Diagrams.TwoD.Arc:arcBetween from diagrams-lib-1.3.0.3

Percentage Accurate: 50.3% → 79.3%
Time: 4.2s
Alternatives: 4
Speedup: 4.0×

Specification

?
\[\begin{array}{l} \\ \begin{array}{l} t_0 := \left(y \cdot 4\right) \cdot y\\ \frac{x \cdot x - t\_0}{x \cdot x + t\_0} \end{array} \end{array} \]
(FPCore (x y)
 :precision binary64
 (let* ((t_0 (* (* y 4.0) y))) (/ (- (* x x) t_0) (+ (* x x) t_0))))
double code(double x, double y) {
	double t_0 = (y * 4.0) * y;
	return ((x * x) - t_0) / ((x * x) + t_0);
}
real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: t_0
    t_0 = (y * 4.0d0) * y
    code = ((x * x) - t_0) / ((x * x) + t_0)
end function
public static double code(double x, double y) {
	double t_0 = (y * 4.0) * y;
	return ((x * x) - t_0) / ((x * x) + t_0);
}
def code(x, y):
	t_0 = (y * 4.0) * y
	return ((x * x) - t_0) / ((x * x) + t_0)
function code(x, y)
	t_0 = Float64(Float64(y * 4.0) * y)
	return Float64(Float64(Float64(x * x) - t_0) / Float64(Float64(x * x) + t_0))
end
function tmp = code(x, y)
	t_0 = (y * 4.0) * y;
	tmp = ((x * x) - t_0) / ((x * x) + t_0);
end
code[x_, y_] := Block[{t$95$0 = N[(N[(y * 4.0), $MachinePrecision] * y), $MachinePrecision]}, N[(N[(N[(x * x), $MachinePrecision] - t$95$0), $MachinePrecision] / N[(N[(x * x), $MachinePrecision] + t$95$0), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}

\\
\begin{array}{l}
t_0 := \left(y \cdot 4\right) \cdot y\\
\frac{x \cdot x - t\_0}{x \cdot x + t\_0}
\end{array}
\end{array}

Sampling outcomes in binary64 precision:

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 4 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.

Initial Program: 50.3% accurate, 1.0× speedup?

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \left(y \cdot 4\right) \cdot y\\ \frac{x \cdot x - t\_0}{x \cdot x + t\_0} \end{array} \end{array} \]
(FPCore (x y)
 :precision binary64
 (let* ((t_0 (* (* y 4.0) y))) (/ (- (* x x) t_0) (+ (* x x) t_0))))
double code(double x, double y) {
	double t_0 = (y * 4.0) * y;
	return ((x * x) - t_0) / ((x * x) + t_0);
}
real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: t_0
    t_0 = (y * 4.0d0) * y
    code = ((x * x) - t_0) / ((x * x) + t_0)
end function
public static double code(double x, double y) {
	double t_0 = (y * 4.0) * y;
	return ((x * x) - t_0) / ((x * x) + t_0);
}
def code(x, y):
	t_0 = (y * 4.0) * y
	return ((x * x) - t_0) / ((x * x) + t_0)
function code(x, y)
	t_0 = Float64(Float64(y * 4.0) * y)
	return Float64(Float64(Float64(x * x) - t_0) / Float64(Float64(x * x) + t_0))
end
function tmp = code(x, y)
	t_0 = (y * 4.0) * y;
	tmp = ((x * x) - t_0) / ((x * x) + t_0);
end
code[x_, y_] := Block[{t$95$0 = N[(N[(y * 4.0), $MachinePrecision] * y), $MachinePrecision]}, N[(N[(N[(x * x), $MachinePrecision] - t$95$0), $MachinePrecision] / N[(N[(x * x), $MachinePrecision] + t$95$0), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}

\\
\begin{array}{l}
t_0 := \left(y \cdot 4\right) \cdot y\\
\frac{x \cdot x - t\_0}{x \cdot x + t\_0}
\end{array}
\end{array}

Alternative 1: 79.3% accurate, 0.7× speedup?

\[\begin{array}{l} \\ \begin{array}{l} t_0 := y \cdot \left(y \cdot 4\right)\\ \mathbf{if}\;x \cdot x \leq 2.95 \cdot 10^{-46}:\\ \;\;\;\;-1\\ \mathbf{elif}\;x \cdot x \leq 4.9 \cdot 10^{+272}:\\ \;\;\;\;\frac{x \cdot x - t\_0}{x \cdot x + t\_0}\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(y, \frac{y}{x \cdot x} \cdot -8, 1\right)\\ \end{array} \end{array} \]
(FPCore (x y)
 :precision binary64
 (let* ((t_0 (* y (* y 4.0))))
   (if (<= (* x x) 2.95e-46)
     -1.0
     (if (<= (* x x) 4.9e+272)
       (/ (- (* x x) t_0) (+ (* x x) t_0))
       (fma y (* (/ y (* x x)) -8.0) 1.0)))))
double code(double x, double y) {
	double t_0 = y * (y * 4.0);
	double tmp;
	if ((x * x) <= 2.95e-46) {
		tmp = -1.0;
	} else if ((x * x) <= 4.9e+272) {
		tmp = ((x * x) - t_0) / ((x * x) + t_0);
	} else {
		tmp = fma(y, ((y / (x * x)) * -8.0), 1.0);
	}
	return tmp;
}
function code(x, y)
	t_0 = Float64(y * Float64(y * 4.0))
	tmp = 0.0
	if (Float64(x * x) <= 2.95e-46)
		tmp = -1.0;
	elseif (Float64(x * x) <= 4.9e+272)
		tmp = Float64(Float64(Float64(x * x) - t_0) / Float64(Float64(x * x) + t_0));
	else
		tmp = fma(y, Float64(Float64(y / Float64(x * x)) * -8.0), 1.0);
	end
	return tmp
end
code[x_, y_] := Block[{t$95$0 = N[(y * N[(y * 4.0), $MachinePrecision]), $MachinePrecision]}, If[LessEqual[N[(x * x), $MachinePrecision], 2.95e-46], -1.0, If[LessEqual[N[(x * x), $MachinePrecision], 4.9e+272], N[(N[(N[(x * x), $MachinePrecision] - t$95$0), $MachinePrecision] / N[(N[(x * x), $MachinePrecision] + t$95$0), $MachinePrecision]), $MachinePrecision], N[(y * N[(N[(y / N[(x * x), $MachinePrecision]), $MachinePrecision] * -8.0), $MachinePrecision] + 1.0), $MachinePrecision]]]]
\begin{array}{l}

\\
\begin{array}{l}
t_0 := y \cdot \left(y \cdot 4\right)\\
\mathbf{if}\;x \cdot x \leq 2.95 \cdot 10^{-46}:\\
\;\;\;\;-1\\

\mathbf{elif}\;x \cdot x \leq 4.9 \cdot 10^{+272}:\\
\;\;\;\;\frac{x \cdot x - t\_0}{x \cdot x + t\_0}\\

\mathbf{else}:\\
\;\;\;\;\mathsf{fma}\left(y, \frac{y}{x \cdot x} \cdot -8, 1\right)\\


\end{array}
\end{array}
Derivation
  1. Split input into 3 regimes
  2. if (*.f64 x x) < 2.95e-46

    1. Initial program 71.2%

      \[\frac{x \cdot x - \left(y \cdot 4\right) \cdot y}{x \cdot x + \left(y \cdot 4\right) \cdot y} \]
    2. Add Preprocessing
    3. Taylor expanded in x around 0

      \[\leadsto \color{blue}{-1} \]
    4. Step-by-step derivation
      1. Applied rewrites82.3%

        \[\leadsto \color{blue}{-1} \]

      if 2.95e-46 < (*.f64 x x) < 4.9000000000000002e272

      1. Initial program 74.9%

        \[\frac{x \cdot x - \left(y \cdot 4\right) \cdot y}{x \cdot x + \left(y \cdot 4\right) \cdot y} \]
      2. Add Preprocessing

      if 4.9000000000000002e272 < (*.f64 x x)

      1. Initial program 3.7%

        \[\frac{x \cdot x - \left(y \cdot 4\right) \cdot y}{x \cdot x + \left(y \cdot 4\right) \cdot y} \]
      2. Add Preprocessing
      3. Taylor expanded in x around inf

        \[\leadsto \color{blue}{\left(1 + -4 \cdot \frac{{y}^{2}}{{x}^{2}}\right) - 4 \cdot \frac{{y}^{2}}{{x}^{2}}} \]
      4. Step-by-step derivation
        1. associate--l+N/A

          \[\leadsto \color{blue}{1 + \left(-4 \cdot \frac{{y}^{2}}{{x}^{2}} - 4 \cdot \frac{{y}^{2}}{{x}^{2}}\right)} \]
        2. distribute-rgt-out--N/A

          \[\leadsto 1 + \color{blue}{\frac{{y}^{2}}{{x}^{2}} \cdot \left(-4 - 4\right)} \]
        3. metadata-evalN/A

          \[\leadsto 1 + \frac{{y}^{2}}{{x}^{2}} \cdot \color{blue}{-8} \]
        4. *-commutativeN/A

          \[\leadsto 1 + \color{blue}{-8 \cdot \frac{{y}^{2}}{{x}^{2}}} \]
        5. +-commutativeN/A

          \[\leadsto \color{blue}{-8 \cdot \frac{{y}^{2}}{{x}^{2}} + 1} \]
        6. *-commutativeN/A

          \[\leadsto \color{blue}{\frac{{y}^{2}}{{x}^{2}} \cdot -8} + 1 \]
        7. unpow2N/A

          \[\leadsto \frac{\color{blue}{y \cdot y}}{{x}^{2}} \cdot -8 + 1 \]
        8. associate-/l*N/A

          \[\leadsto \color{blue}{\left(y \cdot \frac{y}{{x}^{2}}\right)} \cdot -8 + 1 \]
        9. associate-*l*N/A

          \[\leadsto \color{blue}{y \cdot \left(\frac{y}{{x}^{2}} \cdot -8\right)} + 1 \]
        10. lower-fma.f64N/A

          \[\leadsto \color{blue}{\mathsf{fma}\left(y, \frac{y}{{x}^{2}} \cdot -8, 1\right)} \]
        11. lower-*.f64N/A

          \[\leadsto \mathsf{fma}\left(y, \color{blue}{\frac{y}{{x}^{2}} \cdot -8}, 1\right) \]
        12. lower-/.f64N/A

          \[\leadsto \mathsf{fma}\left(y, \color{blue}{\frac{y}{{x}^{2}}} \cdot -8, 1\right) \]
        13. unpow2N/A

          \[\leadsto \mathsf{fma}\left(y, \frac{y}{\color{blue}{x \cdot x}} \cdot -8, 1\right) \]
        14. lower-*.f6485.6

          \[\leadsto \mathsf{fma}\left(y, \frac{y}{\color{blue}{x \cdot x}} \cdot -8, 1\right) \]
      5. Applied rewrites85.6%

        \[\leadsto \color{blue}{\mathsf{fma}\left(y, \frac{y}{x \cdot x} \cdot -8, 1\right)} \]
    5. Recombined 3 regimes into one program.
    6. Final simplification81.5%

      \[\leadsto \begin{array}{l} \mathbf{if}\;x \cdot x \leq 2.95 \cdot 10^{-46}:\\ \;\;\;\;-1\\ \mathbf{elif}\;x \cdot x \leq 4.9 \cdot 10^{+272}:\\ \;\;\;\;\frac{x \cdot x - y \cdot \left(y \cdot 4\right)}{x \cdot x + y \cdot \left(y \cdot 4\right)}\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(y, \frac{y}{x \cdot x} \cdot -8, 1\right)\\ \end{array} \]
    7. Add Preprocessing

    Alternative 2: 75.7% accurate, 1.2× speedup?

    \[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \cdot x \leq 3.8 \cdot 10^{-36}:\\ \;\;\;\;-1\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(y, \frac{y}{x \cdot x} \cdot -8, 1\right)\\ \end{array} \end{array} \]
    (FPCore (x y)
     :precision binary64
     (if (<= (* x x) 3.8e-36) -1.0 (fma y (* (/ y (* x x)) -8.0) 1.0)))
    double code(double x, double y) {
    	double tmp;
    	if ((x * x) <= 3.8e-36) {
    		tmp = -1.0;
    	} else {
    		tmp = fma(y, ((y / (x * x)) * -8.0), 1.0);
    	}
    	return tmp;
    }
    
    function code(x, y)
    	tmp = 0.0
    	if (Float64(x * x) <= 3.8e-36)
    		tmp = -1.0;
    	else
    		tmp = fma(y, Float64(Float64(y / Float64(x * x)) * -8.0), 1.0);
    	end
    	return tmp
    end
    
    code[x_, y_] := If[LessEqual[N[(x * x), $MachinePrecision], 3.8e-36], -1.0, N[(y * N[(N[(y / N[(x * x), $MachinePrecision]), $MachinePrecision] * -8.0), $MachinePrecision] + 1.0), $MachinePrecision]]
    
    \begin{array}{l}
    
    \\
    \begin{array}{l}
    \mathbf{if}\;x \cdot x \leq 3.8 \cdot 10^{-36}:\\
    \;\;\;\;-1\\
    
    \mathbf{else}:\\
    \;\;\;\;\mathsf{fma}\left(y, \frac{y}{x \cdot x} \cdot -8, 1\right)\\
    
    
    \end{array}
    \end{array}
    
    Derivation
    1. Split input into 2 regimes
    2. if (*.f64 x x) < 3.79999999999999971e-36

      1. Initial program 71.7%

        \[\frac{x \cdot x - \left(y \cdot 4\right) \cdot y}{x \cdot x + \left(y \cdot 4\right) \cdot y} \]
      2. Add Preprocessing
      3. Taylor expanded in x around 0

        \[\leadsto \color{blue}{-1} \]
      4. Step-by-step derivation
        1. Applied rewrites82.4%

          \[\leadsto \color{blue}{-1} \]

        if 3.79999999999999971e-36 < (*.f64 x x)

        1. Initial program 34.2%

          \[\frac{x \cdot x - \left(y \cdot 4\right) \cdot y}{x \cdot x + \left(y \cdot 4\right) \cdot y} \]
        2. Add Preprocessing
        3. Taylor expanded in x around inf

          \[\leadsto \color{blue}{\left(1 + -4 \cdot \frac{{y}^{2}}{{x}^{2}}\right) - 4 \cdot \frac{{y}^{2}}{{x}^{2}}} \]
        4. Step-by-step derivation
          1. associate--l+N/A

            \[\leadsto \color{blue}{1 + \left(-4 \cdot \frac{{y}^{2}}{{x}^{2}} - 4 \cdot \frac{{y}^{2}}{{x}^{2}}\right)} \]
          2. distribute-rgt-out--N/A

            \[\leadsto 1 + \color{blue}{\frac{{y}^{2}}{{x}^{2}} \cdot \left(-4 - 4\right)} \]
          3. metadata-evalN/A

            \[\leadsto 1 + \frac{{y}^{2}}{{x}^{2}} \cdot \color{blue}{-8} \]
          4. *-commutativeN/A

            \[\leadsto 1 + \color{blue}{-8 \cdot \frac{{y}^{2}}{{x}^{2}}} \]
          5. +-commutativeN/A

            \[\leadsto \color{blue}{-8 \cdot \frac{{y}^{2}}{{x}^{2}} + 1} \]
          6. *-commutativeN/A

            \[\leadsto \color{blue}{\frac{{y}^{2}}{{x}^{2}} \cdot -8} + 1 \]
          7. unpow2N/A

            \[\leadsto \frac{\color{blue}{y \cdot y}}{{x}^{2}} \cdot -8 + 1 \]
          8. associate-/l*N/A

            \[\leadsto \color{blue}{\left(y \cdot \frac{y}{{x}^{2}}\right)} \cdot -8 + 1 \]
          9. associate-*l*N/A

            \[\leadsto \color{blue}{y \cdot \left(\frac{y}{{x}^{2}} \cdot -8\right)} + 1 \]
          10. lower-fma.f64N/A

            \[\leadsto \color{blue}{\mathsf{fma}\left(y, \frac{y}{{x}^{2}} \cdot -8, 1\right)} \]
          11. lower-*.f64N/A

            \[\leadsto \mathsf{fma}\left(y, \color{blue}{\frac{y}{{x}^{2}} \cdot -8}, 1\right) \]
          12. lower-/.f64N/A

            \[\leadsto \mathsf{fma}\left(y, \color{blue}{\frac{y}{{x}^{2}}} \cdot -8, 1\right) \]
          13. unpow2N/A

            \[\leadsto \mathsf{fma}\left(y, \frac{y}{\color{blue}{x \cdot x}} \cdot -8, 1\right) \]
          14. lower-*.f6475.7

            \[\leadsto \mathsf{fma}\left(y, \frac{y}{\color{blue}{x \cdot x}} \cdot -8, 1\right) \]
        5. Applied rewrites75.7%

          \[\leadsto \color{blue}{\mathsf{fma}\left(y, \frac{y}{x \cdot x} \cdot -8, 1\right)} \]
      5. Recombined 2 regimes into one program.
      6. Add Preprocessing

      Alternative 3: 75.3% accurate, 4.0× speedup?

      \[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \cdot x \leq 5 \cdot 10^{-36}:\\ \;\;\;\;-1\\ \mathbf{else}:\\ \;\;\;\;1\\ \end{array} \end{array} \]
      (FPCore (x y) :precision binary64 (if (<= (* x x) 5e-36) -1.0 1.0))
      double code(double x, double y) {
      	double tmp;
      	if ((x * x) <= 5e-36) {
      		tmp = -1.0;
      	} else {
      		tmp = 1.0;
      	}
      	return tmp;
      }
      
      real(8) function code(x, y)
          real(8), intent (in) :: x
          real(8), intent (in) :: y
          real(8) :: tmp
          if ((x * x) <= 5d-36) then
              tmp = -1.0d0
          else
              tmp = 1.0d0
          end if
          code = tmp
      end function
      
      public static double code(double x, double y) {
      	double tmp;
      	if ((x * x) <= 5e-36) {
      		tmp = -1.0;
      	} else {
      		tmp = 1.0;
      	}
      	return tmp;
      }
      
      def code(x, y):
      	tmp = 0
      	if (x * x) <= 5e-36:
      		tmp = -1.0
      	else:
      		tmp = 1.0
      	return tmp
      
      function code(x, y)
      	tmp = 0.0
      	if (Float64(x * x) <= 5e-36)
      		tmp = -1.0;
      	else
      		tmp = 1.0;
      	end
      	return tmp
      end
      
      function tmp_2 = code(x, y)
      	tmp = 0.0;
      	if ((x * x) <= 5e-36)
      		tmp = -1.0;
      	else
      		tmp = 1.0;
      	end
      	tmp_2 = tmp;
      end
      
      code[x_, y_] := If[LessEqual[N[(x * x), $MachinePrecision], 5e-36], -1.0, 1.0]
      
      \begin{array}{l}
      
      \\
      \begin{array}{l}
      \mathbf{if}\;x \cdot x \leq 5 \cdot 10^{-36}:\\
      \;\;\;\;-1\\
      
      \mathbf{else}:\\
      \;\;\;\;1\\
      
      
      \end{array}
      \end{array}
      
      Derivation
      1. Split input into 2 regimes
      2. if (*.f64 x x) < 5.00000000000000004e-36

        1. Initial program 71.7%

          \[\frac{x \cdot x - \left(y \cdot 4\right) \cdot y}{x \cdot x + \left(y \cdot 4\right) \cdot y} \]
        2. Add Preprocessing
        3. Taylor expanded in x around 0

          \[\leadsto \color{blue}{-1} \]
        4. Step-by-step derivation
          1. Applied rewrites82.4%

            \[\leadsto \color{blue}{-1} \]

          if 5.00000000000000004e-36 < (*.f64 x x)

          1. Initial program 34.2%

            \[\frac{x \cdot x - \left(y \cdot 4\right) \cdot y}{x \cdot x + \left(y \cdot 4\right) \cdot y} \]
          2. Add Preprocessing
          3. Taylor expanded in x around inf

            \[\leadsto \color{blue}{1} \]
          4. Step-by-step derivation
            1. Applied rewrites75.0%

              \[\leadsto \color{blue}{1} \]
          5. Recombined 2 regimes into one program.
          6. Add Preprocessing

          Alternative 4: 49.7% accurate, 48.0× speedup?

          \[\begin{array}{l} \\ -1 \end{array} \]
          (FPCore (x y) :precision binary64 -1.0)
          double code(double x, double y) {
          	return -1.0;
          }
          
          real(8) function code(x, y)
              real(8), intent (in) :: x
              real(8), intent (in) :: y
              code = -1.0d0
          end function
          
          public static double code(double x, double y) {
          	return -1.0;
          }
          
          def code(x, y):
          	return -1.0
          
          function code(x, y)
          	return -1.0
          end
          
          function tmp = code(x, y)
          	tmp = -1.0;
          end
          
          code[x_, y_] := -1.0
          
          \begin{array}{l}
          
          \\
          -1
          \end{array}
          
          Derivation
          1. Initial program 50.8%

            \[\frac{x \cdot x - \left(y \cdot 4\right) \cdot y}{x \cdot x + \left(y \cdot 4\right) \cdot y} \]
          2. Add Preprocessing
          3. Taylor expanded in x around 0

            \[\leadsto \color{blue}{-1} \]
          4. Step-by-step derivation
            1. Applied rewrites50.9%

              \[\leadsto \color{blue}{-1} \]
            2. Add Preprocessing

            Developer Target 1: 50.8% accurate, 0.2× speedup?

            \[\begin{array}{l} \\ \begin{array}{l} t_0 := \left(y \cdot y\right) \cdot 4\\ t_1 := x \cdot x + t\_0\\ t_2 := \frac{t\_0}{t\_1}\\ t_3 := \left(y \cdot 4\right) \cdot y\\ \mathbf{if}\;\frac{x \cdot x - t\_3}{x \cdot x + t\_3} < 0.9743233849626781:\\ \;\;\;\;\frac{x \cdot x}{t\_1} - t\_2\\ \mathbf{else}:\\ \;\;\;\;{\left(\frac{x}{\sqrt{t\_1}}\right)}^{2} - t\_2\\ \end{array} \end{array} \]
            (FPCore (x y)
             :precision binary64
             (let* ((t_0 (* (* y y) 4.0))
                    (t_1 (+ (* x x) t_0))
                    (t_2 (/ t_0 t_1))
                    (t_3 (* (* y 4.0) y)))
               (if (< (/ (- (* x x) t_3) (+ (* x x) t_3)) 0.9743233849626781)
                 (- (/ (* x x) t_1) t_2)
                 (- (pow (/ x (sqrt t_1)) 2.0) t_2))))
            double code(double x, double y) {
            	double t_0 = (y * y) * 4.0;
            	double t_1 = (x * x) + t_0;
            	double t_2 = t_0 / t_1;
            	double t_3 = (y * 4.0) * y;
            	double tmp;
            	if ((((x * x) - t_3) / ((x * x) + t_3)) < 0.9743233849626781) {
            		tmp = ((x * x) / t_1) - t_2;
            	} else {
            		tmp = pow((x / sqrt(t_1)), 2.0) - t_2;
            	}
            	return tmp;
            }
            
            real(8) function code(x, y)
                real(8), intent (in) :: x
                real(8), intent (in) :: y
                real(8) :: t_0
                real(8) :: t_1
                real(8) :: t_2
                real(8) :: t_3
                real(8) :: tmp
                t_0 = (y * y) * 4.0d0
                t_1 = (x * x) + t_0
                t_2 = t_0 / t_1
                t_3 = (y * 4.0d0) * y
                if ((((x * x) - t_3) / ((x * x) + t_3)) < 0.9743233849626781d0) then
                    tmp = ((x * x) / t_1) - t_2
                else
                    tmp = ((x / sqrt(t_1)) ** 2.0d0) - t_2
                end if
                code = tmp
            end function
            
            public static double code(double x, double y) {
            	double t_0 = (y * y) * 4.0;
            	double t_1 = (x * x) + t_0;
            	double t_2 = t_0 / t_1;
            	double t_3 = (y * 4.0) * y;
            	double tmp;
            	if ((((x * x) - t_3) / ((x * x) + t_3)) < 0.9743233849626781) {
            		tmp = ((x * x) / t_1) - t_2;
            	} else {
            		tmp = Math.pow((x / Math.sqrt(t_1)), 2.0) - t_2;
            	}
            	return tmp;
            }
            
            def code(x, y):
            	t_0 = (y * y) * 4.0
            	t_1 = (x * x) + t_0
            	t_2 = t_0 / t_1
            	t_3 = (y * 4.0) * y
            	tmp = 0
            	if (((x * x) - t_3) / ((x * x) + t_3)) < 0.9743233849626781:
            		tmp = ((x * x) / t_1) - t_2
            	else:
            		tmp = math.pow((x / math.sqrt(t_1)), 2.0) - t_2
            	return tmp
            
            function code(x, y)
            	t_0 = Float64(Float64(y * y) * 4.0)
            	t_1 = Float64(Float64(x * x) + t_0)
            	t_2 = Float64(t_0 / t_1)
            	t_3 = Float64(Float64(y * 4.0) * y)
            	tmp = 0.0
            	if (Float64(Float64(Float64(x * x) - t_3) / Float64(Float64(x * x) + t_3)) < 0.9743233849626781)
            		tmp = Float64(Float64(Float64(x * x) / t_1) - t_2);
            	else
            		tmp = Float64((Float64(x / sqrt(t_1)) ^ 2.0) - t_2);
            	end
            	return tmp
            end
            
            function tmp_2 = code(x, y)
            	t_0 = (y * y) * 4.0;
            	t_1 = (x * x) + t_0;
            	t_2 = t_0 / t_1;
            	t_3 = (y * 4.0) * y;
            	tmp = 0.0;
            	if ((((x * x) - t_3) / ((x * x) + t_3)) < 0.9743233849626781)
            		tmp = ((x * x) / t_1) - t_2;
            	else
            		tmp = ((x / sqrt(t_1)) ^ 2.0) - t_2;
            	end
            	tmp_2 = tmp;
            end
            
            code[x_, y_] := Block[{t$95$0 = N[(N[(y * y), $MachinePrecision] * 4.0), $MachinePrecision]}, Block[{t$95$1 = N[(N[(x * x), $MachinePrecision] + t$95$0), $MachinePrecision]}, Block[{t$95$2 = N[(t$95$0 / t$95$1), $MachinePrecision]}, Block[{t$95$3 = N[(N[(y * 4.0), $MachinePrecision] * y), $MachinePrecision]}, If[Less[N[(N[(N[(x * x), $MachinePrecision] - t$95$3), $MachinePrecision] / N[(N[(x * x), $MachinePrecision] + t$95$3), $MachinePrecision]), $MachinePrecision], 0.9743233849626781], N[(N[(N[(x * x), $MachinePrecision] / t$95$1), $MachinePrecision] - t$95$2), $MachinePrecision], N[(N[Power[N[(x / N[Sqrt[t$95$1], $MachinePrecision]), $MachinePrecision], 2.0], $MachinePrecision] - t$95$2), $MachinePrecision]]]]]]
            
            \begin{array}{l}
            
            \\
            \begin{array}{l}
            t_0 := \left(y \cdot y\right) \cdot 4\\
            t_1 := x \cdot x + t\_0\\
            t_2 := \frac{t\_0}{t\_1}\\
            t_3 := \left(y \cdot 4\right) \cdot y\\
            \mathbf{if}\;\frac{x \cdot x - t\_3}{x \cdot x + t\_3} < 0.9743233849626781:\\
            \;\;\;\;\frac{x \cdot x}{t\_1} - t\_2\\
            
            \mathbf{else}:\\
            \;\;\;\;{\left(\frac{x}{\sqrt{t\_1}}\right)}^{2} - t\_2\\
            
            
            \end{array}
            \end{array}
            

            Reproduce

            ?
            herbie shell --seed 2024223 
            (FPCore (x y)
              :name "Diagrams.TwoD.Arc:arcBetween from diagrams-lib-1.3.0.3"
              :precision binary64
            
              :alt
              (! :herbie-platform default (if (< (/ (- (* x x) (* (* y 4) y)) (+ (* x x) (* (* y 4) y))) 9743233849626781/10000000000000000) (- (/ (* x x) (+ (* x x) (* (* y y) 4))) (/ (* (* y y) 4) (+ (* x x) (* (* y y) 4)))) (- (pow (/ x (sqrt (+ (* x x) (* (* y y) 4)))) 2) (/ (* (* y y) 4) (+ (* x x) (* (* y y) 4))))))
            
              (/ (- (* x x) (* (* y 4.0) y)) (+ (* x x) (* (* y 4.0) y))))