2tan (problem 3.3.2)

Percentage Accurate: 62.5% → 99.6%

Time: 8.5s

Alternatives: 16

Speedup: 207.0×

Specification

\[\left(\left(-10000 \leq x \land x \leq 10000\right) \land 10^{-16} \cdot \left|x\right| < \varepsilon\right) \land \varepsilon < \left|x\right|\]

Math

\[\begin{array}{l} \\ \tan \left(x + \varepsilon\right) - \tan x \end{array} \]

FPCore

(FPCore (x eps) :precision binary64 (- (tan (+ x eps)) (tan x)))

C

double code(double x, double eps) {
	return tan((x + eps)) - tan(x);
}

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(x, eps)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: eps
    code = tan((x + eps)) - tan(x)
end function

Java

public static double code(double x, double eps) {
	return Math.tan((x + eps)) - Math.tan(x);
}

Python

def code(x, eps):
	return math.tan((x + eps)) - math.tan(x)

Julia

function code(x, eps)
	return Float64(tan(Float64(x + eps)) - tan(x))
end

MATLAB

function tmp = code(x, eps)
	tmp = tan((x + eps)) - tan(x);
end

Wolfram

code[x_, eps_] := N[(N[Tan[N[(x + eps), $MachinePrecision]], $MachinePrecision] - N[Tan[x], $MachinePrecision]), $MachinePrecision]

Initial Program: 62.5% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \tan \left(x + \varepsilon\right) - \tan x \end{array} \]

FPCore

(FPCore (x eps) :precision binary64 (- (tan (+ x eps)) (tan x)))

C

double code(double x, double eps) {
	return tan((x + eps)) - tan(x);
}

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(x, eps)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: eps
    code = tan((x + eps)) - tan(x)
end function

Java

public static double code(double x, double eps) {
	return Math.tan((x + eps)) - Math.tan(x);
}

Python

def code(x, eps):
	return math.tan((x + eps)) - math.tan(x)

Julia

function code(x, eps)
	return Float64(tan(Float64(x + eps)) - tan(x))
end

MATLAB

function tmp = code(x, eps)
	tmp = tan((x + eps)) - tan(x);
end

Wolfram

code[x_, eps_] := N[(N[Tan[N[(x + eps), $MachinePrecision]], $MachinePrecision] - N[Tan[x], $MachinePrecision]), $MachinePrecision]

Alternative 1: 99.6% accurate, 0.1× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := {\tan x}^{2}\\ t_1 := -t\_0\\ t_2 := 1 - t\_1\\ t_3 := \mathsf{fma}\left(\frac{t\_2 \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(t\_2, -0.5, t\_0 \cdot 0.16666666666666666\right)\right) + 0.16666666666666666\\ t_4 := t\_2 \cdot \sin x\\ t_5 := \frac{t\_4}{\cos x}\\ \left(\mathsf{fma}\left(\mathsf{fma}\left(\left(-\varepsilon\right) \cdot \mathsf{fma}\left(t\_5, -0.5, \frac{\mathsf{fma}\left(t\_3, \sin x, 0.16666666666666666 \cdot t\_4\right)}{\cos x}\right) - t\_3, \varepsilon, 1 \cdot t\_5\right), \varepsilon, 1\right) - t\_1\right) \cdot \varepsilon \end{array} \end{array} \]

FPCore

(FPCore (x eps)
 :precision binary64
 (let* ((t_0 (pow (tan x) 2.0))
        (t_1 (- t_0))
        (t_2 (- 1.0 t_1))
        (t_3
         (+
          (fma
           (/ (* t_2 (pow (sin x) 2.0)) (pow (cos x) 2.0))
           -1.0
           (fma t_2 -0.5 (* t_0 0.16666666666666666)))
          0.16666666666666666))
        (t_4 (* t_2 (sin x)))
        (t_5 (/ t_4 (cos x))))
   (*
    (-
     (fma
      (fma
       (-
        (*
         (- eps)
         (fma
          t_5
          -0.5
          (/ (fma t_3 (sin x) (* 0.16666666666666666 t_4)) (cos x))))
        t_3)
       eps
       (* 1.0 t_5))
      eps
      1.0)
     t_1)
    eps)))

C

double code(double x, double eps) {
	double t_0 = pow(tan(x), 2.0);
	double t_1 = -t_0;
	double t_2 = 1.0 - t_1;
	double t_3 = fma(((t_2 * pow(sin(x), 2.0)) / pow(cos(x), 2.0)), -1.0, fma(t_2, -0.5, (t_0 * 0.16666666666666666))) + 0.16666666666666666;
	double t_4 = t_2 * sin(x);
	double t_5 = t_4 / cos(x);
	return (fma(fma(((-eps * fma(t_5, -0.5, (fma(t_3, sin(x), (0.16666666666666666 * t_4)) / cos(x)))) - t_3), eps, (1.0 * t_5)), eps, 1.0) - t_1) * eps;
}

Julia

function code(x, eps)
	t_0 = tan(x) ^ 2.0
	t_1 = Float64(-t_0)
	t_2 = Float64(1.0 - t_1)
	t_3 = Float64(fma(Float64(Float64(t_2 * (sin(x) ^ 2.0)) / (cos(x) ^ 2.0)), -1.0, fma(t_2, -0.5, Float64(t_0 * 0.16666666666666666))) + 0.16666666666666666)
	t_4 = Float64(t_2 * sin(x))
	t_5 = Float64(t_4 / cos(x))
	return Float64(Float64(fma(fma(Float64(Float64(Float64(-eps) * fma(t_5, -0.5, Float64(fma(t_3, sin(x), Float64(0.16666666666666666 * t_4)) / cos(x)))) - t_3), eps, Float64(1.0 * t_5)), eps, 1.0) - t_1) * eps)
end

Wolfram

code[x_, eps_] := Block[{t$95$0 = N[Power[N[Tan[x], $MachinePrecision], 2.0], $MachinePrecision]}, Block[{t$95$1 = (-t$95$0)}, Block[{t$95$2 = N[(1.0 - t$95$1), $MachinePrecision]}, Block[{t$95$3 = N[(N[(N[(N[(t$95$2 * N[Power[N[Sin[x], $MachinePrecision], 2.0], $MachinePrecision]), $MachinePrecision] / N[Power[N[Cos[x], $MachinePrecision], 2.0], $MachinePrecision]), $MachinePrecision] * -1.0 + N[(t$95$2 * -0.5 + N[(t$95$0 * 0.16666666666666666), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] + 0.16666666666666666), $MachinePrecision]}, Block[{t$95$4 = N[(t$95$2 * N[Sin[x], $MachinePrecision]), $MachinePrecision]}, Block[{t$95$5 = N[(t$95$4 / N[Cos[x], $MachinePrecision]), $MachinePrecision]}, N[(N[(N[(N[(N[(N[((-eps) * N[(t$95$5 * -0.5 + N[(N[(t$95$3 * N[Sin[x], $MachinePrecision] + N[(0.16666666666666666 * t$95$4), $MachinePrecision]), $MachinePrecision] / N[Cos[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - t$95$3), $MachinePrecision] * eps + N[(1.0 * t$95$5), $MachinePrecision]), $MachinePrecision] * eps + 1.0), $MachinePrecision] - t$95$1), $MachinePrecision] * eps), $MachinePrecision]]]]]]]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(\left(1 + \varepsilon \cdot \left(\varepsilon \cdot \left(-1 \cdot \left(\varepsilon \cdot \left(\frac{-1}{2} \cdot \frac{\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{\cos x} + \left(\frac{1}{6} \cdot \frac{\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{\cos x} + \frac{\sin x \cdot \left(\frac{1}{6} + \left(-1 \cdot \frac{{\sin x}^{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{{\cos x}^{2}} + \left(\frac{-1}{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) + \frac{1}{6} \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)\right)}{\cos x}\right)\right)\right) - \left(\frac{1}{6} + \left(-1 \cdot \frac{{\sin x}^{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{{\cos x}^{2}} + \left(\frac{-1}{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) + \frac{1}{6} \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)\right)\right) - -1 \cdot \frac{\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{\cos x}\right)\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]

4. Applied rewrites 99.6%

   \[\leadsto \color{blue}{\left(\mathsf{fma}\left(\mathsf{fma}\left(\left(-\varepsilon\right) \cdot \mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}, -0.5, \frac{\mathsf{fma}\left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), -0.5, {\tan x}^{2} \cdot 0.16666666666666666\right)\right) + 0.16666666666666666, \sin x, 0.16666666666666666 \cdot \left(\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x\right)\right)}{\cos x}\right) - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), -0.5, {\tan x}^{2} \cdot 0.16666666666666666\right)\right) + 0.16666666666666666\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]
5. Add Preprocessing

Alternative 2: 99.5% accurate, 0.1× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := {\tan x}^{2}\\ t_1 := 1 - \left(-t\_0\right)\\ \mathsf{fma}\left(\mathsf{fma}\left(\left(\left(\left(\varepsilon \cdot x\right) \cdot 0.6666666666666666 - \left(-\frac{{\sin x}^{2}}{{\cos x}^{2}} \cdot t\_1\right)\right) - \mathsf{fma}\left(-0.5, t\_1, 0.16666666666666666 \cdot t\_0\right)\right) - 0.16666666666666666, \varepsilon, t\_1 \cdot \tan x\right), \varepsilon, t\_1\right) \cdot \varepsilon \end{array} \end{array} \]

FPCore

(FPCore (x eps)
 :precision binary64
 (let* ((t_0 (pow (tan x) 2.0)) (t_1 (- 1.0 (- t_0))))
   (*
    (fma
     (fma
      (-
       (-
        (-
         (* (* eps x) 0.6666666666666666)
         (- (* (/ (pow (sin x) 2.0) (pow (cos x) 2.0)) t_1)))
        (fma -0.5 t_1 (* 0.16666666666666666 t_0)))
       0.16666666666666666)
      eps
      (* t_1 (tan x)))
     eps
     t_1)
    eps)))

C

double code(double x, double eps) {
	double t_0 = pow(tan(x), 2.0);
	double t_1 = 1.0 - -t_0;
	return fma(fma((((((eps * x) * 0.6666666666666666) - -((pow(sin(x), 2.0) / pow(cos(x), 2.0)) * t_1)) - fma(-0.5, t_1, (0.16666666666666666 * t_0))) - 0.16666666666666666), eps, (t_1 * tan(x))), eps, t_1) * eps;
}

Julia

function code(x, eps)
	t_0 = tan(x) ^ 2.0
	t_1 = Float64(1.0 - Float64(-t_0))
	return Float64(fma(fma(Float64(Float64(Float64(Float64(Float64(eps * x) * 0.6666666666666666) - Float64(-Float64(Float64((sin(x) ^ 2.0) / (cos(x) ^ 2.0)) * t_1))) - fma(-0.5, t_1, Float64(0.16666666666666666 * t_0))) - 0.16666666666666666), eps, Float64(t_1 * tan(x))), eps, t_1) * eps)
end

Wolfram

code[x_, eps_] := Block[{t$95$0 = N[Power[N[Tan[x], $MachinePrecision], 2.0], $MachinePrecision]}, Block[{t$95$1 = N[(1.0 - (-t$95$0)), $MachinePrecision]}, N[(N[(N[(N[(N[(N[(N[(N[(eps * x), $MachinePrecision] * 0.6666666666666666), $MachinePrecision] - (-N[(N[(N[Power[N[Sin[x], $MachinePrecision], 2.0], $MachinePrecision] / N[Power[N[Cos[x], $MachinePrecision], 2.0], $MachinePrecision]), $MachinePrecision] * t$95$1), $MachinePrecision])), $MachinePrecision] - N[(-0.5 * t$95$1 + N[(0.16666666666666666 * t$95$0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - 0.16666666666666666), $MachinePrecision] * eps + N[(t$95$1 * N[Tan[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision] * eps + t$95$1), $MachinePrecision] * eps), $MachinePrecision]]]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(\left(1 + \varepsilon \cdot \left(\varepsilon \cdot \left(-1 \cdot \left(\varepsilon \cdot \left(\frac{-1}{2} \cdot \frac{\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{\cos x} + \left(\frac{1}{6} \cdot \frac{\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{\cos x} + \frac{\sin x \cdot \left(\frac{1}{6} + \left(-1 \cdot \frac{{\sin x}^{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{{\cos x}^{2}} + \left(\frac{-1}{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) + \frac{1}{6} \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)\right)}{\cos x}\right)\right)\right) - \left(\frac{1}{6} + \left(-1 \cdot \frac{{\sin x}^{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{{\cos x}^{2}} + \left(\frac{-1}{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) + \frac{1}{6} \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)\right)\right) - -1 \cdot \frac{\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{\cos x}\right)\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]

4. Applied rewrites 99.6%

   \[\leadsto \color{blue}{\left(\mathsf{fma}\left(\mathsf{fma}\left(\left(-\varepsilon\right) \cdot \mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}, -0.5, \frac{\mathsf{fma}\left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), -0.5, {\tan x}^{2} \cdot 0.16666666666666666\right)\right) + 0.16666666666666666, \sin x, 0.16666666666666666 \cdot \left(\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x\right)\right)}{\cos x}\right) - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), -0.5, {\tan x}^{2} \cdot 0.16666666666666666\right)\right) + 0.16666666666666666\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

5. Taylor expanded in x around 0

   \[\leadsto \left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{2}{3} \cdot \left(\varepsilon \cdot x\right) - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), \frac{-1}{2}, {\tan x}^{2} \cdot \frac{1}{6}\right)\right) + \frac{1}{6}\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]
6. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\mathsf{fma}\left(\left(\varepsilon \cdot x\right) \cdot \frac{2}{3} - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), \frac{-1}{2}, {\tan x}^{2} \cdot \frac{1}{6}\right)\right) + \frac{1}{6}\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   2. lower-*.f64 N/A

      \[\leadsto \left(\mathsf{fma}\left(\mathsf{fma}\left(\left(\varepsilon \cdot x\right) \cdot \frac{2}{3} - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), \frac{-1}{2}, {\tan x}^{2} \cdot \frac{1}{6}\right)\right) + \frac{1}{6}\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   3. lower-*.f64 99.5

      \[\leadsto \left(\mathsf{fma}\left(\mathsf{fma}\left(\left(\varepsilon \cdot x\right) \cdot 0.6666666666666666 - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), -0.5, {\tan x}^{2} \cdot 0.16666666666666666\right)\right) + 0.16666666666666666\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

7. Applied rewrites 99.5%

   \[\leadsto \left(\mathsf{fma}\left(\mathsf{fma}\left(\left(\varepsilon \cdot x\right) \cdot 0.6666666666666666 - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), -0.5, {\tan x}^{2} \cdot 0.16666666666666666\right)\right) + 0.16666666666666666\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

9. Applied rewrites 99.5%

   \[\leadsto \color{blue}{\mathsf{fma}\left(\mathsf{fma}\left(\left(\left(\varepsilon \cdot x\right) \cdot 0.6666666666666666 - \mathsf{fma}\left(-1, \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}, \mathsf{fma}\left(-0.5, 1 - \left(-{\tan x}^{2}\right), 0.16666666666666666 \cdot {\tan x}^{2}\right)\right)\right) - 0.16666666666666666, \varepsilon, \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \tan x\right), \varepsilon, 1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

11. Applied rewrites 99.5%

    \[\leadsto \mathsf{fma}\left(\mathsf{fma}\left(\left(\left(\left(\varepsilon \cdot x\right) \cdot 0.6666666666666666 - \left(-\frac{{\sin x}^{2}}{{\cos x}^{2}} \cdot \left(1 - \left(-{\tan x}^{2}\right)\right)\right)\right) - \mathsf{fma}\left(-0.5, 1 - \left(-{\tan x}^{2}\right), 0.16666666666666666 \cdot {\tan x}^{2}\right)\right) - 0.16666666666666666, \varepsilon, \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \tan x\right), \varepsilon, 1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]
12. Add Preprocessing

Alternative 3: 99.3% accurate, 0.4× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := 1 - \left(-{\tan x}^{2}\right)\\ \mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(1.3333333333333333, x, 0.6666666666666666 \cdot \varepsilon\right), x, 0.3333333333333333\right), \varepsilon, t\_0 \cdot \tan x\right), \varepsilon, t\_0\right) \cdot \varepsilon \end{array} \end{array} \]

FPCore

(FPCore (x eps)
 :precision binary64
 (let* ((t_0 (- 1.0 (- (pow (tan x) 2.0)))))
   (*
    (fma
     (fma
      (fma
       (fma 1.3333333333333333 x (* 0.6666666666666666 eps))
       x
       0.3333333333333333)
      eps
      (* t_0 (tan x)))
     eps
     t_0)
    eps)))

C

double code(double x, double eps) {
	double t_0 = 1.0 - -pow(tan(x), 2.0);
	return fma(fma(fma(fma(1.3333333333333333, x, (0.6666666666666666 * eps)), x, 0.3333333333333333), eps, (t_0 * tan(x))), eps, t_0) * eps;
}

Julia

function code(x, eps)
	t_0 = Float64(1.0 - Float64(-(tan(x) ^ 2.0)))
	return Float64(fma(fma(fma(fma(1.3333333333333333, x, Float64(0.6666666666666666 * eps)), x, 0.3333333333333333), eps, Float64(t_0 * tan(x))), eps, t_0) * eps)
end

Wolfram

code[x_, eps_] := Block[{t$95$0 = N[(1.0 - (-N[Power[N[Tan[x], $MachinePrecision], 2.0], $MachinePrecision])), $MachinePrecision]}, N[(N[(N[(N[(N[(1.3333333333333333 * x + N[(0.6666666666666666 * eps), $MachinePrecision]), $MachinePrecision] * x + 0.3333333333333333), $MachinePrecision] * eps + N[(t$95$0 * N[Tan[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision] * eps + t$95$0), $MachinePrecision] * eps), $MachinePrecision]]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(\left(1 + \varepsilon \cdot \left(\varepsilon \cdot \left(-1 \cdot \left(\varepsilon \cdot \left(\frac{-1}{2} \cdot \frac{\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{\cos x} + \left(\frac{1}{6} \cdot \frac{\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{\cos x} + \frac{\sin x \cdot \left(\frac{1}{6} + \left(-1 \cdot \frac{{\sin x}^{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{{\cos x}^{2}} + \left(\frac{-1}{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) + \frac{1}{6} \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)\right)}{\cos x}\right)\right)\right) - \left(\frac{1}{6} + \left(-1 \cdot \frac{{\sin x}^{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{{\cos x}^{2}} + \left(\frac{-1}{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) + \frac{1}{6} \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)\right)\right) - -1 \cdot \frac{\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{\cos x}\right)\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]

4. Applied rewrites 99.6%

   \[\leadsto \color{blue}{\left(\mathsf{fma}\left(\mathsf{fma}\left(\left(-\varepsilon\right) \cdot \mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}, -0.5, \frac{\mathsf{fma}\left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), -0.5, {\tan x}^{2} \cdot 0.16666666666666666\right)\right) + 0.16666666666666666, \sin x, 0.16666666666666666 \cdot \left(\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x\right)\right)}{\cos x}\right) - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), -0.5, {\tan x}^{2} \cdot 0.16666666666666666\right)\right) + 0.16666666666666666\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

5. Taylor expanded in x around 0

   \[\leadsto \left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{2}{3} \cdot \left(\varepsilon \cdot x\right) - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), \frac{-1}{2}, {\tan x}^{2} \cdot \frac{1}{6}\right)\right) + \frac{1}{6}\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]
6. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\mathsf{fma}\left(\left(\varepsilon \cdot x\right) \cdot \frac{2}{3} - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), \frac{-1}{2}, {\tan x}^{2} \cdot \frac{1}{6}\right)\right) + \frac{1}{6}\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   2. lower-*.f64 N/A

      \[\leadsto \left(\mathsf{fma}\left(\mathsf{fma}\left(\left(\varepsilon \cdot x\right) \cdot \frac{2}{3} - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), \frac{-1}{2}, {\tan x}^{2} \cdot \frac{1}{6}\right)\right) + \frac{1}{6}\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   3. lower-*.f64 99.5

      \[\leadsto \left(\mathsf{fma}\left(\mathsf{fma}\left(\left(\varepsilon \cdot x\right) \cdot 0.6666666666666666 - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), -0.5, {\tan x}^{2} \cdot 0.16666666666666666\right)\right) + 0.16666666666666666\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

7. Applied rewrites 99.5%

   \[\leadsto \left(\mathsf{fma}\left(\mathsf{fma}\left(\left(\varepsilon \cdot x\right) \cdot 0.6666666666666666 - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), -0.5, {\tan x}^{2} \cdot 0.16666666666666666\right)\right) + 0.16666666666666666\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

9. Applied rewrites 99.5%

   \[\leadsto \color{blue}{\mathsf{fma}\left(\mathsf{fma}\left(\left(\left(\varepsilon \cdot x\right) \cdot 0.6666666666666666 - \mathsf{fma}\left(-1, \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}, \mathsf{fma}\left(-0.5, 1 - \left(-{\tan x}^{2}\right), 0.16666666666666666 \cdot {\tan x}^{2}\right)\right)\right) - 0.16666666666666666, \varepsilon, \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \tan x\right), \varepsilon, 1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

10. Taylor expanded in x around 0

    \[\leadsto \mathsf{fma}\left(\mathsf{fma}\left(\frac{1}{3} + x \cdot \left(\frac{2}{3} \cdot \varepsilon + \frac{4}{3} \cdot x\right), \varepsilon, \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \tan x\right), \varepsilon, 1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

12. Applied rewrites 99.3%

    \[\leadsto \mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(1.3333333333333333, x, 0.6666666666666666 \cdot \varepsilon\right), x, 0.3333333333333333\right), \varepsilon, \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \tan x\right), \varepsilon, 1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]
13. Add Preprocessing

Alternative 4: 99.3% accurate, 0.4× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := 1 - \left(-{\tan x}^{2}\right)\\ \mathsf{fma}\left(t\_0 \cdot \tan x, \varepsilon, t\_0\right) \cdot \varepsilon \end{array} \end{array} \]

FPCore

(FPCore (x eps)
 :precision binary64
 (let* ((t_0 (- 1.0 (- (pow (tan x) 2.0)))))
   (* (fma (* t_0 (tan x)) eps t_0) eps)))

C

double code(double x, double eps) {
	double t_0 = 1.0 - -pow(tan(x), 2.0);
	return fma((t_0 * tan(x)), eps, t_0) * eps;
}

Julia

function code(x, eps)
	t_0 = Float64(1.0 - Float64(-(tan(x) ^ 2.0)))
	return Float64(fma(Float64(t_0 * tan(x)), eps, t_0) * eps)
end

Wolfram

code[x_, eps_] := Block[{t$95$0 = N[(1.0 - (-N[Power[N[Tan[x], $MachinePrecision], 2.0], $MachinePrecision])), $MachinePrecision]}, N[(N[(N[(t$95$0 * N[Tan[x], $MachinePrecision]), $MachinePrecision] * eps + t$95$0), $MachinePrecision] * eps), $MachinePrecision]]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]
3. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   2. lower-*.f64 N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

4. Applied rewrites 99.3%

   \[\leadsto \color{blue}{\left(\mathsf{fma}\left(\varepsilon, \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]
5. Step-by-step derivation

6. Applied rewrites 99.3%

   \[\leadsto \color{blue}{\mathsf{fma}\left(\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \tan x, \varepsilon, 1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]
7. Add Preprocessing

Alternative 5: 98.9% accurate, 0.8× speedup

Math

\[\begin{array}{l} \\ \left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(1.8888888888888888, \varepsilon \cdot \varepsilon, 1.3333333333333333\right), x, 1.3333333333333333 \cdot \varepsilon\right), x, 0.6666666666666666 \cdot \left(\varepsilon \cdot \varepsilon\right)\right) + 1, x, 0.3333333333333333 \cdot \varepsilon\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \end{array} \]

FPCore

(FPCore (x eps)
 :precision binary64
 (*
  (-
   (fma
    (fma
     (+
      (fma
       (fma
        (fma 1.8888888888888888 (* eps eps) 1.3333333333333333)
        x
        (* 1.3333333333333333 eps))
       x
       (* 0.6666666666666666 (* eps eps)))
      1.0)
     x
     (* 0.3333333333333333 eps))
    eps
    1.0)
   (- (pow (tan x) 2.0)))
  eps))

C

double code(double x, double eps) {
	return (fma(fma((fma(fma(fma(1.8888888888888888, (eps * eps), 1.3333333333333333), x, (1.3333333333333333 * eps)), x, (0.6666666666666666 * (eps * eps))) + 1.0), x, (0.3333333333333333 * eps)), eps, 1.0) - -pow(tan(x), 2.0)) * eps;
}

Julia

function code(x, eps)
	return Float64(Float64(fma(fma(Float64(fma(fma(fma(1.8888888888888888, Float64(eps * eps), 1.3333333333333333), x, Float64(1.3333333333333333 * eps)), x, Float64(0.6666666666666666 * Float64(eps * eps))) + 1.0), x, Float64(0.3333333333333333 * eps)), eps, 1.0) - Float64(-(tan(x) ^ 2.0))) * eps)
end

Wolfram

code[x_, eps_] := N[(N[(N[(N[(N[(N[(N[(N[(1.8888888888888888 * N[(eps * eps), $MachinePrecision] + 1.3333333333333333), $MachinePrecision] * x + N[(1.3333333333333333 * eps), $MachinePrecision]), $MachinePrecision] * x + N[(0.6666666666666666 * N[(eps * eps), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] + 1.0), $MachinePrecision] * x + N[(0.3333333333333333 * eps), $MachinePrecision]), $MachinePrecision] * eps + 1.0), $MachinePrecision] - (-N[Power[N[Tan[x], $MachinePrecision], 2.0], $MachinePrecision])), $MachinePrecision] * eps), $MachinePrecision]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(\left(1 + \varepsilon \cdot \left(\varepsilon \cdot \left(-1 \cdot \left(\varepsilon \cdot \left(\frac{-1}{2} \cdot \frac{\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{\cos x} + \left(\frac{1}{6} \cdot \frac{\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{\cos x} + \frac{\sin x \cdot \left(\frac{1}{6} + \left(-1 \cdot \frac{{\sin x}^{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{{\cos x}^{2}} + \left(\frac{-1}{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) + \frac{1}{6} \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)\right)}{\cos x}\right)\right)\right) - \left(\frac{1}{6} + \left(-1 \cdot \frac{{\sin x}^{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{{\cos x}^{2}} + \left(\frac{-1}{2} \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) + \frac{1}{6} \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)\right)\right) - -1 \cdot \frac{\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)}{\cos x}\right)\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]

4. Applied rewrites 99.6%

   \[\leadsto \color{blue}{\left(\mathsf{fma}\left(\mathsf{fma}\left(\left(-\varepsilon\right) \cdot \mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}, -0.5, \frac{\mathsf{fma}\left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), -0.5, {\tan x}^{2} \cdot 0.16666666666666666\right)\right) + 0.16666666666666666, \sin x, 0.16666666666666666 \cdot \left(\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x\right)\right)}{\cos x}\right) - \left(\mathsf{fma}\left(\frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot {\sin x}^{2}}{{\cos x}^{2}}, -1, \mathsf{fma}\left(1 - \left(-{\tan x}^{2}\right), -0.5, {\tan x}^{2} \cdot 0.16666666666666666\right)\right) + 0.16666666666666666\right), \varepsilon, 1 \cdot \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

5. Taylor expanded in x around 0

   \[\leadsto \left(\mathsf{fma}\left(\frac{1}{3} \cdot \varepsilon + x \cdot \left(1 + \left(\frac{2}{3} \cdot {\varepsilon}^{2} + x \cdot \left(\frac{4}{3} \cdot \varepsilon + x \cdot \left(\frac{4}{3} + \frac{17}{9} \cdot {\varepsilon}^{2}\right)\right)\right)\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]
6. Step-by-step derivation

7. Applied rewrites 98.9%

   \[\leadsto \left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(1.8888888888888888, \varepsilon \cdot \varepsilon, 1.3333333333333333\right), x, 1.3333333333333333 \cdot \varepsilon\right), x, 0.6666666666666666 \cdot \left(\varepsilon \cdot \varepsilon\right)\right) + 1, x, 0.3333333333333333 \cdot \varepsilon\right), \varepsilon, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]
8. Add Preprocessing

Alternative 6: 99.0% accurate, 0.9× speedup

Math

\[\begin{array}{l} \\ \left(\mathsf{fma}\left(\varepsilon, x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \end{array} \]

FPCore

(FPCore (x eps)
 :precision binary64
 (* (- (fma eps x 1.0) (- (pow (tan x) 2.0))) eps))

C

double code(double x, double eps) {
	return (fma(eps, x, 1.0) - -pow(tan(x), 2.0)) * eps;
}

Julia

function code(x, eps)
	return Float64(Float64(fma(eps, x, 1.0) - Float64(-(tan(x) ^ 2.0))) * eps)
end

Wolfram

code[x_, eps_] := N[(N[(N[(eps * x + 1.0), $MachinePrecision] - (-N[Power[N[Tan[x], $MachinePrecision], 2.0], $MachinePrecision])), $MachinePrecision] * eps), $MachinePrecision]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]
3. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   2. lower-*.f64 N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

4. Applied rewrites 99.3%

   \[\leadsto \color{blue}{\left(\mathsf{fma}\left(\varepsilon, \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

5. Taylor expanded in x around 0

   \[\leadsto \left(\mathsf{fma}\left(\varepsilon, x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]
6. Step-by-step derivation

   1. *-lft-identity 99.0

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

7. Applied rewrites 99.0%

   \[\leadsto \left(\mathsf{fma}\left(\varepsilon, x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]
8. Add Preprocessing

Alternative 7: 98.9% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \left(1 - \left(-{\tan \left(x + \pi\right)}^{2}\right)\right) \cdot \varepsilon \end{array} \]

FPCore

(FPCore (x eps)
 :precision binary64
 (* (- 1.0 (- (pow (tan (+ x PI)) 2.0))) eps))

C

double code(double x, double eps) {
	return (1.0 - -pow(tan((x + ((double) M_PI))), 2.0)) * eps;
}

Java

public static double code(double x, double eps) {
	return (1.0 - -Math.pow(Math.tan((x + Math.PI)), 2.0)) * eps;
}

Python

def code(x, eps):
	return (1.0 - -math.pow(math.tan((x + math.pi)), 2.0)) * eps

Julia

function code(x, eps)
	return Float64(Float64(1.0 - Float64(-(tan(Float64(x + pi)) ^ 2.0))) * eps)
end

MATLAB

function tmp = code(x, eps)
	tmp = (1.0 - -(tan((x + pi)) ^ 2.0)) * eps;
end

Wolfram

code[x_, eps_] := N[(N[(1.0 - (-N[Power[N[Tan[N[(x + Pi), $MachinePrecision]], $MachinePrecision], 2.0], $MachinePrecision])), $MachinePrecision] * eps), $MachinePrecision]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]
3. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   2. lower-*.f64 N/A

      \[\leadsto \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   3. lower--.f64 N/A

      \[\leadsto \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \varepsilon \]

   4. mul-1-neg N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)\right) \cdot \varepsilon \]

   5. unpow2 N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{\sin x \cdot \sin x}{{\cos x}^{2}}\right)\right)\right) \cdot \varepsilon \]

   6. unpow2 N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{\sin x \cdot \sin x}{\cos x \cdot \cos x}\right)\right)\right) \cdot \varepsilon \]

   7. frac-times N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{\sin x}{\cos x} \cdot \frac{\sin x}{\cos x}\right)\right)\right) \cdot \varepsilon \]

   8. tan-quot N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\tan x \cdot \frac{\sin x}{\cos x}\right)\right)\right) \cdot \varepsilon \]

   9. tan-quot N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\tan x \cdot \tan x\right)\right)\right) \cdot \varepsilon \]

   10. lower-neg.f64 N/A

       \[\leadsto \left(1 - \left(-\tan x \cdot \tan x\right)\right) \cdot \varepsilon \]

   11. pow2 N/A

       \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   12. lower-pow.f64 N/A

       \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   13. lift-tan.f64 98.9

       \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

4. Applied rewrites 98.9%

   \[\leadsto \color{blue}{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]
5. Step-by-step derivation

   1. lift-tan.f64 N/A

      \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   2. tan-+PI-rev N/A

      \[\leadsto \left(1 - \left(-{\tan \left(x + \mathsf{PI}\left(\right)\right)}^{2}\right)\right) \cdot \varepsilon \]

   3. lower-tan.f64 N/A

      \[\leadsto \left(1 - \left(-{\tan \left(x + \mathsf{PI}\left(\right)\right)}^{2}\right)\right) \cdot \varepsilon \]

   4. lower-+.f64 N/A

      \[\leadsto \left(1 - \left(-{\tan \left(x + \mathsf{PI}\left(\right)\right)}^{2}\right)\right) \cdot \varepsilon \]

   5. lower-PI.f64 98.9

      \[\leadsto \left(1 - \left(-{\tan \left(x + \pi\right)}^{2}\right)\right) \cdot \varepsilon \]

6. Applied rewrites 98.9%

   \[\leadsto \left(1 - \left(-{\tan \left(x + \pi\right)}^{2}\right)\right) \cdot \varepsilon \]
7. Add Preprocessing

Alternative 8: 98.9% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \end{array} \]

FPCore

(FPCore (x eps) :precision binary64 (* (- 1.0 (- (pow (tan x) 2.0))) eps))

C

double code(double x, double eps) {
	return (1.0 - -pow(tan(x), 2.0)) * eps;
}

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(x, eps)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: eps
    code = (1.0d0 - -(tan(x) ** 2.0d0)) * eps
end function

Java

public static double code(double x, double eps) {
	return (1.0 - -Math.pow(Math.tan(x), 2.0)) * eps;
}

Python

def code(x, eps):
	return (1.0 - -math.pow(math.tan(x), 2.0)) * eps

Julia

function code(x, eps)
	return Float64(Float64(1.0 - Float64(-(tan(x) ^ 2.0))) * eps)
end

MATLAB

function tmp = code(x, eps)
	tmp = (1.0 - -(tan(x) ^ 2.0)) * eps;
end

Wolfram

code[x_, eps_] := N[(N[(1.0 - (-N[Power[N[Tan[x], $MachinePrecision], 2.0], $MachinePrecision])), $MachinePrecision] * eps), $MachinePrecision]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]
3. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   2. lower-*.f64 N/A

      \[\leadsto \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   3. lower--.f64 N/A

      \[\leadsto \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \varepsilon \]

   4. mul-1-neg N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)\right) \cdot \varepsilon \]

   5. unpow2 N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{\sin x \cdot \sin x}{{\cos x}^{2}}\right)\right)\right) \cdot \varepsilon \]

   6. unpow2 N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{\sin x \cdot \sin x}{\cos x \cdot \cos x}\right)\right)\right) \cdot \varepsilon \]

   7. frac-times N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{\sin x}{\cos x} \cdot \frac{\sin x}{\cos x}\right)\right)\right) \cdot \varepsilon \]

   8. tan-quot N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\tan x \cdot \frac{\sin x}{\cos x}\right)\right)\right) \cdot \varepsilon \]

   9. tan-quot N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\tan x \cdot \tan x\right)\right)\right) \cdot \varepsilon \]

   10. lower-neg.f64 N/A

       \[\leadsto \left(1 - \left(-\tan x \cdot \tan x\right)\right) \cdot \varepsilon \]

   11. pow2 N/A

       \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   12. lower-pow.f64 N/A

       \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   13. lift-tan.f64 98.9

       \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

4. Applied rewrites 98.9%

   \[\leadsto \color{blue}{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]
5. Add Preprocessing

Alternative 9: 98.5% accurate, 1.1× speedup

Math

\[\begin{array}{l} \\ \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(1.1333333333333333, x \cdot x, 1.3333333333333333\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(0.05396825396825397, x \cdot x, 0.13333333333333333\right), x \cdot x, 0.3333333333333333\right), x \cdot x, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \end{array} \]

FPCore

(FPCore (x eps)
 :precision binary64
 (*
  (-
   (fma
    eps
    (* (fma (fma 1.1333333333333333 (* x x) 1.3333333333333333) (* x x) 1.0) x)
    1.0)
   (-
    (pow
     (*
      (fma
       (fma
        (fma 0.05396825396825397 (* x x) 0.13333333333333333)
        (* x x)
        0.3333333333333333)
       (* x x)
       1.0)
      x)
     2.0)))
  eps))

C

double code(double x, double eps) {
	return (fma(eps, (fma(fma(1.1333333333333333, (x * x), 1.3333333333333333), (x * x), 1.0) * x), 1.0) - -pow((fma(fma(fma(0.05396825396825397, (x * x), 0.13333333333333333), (x * x), 0.3333333333333333), (x * x), 1.0) * x), 2.0)) * eps;
}

Julia

function code(x, eps)
	return Float64(Float64(fma(eps, Float64(fma(fma(1.1333333333333333, Float64(x * x), 1.3333333333333333), Float64(x * x), 1.0) * x), 1.0) - Float64(-(Float64(fma(fma(fma(0.05396825396825397, Float64(x * x), 0.13333333333333333), Float64(x * x), 0.3333333333333333), Float64(x * x), 1.0) * x) ^ 2.0))) * eps)
end

Wolfram

code[x_, eps_] := N[(N[(N[(eps * N[(N[(N[(1.1333333333333333 * N[(x * x), $MachinePrecision] + 1.3333333333333333), $MachinePrecision] * N[(x * x), $MachinePrecision] + 1.0), $MachinePrecision] * x), $MachinePrecision] + 1.0), $MachinePrecision] - (-N[Power[N[(N[(N[(N[(0.05396825396825397 * N[(x * x), $MachinePrecision] + 0.13333333333333333), $MachinePrecision] * N[(x * x), $MachinePrecision] + 0.3333333333333333), $MachinePrecision] * N[(x * x), $MachinePrecision] + 1.0), $MachinePrecision] * x), $MachinePrecision], 2.0], $MachinePrecision])), $MachinePrecision] * eps), $MachinePrecision]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]
3. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   2. lower-*.f64 N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

4. Applied rewrites 99.3%

   \[\leadsto \color{blue}{\left(\mathsf{fma}\left(\varepsilon, \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

5. Taylor expanded in x around 0

   \[\leadsto \left(\mathsf{fma}\left(\varepsilon, x \cdot \left(1 + {x}^{2} \cdot \left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}\right)\right), 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]
6. Step-by-step derivation

   1. *-lft-identity N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, x \cdot \left(1 + {x}^{2} \cdot \left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}\right)\right), 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   2. *-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \left(1 + {x}^{2} \cdot \left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}\right)\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   3. lower-*.f64 N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \left(1 + {x}^{2} \cdot \left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}\right)\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   4. +-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \left({x}^{2} \cdot \left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}\right) + 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   5. *-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \left(\left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}\right) \cdot {x}^{2} + 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   6. lower-fma.f64 N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}, {x}^{2}, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   7. +-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\frac{17}{15} \cdot {x}^{2} + \frac{4}{3}, {x}^{2}, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   8. lower-fma.f64 N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, {x}^{2}, \frac{4}{3}\right), {x}^{2}, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   9. pow2 N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), {x}^{2}, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   10. lift-*.f64 N/A

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), {x}^{2}, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   11. pow2 N/A

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   12. lift-*.f64 98.7

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(1.1333333333333333, x \cdot x, 1.3333333333333333\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

7. Applied rewrites 98.7%

   \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(1.1333333333333333, x \cdot x, 1.3333333333333333\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

8. Taylor expanded in x around 0

   \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(x \cdot \left(1 + {x}^{2} \cdot \left(\frac{1}{3} + {x}^{2} \cdot \left(\frac{2}{15} + \frac{17}{315} \cdot {x}^{2}\right)\right)\right)\right)}^{2}\right)\right) \cdot \varepsilon \]
9. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\left(1 + {x}^{2} \cdot \left(\frac{1}{3} + {x}^{2} \cdot \left(\frac{2}{15} + \frac{17}{315} \cdot {x}^{2}\right)\right)\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   2. lower-*.f64 N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\left(1 + {x}^{2} \cdot \left(\frac{1}{3} + {x}^{2} \cdot \left(\frac{2}{15} + \frac{17}{315} \cdot {x}^{2}\right)\right)\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   3. +-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\left({x}^{2} \cdot \left(\frac{1}{3} + {x}^{2} \cdot \left(\frac{2}{15} + \frac{17}{315} \cdot {x}^{2}\right)\right) + 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   4. *-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\left(\left(\frac{1}{3} + {x}^{2} \cdot \left(\frac{2}{15} + \frac{17}{315} \cdot {x}^{2}\right)\right) \cdot {x}^{2} + 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   5. lower-fma.f64 N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\frac{1}{3} + {x}^{2} \cdot \left(\frac{2}{15} + \frac{17}{315} \cdot {x}^{2}\right), {x}^{2}, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   6. +-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left({x}^{2} \cdot \left(\frac{2}{15} + \frac{17}{315} \cdot {x}^{2}\right) + \frac{1}{3}, {x}^{2}, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   7. *-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\left(\frac{2}{15} + \frac{17}{315} \cdot {x}^{2}\right) \cdot {x}^{2} + \frac{1}{3}, {x}^{2}, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   8. lower-fma.f64 N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{2}{15} + \frac{17}{315} \cdot {x}^{2}, {x}^{2}, \frac{1}{3}\right), {x}^{2}, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   9. +-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{315} \cdot {x}^{2} + \frac{2}{15}, {x}^{2}, \frac{1}{3}\right), {x}^{2}, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   10. lower-fma.f64 N/A

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{315}, {x}^{2}, \frac{2}{15}\right), {x}^{2}, \frac{1}{3}\right), {x}^{2}, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   11. pow2 N/A

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{315}, x \cdot x, \frac{2}{15}\right), {x}^{2}, \frac{1}{3}\right), {x}^{2}, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   12. lift-*.f64 N/A

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{315}, x \cdot x, \frac{2}{15}\right), {x}^{2}, \frac{1}{3}\right), {x}^{2}, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   13. pow2 N/A

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{315}, x \cdot x, \frac{2}{15}\right), x \cdot x, \frac{1}{3}\right), {x}^{2}, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   14. lift-*.f64 N/A

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{315}, x \cdot x, \frac{2}{15}\right), x \cdot x, \frac{1}{3}\right), {x}^{2}, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   15. pow2 N/A

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{315}, x \cdot x, \frac{2}{15}\right), x \cdot x, \frac{1}{3}\right), x \cdot x, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

   16. lift-*.f64 98.5

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(1.1333333333333333, x \cdot x, 1.3333333333333333\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(0.05396825396825397, x \cdot x, 0.13333333333333333\right), x \cdot x, 0.3333333333333333\right), x \cdot x, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]

10. Applied rewrites 98.5%

    \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(1.1333333333333333, x \cdot x, 1.3333333333333333\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\left(\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(0.05396825396825397, x \cdot x, 0.13333333333333333\right), x \cdot x, 0.3333333333333333\right), x \cdot x, 1\right) \cdot x\right)}^{2}\right)\right) \cdot \varepsilon \]
11. Add Preprocessing

Alternative 10: 98.5% accurate, 2.3× speedup

Math

\[\begin{array}{l} \\ \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(1.1333333333333333, x \cdot x, 1.3333333333333333\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(\left(\left(-0.19682539682539682 \cdot \left(x \cdot x\right) - 0.37777777777777777\right) \cdot \left(x \cdot x\right) - 0.6666666666666666\right) \cdot \left(x \cdot x\right) - 1\right) \cdot \left(x \cdot x\right)\right) \cdot \varepsilon \end{array} \]

FPCore

(FPCore (x eps)
 :precision binary64
 (*
  (-
   (fma
    eps
    (* (fma (fma 1.1333333333333333 (* x x) 1.3333333333333333) (* x x) 1.0) x)
    1.0)
   (*
    (-
     (*
      (-
       (* (- (* -0.19682539682539682 (* x x)) 0.37777777777777777) (* x x))
       0.6666666666666666)
      (* x x))
     1.0)
    (* x x)))
  eps))

C

double code(double x, double eps) {
	return (fma(eps, (fma(fma(1.1333333333333333, (x * x), 1.3333333333333333), (x * x), 1.0) * x), 1.0) - (((((((-0.19682539682539682 * (x * x)) - 0.37777777777777777) * (x * x)) - 0.6666666666666666) * (x * x)) - 1.0) * (x * x))) * eps;
}

Julia

function code(x, eps)
	return Float64(Float64(fma(eps, Float64(fma(fma(1.1333333333333333, Float64(x * x), 1.3333333333333333), Float64(x * x), 1.0) * x), 1.0) - Float64(Float64(Float64(Float64(Float64(Float64(Float64(-0.19682539682539682 * Float64(x * x)) - 0.37777777777777777) * Float64(x * x)) - 0.6666666666666666) * Float64(x * x)) - 1.0) * Float64(x * x))) * eps)
end

Wolfram

code[x_, eps_] := N[(N[(N[(eps * N[(N[(N[(1.1333333333333333 * N[(x * x), $MachinePrecision] + 1.3333333333333333), $MachinePrecision] * N[(x * x), $MachinePrecision] + 1.0), $MachinePrecision] * x), $MachinePrecision] + 1.0), $MachinePrecision] - N[(N[(N[(N[(N[(N[(N[(-0.19682539682539682 * N[(x * x), $MachinePrecision]), $MachinePrecision] - 0.37777777777777777), $MachinePrecision] * N[(x * x), $MachinePrecision]), $MachinePrecision] - 0.6666666666666666), $MachinePrecision] * N[(x * x), $MachinePrecision]), $MachinePrecision] - 1.0), $MachinePrecision] * N[(x * x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] * eps), $MachinePrecision]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]
3. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   2. lower-*.f64 N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

4. Applied rewrites 99.3%

   \[\leadsto \color{blue}{\left(\mathsf{fma}\left(\varepsilon, \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

5. Taylor expanded in x around 0

   \[\leadsto \left(\mathsf{fma}\left(\varepsilon, x \cdot \left(1 + {x}^{2} \cdot \left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}\right)\right), 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]
6. Step-by-step derivation

   1. *-lft-identity N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, x \cdot \left(1 + {x}^{2} \cdot \left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}\right)\right), 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   2. *-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \left(1 + {x}^{2} \cdot \left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}\right)\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   3. lower-*.f64 N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \left(1 + {x}^{2} \cdot \left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}\right)\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   4. +-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \left({x}^{2} \cdot \left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}\right) + 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   5. *-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \left(\left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}\right) \cdot {x}^{2} + 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   6. lower-fma.f64 N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\frac{4}{3} + \frac{17}{15} \cdot {x}^{2}, {x}^{2}, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   7. +-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\frac{17}{15} \cdot {x}^{2} + \frac{4}{3}, {x}^{2}, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   8. lower-fma.f64 N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, {x}^{2}, \frac{4}{3}\right), {x}^{2}, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   9. pow2 N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), {x}^{2}, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   10. lift-*.f64 N/A

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), {x}^{2}, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   11. pow2 N/A

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   12. lift-*.f64 98.7

       \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(1.1333333333333333, x \cdot x, 1.3333333333333333\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

7. Applied rewrites 98.7%

   \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(1.1333333333333333, x \cdot x, 1.3333333333333333\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

8. Taylor expanded in x around 0

   \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - {x}^{2} \cdot \left({x}^{2} \cdot \left({x}^{2} \cdot \left(\frac{-62}{315} \cdot {x}^{2} - \frac{17}{45}\right) - \frac{2}{3}\right) - 1\right)\right) \cdot \varepsilon \]
9. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left({x}^{2} \cdot \left({x}^{2} \cdot \left(\frac{-62}{315} \cdot {x}^{2} - \frac{17}{45}\right) - \frac{2}{3}\right) - 1\right) \cdot {x}^{2}\right) \cdot \varepsilon \]

   2. lower-*.f64 N/A

      \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(\frac{17}{15}, x \cdot x, \frac{4}{3}\right), x \cdot x, 1\right) \cdot x, 1\right) - \left({x}^{2} \cdot \left({x}^{2} \cdot \left(\frac{-62}{315} \cdot {x}^{2} - \frac{17}{45}\right) - \frac{2}{3}\right) - 1\right) \cdot {x}^{2}\right) \cdot \varepsilon \]

10. Applied rewrites 98.5%

    \[\leadsto \left(\mathsf{fma}\left(\varepsilon, \mathsf{fma}\left(\mathsf{fma}\left(1.1333333333333333, x \cdot x, 1.3333333333333333\right), x \cdot x, 1\right) \cdot x, 1\right) - \left(\left(\left(-0.19682539682539682 \cdot \left(x \cdot x\right) - 0.37777777777777777\right) \cdot \left(x \cdot x\right) - 0.6666666666666666\right) \cdot \left(x \cdot x\right) - 1\right) \cdot \left(x \cdot x\right)\right) \cdot \varepsilon \]
11. Add Preprocessing

Alternative 11: 98.4% accurate, 3.8× speedup

Math

\[\begin{array}{l} \\ \left(1 - \left(-\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(0.19682539682539682, x \cdot x, 0.37777777777777777\right), x \cdot x, 0.6666666666666666\right), x \cdot x, 1\right) \cdot \left(x \cdot x\right)\right)\right) \cdot \varepsilon \end{array} \]

FPCore

(FPCore (x eps)
 :precision binary64
 (*
  (-
   1.0
   (-
    (*
     (fma
      (fma
       (fma 0.19682539682539682 (* x x) 0.37777777777777777)
       (* x x)
       0.6666666666666666)
      (* x x)
      1.0)
     (* x x))))
  eps))

C

double code(double x, double eps) {
	return (1.0 - -(fma(fma(fma(0.19682539682539682, (x * x), 0.37777777777777777), (x * x), 0.6666666666666666), (x * x), 1.0) * (x * x))) * eps;
}

Julia

function code(x, eps)
	return Float64(Float64(1.0 - Float64(-Float64(fma(fma(fma(0.19682539682539682, Float64(x * x), 0.37777777777777777), Float64(x * x), 0.6666666666666666), Float64(x * x), 1.0) * Float64(x * x)))) * eps)
end

Wolfram

code[x_, eps_] := N[(N[(1.0 - (-N[(N[(N[(N[(0.19682539682539682 * N[(x * x), $MachinePrecision] + 0.37777777777777777), $MachinePrecision] * N[(x * x), $MachinePrecision] + 0.6666666666666666), $MachinePrecision] * N[(x * x), $MachinePrecision] + 1.0), $MachinePrecision] * N[(x * x), $MachinePrecision]), $MachinePrecision])), $MachinePrecision] * eps), $MachinePrecision]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]
3. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   2. lower-*.f64 N/A

      \[\leadsto \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   3. lower--.f64 N/A

      \[\leadsto \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \varepsilon \]

   4. mul-1-neg N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)\right) \cdot \varepsilon \]

   5. unpow2 N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{\sin x \cdot \sin x}{{\cos x}^{2}}\right)\right)\right) \cdot \varepsilon \]

   6. unpow2 N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{\sin x \cdot \sin x}{\cos x \cdot \cos x}\right)\right)\right) \cdot \varepsilon \]

   7. frac-times N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{\sin x}{\cos x} \cdot \frac{\sin x}{\cos x}\right)\right)\right) \cdot \varepsilon \]

   8. tan-quot N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\tan x \cdot \frac{\sin x}{\cos x}\right)\right)\right) \cdot \varepsilon \]

   9. tan-quot N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\tan x \cdot \tan x\right)\right)\right) \cdot \varepsilon \]

   10. lower-neg.f64 N/A

       \[\leadsto \left(1 - \left(-\tan x \cdot \tan x\right)\right) \cdot \varepsilon \]

   11. pow2 N/A

       \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   12. lower-pow.f64 N/A

       \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   13. lift-tan.f64 98.9

       \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

4. Applied rewrites 98.9%

   \[\leadsto \color{blue}{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

5. Taylor expanded in x around 0

   \[\leadsto \left(1 - \left(-{x}^{2} \cdot \left(1 + {x}^{2} \cdot \left(\frac{2}{3} + {x}^{2} \cdot \left(\frac{17}{45} + \frac{62}{315} \cdot {x}^{2}\right)\right)\right)\right)\right) \cdot \varepsilon \]
6. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(1 - \left(-\left(1 + {x}^{2} \cdot \left(\frac{2}{3} + {x}^{2} \cdot \left(\frac{17}{45} + \frac{62}{315} \cdot {x}^{2}\right)\right)\right) \cdot {x}^{2}\right)\right) \cdot \varepsilon \]

   2. lower-*.f64 N/A

      \[\leadsto \left(1 - \left(-\left(1 + {x}^{2} \cdot \left(\frac{2}{3} + {x}^{2} \cdot \left(\frac{17}{45} + \frac{62}{315} \cdot {x}^{2}\right)\right)\right) \cdot {x}^{2}\right)\right) \cdot \varepsilon \]

7. Applied rewrites 98.4%

   \[\leadsto \left(1 - \left(-\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(0.19682539682539682, x \cdot x, 0.37777777777777777\right), x \cdot x, 0.6666666666666666\right), x \cdot x, 1\right) \cdot \left(x \cdot x\right)\right)\right) \cdot \varepsilon \]
8. Add Preprocessing

Alternative 12: 98.3% accurate, 7.1× speedup

Math

\[\begin{array}{l} \\ \mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(1.3333333333333333 \cdot \varepsilon, x, 1\right), x, \varepsilon\right), x, 1\right) \cdot \varepsilon \end{array} \]

FPCore

(FPCore (x eps)
 :precision binary64
 (* (fma (fma (fma (* 1.3333333333333333 eps) x 1.0) x eps) x 1.0) eps))

C

double code(double x, double eps) {
	return fma(fma(fma((1.3333333333333333 * eps), x, 1.0), x, eps), x, 1.0) * eps;
}

Julia

function code(x, eps)
	return Float64(fma(fma(fma(Float64(1.3333333333333333 * eps), x, 1.0), x, eps), x, 1.0) * eps)
end

Wolfram

code[x_, eps_] := N[(N[(N[(N[(N[(1.3333333333333333 * eps), $MachinePrecision] * x + 1.0), $MachinePrecision] * x + eps), $MachinePrecision] * x + 1.0), $MachinePrecision] * eps), $MachinePrecision]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]
3. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   2. lower-*.f64 N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

4. Applied rewrites 99.3%

   \[\leadsto \color{blue}{\left(\mathsf{fma}\left(\varepsilon, \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

5. Taylor expanded in x around 0

   \[\leadsto \left(1 + x \cdot \left(\varepsilon + x \cdot \left(1 + x \cdot \left(\frac{5}{6} \cdot \varepsilon - \frac{-1}{2} \cdot \varepsilon\right)\right)\right)\right) \cdot \varepsilon \]
6. Step-by-step derivation

   1. +-commutative N/A

      \[\leadsto \left(x \cdot \left(\varepsilon + x \cdot \left(1 + x \cdot \left(\frac{5}{6} \cdot \varepsilon - \frac{-1}{2} \cdot \varepsilon\right)\right)\right) + 1\right) \cdot \varepsilon \]

   2. *-commutative N/A

      \[\leadsto \left(\left(\varepsilon + x \cdot \left(1 + x \cdot \left(\frac{5}{6} \cdot \varepsilon - \frac{-1}{2} \cdot \varepsilon\right)\right)\right) \cdot x + 1\right) \cdot \varepsilon \]

   3. lower-fma.f64 N/A

      \[\leadsto \mathsf{fma}\left(\varepsilon + x \cdot \left(1 + x \cdot \left(\frac{5}{6} \cdot \varepsilon - \frac{-1}{2} \cdot \varepsilon\right)\right), x, 1\right) \cdot \varepsilon \]

7. Applied rewrites 98.3%

   \[\leadsto \mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(1.3333333333333333 \cdot \varepsilon, x, 1\right), x, \varepsilon\right), x, 1\right) \cdot \varepsilon \]
8. Add Preprocessing

Alternative 13: 98.4% accurate, 11.5× speedup

Math

\[\begin{array}{l} \\ \mathsf{fma}\left(\mathsf{fma}\left(\varepsilon, \varepsilon, \varepsilon \cdot x\right), x, \varepsilon\right) \end{array} \]

FPCore

(FPCore (x eps) :precision binary64 (fma (fma eps eps (* eps x)) x eps))

C

double code(double x, double eps) {
	return fma(fma(eps, eps, (eps * x)), x, eps);
}

Julia

function code(x, eps)
	return fma(fma(eps, eps, Float64(eps * x)), x, eps)
end

Wolfram

code[x_, eps_] := N[(N[(eps * eps + N[(eps * x), $MachinePrecision]), $MachinePrecision] * x + eps), $MachinePrecision]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]
3. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   2. lower-*.f64 N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

4. Applied rewrites 99.3%

   \[\leadsto \color{blue}{\left(\mathsf{fma}\left(\varepsilon, \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

5. Taylor expanded in x around 0

   \[\leadsto \varepsilon + \color{blue}{x \cdot \left(\varepsilon \cdot x + {\varepsilon}^{2}\right)} \]
6. Step-by-step derivation

   1. +-commutative N/A

      \[\leadsto x \cdot \left(\varepsilon \cdot x + {\varepsilon}^{2}\right) + \varepsilon \]

   2. *-commutative N/A

      \[\leadsto \left(\varepsilon \cdot x + {\varepsilon}^{2}\right) \cdot x + \varepsilon \]

   3. lower-fma.f64 N/A

      \[\leadsto \mathsf{fma}\left(\varepsilon \cdot x + {\varepsilon}^{2}, x, \varepsilon\right) \]

   4. +-commutative N/A

      \[\leadsto \mathsf{fma}\left({\varepsilon}^{2} + \varepsilon \cdot x, x, \varepsilon\right) \]

   5. unpow2 N/A

      \[\leadsto \mathsf{fma}\left(\varepsilon \cdot \varepsilon + \varepsilon \cdot x, x, \varepsilon\right) \]

   6. lower-fma.f64 N/A

      \[\leadsto \mathsf{fma}\left(\mathsf{fma}\left(\varepsilon, \varepsilon, \varepsilon \cdot x\right), x, \varepsilon\right) \]

   7. lower-*.f64 98.4

      \[\leadsto \mathsf{fma}\left(\mathsf{fma}\left(\varepsilon, \varepsilon, \varepsilon \cdot x\right), x, \varepsilon\right) \]

7. Applied rewrites 98.4%

   \[\leadsto \mathsf{fma}\left(\mathsf{fma}\left(\varepsilon, \varepsilon, \varepsilon \cdot x\right), \color{blue}{x}, \varepsilon\right) \]
8. Add Preprocessing

Alternative 14: 98.4% accurate, 13.8× speedup

Math

\[\begin{array}{l} \\ \mathsf{fma}\left(\varepsilon + x, x, 1\right) \cdot \varepsilon \end{array} \]

FPCore

(FPCore (x eps) :precision binary64 (* (fma (+ eps x) x 1.0) eps))

C

double code(double x, double eps) {
	return fma((eps + x), x, 1.0) * eps;
}

Julia

function code(x, eps)
	return Float64(fma(Float64(eps + x), x, 1.0) * eps)
end

Wolfram

code[x_, eps_] := N[(N[(N[(eps + x), $MachinePrecision] * x + 1.0), $MachinePrecision] * eps), $MachinePrecision]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]
3. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   2. lower-*.f64 N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

4. Applied rewrites 99.3%

   \[\leadsto \color{blue}{\left(\mathsf{fma}\left(\varepsilon, \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

5. Taylor expanded in x around 0

   \[\leadsto \left(1 + x \cdot \left(\varepsilon + x\right)\right) \cdot \varepsilon \]
6. Step-by-step derivation

   1. +-commutative N/A

      \[\leadsto \left(x \cdot \left(\varepsilon + x\right) + 1\right) \cdot \varepsilon \]

   2. +-commutative N/A

      \[\leadsto \left(x \cdot \left(x + \varepsilon\right) + 1\right) \cdot \varepsilon \]

   3. *-commutative N/A

      \[\leadsto \left(\left(x + \varepsilon\right) \cdot x + 1\right) \cdot \varepsilon \]

   4. lower-fma.f64 N/A

      \[\leadsto \mathsf{fma}\left(x + \varepsilon, x, 1\right) \cdot \varepsilon \]

   5. +-commutative N/A

      \[\leadsto \mathsf{fma}\left(\varepsilon + x, x, 1\right) \cdot \varepsilon \]

   6. lower-+.f64 98.4

      \[\leadsto \mathsf{fma}\left(\varepsilon + x, x, 1\right) \cdot \varepsilon \]

7. Applied rewrites 98.4%

   \[\leadsto \mathsf{fma}\left(\varepsilon + x, x, 1\right) \cdot \varepsilon \]
8. Add Preprocessing

Alternative 15: 98.3% accurate, 17.3× speedup

Math

\[\begin{array}{l} \\ \mathsf{fma}\left(x \cdot x, \varepsilon, \varepsilon\right) \end{array} \]

FPCore

(FPCore (x eps) :precision binary64 (fma (* x x) eps eps))

C

double code(double x, double eps) {
	return fma((x * x), eps, eps);
}

Julia

function code(x, eps)
	return fma(Float64(x * x), eps, eps)
end

Wolfram

code[x_, eps_] := N[(N[(x * x), $MachinePrecision] * eps + eps), $MachinePrecision]

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]
3. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   2. lower-*.f64 N/A

      \[\leadsto \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   3. lower--.f64 N/A

      \[\leadsto \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \varepsilon \]

   4. mul-1-neg N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)\right) \cdot \varepsilon \]

   5. unpow2 N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{\sin x \cdot \sin x}{{\cos x}^{2}}\right)\right)\right) \cdot \varepsilon \]

   6. unpow2 N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{\sin x \cdot \sin x}{\cos x \cdot \cos x}\right)\right)\right) \cdot \varepsilon \]

   7. frac-times N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\frac{\sin x}{\cos x} \cdot \frac{\sin x}{\cos x}\right)\right)\right) \cdot \varepsilon \]

   8. tan-quot N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\tan x \cdot \frac{\sin x}{\cos x}\right)\right)\right) \cdot \varepsilon \]

   9. tan-quot N/A

      \[\leadsto \left(1 - \left(\mathsf{neg}\left(\tan x \cdot \tan x\right)\right)\right) \cdot \varepsilon \]

   10. lower-neg.f64 N/A

       \[\leadsto \left(1 - \left(-\tan x \cdot \tan x\right)\right) \cdot \varepsilon \]

   11. pow2 N/A

       \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   12. lower-pow.f64 N/A

       \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

   13. lift-tan.f64 98.9

       \[\leadsto \left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon \]

4. Applied rewrites 98.9%

   \[\leadsto \color{blue}{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

5. Taylor expanded in x around 0

   \[\leadsto \varepsilon + \color{blue}{\varepsilon \cdot {x}^{2}} \]
6. Step-by-step derivation

   1. +-commutative N/A

      \[\leadsto \varepsilon \cdot {x}^{2} + \varepsilon \]

   2. *-commutative N/A

      \[\leadsto {x}^{2} \cdot \varepsilon + \varepsilon \]

   3. lower-fma.f64 N/A

      \[\leadsto \mathsf{fma}\left({x}^{2}, \varepsilon, \varepsilon\right) \]

   4. pow2 N/A

      \[\leadsto \mathsf{fma}\left(x \cdot x, \varepsilon, \varepsilon\right) \]

   5. lift-*.f64 98.3

      \[\leadsto \mathsf{fma}\left(x \cdot x, \varepsilon, \varepsilon\right) \]

7. Applied rewrites 98.3%

   \[\leadsto \mathsf{fma}\left(x \cdot x, \color{blue}{\varepsilon}, \varepsilon\right) \]
8. Add Preprocessing

Alternative 16: 97.9% accurate, 207.0× speedup

Math

\[\begin{array}{l} \\ \varepsilon \end{array} \]

FPCore

(FPCore (x eps) :precision binary64 eps)

C

double code(double x, double eps) {
	return eps;
}

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(x, eps)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: eps
    code = eps
end function

Java

public static double code(double x, double eps) {
	return eps;
}

Python

def code(x, eps):
	return eps

Julia

function code(x, eps)
	return eps
end

MATLAB

function tmp = code(x, eps)
	tmp = eps;
end

Wolfram

code[x_, eps_] := eps

Derivation

1. Initial program 62.5%

   \[\tan \left(x + \varepsilon\right) - \tan x \]

2. Taylor expanded in eps around 0

   \[\leadsto \color{blue}{\varepsilon \cdot \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)} \]
3. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

   2. lower-*.f64 N/A

      \[\leadsto \left(\left(1 + \frac{\varepsilon \cdot \left(\sin x \cdot \left(1 - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right)\right)}{\cos x}\right) - -1 \cdot \frac{{\sin x}^{2}}{{\cos x}^{2}}\right) \cdot \color{blue}{\varepsilon} \]

4. Applied rewrites 99.3%

   \[\leadsto \color{blue}{\left(\mathsf{fma}\left(\varepsilon, \frac{\left(1 - \left(-{\tan x}^{2}\right)\right) \cdot \sin x}{\cos x}, 1\right) - \left(-{\tan x}^{2}\right)\right) \cdot \varepsilon} \]

5. Taylor expanded in x around 0

   \[\leadsto \varepsilon \]
6. Step-by-step derivation

7. Applied rewrites 97.9%

   \[\leadsto \varepsilon \]
8. Add Preprocessing

Developer Target 1: 99.9% accurate, 0.6× speedup

Math

\[\begin{array}{l} \\ \frac{\sin \varepsilon}{\cos x \cdot \cos \left(x + \varepsilon\right)} \end{array} \]

FPCore

(FPCore (x eps) :precision binary64 (/ (sin eps) (* (cos x) (cos (+ x eps)))))

C

double code(double x, double eps) {
	return sin(eps) / (cos(x) * cos((x + eps)));
}

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(x, eps)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: eps
    code = sin(eps) / (cos(x) * cos((x + eps)))
end function

Java

public static double code(double x, double eps) {
	return Math.sin(eps) / (Math.cos(x) * Math.cos((x + eps)));
}

Python

def code(x, eps):
	return math.sin(eps) / (math.cos(x) * math.cos((x + eps)))

Julia

function code(x, eps)
	return Float64(sin(eps) / Float64(cos(x) * cos(Float64(x + eps))))
end

MATLAB

function tmp = code(x, eps)
	tmp = sin(eps) / (cos(x) * cos((x + eps)));
end

Wolfram

code[x_, eps_] := N[(N[Sin[eps], $MachinePrecision] / N[(N[Cos[x], $MachinePrecision] * N[Cos[N[(x + eps), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Developer Target 2: 62.6% accurate, 0.4× speedup

Math

\[\begin{array}{l} \\ \frac{\tan x + \tan \varepsilon}{1 - \tan x \cdot \tan \varepsilon} - \tan x \end{array} \]

FPCore

(FPCore (x eps)
 :precision binary64
 (- (/ (+ (tan x) (tan eps)) (- 1.0 (* (tan x) (tan eps)))) (tan x)))

C

double code(double x, double eps) {
	return ((tan(x) + tan(eps)) / (1.0 - (tan(x) * tan(eps)))) - tan(x);
}

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(x, eps)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: eps
    code = ((tan(x) + tan(eps)) / (1.0d0 - (tan(x) * tan(eps)))) - tan(x)
end function

Java

public static double code(double x, double eps) {
	return ((Math.tan(x) + Math.tan(eps)) / (1.0 - (Math.tan(x) * Math.tan(eps)))) - Math.tan(x);
}

Python

def code(x, eps):
	return ((math.tan(x) + math.tan(eps)) / (1.0 - (math.tan(x) * math.tan(eps)))) - math.tan(x)

Julia

function code(x, eps)
	return Float64(Float64(Float64(tan(x) + tan(eps)) / Float64(1.0 - Float64(tan(x) * tan(eps)))) - tan(x))
end

MATLAB

function tmp = code(x, eps)
	tmp = ((tan(x) + tan(eps)) / (1.0 - (tan(x) * tan(eps)))) - tan(x);
end

Wolfram

code[x_, eps_] := N[(N[(N[(N[Tan[x], $MachinePrecision] + N[Tan[eps], $MachinePrecision]), $MachinePrecision] / N[(1.0 - N[(N[Tan[x], $MachinePrecision] * N[Tan[eps], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - N[Tan[x], $MachinePrecision]), $MachinePrecision]

Developer Target 3: 98.9% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \varepsilon + \left(\varepsilon \cdot \tan x\right) \cdot \tan x \end{array} \]

FPCore

(FPCore (x eps) :precision binary64 (+ eps (* (* eps (tan x)) (tan x))))

C

double code(double x, double eps) {
	return eps + ((eps * tan(x)) * tan(x));
}

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(x, eps)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: eps
    code = eps + ((eps * tan(x)) * tan(x))
end function

Java

public static double code(double x, double eps) {
	return eps + ((eps * Math.tan(x)) * Math.tan(x));
}

Python

def code(x, eps):
	return eps + ((eps * math.tan(x)) * math.tan(x))

Julia

function code(x, eps)
	return Float64(eps + Float64(Float64(eps * tan(x)) * tan(x)))
end

MATLAB

function tmp = code(x, eps)
	tmp = eps + ((eps * tan(x)) * tan(x));
end

Wolfram

code[x_, eps_] := N[(eps + N[(N[(eps * N[Tan[x], $MachinePrecision]), $MachinePrecision] * N[Tan[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Reproduce

herbie shell --seed 2025101 
(FPCore (x eps)
  :name "2tan (problem 3.3.2)"
  :precision binary64
  :pre (and (and (and (<= -10000.0 x) (<= x 10000.0)) (< (* 1e-16 (fabs x)) eps)) (< eps (fabs x)))

  :alt
  (! :herbie-platform default (/ (sin eps) (* (cos x) (cos (+ x eps)))))

  :alt
  (! :herbie-platform default (- (/ (+ (tan x) (tan eps)) (- 1 (* (tan x) (tan eps)))) (tan x)))

  :alt
  (! :herbie-platform default (+ eps (* eps (tan x) (tan x))))

  (- (tan (+ x eps)) (tan x)))