Migdal et al, Equation (64)

Percentage Accurate: 99.5% → 99.6%

Time: 12.3s

Alternatives: 11

Speedup: 1.9×

• 43.8% of points produce a very large (infinite) output. You may want to add a precondition.

Specification

Math

\[\begin{array}{l} \\ \begin{array}{l} t_1 := \frac{\cos th}{\sqrt{2}}\\ t\_1 \cdot \left(a1 \cdot a1\right) + t\_1 \cdot \left(a2 \cdot a2\right) \end{array} \end{array} \]

FPCore

(FPCore (a1 a2 th)
 :precision binary64
 (let* ((t_1 (/ (cos th) (sqrt 2.0))))
   (+ (* t_1 (* a1 a1)) (* t_1 (* a2 a2)))))

C

double code(double a1, double a2, double th) {
	double t_1 = cos(th) / sqrt(2.0);
	return (t_1 * (a1 * a1)) + (t_1 * (a2 * a2));
}

Fortran

real(8) function code(a1, a2, th)
    real(8), intent (in) :: a1
    real(8), intent (in) :: a2
    real(8), intent (in) :: th
    real(8) :: t_1
    t_1 = cos(th) / sqrt(2.0d0)
    code = (t_1 * (a1 * a1)) + (t_1 * (a2 * a2))
end function

Java

public static double code(double a1, double a2, double th) {
	double t_1 = Math.cos(th) / Math.sqrt(2.0);
	return (t_1 * (a1 * a1)) + (t_1 * (a2 * a2));
}

Python

def code(a1, a2, th):
	t_1 = math.cos(th) / math.sqrt(2.0)
	return (t_1 * (a1 * a1)) + (t_1 * (a2 * a2))

Julia

function code(a1, a2, th)
	t_1 = Float64(cos(th) / sqrt(2.0))
	return Float64(Float64(t_1 * Float64(a1 * a1)) + Float64(t_1 * Float64(a2 * a2)))
end

MATLAB

function tmp = code(a1, a2, th)
	t_1 = cos(th) / sqrt(2.0);
	tmp = (t_1 * (a1 * a1)) + (t_1 * (a2 * a2));
end

Wolfram

code[a1_, a2_, th_] := Block[{t$95$1 = N[(N[Cos[th], $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]}, N[(N[(t$95$1 * N[(a1 * a1), $MachinePrecision]), $MachinePrecision] + N[(t$95$1 * N[(a2 * a2), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]

Initial Program: 99.5% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_1 := \frac{\cos th}{\sqrt{2}}\\ t\_1 \cdot \left(a1 \cdot a1\right) + t\_1 \cdot \left(a2 \cdot a2\right) \end{array} \end{array} \]

FPCore

(FPCore (a1 a2 th)
 :precision binary64
 (let* ((t_1 (/ (cos th) (sqrt 2.0))))
   (+ (* t_1 (* a1 a1)) (* t_1 (* a2 a2)))))

C

double code(double a1, double a2, double th) {
	double t_1 = cos(th) / sqrt(2.0);
	return (t_1 * (a1 * a1)) + (t_1 * (a2 * a2));
}

Fortran

real(8) function code(a1, a2, th)
    real(8), intent (in) :: a1
    real(8), intent (in) :: a2
    real(8), intent (in) :: th
    real(8) :: t_1
    t_1 = cos(th) / sqrt(2.0d0)
    code = (t_1 * (a1 * a1)) + (t_1 * (a2 * a2))
end function

Java

public static double code(double a1, double a2, double th) {
	double t_1 = Math.cos(th) / Math.sqrt(2.0);
	return (t_1 * (a1 * a1)) + (t_1 * (a2 * a2));
}

Python

def code(a1, a2, th):
	t_1 = math.cos(th) / math.sqrt(2.0)
	return (t_1 * (a1 * a1)) + (t_1 * (a2 * a2))

Julia

function code(a1, a2, th)
	t_1 = Float64(cos(th) / sqrt(2.0))
	return Float64(Float64(t_1 * Float64(a1 * a1)) + Float64(t_1 * Float64(a2 * a2)))
end

MATLAB

function tmp = code(a1, a2, th)
	t_1 = cos(th) / sqrt(2.0);
	tmp = (t_1 * (a1 * a1)) + (t_1 * (a2 * a2));
end

Wolfram

code[a1_, a2_, th_] := Block[{t$95$1 = N[(N[Cos[th], $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]}, N[(N[(t$95$1 * N[(a1 * a1), $MachinePrecision]), $MachinePrecision] + N[(t$95$1 * N[(a2 * a2), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]

Alternative 1: 99.6% accurate, 1.9× speedup

Math

\[\begin{array}{l} \\ \frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}} \cdot \cos th \end{array} \]

FPCore

(FPCore (a1 a2 th)
 :precision binary64
 (* (/ (fma a1 a1 (* a2 a2)) (sqrt 2.0)) (cos th)))

C

double code(double a1, double a2, double th) {
	return (fma(a1, a1, (a2 * a2)) / sqrt(2.0)) * cos(th);
}

Julia

function code(a1, a2, th)
	return Float64(Float64(fma(a1, a1, Float64(a2 * a2)) / sqrt(2.0)) * cos(th))
end

Wolfram

code[a1_, a2_, th_] := N[(N[(N[(a1 * a1 + N[(a2 * a2), $MachinePrecision]), $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision] * N[Cos[th], $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.6%

   \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift-cos.f64 N/A

      \[\leadsto \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   2. lift-sqrt.f64 N/A

      \[\leadsto \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   3. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   4. lift-*.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a1 \cdot a1\right)} + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   5. lift-cos.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   6. lift-sqrt.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

   7. lift-/.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

   8. lift-*.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a2 \cdot a2\right)} \]

   9. distribute-lft-out N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)} \]

   10. lift-/.f64 N/A

       \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

   11. div-inv N/A

       \[\leadsto \color{blue}{\left(\cos th \cdot \frac{1}{\sqrt{2}}\right)} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

   12. associate-*l* N/A

       \[\leadsto \color{blue}{\cos th \cdot \left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right)} \]

   13. *-commutative N/A

       \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

   14. lower-*.f64 N/A

       \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

4. Applied rewrites 99.6%

   \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}} \cdot \cos th} \]
5. Add Preprocessing

Alternative 2: 77.5% accurate, 0.8× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_1 := \mathsf{fma}\left(a2, a2, a1 \cdot a1\right)\\ t_2 := \frac{\cos th}{\sqrt{2}}\\ \mathbf{if}\;t\_2 \cdot \left(a1 \cdot a1\right) + \left(a2 \cdot a2\right) \cdot t\_2 \leq -4 \cdot 10^{-162}:\\ \;\;\;\;\frac{th \cdot \left(th \cdot \left(t\_1 \cdot -0.5\right)\right)}{\sqrt{2}}\\ \mathbf{else}:\\ \;\;\;\;\frac{t\_1}{\sqrt{2}}\\ \end{array} \end{array} \]

FPCore

(FPCore (a1 a2 th)
 :precision binary64
 (let* ((t_1 (fma a2 a2 (* a1 a1))) (t_2 (/ (cos th) (sqrt 2.0))))
   (if (<= (+ (* t_2 (* a1 a1)) (* (* a2 a2) t_2)) -4e-162)
     (/ (* th (* th (* t_1 -0.5))) (sqrt 2.0))
     (/ t_1 (sqrt 2.0)))))

C

double code(double a1, double a2, double th) {
	double t_1 = fma(a2, a2, (a1 * a1));
	double t_2 = cos(th) / sqrt(2.0);
	double tmp;
	if (((t_2 * (a1 * a1)) + ((a2 * a2) * t_2)) <= -4e-162) {
		tmp = (th * (th * (t_1 * -0.5))) / sqrt(2.0);
	} else {
		tmp = t_1 / sqrt(2.0);
	}
	return tmp;
}

Julia

function code(a1, a2, th)
	t_1 = fma(a2, a2, Float64(a1 * a1))
	t_2 = Float64(cos(th) / sqrt(2.0))
	tmp = 0.0
	if (Float64(Float64(t_2 * Float64(a1 * a1)) + Float64(Float64(a2 * a2) * t_2)) <= -4e-162)
		tmp = Float64(Float64(th * Float64(th * Float64(t_1 * -0.5))) / sqrt(2.0));
	else
		tmp = Float64(t_1 / sqrt(2.0));
	end
	return tmp
end

Wolfram

code[a1_, a2_, th_] := Block[{t$95$1 = N[(a2 * a2 + N[(a1 * a1), $MachinePrecision]), $MachinePrecision]}, Block[{t$95$2 = N[(N[Cos[th], $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]}, If[LessEqual[N[(N[(t$95$2 * N[(a1 * a1), $MachinePrecision]), $MachinePrecision] + N[(N[(a2 * a2), $MachinePrecision] * t$95$2), $MachinePrecision]), $MachinePrecision], -4e-162], N[(N[(th * N[(th * N[(t$95$1 * -0.5), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision], N[(t$95$1 / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]]]]

Derivation

1. Split input into 2 regimes

2. if (+.f64 (*.f64 (/.f64 (cos.f64 th) (sqrt.f64 #s(literal 2 binary64))) (*.f64 a1 a1)) (*.f64 (/.f64 (cos.f64 th) (sqrt.f64 #s(literal 2 binary64))) (*.f64 a2 a2))) < -3.99999999999999982e-162

   1. Initial program 99.6%

      \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
   2. Add Preprocessing

   3. Taylor expanded in a1 around inf

      \[\leadsto \color{blue}{{a1}^{2} \cdot \left(\frac{\cos th}{\sqrt{2}} + \frac{{a2}^{2} \cdot \cos th}{{a1}^{2} \cdot \sqrt{2}}\right)} \]
   4. Step-by-step derivation

      1. times-frac N/A

         \[\leadsto {a1}^{2} \cdot \left(\frac{\cos th}{\sqrt{2}} + \color{blue}{\frac{{a2}^{2}}{{a1}^{2}} \cdot \frac{\cos th}{\sqrt{2}}}\right) \]

      2. distribute-rgt1-in N/A

         \[\leadsto {a1}^{2} \cdot \color{blue}{\left(\left(\frac{{a2}^{2}}{{a1}^{2}} + 1\right) \cdot \frac{\cos th}{\sqrt{2}}\right)} \]

      3. associate-*r/ N/A

         \[\leadsto {a1}^{2} \cdot \color{blue}{\frac{\left(\frac{{a2}^{2}}{{a1}^{2}} + 1\right) \cdot \cos th}{\sqrt{2}}} \]

      4. associate-*r/ N/A

         \[\leadsto \color{blue}{\frac{{a1}^{2} \cdot \left(\left(\frac{{a2}^{2}}{{a1}^{2}} + 1\right) \cdot \cos th\right)}{\sqrt{2}}} \]

      5. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{{a1}^{2} \cdot \left(\left(\frac{{a2}^{2}}{{a1}^{2}} + 1\right) \cdot \cos th\right)}{\sqrt{2}}} \]

   5. Applied rewrites 69.9%

      \[\leadsto \color{blue}{\frac{\left(a1 \cdot a1\right) \cdot \left(\mathsf{fma}\left(a2, \frac{a2}{a1 \cdot a1}, 1\right) \cdot \cos th\right)}{\sqrt{2}}} \]

   6. Taylor expanded in th around 0

      \[\leadsto \frac{\color{blue}{\frac{-1}{2} \cdot \left({a1}^{2} \cdot \left({th}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)\right) + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}}{\sqrt{2}} \]
   7. Step-by-step derivation

      1. associate-*r* N/A

         \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot {a1}^{2}\right) \cdot \left({th}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      2. *-commutative N/A

         \[\leadsto \frac{\left(\frac{-1}{2} \cdot {a1}^{2}\right) \cdot \color{blue}{\left(\left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right) \cdot {th}^{2}\right)} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      3. associate-*r* N/A

         \[\leadsto \frac{\color{blue}{\left(\left(\frac{-1}{2} \cdot {a1}^{2}\right) \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right) \cdot {th}^{2}} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      4. associate-*r* N/A

         \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)\right)} \cdot {th}^{2} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      5. *-commutative N/A

         \[\leadsto \frac{\color{blue}{{th}^{2} \cdot \left(\frac{-1}{2} \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)\right)} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      6. associate-*r* N/A

         \[\leadsto \frac{\color{blue}{\left({th}^{2} \cdot \frac{-1}{2}\right) \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      7. *-commutative N/A

         \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot {th}^{2}\right)} \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right) + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      8. distribute-lft1-in N/A

         \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot {th}^{2} + 1\right) \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)}}{\sqrt{2}} \]

      9. +-commutative N/A

         \[\leadsto \frac{\color{blue}{\left(1 + \frac{-1}{2} \cdot {th}^{2}\right)} \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)}{\sqrt{2}} \]

      10. lower-*.f64 N/A

          \[\leadsto \frac{\color{blue}{\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)}}{\sqrt{2}} \]

   8. Applied rewrites 57.3%

      \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(th, th \cdot -0.5, 1\right) \cdot \mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}}{\sqrt{2}} \]

   9. Taylor expanded in th around inf

      \[\leadsto \color{blue}{\frac{-1}{2} \cdot \frac{{th}^{2} \cdot \left({a1}^{2} + {a2}^{2}\right)}{\sqrt{2}}} \]
   10. Step-by-step derivation

       1. associate-*r/ N/A

          \[\leadsto \color{blue}{\frac{\frac{-1}{2} \cdot \left({th}^{2} \cdot \left({a1}^{2} + {a2}^{2}\right)\right)}{\sqrt{2}}} \]

       2. lower-/.f64 N/A

          \[\leadsto \color{blue}{\frac{\frac{-1}{2} \cdot \left({th}^{2} \cdot \left({a1}^{2} + {a2}^{2}\right)\right)}{\sqrt{2}}} \]

       3. *-commutative N/A

          \[\leadsto \frac{\frac{-1}{2} \cdot \color{blue}{\left(\left({a1}^{2} + {a2}^{2}\right) \cdot {th}^{2}\right)}}{\sqrt{2}} \]

       4. associate-*r* N/A

          \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot \left({a1}^{2} + {a2}^{2}\right)\right) \cdot {th}^{2}}}{\sqrt{2}} \]

       5. unpow2 N/A

          \[\leadsto \frac{\left(\frac{-1}{2} \cdot \left({a1}^{2} + {a2}^{2}\right)\right) \cdot \color{blue}{\left(th \cdot th\right)}}{\sqrt{2}} \]

       6. associate-*r* N/A

          \[\leadsto \frac{\color{blue}{\left(\left(\frac{-1}{2} \cdot \left({a1}^{2} + {a2}^{2}\right)\right) \cdot th\right) \cdot th}}{\sqrt{2}} \]

       7. lower-*.f64 N/A

          \[\leadsto \frac{\color{blue}{\left(\left(\frac{-1}{2} \cdot \left({a1}^{2} + {a2}^{2}\right)\right) \cdot th\right) \cdot th}}{\sqrt{2}} \]

       8. lower-*.f64 N/A

          \[\leadsto \frac{\color{blue}{\left(\left(\frac{-1}{2} \cdot \left({a1}^{2} + {a2}^{2}\right)\right) \cdot th\right)} \cdot th}{\sqrt{2}} \]

       9. *-commutative N/A

          \[\leadsto \frac{\left(\color{blue}{\left(\left({a1}^{2} + {a2}^{2}\right) \cdot \frac{-1}{2}\right)} \cdot th\right) \cdot th}{\sqrt{2}} \]

       10. lower-*.f64 N/A

           \[\leadsto \frac{\left(\color{blue}{\left(\left({a1}^{2} + {a2}^{2}\right) \cdot \frac{-1}{2}\right)} \cdot th\right) \cdot th}{\sqrt{2}} \]

       11. +-commutative N/A

           \[\leadsto \frac{\left(\left(\color{blue}{\left({a2}^{2} + {a1}^{2}\right)} \cdot \frac{-1}{2}\right) \cdot th\right) \cdot th}{\sqrt{2}} \]

       12. unpow2 N/A

           \[\leadsto \frac{\left(\left(\left(\color{blue}{a2 \cdot a2} + {a1}^{2}\right) \cdot \frac{-1}{2}\right) \cdot th\right) \cdot th}{\sqrt{2}} \]

       13. lower-fma.f64 N/A

           \[\leadsto \frac{\left(\left(\color{blue}{\mathsf{fma}\left(a2, a2, {a1}^{2}\right)} \cdot \frac{-1}{2}\right) \cdot th\right) \cdot th}{\sqrt{2}} \]

       14. unpow2 N/A

           \[\leadsto \frac{\left(\left(\mathsf{fma}\left(a2, a2, \color{blue}{a1 \cdot a1}\right) \cdot \frac{-1}{2}\right) \cdot th\right) \cdot th}{\sqrt{2}} \]

       15. lower-*.f64 N/A

           \[\leadsto \frac{\left(\left(\mathsf{fma}\left(a2, a2, \color{blue}{a1 \cdot a1}\right) \cdot \frac{-1}{2}\right) \cdot th\right) \cdot th}{\sqrt{2}} \]

       16. lower-sqrt.f64 57.3

           \[\leadsto \frac{\left(\left(\mathsf{fma}\left(a2, a2, a1 \cdot a1\right) \cdot -0.5\right) \cdot th\right) \cdot th}{\color{blue}{\sqrt{2}}} \]

   11. Applied rewrites 57.3%

       \[\leadsto \color{blue}{\frac{\left(\left(\mathsf{fma}\left(a2, a2, a1 \cdot a1\right) \cdot -0.5\right) \cdot th\right) \cdot th}{\sqrt{2}}} \]

   if -3.99999999999999982e-162 < (+.f64 (*.f64 (/.f64 (cos.f64 th) (sqrt.f64 #s(literal 2 binary64))) (*.f64 a1 a1)) (*.f64 (/.f64 (cos.f64 th) (sqrt.f64 #s(literal 2 binary64))) (*.f64 a2 a2)))

   1. Initial program 99.5%

      \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-cos.f64 N/A

         \[\leadsto \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      2. lift-sqrt.f64 N/A

         \[\leadsto \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      3. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      4. lift-*.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a1 \cdot a1\right)} + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      5. lift-cos.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      6. lift-sqrt.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

      7. lift-/.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

      8. lift-*.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a2 \cdot a2\right)} \]

      9. distribute-lft-out N/A

         \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)} \]

      10. lift-/.f64 N/A

          \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

      11. div-inv N/A

          \[\leadsto \color{blue}{\left(\cos th \cdot \frac{1}{\sqrt{2}}\right)} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

      12. associate-*l* N/A

          \[\leadsto \color{blue}{\cos th \cdot \left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right)} \]

      13. *-commutative N/A

          \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

      14. lower-*.f64 N/A

          \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

   4. Applied rewrites 99.6%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}} \cdot \cos th} \]

   5. Taylor expanded in th around 0

      \[\leadsto \color{blue}{\frac{{a1}^{2} + {a2}^{2}}{\sqrt{2}}} \]
   6. Step-by-step derivation

      1. *-lft-identity N/A

         \[\leadsto \frac{\color{blue}{1 \cdot {a1}^{2}} + {a2}^{2}}{\sqrt{2}} \]

      2. *-rgt-identity N/A

         \[\leadsto \frac{1 \cdot {a1}^{2} + \color{blue}{{a2}^{2} \cdot 1}}{\sqrt{2}} \]

      3. *-inverses N/A

         \[\leadsto \frac{1 \cdot {a1}^{2} + {a2}^{2} \cdot \color{blue}{\frac{{a1}^{2}}{{a1}^{2}}}}{\sqrt{2}} \]

      4. associate-/l* N/A

         \[\leadsto \frac{1 \cdot {a1}^{2} + \color{blue}{\frac{{a2}^{2} \cdot {a1}^{2}}{{a1}^{2}}}}{\sqrt{2}} \]

      5. associate-*l/ N/A

         \[\leadsto \frac{1 \cdot {a1}^{2} + \color{blue}{\frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2}}}{\sqrt{2}} \]

      6. distribute-rgt-in N/A

         \[\leadsto \frac{\color{blue}{{a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}}{\sqrt{2}} \]

      7. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{{a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}}} \]

      8. distribute-rgt-in N/A

         \[\leadsto \frac{\color{blue}{1 \cdot {a1}^{2} + \frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2}}}{\sqrt{2}} \]

      9. *-lft-identity N/A

         \[\leadsto \frac{\color{blue}{{a1}^{2}} + \frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2}}{\sqrt{2}} \]

      10. +-commutative N/A

          \[\leadsto \frac{\color{blue}{\frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2} + {a1}^{2}}}{\sqrt{2}} \]

      11. associate-*l/ N/A

          \[\leadsto \frac{\color{blue}{\frac{{a2}^{2} \cdot {a1}^{2}}{{a1}^{2}}} + {a1}^{2}}{\sqrt{2}} \]

      12. associate-/l* N/A

          \[\leadsto \frac{\color{blue}{{a2}^{2} \cdot \frac{{a1}^{2}}{{a1}^{2}}} + {a1}^{2}}{\sqrt{2}} \]

      13. *-inverses N/A

          \[\leadsto \frac{{a2}^{2} \cdot \color{blue}{1} + {a1}^{2}}{\sqrt{2}} \]

      14. *-rgt-identity N/A

          \[\leadsto \frac{\color{blue}{{a2}^{2}} + {a1}^{2}}{\sqrt{2}} \]

      15. unpow2 N/A

          \[\leadsto \frac{\color{blue}{a2 \cdot a2} + {a1}^{2}}{\sqrt{2}} \]

      16. lower-fma.f64 N/A

          \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(a2, a2, {a1}^{2}\right)}}{\sqrt{2}} \]

      17. unpow2 N/A

          \[\leadsto \frac{\mathsf{fma}\left(a2, a2, \color{blue}{a1 \cdot a1}\right)}{\sqrt{2}} \]

      18. lower-*.f64 N/A

          \[\leadsto \frac{\mathsf{fma}\left(a2, a2, \color{blue}{a1 \cdot a1}\right)}{\sqrt{2}} \]

      19. lower-sqrt.f64 82.9

          \[\leadsto \frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\color{blue}{\sqrt{2}}} \]

   7. Applied rewrites 82.9%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\sqrt{2}}} \]
3. Recombined 2 regimes into one program.

4. Final simplification 77.6%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \left(a2 \cdot a2\right) \cdot \frac{\cos th}{\sqrt{2}} \leq -4 \cdot 10^{-162}:\\ \;\;\;\;\frac{th \cdot \left(th \cdot \left(\mathsf{fma}\left(a2, a2, a1 \cdot a1\right) \cdot -0.5\right)\right)}{\sqrt{2}}\\ \mathbf{else}:\\ \;\;\;\;\frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\sqrt{2}}\\ \end{array} \]
5. Add Preprocessing

Alternative 3: 75.6% accurate, 0.8× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_1 := \frac{\cos th}{\sqrt{2}}\\ \mathbf{if}\;t\_1 \cdot \left(a1 \cdot a1\right) + \left(a2 \cdot a2\right) \cdot t\_1 \leq -4 \cdot 10^{-162}:\\ \;\;\;\;\frac{a2 \cdot \left(a2 \cdot \mathsf{fma}\left(-0.5, th \cdot th, 1\right)\right)}{\sqrt{2}}\\ \mathbf{else}:\\ \;\;\;\;\frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\sqrt{2}}\\ \end{array} \end{array} \]

FPCore

(FPCore (a1 a2 th)
 :precision binary64
 (let* ((t_1 (/ (cos th) (sqrt 2.0))))
   (if (<= (+ (* t_1 (* a1 a1)) (* (* a2 a2) t_1)) -4e-162)
     (/ (* a2 (* a2 (fma -0.5 (* th th) 1.0))) (sqrt 2.0))
     (/ (fma a2 a2 (* a1 a1)) (sqrt 2.0)))))

C

double code(double a1, double a2, double th) {
	double t_1 = cos(th) / sqrt(2.0);
	double tmp;
	if (((t_1 * (a1 * a1)) + ((a2 * a2) * t_1)) <= -4e-162) {
		tmp = (a2 * (a2 * fma(-0.5, (th * th), 1.0))) / sqrt(2.0);
	} else {
		tmp = fma(a2, a2, (a1 * a1)) / sqrt(2.0);
	}
	return tmp;
}

Julia

function code(a1, a2, th)
	t_1 = Float64(cos(th) / sqrt(2.0))
	tmp = 0.0
	if (Float64(Float64(t_1 * Float64(a1 * a1)) + Float64(Float64(a2 * a2) * t_1)) <= -4e-162)
		tmp = Float64(Float64(a2 * Float64(a2 * fma(-0.5, Float64(th * th), 1.0))) / sqrt(2.0));
	else
		tmp = Float64(fma(a2, a2, Float64(a1 * a1)) / sqrt(2.0));
	end
	return tmp
end

Wolfram

code[a1_, a2_, th_] := Block[{t$95$1 = N[(N[Cos[th], $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]}, If[LessEqual[N[(N[(t$95$1 * N[(a1 * a1), $MachinePrecision]), $MachinePrecision] + N[(N[(a2 * a2), $MachinePrecision] * t$95$1), $MachinePrecision]), $MachinePrecision], -4e-162], N[(N[(a2 * N[(a2 * N[(-0.5 * N[(th * th), $MachinePrecision] + 1.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision], N[(N[(a2 * a2 + N[(a1 * a1), $MachinePrecision]), $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]]]

Derivation

1. Split input into 2 regimes

2. if (+.f64 (*.f64 (/.f64 (cos.f64 th) (sqrt.f64 #s(literal 2 binary64))) (*.f64 a1 a1)) (*.f64 (/.f64 (cos.f64 th) (sqrt.f64 #s(literal 2 binary64))) (*.f64 a2 a2))) < -3.99999999999999982e-162

   1. Initial program 99.6%

      \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
   2. Add Preprocessing

   3. Taylor expanded in a1 around inf

      \[\leadsto \color{blue}{{a1}^{2} \cdot \left(\frac{\cos th}{\sqrt{2}} + \frac{{a2}^{2} \cdot \cos th}{{a1}^{2} \cdot \sqrt{2}}\right)} \]
   4. Step-by-step derivation

      1. times-frac N/A

         \[\leadsto {a1}^{2} \cdot \left(\frac{\cos th}{\sqrt{2}} + \color{blue}{\frac{{a2}^{2}}{{a1}^{2}} \cdot \frac{\cos th}{\sqrt{2}}}\right) \]

      2. distribute-rgt1-in N/A

         \[\leadsto {a1}^{2} \cdot \color{blue}{\left(\left(\frac{{a2}^{2}}{{a1}^{2}} + 1\right) \cdot \frac{\cos th}{\sqrt{2}}\right)} \]

      3. associate-*r/ N/A

         \[\leadsto {a1}^{2} \cdot \color{blue}{\frac{\left(\frac{{a2}^{2}}{{a1}^{2}} + 1\right) \cdot \cos th}{\sqrt{2}}} \]

      4. associate-*r/ N/A

         \[\leadsto \color{blue}{\frac{{a1}^{2} \cdot \left(\left(\frac{{a2}^{2}}{{a1}^{2}} + 1\right) \cdot \cos th\right)}{\sqrt{2}}} \]

      5. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{{a1}^{2} \cdot \left(\left(\frac{{a2}^{2}}{{a1}^{2}} + 1\right) \cdot \cos th\right)}{\sqrt{2}}} \]

   5. Applied rewrites 69.9%

      \[\leadsto \color{blue}{\frac{\left(a1 \cdot a1\right) \cdot \left(\mathsf{fma}\left(a2, \frac{a2}{a1 \cdot a1}, 1\right) \cdot \cos th\right)}{\sqrt{2}}} \]

   6. Taylor expanded in th around 0

      \[\leadsto \frac{\color{blue}{\frac{-1}{2} \cdot \left({a1}^{2} \cdot \left({th}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)\right) + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}}{\sqrt{2}} \]
   7. Step-by-step derivation

      1. associate-*r* N/A

         \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot {a1}^{2}\right) \cdot \left({th}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      2. *-commutative N/A

         \[\leadsto \frac{\left(\frac{-1}{2} \cdot {a1}^{2}\right) \cdot \color{blue}{\left(\left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right) \cdot {th}^{2}\right)} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      3. associate-*r* N/A

         \[\leadsto \frac{\color{blue}{\left(\left(\frac{-1}{2} \cdot {a1}^{2}\right) \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right) \cdot {th}^{2}} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      4. associate-*r* N/A

         \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)\right)} \cdot {th}^{2} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      5. *-commutative N/A

         \[\leadsto \frac{\color{blue}{{th}^{2} \cdot \left(\frac{-1}{2} \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)\right)} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      6. associate-*r* N/A

         \[\leadsto \frac{\color{blue}{\left({th}^{2} \cdot \frac{-1}{2}\right) \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      7. *-commutative N/A

         \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot {th}^{2}\right)} \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right) + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      8. distribute-lft1-in N/A

         \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot {th}^{2} + 1\right) \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)}}{\sqrt{2}} \]

      9. +-commutative N/A

         \[\leadsto \frac{\color{blue}{\left(1 + \frac{-1}{2} \cdot {th}^{2}\right)} \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)}{\sqrt{2}} \]

      10. lower-*.f64 N/A

          \[\leadsto \frac{\color{blue}{\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)}}{\sqrt{2}} \]

   8. Applied rewrites 57.3%

      \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(th, th \cdot -0.5, 1\right) \cdot \mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}}{\sqrt{2}} \]

   9. Taylor expanded in a2 around inf

      \[\leadsto \color{blue}{\frac{{a2}^{2} \cdot \left(1 + \frac{-1}{2} \cdot {th}^{2}\right)}{\sqrt{2}}} \]
   10. Step-by-step derivation

       1. lower-/.f64 N/A

          \[\leadsto \color{blue}{\frac{{a2}^{2} \cdot \left(1 + \frac{-1}{2} \cdot {th}^{2}\right)}{\sqrt{2}}} \]

       2. *-commutative N/A

          \[\leadsto \frac{\color{blue}{\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot {a2}^{2}}}{\sqrt{2}} \]

       3. unpow2 N/A

          \[\leadsto \frac{\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot \color{blue}{\left(a2 \cdot a2\right)}}{\sqrt{2}} \]

       4. associate-*r* N/A

          \[\leadsto \frac{\color{blue}{\left(\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot a2\right) \cdot a2}}{\sqrt{2}} \]

       5. lower-*.f64 N/A

          \[\leadsto \frac{\color{blue}{\left(\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot a2\right) \cdot a2}}{\sqrt{2}} \]

       6. lower-*.f64 N/A

          \[\leadsto \frac{\color{blue}{\left(\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot a2\right)} \cdot a2}{\sqrt{2}} \]

       7. +-commutative N/A

          \[\leadsto \frac{\left(\color{blue}{\left(\frac{-1}{2} \cdot {th}^{2} + 1\right)} \cdot a2\right) \cdot a2}{\sqrt{2}} \]

       8. lower-fma.f64 N/A

          \[\leadsto \frac{\left(\color{blue}{\mathsf{fma}\left(\frac{-1}{2}, {th}^{2}, 1\right)} \cdot a2\right) \cdot a2}{\sqrt{2}} \]

       9. unpow2 N/A

          \[\leadsto \frac{\left(\mathsf{fma}\left(\frac{-1}{2}, \color{blue}{th \cdot th}, 1\right) \cdot a2\right) \cdot a2}{\sqrt{2}} \]

       10. lower-*.f64 N/A

           \[\leadsto \frac{\left(\mathsf{fma}\left(\frac{-1}{2}, \color{blue}{th \cdot th}, 1\right) \cdot a2\right) \cdot a2}{\sqrt{2}} \]

       11. lower-sqrt.f64 51.6

           \[\leadsto \frac{\left(\mathsf{fma}\left(-0.5, th \cdot th, 1\right) \cdot a2\right) \cdot a2}{\color{blue}{\sqrt{2}}} \]

   11. Applied rewrites 51.6%

       \[\leadsto \color{blue}{\frac{\left(\mathsf{fma}\left(-0.5, th \cdot th, 1\right) \cdot a2\right) \cdot a2}{\sqrt{2}}} \]

   if -3.99999999999999982e-162 < (+.f64 (*.f64 (/.f64 (cos.f64 th) (sqrt.f64 #s(literal 2 binary64))) (*.f64 a1 a1)) (*.f64 (/.f64 (cos.f64 th) (sqrt.f64 #s(literal 2 binary64))) (*.f64 a2 a2)))

   1. Initial program 99.5%

      \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-cos.f64 N/A

         \[\leadsto \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      2. lift-sqrt.f64 N/A

         \[\leadsto \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      3. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      4. lift-*.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a1 \cdot a1\right)} + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      5. lift-cos.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      6. lift-sqrt.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

      7. lift-/.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

      8. lift-*.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a2 \cdot a2\right)} \]

      9. distribute-lft-out N/A

         \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)} \]

      10. lift-/.f64 N/A

          \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

      11. div-inv N/A

          \[\leadsto \color{blue}{\left(\cos th \cdot \frac{1}{\sqrt{2}}\right)} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

      12. associate-*l* N/A

          \[\leadsto \color{blue}{\cos th \cdot \left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right)} \]

      13. *-commutative N/A

          \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

      14. lower-*.f64 N/A

          \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

   4. Applied rewrites 99.6%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}} \cdot \cos th} \]

   5. Taylor expanded in th around 0

      \[\leadsto \color{blue}{\frac{{a1}^{2} + {a2}^{2}}{\sqrt{2}}} \]
   6. Step-by-step derivation

      1. *-lft-identity N/A

         \[\leadsto \frac{\color{blue}{1 \cdot {a1}^{2}} + {a2}^{2}}{\sqrt{2}} \]

      2. *-rgt-identity N/A

         \[\leadsto \frac{1 \cdot {a1}^{2} + \color{blue}{{a2}^{2} \cdot 1}}{\sqrt{2}} \]

      3. *-inverses N/A

         \[\leadsto \frac{1 \cdot {a1}^{2} + {a2}^{2} \cdot \color{blue}{\frac{{a1}^{2}}{{a1}^{2}}}}{\sqrt{2}} \]

      4. associate-/l* N/A

         \[\leadsto \frac{1 \cdot {a1}^{2} + \color{blue}{\frac{{a2}^{2} \cdot {a1}^{2}}{{a1}^{2}}}}{\sqrt{2}} \]

      5. associate-*l/ N/A

         \[\leadsto \frac{1 \cdot {a1}^{2} + \color{blue}{\frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2}}}{\sqrt{2}} \]

      6. distribute-rgt-in N/A

         \[\leadsto \frac{\color{blue}{{a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}}{\sqrt{2}} \]

      7. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{{a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}}} \]

      8. distribute-rgt-in N/A

         \[\leadsto \frac{\color{blue}{1 \cdot {a1}^{2} + \frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2}}}{\sqrt{2}} \]

      9. *-lft-identity N/A

         \[\leadsto \frac{\color{blue}{{a1}^{2}} + \frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2}}{\sqrt{2}} \]

      10. +-commutative N/A

          \[\leadsto \frac{\color{blue}{\frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2} + {a1}^{2}}}{\sqrt{2}} \]

      11. associate-*l/ N/A

          \[\leadsto \frac{\color{blue}{\frac{{a2}^{2} \cdot {a1}^{2}}{{a1}^{2}}} + {a1}^{2}}{\sqrt{2}} \]

      12. associate-/l* N/A

          \[\leadsto \frac{\color{blue}{{a2}^{2} \cdot \frac{{a1}^{2}}{{a1}^{2}}} + {a1}^{2}}{\sqrt{2}} \]

      13. *-inverses N/A

          \[\leadsto \frac{{a2}^{2} \cdot \color{blue}{1} + {a1}^{2}}{\sqrt{2}} \]

      14. *-rgt-identity N/A

          \[\leadsto \frac{\color{blue}{{a2}^{2}} + {a1}^{2}}{\sqrt{2}} \]

      15. unpow2 N/A

          \[\leadsto \frac{\color{blue}{a2 \cdot a2} + {a1}^{2}}{\sqrt{2}} \]

      16. lower-fma.f64 N/A

          \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(a2, a2, {a1}^{2}\right)}}{\sqrt{2}} \]

      17. unpow2 N/A

          \[\leadsto \frac{\mathsf{fma}\left(a2, a2, \color{blue}{a1 \cdot a1}\right)}{\sqrt{2}} \]

      18. lower-*.f64 N/A

          \[\leadsto \frac{\mathsf{fma}\left(a2, a2, \color{blue}{a1 \cdot a1}\right)}{\sqrt{2}} \]

      19. lower-sqrt.f64 82.9

          \[\leadsto \frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\color{blue}{\sqrt{2}}} \]

   7. Applied rewrites 82.9%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\sqrt{2}}} \]
3. Recombined 2 regimes into one program.

4. Final simplification 76.4%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \left(a2 \cdot a2\right) \cdot \frac{\cos th}{\sqrt{2}} \leq -4 \cdot 10^{-162}:\\ \;\;\;\;\frac{a2 \cdot \left(a2 \cdot \mathsf{fma}\left(-0.5, th \cdot th, 1\right)\right)}{\sqrt{2}}\\ \mathbf{else}:\\ \;\;\;\;\frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\sqrt{2}}\\ \end{array} \]
5. Add Preprocessing

Alternative 4: 75.6% accurate, 0.8× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_1 := \frac{\cos th}{\sqrt{2}}\\ \mathbf{if}\;t\_1 \cdot \left(a1 \cdot a1\right) + \left(a2 \cdot a2\right) \cdot t\_1 \leq -4 \cdot 10^{-213}:\\ \;\;\;\;\frac{a1 \cdot \left(a1 \cdot \mathsf{fma}\left(-0.5, th \cdot th, 1\right)\right)}{\sqrt{2}}\\ \mathbf{else}:\\ \;\;\;\;\frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\sqrt{2}}\\ \end{array} \end{array} \]

FPCore

(FPCore (a1 a2 th)
 :precision binary64
 (let* ((t_1 (/ (cos th) (sqrt 2.0))))
   (if (<= (+ (* t_1 (* a1 a1)) (* (* a2 a2) t_1)) -4e-213)
     (/ (* a1 (* a1 (fma -0.5 (* th th) 1.0))) (sqrt 2.0))
     (/ (fma a2 a2 (* a1 a1)) (sqrt 2.0)))))

C

double code(double a1, double a2, double th) {
	double t_1 = cos(th) / sqrt(2.0);
	double tmp;
	if (((t_1 * (a1 * a1)) + ((a2 * a2) * t_1)) <= -4e-213) {
		tmp = (a1 * (a1 * fma(-0.5, (th * th), 1.0))) / sqrt(2.0);
	} else {
		tmp = fma(a2, a2, (a1 * a1)) / sqrt(2.0);
	}
	return tmp;
}

Julia

function code(a1, a2, th)
	t_1 = Float64(cos(th) / sqrt(2.0))
	tmp = 0.0
	if (Float64(Float64(t_1 * Float64(a1 * a1)) + Float64(Float64(a2 * a2) * t_1)) <= -4e-213)
		tmp = Float64(Float64(a1 * Float64(a1 * fma(-0.5, Float64(th * th), 1.0))) / sqrt(2.0));
	else
		tmp = Float64(fma(a2, a2, Float64(a1 * a1)) / sqrt(2.0));
	end
	return tmp
end

Wolfram

code[a1_, a2_, th_] := Block[{t$95$1 = N[(N[Cos[th], $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]}, If[LessEqual[N[(N[(t$95$1 * N[(a1 * a1), $MachinePrecision]), $MachinePrecision] + N[(N[(a2 * a2), $MachinePrecision] * t$95$1), $MachinePrecision]), $MachinePrecision], -4e-213], N[(N[(a1 * N[(a1 * N[(-0.5 * N[(th * th), $MachinePrecision] + 1.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision], N[(N[(a2 * a2 + N[(a1 * a1), $MachinePrecision]), $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]]]

Derivation

1. Split input into 2 regimes

2. if (+.f64 (*.f64 (/.f64 (cos.f64 th) (sqrt.f64 #s(literal 2 binary64))) (*.f64 a1 a1)) (*.f64 (/.f64 (cos.f64 th) (sqrt.f64 #s(literal 2 binary64))) (*.f64 a2 a2))) < -3.9999999999999998e-213

   1. Initial program 99.6%

      \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
   2. Add Preprocessing

   3. Taylor expanded in a1 around inf

      \[\leadsto \color{blue}{{a1}^{2} \cdot \left(\frac{\cos th}{\sqrt{2}} + \frac{{a2}^{2} \cdot \cos th}{{a1}^{2} \cdot \sqrt{2}}\right)} \]
   4. Step-by-step derivation

      1. times-frac N/A

         \[\leadsto {a1}^{2} \cdot \left(\frac{\cos th}{\sqrt{2}} + \color{blue}{\frac{{a2}^{2}}{{a1}^{2}} \cdot \frac{\cos th}{\sqrt{2}}}\right) \]

      2. distribute-rgt1-in N/A

         \[\leadsto {a1}^{2} \cdot \color{blue}{\left(\left(\frac{{a2}^{2}}{{a1}^{2}} + 1\right) \cdot \frac{\cos th}{\sqrt{2}}\right)} \]

      3. associate-*r/ N/A

         \[\leadsto {a1}^{2} \cdot \color{blue}{\frac{\left(\frac{{a2}^{2}}{{a1}^{2}} + 1\right) \cdot \cos th}{\sqrt{2}}} \]

      4. associate-*r/ N/A

         \[\leadsto \color{blue}{\frac{{a1}^{2} \cdot \left(\left(\frac{{a2}^{2}}{{a1}^{2}} + 1\right) \cdot \cos th\right)}{\sqrt{2}}} \]

      5. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{{a1}^{2} \cdot \left(\left(\frac{{a2}^{2}}{{a1}^{2}} + 1\right) \cdot \cos th\right)}{\sqrt{2}}} \]

   5. Applied rewrites 69.2%

      \[\leadsto \color{blue}{\frac{\left(a1 \cdot a1\right) \cdot \left(\mathsf{fma}\left(a2, \frac{a2}{a1 \cdot a1}, 1\right) \cdot \cos th\right)}{\sqrt{2}}} \]

   6. Taylor expanded in th around 0

      \[\leadsto \frac{\color{blue}{\frac{-1}{2} \cdot \left({a1}^{2} \cdot \left({th}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)\right) + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}}{\sqrt{2}} \]
   7. Step-by-step derivation

      1. associate-*r* N/A

         \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot {a1}^{2}\right) \cdot \left({th}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      2. *-commutative N/A

         \[\leadsto \frac{\left(\frac{-1}{2} \cdot {a1}^{2}\right) \cdot \color{blue}{\left(\left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right) \cdot {th}^{2}\right)} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      3. associate-*r* N/A

         \[\leadsto \frac{\color{blue}{\left(\left(\frac{-1}{2} \cdot {a1}^{2}\right) \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right) \cdot {th}^{2}} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      4. associate-*r* N/A

         \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)\right)} \cdot {th}^{2} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      5. *-commutative N/A

         \[\leadsto \frac{\color{blue}{{th}^{2} \cdot \left(\frac{-1}{2} \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)\right)} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      6. associate-*r* N/A

         \[\leadsto \frac{\color{blue}{\left({th}^{2} \cdot \frac{-1}{2}\right) \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)} + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      7. *-commutative N/A

         \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot {th}^{2}\right)} \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right) + {a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}} \]

      8. distribute-lft1-in N/A

         \[\leadsto \frac{\color{blue}{\left(\frac{-1}{2} \cdot {th}^{2} + 1\right) \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)}}{\sqrt{2}} \]

      9. +-commutative N/A

         \[\leadsto \frac{\color{blue}{\left(1 + \frac{-1}{2} \cdot {th}^{2}\right)} \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)}{\sqrt{2}} \]

      10. lower-*.f64 N/A

          \[\leadsto \frac{\color{blue}{\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot \left({a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)\right)}}{\sqrt{2}} \]

   8. Applied rewrites 55.3%

      \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(th, th \cdot -0.5, 1\right) \cdot \mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}}{\sqrt{2}} \]

   9. Taylor expanded in a2 around 0

      \[\leadsto \color{blue}{\frac{{a1}^{2} \cdot \left(1 + \frac{-1}{2} \cdot {th}^{2}\right)}{\sqrt{2}}} \]
   10. Step-by-step derivation

       1. lower-/.f64 N/A

          \[\leadsto \color{blue}{\frac{{a1}^{2} \cdot \left(1 + \frac{-1}{2} \cdot {th}^{2}\right)}{\sqrt{2}}} \]

       2. *-commutative N/A

          \[\leadsto \frac{\color{blue}{\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot {a1}^{2}}}{\sqrt{2}} \]

       3. unpow2 N/A

          \[\leadsto \frac{\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot \color{blue}{\left(a1 \cdot a1\right)}}{\sqrt{2}} \]

       4. associate-*r* N/A

          \[\leadsto \frac{\color{blue}{\left(\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot a1\right) \cdot a1}}{\sqrt{2}} \]

       5. lower-*.f64 N/A

          \[\leadsto \frac{\color{blue}{\left(\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot a1\right) \cdot a1}}{\sqrt{2}} \]

       6. lower-*.f64 N/A

          \[\leadsto \frac{\color{blue}{\left(\left(1 + \frac{-1}{2} \cdot {th}^{2}\right) \cdot a1\right)} \cdot a1}{\sqrt{2}} \]

       7. +-commutative N/A

          \[\leadsto \frac{\left(\color{blue}{\left(\frac{-1}{2} \cdot {th}^{2} + 1\right)} \cdot a1\right) \cdot a1}{\sqrt{2}} \]

       8. lower-fma.f64 N/A

          \[\leadsto \frac{\left(\color{blue}{\mathsf{fma}\left(\frac{-1}{2}, {th}^{2}, 1\right)} \cdot a1\right) \cdot a1}{\sqrt{2}} \]

       9. unpow2 N/A

          \[\leadsto \frac{\left(\mathsf{fma}\left(\frac{-1}{2}, \color{blue}{th \cdot th}, 1\right) \cdot a1\right) \cdot a1}{\sqrt{2}} \]

       10. lower-*.f64 N/A

           \[\leadsto \frac{\left(\mathsf{fma}\left(\frac{-1}{2}, \color{blue}{th \cdot th}, 1\right) \cdot a1\right) \cdot a1}{\sqrt{2}} \]

       11. lower-sqrt.f64 42.9

           \[\leadsto \frac{\left(\mathsf{fma}\left(-0.5, th \cdot th, 1\right) \cdot a1\right) \cdot a1}{\color{blue}{\sqrt{2}}} \]

   11. Applied rewrites 42.9%

       \[\leadsto \color{blue}{\frac{\left(\mathsf{fma}\left(-0.5, th \cdot th, 1\right) \cdot a1\right) \cdot a1}{\sqrt{2}}} \]

   if -3.9999999999999998e-213 < (+.f64 (*.f64 (/.f64 (cos.f64 th) (sqrt.f64 #s(literal 2 binary64))) (*.f64 a1 a1)) (*.f64 (/.f64 (cos.f64 th) (sqrt.f64 #s(literal 2 binary64))) (*.f64 a2 a2)))

   1. Initial program 99.6%

      \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-cos.f64 N/A

         \[\leadsto \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      2. lift-sqrt.f64 N/A

         \[\leadsto \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      3. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      4. lift-*.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a1 \cdot a1\right)} + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      5. lift-cos.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

      6. lift-sqrt.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

      7. lift-/.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

      8. lift-*.f64 N/A

         \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a2 \cdot a2\right)} \]

      9. distribute-lft-out N/A

         \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)} \]

      10. lift-/.f64 N/A

          \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

      11. div-inv N/A

          \[\leadsto \color{blue}{\left(\cos th \cdot \frac{1}{\sqrt{2}}\right)} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

      12. associate-*l* N/A

          \[\leadsto \color{blue}{\cos th \cdot \left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right)} \]

      13. *-commutative N/A

          \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

      14. lower-*.f64 N/A

          \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

   4. Applied rewrites 99.6%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}} \cdot \cos th} \]

   5. Taylor expanded in th around 0

      \[\leadsto \color{blue}{\frac{{a1}^{2} + {a2}^{2}}{\sqrt{2}}} \]
   6. Step-by-step derivation

      1. *-lft-identity N/A

         \[\leadsto \frac{\color{blue}{1 \cdot {a1}^{2}} + {a2}^{2}}{\sqrt{2}} \]

      2. *-rgt-identity N/A

         \[\leadsto \frac{1 \cdot {a1}^{2} + \color{blue}{{a2}^{2} \cdot 1}}{\sqrt{2}} \]

      3. *-inverses N/A

         \[\leadsto \frac{1 \cdot {a1}^{2} + {a2}^{2} \cdot \color{blue}{\frac{{a1}^{2}}{{a1}^{2}}}}{\sqrt{2}} \]

      4. associate-/l* N/A

         \[\leadsto \frac{1 \cdot {a1}^{2} + \color{blue}{\frac{{a2}^{2} \cdot {a1}^{2}}{{a1}^{2}}}}{\sqrt{2}} \]

      5. associate-*l/ N/A

         \[\leadsto \frac{1 \cdot {a1}^{2} + \color{blue}{\frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2}}}{\sqrt{2}} \]

      6. distribute-rgt-in N/A

         \[\leadsto \frac{\color{blue}{{a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}}{\sqrt{2}} \]

      7. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{{a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}}} \]

      8. distribute-rgt-in N/A

         \[\leadsto \frac{\color{blue}{1 \cdot {a1}^{2} + \frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2}}}{\sqrt{2}} \]

      9. *-lft-identity N/A

         \[\leadsto \frac{\color{blue}{{a1}^{2}} + \frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2}}{\sqrt{2}} \]

      10. +-commutative N/A

          \[\leadsto \frac{\color{blue}{\frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2} + {a1}^{2}}}{\sqrt{2}} \]

      11. associate-*l/ N/A

          \[\leadsto \frac{\color{blue}{\frac{{a2}^{2} \cdot {a1}^{2}}{{a1}^{2}}} + {a1}^{2}}{\sqrt{2}} \]

      12. associate-/l* N/A

          \[\leadsto \frac{\color{blue}{{a2}^{2} \cdot \frac{{a1}^{2}}{{a1}^{2}}} + {a1}^{2}}{\sqrt{2}} \]

      13. *-inverses N/A

          \[\leadsto \frac{{a2}^{2} \cdot \color{blue}{1} + {a1}^{2}}{\sqrt{2}} \]

      14. *-rgt-identity N/A

          \[\leadsto \frac{\color{blue}{{a2}^{2}} + {a1}^{2}}{\sqrt{2}} \]

      15. unpow2 N/A

          \[\leadsto \frac{\color{blue}{a2 \cdot a2} + {a1}^{2}}{\sqrt{2}} \]

      16. lower-fma.f64 N/A

          \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(a2, a2, {a1}^{2}\right)}}{\sqrt{2}} \]

      17. unpow2 N/A

          \[\leadsto \frac{\mathsf{fma}\left(a2, a2, \color{blue}{a1 \cdot a1}\right)}{\sqrt{2}} \]

      18. lower-*.f64 N/A

          \[\leadsto \frac{\mathsf{fma}\left(a2, a2, \color{blue}{a1 \cdot a1}\right)}{\sqrt{2}} \]

      19. lower-sqrt.f64 83.7

          \[\leadsto \frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\color{blue}{\sqrt{2}}} \]

   7. Applied rewrites 83.7%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\sqrt{2}}} \]
3. Recombined 2 regimes into one program.

4. Final simplification 74.9%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \left(a2 \cdot a2\right) \cdot \frac{\cos th}{\sqrt{2}} \leq -4 \cdot 10^{-213}:\\ \;\;\;\;\frac{a1 \cdot \left(a1 \cdot \mathsf{fma}\left(-0.5, th \cdot th, 1\right)\right)}{\sqrt{2}}\\ \mathbf{else}:\\ \;\;\;\;\frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\sqrt{2}}\\ \end{array} \]
5. Add Preprocessing

Alternative 5: 57.9% accurate, 2.0× speedup

Math

\[\begin{array}{l} \\ \frac{a2 \cdot \left(a2 \cdot \cos th\right)}{\sqrt{2}} \end{array} \]

FPCore

(FPCore (a1 a2 th) :precision binary64 (/ (* a2 (* a2 (cos th))) (sqrt 2.0)))

C

double code(double a1, double a2, double th) {
	return (a2 * (a2 * cos(th))) / sqrt(2.0);
}

Fortran

real(8) function code(a1, a2, th)
    real(8), intent (in) :: a1
    real(8), intent (in) :: a2
    real(8), intent (in) :: th
    code = (a2 * (a2 * cos(th))) / sqrt(2.0d0)
end function

Java

public static double code(double a1, double a2, double th) {
	return (a2 * (a2 * Math.cos(th))) / Math.sqrt(2.0);
}

Python

def code(a1, a2, th):
	return (a2 * (a2 * math.cos(th))) / math.sqrt(2.0)

Julia

function code(a1, a2, th)
	return Float64(Float64(a2 * Float64(a2 * cos(th))) / sqrt(2.0))
end

MATLAB

function tmp = code(a1, a2, th)
	tmp = (a2 * (a2 * cos(th))) / sqrt(2.0);
end

Wolfram

code[a1_, a2_, th_] := N[(N[(a2 * N[(a2 * N[Cos[th], $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.6%

   \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift-cos.f64 N/A

      \[\leadsto \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   2. lift-sqrt.f64 N/A

      \[\leadsto \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   3. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   4. lift-*.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a1 \cdot a1\right)} + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   5. lift-cos.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   6. lift-sqrt.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

   7. lift-/.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

   8. lift-*.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a2 \cdot a2\right)} \]

   9. distribute-lft-out N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)} \]

   10. *-commutative N/A

       \[\leadsto \color{blue}{\left(a1 \cdot a1 + a2 \cdot a2\right) \cdot \frac{\cos th}{\sqrt{2}}} \]

   11. lift-/.f64 N/A

       \[\leadsto \left(a1 \cdot a1 + a2 \cdot a2\right) \cdot \color{blue}{\frac{\cos th}{\sqrt{2}}} \]

   12. clear-num N/A

       \[\leadsto \left(a1 \cdot a1 + a2 \cdot a2\right) \cdot \color{blue}{\frac{1}{\frac{\sqrt{2}}{\cos th}}} \]

   13. un-div-inv N/A

       \[\leadsto \color{blue}{\frac{a1 \cdot a1 + a2 \cdot a2}{\frac{\sqrt{2}}{\cos th}}} \]

   14. div-inv N/A

       \[\leadsto \frac{a1 \cdot a1 + a2 \cdot a2}{\color{blue}{\sqrt{2} \cdot \frac{1}{\cos th}}} \]

   15. associate-/r* N/A

       \[\leadsto \color{blue}{\frac{\frac{a1 \cdot a1 + a2 \cdot a2}{\sqrt{2}}}{\frac{1}{\cos th}}} \]

   16. *-lft-identity N/A

       \[\leadsto \frac{\frac{\color{blue}{1 \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)}}{\sqrt{2}}}{\frac{1}{\cos th}} \]

   17. associate-*l/ N/A

       \[\leadsto \frac{\color{blue}{\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)}}{\frac{1}{\cos th}} \]

4. Applied rewrites 99.6%

   \[\leadsto \color{blue}{\frac{\frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}}}{\frac{1}{\cos th}}} \]

5. Taylor expanded in a1 around 0

   \[\leadsto \color{blue}{\frac{{a2}^{2} \cdot \cos th}{\sqrt{2}}} \]
6. Step-by-step derivation

   1. lower-/.f64 N/A

      \[\leadsto \color{blue}{\frac{{a2}^{2} \cdot \cos th}{\sqrt{2}}} \]

   2. unpow2 N/A

      \[\leadsto \frac{\color{blue}{\left(a2 \cdot a2\right)} \cdot \cos th}{\sqrt{2}} \]

   3. associate-*l* N/A

      \[\leadsto \frac{\color{blue}{a2 \cdot \left(a2 \cdot \cos th\right)}}{\sqrt{2}} \]

   4. lower-*.f64 N/A

      \[\leadsto \frac{\color{blue}{a2 \cdot \left(a2 \cdot \cos th\right)}}{\sqrt{2}} \]

   5. lower-*.f64 N/A

      \[\leadsto \frac{a2 \cdot \color{blue}{\left(a2 \cdot \cos th\right)}}{\sqrt{2}} \]

   6. lower-cos.f64 N/A

      \[\leadsto \frac{a2 \cdot \left(a2 \cdot \color{blue}{\cos th}\right)}{\sqrt{2}} \]

   7. lower-sqrt.f64 61.5

      \[\leadsto \frac{a2 \cdot \left(a2 \cdot \cos th\right)}{\color{blue}{\sqrt{2}}} \]

7. Applied rewrites 61.5%

   \[\leadsto \color{blue}{\frac{a2 \cdot \left(a2 \cdot \cos th\right)}{\sqrt{2}}} \]
8. Add Preprocessing

Alternative 6: 57.9% accurate, 2.0× speedup

Math

\[\begin{array}{l} \\ \cos th \cdot \frac{a2 \cdot a2}{\sqrt{2}} \end{array} \]

FPCore

(FPCore (a1 a2 th) :precision binary64 (* (cos th) (/ (* a2 a2) (sqrt 2.0))))

C

double code(double a1, double a2, double th) {
	return cos(th) * ((a2 * a2) / sqrt(2.0));
}

Fortran

real(8) function code(a1, a2, th)
    real(8), intent (in) :: a1
    real(8), intent (in) :: a2
    real(8), intent (in) :: th
    code = cos(th) * ((a2 * a2) / sqrt(2.0d0))
end function

Java

public static double code(double a1, double a2, double th) {
	return Math.cos(th) * ((a2 * a2) / Math.sqrt(2.0));
}

Python

def code(a1, a2, th):
	return math.cos(th) * ((a2 * a2) / math.sqrt(2.0))

Julia

function code(a1, a2, th)
	return Float64(cos(th) * Float64(Float64(a2 * a2) / sqrt(2.0)))
end

MATLAB

function tmp = code(a1, a2, th)
	tmp = cos(th) * ((a2 * a2) / sqrt(2.0));
end

Wolfram

code[a1_, a2_, th_] := N[(N[Cos[th], $MachinePrecision] * N[(N[(a2 * a2), $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.6%

   \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift-cos.f64 N/A

      \[\leadsto \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   2. lift-sqrt.f64 N/A

      \[\leadsto \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   3. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   4. lift-*.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a1 \cdot a1\right)} + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   5. lift-cos.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   6. lift-sqrt.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

   7. lift-/.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

   8. lift-*.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a2 \cdot a2\right)} \]

   9. distribute-lft-out N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)} \]

   10. lift-/.f64 N/A

       \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

   11. div-inv N/A

       \[\leadsto \color{blue}{\left(\cos th \cdot \frac{1}{\sqrt{2}}\right)} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

   12. associate-*l* N/A

       \[\leadsto \color{blue}{\cos th \cdot \left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right)} \]

   13. *-commutative N/A

       \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

   14. lower-*.f64 N/A

       \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

4. Applied rewrites 99.6%

   \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}} \cdot \cos th} \]

5. Taylor expanded in a1 around 0

   \[\leadsto \color{blue}{\frac{{a2}^{2}}{\sqrt{2}}} \cdot \cos th \]
6. Step-by-step derivation

   1. lower-/.f64 N/A

      \[\leadsto \color{blue}{\frac{{a2}^{2}}{\sqrt{2}}} \cdot \cos th \]

   2. unpow2 N/A

      \[\leadsto \frac{\color{blue}{a2 \cdot a2}}{\sqrt{2}} \cdot \cos th \]

   3. lower-*.f64 N/A

      \[\leadsto \frac{\color{blue}{a2 \cdot a2}}{\sqrt{2}} \cdot \cos th \]

   4. lower-sqrt.f64 61.5

      \[\leadsto \frac{a2 \cdot a2}{\color{blue}{\sqrt{2}}} \cdot \cos th \]

7. Applied rewrites 61.5%

   \[\leadsto \color{blue}{\frac{a2 \cdot a2}{\sqrt{2}}} \cdot \cos th \]

8. Final simplification 61.5%

   \[\leadsto \cos th \cdot \frac{a2 \cdot a2}{\sqrt{2}} \]
9. Add Preprocessing

Alternative 7: 57.9% accurate, 2.0× speedup

Math

\[\begin{array}{l} \\ a2 \cdot \left(a2 \cdot \frac{\cos th}{\sqrt{2}}\right) \end{array} \]

FPCore

(FPCore (a1 a2 th) :precision binary64 (* a2 (* a2 (/ (cos th) (sqrt 2.0)))))

C

double code(double a1, double a2, double th) {
	return a2 * (a2 * (cos(th) / sqrt(2.0)));
}

Fortran

real(8) function code(a1, a2, th)
    real(8), intent (in) :: a1
    real(8), intent (in) :: a2
    real(8), intent (in) :: th
    code = a2 * (a2 * (cos(th) / sqrt(2.0d0)))
end function

Java

public static double code(double a1, double a2, double th) {
	return a2 * (a2 * (Math.cos(th) / Math.sqrt(2.0)));
}

Python

def code(a1, a2, th):
	return a2 * (a2 * (math.cos(th) / math.sqrt(2.0)))

Julia

function code(a1, a2, th)
	return Float64(a2 * Float64(a2 * Float64(cos(th) / sqrt(2.0))))
end

MATLAB

function tmp = code(a1, a2, th)
	tmp = a2 * (a2 * (cos(th) / sqrt(2.0)));
end

Wolfram

code[a1_, a2_, th_] := N[(a2 * N[(a2 * N[(N[Cos[th], $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.6%

   \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift-cos.f64 N/A

      \[\leadsto \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   2. lift-sqrt.f64 N/A

      \[\leadsto \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   3. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   4. lift-*.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a1 \cdot a1\right)} + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   5. lift-cos.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   6. lift-sqrt.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

   7. lift-/.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

   8. lift-*.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a2 \cdot a2\right)} \]

   9. distribute-lft-out N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)} \]

   10. lift-/.f64 N/A

       \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

   11. div-inv N/A

       \[\leadsto \color{blue}{\left(\cos th \cdot \frac{1}{\sqrt{2}}\right)} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

   12. associate-*l* N/A

       \[\leadsto \color{blue}{\cos th \cdot \left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right)} \]

   13. *-commutative N/A

       \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

   14. lower-*.f64 N/A

       \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

4. Applied rewrites 99.6%

   \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}} \cdot \cos th} \]
5. Step-by-step derivation

   1. lift-*.f64 N/A

      \[\leadsto \frac{a1 \cdot a1 + \color{blue}{a2 \cdot a2}}{\sqrt{2}} \cdot \cos th \]

   2. lift-fma.f64 N/A

      \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}}{\sqrt{2}} \cdot \cos th \]

   3. lift-sqrt.f64 N/A

      \[\leadsto \frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\color{blue}{\sqrt{2}}} \cdot \cos th \]

   4. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}}} \cdot \cos th \]

   5. lift-cos.f64 N/A

      \[\leadsto \frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}} \cdot \color{blue}{\cos th} \]

   6. *-commutative N/A

      \[\leadsto \color{blue}{\cos th \cdot \frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}}} \]

   7. lift-/.f64 N/A

      \[\leadsto \cos th \cdot \color{blue}{\frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}}} \]

   8. clear-num N/A

      \[\leadsto \cos th \cdot \color{blue}{\frac{1}{\frac{\sqrt{2}}{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}}} \]

   9. un-div-inv N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\frac{\sqrt{2}}{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}}} \]

   10. lower-/.f64 N/A

       \[\leadsto \color{blue}{\frac{\cos th}{\frac{\sqrt{2}}{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}}} \]

   11. lower-/.f64 98.9

       \[\leadsto \frac{\cos th}{\color{blue}{\frac{\sqrt{2}}{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}}} \]

6. Applied rewrites 98.9%

   \[\leadsto \color{blue}{\frac{\cos th}{\frac{\sqrt{2}}{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}}} \]

7. Taylor expanded in a1 around 0

   \[\leadsto \frac{\cos th}{\frac{\sqrt{2}}{\color{blue}{{a2}^{2}}}} \]
8. Step-by-step derivation

   1. unpow2 N/A

      \[\leadsto \frac{\cos th}{\frac{\sqrt{2}}{\color{blue}{a2 \cdot a2}}} \]

   2. lower-*.f64 61.5

      \[\leadsto \frac{\cos th}{\frac{\sqrt{2}}{\color{blue}{a2 \cdot a2}}} \]

9. Applied rewrites 61.5%

   \[\leadsto \frac{\cos th}{\frac{\sqrt{2}}{\color{blue}{a2 \cdot a2}}} \]
10. Step-by-step derivation

    1. lift-cos.f64 N/A

       \[\leadsto \frac{\color{blue}{\cos th}}{\frac{\sqrt{2}}{a2 \cdot a2}} \]

    2. lift-sqrt.f64 N/A

       \[\leadsto \frac{\cos th}{\frac{\color{blue}{\sqrt{2}}}{a2 \cdot a2}} \]

    3. lift-*.f64 N/A

       \[\leadsto \frac{\cos th}{\frac{\sqrt{2}}{\color{blue}{a2 \cdot a2}}} \]

    4. associate-/r/ N/A

       \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right)} \]

    5. lift-*.f64 N/A

       \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a2 \cdot a2\right)} \]

    6. associate-*r* N/A

       \[\leadsto \color{blue}{\left(\frac{\cos th}{\sqrt{2}} \cdot a2\right) \cdot a2} \]

    7. lower-*.f64 N/A

       \[\leadsto \color{blue}{\left(\frac{\cos th}{\sqrt{2}} \cdot a2\right) \cdot a2} \]

    8. lower-*.f64 N/A

       \[\leadsto \color{blue}{\left(\frac{\cos th}{\sqrt{2}} \cdot a2\right)} \cdot a2 \]

    9. lower-/.f64 61.5

       \[\leadsto \left(\color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot a2\right) \cdot a2 \]

11. Applied rewrites 61.5%

    \[\leadsto \color{blue}{\left(\frac{\cos th}{\sqrt{2}} \cdot a2\right) \cdot a2} \]

12. Final simplification 61.5%

    \[\leadsto a2 \cdot \left(a2 \cdot \frac{\cos th}{\sqrt{2}}\right) \]
13. Add Preprocessing

Alternative 8: 57.9% accurate, 2.0× speedup

Math

\[\begin{array}{l} \\ \left(a2 \cdot a2\right) \cdot \frac{\cos th}{\sqrt{2}} \end{array} \]

FPCore

(FPCore (a1 a2 th) :precision binary64 (* (* a2 a2) (/ (cos th) (sqrt 2.0))))

C

double code(double a1, double a2, double th) {
	return (a2 * a2) * (cos(th) / sqrt(2.0));
}

Fortran

real(8) function code(a1, a2, th)
    real(8), intent (in) :: a1
    real(8), intent (in) :: a2
    real(8), intent (in) :: th
    code = (a2 * a2) * (cos(th) / sqrt(2.0d0))
end function

Java

public static double code(double a1, double a2, double th) {
	return (a2 * a2) * (Math.cos(th) / Math.sqrt(2.0));
}

Python

def code(a1, a2, th):
	return (a2 * a2) * (math.cos(th) / math.sqrt(2.0))

Julia

function code(a1, a2, th)
	return Float64(Float64(a2 * a2) * Float64(cos(th) / sqrt(2.0)))
end

MATLAB

function tmp = code(a1, a2, th)
	tmp = (a2 * a2) * (cos(th) / sqrt(2.0));
end

Wolfram

code[a1_, a2_, th_] := N[(N[(a2 * a2), $MachinePrecision] * N[(N[Cos[th], $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.6%

   \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift-cos.f64 N/A

      \[\leadsto \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   2. lift-sqrt.f64 N/A

      \[\leadsto \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   3. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   4. lift-*.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a1 \cdot a1\right)} + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   5. lift-cos.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   6. lift-sqrt.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

   7. lift-/.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

   8. lift-*.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a2 \cdot a2\right)} \]

   9. distribute-lft-out N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)} \]

   10. *-commutative N/A

       \[\leadsto \color{blue}{\left(a1 \cdot a1 + a2 \cdot a2\right) \cdot \frac{\cos th}{\sqrt{2}}} \]

   11. lower-*.f64 N/A

       \[\leadsto \color{blue}{\left(a1 \cdot a1 + a2 \cdot a2\right) \cdot \frac{\cos th}{\sqrt{2}}} \]

   12. lift-*.f64 N/A

       \[\leadsto \left(\color{blue}{a1 \cdot a1} + a2 \cdot a2\right) \cdot \frac{\cos th}{\sqrt{2}} \]

   13. lower-fma.f64 99.6

       \[\leadsto \color{blue}{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)} \cdot \frac{\cos th}{\sqrt{2}} \]

4. Applied rewrites 99.6%

   \[\leadsto \color{blue}{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right) \cdot \frac{\cos th}{\sqrt{2}}} \]

5. Taylor expanded in a1 around 0

   \[\leadsto \color{blue}{{a2}^{2}} \cdot \frac{\cos th}{\sqrt{2}} \]
6. Step-by-step derivation

   1. unpow2 N/A

      \[\leadsto \color{blue}{\left(a2 \cdot a2\right)} \cdot \frac{\cos th}{\sqrt{2}} \]

   2. lower-*.f64 61.5

      \[\leadsto \color{blue}{\left(a2 \cdot a2\right)} \cdot \frac{\cos th}{\sqrt{2}} \]

7. Applied rewrites 61.5%

   \[\leadsto \color{blue}{\left(a2 \cdot a2\right)} \cdot \frac{\cos th}{\sqrt{2}} \]
8. Add Preprocessing

Alternative 9: 65.9% accurate, 8.1× speedup

Math

\[\begin{array}{l} \\ \frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\sqrt{2}} \end{array} \]

FPCore

(FPCore (a1 a2 th) :precision binary64 (/ (fma a2 a2 (* a1 a1)) (sqrt 2.0)))

C

double code(double a1, double a2, double th) {
	return fma(a2, a2, (a1 * a1)) / sqrt(2.0);
}

Julia

function code(a1, a2, th)
	return Float64(fma(a2, a2, Float64(a1 * a1)) / sqrt(2.0))
end

Wolfram

code[a1_, a2_, th_] := N[(N[(a2 * a2 + N[(a1 * a1), $MachinePrecision]), $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.6%

   \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift-cos.f64 N/A

      \[\leadsto \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   2. lift-sqrt.f64 N/A

      \[\leadsto \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   3. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   4. lift-*.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a1 \cdot a1\right)} + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   5. lift-cos.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\color{blue}{\cos th}}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]

   6. lift-sqrt.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\color{blue}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

   7. lift-/.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a2 \cdot a2\right) \]

   8. lift-*.f64 N/A

      \[\leadsto \frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \color{blue}{\left(a2 \cdot a2\right)} \]

   9. distribute-lft-out N/A

      \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)} \]

   10. lift-/.f64 N/A

       \[\leadsto \color{blue}{\frac{\cos th}{\sqrt{2}}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

   11. div-inv N/A

       \[\leadsto \color{blue}{\left(\cos th \cdot \frac{1}{\sqrt{2}}\right)} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right) \]

   12. associate-*l* N/A

       \[\leadsto \color{blue}{\cos th \cdot \left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right)} \]

   13. *-commutative N/A

       \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

   14. lower-*.f64 N/A

       \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{2}} \cdot \left(a1 \cdot a1 + a2 \cdot a2\right)\right) \cdot \cos th} \]

4. Applied rewrites 99.6%

   \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a1, a1, a2 \cdot a2\right)}{\sqrt{2}} \cdot \cos th} \]

5. Taylor expanded in th around 0

   \[\leadsto \color{blue}{\frac{{a1}^{2} + {a2}^{2}}{\sqrt{2}}} \]
6. Step-by-step derivation

   1. *-lft-identity N/A

      \[\leadsto \frac{\color{blue}{1 \cdot {a1}^{2}} + {a2}^{2}}{\sqrt{2}} \]

   2. *-rgt-identity N/A

      \[\leadsto \frac{1 \cdot {a1}^{2} + \color{blue}{{a2}^{2} \cdot 1}}{\sqrt{2}} \]

   3. *-inverses N/A

      \[\leadsto \frac{1 \cdot {a1}^{2} + {a2}^{2} \cdot \color{blue}{\frac{{a1}^{2}}{{a1}^{2}}}}{\sqrt{2}} \]

   4. associate-/l* N/A

      \[\leadsto \frac{1 \cdot {a1}^{2} + \color{blue}{\frac{{a2}^{2} \cdot {a1}^{2}}{{a1}^{2}}}}{\sqrt{2}} \]

   5. associate-*l/ N/A

      \[\leadsto \frac{1 \cdot {a1}^{2} + \color{blue}{\frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2}}}{\sqrt{2}} \]

   6. distribute-rgt-in N/A

      \[\leadsto \frac{\color{blue}{{a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}}{\sqrt{2}} \]

   7. lower-/.f64 N/A

      \[\leadsto \color{blue}{\frac{{a1}^{2} \cdot \left(1 + \frac{{a2}^{2}}{{a1}^{2}}\right)}{\sqrt{2}}} \]

   8. distribute-rgt-in N/A

      \[\leadsto \frac{\color{blue}{1 \cdot {a1}^{2} + \frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2}}}{\sqrt{2}} \]

   9. *-lft-identity N/A

      \[\leadsto \frac{\color{blue}{{a1}^{2}} + \frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2}}{\sqrt{2}} \]

   10. +-commutative N/A

       \[\leadsto \frac{\color{blue}{\frac{{a2}^{2}}{{a1}^{2}} \cdot {a1}^{2} + {a1}^{2}}}{\sqrt{2}} \]

   11. associate-*l/ N/A

       \[\leadsto \frac{\color{blue}{\frac{{a2}^{2} \cdot {a1}^{2}}{{a1}^{2}}} + {a1}^{2}}{\sqrt{2}} \]

   12. associate-/l* N/A

       \[\leadsto \frac{\color{blue}{{a2}^{2} \cdot \frac{{a1}^{2}}{{a1}^{2}}} + {a1}^{2}}{\sqrt{2}} \]

   13. *-inverses N/A

       \[\leadsto \frac{{a2}^{2} \cdot \color{blue}{1} + {a1}^{2}}{\sqrt{2}} \]

   14. *-rgt-identity N/A

       \[\leadsto \frac{\color{blue}{{a2}^{2}} + {a1}^{2}}{\sqrt{2}} \]

   15. unpow2 N/A

       \[\leadsto \frac{\color{blue}{a2 \cdot a2} + {a1}^{2}}{\sqrt{2}} \]

   16. lower-fma.f64 N/A

       \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(a2, a2, {a1}^{2}\right)}}{\sqrt{2}} \]

   17. unpow2 N/A

       \[\leadsto \frac{\mathsf{fma}\left(a2, a2, \color{blue}{a1 \cdot a1}\right)}{\sqrt{2}} \]

   18. lower-*.f64 N/A

       \[\leadsto \frac{\mathsf{fma}\left(a2, a2, \color{blue}{a1 \cdot a1}\right)}{\sqrt{2}} \]

   19. lower-sqrt.f64 65.9

       \[\leadsto \frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\color{blue}{\sqrt{2}}} \]

7. Applied rewrites 65.9%

   \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a2, a2, a1 \cdot a1\right)}{\sqrt{2}}} \]
8. Add Preprocessing

Alternative 10: 40.2% accurate, 9.9× speedup

Math

\[\begin{array}{l} \\ \frac{a2 \cdot a2}{\sqrt{2}} \end{array} \]

FPCore

(FPCore (a1 a2 th) :precision binary64 (/ (* a2 a2) (sqrt 2.0)))

C

double code(double a1, double a2, double th) {
	return (a2 * a2) / sqrt(2.0);
}

Fortran

real(8) function code(a1, a2, th)
    real(8), intent (in) :: a1
    real(8), intent (in) :: a2
    real(8), intent (in) :: th
    code = (a2 * a2) / sqrt(2.0d0)
end function

Java

public static double code(double a1, double a2, double th) {
	return (a2 * a2) / Math.sqrt(2.0);
}

Python

def code(a1, a2, th):
	return (a2 * a2) / math.sqrt(2.0)

Julia

function code(a1, a2, th)
	return Float64(Float64(a2 * a2) / sqrt(2.0))
end

MATLAB

function tmp = code(a1, a2, th)
	tmp = (a2 * a2) / sqrt(2.0);
end

Wolfram

code[a1_, a2_, th_] := N[(N[(a2 * a2), $MachinePrecision] / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.6%

   \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
2. Add Preprocessing

3. Taylor expanded in th around 0

   \[\leadsto \color{blue}{\frac{{a1}^{2}}{\sqrt{2}} + \frac{{a2}^{2}}{\sqrt{2}}} \]
4. Step-by-step derivation

   1. unpow2 N/A

      \[\leadsto \frac{\color{blue}{a1 \cdot a1}}{\sqrt{2}} + \frac{{a2}^{2}}{\sqrt{2}} \]

   2. associate-/l* N/A

      \[\leadsto \color{blue}{a1 \cdot \frac{a1}{\sqrt{2}}} + \frac{{a2}^{2}}{\sqrt{2}} \]

   3. lower-fma.f64 N/A

      \[\leadsto \color{blue}{\mathsf{fma}\left(a1, \frac{a1}{\sqrt{2}}, \frac{{a2}^{2}}{\sqrt{2}}\right)} \]

   4. lower-/.f64 N/A

      \[\leadsto \mathsf{fma}\left(a1, \color{blue}{\frac{a1}{\sqrt{2}}}, \frac{{a2}^{2}}{\sqrt{2}}\right) \]

   5. lower-sqrt.f64 N/A

      \[\leadsto \mathsf{fma}\left(a1, \frac{a1}{\color{blue}{\sqrt{2}}}, \frac{{a2}^{2}}{\sqrt{2}}\right) \]

   6. lower-/.f64 N/A

      \[\leadsto \mathsf{fma}\left(a1, \frac{a1}{\sqrt{2}}, \color{blue}{\frac{{a2}^{2}}{\sqrt{2}}}\right) \]

   7. unpow2 N/A

      \[\leadsto \mathsf{fma}\left(a1, \frac{a1}{\sqrt{2}}, \frac{\color{blue}{a2 \cdot a2}}{\sqrt{2}}\right) \]

   8. lower-*.f64 N/A

      \[\leadsto \mathsf{fma}\left(a1, \frac{a1}{\sqrt{2}}, \frac{\color{blue}{a2 \cdot a2}}{\sqrt{2}}\right) \]

   9. lower-sqrt.f64 65.9

      \[\leadsto \mathsf{fma}\left(a1, \frac{a1}{\sqrt{2}}, \frac{a2 \cdot a2}{\color{blue}{\sqrt{2}}}\right) \]

5. Applied rewrites 65.9%

   \[\leadsto \color{blue}{\mathsf{fma}\left(a1, \frac{a1}{\sqrt{2}}, \frac{a2 \cdot a2}{\sqrt{2}}\right)} \]

6. Taylor expanded in a1 around 0

   \[\leadsto \color{blue}{\frac{{a2}^{2}}{\sqrt{2}}} \]
7. Step-by-step derivation

   1. lower-/.f64 N/A

      \[\leadsto \color{blue}{\frac{{a2}^{2}}{\sqrt{2}}} \]

   2. unpow2 N/A

      \[\leadsto \frac{\color{blue}{a2 \cdot a2}}{\sqrt{2}} \]

   3. lower-*.f64 N/A

      \[\leadsto \frac{\color{blue}{a2 \cdot a2}}{\sqrt{2}} \]

   4. lower-sqrt.f64 41.3

      \[\leadsto \frac{a2 \cdot a2}{\color{blue}{\sqrt{2}}} \]

8. Applied rewrites 41.3%

   \[\leadsto \color{blue}{\frac{a2 \cdot a2}{\sqrt{2}}} \]
9. Add Preprocessing

Alternative 11: 40.2% accurate, 9.9× speedup

Math

\[\begin{array}{l} \\ a2 \cdot \frac{a2}{\sqrt{2}} \end{array} \]

FPCore

(FPCore (a1 a2 th) :precision binary64 (* a2 (/ a2 (sqrt 2.0))))

C

double code(double a1, double a2, double th) {
	return a2 * (a2 / sqrt(2.0));
}

Fortran

real(8) function code(a1, a2, th)
    real(8), intent (in) :: a1
    real(8), intent (in) :: a2
    real(8), intent (in) :: th
    code = a2 * (a2 / sqrt(2.0d0))
end function

Java

public static double code(double a1, double a2, double th) {
	return a2 * (a2 / Math.sqrt(2.0));
}

Python

def code(a1, a2, th):
	return a2 * (a2 / math.sqrt(2.0))

Julia

function code(a1, a2, th)
	return Float64(a2 * Float64(a2 / sqrt(2.0)))
end

MATLAB

function tmp = code(a1, a2, th)
	tmp = a2 * (a2 / sqrt(2.0));
end

Wolfram

code[a1_, a2_, th_] := N[(a2 * N[(a2 / N[Sqrt[2.0], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.6%

   \[\frac{\cos th}{\sqrt{2}} \cdot \left(a1 \cdot a1\right) + \frac{\cos th}{\sqrt{2}} \cdot \left(a2 \cdot a2\right) \]
2. Add Preprocessing

3. Taylor expanded in th around 0

   \[\leadsto \color{blue}{\frac{{a1}^{2}}{\sqrt{2}} + \frac{{a2}^{2}}{\sqrt{2}}} \]
4. Step-by-step derivation

   1. unpow2 N/A

      \[\leadsto \frac{\color{blue}{a1 \cdot a1}}{\sqrt{2}} + \frac{{a2}^{2}}{\sqrt{2}} \]

   2. associate-/l* N/A

      \[\leadsto \color{blue}{a1 \cdot \frac{a1}{\sqrt{2}}} + \frac{{a2}^{2}}{\sqrt{2}} \]

   3. lower-fma.f64 N/A

      \[\leadsto \color{blue}{\mathsf{fma}\left(a1, \frac{a1}{\sqrt{2}}, \frac{{a2}^{2}}{\sqrt{2}}\right)} \]

   4. lower-/.f64 N/A

      \[\leadsto \mathsf{fma}\left(a1, \color{blue}{\frac{a1}{\sqrt{2}}}, \frac{{a2}^{2}}{\sqrt{2}}\right) \]

   5. lower-sqrt.f64 N/A

      \[\leadsto \mathsf{fma}\left(a1, \frac{a1}{\color{blue}{\sqrt{2}}}, \frac{{a2}^{2}}{\sqrt{2}}\right) \]

   6. lower-/.f64 N/A

      \[\leadsto \mathsf{fma}\left(a1, \frac{a1}{\sqrt{2}}, \color{blue}{\frac{{a2}^{2}}{\sqrt{2}}}\right) \]

   7. unpow2 N/A

      \[\leadsto \mathsf{fma}\left(a1, \frac{a1}{\sqrt{2}}, \frac{\color{blue}{a2 \cdot a2}}{\sqrt{2}}\right) \]

   8. lower-*.f64 N/A

      \[\leadsto \mathsf{fma}\left(a1, \frac{a1}{\sqrt{2}}, \frac{\color{blue}{a2 \cdot a2}}{\sqrt{2}}\right) \]

   9. lower-sqrt.f64 65.9

      \[\leadsto \mathsf{fma}\left(a1, \frac{a1}{\sqrt{2}}, \frac{a2 \cdot a2}{\color{blue}{\sqrt{2}}}\right) \]

5. Applied rewrites 65.9%

   \[\leadsto \color{blue}{\mathsf{fma}\left(a1, \frac{a1}{\sqrt{2}}, \frac{a2 \cdot a2}{\sqrt{2}}\right)} \]
6. Step-by-step derivation

   1. lift-sqrt.f64 N/A

      \[\leadsto a1 \cdot \frac{a1}{\color{blue}{\sqrt{2}}} + \frac{a2 \cdot a2}{\sqrt{2}} \]

   2. lift-/.f64 N/A

      \[\leadsto a1 \cdot \color{blue}{\frac{a1}{\sqrt{2}}} + \frac{a2 \cdot a2}{\sqrt{2}} \]

   3. lift-*.f64 N/A

      \[\leadsto a1 \cdot \frac{a1}{\sqrt{2}} + \frac{\color{blue}{a2 \cdot a2}}{\sqrt{2}} \]

   4. lift-sqrt.f64 N/A

      \[\leadsto a1 \cdot \frac{a1}{\sqrt{2}} + \frac{a2 \cdot a2}{\color{blue}{\sqrt{2}}} \]

   5. lift-/.f64 N/A

      \[\leadsto a1 \cdot \frac{a1}{\sqrt{2}} + \color{blue}{\frac{a2 \cdot a2}{\sqrt{2}}} \]

   6. +-commutative N/A

      \[\leadsto \color{blue}{\frac{a2 \cdot a2}{\sqrt{2}} + a1 \cdot \frac{a1}{\sqrt{2}}} \]

   7. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{a2 \cdot a2}{\sqrt{2}}} + a1 \cdot \frac{a1}{\sqrt{2}} \]

   8. lift-/.f64 N/A

      \[\leadsto \frac{a2 \cdot a2}{\sqrt{2}} + a1 \cdot \color{blue}{\frac{a1}{\sqrt{2}}} \]

   9. associate-*r/ N/A

      \[\leadsto \frac{a2 \cdot a2}{\sqrt{2}} + \color{blue}{\frac{a1 \cdot a1}{\sqrt{2}}} \]

   10. lift-*.f64 N/A

       \[\leadsto \frac{a2 \cdot a2}{\sqrt{2}} + \frac{\color{blue}{a1 \cdot a1}}{\sqrt{2}} \]

   11. clear-num N/A

       \[\leadsto \frac{a2 \cdot a2}{\sqrt{2}} + \color{blue}{\frac{1}{\frac{\sqrt{2}}{a1 \cdot a1}}} \]

   12. frac-add N/A

       \[\leadsto \color{blue}{\frac{\left(a2 \cdot a2\right) \cdot \frac{\sqrt{2}}{a1 \cdot a1} + \sqrt{2} \cdot 1}{\sqrt{2} \cdot \frac{\sqrt{2}}{a1 \cdot a1}}} \]

   13. lower-/.f64 N/A

       \[\leadsto \color{blue}{\frac{\left(a2 \cdot a2\right) \cdot \frac{\sqrt{2}}{a1 \cdot a1} + \sqrt{2} \cdot 1}{\sqrt{2} \cdot \frac{\sqrt{2}}{a1 \cdot a1}}} \]

   14. lower-fma.f64 N/A

       \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(a2 \cdot a2, \frac{\sqrt{2}}{a1 \cdot a1}, \sqrt{2} \cdot 1\right)}}{\sqrt{2} \cdot \frac{\sqrt{2}}{a1 \cdot a1}} \]

   15. lower-/.f64 N/A

       \[\leadsto \frac{\mathsf{fma}\left(a2 \cdot a2, \color{blue}{\frac{\sqrt{2}}{a1 \cdot a1}}, \sqrt{2} \cdot 1\right)}{\sqrt{2} \cdot \frac{\sqrt{2}}{a1 \cdot a1}} \]

   16. lower-*.f64 N/A

       \[\leadsto \frac{\mathsf{fma}\left(a2 \cdot a2, \frac{\sqrt{2}}{a1 \cdot a1}, \color{blue}{\sqrt{2} \cdot 1}\right)}{\sqrt{2} \cdot \frac{\sqrt{2}}{a1 \cdot a1}} \]

   17. lower-*.f64 N/A

       \[\leadsto \frac{\mathsf{fma}\left(a2 \cdot a2, \frac{\sqrt{2}}{a1 \cdot a1}, \sqrt{2} \cdot 1\right)}{\color{blue}{\sqrt{2} \cdot \frac{\sqrt{2}}{a1 \cdot a1}}} \]

7. Applied rewrites 41.6%

   \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(a2 \cdot a2, \frac{\sqrt{2}}{a1 \cdot a1}, \sqrt{2} \cdot 1\right)}{\sqrt{2} \cdot \frac{\sqrt{2}}{a1 \cdot a1}}} \]

8. Taylor expanded in a2 around inf

   \[\leadsto \color{blue}{\frac{{a2}^{2}}{\sqrt{2}}} \]
9. Step-by-step derivation

   1. unpow2 N/A

      \[\leadsto \frac{\color{blue}{a2 \cdot a2}}{\sqrt{2}} \]

   2. associate-/l* N/A

      \[\leadsto \color{blue}{a2 \cdot \frac{a2}{\sqrt{2}}} \]

   3. lower-*.f64 N/A

      \[\leadsto \color{blue}{a2 \cdot \frac{a2}{\sqrt{2}}} \]

   4. lower-/.f64 N/A

      \[\leadsto a2 \cdot \color{blue}{\frac{a2}{\sqrt{2}}} \]

   5. lower-sqrt.f64 41.2

      \[\leadsto a2 \cdot \frac{a2}{\color{blue}{\sqrt{2}}} \]

10. Applied rewrites 41.2%

    \[\leadsto \color{blue}{a2 \cdot \frac{a2}{\sqrt{2}}} \]
11. Add Preprocessing

Reproduce

herbie shell --seed 2024221 
(FPCore (a1 a2 th)
  :name "Migdal et al, Equation (64)"
  :precision binary64
  (+ (* (/ (cos th) (sqrt 2.0)) (* a1 a1)) (* (/ (cos th) (sqrt 2.0)) (* a2 a2))))