Graphics.Rasterific.Svg.PathConverter:segmentToBezier from rasterific-svg-0.2.3.1, A

Percentage Accurate: 77.4% → 99.5%
Time: 10.7s
Alternatives: 7
Speedup: 3.0×

Specification

?
\[\begin{array}{l} \\ \begin{array}{l} t_0 := \sin \left(x \cdot 0.5\right)\\ \frac{\left(\frac{8}{3} \cdot t_0\right) \cdot t_0}{\sin x} \end{array} \end{array} \]
(FPCore (x)
 :precision binary64
 (let* ((t_0 (sin (* x 0.5)))) (/ (* (* (/ 8.0 3.0) t_0) t_0) (sin x))))
double code(double x) {
	double t_0 = sin((x * 0.5));
	return (((8.0 / 3.0) * t_0) * t_0) / sin(x);
}
real(8) function code(x)
    real(8), intent (in) :: x
    real(8) :: t_0
    t_0 = sin((x * 0.5d0))
    code = (((8.0d0 / 3.0d0) * t_0) * t_0) / sin(x)
end function
public static double code(double x) {
	double t_0 = Math.sin((x * 0.5));
	return (((8.0 / 3.0) * t_0) * t_0) / Math.sin(x);
}
def code(x):
	t_0 = math.sin((x * 0.5))
	return (((8.0 / 3.0) * t_0) * t_0) / math.sin(x)
function code(x)
	t_0 = sin(Float64(x * 0.5))
	return Float64(Float64(Float64(Float64(8.0 / 3.0) * t_0) * t_0) / sin(x))
end
function tmp = code(x)
	t_0 = sin((x * 0.5));
	tmp = (((8.0 / 3.0) * t_0) * t_0) / sin(x);
end
code[x_] := Block[{t$95$0 = N[Sin[N[(x * 0.5), $MachinePrecision]], $MachinePrecision]}, N[(N[(N[(N[(8.0 / 3.0), $MachinePrecision] * t$95$0), $MachinePrecision] * t$95$0), $MachinePrecision] / N[Sin[x], $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}

\\
\begin{array}{l}
t_0 := \sin \left(x \cdot 0.5\right)\\
\frac{\left(\frac{8}{3} \cdot t_0\right) \cdot t_0}{\sin x}
\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 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.

Initial Program: 77.4% accurate, 1.0× speedup?

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \sin \left(x \cdot 0.5\right)\\ \frac{\left(\frac{8}{3} \cdot t_0\right) \cdot t_0}{\sin x} \end{array} \end{array} \]
(FPCore (x)
 :precision binary64
 (let* ((t_0 (sin (* x 0.5)))) (/ (* (* (/ 8.0 3.0) t_0) t_0) (sin x))))
double code(double x) {
	double t_0 = sin((x * 0.5));
	return (((8.0 / 3.0) * t_0) * t_0) / sin(x);
}
real(8) function code(x)
    real(8), intent (in) :: x
    real(8) :: t_0
    t_0 = sin((x * 0.5d0))
    code = (((8.0d0 / 3.0d0) * t_0) * t_0) / sin(x)
end function
public static double code(double x) {
	double t_0 = Math.sin((x * 0.5));
	return (((8.0 / 3.0) * t_0) * t_0) / Math.sin(x);
}
def code(x):
	t_0 = math.sin((x * 0.5))
	return (((8.0 / 3.0) * t_0) * t_0) / math.sin(x)
function code(x)
	t_0 = sin(Float64(x * 0.5))
	return Float64(Float64(Float64(Float64(8.0 / 3.0) * t_0) * t_0) / sin(x))
end
function tmp = code(x)
	t_0 = sin((x * 0.5));
	tmp = (((8.0 / 3.0) * t_0) * t_0) / sin(x);
end
code[x_] := Block[{t$95$0 = N[Sin[N[(x * 0.5), $MachinePrecision]], $MachinePrecision]}, N[(N[(N[(N[(8.0 / 3.0), $MachinePrecision] * t$95$0), $MachinePrecision] * t$95$0), $MachinePrecision] / N[Sin[x], $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}

\\
\begin{array}{l}
t_0 := \sin \left(x \cdot 0.5\right)\\
\frac{\left(\frac{8}{3} \cdot t_0\right) \cdot t_0}{\sin x}
\end{array}
\end{array}

Alternative 1: 99.5% accurate, 1.0× speedup?

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \sin \left(x \cdot 0.5\right)\\ \frac{t_0}{\frac{0.375}{\frac{t_0}{\sin x}}} \end{array} \end{array} \]
(FPCore (x)
 :precision binary64
 (let* ((t_0 (sin (* x 0.5)))) (/ t_0 (/ 0.375 (/ t_0 (sin x))))))
double code(double x) {
	double t_0 = sin((x * 0.5));
	return t_0 / (0.375 / (t_0 / sin(x)));
}
real(8) function code(x)
    real(8), intent (in) :: x
    real(8) :: t_0
    t_0 = sin((x * 0.5d0))
    code = t_0 / (0.375d0 / (t_0 / sin(x)))
end function
public static double code(double x) {
	double t_0 = Math.sin((x * 0.5));
	return t_0 / (0.375 / (t_0 / Math.sin(x)));
}
def code(x):
	t_0 = math.sin((x * 0.5))
	return t_0 / (0.375 / (t_0 / math.sin(x)))
function code(x)
	t_0 = sin(Float64(x * 0.5))
	return Float64(t_0 / Float64(0.375 / Float64(t_0 / sin(x))))
end
function tmp = code(x)
	t_0 = sin((x * 0.5));
	tmp = t_0 / (0.375 / (t_0 / sin(x)));
end
code[x_] := Block[{t$95$0 = N[Sin[N[(x * 0.5), $MachinePrecision]], $MachinePrecision]}, N[(t$95$0 / N[(0.375 / N[(t$95$0 / N[Sin[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}

\\
\begin{array}{l}
t_0 := \sin \left(x \cdot 0.5\right)\\
\frac{t_0}{\frac{0.375}{\frac{t_0}{\sin x}}}
\end{array}
\end{array}
Derivation
  1. Initial program 75.3%

    \[\frac{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \sin \left(x \cdot 0.5\right)}{\sin x} \]
  2. Step-by-step derivation
    1. associate-*r/99.2%

      \[\leadsto \color{blue}{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}} \]
    2. associate-*l*99.3%

      \[\leadsto \color{blue}{\frac{8}{3} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right)} \]
    3. metadata-eval99.3%

      \[\leadsto \color{blue}{2.6666666666666665} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right) \]
  3. Simplified99.3%

    \[\leadsto \color{blue}{2.6666666666666665 \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right)} \]
  4. Step-by-step derivation
    1. associate-*r*99.2%

      \[\leadsto \color{blue}{\left(2.6666666666666665 \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}} \]
    2. metadata-eval99.2%

      \[\leadsto \left(\color{blue}{\frac{8}{3}} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x} \]
    3. associate-*r/75.3%

      \[\leadsto \color{blue}{\frac{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \sin \left(x \cdot 0.5\right)}{\sin x}} \]
    4. associate-/l*99.2%

      \[\leadsto \color{blue}{\frac{\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)}{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}}} \]
    5. metadata-eval99.2%

      \[\leadsto \frac{\color{blue}{2.6666666666666665} \cdot \sin \left(x \cdot 0.5\right)}{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}} \]
    6. *-commutative99.2%

      \[\leadsto \frac{\color{blue}{\sin \left(x \cdot 0.5\right) \cdot 2.6666666666666665}}{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}} \]
    7. associate-/l*99.5%

      \[\leadsto \color{blue}{\frac{\sin \left(x \cdot 0.5\right)}{\frac{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}}{2.6666666666666665}}} \]
  5. Applied egg-rr99.5%

    \[\leadsto \color{blue}{\frac{\sin \left(x \cdot 0.5\right)}{\frac{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}}{2.6666666666666665}}} \]
  6. Taylor expanded in x around inf 99.5%

    \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\color{blue}{0.375 \cdot \frac{\sin x}{\sin \left(0.5 \cdot x\right)}}} \]
  7. Step-by-step derivation
    1. associate-*r/99.4%

      \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\color{blue}{\frac{0.375 \cdot \sin x}{\sin \left(0.5 \cdot x\right)}}} \]
    2. *-commutative99.4%

      \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\frac{0.375 \cdot \sin x}{\sin \color{blue}{\left(x \cdot 0.5\right)}}} \]
    3. associate-/l*99.6%

      \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\color{blue}{\frac{0.375}{\frac{\sin \left(x \cdot 0.5\right)}{\sin x}}}} \]
  8. Simplified99.6%

    \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\color{blue}{\frac{0.375}{\frac{\sin \left(x \cdot 0.5\right)}{\sin x}}}} \]
  9. Final simplification99.6%

    \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\frac{0.375}{\frac{\sin \left(x \cdot 0.5\right)}{\sin x}}} \]

Alternative 2: 99.4% accurate, 1.0× speedup?

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \sin \left(x \cdot 0.5\right)\\ \frac{t_0}{\sin x \cdot \frac{0.375}{t_0}} \end{array} \end{array} \]
(FPCore (x)
 :precision binary64
 (let* ((t_0 (sin (* x 0.5)))) (/ t_0 (* (sin x) (/ 0.375 t_0)))))
double code(double x) {
	double t_0 = sin((x * 0.5));
	return t_0 / (sin(x) * (0.375 / t_0));
}
real(8) function code(x)
    real(8), intent (in) :: x
    real(8) :: t_0
    t_0 = sin((x * 0.5d0))
    code = t_0 / (sin(x) * (0.375d0 / t_0))
end function
public static double code(double x) {
	double t_0 = Math.sin((x * 0.5));
	return t_0 / (Math.sin(x) * (0.375 / t_0));
}
def code(x):
	t_0 = math.sin((x * 0.5))
	return t_0 / (math.sin(x) * (0.375 / t_0))
function code(x)
	t_0 = sin(Float64(x * 0.5))
	return Float64(t_0 / Float64(sin(x) * Float64(0.375 / t_0)))
end
function tmp = code(x)
	t_0 = sin((x * 0.5));
	tmp = t_0 / (sin(x) * (0.375 / t_0));
end
code[x_] := Block[{t$95$0 = N[Sin[N[(x * 0.5), $MachinePrecision]], $MachinePrecision]}, N[(t$95$0 / N[(N[Sin[x], $MachinePrecision] * N[(0.375 / t$95$0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}

\\
\begin{array}{l}
t_0 := \sin \left(x \cdot 0.5\right)\\
\frac{t_0}{\sin x \cdot \frac{0.375}{t_0}}
\end{array}
\end{array}
Derivation
  1. Initial program 75.3%

    \[\frac{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \sin \left(x \cdot 0.5\right)}{\sin x} \]
  2. Step-by-step derivation
    1. associate-*r/99.2%

      \[\leadsto \color{blue}{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}} \]
    2. associate-*l*99.3%

      \[\leadsto \color{blue}{\frac{8}{3} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right)} \]
    3. metadata-eval99.3%

      \[\leadsto \color{blue}{2.6666666666666665} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right) \]
  3. Simplified99.3%

    \[\leadsto \color{blue}{2.6666666666666665 \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right)} \]
  4. Step-by-step derivation
    1. associate-*r*99.2%

      \[\leadsto \color{blue}{\left(2.6666666666666665 \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}} \]
    2. metadata-eval99.2%

      \[\leadsto \left(\color{blue}{\frac{8}{3}} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x} \]
    3. associate-*r/75.3%

      \[\leadsto \color{blue}{\frac{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \sin \left(x \cdot 0.5\right)}{\sin x}} \]
    4. associate-/l*99.2%

      \[\leadsto \color{blue}{\frac{\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)}{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}}} \]
    5. metadata-eval99.2%

      \[\leadsto \frac{\color{blue}{2.6666666666666665} \cdot \sin \left(x \cdot 0.5\right)}{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}} \]
    6. *-commutative99.2%

      \[\leadsto \frac{\color{blue}{\sin \left(x \cdot 0.5\right) \cdot 2.6666666666666665}}{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}} \]
    7. associate-/l*99.5%

      \[\leadsto \color{blue}{\frac{\sin \left(x \cdot 0.5\right)}{\frac{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}}{2.6666666666666665}}} \]
  5. Applied egg-rr99.5%

    \[\leadsto \color{blue}{\frac{\sin \left(x \cdot 0.5\right)}{\frac{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}}{2.6666666666666665}}} \]
  6. Taylor expanded in x around inf 99.5%

    \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\color{blue}{0.375 \cdot \frac{\sin x}{\sin \left(0.5 \cdot x\right)}}} \]
  7. Step-by-step derivation
    1. associate-*r/99.4%

      \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\color{blue}{\frac{0.375 \cdot \sin x}{\sin \left(0.5 \cdot x\right)}}} \]
    2. *-commutative99.4%

      \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\frac{0.375 \cdot \sin x}{\sin \color{blue}{\left(x \cdot 0.5\right)}}} \]
    3. associate-/l*99.6%

      \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\color{blue}{\frac{0.375}{\frac{\sin \left(x \cdot 0.5\right)}{\sin x}}}} \]
  8. Simplified99.6%

    \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\color{blue}{\frac{0.375}{\frac{\sin \left(x \cdot 0.5\right)}{\sin x}}}} \]
  9. Step-by-step derivation
    1. associate-/r/99.5%

      \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\color{blue}{\frac{0.375}{\sin \left(x \cdot 0.5\right)} \cdot \sin x}} \]
  10. Applied egg-rr99.5%

    \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\color{blue}{\frac{0.375}{\sin \left(x \cdot 0.5\right)} \cdot \sin x}} \]
  11. Final simplification99.5%

    \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\sin x \cdot \frac{0.375}{\sin \left(x \cdot 0.5\right)}} \]

Alternative 3: 99.5% accurate, 1.0× speedup?

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \sin \left(x \cdot 0.5\right)\\ \frac{t_0}{0.375 \cdot \frac{\sin x}{t_0}} \end{array} \end{array} \]
(FPCore (x)
 :precision binary64
 (let* ((t_0 (sin (* x 0.5)))) (/ t_0 (* 0.375 (/ (sin x) t_0)))))
double code(double x) {
	double t_0 = sin((x * 0.5));
	return t_0 / (0.375 * (sin(x) / t_0));
}
real(8) function code(x)
    real(8), intent (in) :: x
    real(8) :: t_0
    t_0 = sin((x * 0.5d0))
    code = t_0 / (0.375d0 * (sin(x) / t_0))
end function
public static double code(double x) {
	double t_0 = Math.sin((x * 0.5));
	return t_0 / (0.375 * (Math.sin(x) / t_0));
}
def code(x):
	t_0 = math.sin((x * 0.5))
	return t_0 / (0.375 * (math.sin(x) / t_0))
function code(x)
	t_0 = sin(Float64(x * 0.5))
	return Float64(t_0 / Float64(0.375 * Float64(sin(x) / t_0)))
end
function tmp = code(x)
	t_0 = sin((x * 0.5));
	tmp = t_0 / (0.375 * (sin(x) / t_0));
end
code[x_] := Block[{t$95$0 = N[Sin[N[(x * 0.5), $MachinePrecision]], $MachinePrecision]}, N[(t$95$0 / N[(0.375 * N[(N[Sin[x], $MachinePrecision] / t$95$0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}

\\
\begin{array}{l}
t_0 := \sin \left(x \cdot 0.5\right)\\
\frac{t_0}{0.375 \cdot \frac{\sin x}{t_0}}
\end{array}
\end{array}
Derivation
  1. Initial program 75.3%

    \[\frac{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \sin \left(x \cdot 0.5\right)}{\sin x} \]
  2. Step-by-step derivation
    1. associate-*r/99.2%

      \[\leadsto \color{blue}{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}} \]
    2. associate-*l*99.3%

      \[\leadsto \color{blue}{\frac{8}{3} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right)} \]
    3. metadata-eval99.3%

      \[\leadsto \color{blue}{2.6666666666666665} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right) \]
  3. Simplified99.3%

    \[\leadsto \color{blue}{2.6666666666666665 \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right)} \]
  4. Step-by-step derivation
    1. associate-*r*99.2%

      \[\leadsto \color{blue}{\left(2.6666666666666665 \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}} \]
    2. metadata-eval99.2%

      \[\leadsto \left(\color{blue}{\frac{8}{3}} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x} \]
    3. associate-*r/75.3%

      \[\leadsto \color{blue}{\frac{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \sin \left(x \cdot 0.5\right)}{\sin x}} \]
    4. associate-/l*99.2%

      \[\leadsto \color{blue}{\frac{\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)}{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}}} \]
    5. metadata-eval99.2%

      \[\leadsto \frac{\color{blue}{2.6666666666666665} \cdot \sin \left(x \cdot 0.5\right)}{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}} \]
    6. *-commutative99.2%

      \[\leadsto \frac{\color{blue}{\sin \left(x \cdot 0.5\right) \cdot 2.6666666666666665}}{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}} \]
    7. associate-/l*99.5%

      \[\leadsto \color{blue}{\frac{\sin \left(x \cdot 0.5\right)}{\frac{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}}{2.6666666666666665}}} \]
  5. Applied egg-rr99.5%

    \[\leadsto \color{blue}{\frac{\sin \left(x \cdot 0.5\right)}{\frac{\frac{\sin x}{\sin \left(x \cdot 0.5\right)}}{2.6666666666666665}}} \]
  6. Step-by-step derivation
    1. div-inv99.5%

      \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\color{blue}{\frac{\sin x}{\sin \left(x \cdot 0.5\right)} \cdot \frac{1}{2.6666666666666665}}} \]
    2. metadata-eval99.5%

      \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\frac{\sin x}{\sin \left(x \cdot 0.5\right)} \cdot \color{blue}{0.375}} \]
  7. Applied egg-rr99.5%

    \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{\color{blue}{\frac{\sin x}{\sin \left(x \cdot 0.5\right)} \cdot 0.375}} \]
  8. Final simplification99.5%

    \[\leadsto \frac{\sin \left(x \cdot 0.5\right)}{0.375 \cdot \frac{\sin x}{\sin \left(x \cdot 0.5\right)}} \]

Alternative 4: 99.4% accurate, 3.0× speedup?

\[\begin{array}{l} \\ 1.3333333333333333 \cdot \tan \left(\frac{x}{2}\right) \end{array} \]
(FPCore (x) :precision binary64 (* 1.3333333333333333 (tan (/ x 2.0))))
double code(double x) {
	return 1.3333333333333333 * tan((x / 2.0));
}
real(8) function code(x)
    real(8), intent (in) :: x
    code = 1.3333333333333333d0 * tan((x / 2.0d0))
end function
public static double code(double x) {
	return 1.3333333333333333 * Math.tan((x / 2.0));
}
def code(x):
	return 1.3333333333333333 * math.tan((x / 2.0))
function code(x)
	return Float64(1.3333333333333333 * tan(Float64(x / 2.0)))
end
function tmp = code(x)
	tmp = 1.3333333333333333 * tan((x / 2.0));
end
code[x_] := N[(1.3333333333333333 * N[Tan[N[(x / 2.0), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}

\\
1.3333333333333333 \cdot \tan \left(\frac{x}{2}\right)
\end{array}
Derivation
  1. Initial program 75.3%

    \[\frac{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \sin \left(x \cdot 0.5\right)}{\sin x} \]
  2. Step-by-step derivation
    1. associate-*r/99.2%

      \[\leadsto \color{blue}{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}} \]
    2. associate-*l*99.3%

      \[\leadsto \color{blue}{\frac{8}{3} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right)} \]
    3. metadata-eval99.3%

      \[\leadsto \color{blue}{2.6666666666666665} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right) \]
  3. Simplified99.3%

    \[\leadsto \color{blue}{2.6666666666666665 \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right)} \]
  4. Step-by-step derivation
    1. associate-*r/75.4%

      \[\leadsto 2.6666666666666665 \cdot \color{blue}{\frac{\sin \left(x \cdot 0.5\right) \cdot \sin \left(x \cdot 0.5\right)}{\sin x}} \]
    2. associate-*r/75.3%

      \[\leadsto \color{blue}{\frac{2.6666666666666665 \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \sin \left(x \cdot 0.5\right)\right)}{\sin x}} \]
    3. expm1-log1p-u59.0%

      \[\leadsto \color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{2.6666666666666665 \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \sin \left(x \cdot 0.5\right)\right)}{\sin x}\right)\right)} \]
    4. associate-*l/59.1%

      \[\leadsto \mathsf{expm1}\left(\mathsf{log1p}\left(\color{blue}{\frac{2.6666666666666665}{\sin x} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \sin \left(x \cdot 0.5\right)\right)}\right)\right) \]
    5. expm1-udef35.6%

      \[\leadsto \color{blue}{e^{\mathsf{log1p}\left(\frac{2.6666666666666665}{\sin x} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \sin \left(x \cdot 0.5\right)\right)\right)} - 1} \]
  5. Applied egg-rr35.1%

    \[\leadsto \color{blue}{e^{\mathsf{log1p}\left(2.6666666666666665 \cdot \frac{0.5 + -0.5 \cdot \cos x}{\sin x}\right)} - 1} \]
  6. Step-by-step derivation
    1. expm1-def35.1%

      \[\leadsto \color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(2.6666666666666665 \cdot \frac{0.5 + -0.5 \cdot \cos x}{\sin x}\right)\right)} \]
    2. expm1-log1p51.4%

      \[\leadsto \color{blue}{2.6666666666666665 \cdot \frac{0.5 + -0.5 \cdot \cos x}{\sin x}} \]
    3. associate-*r/51.4%

      \[\leadsto \color{blue}{\frac{2.6666666666666665 \cdot \left(0.5 + -0.5 \cdot \cos x\right)}{\sin x}} \]
    4. associate-*l/51.4%

      \[\leadsto \color{blue}{\frac{2.6666666666666665}{\sin x} \cdot \left(0.5 + -0.5 \cdot \cos x\right)} \]
    5. metadata-eval51.4%

      \[\leadsto \frac{2.6666666666666665}{\sin x} \cdot \left(\color{blue}{0.5 \cdot 1} + -0.5 \cdot \cos x\right) \]
    6. metadata-eval51.4%

      \[\leadsto \frac{2.6666666666666665}{\sin x} \cdot \left(0.5 \cdot 1 + \color{blue}{\left(-0.5\right)} \cdot \cos x\right) \]
    7. distribute-lft-neg-in51.4%

      \[\leadsto \frac{2.6666666666666665}{\sin x} \cdot \left(0.5 \cdot 1 + \color{blue}{\left(-0.5 \cdot \cos x\right)}\right) \]
    8. distribute-rgt-neg-in51.4%

      \[\leadsto \frac{2.6666666666666665}{\sin x} \cdot \left(0.5 \cdot 1 + \color{blue}{0.5 \cdot \left(-\cos x\right)}\right) \]
    9. distribute-lft-in51.4%

      \[\leadsto \frac{2.6666666666666665}{\sin x} \cdot \color{blue}{\left(0.5 \cdot \left(1 + \left(-\cos x\right)\right)\right)} \]
    10. metadata-eval51.4%

      \[\leadsto \frac{2.6666666666666665}{\sin x} \cdot \left(\color{blue}{\frac{1}{2}} \cdot \left(1 + \left(-\cos x\right)\right)\right) \]
    11. sub-neg51.4%

      \[\leadsto \frac{2.6666666666666665}{\sin x} \cdot \left(\frac{1}{2} \cdot \color{blue}{\left(1 - \cos x\right)}\right) \]
    12. cos-051.4%

      \[\leadsto \frac{2.6666666666666665}{\sin x} \cdot \left(\frac{1}{2} \cdot \left(\color{blue}{\cos 0} - \cos x\right)\right) \]
    13. associate-/r/51.3%

      \[\leadsto \frac{2.6666666666666665}{\sin x} \cdot \color{blue}{\frac{1}{\frac{2}{\cos 0 - \cos x}}} \]
    14. associate-/l*51.4%

      \[\leadsto \frac{2.6666666666666665}{\sin x} \cdot \color{blue}{\frac{1 \cdot \left(\cos 0 - \cos x\right)}{2}} \]
    15. *-lft-identity51.4%

      \[\leadsto \frac{2.6666666666666665}{\sin x} \cdot \frac{\color{blue}{\cos 0 - \cos x}}{2} \]
    16. times-frac51.4%

      \[\leadsto \color{blue}{\frac{2.6666666666666665 \cdot \left(\cos 0 - \cos x\right)}{\sin x \cdot 2}} \]
    17. *-commutative51.4%

      \[\leadsto \frac{2.6666666666666665 \cdot \left(\cos 0 - \cos x\right)}{\color{blue}{2 \cdot \sin x}} \]
    18. times-frac51.4%

      \[\leadsto \color{blue}{\frac{2.6666666666666665}{2} \cdot \frac{\cos 0 - \cos x}{\sin x}} \]
    19. metadata-eval51.4%

      \[\leadsto \color{blue}{1.3333333333333333} \cdot \frac{\cos 0 - \cos x}{\sin x} \]
    20. cos-051.4%

      \[\leadsto 1.3333333333333333 \cdot \frac{\color{blue}{1} - \cos x}{\sin x} \]
    21. hang-p0-tan99.4%

      \[\leadsto 1.3333333333333333 \cdot \color{blue}{\tan \left(\frac{x}{2}\right)} \]
  7. Simplified99.4%

    \[\leadsto \color{blue}{1.3333333333333333 \cdot \tan \left(\frac{x}{2}\right)} \]
  8. Final simplification99.4%

    \[\leadsto 1.3333333333333333 \cdot \tan \left(\frac{x}{2}\right) \]

Alternative 5: 50.7% accurate, 28.5× speedup?

\[\begin{array}{l} \\ \frac{2.6666666666666665}{x \cdot -0.3333333333333333 + 4 \cdot \frac{1}{x}} \end{array} \]
(FPCore (x)
 :precision binary64
 (/ 2.6666666666666665 (+ (* x -0.3333333333333333) (* 4.0 (/ 1.0 x)))))
double code(double x) {
	return 2.6666666666666665 / ((x * -0.3333333333333333) + (4.0 * (1.0 / x)));
}
real(8) function code(x)
    real(8), intent (in) :: x
    code = 2.6666666666666665d0 / ((x * (-0.3333333333333333d0)) + (4.0d0 * (1.0d0 / x)))
end function
public static double code(double x) {
	return 2.6666666666666665 / ((x * -0.3333333333333333) + (4.0 * (1.0 / x)));
}
def code(x):
	return 2.6666666666666665 / ((x * -0.3333333333333333) + (4.0 * (1.0 / x)))
function code(x)
	return Float64(2.6666666666666665 / Float64(Float64(x * -0.3333333333333333) + Float64(4.0 * Float64(1.0 / x))))
end
function tmp = code(x)
	tmp = 2.6666666666666665 / ((x * -0.3333333333333333) + (4.0 * (1.0 / x)));
end
code[x_] := N[(2.6666666666666665 / N[(N[(x * -0.3333333333333333), $MachinePrecision] + N[(4.0 * N[(1.0 / x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}

\\
\frac{2.6666666666666665}{x \cdot -0.3333333333333333 + 4 \cdot \frac{1}{x}}
\end{array}
Derivation
  1. Initial program 75.3%

    \[\frac{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \sin \left(x \cdot 0.5\right)}{\sin x} \]
  2. Step-by-step derivation
    1. associate-*r/99.2%

      \[\leadsto \color{blue}{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}} \]
    2. associate-*l*99.3%

      \[\leadsto \color{blue}{\frac{8}{3} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right)} \]
    3. metadata-eval99.3%

      \[\leadsto \color{blue}{2.6666666666666665} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right) \]
  3. Simplified99.3%

    \[\leadsto \color{blue}{2.6666666666666665 \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right)} \]
  4. Step-by-step derivation
    1. associate-*r/75.4%

      \[\leadsto 2.6666666666666665 \cdot \color{blue}{\frac{\sin \left(x \cdot 0.5\right) \cdot \sin \left(x \cdot 0.5\right)}{\sin x}} \]
    2. associate-*r/75.3%

      \[\leadsto \color{blue}{\frac{2.6666666666666665 \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \sin \left(x \cdot 0.5\right)\right)}{\sin x}} \]
    3. associate-/l*75.4%

      \[\leadsto \color{blue}{\frac{2.6666666666666665}{\frac{\sin x}{\sin \left(x \cdot 0.5\right) \cdot \sin \left(x \cdot 0.5\right)}}} \]
    4. sqr-sin-a51.3%

      \[\leadsto \frac{2.6666666666666665}{\frac{\sin x}{\color{blue}{0.5 - 0.5 \cdot \cos \left(2 \cdot \left(x \cdot 0.5\right)\right)}}} \]
    5. cancel-sign-sub-inv51.3%

      \[\leadsto \frac{2.6666666666666665}{\frac{\sin x}{\color{blue}{0.5 + \left(-0.5\right) \cdot \cos \left(2 \cdot \left(x \cdot 0.5\right)\right)}}} \]
    6. metadata-eval51.3%

      \[\leadsto \frac{2.6666666666666665}{\frac{\sin x}{0.5 + \color{blue}{-0.5} \cdot \cos \left(2 \cdot \left(x \cdot 0.5\right)\right)}} \]
    7. *-commutative51.3%

      \[\leadsto \frac{2.6666666666666665}{\frac{\sin x}{0.5 + -0.5 \cdot \cos \left(2 \cdot \color{blue}{\left(0.5 \cdot x\right)}\right)}} \]
    8. associate-*r*51.3%

      \[\leadsto \frac{2.6666666666666665}{\frac{\sin x}{0.5 + -0.5 \cdot \cos \color{blue}{\left(\left(2 \cdot 0.5\right) \cdot x\right)}}} \]
    9. metadata-eval51.3%

      \[\leadsto \frac{2.6666666666666665}{\frac{\sin x}{0.5 + -0.5 \cdot \cos \left(\color{blue}{1} \cdot x\right)}} \]
    10. *-un-lft-identity51.3%

      \[\leadsto \frac{2.6666666666666665}{\frac{\sin x}{0.5 + -0.5 \cdot \cos \color{blue}{x}}} \]
  5. Applied egg-rr51.3%

    \[\leadsto \color{blue}{\frac{2.6666666666666665}{\frac{\sin x}{0.5 + -0.5 \cdot \cos x}}} \]
  6. Taylor expanded in x around 0 52.6%

    \[\leadsto \frac{2.6666666666666665}{\color{blue}{-0.3333333333333333 \cdot x + 4 \cdot \frac{1}{x}}} \]
  7. Final simplification52.6%

    \[\leadsto \frac{2.6666666666666665}{x \cdot -0.3333333333333333 + 4 \cdot \frac{1}{x}} \]

Alternative 6: 50.2% accurate, 62.6× speedup?

\[\begin{array}{l} \\ \frac{1}{\frac{1.5}{x}} \end{array} \]
(FPCore (x) :precision binary64 (/ 1.0 (/ 1.5 x)))
double code(double x) {
	return 1.0 / (1.5 / x);
}
real(8) function code(x)
    real(8), intent (in) :: x
    code = 1.0d0 / (1.5d0 / x)
end function
public static double code(double x) {
	return 1.0 / (1.5 / x);
}
def code(x):
	return 1.0 / (1.5 / x)
function code(x)
	return Float64(1.0 / Float64(1.5 / x))
end
function tmp = code(x)
	tmp = 1.0 / (1.5 / x);
end
code[x_] := N[(1.0 / N[(1.5 / x), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}

\\
\frac{1}{\frac{1.5}{x}}
\end{array}
Derivation
  1. Initial program 75.3%

    \[\frac{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \sin \left(x \cdot 0.5\right)}{\sin x} \]
  2. Step-by-step derivation
    1. associate-*l*75.3%

      \[\leadsto \frac{\color{blue}{\frac{8}{3} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \sin \left(x \cdot 0.5\right)\right)}}{\sin x} \]
    2. metadata-eval75.3%

      \[\leadsto \frac{\color{blue}{2.6666666666666665} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \sin \left(x \cdot 0.5\right)\right)}{\sin x} \]
  3. Simplified75.3%

    \[\leadsto \color{blue}{\frac{2.6666666666666665 \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \sin \left(x \cdot 0.5\right)\right)}{\sin x}} \]
  4. Step-by-step derivation
    1. sin-mult51.4%

      \[\leadsto \frac{2.6666666666666665 \cdot \color{blue}{\frac{\cos \left(x \cdot 0.5 - x \cdot 0.5\right) - \cos \left(x \cdot 0.5 + x \cdot 0.5\right)}{2}}}{\sin x} \]
    2. associate-*r/51.4%

      \[\leadsto \frac{\color{blue}{\frac{2.6666666666666665 \cdot \left(\cos \left(x \cdot 0.5 - x \cdot 0.5\right) - \cos \left(x \cdot 0.5 + x \cdot 0.5\right)\right)}{2}}}{\sin x} \]
    3. +-inverses51.4%

      \[\leadsto \frac{\frac{2.6666666666666665 \cdot \left(\cos \color{blue}{0} - \cos \left(x \cdot 0.5 + x \cdot 0.5\right)\right)}{2}}{\sin x} \]
    4. cos-sum51.1%

      \[\leadsto \frac{\frac{2.6666666666666665 \cdot \left(\cos 0 - \color{blue}{\left(\cos \left(x \cdot 0.5\right) \cdot \cos \left(x \cdot 0.5\right) - \sin \left(x \cdot 0.5\right) \cdot \sin \left(x \cdot 0.5\right)\right)}\right)}{2}}{\sin x} \]
    5. cos-251.4%

      \[\leadsto \frac{\frac{2.6666666666666665 \cdot \left(\cos 0 - \color{blue}{\cos \left(2 \cdot \left(x \cdot 0.5\right)\right)}\right)}{2}}{\sin x} \]
    6. *-commutative51.4%

      \[\leadsto \frac{\frac{2.6666666666666665 \cdot \left(\cos 0 - \cos \left(2 \cdot \color{blue}{\left(0.5 \cdot x\right)}\right)\right)}{2}}{\sin x} \]
    7. associate-*r*51.4%

      \[\leadsto \frac{\frac{2.6666666666666665 \cdot \left(\cos 0 - \cos \color{blue}{\left(\left(2 \cdot 0.5\right) \cdot x\right)}\right)}{2}}{\sin x} \]
    8. metadata-eval51.4%

      \[\leadsto \frac{\frac{2.6666666666666665 \cdot \left(\cos 0 - \cos \left(\color{blue}{1} \cdot x\right)\right)}{2}}{\sin x} \]
    9. *-un-lft-identity51.4%

      \[\leadsto \frac{\frac{2.6666666666666665 \cdot \left(\cos 0 - \cos \color{blue}{x}\right)}{2}}{\sin x} \]
  5. Applied egg-rr51.4%

    \[\leadsto \frac{\color{blue}{\frac{2.6666666666666665 \cdot \left(\cos 0 - \cos x\right)}{2}}}{\sin x} \]
  6. Step-by-step derivation
    1. *-commutative51.4%

      \[\leadsto \frac{\frac{\color{blue}{\left(\cos 0 - \cos x\right) \cdot 2.6666666666666665}}{2}}{\sin x} \]
    2. associate-/l*51.4%

      \[\leadsto \frac{\color{blue}{\frac{\cos 0 - \cos x}{\frac{2}{2.6666666666666665}}}}{\sin x} \]
    3. cos-051.4%

      \[\leadsto \frac{\frac{\color{blue}{1} - \cos x}{\frac{2}{2.6666666666666665}}}{\sin x} \]
    4. metadata-eval51.4%

      \[\leadsto \frac{\frac{1 - \cos x}{\color{blue}{0.75}}}{\sin x} \]
    5. metadata-eval51.4%

      \[\leadsto \frac{\frac{1 - \cos x}{\color{blue}{0.375 \cdot 2}}}{\sin x} \]
    6. div-sub51.3%

      \[\leadsto \frac{\color{blue}{\frac{1}{0.375 \cdot 2} - \frac{\cos x}{0.375 \cdot 2}}}{\sin x} \]
    7. metadata-eval51.3%

      \[\leadsto \frac{\frac{1}{\color{blue}{0.75}} - \frac{\cos x}{0.375 \cdot 2}}{\sin x} \]
    8. metadata-eval51.3%

      \[\leadsto \frac{\color{blue}{1.3333333333333333} - \frac{\cos x}{0.375 \cdot 2}}{\sin x} \]
    9. metadata-eval51.3%

      \[\leadsto \frac{1.3333333333333333 - \frac{\cos x}{\color{blue}{0.75}}}{\sin x} \]
  7. Simplified51.3%

    \[\leadsto \frac{\color{blue}{1.3333333333333333 - \frac{\cos x}{0.75}}}{\sin x} \]
  8. Step-by-step derivation
    1. clear-num51.3%

      \[\leadsto \color{blue}{\frac{1}{\frac{\sin x}{1.3333333333333333 - \frac{\cos x}{0.75}}}} \]
    2. inv-pow51.3%

      \[\leadsto \color{blue}{{\left(\frac{\sin x}{1.3333333333333333 - \frac{\cos x}{0.75}}\right)}^{-1}} \]
    3. div-inv51.3%

      \[\leadsto {\left(\frac{\sin x}{1.3333333333333333 - \color{blue}{\cos x \cdot \frac{1}{0.75}}}\right)}^{-1} \]
    4. metadata-eval51.3%

      \[\leadsto {\left(\frac{\sin x}{1.3333333333333333 - \cos x \cdot \color{blue}{1.3333333333333333}}\right)}^{-1} \]
  9. Applied egg-rr51.3%

    \[\leadsto \color{blue}{{\left(\frac{\sin x}{1.3333333333333333 - \cos x \cdot 1.3333333333333333}\right)}^{-1}} \]
  10. Taylor expanded in x around 0 52.2%

    \[\leadsto {\color{blue}{\left(\frac{1.5}{x}\right)}}^{-1} \]
  11. Step-by-step derivation
    1. unpow-152.2%

      \[\leadsto \color{blue}{\frac{1}{\frac{1.5}{x}}} \]
  12. Applied egg-rr52.2%

    \[\leadsto \color{blue}{\frac{1}{\frac{1.5}{x}}} \]
  13. Final simplification52.2%

    \[\leadsto \frac{1}{\frac{1.5}{x}} \]

Alternative 7: 50.1% accurate, 104.3× speedup?

\[\begin{array}{l} \\ x \cdot 0.6666666666666666 \end{array} \]
(FPCore (x) :precision binary64 (* x 0.6666666666666666))
double code(double x) {
	return x * 0.6666666666666666;
}
real(8) function code(x)
    real(8), intent (in) :: x
    code = x * 0.6666666666666666d0
end function
public static double code(double x) {
	return x * 0.6666666666666666;
}
def code(x):
	return x * 0.6666666666666666
function code(x)
	return Float64(x * 0.6666666666666666)
end
function tmp = code(x)
	tmp = x * 0.6666666666666666;
end
code[x_] := N[(x * 0.6666666666666666), $MachinePrecision]
\begin{array}{l}

\\
x \cdot 0.6666666666666666
\end{array}
Derivation
  1. Initial program 75.3%

    \[\frac{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \sin \left(x \cdot 0.5\right)}{\sin x} \]
  2. Step-by-step derivation
    1. associate-*r/99.2%

      \[\leadsto \color{blue}{\left(\frac{8}{3} \cdot \sin \left(x \cdot 0.5\right)\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}} \]
    2. associate-*l*99.3%

      \[\leadsto \color{blue}{\frac{8}{3} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right)} \]
    3. metadata-eval99.3%

      \[\leadsto \color{blue}{2.6666666666666665} \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right) \]
  3. Simplified99.3%

    \[\leadsto \color{blue}{2.6666666666666665 \cdot \left(\sin \left(x \cdot 0.5\right) \cdot \frac{\sin \left(x \cdot 0.5\right)}{\sin x}\right)} \]
  4. Taylor expanded in x around 0 52.1%

    \[\leadsto \color{blue}{0.6666666666666666 \cdot x} \]
  5. Final simplification52.1%

    \[\leadsto x \cdot 0.6666666666666666 \]

Developer target: 99.5% accurate, 1.0× speedup?

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \sin \left(x \cdot 0.5\right)\\ \frac{\frac{8 \cdot t_0}{3}}{\frac{\sin x}{t_0}} \end{array} \end{array} \]
(FPCore (x)
 :precision binary64
 (let* ((t_0 (sin (* x 0.5)))) (/ (/ (* 8.0 t_0) 3.0) (/ (sin x) t_0))))
double code(double x) {
	double t_0 = sin((x * 0.5));
	return ((8.0 * t_0) / 3.0) / (sin(x) / t_0);
}
real(8) function code(x)
    real(8), intent (in) :: x
    real(8) :: t_0
    t_0 = sin((x * 0.5d0))
    code = ((8.0d0 * t_0) / 3.0d0) / (sin(x) / t_0)
end function
public static double code(double x) {
	double t_0 = Math.sin((x * 0.5));
	return ((8.0 * t_0) / 3.0) / (Math.sin(x) / t_0);
}
def code(x):
	t_0 = math.sin((x * 0.5))
	return ((8.0 * t_0) / 3.0) / (math.sin(x) / t_0)
function code(x)
	t_0 = sin(Float64(x * 0.5))
	return Float64(Float64(Float64(8.0 * t_0) / 3.0) / Float64(sin(x) / t_0))
end
function tmp = code(x)
	t_0 = sin((x * 0.5));
	tmp = ((8.0 * t_0) / 3.0) / (sin(x) / t_0);
end
code[x_] := Block[{t$95$0 = N[Sin[N[(x * 0.5), $MachinePrecision]], $MachinePrecision]}, N[(N[(N[(8.0 * t$95$0), $MachinePrecision] / 3.0), $MachinePrecision] / N[(N[Sin[x], $MachinePrecision] / t$95$0), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}

\\
\begin{array}{l}
t_0 := \sin \left(x \cdot 0.5\right)\\
\frac{\frac{8 \cdot t_0}{3}}{\frac{\sin x}{t_0}}
\end{array}
\end{array}

Reproduce

?
herbie shell --seed 2023240 
(FPCore (x)
  :name "Graphics.Rasterific.Svg.PathConverter:segmentToBezier from rasterific-svg-0.2.3.1, A"
  :precision binary64

  :herbie-target
  (/ (/ (* 8.0 (sin (* x 0.5))) 3.0) (/ (sin x) (sin (* x 0.5))))

  (/ (* (* (/ 8.0 3.0) (sin (* x 0.5))) (sin (* x 0.5))) (sin x)))