Data.Approximate.Numerics:blog from approximate-0.2.2.1

Percentage Accurate: 99.7% → 99.9%

Time: 12.2s

Alternatives: 10

Speedup: 1.1×

Specification

Math

\[\begin{array}{l} \\ \frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \end{array} \]

FPCore

(FPCore (x)
 :precision binary64
 (/ (* 6.0 (- x 1.0)) (+ (+ x 1.0) (* 4.0 (sqrt x)))))

C

double code(double x) {
	return (6.0 * (x - 1.0)) / ((x + 1.0) + (4.0 * sqrt(x)));
}

Fortran

real(8) function code(x)
    real(8), intent (in) :: x
    code = (6.0d0 * (x - 1.0d0)) / ((x + 1.0d0) + (4.0d0 * sqrt(x)))
end function

Java

public static double code(double x) {
	return (6.0 * (x - 1.0)) / ((x + 1.0) + (4.0 * Math.sqrt(x)));
}

Python

def code(x):
	return (6.0 * (x - 1.0)) / ((x + 1.0) + (4.0 * math.sqrt(x)))

Julia

function code(x)
	return Float64(Float64(6.0 * Float64(x - 1.0)) / Float64(Float64(x + 1.0) + Float64(4.0 * sqrt(x))))
end

MATLAB

function tmp = code(x)
	tmp = (6.0 * (x - 1.0)) / ((x + 1.0) + (4.0 * sqrt(x)));
end

Wolfram

code[x_] := N[(N[(6.0 * N[(x - 1.0), $MachinePrecision]), $MachinePrecision] / N[(N[(x + 1.0), $MachinePrecision] + N[(4.0 * N[Sqrt[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Initial Program: 99.7% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \end{array} \]

FPCore

(FPCore (x)
 :precision binary64
 (/ (* 6.0 (- x 1.0)) (+ (+ x 1.0) (* 4.0 (sqrt x)))))

C

double code(double x) {
	return (6.0 * (x - 1.0)) / ((x + 1.0) + (4.0 * sqrt(x)));
}

Fortran

real(8) function code(x)
    real(8), intent (in) :: x
    code = (6.0d0 * (x - 1.0d0)) / ((x + 1.0d0) + (4.0d0 * sqrt(x)))
end function

Java

public static double code(double x) {
	return (6.0 * (x - 1.0)) / ((x + 1.0) + (4.0 * Math.sqrt(x)));
}

Python

def code(x):
	return (6.0 * (x - 1.0)) / ((x + 1.0) + (4.0 * math.sqrt(x)))

Julia

function code(x)
	return Float64(Float64(6.0 * Float64(x - 1.0)) / Float64(Float64(x + 1.0) + Float64(4.0 * sqrt(x))))
end

MATLAB

function tmp = code(x)
	tmp = (6.0 * (x - 1.0)) / ((x + 1.0) + (4.0 * sqrt(x)));
end

Wolfram

code[x_] := N[(N[(6.0 * N[(x - 1.0), $MachinePrecision]), $MachinePrecision] / N[(N[(x + 1.0), $MachinePrecision] + N[(4.0 * N[Sqrt[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Alternative 1: 99.9% accurate, 0.9× speedup

Math

\[\begin{array}{l} \\ \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + -1}} \end{array} \]

FPCore

(FPCore (x)
 :precision binary64
 (/ 6.0 (/ (+ x (fma 4.0 (sqrt x) 1.0)) (+ x -1.0))))

C

double code(double x) {
	return 6.0 / ((x + fma(4.0, sqrt(x), 1.0)) / (x + -1.0));
}

Julia

function code(x)
	return Float64(6.0 / Float64(Float64(x + fma(4.0, sqrt(x), 1.0)) / Float64(x + -1.0)))
end

Wolfram

code[x_] := N[(6.0 / N[(N[(x + N[(4.0 * N[Sqrt[x], $MachinePrecision] + 1.0), $MachinePrecision]), $MachinePrecision] / N[(x + -1.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.8%

   \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

   2. lift-*.f64 N/A

      \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]

   3. associate-/l* N/A

      \[\leadsto \color{blue}{6 \cdot \frac{x - 1}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

   4. clear-num N/A

      \[\leadsto 6 \cdot \color{blue}{\frac{1}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

   5. un-div-inv N/A

      \[\leadsto \color{blue}{\frac{6}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

   6. lower-/.f64 N/A

      \[\leadsto \color{blue}{\frac{6}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

   7. lower-/.f64 99.9

      \[\leadsto \frac{6}{\color{blue}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

   8. lift-+.f64 N/A

      \[\leadsto \frac{6}{\frac{\color{blue}{\left(x + 1\right) + 4 \cdot \sqrt{x}}}{x - 1}} \]

   9. lift-+.f64 N/A

      \[\leadsto \frac{6}{\frac{\color{blue}{\left(x + 1\right)} + 4 \cdot \sqrt{x}}{x - 1}} \]

   10. associate-+l+ N/A

       \[\leadsto \frac{6}{\frac{\color{blue}{x + \left(1 + 4 \cdot \sqrt{x}\right)}}{x - 1}} \]

   11. lower-+.f64 N/A

       \[\leadsto \frac{6}{\frac{\color{blue}{x + \left(1 + 4 \cdot \sqrt{x}\right)}}{x - 1}} \]

   12. +-commutative N/A

       \[\leadsto \frac{6}{\frac{x + \color{blue}{\left(4 \cdot \sqrt{x} + 1\right)}}{x - 1}} \]

   13. lift-*.f64 N/A

       \[\leadsto \frac{6}{\frac{x + \left(\color{blue}{4 \cdot \sqrt{x}} + 1\right)}{x - 1}} \]

   14. lower-fma.f64 99.9

       \[\leadsto \frac{6}{\frac{x + \color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}}{x - 1}} \]

   15. lift--.f64 N/A

       \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{\color{blue}{x - 1}}} \]

   16. sub-neg N/A

       \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{\color{blue}{x + \left(\mathsf{neg}\left(1\right)\right)}}} \]

   17. lower-+.f64 N/A

       \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{\color{blue}{x + \left(\mathsf{neg}\left(1\right)\right)}}} \]

   18. metadata-eval 99.9

       \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + \color{blue}{-1}}} \]

4. Applied rewrites 99.9%

   \[\leadsto \color{blue}{\frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + -1}}} \]
5. Add Preprocessing

Alternative 2: 97.5% accurate, 0.5× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{6 \cdot \left(x + -1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \leq -2:\\ \;\;\;\;\frac{\mathsf{fma}\left(x, 6, -6\right)}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}\\ \mathbf{else}:\\ \;\;\;\;\frac{6 \cdot x}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)}\\ \end{array} \end{array} \]

FPCore

(FPCore (x)
 :precision binary64
 (if (<= (/ (* 6.0 (+ x -1.0)) (+ (+ x 1.0) (* 4.0 (sqrt x)))) -2.0)
   (/ (fma x 6.0 -6.0) (fma 4.0 (sqrt x) 1.0))
   (/ (* 6.0 x) (+ 1.0 (fma 4.0 (sqrt x) x)))))

C

double code(double x) {
	double tmp;
	if (((6.0 * (x + -1.0)) / ((x + 1.0) + (4.0 * sqrt(x)))) <= -2.0) {
		tmp = fma(x, 6.0, -6.0) / fma(4.0, sqrt(x), 1.0);
	} else {
		tmp = (6.0 * x) / (1.0 + fma(4.0, sqrt(x), x));
	}
	return tmp;
}

Julia

function code(x)
	tmp = 0.0
	if (Float64(Float64(6.0 * Float64(x + -1.0)) / Float64(Float64(x + 1.0) + Float64(4.0 * sqrt(x)))) <= -2.0)
		tmp = Float64(fma(x, 6.0, -6.0) / fma(4.0, sqrt(x), 1.0));
	else
		tmp = Float64(Float64(6.0 * x) / Float64(1.0 + fma(4.0, sqrt(x), x)));
	end
	return tmp
end

Wolfram

code[x_] := If[LessEqual[N[(N[(6.0 * N[(x + -1.0), $MachinePrecision]), $MachinePrecision] / N[(N[(x + 1.0), $MachinePrecision] + N[(4.0 * N[Sqrt[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], -2.0], N[(N[(x * 6.0 + -6.0), $MachinePrecision] / N[(4.0 * N[Sqrt[x], $MachinePrecision] + 1.0), $MachinePrecision]), $MachinePrecision], N[(N[(6.0 * x), $MachinePrecision] / N[(1.0 + N[(4.0 * N[Sqrt[x], $MachinePrecision] + x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if (/.f64 (*.f64 #s(literal 6 binary64) (-.f64 x #s(literal 1 binary64))) (+.f64 (+.f64 x #s(literal 1 binary64)) (*.f64 #s(literal 4 binary64) (sqrt.f64 x)))) < -2

   1. Initial program 99.9%

      \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

      \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{1 + 4 \cdot \sqrt{x}}} \]
   4. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{4 \cdot \sqrt{x} + 1}} \]

      2. lower-fma.f64 N/A

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]

      3. lower-sqrt.f64 97.9

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\mathsf{fma}\left(4, \color{blue}{\sqrt{x}}, 1\right)} \]

   5. Applied rewrites 97.9%

      \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]
   6. Step-by-step derivation

      1. lift-*.f64 N/A

         \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      2. lift--.f64 N/A

         \[\leadsto \frac{6 \cdot \color{blue}{\left(x - 1\right)}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      3. sub-neg N/A

         \[\leadsto \frac{6 \cdot \color{blue}{\left(x + \left(\mathsf{neg}\left(1\right)\right)\right)}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      4. metadata-eval N/A

         \[\leadsto \frac{6 \cdot \left(x + \color{blue}{-1}\right)}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      5. distribute-rgt-in N/A

         \[\leadsto \frac{\color{blue}{x \cdot 6 + -1 \cdot 6}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      6. metadata-eval N/A

         \[\leadsto \frac{x \cdot 6 + \color{blue}{-6}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      7. lower-fma.f64 97.9

         \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(x, 6, -6\right)}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   7. Applied rewrites 97.9%

      \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(x, 6, -6\right)}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   if -2 < (/.f64 (*.f64 #s(literal 6 binary64) (-.f64 x #s(literal 1 binary64))) (+.f64 (+.f64 x #s(literal 1 binary64)) (*.f64 #s(literal 4 binary64) (sqrt.f64 x))))

   1. Initial program 99.7%

      \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      2. lift-*.f64 N/A

         \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]

      3. associate-/l* N/A

         \[\leadsto \color{blue}{6 \cdot \frac{x - 1}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      4. clear-num N/A

         \[\leadsto 6 \cdot \color{blue}{\frac{1}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

      5. un-div-inv N/A

         \[\leadsto \color{blue}{\frac{6}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

      6. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{6}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

      7. lower-/.f64 99.9

         \[\leadsto \frac{6}{\color{blue}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

      8. lift-+.f64 N/A

         \[\leadsto \frac{6}{\frac{\color{blue}{\left(x + 1\right) + 4 \cdot \sqrt{x}}}{x - 1}} \]

      9. lift-+.f64 N/A

         \[\leadsto \frac{6}{\frac{\color{blue}{\left(x + 1\right)} + 4 \cdot \sqrt{x}}{x - 1}} \]

      10. associate-+l+ N/A

          \[\leadsto \frac{6}{\frac{\color{blue}{x + \left(1 + 4 \cdot \sqrt{x}\right)}}{x - 1}} \]

      11. lower-+.f64 N/A

          \[\leadsto \frac{6}{\frac{\color{blue}{x + \left(1 + 4 \cdot \sqrt{x}\right)}}{x - 1}} \]

      12. +-commutative N/A

          \[\leadsto \frac{6}{\frac{x + \color{blue}{\left(4 \cdot \sqrt{x} + 1\right)}}{x - 1}} \]

      13. lift-*.f64 N/A

          \[\leadsto \frac{6}{\frac{x + \left(\color{blue}{4 \cdot \sqrt{x}} + 1\right)}{x - 1}} \]

      14. lower-fma.f64 99.9

          \[\leadsto \frac{6}{\frac{x + \color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}}{x - 1}} \]

      15. lift--.f64 N/A

          \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{\color{blue}{x - 1}}} \]

      16. sub-neg N/A

          \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{\color{blue}{x + \left(\mathsf{neg}\left(1\right)\right)}}} \]

      17. lower-+.f64 N/A

          \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{\color{blue}{x + \left(\mathsf{neg}\left(1\right)\right)}}} \]

      18. metadata-eval 99.9

          \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + \color{blue}{-1}}} \]

   4. Applied rewrites 99.9%

      \[\leadsto \color{blue}{\frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + -1}}} \]
   5. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + -1}}} \]

      2. lift-/.f64 N/A

         \[\leadsto \frac{6}{\color{blue}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + -1}}} \]

      3. associate-/r/ N/A

         \[\leadsto \color{blue}{\frac{6}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \cdot \left(x + -1\right)} \]

      4. associate-*l/ N/A

         \[\leadsto \color{blue}{\frac{6 \cdot \left(x + -1\right)}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]

      5. lift-+.f64 N/A

         \[\leadsto \frac{6 \cdot \color{blue}{\left(x + -1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      6. metadata-eval N/A

         \[\leadsto \frac{6 \cdot \left(x + \color{blue}{\left(\mathsf{neg}\left(1\right)\right)}\right)}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      7. sub-neg N/A

         \[\leadsto \frac{6 \cdot \color{blue}{\left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      8. lift--.f64 N/A

         \[\leadsto \frac{6 \cdot \color{blue}{\left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      9. lift-*.f64 N/A

         \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      10. lower-/.f64 99.7

          \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]

      11. lift-*.f64 N/A

          \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      12. lift--.f64 N/A

          \[\leadsto \frac{6 \cdot \color{blue}{\left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      13. sub-neg N/A

          \[\leadsto \frac{6 \cdot \color{blue}{\left(x + \left(\mathsf{neg}\left(1\right)\right)\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      14. metadata-eval N/A

          \[\leadsto \frac{6 \cdot \left(x + \color{blue}{-1}\right)}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      15. distribute-lft-in N/A

          \[\leadsto \frac{\color{blue}{6 \cdot x + 6 \cdot -1}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      16. metadata-eval N/A

          \[\leadsto \frac{6 \cdot x + \color{blue}{-6}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      17. lift-fma.f64 99.8

          \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(6, x, -6\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      18. lift-+.f64 N/A

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{\color{blue}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]

      19. lift-fma.f64 N/A

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{x + \color{blue}{\left(4 \cdot \sqrt{x} + 1\right)}} \]

      20. associate-+r+ N/A

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{\color{blue}{\left(x + 4 \cdot \sqrt{x}\right) + 1}} \]

      21. +-commutative N/A

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{\color{blue}{1 + \left(x + 4 \cdot \sqrt{x}\right)}} \]

      22. lower-+.f64 N/A

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{\color{blue}{1 + \left(x + 4 \cdot \sqrt{x}\right)}} \]

      23. +-commutative N/A

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{1 + \color{blue}{\left(4 \cdot \sqrt{x} + x\right)}} \]

      24. lower-fma.f64 99.8

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{1 + \color{blue}{\mathsf{fma}\left(4, \sqrt{x}, x\right)}} \]

   6. Applied rewrites 99.8%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(6, x, -6\right)}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)}} \]

   7. Taylor expanded in x around inf

      \[\leadsto \frac{\color{blue}{6 \cdot x}}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)} \]
   8. Step-by-step derivation

      1. *-commutative N/A

         \[\leadsto \frac{\color{blue}{x \cdot 6}}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)} \]

      2. lower-*.f64 97.2

         \[\leadsto \frac{\color{blue}{x \cdot 6}}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)} \]

   9. Applied rewrites 97.2%

      \[\leadsto \frac{\color{blue}{x \cdot 6}}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)} \]
3. Recombined 2 regimes into one program.

4. Final simplification 97.6%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{6 \cdot \left(x + -1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \leq -2:\\ \;\;\;\;\frac{\mathsf{fma}\left(x, 6, -6\right)}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}\\ \mathbf{else}:\\ \;\;\;\;\frac{6 \cdot x}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)}\\ \end{array} \]
5. Add Preprocessing

Alternative 3: 97.5% accurate, 0.5× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{6 \cdot \left(x + -1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \leq -2:\\ \;\;\;\;\frac{\mathsf{fma}\left(x, 6, -6\right)}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(\sqrt{\frac{1}{x}}, -24, 6\right)\\ \end{array} \end{array} \]

FPCore

(FPCore (x)
 :precision binary64
 (if (<= (/ (* 6.0 (+ x -1.0)) (+ (+ x 1.0) (* 4.0 (sqrt x)))) -2.0)
   (/ (fma x 6.0 -6.0) (fma 4.0 (sqrt x) 1.0))
   (fma (sqrt (/ 1.0 x)) -24.0 6.0)))

C

double code(double x) {
	double tmp;
	if (((6.0 * (x + -1.0)) / ((x + 1.0) + (4.0 * sqrt(x)))) <= -2.0) {
		tmp = fma(x, 6.0, -6.0) / fma(4.0, sqrt(x), 1.0);
	} else {
		tmp = fma(sqrt((1.0 / x)), -24.0, 6.0);
	}
	return tmp;
}

Julia

function code(x)
	tmp = 0.0
	if (Float64(Float64(6.0 * Float64(x + -1.0)) / Float64(Float64(x + 1.0) + Float64(4.0 * sqrt(x)))) <= -2.0)
		tmp = Float64(fma(x, 6.0, -6.0) / fma(4.0, sqrt(x), 1.0));
	else
		tmp = fma(sqrt(Float64(1.0 / x)), -24.0, 6.0);
	end
	return tmp
end

Wolfram

code[x_] := If[LessEqual[N[(N[(6.0 * N[(x + -1.0), $MachinePrecision]), $MachinePrecision] / N[(N[(x + 1.0), $MachinePrecision] + N[(4.0 * N[Sqrt[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], -2.0], N[(N[(x * 6.0 + -6.0), $MachinePrecision] / N[(4.0 * N[Sqrt[x], $MachinePrecision] + 1.0), $MachinePrecision]), $MachinePrecision], N[(N[Sqrt[N[(1.0 / x), $MachinePrecision]], $MachinePrecision] * -24.0 + 6.0), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if (/.f64 (*.f64 #s(literal 6 binary64) (-.f64 x #s(literal 1 binary64))) (+.f64 (+.f64 x #s(literal 1 binary64)) (*.f64 #s(literal 4 binary64) (sqrt.f64 x)))) < -2

   1. Initial program 99.9%

      \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

      \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{1 + 4 \cdot \sqrt{x}}} \]
   4. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{4 \cdot \sqrt{x} + 1}} \]

      2. lower-fma.f64 N/A

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]

      3. lower-sqrt.f64 97.9

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\mathsf{fma}\left(4, \color{blue}{\sqrt{x}}, 1\right)} \]

   5. Applied rewrites 97.9%

      \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]
   6. Step-by-step derivation

      1. lift-*.f64 N/A

         \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      2. lift--.f64 N/A

         \[\leadsto \frac{6 \cdot \color{blue}{\left(x - 1\right)}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      3. sub-neg N/A

         \[\leadsto \frac{6 \cdot \color{blue}{\left(x + \left(\mathsf{neg}\left(1\right)\right)\right)}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      4. metadata-eval N/A

         \[\leadsto \frac{6 \cdot \left(x + \color{blue}{-1}\right)}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      5. distribute-rgt-in N/A

         \[\leadsto \frac{\color{blue}{x \cdot 6 + -1 \cdot 6}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      6. metadata-eval N/A

         \[\leadsto \frac{x \cdot 6 + \color{blue}{-6}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      7. lower-fma.f64 97.9

         \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(x, 6, -6\right)}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   7. Applied rewrites 97.9%

      \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(x, 6, -6\right)}}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   if -2 < (/.f64 (*.f64 #s(literal 6 binary64) (-.f64 x #s(literal 1 binary64))) (+.f64 (+.f64 x #s(literal 1 binary64)) (*.f64 #s(literal 4 binary64) (sqrt.f64 x))))

   1. Initial program 99.7%

      \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      2. lift-+.f64 N/A

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      3. flip-+ N/A

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\frac{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}{\left(x + 1\right) - 4 \cdot \sqrt{x}}}} \]

      4. associate-/r/ N/A

         \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)} \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)} \]

      5. associate-*l/ N/A

         \[\leadsto \color{blue}{\frac{\left(6 \cdot \left(x - 1\right)\right) \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}} \]

      6. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{\left(6 \cdot \left(x - 1\right)\right) \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}} \]

   4. Applied rewrites 50.8%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(6, x, -6\right) \cdot \left(\left(x + 1\right) + \sqrt{x} \cdot -4\right)}{\mathsf{fma}\left(x + 1, x + 1, x \cdot -16\right)}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \color{blue}{6 \cdot \left(1 + -4 \cdot \sqrt{\frac{1}{x}}\right)} \]
   6. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto 6 \cdot \color{blue}{\left(-4 \cdot \sqrt{\frac{1}{x}} + 1\right)} \]

      2. distribute-rgt-in N/A

         \[\leadsto \color{blue}{\left(-4 \cdot \sqrt{\frac{1}{x}}\right) \cdot 6 + 1 \cdot 6} \]

      3. metadata-eval N/A

         \[\leadsto \left(-4 \cdot \sqrt{\frac{1}{x}}\right) \cdot 6 + \color{blue}{6} \]

      4. *-commutative N/A

         \[\leadsto \color{blue}{\left(\sqrt{\frac{1}{x}} \cdot -4\right)} \cdot 6 + 6 \]

      5. associate-*l* N/A

         \[\leadsto \color{blue}{\sqrt{\frac{1}{x}} \cdot \left(-4 \cdot 6\right)} + 6 \]

      6. metadata-eval N/A

         \[\leadsto \sqrt{\frac{1}{x}} \cdot \color{blue}{-24} + 6 \]

      7. metadata-eval N/A

         \[\leadsto \sqrt{\frac{1}{x}} \cdot \color{blue}{\left(6 \cdot -4\right)} + 6 \]

      8. lower-fma.f64 N/A

         \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{\frac{1}{x}}, 6 \cdot -4, 6\right)} \]

      9. lower-sqrt.f64 N/A

         \[\leadsto \mathsf{fma}\left(\color{blue}{\sqrt{\frac{1}{x}}}, 6 \cdot -4, 6\right) \]

      10. lower-/.f64 N/A

          \[\leadsto \mathsf{fma}\left(\sqrt{\color{blue}{\frac{1}{x}}}, 6 \cdot -4, 6\right) \]

      11. metadata-eval 97.1

          \[\leadsto \mathsf{fma}\left(\sqrt{\frac{1}{x}}, \color{blue}{-24}, 6\right) \]

   7. Applied rewrites 97.1%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{\frac{1}{x}}, -24, 6\right)} \]
3. Recombined 2 regimes into one program.

4. Final simplification 97.5%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{6 \cdot \left(x + -1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \leq -2:\\ \;\;\;\;\frac{\mathsf{fma}\left(x, 6, -6\right)}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(\sqrt{\frac{1}{x}}, -24, 6\right)\\ \end{array} \]
5. Add Preprocessing

Alternative 4: 97.5% accurate, 0.5× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{6 \cdot \left(x + -1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \leq -2:\\ \;\;\;\;\frac{-6}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)}\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(\sqrt{\frac{1}{x}}, -24, 6\right)\\ \end{array} \end{array} \]

FPCore

(FPCore (x)
 :precision binary64
 (if (<= (/ (* 6.0 (+ x -1.0)) (+ (+ x 1.0) (* 4.0 (sqrt x)))) -2.0)
   (/ -6.0 (+ 1.0 (fma 4.0 (sqrt x) x)))
   (fma (sqrt (/ 1.0 x)) -24.0 6.0)))

C

double code(double x) {
	double tmp;
	if (((6.0 * (x + -1.0)) / ((x + 1.0) + (4.0 * sqrt(x)))) <= -2.0) {
		tmp = -6.0 / (1.0 + fma(4.0, sqrt(x), x));
	} else {
		tmp = fma(sqrt((1.0 / x)), -24.0, 6.0);
	}
	return tmp;
}

Julia

function code(x)
	tmp = 0.0
	if (Float64(Float64(6.0 * Float64(x + -1.0)) / Float64(Float64(x + 1.0) + Float64(4.0 * sqrt(x)))) <= -2.0)
		tmp = Float64(-6.0 / Float64(1.0 + fma(4.0, sqrt(x), x)));
	else
		tmp = fma(sqrt(Float64(1.0 / x)), -24.0, 6.0);
	end
	return tmp
end

Wolfram

code[x_] := If[LessEqual[N[(N[(6.0 * N[(x + -1.0), $MachinePrecision]), $MachinePrecision] / N[(N[(x + 1.0), $MachinePrecision] + N[(4.0 * N[Sqrt[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], -2.0], N[(-6.0 / N[(1.0 + N[(4.0 * N[Sqrt[x], $MachinePrecision] + x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], N[(N[Sqrt[N[(1.0 / x), $MachinePrecision]], $MachinePrecision] * -24.0 + 6.0), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if (/.f64 (*.f64 #s(literal 6 binary64) (-.f64 x #s(literal 1 binary64))) (+.f64 (+.f64 x #s(literal 1 binary64)) (*.f64 #s(literal 4 binary64) (sqrt.f64 x)))) < -2

   1. Initial program 99.9%

      \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      2. lift-*.f64 N/A

         \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]

      3. associate-/l* N/A

         \[\leadsto \color{blue}{6 \cdot \frac{x - 1}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      4. clear-num N/A

         \[\leadsto 6 \cdot \color{blue}{\frac{1}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

      5. un-div-inv N/A

         \[\leadsto \color{blue}{\frac{6}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

      6. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{6}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

      7. lower-/.f64 99.9

         \[\leadsto \frac{6}{\color{blue}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

      8. lift-+.f64 N/A

         \[\leadsto \frac{6}{\frac{\color{blue}{\left(x + 1\right) + 4 \cdot \sqrt{x}}}{x - 1}} \]

      9. lift-+.f64 N/A

         \[\leadsto \frac{6}{\frac{\color{blue}{\left(x + 1\right)} + 4 \cdot \sqrt{x}}{x - 1}} \]

      10. associate-+l+ N/A

          \[\leadsto \frac{6}{\frac{\color{blue}{x + \left(1 + 4 \cdot \sqrt{x}\right)}}{x - 1}} \]

      11. lower-+.f64 N/A

          \[\leadsto \frac{6}{\frac{\color{blue}{x + \left(1 + 4 \cdot \sqrt{x}\right)}}{x - 1}} \]

      12. +-commutative N/A

          \[\leadsto \frac{6}{\frac{x + \color{blue}{\left(4 \cdot \sqrt{x} + 1\right)}}{x - 1}} \]

      13. lift-*.f64 N/A

          \[\leadsto \frac{6}{\frac{x + \left(\color{blue}{4 \cdot \sqrt{x}} + 1\right)}{x - 1}} \]

      14. lower-fma.f64 99.9

          \[\leadsto \frac{6}{\frac{x + \color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}}{x - 1}} \]

      15. lift--.f64 N/A

          \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{\color{blue}{x - 1}}} \]

      16. sub-neg N/A

          \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{\color{blue}{x + \left(\mathsf{neg}\left(1\right)\right)}}} \]

      17. lower-+.f64 N/A

          \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{\color{blue}{x + \left(\mathsf{neg}\left(1\right)\right)}}} \]

      18. metadata-eval 99.9

          \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + \color{blue}{-1}}} \]

   4. Applied rewrites 99.9%

      \[\leadsto \color{blue}{\frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + -1}}} \]
   5. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + -1}}} \]

      2. lift-/.f64 N/A

         \[\leadsto \frac{6}{\color{blue}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + -1}}} \]

      3. associate-/r/ N/A

         \[\leadsto \color{blue}{\frac{6}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \cdot \left(x + -1\right)} \]

      4. associate-*l/ N/A

         \[\leadsto \color{blue}{\frac{6 \cdot \left(x + -1\right)}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]

      5. lift-+.f64 N/A

         \[\leadsto \frac{6 \cdot \color{blue}{\left(x + -1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      6. metadata-eval N/A

         \[\leadsto \frac{6 \cdot \left(x + \color{blue}{\left(\mathsf{neg}\left(1\right)\right)}\right)}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      7. sub-neg N/A

         \[\leadsto \frac{6 \cdot \color{blue}{\left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      8. lift--.f64 N/A

         \[\leadsto \frac{6 \cdot \color{blue}{\left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      9. lift-*.f64 N/A

         \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      10. lower-/.f64 99.9

          \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]

      11. lift-*.f64 N/A

          \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      12. lift--.f64 N/A

          \[\leadsto \frac{6 \cdot \color{blue}{\left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      13. sub-neg N/A

          \[\leadsto \frac{6 \cdot \color{blue}{\left(x + \left(\mathsf{neg}\left(1\right)\right)\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      14. metadata-eval N/A

          \[\leadsto \frac{6 \cdot \left(x + \color{blue}{-1}\right)}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      15. distribute-lft-in N/A

          \[\leadsto \frac{\color{blue}{6 \cdot x + 6 \cdot -1}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      16. metadata-eval N/A

          \[\leadsto \frac{6 \cdot x + \color{blue}{-6}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      17. lift-fma.f64 99.9

          \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(6, x, -6\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

      18. lift-+.f64 N/A

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{\color{blue}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]

      19. lift-fma.f64 N/A

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{x + \color{blue}{\left(4 \cdot \sqrt{x} + 1\right)}} \]

      20. associate-+r+ N/A

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{\color{blue}{\left(x + 4 \cdot \sqrt{x}\right) + 1}} \]

      21. +-commutative N/A

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{\color{blue}{1 + \left(x + 4 \cdot \sqrt{x}\right)}} \]

      22. lower-+.f64 N/A

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{\color{blue}{1 + \left(x + 4 \cdot \sqrt{x}\right)}} \]

      23. +-commutative N/A

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{1 + \color{blue}{\left(4 \cdot \sqrt{x} + x\right)}} \]

      24. lower-fma.f64 99.9

          \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{1 + \color{blue}{\mathsf{fma}\left(4, \sqrt{x}, x\right)}} \]

   6. Applied rewrites 99.9%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(6, x, -6\right)}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)}} \]

   7. Taylor expanded in x around 0

      \[\leadsto \frac{\color{blue}{-6}}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)} \]
   8. Step-by-step derivation

   9. Applied rewrites 97.9%

      \[\leadsto \frac{\color{blue}{-6}}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)} \]

   if -2 < (/.f64 (*.f64 #s(literal 6 binary64) (-.f64 x #s(literal 1 binary64))) (+.f64 (+.f64 x #s(literal 1 binary64)) (*.f64 #s(literal 4 binary64) (sqrt.f64 x))))

   1. Initial program 99.7%

      \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      2. lift-+.f64 N/A

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      3. flip-+ N/A

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\frac{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}{\left(x + 1\right) - 4 \cdot \sqrt{x}}}} \]

      4. associate-/r/ N/A

         \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)} \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)} \]

      5. associate-*l/ N/A

         \[\leadsto \color{blue}{\frac{\left(6 \cdot \left(x - 1\right)\right) \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}} \]

      6. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{\left(6 \cdot \left(x - 1\right)\right) \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}} \]

   4. Applied rewrites 50.8%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(6, x, -6\right) \cdot \left(\left(x + 1\right) + \sqrt{x} \cdot -4\right)}{\mathsf{fma}\left(x + 1, x + 1, x \cdot -16\right)}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \color{blue}{6 \cdot \left(1 + -4 \cdot \sqrt{\frac{1}{x}}\right)} \]
   6. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto 6 \cdot \color{blue}{\left(-4 \cdot \sqrt{\frac{1}{x}} + 1\right)} \]

      2. distribute-rgt-in N/A

         \[\leadsto \color{blue}{\left(-4 \cdot \sqrt{\frac{1}{x}}\right) \cdot 6 + 1 \cdot 6} \]

      3. metadata-eval N/A

         \[\leadsto \left(-4 \cdot \sqrt{\frac{1}{x}}\right) \cdot 6 + \color{blue}{6} \]

      4. *-commutative N/A

         \[\leadsto \color{blue}{\left(\sqrt{\frac{1}{x}} \cdot -4\right)} \cdot 6 + 6 \]

      5. associate-*l* N/A

         \[\leadsto \color{blue}{\sqrt{\frac{1}{x}} \cdot \left(-4 \cdot 6\right)} + 6 \]

      6. metadata-eval N/A

         \[\leadsto \sqrt{\frac{1}{x}} \cdot \color{blue}{-24} + 6 \]

      7. metadata-eval N/A

         \[\leadsto \sqrt{\frac{1}{x}} \cdot \color{blue}{\left(6 \cdot -4\right)} + 6 \]

      8. lower-fma.f64 N/A

         \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{\frac{1}{x}}, 6 \cdot -4, 6\right)} \]

      9. lower-sqrt.f64 N/A

         \[\leadsto \mathsf{fma}\left(\color{blue}{\sqrt{\frac{1}{x}}}, 6 \cdot -4, 6\right) \]

      10. lower-/.f64 N/A

          \[\leadsto \mathsf{fma}\left(\sqrt{\color{blue}{\frac{1}{x}}}, 6 \cdot -4, 6\right) \]

      11. metadata-eval 97.1

          \[\leadsto \mathsf{fma}\left(\sqrt{\frac{1}{x}}, \color{blue}{-24}, 6\right) \]

   7. Applied rewrites 97.1%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{\frac{1}{x}}, -24, 6\right)} \]
3. Recombined 2 regimes into one program.

4. Final simplification 97.5%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{6 \cdot \left(x + -1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \leq -2:\\ \;\;\;\;\frac{-6}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)}\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(\sqrt{\frac{1}{x}}, -24, 6\right)\\ \end{array} \]
5. Add Preprocessing

Alternative 5: 97.5% accurate, 0.5× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{6 \cdot \left(x + -1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \leq -2:\\ \;\;\;\;\frac{-6}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(\sqrt{\frac{1}{x}}, -24, 6\right)\\ \end{array} \end{array} \]

FPCore

(FPCore (x)
 :precision binary64
 (if (<= (/ (* 6.0 (+ x -1.0)) (+ (+ x 1.0) (* 4.0 (sqrt x)))) -2.0)
   (/ -6.0 (+ x (fma 4.0 (sqrt x) 1.0)))
   (fma (sqrt (/ 1.0 x)) -24.0 6.0)))

C

double code(double x) {
	double tmp;
	if (((6.0 * (x + -1.0)) / ((x + 1.0) + (4.0 * sqrt(x)))) <= -2.0) {
		tmp = -6.0 / (x + fma(4.0, sqrt(x), 1.0));
	} else {
		tmp = fma(sqrt((1.0 / x)), -24.0, 6.0);
	}
	return tmp;
}

Julia

function code(x)
	tmp = 0.0
	if (Float64(Float64(6.0 * Float64(x + -1.0)) / Float64(Float64(x + 1.0) + Float64(4.0 * sqrt(x)))) <= -2.0)
		tmp = Float64(-6.0 / Float64(x + fma(4.0, sqrt(x), 1.0)));
	else
		tmp = fma(sqrt(Float64(1.0 / x)), -24.0, 6.0);
	end
	return tmp
end

Wolfram

code[x_] := If[LessEqual[N[(N[(6.0 * N[(x + -1.0), $MachinePrecision]), $MachinePrecision] / N[(N[(x + 1.0), $MachinePrecision] + N[(4.0 * N[Sqrt[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], -2.0], N[(-6.0 / N[(x + N[(4.0 * N[Sqrt[x], $MachinePrecision] + 1.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], N[(N[Sqrt[N[(1.0 / x), $MachinePrecision]], $MachinePrecision] * -24.0 + 6.0), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if (/.f64 (*.f64 #s(literal 6 binary64) (-.f64 x #s(literal 1 binary64))) (+.f64 (+.f64 x #s(literal 1 binary64)) (*.f64 #s(literal 4 binary64) (sqrt.f64 x)))) < -2

   1. Initial program 99.9%

      \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

      \[\leadsto \frac{\color{blue}{-6}}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
   4. Step-by-step derivation

   5. Applied rewrites 97.9%

      \[\leadsto \frac{\color{blue}{-6}}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
   6. Step-by-step derivation

      1. lift-+.f64 N/A

         \[\leadsto \frac{-6}{\color{blue}{\left(x + 1\right)} + 4 \cdot \sqrt{x}} \]

      2. lift-+.f64 N/A

         \[\leadsto \frac{-6}{\color{blue}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      3. associate-+l+ N/A

         \[\leadsto \frac{-6}{\color{blue}{x + \left(1 + 4 \cdot \sqrt{x}\right)}} \]

      4. +-commutative N/A

         \[\leadsto \frac{-6}{x + \color{blue}{\left(4 \cdot \sqrt{x} + 1\right)}} \]

      5. lift-*.f64 N/A

         \[\leadsto \frac{-6}{x + \left(\color{blue}{4 \cdot \sqrt{x}} + 1\right)} \]

      6. lift-fma.f64 N/A

         \[\leadsto \frac{-6}{x + \color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]

      7. +-commutative N/A

         \[\leadsto \frac{-6}{\color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right) + x}} \]

      8. lower-+.f64 97.9

         \[\leadsto \frac{-6}{\color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right) + x}} \]

   7. Applied rewrites 97.9%

      \[\leadsto \frac{-6}{\color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right) + x}} \]

   if -2 < (/.f64 (*.f64 #s(literal 6 binary64) (-.f64 x #s(literal 1 binary64))) (+.f64 (+.f64 x #s(literal 1 binary64)) (*.f64 #s(literal 4 binary64) (sqrt.f64 x))))

   1. Initial program 99.7%

      \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      2. lift-+.f64 N/A

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      3. flip-+ N/A

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\frac{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}{\left(x + 1\right) - 4 \cdot \sqrt{x}}}} \]

      4. associate-/r/ N/A

         \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)} \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)} \]

      5. associate-*l/ N/A

         \[\leadsto \color{blue}{\frac{\left(6 \cdot \left(x - 1\right)\right) \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}} \]

      6. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{\left(6 \cdot \left(x - 1\right)\right) \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}} \]

   4. Applied rewrites 50.8%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(6, x, -6\right) \cdot \left(\left(x + 1\right) + \sqrt{x} \cdot -4\right)}{\mathsf{fma}\left(x + 1, x + 1, x \cdot -16\right)}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \color{blue}{6 \cdot \left(1 + -4 \cdot \sqrt{\frac{1}{x}}\right)} \]
   6. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto 6 \cdot \color{blue}{\left(-4 \cdot \sqrt{\frac{1}{x}} + 1\right)} \]

      2. distribute-rgt-in N/A

         \[\leadsto \color{blue}{\left(-4 \cdot \sqrt{\frac{1}{x}}\right) \cdot 6 + 1 \cdot 6} \]

      3. metadata-eval N/A

         \[\leadsto \left(-4 \cdot \sqrt{\frac{1}{x}}\right) \cdot 6 + \color{blue}{6} \]

      4. *-commutative N/A

         \[\leadsto \color{blue}{\left(\sqrt{\frac{1}{x}} \cdot -4\right)} \cdot 6 + 6 \]

      5. associate-*l* N/A

         \[\leadsto \color{blue}{\sqrt{\frac{1}{x}} \cdot \left(-4 \cdot 6\right)} + 6 \]

      6. metadata-eval N/A

         \[\leadsto \sqrt{\frac{1}{x}} \cdot \color{blue}{-24} + 6 \]

      7. metadata-eval N/A

         \[\leadsto \sqrt{\frac{1}{x}} \cdot \color{blue}{\left(6 \cdot -4\right)} + 6 \]

      8. lower-fma.f64 N/A

         \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{\frac{1}{x}}, 6 \cdot -4, 6\right)} \]

      9. lower-sqrt.f64 N/A

         \[\leadsto \mathsf{fma}\left(\color{blue}{\sqrt{\frac{1}{x}}}, 6 \cdot -4, 6\right) \]

      10. lower-/.f64 N/A

          \[\leadsto \mathsf{fma}\left(\sqrt{\color{blue}{\frac{1}{x}}}, 6 \cdot -4, 6\right) \]

      11. metadata-eval 97.1

          \[\leadsto \mathsf{fma}\left(\sqrt{\frac{1}{x}}, \color{blue}{-24}, 6\right) \]

   7. Applied rewrites 97.1%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{\frac{1}{x}}, -24, 6\right)} \]
3. Recombined 2 regimes into one program.

4. Final simplification 97.5%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{6 \cdot \left(x + -1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \leq -2:\\ \;\;\;\;\frac{-6}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(\sqrt{\frac{1}{x}}, -24, 6\right)\\ \end{array} \]
5. Add Preprocessing

Alternative 6: 97.5% accurate, 0.6× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{6 \cdot \left(x + -1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \leq -2:\\ \;\;\;\;\frac{6}{\mathsf{fma}\left(\sqrt{x}, -4, -1\right)}\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(\sqrt{\frac{1}{x}}, -24, 6\right)\\ \end{array} \end{array} \]

FPCore

(FPCore (x)
 :precision binary64
 (if (<= (/ (* 6.0 (+ x -1.0)) (+ (+ x 1.0) (* 4.0 (sqrt x)))) -2.0)
   (/ 6.0 (fma (sqrt x) -4.0 -1.0))
   (fma (sqrt (/ 1.0 x)) -24.0 6.0)))

C

double code(double x) {
	double tmp;
	if (((6.0 * (x + -1.0)) / ((x + 1.0) + (4.0 * sqrt(x)))) <= -2.0) {
		tmp = 6.0 / fma(sqrt(x), -4.0, -1.0);
	} else {
		tmp = fma(sqrt((1.0 / x)), -24.0, 6.0);
	}
	return tmp;
}

Julia

function code(x)
	tmp = 0.0
	if (Float64(Float64(6.0 * Float64(x + -1.0)) / Float64(Float64(x + 1.0) + Float64(4.0 * sqrt(x)))) <= -2.0)
		tmp = Float64(6.0 / fma(sqrt(x), -4.0, -1.0));
	else
		tmp = fma(sqrt(Float64(1.0 / x)), -24.0, 6.0);
	end
	return tmp
end

Wolfram

code[x_] := If[LessEqual[N[(N[(6.0 * N[(x + -1.0), $MachinePrecision]), $MachinePrecision] / N[(N[(x + 1.0), $MachinePrecision] + N[(4.0 * N[Sqrt[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], -2.0], N[(6.0 / N[(N[Sqrt[x], $MachinePrecision] * -4.0 + -1.0), $MachinePrecision]), $MachinePrecision], N[(N[Sqrt[N[(1.0 / x), $MachinePrecision]], $MachinePrecision] * -24.0 + 6.0), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if (/.f64 (*.f64 #s(literal 6 binary64) (-.f64 x #s(literal 1 binary64))) (+.f64 (+.f64 x #s(literal 1 binary64)) (*.f64 #s(literal 4 binary64) (sqrt.f64 x)))) < -2

   1. Initial program 99.9%

      \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

      \[\leadsto \color{blue}{\frac{-6}{1 + 4 \cdot \sqrt{x}}} \]
   4. Step-by-step derivation

      1. metadata-eval N/A

         \[\leadsto \frac{\color{blue}{\mathsf{neg}\left(6\right)}}{1 + 4 \cdot \sqrt{x}} \]

      2. distribute-neg-frac N/A

         \[\leadsto \color{blue}{\mathsf{neg}\left(\frac{6}{1 + 4 \cdot \sqrt{x}}\right)} \]

      3. distribute-neg-frac2 N/A

         \[\leadsto \color{blue}{\frac{6}{\mathsf{neg}\left(\left(1 + 4 \cdot \sqrt{x}\right)\right)}} \]

      4. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{6}{\mathsf{neg}\left(\left(1 + 4 \cdot \sqrt{x}\right)\right)}} \]

      5. +-commutative N/A

         \[\leadsto \frac{6}{\mathsf{neg}\left(\color{blue}{\left(4 \cdot \sqrt{x} + 1\right)}\right)} \]

      6. distribute-neg-in N/A

         \[\leadsto \frac{6}{\color{blue}{\left(\mathsf{neg}\left(4 \cdot \sqrt{x}\right)\right) + \left(\mathsf{neg}\left(1\right)\right)}} \]

      7. *-commutative N/A

         \[\leadsto \frac{6}{\left(\mathsf{neg}\left(\color{blue}{\sqrt{x} \cdot 4}\right)\right) + \left(\mathsf{neg}\left(1\right)\right)} \]

      8. distribute-rgt-neg-in N/A

         \[\leadsto \frac{6}{\color{blue}{\sqrt{x} \cdot \left(\mathsf{neg}\left(4\right)\right)} + \left(\mathsf{neg}\left(1\right)\right)} \]

      9. metadata-eval N/A

         \[\leadsto \frac{6}{\sqrt{x} \cdot \color{blue}{-4} + \left(\mathsf{neg}\left(1\right)\right)} \]

      10. metadata-eval N/A

          \[\leadsto \frac{6}{\sqrt{x} \cdot \color{blue}{\left(4 \cdot -1\right)} + \left(\mathsf{neg}\left(1\right)\right)} \]

      11. metadata-eval N/A

          \[\leadsto \frac{6}{\sqrt{x} \cdot \left(4 \cdot -1\right) + \color{blue}{-1}} \]

      12. lower-fma.f64 N/A

          \[\leadsto \frac{6}{\color{blue}{\mathsf{fma}\left(\sqrt{x}, 4 \cdot -1, -1\right)}} \]

      13. lower-sqrt.f64 N/A

          \[\leadsto \frac{6}{\mathsf{fma}\left(\color{blue}{\sqrt{x}}, 4 \cdot -1, -1\right)} \]

      14. metadata-eval 97.8

          \[\leadsto \frac{6}{\mathsf{fma}\left(\sqrt{x}, \color{blue}{-4}, -1\right)} \]

   5. Applied rewrites 97.8%

      \[\leadsto \color{blue}{\frac{6}{\mathsf{fma}\left(\sqrt{x}, -4, -1\right)}} \]

   if -2 < (/.f64 (*.f64 #s(literal 6 binary64) (-.f64 x #s(literal 1 binary64))) (+.f64 (+.f64 x #s(literal 1 binary64)) (*.f64 #s(literal 4 binary64) (sqrt.f64 x))))

   1. Initial program 99.7%

      \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      2. lift-+.f64 N/A

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

      3. flip-+ N/A

         \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\frac{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}{\left(x + 1\right) - 4 \cdot \sqrt{x}}}} \]

      4. associate-/r/ N/A

         \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)} \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)} \]

      5. associate-*l/ N/A

         \[\leadsto \color{blue}{\frac{\left(6 \cdot \left(x - 1\right)\right) \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}} \]

      6. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{\left(6 \cdot \left(x - 1\right)\right) \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}} \]

   4. Applied rewrites 50.8%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(6, x, -6\right) \cdot \left(\left(x + 1\right) + \sqrt{x} \cdot -4\right)}{\mathsf{fma}\left(x + 1, x + 1, x \cdot -16\right)}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \color{blue}{6 \cdot \left(1 + -4 \cdot \sqrt{\frac{1}{x}}\right)} \]
   6. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto 6 \cdot \color{blue}{\left(-4 \cdot \sqrt{\frac{1}{x}} + 1\right)} \]

      2. distribute-rgt-in N/A

         \[\leadsto \color{blue}{\left(-4 \cdot \sqrt{\frac{1}{x}}\right) \cdot 6 + 1 \cdot 6} \]

      3. metadata-eval N/A

         \[\leadsto \left(-4 \cdot \sqrt{\frac{1}{x}}\right) \cdot 6 + \color{blue}{6} \]

      4. *-commutative N/A

         \[\leadsto \color{blue}{\left(\sqrt{\frac{1}{x}} \cdot -4\right)} \cdot 6 + 6 \]

      5. associate-*l* N/A

         \[\leadsto \color{blue}{\sqrt{\frac{1}{x}} \cdot \left(-4 \cdot 6\right)} + 6 \]

      6. metadata-eval N/A

         \[\leadsto \sqrt{\frac{1}{x}} \cdot \color{blue}{-24} + 6 \]

      7. metadata-eval N/A

         \[\leadsto \sqrt{\frac{1}{x}} \cdot \color{blue}{\left(6 \cdot -4\right)} + 6 \]

      8. lower-fma.f64 N/A

         \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{\frac{1}{x}}, 6 \cdot -4, 6\right)} \]

      9. lower-sqrt.f64 N/A

         \[\leadsto \mathsf{fma}\left(\color{blue}{\sqrt{\frac{1}{x}}}, 6 \cdot -4, 6\right) \]

      10. lower-/.f64 N/A

          \[\leadsto \mathsf{fma}\left(\sqrt{\color{blue}{\frac{1}{x}}}, 6 \cdot -4, 6\right) \]

      11. metadata-eval 97.1

          \[\leadsto \mathsf{fma}\left(\sqrt{\frac{1}{x}}, \color{blue}{-24}, 6\right) \]

   7. Applied rewrites 97.1%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{\frac{1}{x}}, -24, 6\right)} \]
3. Recombined 2 regimes into one program.

4. Final simplification 97.4%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{6 \cdot \left(x + -1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \leq -2:\\ \;\;\;\;\frac{6}{\mathsf{fma}\left(\sqrt{x}, -4, -1\right)}\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(\sqrt{\frac{1}{x}}, -24, 6\right)\\ \end{array} \]
5. Add Preprocessing

Alternative 7: 99.9% accurate, 1.1× speedup

Math

\[\begin{array}{l} \\ 6 \cdot \frac{x + -1}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \end{array} \]

FPCore

(FPCore (x)
 :precision binary64
 (* 6.0 (/ (+ x -1.0) (+ x (fma 4.0 (sqrt x) 1.0)))))

C

double code(double x) {
	return 6.0 * ((x + -1.0) / (x + fma(4.0, sqrt(x), 1.0)));
}

Julia

function code(x)
	return Float64(6.0 * Float64(Float64(x + -1.0) / Float64(x + fma(4.0, sqrt(x), 1.0))))
end

Wolfram

code[x_] := N[(6.0 * N[(N[(x + -1.0), $MachinePrecision] / N[(x + N[(4.0 * N[Sqrt[x], $MachinePrecision] + 1.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.8%

   \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

   2. lift-*.f64 N/A

      \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]

   3. associate-/l* N/A

      \[\leadsto \color{blue}{6 \cdot \frac{x - 1}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

   4. *-commutative N/A

      \[\leadsto \color{blue}{\frac{x - 1}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \cdot 6} \]

   5. lower-*.f64 N/A

      \[\leadsto \color{blue}{\frac{x - 1}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \cdot 6} \]

   6. lower-/.f64 99.9

      \[\leadsto \color{blue}{\frac{x - 1}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \cdot 6 \]

   7. lift--.f64 N/A

      \[\leadsto \frac{\color{blue}{x - 1}}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \cdot 6 \]

   8. sub-neg N/A

      \[\leadsto \frac{\color{blue}{x + \left(\mathsf{neg}\left(1\right)\right)}}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \cdot 6 \]

   9. lower-+.f64 N/A

      \[\leadsto \frac{\color{blue}{x + \left(\mathsf{neg}\left(1\right)\right)}}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \cdot 6 \]

   10. metadata-eval 99.9

       \[\leadsto \frac{x + \color{blue}{-1}}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \cdot 6 \]

   11. lift-+.f64 N/A

       \[\leadsto \frac{x + -1}{\color{blue}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \cdot 6 \]

   12. lift-+.f64 N/A

       \[\leadsto \frac{x + -1}{\color{blue}{\left(x + 1\right)} + 4 \cdot \sqrt{x}} \cdot 6 \]

   13. associate-+l+ N/A

       \[\leadsto \frac{x + -1}{\color{blue}{x + \left(1 + 4 \cdot \sqrt{x}\right)}} \cdot 6 \]

   14. lower-+.f64 N/A

       \[\leadsto \frac{x + -1}{\color{blue}{x + \left(1 + 4 \cdot \sqrt{x}\right)}} \cdot 6 \]

   15. +-commutative N/A

       \[\leadsto \frac{x + -1}{x + \color{blue}{\left(4 \cdot \sqrt{x} + 1\right)}} \cdot 6 \]

   16. lift-*.f64 N/A

       \[\leadsto \frac{x + -1}{x + \left(\color{blue}{4 \cdot \sqrt{x}} + 1\right)} \cdot 6 \]

   17. lower-fma.f64 99.9

       \[\leadsto \frac{x + -1}{x + \color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \cdot 6 \]

4. Applied rewrites 99.9%

   \[\leadsto \color{blue}{\frac{x + -1}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \cdot 6} \]

5. Final simplification 99.9%

   \[\leadsto 6 \cdot \frac{x + -1}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]
6. Add Preprocessing

Alternative 8: 99.7% accurate, 1.1× speedup

Math

\[\begin{array}{l} \\ \frac{\mathsf{fma}\left(6, x, -6\right)}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)} \end{array} \]

FPCore

(FPCore (x)
 :precision binary64
 (/ (fma 6.0 x -6.0) (+ 1.0 (fma 4.0 (sqrt x) x))))

C

double code(double x) {
	return fma(6.0, x, -6.0) / (1.0 + fma(4.0, sqrt(x), x));
}

Julia

function code(x)
	return Float64(fma(6.0, x, -6.0) / Float64(1.0 + fma(4.0, sqrt(x), x)))
end

Wolfram

code[x_] := N[(N[(6.0 * x + -6.0), $MachinePrecision] / N[(1.0 + N[(4.0 * N[Sqrt[x], $MachinePrecision] + x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.8%

   \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

   2. lift-*.f64 N/A

      \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]

   3. associate-/l* N/A

      \[\leadsto \color{blue}{6 \cdot \frac{x - 1}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

   4. clear-num N/A

      \[\leadsto 6 \cdot \color{blue}{\frac{1}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

   5. un-div-inv N/A

      \[\leadsto \color{blue}{\frac{6}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

   6. lower-/.f64 N/A

      \[\leadsto \color{blue}{\frac{6}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

   7. lower-/.f64 99.9

      \[\leadsto \frac{6}{\color{blue}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}}} \]

   8. lift-+.f64 N/A

      \[\leadsto \frac{6}{\frac{\color{blue}{\left(x + 1\right) + 4 \cdot \sqrt{x}}}{x - 1}} \]

   9. lift-+.f64 N/A

      \[\leadsto \frac{6}{\frac{\color{blue}{\left(x + 1\right)} + 4 \cdot \sqrt{x}}{x - 1}} \]

   10. associate-+l+ N/A

       \[\leadsto \frac{6}{\frac{\color{blue}{x + \left(1 + 4 \cdot \sqrt{x}\right)}}{x - 1}} \]

   11. lower-+.f64 N/A

       \[\leadsto \frac{6}{\frac{\color{blue}{x + \left(1 + 4 \cdot \sqrt{x}\right)}}{x - 1}} \]

   12. +-commutative N/A

       \[\leadsto \frac{6}{\frac{x + \color{blue}{\left(4 \cdot \sqrt{x} + 1\right)}}{x - 1}} \]

   13. lift-*.f64 N/A

       \[\leadsto \frac{6}{\frac{x + \left(\color{blue}{4 \cdot \sqrt{x}} + 1\right)}{x - 1}} \]

   14. lower-fma.f64 99.9

       \[\leadsto \frac{6}{\frac{x + \color{blue}{\mathsf{fma}\left(4, \sqrt{x}, 1\right)}}{x - 1}} \]

   15. lift--.f64 N/A

       \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{\color{blue}{x - 1}}} \]

   16. sub-neg N/A

       \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{\color{blue}{x + \left(\mathsf{neg}\left(1\right)\right)}}} \]

   17. lower-+.f64 N/A

       \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{\color{blue}{x + \left(\mathsf{neg}\left(1\right)\right)}}} \]

   18. metadata-eval 99.9

       \[\leadsto \frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + \color{blue}{-1}}} \]

4. Applied rewrites 99.9%

   \[\leadsto \color{blue}{\frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + -1}}} \]
5. Step-by-step derivation

   1. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{6}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + -1}}} \]

   2. lift-/.f64 N/A

      \[\leadsto \frac{6}{\color{blue}{\frac{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}{x + -1}}} \]

   3. associate-/r/ N/A

      \[\leadsto \color{blue}{\frac{6}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \cdot \left(x + -1\right)} \]

   4. associate-*l/ N/A

      \[\leadsto \color{blue}{\frac{6 \cdot \left(x + -1\right)}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]

   5. lift-+.f64 N/A

      \[\leadsto \frac{6 \cdot \color{blue}{\left(x + -1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   6. metadata-eval N/A

      \[\leadsto \frac{6 \cdot \left(x + \color{blue}{\left(\mathsf{neg}\left(1\right)\right)}\right)}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   7. sub-neg N/A

      \[\leadsto \frac{6 \cdot \color{blue}{\left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   8. lift--.f64 N/A

      \[\leadsto \frac{6 \cdot \color{blue}{\left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   9. lift-*.f64 N/A

      \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   10. lower-/.f64 99.8

       \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]

   11. lift-*.f64 N/A

       \[\leadsto \frac{\color{blue}{6 \cdot \left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   12. lift--.f64 N/A

       \[\leadsto \frac{6 \cdot \color{blue}{\left(x - 1\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   13. sub-neg N/A

       \[\leadsto \frac{6 \cdot \color{blue}{\left(x + \left(\mathsf{neg}\left(1\right)\right)\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   14. metadata-eval N/A

       \[\leadsto \frac{6 \cdot \left(x + \color{blue}{-1}\right)}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   15. distribute-lft-in N/A

       \[\leadsto \frac{\color{blue}{6 \cdot x + 6 \cdot -1}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   16. metadata-eval N/A

       \[\leadsto \frac{6 \cdot x + \color{blue}{-6}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   17. lift-fma.f64 99.8

       \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(6, x, -6\right)}}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)} \]

   18. lift-+.f64 N/A

       \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{\color{blue}{x + \mathsf{fma}\left(4, \sqrt{x}, 1\right)}} \]

   19. lift-fma.f64 N/A

       \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{x + \color{blue}{\left(4 \cdot \sqrt{x} + 1\right)}} \]

   20. associate-+r+ N/A

       \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{\color{blue}{\left(x + 4 \cdot \sqrt{x}\right) + 1}} \]

   21. +-commutative N/A

       \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{\color{blue}{1 + \left(x + 4 \cdot \sqrt{x}\right)}} \]

   22. lower-+.f64 N/A

       \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{\color{blue}{1 + \left(x + 4 \cdot \sqrt{x}\right)}} \]

   23. +-commutative N/A

       \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{1 + \color{blue}{\left(4 \cdot \sqrt{x} + x\right)}} \]

   24. lower-fma.f64 99.8

       \[\leadsto \frac{\mathsf{fma}\left(6, x, -6\right)}{1 + \color{blue}{\mathsf{fma}\left(4, \sqrt{x}, x\right)}} \]

6. Applied rewrites 99.8%

   \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(6, x, -6\right)}{1 + \mathsf{fma}\left(4, \sqrt{x}, x\right)}} \]
7. Add Preprocessing

Alternative 9: 53.6% accurate, 2.4× speedup

Math

\[\begin{array}{l} \\ \mathsf{fma}\left(\sqrt{x}, 24, -6\right) \end{array} \]

FPCore

(FPCore (x) :precision binary64 (fma (sqrt x) 24.0 -6.0))

C

double code(double x) {
	return fma(sqrt(x), 24.0, -6.0);
}

Julia

function code(x)
	return fma(sqrt(x), 24.0, -6.0)
end

Wolfram

code[x_] := N[(N[Sqrt[x], $MachinePrecision] * 24.0 + -6.0), $MachinePrecision]

Derivation

1. Initial program 99.8%

   \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

   2. lift-+.f64 N/A

      \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

   3. flip-+ N/A

      \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\frac{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}{\left(x + 1\right) - 4 \cdot \sqrt{x}}}} \]

   4. associate-/r/ N/A

      \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)} \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)} \]

   5. associate-*l/ N/A

      \[\leadsto \color{blue}{\frac{\left(6 \cdot \left(x - 1\right)\right) \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}} \]

   6. lower-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\left(6 \cdot \left(x - 1\right)\right) \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}} \]

4. Applied rewrites 75.5%

   \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(6, x, -6\right) \cdot \left(\left(x + 1\right) + \sqrt{x} \cdot -4\right)}{\mathsf{fma}\left(x + 1, x + 1, x \cdot -16\right)}} \]

5. Taylor expanded in x around 0

   \[\leadsto \color{blue}{-6 \cdot \left(1 + -4 \cdot \sqrt{x}\right)} \]
6. Step-by-step derivation

   1. distribute-rgt-in N/A

      \[\leadsto \color{blue}{1 \cdot -6 + \left(-4 \cdot \sqrt{x}\right) \cdot -6} \]

   2. metadata-eval N/A

      \[\leadsto \color{blue}{-6} + \left(-4 \cdot \sqrt{x}\right) \cdot -6 \]

   3. +-commutative N/A

      \[\leadsto \color{blue}{\left(-4 \cdot \sqrt{x}\right) \cdot -6 + -6} \]

   4. *-commutative N/A

      \[\leadsto \color{blue}{\left(\sqrt{x} \cdot -4\right)} \cdot -6 + -6 \]

   5. associate-*l* N/A

      \[\leadsto \color{blue}{\sqrt{x} \cdot \left(-4 \cdot -6\right)} + -6 \]

   6. metadata-eval N/A

      \[\leadsto \sqrt{x} \cdot \color{blue}{24} + -6 \]

   7. metadata-eval N/A

      \[\leadsto \sqrt{x} \cdot \color{blue}{\left(-6 \cdot -4\right)} + -6 \]

   8. lower-fma.f64 N/A

      \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{x}, -6 \cdot -4, -6\right)} \]

   9. lower-sqrt.f64 N/A

      \[\leadsto \mathsf{fma}\left(\color{blue}{\sqrt{x}}, -6 \cdot -4, -6\right) \]

   10. metadata-eval 52.6

       \[\leadsto \mathsf{fma}\left(\sqrt{x}, \color{blue}{24}, -6\right) \]

7. Applied rewrites 52.6%

   \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{x}, 24, -6\right)} \]
8. Add Preprocessing

Alternative 10: 4.3% accurate, 2.6× speedup

Math

\[\begin{array}{l} \\ \sqrt{x} \cdot 24 \end{array} \]

FPCore

(FPCore (x) :precision binary64 (* (sqrt x) 24.0))

C

double code(double x) {
	return sqrt(x) * 24.0;
}

Fortran

real(8) function code(x)
    real(8), intent (in) :: x
    code = sqrt(x) * 24.0d0
end function

Java

public static double code(double x) {
	return Math.sqrt(x) * 24.0;
}

Python

def code(x):
	return math.sqrt(x) * 24.0

Julia

function code(x)
	return Float64(sqrt(x) * 24.0)
end

MATLAB

function tmp = code(x)
	tmp = sqrt(x) * 24.0;
end

Wolfram

code[x_] := N[(N[Sqrt[x], $MachinePrecision] * 24.0), $MachinePrecision]

Derivation

1. Initial program 99.8%

   \[\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}} \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

   2. lift-+.f64 N/A

      \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\left(x + 1\right) + 4 \cdot \sqrt{x}}} \]

   3. flip-+ N/A

      \[\leadsto \frac{6 \cdot \left(x - 1\right)}{\color{blue}{\frac{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}{\left(x + 1\right) - 4 \cdot \sqrt{x}}}} \]

   4. associate-/r/ N/A

      \[\leadsto \color{blue}{\frac{6 \cdot \left(x - 1\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)} \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)} \]

   5. associate-*l/ N/A

      \[\leadsto \color{blue}{\frac{\left(6 \cdot \left(x - 1\right)\right) \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}} \]

   6. lower-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\left(6 \cdot \left(x - 1\right)\right) \cdot \left(\left(x + 1\right) - 4 \cdot \sqrt{x}\right)}{\left(x + 1\right) \cdot \left(x + 1\right) - \left(4 \cdot \sqrt{x}\right) \cdot \left(4 \cdot \sqrt{x}\right)}} \]

4. Applied rewrites 75.5%

   \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(6, x, -6\right) \cdot \left(\left(x + 1\right) + \sqrt{x} \cdot -4\right)}{\mathsf{fma}\left(x + 1, x + 1, x \cdot -16\right)}} \]

5. Taylor expanded in x around 0

   \[\leadsto \color{blue}{-6 \cdot \left(1 + -4 \cdot \sqrt{x}\right)} \]
6. Step-by-step derivation

   1. distribute-rgt-in N/A

      \[\leadsto \color{blue}{1 \cdot -6 + \left(-4 \cdot \sqrt{x}\right) \cdot -6} \]

   2. metadata-eval N/A

      \[\leadsto \color{blue}{-6} + \left(-4 \cdot \sqrt{x}\right) \cdot -6 \]

   3. +-commutative N/A

      \[\leadsto \color{blue}{\left(-4 \cdot \sqrt{x}\right) \cdot -6 + -6} \]

   4. *-commutative N/A

      \[\leadsto \color{blue}{\left(\sqrt{x} \cdot -4\right)} \cdot -6 + -6 \]

   5. associate-*l* N/A

      \[\leadsto \color{blue}{\sqrt{x} \cdot \left(-4 \cdot -6\right)} + -6 \]

   6. metadata-eval N/A

      \[\leadsto \sqrt{x} \cdot \color{blue}{24} + -6 \]

   7. metadata-eval N/A

      \[\leadsto \sqrt{x} \cdot \color{blue}{\left(-6 \cdot -4\right)} + -6 \]

   8. lower-fma.f64 N/A

      \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{x}, -6 \cdot -4, -6\right)} \]

   9. lower-sqrt.f64 N/A

      \[\leadsto \mathsf{fma}\left(\color{blue}{\sqrt{x}}, -6 \cdot -4, -6\right) \]

   10. metadata-eval 52.6

       \[\leadsto \mathsf{fma}\left(\sqrt{x}, \color{blue}{24}, -6\right) \]

7. Applied rewrites 52.6%

   \[\leadsto \color{blue}{\mathsf{fma}\left(\sqrt{x}, 24, -6\right)} \]

8. Taylor expanded in x around inf

   \[\leadsto 24 \cdot \color{blue}{\sqrt{x}} \]
9. Step-by-step derivation

10. Applied rewrites 4.4%

    \[\leadsto \sqrt{x} \cdot \color{blue}{24} \]
11. Add Preprocessing

Developer Target 1: 99.9% accurate, 0.9× speedup

Math

\[\begin{array}{l} \\ \frac{6}{\frac{\left(x + 1\right) + 4 \cdot \sqrt{x}}{x - 1}} \end{array} \]

FPCore

(FPCore (x)
 :precision binary64
 (/ 6.0 (/ (+ (+ x 1.0) (* 4.0 (sqrt x))) (- x 1.0))))

C

double code(double x) {
	return 6.0 / (((x + 1.0) + (4.0 * sqrt(x))) / (x - 1.0));
}

Fortran

real(8) function code(x)
    real(8), intent (in) :: x
    code = 6.0d0 / (((x + 1.0d0) + (4.0d0 * sqrt(x))) / (x - 1.0d0))
end function

Java

public static double code(double x) {
	return 6.0 / (((x + 1.0) + (4.0 * Math.sqrt(x))) / (x - 1.0));
}

Python

def code(x):
	return 6.0 / (((x + 1.0) + (4.0 * math.sqrt(x))) / (x - 1.0))

Julia

function code(x)
	return Float64(6.0 / Float64(Float64(Float64(x + 1.0) + Float64(4.0 * sqrt(x))) / Float64(x - 1.0)))
end

MATLAB

function tmp = code(x)
	tmp = 6.0 / (((x + 1.0) + (4.0 * sqrt(x))) / (x - 1.0));
end

Wolfram

code[x_] := N[(6.0 / N[(N[(N[(x + 1.0), $MachinePrecision] + N[(4.0 * N[Sqrt[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / N[(x - 1.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Reproduce

herbie shell --seed 2024219 
(FPCore (x)
  :name "Data.Approximate.Numerics:blog from approximate-0.2.2.1"
  :precision binary64

  :alt
  (! :herbie-platform default (/ 6 (/ (+ (+ x 1) (* 4 (sqrt x))) (- x 1))))

  (/ (* 6.0 (- x 1.0)) (+ (+ x 1.0) (* 4.0 (sqrt x)))))