normal distribution

Percentage Accurate: 99.4% → 99.6%

Time: 10.1s

Alternatives: 4

Speedup: 1.0×

Specification

\[\left(0 \leq u1 \land u1 \leq 1\right) \land \left(0 \leq u2 \land u2 \leq 1\right)\]

Math

\[\begin{array}{l} \\ \left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \end{array} \]

FPCore

(FPCore (u1 u2)
 :precision binary64
 (+
  (* (* (/ 1.0 6.0) (pow (* -2.0 (log u1)) 0.5)) (cos (* (* 2.0 PI) u2)))
  0.5))

C

double code(double u1, double u2) {
	return (((1.0 / 6.0) * pow((-2.0 * log(u1)), 0.5)) * cos(((2.0 * ((double) M_PI)) * u2))) + 0.5;
}

Java

public static double code(double u1, double u2) {
	return (((1.0 / 6.0) * Math.pow((-2.0 * Math.log(u1)), 0.5)) * Math.cos(((2.0 * Math.PI) * u2))) + 0.5;
}

Python

def code(u1, u2):
	return (((1.0 / 6.0) * math.pow((-2.0 * math.log(u1)), 0.5)) * math.cos(((2.0 * math.pi) * u2))) + 0.5

Julia

function code(u1, u2)
	return Float64(Float64(Float64(Float64(1.0 / 6.0) * (Float64(-2.0 * log(u1)) ^ 0.5)) * cos(Float64(Float64(2.0 * pi) * u2))) + 0.5)
end

MATLAB

function tmp = code(u1, u2)
	tmp = (((1.0 / 6.0) * ((-2.0 * log(u1)) ^ 0.5)) * cos(((2.0 * pi) * u2))) + 0.5;
end

Wolfram

code[u1_, u2_] := N[(N[(N[(N[(1.0 / 6.0), $MachinePrecision] * N[Power[N[(-2.0 * N[Log[u1], $MachinePrecision]), $MachinePrecision], 0.5], $MachinePrecision]), $MachinePrecision] * N[Cos[N[(N[(2.0 * Pi), $MachinePrecision] * u2), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] + 0.5), $MachinePrecision]

Initial Program: 99.4% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \end{array} \]

FPCore

(FPCore (u1 u2)
 :precision binary64
 (+
  (* (* (/ 1.0 6.0) (pow (* -2.0 (log u1)) 0.5)) (cos (* (* 2.0 PI) u2)))
  0.5))

C

double code(double u1, double u2) {
	return (((1.0 / 6.0) * pow((-2.0 * log(u1)), 0.5)) * cos(((2.0 * ((double) M_PI)) * u2))) + 0.5;
}

Java

public static double code(double u1, double u2) {
	return (((1.0 / 6.0) * Math.pow((-2.0 * Math.log(u1)), 0.5)) * Math.cos(((2.0 * Math.PI) * u2))) + 0.5;
}

Python

def code(u1, u2):
	return (((1.0 / 6.0) * math.pow((-2.0 * math.log(u1)), 0.5)) * math.cos(((2.0 * math.pi) * u2))) + 0.5

Julia

function code(u1, u2)
	return Float64(Float64(Float64(Float64(1.0 / 6.0) * (Float64(-2.0 * log(u1)) ^ 0.5)) * cos(Float64(Float64(2.0 * pi) * u2))) + 0.5)
end

MATLAB

function tmp = code(u1, u2)
	tmp = (((1.0 / 6.0) * ((-2.0 * log(u1)) ^ 0.5)) * cos(((2.0 * pi) * u2))) + 0.5;
end

Wolfram

code[u1_, u2_] := N[(N[(N[(N[(1.0 / 6.0), $MachinePrecision] * N[Power[N[(-2.0 * N[Log[u1], $MachinePrecision]), $MachinePrecision], 0.5], $MachinePrecision]), $MachinePrecision] * N[Cos[N[(N[(2.0 * Pi), $MachinePrecision] * u2), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] + 0.5), $MachinePrecision]

Alternative 1: 99.6% accurate, 0.8× speedup

Math

\[\begin{array}{l} \\ \sqrt{{\cos \left(u2 \cdot \left(2 \cdot \pi\right)\right)}^{2} \cdot \left(\log u1 \cdot -0.05555555555555555\right)} + 0.5 \end{array} \]

FPCore

(FPCore (u1 u2)
 :precision binary64
 (+
  (sqrt
   (* (pow (cos (* u2 (* 2.0 PI))) 2.0) (* (log u1) -0.05555555555555555)))
  0.5))

C

double code(double u1, double u2) {
	return sqrt((pow(cos((u2 * (2.0 * ((double) M_PI)))), 2.0) * (log(u1) * -0.05555555555555555))) + 0.5;
}

Java

public static double code(double u1, double u2) {
	return Math.sqrt((Math.pow(Math.cos((u2 * (2.0 * Math.PI))), 2.0) * (Math.log(u1) * -0.05555555555555555))) + 0.5;
}

Python

def code(u1, u2):
	return math.sqrt((math.pow(math.cos((u2 * (2.0 * math.pi))), 2.0) * (math.log(u1) * -0.05555555555555555))) + 0.5

Julia

function code(u1, u2)
	return Float64(sqrt(Float64((cos(Float64(u2 * Float64(2.0 * pi))) ^ 2.0) * Float64(log(u1) * -0.05555555555555555))) + 0.5)
end

MATLAB

function tmp = code(u1, u2)
	tmp = sqrt(((cos((u2 * (2.0 * pi))) ^ 2.0) * (log(u1) * -0.05555555555555555))) + 0.5;
end

Wolfram

code[u1_, u2_] := N[(N[Sqrt[N[(N[Power[N[Cos[N[(u2 * N[(2.0 * Pi), $MachinePrecision]), $MachinePrecision]], $MachinePrecision], 2.0], $MachinePrecision] * N[(N[Log[u1], $MachinePrecision] * -0.05555555555555555), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] + 0.5), $MachinePrecision]

Derivation

1. Initial program 99.5%

   \[\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]
2. Step-by-step derivation

   1. add-sqr-sqrt 99.0%

      \[\leadsto \color{blue}{\sqrt{\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right)} \cdot \sqrt{\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right)}} + 0.5 \]

   2. sqrt-unprod 99.5%

      \[\leadsto \color{blue}{\sqrt{\left(\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right)\right) \cdot \left(\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right)\right)}} + 0.5 \]

   3. pow1/2 99.5%

      \[\leadsto \sqrt{\left(\left(\frac{1}{6} \cdot \color{blue}{\sqrt{-2 \cdot \log u1}}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right)\right) \cdot \left(\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right)\right)} + 0.5 \]

   4. pow1/2 99.5%

      \[\leadsto \sqrt{\left(\left(\frac{1}{6} \cdot \sqrt{-2 \cdot \log u1}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right)\right) \cdot \left(\left(\frac{1}{6} \cdot \color{blue}{\sqrt{-2 \cdot \log u1}}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right)\right)} + 0.5 \]

   5. swap-sqr 99.5%

      \[\leadsto \sqrt{\color{blue}{\left(\left(\frac{1}{6} \cdot \sqrt{-2 \cdot \log u1}\right) \cdot \left(\frac{1}{6} \cdot \sqrt{-2 \cdot \log u1}\right)\right) \cdot \left(\cos \left(\left(2 \cdot \pi\right) \cdot u2\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right)\right)}} + 0.5 \]

3. Applied egg-rr 99.6%

   \[\leadsto \color{blue}{\sqrt{\left(\left(-2 \cdot \log u1\right) \cdot 0.027777777777777776\right) \cdot {\cos \left(2 \cdot \left(\pi \cdot u2\right)\right)}^{2}}} + 0.5 \]
4. Step-by-step derivation

   1. *-commutative 99.6%

      \[\leadsto \sqrt{\color{blue}{{\cos \left(2 \cdot \left(\pi \cdot u2\right)\right)}^{2} \cdot \left(\left(-2 \cdot \log u1\right) \cdot 0.027777777777777776\right)}} + 0.5 \]

   2. associate-*r* 99.6%

      \[\leadsto \sqrt{{\cos \color{blue}{\left(\left(2 \cdot \pi\right) \cdot u2\right)}}^{2} \cdot \left(\left(-2 \cdot \log u1\right) \cdot 0.027777777777777776\right)} + 0.5 \]

   3. *-commutative 99.6%

      \[\leadsto \sqrt{{\cos \color{blue}{\left(u2 \cdot \left(2 \cdot \pi\right)\right)}}^{2} \cdot \left(\left(-2 \cdot \log u1\right) \cdot 0.027777777777777776\right)} + 0.5 \]

   4. *-commutative 99.6%

      \[\leadsto \sqrt{{\cos \left(u2 \cdot \left(2 \cdot \pi\right)\right)}^{2} \cdot \left(\color{blue}{\left(\log u1 \cdot -2\right)} \cdot 0.027777777777777776\right)} + 0.5 \]

   5. associate-*l* 99.6%

      \[\leadsto \sqrt{{\cos \left(u2 \cdot \left(2 \cdot \pi\right)\right)}^{2} \cdot \color{blue}{\left(\log u1 \cdot \left(-2 \cdot 0.027777777777777776\right)\right)}} + 0.5 \]

   6. metadata-eval 99.6%

      \[\leadsto \sqrt{{\cos \left(u2 \cdot \left(2 \cdot \pi\right)\right)}^{2} \cdot \left(\log u1 \cdot \color{blue}{-0.05555555555555555}\right)} + 0.5 \]

5. Simplified 99.6%

   \[\leadsto \color{blue}{\sqrt{{\cos \left(u2 \cdot \left(2 \cdot \pi\right)\right)}^{2} \cdot \left(\log u1 \cdot -0.05555555555555555\right)}} + 0.5 \]

6. Final simplification 99.6%

   \[\leadsto \sqrt{{\cos \left(u2 \cdot \left(2 \cdot \pi\right)\right)}^{2} \cdot \left(\log u1 \cdot -0.05555555555555555\right)} + 0.5 \]

Alternative 2: 99.7% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ 0.5 + \sqrt{\log u1 \cdot -0.05555555555555555} \cdot \cos \left(u2 \cdot \left(2 \cdot \pi\right)\right) \end{array} \]

FPCore

(FPCore (u1 u2)
 :precision binary64
 (+ 0.5 (* (sqrt (* (log u1) -0.05555555555555555)) (cos (* u2 (* 2.0 PI))))))

C

double code(double u1, double u2) {
	return 0.5 + (sqrt((log(u1) * -0.05555555555555555)) * cos((u2 * (2.0 * ((double) M_PI)))));
}

Java

public static double code(double u1, double u2) {
	return 0.5 + (Math.sqrt((Math.log(u1) * -0.05555555555555555)) * Math.cos((u2 * (2.0 * Math.PI))));
}

Python

def code(u1, u2):
	return 0.5 + (math.sqrt((math.log(u1) * -0.05555555555555555)) * math.cos((u2 * (2.0 * math.pi))))

Julia

function code(u1, u2)
	return Float64(0.5 + Float64(sqrt(Float64(log(u1) * -0.05555555555555555)) * cos(Float64(u2 * Float64(2.0 * pi)))))
end

MATLAB

function tmp = code(u1, u2)
	tmp = 0.5 + (sqrt((log(u1) * -0.05555555555555555)) * cos((u2 * (2.0 * pi))));
end

Wolfram

code[u1_, u2_] := N[(0.5 + N[(N[Sqrt[N[(N[Log[u1], $MachinePrecision] * -0.05555555555555555), $MachinePrecision]], $MachinePrecision] * N[Cos[N[(u2 * N[(2.0 * Pi), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.5%

   \[\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]
2. Step-by-step derivation

   1. pow1/2 99.5%

      \[\leadsto \left(\frac{1}{6} \cdot \color{blue}{\sqrt{-2 \cdot \log u1}}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   2. add-sqr-sqrt 99.0%

      \[\leadsto \color{blue}{\left(\sqrt{\frac{1}{6} \cdot \sqrt{-2 \cdot \log u1}} \cdot \sqrt{\frac{1}{6} \cdot \sqrt{-2 \cdot \log u1}}\right)} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   3. sqrt-unprod 99.5%

      \[\leadsto \color{blue}{\sqrt{\left(\frac{1}{6} \cdot \sqrt{-2 \cdot \log u1}\right) \cdot \left(\frac{1}{6} \cdot \sqrt{-2 \cdot \log u1}\right)}} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   4. *-commutative 99.5%

      \[\leadsto \sqrt{\color{blue}{\left(\sqrt{-2 \cdot \log u1} \cdot \frac{1}{6}\right)} \cdot \left(\frac{1}{6} \cdot \sqrt{-2 \cdot \log u1}\right)} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   5. *-commutative 99.5%

      \[\leadsto \sqrt{\left(\sqrt{-2 \cdot \log u1} \cdot \frac{1}{6}\right) \cdot \color{blue}{\left(\sqrt{-2 \cdot \log u1} \cdot \frac{1}{6}\right)}} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   6. swap-sqr 99.4%

      \[\leadsto \sqrt{\color{blue}{\left(\sqrt{-2 \cdot \log u1} \cdot \sqrt{-2 \cdot \log u1}\right) \cdot \left(\frac{1}{6} \cdot \frac{1}{6}\right)}} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   7. add-sqr-sqrt 99.6%

      \[\leadsto \sqrt{\color{blue}{\left(-2 \cdot \log u1\right)} \cdot \left(\frac{1}{6} \cdot \frac{1}{6}\right)} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   8. metadata-eval 99.6%

      \[\leadsto \sqrt{\left(-2 \cdot \log u1\right) \cdot \left(\color{blue}{0.16666666666666666} \cdot \frac{1}{6}\right)} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   9. metadata-eval 99.6%

      \[\leadsto \sqrt{\left(-2 \cdot \log u1\right) \cdot \left(0.16666666666666666 \cdot \color{blue}{0.16666666666666666}\right)} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   10. metadata-eval 99.6%

       \[\leadsto \sqrt{\left(-2 \cdot \log u1\right) \cdot \color{blue}{0.027777777777777776}} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

3. Applied egg-rr 99.6%

   \[\leadsto \color{blue}{\sqrt{\left(-2 \cdot \log u1\right) \cdot 0.027777777777777776}} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]
4. Step-by-step derivation

   1. *-commutative 99.6%

      \[\leadsto \sqrt{\color{blue}{\left(\log u1 \cdot -2\right)} \cdot 0.027777777777777776} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   2. associate-*l* 99.6%

      \[\leadsto \sqrt{\color{blue}{\log u1 \cdot \left(-2 \cdot 0.027777777777777776\right)}} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   3. metadata-eval 99.6%

      \[\leadsto \sqrt{\log u1 \cdot \color{blue}{-0.05555555555555555}} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

5. Simplified 99.6%

   \[\leadsto \color{blue}{\sqrt{\log u1 \cdot -0.05555555555555555}} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

6. Final simplification 99.6%

   \[\leadsto 0.5 + \sqrt{\log u1 \cdot -0.05555555555555555} \cdot \cos \left(u2 \cdot \left(2 \cdot \pi\right)\right) \]

Alternative 3: 98.4% accurate, 1.4× speedup

Math

\[\begin{array}{l} \\ 0.5 + \sqrt{\log \left({u1}^{-0.05555555555555555}\right)} \end{array} \]

FPCore

(FPCore (u1 u2)
 :precision binary64
 (+ 0.5 (sqrt (log (pow u1 -0.05555555555555555)))))

C

double code(double u1, double u2) {
	return 0.5 + sqrt(log(pow(u1, -0.05555555555555555)));
}

Fortran

real(8) function code(u1, u2)
    real(8), intent (in) :: u1
    real(8), intent (in) :: u2
    code = 0.5d0 + sqrt(log((u1 ** (-0.05555555555555555d0))))
end function

Java

public static double code(double u1, double u2) {
	return 0.5 + Math.sqrt(Math.log(Math.pow(u1, -0.05555555555555555)));
}

Python

def code(u1, u2):
	return 0.5 + math.sqrt(math.log(math.pow(u1, -0.05555555555555555)))

Julia

function code(u1, u2)
	return Float64(0.5 + sqrt(log((u1 ^ -0.05555555555555555))))
end

MATLAB

function tmp = code(u1, u2)
	tmp = 0.5 + sqrt(log((u1 ^ -0.05555555555555555)));
end

Wolfram

code[u1_, u2_] := N[(0.5 + N[Sqrt[N[Log[N[Power[u1, -0.05555555555555555], $MachinePrecision]], $MachinePrecision]], $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.5%

   \[\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]
2. Step-by-step derivation

   1. *-commutative 99.5%

      \[\leadsto \color{blue}{\left({\left(-2 \cdot \log u1\right)}^{0.5} \cdot \frac{1}{6}\right)} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   2. associate-*l* 99.5%

      \[\leadsto \color{blue}{{\left(-2 \cdot \log u1\right)}^{0.5} \cdot \left(\frac{1}{6} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right)\right)} + 0.5 \]

   3. fma-def 99.5%

      \[\leadsto \color{blue}{\mathsf{fma}\left({\left(-2 \cdot \log u1\right)}^{0.5}, \frac{1}{6} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right), 0.5\right)} \]

   4. unpow1/2 99.5%

      \[\leadsto \mathsf{fma}\left(\color{blue}{\sqrt{-2 \cdot \log u1}}, \frac{1}{6} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right), 0.5\right) \]

   5. metadata-eval 99.5%

      \[\leadsto \mathsf{fma}\left(\sqrt{-2 \cdot \log u1}, \color{blue}{0.16666666666666666} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right), 0.5\right) \]

   6. *-commutative 99.5%

      \[\leadsto \mathsf{fma}\left(\sqrt{-2 \cdot \log u1}, 0.16666666666666666 \cdot \cos \left(\color{blue}{\left(\pi \cdot 2\right)} \cdot u2\right), 0.5\right) \]

   7. associate-*l* 99.5%

      \[\leadsto \mathsf{fma}\left(\sqrt{-2 \cdot \log u1}, 0.16666666666666666 \cdot \cos \color{blue}{\left(\pi \cdot \left(2 \cdot u2\right)\right)}, 0.5\right) \]

3. Simplified 99.5%

   \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{-2 \cdot \log u1}, 0.16666666666666666 \cdot \cos \left(\pi \cdot \left(2 \cdot u2\right)\right), 0.5\right)} \]

4. Taylor expanded in u2 around 0 98.5%

   \[\leadsto \mathsf{fma}\left(\sqrt{-2 \cdot \log u1}, \color{blue}{0.16666666666666666}, 0.5\right) \]
5. Step-by-step derivation

   1. fma-udef 98.5%

      \[\leadsto \color{blue}{\sqrt{-2 \cdot \log u1} \cdot 0.16666666666666666 + 0.5} \]

   2. *-commutative 98.5%

      \[\leadsto \sqrt{\color{blue}{\log u1 \cdot -2}} \cdot 0.16666666666666666 + 0.5 \]

6. Applied egg-rr 98.5%

   \[\leadsto \color{blue}{\sqrt{\log u1 \cdot -2} \cdot 0.16666666666666666 + 0.5} \]
7. Step-by-step derivation

   1. add-sqr-sqrt 98.1%

      \[\leadsto \color{blue}{\sqrt{\sqrt{\log u1 \cdot -2} \cdot 0.16666666666666666} \cdot \sqrt{\sqrt{\log u1 \cdot -2} \cdot 0.16666666666666666}} + 0.5 \]

   2. sqrt-unprod 98.5%

      \[\leadsto \color{blue}{\sqrt{\left(\sqrt{\log u1 \cdot -2} \cdot 0.16666666666666666\right) \cdot \left(\sqrt{\log u1 \cdot -2} \cdot 0.16666666666666666\right)}} + 0.5 \]

   3. swap-sqr 98.5%

      \[\leadsto \sqrt{\color{blue}{\left(\sqrt{\log u1 \cdot -2} \cdot \sqrt{\log u1 \cdot -2}\right) \cdot \left(0.16666666666666666 \cdot 0.16666666666666666\right)}} + 0.5 \]

   4. add-sqr-sqrt 98.7%

      \[\leadsto \sqrt{\color{blue}{\left(\log u1 \cdot -2\right)} \cdot \left(0.16666666666666666 \cdot 0.16666666666666666\right)} + 0.5 \]

   5. metadata-eval 98.7%

      \[\leadsto \sqrt{\left(\log u1 \cdot -2\right) \cdot \color{blue}{0.027777777777777776}} + 0.5 \]

8. Applied egg-rr 98.7%

   \[\leadsto \color{blue}{\sqrt{\left(\log u1 \cdot -2\right) \cdot 0.027777777777777776}} + 0.5 \]
9. Step-by-step derivation

   1. add-log-exp 98.7%

      \[\leadsto \sqrt{\color{blue}{\log \left(e^{\left(\log u1 \cdot -2\right) \cdot 0.027777777777777776}\right)}} + 0.5 \]

   2. associate-*l* 98.7%

      \[\leadsto \sqrt{\log \left(e^{\color{blue}{\log u1 \cdot \left(-2 \cdot 0.027777777777777776\right)}}\right)} + 0.5 \]

   3. exp-to-pow 98.7%

      \[\leadsto \sqrt{\log \color{blue}{\left({u1}^{\left(-2 \cdot 0.027777777777777776\right)}\right)}} + 0.5 \]

   4. metadata-eval 98.7%

      \[\leadsto \sqrt{\log \left({u1}^{\color{blue}{-0.05555555555555555}}\right)} + 0.5 \]

10. Applied egg-rr 98.7%

    \[\leadsto \sqrt{\color{blue}{\log \left({u1}^{-0.05555555555555555}\right)}} + 0.5 \]

11. Final simplification 98.7%

    \[\leadsto 0.5 + \sqrt{\log \left({u1}^{-0.05555555555555555}\right)} \]

Alternative 4: 98.4% accurate, 2.0× speedup

Math

\[\begin{array}{l} \\ 0.5 + \sqrt{\log u1 \cdot -0.05555555555555555} \end{array} \]

FPCore

(FPCore (u1 u2)
 :precision binary64
 (+ 0.5 (sqrt (* (log u1) -0.05555555555555555))))

C

double code(double u1, double u2) {
	return 0.5 + sqrt((log(u1) * -0.05555555555555555));
}

Fortran

real(8) function code(u1, u2)
    real(8), intent (in) :: u1
    real(8), intent (in) :: u2
    code = 0.5d0 + sqrt((log(u1) * (-0.05555555555555555d0)))
end function

Java

public static double code(double u1, double u2) {
	return 0.5 + Math.sqrt((Math.log(u1) * -0.05555555555555555));
}

Python

def code(u1, u2):
	return 0.5 + math.sqrt((math.log(u1) * -0.05555555555555555))

Julia

function code(u1, u2)
	return Float64(0.5 + sqrt(Float64(log(u1) * -0.05555555555555555)))
end

MATLAB

function tmp = code(u1, u2)
	tmp = 0.5 + sqrt((log(u1) * -0.05555555555555555));
end

Wolfram

code[u1_, u2_] := N[(0.5 + N[Sqrt[N[(N[Log[u1], $MachinePrecision] * -0.05555555555555555), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.5%

   \[\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]
2. Step-by-step derivation

   1. *-commutative 99.5%

      \[\leadsto \color{blue}{\left({\left(-2 \cdot \log u1\right)}^{0.5} \cdot \frac{1}{6}\right)} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5 \]

   2. associate-*l* 99.5%

      \[\leadsto \color{blue}{{\left(-2 \cdot \log u1\right)}^{0.5} \cdot \left(\frac{1}{6} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right)\right)} + 0.5 \]

   3. fma-def 99.5%

      \[\leadsto \color{blue}{\mathsf{fma}\left({\left(-2 \cdot \log u1\right)}^{0.5}, \frac{1}{6} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right), 0.5\right)} \]

   4. unpow1/2 99.5%

      \[\leadsto \mathsf{fma}\left(\color{blue}{\sqrt{-2 \cdot \log u1}}, \frac{1}{6} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right), 0.5\right) \]

   5. metadata-eval 99.5%

      \[\leadsto \mathsf{fma}\left(\sqrt{-2 \cdot \log u1}, \color{blue}{0.16666666666666666} \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right), 0.5\right) \]

   6. *-commutative 99.5%

      \[\leadsto \mathsf{fma}\left(\sqrt{-2 \cdot \log u1}, 0.16666666666666666 \cdot \cos \left(\color{blue}{\left(\pi \cdot 2\right)} \cdot u2\right), 0.5\right) \]

   7. associate-*l* 99.5%

      \[\leadsto \mathsf{fma}\left(\sqrt{-2 \cdot \log u1}, 0.16666666666666666 \cdot \cos \color{blue}{\left(\pi \cdot \left(2 \cdot u2\right)\right)}, 0.5\right) \]

3. Simplified 99.5%

   \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{-2 \cdot \log u1}, 0.16666666666666666 \cdot \cos \left(\pi \cdot \left(2 \cdot u2\right)\right), 0.5\right)} \]

4. Taylor expanded in u2 around 0 98.5%

   \[\leadsto \mathsf{fma}\left(\sqrt{-2 \cdot \log u1}, \color{blue}{0.16666666666666666}, 0.5\right) \]
5. Step-by-step derivation

   1. fma-udef 98.5%

      \[\leadsto \color{blue}{\sqrt{-2 \cdot \log u1} \cdot 0.16666666666666666 + 0.5} \]

   2. *-commutative 98.5%

      \[\leadsto \sqrt{\color{blue}{\log u1 \cdot -2}} \cdot 0.16666666666666666 + 0.5 \]

6. Applied egg-rr 98.5%

   \[\leadsto \color{blue}{\sqrt{\log u1 \cdot -2} \cdot 0.16666666666666666 + 0.5} \]
7. Step-by-step derivation

   1. add-sqr-sqrt 98.1%

      \[\leadsto \color{blue}{\sqrt{\sqrt{\log u1 \cdot -2} \cdot 0.16666666666666666} \cdot \sqrt{\sqrt{\log u1 \cdot -2} \cdot 0.16666666666666666}} + 0.5 \]

   2. sqrt-unprod 98.5%

      \[\leadsto \color{blue}{\sqrt{\left(\sqrt{\log u1 \cdot -2} \cdot 0.16666666666666666\right) \cdot \left(\sqrt{\log u1 \cdot -2} \cdot 0.16666666666666666\right)}} + 0.5 \]

   3. swap-sqr 98.5%

      \[\leadsto \sqrt{\color{blue}{\left(\sqrt{\log u1 \cdot -2} \cdot \sqrt{\log u1 \cdot -2}\right) \cdot \left(0.16666666666666666 \cdot 0.16666666666666666\right)}} + 0.5 \]

   4. add-sqr-sqrt 98.7%

      \[\leadsto \sqrt{\color{blue}{\left(\log u1 \cdot -2\right)} \cdot \left(0.16666666666666666 \cdot 0.16666666666666666\right)} + 0.5 \]

   5. metadata-eval 98.7%

      \[\leadsto \sqrt{\left(\log u1 \cdot -2\right) \cdot \color{blue}{0.027777777777777776}} + 0.5 \]

8. Applied egg-rr 98.7%

   \[\leadsto \color{blue}{\sqrt{\left(\log u1 \cdot -2\right) \cdot 0.027777777777777776}} + 0.5 \]

9. Taylor expanded in u1 around 0 98.7%

   \[\leadsto \sqrt{\color{blue}{-0.05555555555555555 \cdot \log u1}} + 0.5 \]
10. Step-by-step derivation

    1. *-commutative 98.7%

       \[\leadsto \sqrt{\color{blue}{\log u1 \cdot -0.05555555555555555}} + 0.5 \]

11. Simplified 98.7%

    \[\leadsto \sqrt{\color{blue}{\log u1 \cdot -0.05555555555555555}} + 0.5 \]

12. Final simplification 98.7%

    \[\leadsto 0.5 + \sqrt{\log u1 \cdot -0.05555555555555555} \]

Reproduce

herbie shell --seed 2023321 
(FPCore (u1 u2)
  :name "normal distribution"
  :precision binary64
  :pre (and (and (<= 0.0 u1) (<= u1 1.0)) (and (<= 0.0 u2) (<= u2 1.0)))
  (+ (* (* (/ 1.0 6.0) (pow (* -2.0 (log u1)) 0.5)) (cos (* (* 2.0 PI) u2))) 0.5))