(/ 1 (* PI z0))

Percentage Accurate: 99.4% → 99.6%

Time: 1.4s

Alternatives: 4

Speedup: 1.0×

Specification

Math

\[\frac{1}{\pi \cdot z0} \]

FPCore

(FPCore (z0)
  :precision binary64
  (/ 1.0 (* PI z0)))

C

double code(double z0) {
	return 1.0 / (((double) M_PI) * z0);
}

Java

public static double code(double z0) {
	return 1.0 / (Math.PI * z0);
}

Python

def code(z0):
	return 1.0 / (math.pi * z0)

Julia

function code(z0)
	return Float64(1.0 / Float64(pi * z0))
end

MATLAB

function tmp = code(z0)
	tmp = 1.0 / (pi * z0);
end

Wolfram

code[z0_] := N[(1.0 / N[(Pi * z0), $MachinePrecision]), $MachinePrecision]

Initial Program: 99.4% accurate, 1.0× speedup

Math

\[\frac{1}{\pi \cdot z0} \]

FPCore

(FPCore (z0)
  :precision binary64
  (/ 1.0 (* PI z0)))

C

double code(double z0) {
	return 1.0 / (((double) M_PI) * z0);
}

Java

public static double code(double z0) {
	return 1.0 / (Math.PI * z0);
}

Python

def code(z0):
	return 1.0 / (math.pi * z0)

Julia

function code(z0)
	return Float64(1.0 / Float64(pi * z0))
end

MATLAB

function tmp = code(z0)
	tmp = 1.0 / (pi * z0);
end

Wolfram

code[z0_] := N[(1.0 / N[(Pi * z0), $MachinePrecision]), $MachinePrecision]

Alternative 1: 99.6% accurate, 0.5× speedup

Math

\[\frac{\frac{1}{\pi \cdot \pi}}{z0} \cdot \pi \]

FPCore

(FPCore (z0)
  :precision binary64
  (* (/ (/ 1.0 (* PI PI)) z0) PI))

C

double code(double z0) {
	return ((1.0 / (((double) M_PI) * ((double) M_PI))) / z0) * ((double) M_PI);
}

Java

public static double code(double z0) {
	return ((1.0 / (Math.PI * Math.PI)) / z0) * Math.PI;
}

Python

def code(z0):
	return ((1.0 / (math.pi * math.pi)) / z0) * math.pi

Julia

function code(z0)
	return Float64(Float64(Float64(1.0 / Float64(pi * pi)) / z0) * pi)
end

MATLAB

function tmp = code(z0)
	tmp = ((1.0 / (pi * pi)) / z0) * pi;
end

Wolfram

code[z0_] := N[(N[(N[(1.0 / N[(Pi * Pi), $MachinePrecision]), $MachinePrecision] / z0), $MachinePrecision] * Pi), $MachinePrecision]

Derivation

1. Initial program 99.4%

   \[\frac{1}{\pi \cdot z0} \]
2. Step-by-step derivation

   1. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{1}{\pi \cdot z0}} \]

   2. lift-*.f64 N/A

      \[\leadsto \frac{1}{\color{blue}{\pi \cdot z0}} \]

   3. *-commutative N/A

      \[\leadsto \frac{1}{\color{blue}{z0 \cdot \pi}} \]

   4. associate-/r* N/A

      \[\leadsto \color{blue}{\frac{\frac{1}{z0}}{\pi}} \]

   5. lower-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\frac{1}{z0}}{\pi}} \]

   6. lower-/.f64 99.5%

      \[\leadsto \frac{\color{blue}{\frac{1}{z0}}}{\pi} \]

3. Applied rewrites 99.5%

   \[\leadsto \color{blue}{\frac{\frac{1}{z0}}{\pi}} \]

5. Applied rewrites 99.1%

   \[\leadsto \color{blue}{\frac{1}{\left(\pi \cdot z0\right) \cdot \pi} \cdot \pi} \]
6. Step-by-step derivation

   1. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{1}{\left(\pi \cdot z0\right) \cdot \pi}} \cdot \pi \]

   2. lift-*.f64 N/A

      \[\leadsto \frac{1}{\color{blue}{\left(\pi \cdot z0\right) \cdot \pi}} \cdot \pi \]

   3. *-commutative N/A

      \[\leadsto \frac{1}{\color{blue}{\pi \cdot \left(\pi \cdot z0\right)}} \cdot \pi \]

   4. associate-/r* N/A

      \[\leadsto \color{blue}{\frac{\frac{1}{\pi}}{\pi \cdot z0}} \cdot \pi \]

   5. lower-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\frac{1}{\pi}}{\pi \cdot z0}} \cdot \pi \]

   6. lower-/.f64 99.2%

      \[\leadsto \frac{\color{blue}{\frac{1}{\pi}}}{\pi \cdot z0} \cdot \pi \]

7. Applied rewrites 99.2%

   \[\leadsto \color{blue}{\frac{\frac{1}{\pi}}{\pi \cdot z0}} \cdot \pi \]
8. Step-by-step derivation

   1. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\frac{1}{\pi}}{\pi \cdot z0}} \cdot \pi \]

   2. mult-flip N/A

      \[\leadsto \color{blue}{\left(\frac{1}{\pi} \cdot \frac{1}{\pi \cdot z0}\right)} \cdot \pi \]

   3. lift-/.f64 N/A

      \[\leadsto \left(\color{blue}{\frac{1}{\pi}} \cdot \frac{1}{\pi \cdot z0}\right) \cdot \pi \]

   4. frac-times N/A

      \[\leadsto \color{blue}{\frac{1 \cdot 1}{\pi \cdot \left(\pi \cdot z0\right)}} \cdot \pi \]

   5. lift-*.f64 N/A

      \[\leadsto \frac{1 \cdot 1}{\pi \cdot \color{blue}{\left(\pi \cdot z0\right)}} \cdot \pi \]

   6. associate-*r* N/A

      \[\leadsto \frac{1 \cdot 1}{\color{blue}{\left(\pi \cdot \pi\right) \cdot z0}} \cdot \pi \]

   7. lift-*.f64 N/A

      \[\leadsto \frac{1 \cdot 1}{\color{blue}{\left(\pi \cdot \pi\right)} \cdot z0} \cdot \pi \]

   8. frac-times N/A

      \[\leadsto \color{blue}{\left(\frac{1}{\pi \cdot \pi} \cdot \frac{1}{z0}\right)} \cdot \pi \]

   9. mult-flip N/A

      \[\leadsto \color{blue}{\frac{\frac{1}{\pi \cdot \pi}}{z0}} \cdot \pi \]

   10. lower-/.f64 N/A

       \[\leadsto \color{blue}{\frac{\frac{1}{\pi \cdot \pi}}{z0}} \cdot \pi \]

   11. lower-/.f64 99.6%

       \[\leadsto \frac{\color{blue}{\frac{1}{\pi \cdot \pi}}}{z0} \cdot \pi \]

9. Applied rewrites 99.6%

   \[\leadsto \color{blue}{\frac{\frac{1}{\pi \cdot \pi}}{z0}} \cdot \pi \]
10. Add Preprocessing

Alternative 2: 99.5% accurate, 0.7× speedup

Math

\[\frac{\frac{\pi}{z0}}{9.869604401089358} \]

FPCore

(FPCore (z0)
  :precision binary64
  (/ (/ PI z0) 9.869604401089358))

C

double code(double z0) {
	return (((double) M_PI) / z0) / 9.869604401089358;
}

Java

public static double code(double z0) {
	return (Math.PI / z0) / 9.869604401089358;
}

Python

def code(z0):
	return (math.pi / z0) / 9.869604401089358

Julia

function code(z0)
	return Float64(Float64(pi / z0) / 9.869604401089358)
end

MATLAB

function tmp = code(z0)
	tmp = (pi / z0) / 9.869604401089358;
end

Wolfram

code[z0_] := N[(N[(Pi / z0), $MachinePrecision] / 9.869604401089358), $MachinePrecision]

Derivation

1. Initial program 99.4%

   \[\frac{1}{\pi \cdot z0} \]
2. Step-by-step derivation

   1. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{1}{\pi \cdot z0}} \]

   2. lift-*.f64 N/A

      \[\leadsto \frac{1}{\color{blue}{\pi \cdot z0}} \]

   3. *-commutative N/A

      \[\leadsto \frac{1}{\color{blue}{z0 \cdot \pi}} \]

   4. associate-/r* N/A

      \[\leadsto \color{blue}{\frac{\frac{1}{z0}}{\pi}} \]

   5. lower-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\frac{1}{z0}}{\pi}} \]

   6. lower-/.f64 99.5%

      \[\leadsto \frac{\color{blue}{\frac{1}{z0}}}{\pi} \]

3. Applied rewrites 99.5%

   \[\leadsto \color{blue}{\frac{\frac{1}{z0}}{\pi}} \]

5. Applied rewrites 99.4%

   \[\leadsto \color{blue}{\frac{\frac{1}{z0} \cdot \pi}{\pi \cdot \pi}} \]
6. Step-by-step derivation

   1. lift-*.f64 N/A

      \[\leadsto \frac{\color{blue}{\frac{1}{z0} \cdot \pi}}{\pi \cdot \pi} \]

   2. *-commutative N/A

      \[\leadsto \frac{\color{blue}{\pi \cdot \frac{1}{z0}}}{\pi \cdot \pi} \]

   3. lift-/.f64 N/A

      \[\leadsto \frac{\pi \cdot \color{blue}{\frac{1}{z0}}}{\pi \cdot \pi} \]

   4. mult-flip-rev N/A

      \[\leadsto \frac{\color{blue}{\frac{\pi}{z0}}}{\pi \cdot \pi} \]

   5. lower-/.f64 99.5%

      \[\leadsto \frac{\color{blue}{\frac{\pi}{z0}}}{\pi \cdot \pi} \]

7. Applied rewrites 99.5%

   \[\leadsto \frac{\color{blue}{\frac{\pi}{z0}}}{\pi \cdot \pi} \]

8. Evaluated real constant 99.5%

   \[\leadsto \frac{\frac{\pi}{z0}}{\color{blue}{9.869604401089358}} \]
9. Add Preprocessing

Alternative 3: 99.4% accurate, 1.4× speedup

Math

\[\frac{0.3183098861837907}{z0} \]

FPCore

(FPCore (z0)
  :precision binary64
  (/ 0.3183098861837907 z0))

C

double code(double z0) {
	return 0.3183098861837907 / z0;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(z0)
use fmin_fmax_functions
    real(8), intent (in) :: z0
    code = 0.3183098861837907d0 / z0
end function

Java

public static double code(double z0) {
	return 0.3183098861837907 / z0;
}

Python

def code(z0):
	return 0.3183098861837907 / z0

Julia

function code(z0)
	return Float64(0.3183098861837907 / z0)
end

MATLAB

function tmp = code(z0)
	tmp = 0.3183098861837907 / z0;
end

Wolfram

code[z0_] := N[(0.3183098861837907 / z0), $MachinePrecision]

Derivation

1. Initial program 99.4%

   \[\frac{1}{\pi \cdot z0} \]
2. Step-by-step derivation

   1. lift-/.f64 N/A

      \[\leadsto \color{blue}{\frac{1}{\pi \cdot z0}} \]

   2. lift-*.f64 N/A

      \[\leadsto \frac{1}{\color{blue}{\pi \cdot z0}} \]

   3. associate-/r* N/A

      \[\leadsto \color{blue}{\frac{\frac{1}{\pi}}{z0}} \]

   4. lower-/.f64 N/A

      \[\leadsto \color{blue}{\frac{\frac{1}{\pi}}{z0}} \]

   5. lower-/.f64 99.4%

      \[\leadsto \frac{\color{blue}{\frac{1}{\pi}}}{z0} \]

3. Applied rewrites 99.4%

   \[\leadsto \color{blue}{\frac{\frac{1}{\pi}}{z0}} \]

4. Evaluated real constant 99.4%

   \[\leadsto \frac{\color{blue}{0.3183098861837907}}{z0} \]
5. Add Preprocessing

Reproduce

herbie shell --seed 2025250 
(FPCore (z0)
  :name "(/ 1 (* PI z0))"
  :precision binary64
  (/ 1.0 (* PI z0)))