{\left(\left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right) + 0.954929658551372\right)} \]
      5. *-commutative99.7%

        \[\leadsto x \cdot \left(\left(-\color{blue}{\left(x \cdot x\right) \cdot 0.12900613773279798}\right) + 0.954929658551372\right) \]
      6. distribute-rgt-neg-in99.7%

        \[\leadsto x \cdot \left(\color{blue}{\left(x \cdot x\right) \cdot \left(-0.12900613773279798\right)} + 0.954929658551372\right) \]
      7. fma-def99.7%

        \[\leadsto x \cdot \color{blue}{\mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
      8. metadata-eval99.7%

        \[\leadsto x \cdot \mathsf{fma}\left(x \cdot x, \color{blue}{-0.12900613773279798}, 0.954929658551372\right) \]
    3. Simplified99.7%

      \[\leadsto \color{blue}{x \cdot \mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
    4. Taylor expanded in x around 0 98.2%

      \[\leadsto x \cdot \color{blue}{0.954929658551372} \]
  3. Recombined 2 regimes into one program.
  4. Final simplification98.8%

    \[\leadsto \begin{array}{l} \mathbf{if}\;x \leq -2.8 \lor \neg \left(x \leq 2.7\right):\\ \;\;\;\;x \cdot \left(\left(x \cdot x\right) \cdot -0.12900613773279798\right)\\ \mathbf{else}:\\ \;\;\;\;x \cdot 0.954929658551372\\ \end{array} \]

Alternative 3: 99.0% accurate, 1.0× speedup?

\[\begin{array}{l} \mathbf{if}\;x \leq -2.8:\\ \;\;\;\;x \cdot \left(\left(x \cdot x\right) \cdot -0.12900613773279798\right)\\ \mathbf{elif}\;x \leq 2.7:\\ \;\;\;\;x \cdot 0.954929658551372\\ \mathbf{else}:\\ \;\;\;\;x \cdot \left(x \cdot \left(x \cdot -0.12900613773279798\right)\right)\\ \end{array} \]
Derivation
  1. Split input into 3 regimes
  2. if x < -2.7999999999999998

    1. Initial program 99.8%

      \[0.954929658551372 \cdot x - 0.12900613773279798 \cdot \left(\left(x \cdot x\right) \cdot x\right) \]
    2. Step-by-step derivation
      1. associate-*r*99.8%

        \[\leadsto 0.954929658551372 \cdot x - \color{blue}{\left(0.12900613773279798 \cdot \left(x \cdot x\right)\right) \cdot x} \]
      2. distribute-rgt-out--99.8%

        \[\leadsto \color{blue}{x \cdot \left(0.954929658551372 - 0.12900613773279798 \cdot \left(x \cdot x\right)\right)} \]
      3. sub-neg99.8%

        \[\leadsto x \cdot \color{blue}{\left(0.954929658551372 + \left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right)\right)} \]
      4. +-commutative99.8%

        \[\leadsto x \cdot \color{blue}{\left(\left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right) + 0.954929658551372\right)} \]
      5. *-commutative99.8%

        \[\leadsto x \cdot \left(\left(-\color{blue}{\left(x \cdot x\right) \cdot 0.12900613773279798}\right) + 0.954929658551372\right) \]
      6. distribute-rgt-neg-in99.8%

        \[\leadsto x \cdot \left(\color{blue}{\left(x \cdot x\right) \cdot \left(-0.12900613773279798\right)} + 0.954929658551372\right) \]
      7. fma-def99.8%

        \[\leadsto x \cdot \color{blue}{\mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
      8. metadata-eval99.8%

        \[\leadsto x \cdot \mathsf{fma}\left(x \cdot x, \color{blue}{-0.12900613773279798}, 0.954929658551372\right) \]
    3. Simplified99.8%

      \[\leadsto \color{blue}{x \cdot \mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
    4. Taylor expanded in x around inf 99.8%

      \[\leadsto x \cdot \color{blue}{\left(-0.12900613773279798 \cdot {x}^{2}\right)} \]
    5. Step-by-step derivation
      1. unpow299.8%

        \[\leadsto x \cdot \left(-0.12900613773279798 \cdot \color{blue}{\left(x \cdot x\right)}\right) \]
    6. Simplified99.8%

      \[\leadsto x \cdot \color{blue}{\left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right)} \]

    if -2.7999999999999998 < x < 2.7000000000000002

    1. Initial program 99.7%

      \[0.954929658551372 \cdot x - 0.12900613773279798 \cdot \left(\left(x \cdot x\right) \cdot x\right) \]
    2. Step-by-step derivation
      1. associate-*r*99.7%

        \[\leadsto 0.954929658551372 \cdot x - \color{blue}{\left(0.12900613773279798 \cdot \left(x \cdot x\right)\right) \cdot x} \]
      2. distribute-rgt-out--99.7%

        \[\leadsto \color{blue}{x \cdot \left(0.954929658551372 - 0.12900613773279798 \cdot \left(x \cdot x\right)\right)} \]
      3. sub-neg99.7%

        \[\leadsto x \cdot \color{blue}{\left(0.954929658551372 + \left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right)\right)} \]
      4. +-commutative99.7%

        \[\leadsto x \cdot \color{blue}{\left(\left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right) + 0.954929658551372\right)} \]
      5. *-commutative99.7%

        \[\leadsto x \cdot \left(\left(-\color{blue}{\left(x \cdot x\right) \cdot 0.12900613773279798}\right) + 0.954929658551372\right) \]
      6. distribute-rgt-neg-in99.7%

        \[\leadsto x \cdot \left(\color{blue}{\left(x \cdot x\right) \cdot \left(-0.12900613773279798\right)} + 0.954929658551372\right) \]
      7. fma-def99.7%

        \[\leadsto x \cdot \color{blue}{\mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
      8. metadata-eval99.7%

        \[\leadsto x \cdot \mathsf{fma}\left(x \cdot x, \color{blue}{-0.12900613773279798}, 0.954929658551372\right) \]
    3. Simplified99.7%

      \[\leadsto \color{blue}{x \cdot \mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
    4. Taylor expanded in x around 0 98.2%

      \[\leadsto x \cdot \color{blue}{0.954929658551372} \]

    if 2.7000000000000002 < x

    1. Initial program 99.8%

      \[0.954929658551372 \cdot x - 0.12900613773279798 \cdot \left(\left(x \cdot x\right) \cdot x\right) \]
    2. Step-by-step derivation
      1. associate-*r*99.9%

        \[\leadsto 0.954929658551372 \cdot x - \color{blue}{\left(0.12900613773279798 \cdot \left(x \cdot x\right)\right) \cdot x} \]
      2. distribute-rgt-out--99.9%

        \[\leadsto \color{blue}{x \cdot \left(0.954929658551372 - 0.12900613773279798 \cdot \left(x \cdot x\right)\right)} \]
      3. sub-neg99.9%

        \[\leadsto x \cdot \color{blue}{\left(0.954929658551372 + \left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right)\right)} \]
      4. +-commutative99.9%

        \[\leadsto x \cdot \color{blue}{\left(\left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right) + 0.954929658551372\right)} \]
      5. *-commutative99.9%

        \[\leadsto x \cdot \left(\left(-\color{blue}{\left(x \cdot x\right) \cdot 0.12900613773279798}\right) + 0.954929658551372\right) \]
      6. distribute-rgt-neg-in99.9%

        \[\leadsto x \cdot \left(\color{blue}{\left(x \cdot x\right) \cdot \left(-0.12900613773279798\right)} + 0.954929658551372\right) \]
      7. fma-def99.9%

        \[\leadsto x \cdot \color{blue}{\mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
      8. metadata-eval99.9%

        \[\leadsto x \cdot \mathsf{fma}\left(x \cdot x, \color{blue}{-0.12900613773279798}, 0.954929658551372\right) \]
    3. Simplified99.9%

      \[\leadsto \color{blue}{x \cdot \mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
    4. Taylor expanded in x around inf 98.8%

      \[\leadsto x \cdot \color{blue}{\left(-0.12900613773279798 \cdot {x}^{2}\right)} \]
    5. Step-by-step derivation
      1. unpow298.8%

        \[\leadsto x \cdot \left(-0.12900613773279798 \cdot \color{blue}{\left(x \cdot x\right)}\right) \]
      2. *-commutative98.8%

        \[\leadsto x \cdot \color{blue}{\left(\left(x \cdot x\right) \cdot -0.12900613773279798\right)} \]
      3. associate-*r*98.9%

        \[\leadsto x \cdot \color{blue}{\left(x \cdot \left(x \cdot -0.12900613773279798\right)\right)} \]
    6. Simplified98.9%

      \[\leadsto x \cdot \color{blue}{\left(x \cdot \left(x \cdot -0.12900613773279798\right)\right)} \]
  3. Recombined 3 regimes into one program.
  4. Final simplification98.8%

    \[\leadsto \begin{array}{l} \mathbf{if}\;x \leq -2.8:\\ \;\;\;\;x \cdot \left(\left(x \cdot x\right) \cdot -0.12900613773279798\right)\\ \mathbf{elif}\;x \leq 2.7:\\ \;\;\;\;x \cdot 0.954929658551372\\ \mathbf{else}:\\ \;\;\;\;x \cdot \left(x \cdot \left(x \cdot -0.12900613773279798\right)\right)\\ \end{array} \]

Alternative 4: 99.8% accurate, 1.2× speedup?

\[x \cdot \left(0.954929658551372 - \left(x \cdot x\right) \cdot 0.12900613773279798\right) \]
Derivation
  1. Initial program 99.8%

    \[0.954929658551372 \cdot x - 0.12900613773279798 \cdot \left(\left(x \cdot x\right) \cdot x\right) \]
  2. Step-by-step derivation
    1. associate-*r*99.8%

      \[\leadsto 0.954929658551372 \cdot x - \color{blue}{\left(0.12900613773279798 \cdot \left(x \cdot x\right)\right) \cdot x} \]
    2. distribute-rgt-out--99.8%

      \[\leadsto \color{blue}{x \cdot \left(0.954929658551372 - 0.12900613773279798 \cdot \left(x \cdot x\right)\right)} \]
    3. associate-*r*99.8%

      \[\leadsto x \cdot \left(0.954929658551372 - \color{blue}{\left(0.12900613773279798 \cdot x\right) \cdot x}\right) \]
  3. Applied egg-rr99.8%

    \[\leadsto \color{blue}{x \cdot \left(0.954929658551372 - \left(0.12900613773279798 \cdot x\right) \cdot x\right)} \]
  4. Taylor expanded in x around 0 99.8%

    \[\leadsto x \cdot \left(0.954929658551372 - \color{blue}{0.12900613773279798 \cdot {x}^{2}}\right) \]
  5. Step-by-step derivation
    1. unpow299.8%

      \[\leadsto x \cdot \left(0.954929658551372 - 0.12900613773279798 \cdot \color{blue}{\left(x \cdot x\right)}\right) \]
  6. Simplified99.8%

    \[\leadsto x \cdot \left(0.954929658551372 - \color{blue}{0.12900613773279798 \cdot \left(x \cdot x\right)}\right) \]
  7. Final simplification99.8%

    \[\leadsto x \cdot \left(0.954929658551372 - \left(x \cdot x\right) \cdot 0.12900613773279798\right) \]

Alternative 5: 99.8% accurate, 1.2× speedup?

\[x \cdot \left(0.954929658551372 - x \cdot \left(x \cdot 0.12900613773279798\right)\right) \]
Derivation
  1. Initial program 99.8%

    \[0.954929658551372 \cdot x - 0.12900613773279798 \cdot \left(\left(x \cdot x\right) \cdot x\right) \]
  2. Step-by-step derivation
    1. associate-*r*99.8%

      \[\leadsto 0.954929658551372 \cdot x - \color{blue}{\left(0.12900613773279798 \cdot \left(x \cdot x\right)\right) \cdot x} \]
    2. distribute-rgt-out--99.8%

      \[\leadsto \color{blue}{x \cdot \left(0.954929658551372 - 0.12900613773279798 \cdot \left(x \cdot x\right)\right)} \]
    3. associate-*r*99.8%

      \[\leadsto x \cdot \left(0.954929658551372 - \color{blue}{\left(0.12900613773279798 \cdot x\right) \cdot x}\right) \]
  3. Applied egg-rr99.8%

    \[\leadsto \color{blue}{x \cdot \left(0.954929658551372 - \left(0.12900613773279798 \cdot x\right) \cdot x\right)} \]
  4. Final simplification99.8%

    \[\leadsto x \cdot \left(0.954929658551372 - x \cdot \left(x \cdot 0.12900613773279798\right)\right) \]

Alternative 6: 5.0% accurate, 3.7× speedup?

\[x \cdot -0.954929658551372 \]
Derivation
  1. Initial program 99.8%

    \[0.954929658551372 \cdot x - 0.12900613773279798 \cdot \left(\left(x \cdot x\right) \cdot x\right) \]
  2. Step-by-step derivation
    1. associate-*r*99.8%

      \[\leadsto 0.954929658551372 \cdot x - \color{blue}{\left(0.12900613773279798 \cdot \left(x \cdot x\right)\right) \cdot x} \]
    2. distribute-rgt-out--99.8%

      \[\leadsto \color{blue}{x \cdot \left(0.954929658551372 - 0.12900613773279798 \cdot \left(x \cdot x\right)\right)} \]
    3. sub-neg99.8%

      \[\leadsto x \cdot \color{blue}{\left(0.954929658551372 + \left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right)\right)} \]
    4. +-commutative99.8%

      \[\leadsto x \cdot \color{blue}{\left(\left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right) + 0.954929658551372\right)} \]
    5. *-commutative99.8%

      \[\leadsto x \cdot \left(\left(-\color{blue}{\left(x \cdot x\right) \cdot 0.12900613773279798}\right) + 0.954929658551372\right) \]
    6. distribute-rgt-neg-in99.8%

      \[\leadsto x \cdot \left(\color{blue}{\left(x \cdot x\right) \cdot \left(-0.12900613773279798\right)} + 0.954929658551372\right) \]
    7. fma-def99.8%

      \[\leadsto x \cdot \color{blue}{\mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
    8. metadata-eval99.8%

      \[\leadsto x \cdot \mathsf{fma}\left(x \cdot x, \color{blue}{-0.12900613773279798}, 0.954929658551372\right) \]
  3. Simplified99.8%

    \[\leadsto \color{blue}{x \cdot \mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
  4. Taylor expanded in x around 0 51.3%

    \[\leadsto x \cdot \color{blue}{0.954929658551372} \]
  5. Step-by-step derivation
    1. add-sqr-sqrt23.0%

      \[\leadsto \color{blue}{\sqrt{x \cdot 0.954929658551372} \cdot \sqrt{x \cdot 0.954929658551372}} \]
    2. sqrt-unprod25.0%

      \[\leadsto \color{blue}{\sqrt{\left(x \cdot 0.954929658551372\right) \cdot \left(x \cdot 0.954929658551372\right)}} \]
    3. *-commutative25.0%

      \[\leadsto \sqrt{\color{blue}{\left(0.954929658551372 \cdot x\right)} \cdot \left(x \cdot 0.954929658551372\right)} \]
    4. *-commutative25.0%

      \[\leadsto \sqrt{\left(0.954929658551372 \cdot x\right) \cdot \color{blue}{\left(0.954929658551372 \cdot x\right)}} \]
    5. swap-sqr25.0%

      \[\leadsto \sqrt{\color{blue}{\left(0.954929658551372 \cdot 0.954929658551372\right) \cdot \left(x \cdot x\right)}} \]
    6. metadata-eval25.0%

      \[\leadsto \sqrt{\color{blue}{0.9118906527810399} \cdot \left(x \cdot x\right)} \]
  6. Applied egg-rr25.0%

    \[\leadsto \color{blue}{\sqrt{0.9118906527810399 \cdot \left(x \cdot x\right)}} \]
  7. Step-by-step derivation
    1. unpow225.0%

      \[\leadsto \sqrt{0.9118906527810399 \cdot \color{blue}{{x}^{2}}} \]
    2. *-commutative25.0%

      \[\leadsto \sqrt{\color{blue}{{x}^{2} \cdot 0.9118906527810399}} \]
    3. unpow225.0%

      \[\leadsto \sqrt{\color{blue}{\left(x \cdot x\right)} \cdot 0.9118906527810399} \]
  8. Simplified25.0%

    \[\leadsto \color{blue}{\sqrt{\left(x \cdot x\right) \cdot 0.9118906527810399}} \]
  9. Taylor expanded in x around -inf 4.9%

    \[\leadsto \color{blue}{-0.954929658551372 \cdot x} \]
  10. Step-by-step derivation
    1. *-commutative4.9%

      \[\leadsto \color{blue}{x \cdot -0.954929658551372} \]
  11. Simplified4.9%

    \[\leadsto \color{blue}{x \cdot -0.954929658551372} \]
  12. Final simplification4.9%

    \[\leadsto x \cdot -0.954929658551372 \]

Alternative 7: 49.2% accurate, 3.7× speedup?

\[x \cdot 0.954929658551372 \]
Derivation
  1. Initial program 99.8%

    \[0.954929658551372 \cdot x - 0.12900613773279798 \cdot \left(\left(x \cdot x\right) \cdot x\right) \]
  2. Step-by-step derivation
    1. associate-*r*99.8%

      \[\leadsto 0.954929658551372 \cdot x - \color{blue}{\left(0.12900613773279798 \cdot \left(x \cdot x\right)\right) \cdot x} \]
    2. distribute-rgt-out--99.8%

      \[\leadsto \color{blue}{x \cdot \left(0.954929658551372 - 0.12900613773279798 \cdot \left(x \cdot x\right)\right)} \]
    3. sub-neg99.8%

      \[\leadsto x \cdot \color{blue}{\left(0.954929658551372 + \left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right)\right)} \]
    4. +-commutative99.8%

      \[\leadsto x \cdot \color{blue}{\left(\left(-0.12900613773279798 \cdot \left(x \cdot x\right)\right) + 0.954929658551372\right)} \]
    5. *-commutative99.8%

      \[\leadsto x \cdot \left(\left(-\color{blue}{\left(x \cdot x\right) \cdot 0.12900613773279798}\right) + 0.954929658551372\right) \]
    6. distribute-rgt-neg-in99.8%

      \[\leadsto x \cdot \left(\color{blue}{\left(x \cdot x\right) \cdot \left(-0.12900613773279798\right)} + 0.954929658551372\right) \]
    7. fma-def99.8%

      \[\leadsto x \cdot \color{blue}{\mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
    8. metadata-eval99.8%

      \[\leadsto x \cdot \mathsf{fma}\left(x \cdot x, \color{blue}{-0.12900613773279798}, 0.954929658551372\right) \]
  3. Simplified99.8%

    \[\leadsto \color{blue}{x \cdot \mathsf{fma}\left(x \cdot x, -0.12900613773279798, 0.954929658551372\right)} \]
  4. Taylor expanded in x around 0 51.3%

    \[\leadsto x \cdot \color{blue}{0.954929658551372} \]
  5. Final simplification51.3%

    \[\leadsto x \cdot 0.954929658551372 \]

Reproduce

?
herbie shell --seed 2023167 
(FPCore (x)
  :name "Rosa's Benchmark"
  :precision binary64
  (- (* 0.954929658551372 x) (* 0.12900613773279798 (* (* x x) x))))