Graphics.Rendering.Chart.Axis.Types:hBufferRect from Chart-1.5.3

Percentage Accurate: 99.9% → 100.0%

Time: 4.7s

Alternatives: 4

Speedup: 1.0×

Specification

Math

\[\begin{array}{l} \\ x + \frac{x - y}{2} \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (+ x (/ (- x y) 2.0)))

C

double code(double x, double y) {
	return x + ((x - y) / 2.0);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = x + ((x - y) / 2.0d0)
end function

Java

public static double code(double x, double y) {
	return x + ((x - y) / 2.0);
}

Python

def code(x, y):
	return x + ((x - y) / 2.0)

Julia

function code(x, y)
	return Float64(x + Float64(Float64(x - y) / 2.0))
end

MATLAB

function tmp = code(x, y)
	tmp = x + ((x - y) / 2.0);
end

Wolfram

code[x_, y_] := N[(x + N[(N[(x - y), $MachinePrecision] / 2.0), $MachinePrecision]), $MachinePrecision]

Initial Program: 99.9% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ x + \frac{x - y}{2} \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (+ x (/ (- x y) 2.0)))

C

double code(double x, double y) {
	return x + ((x - y) / 2.0);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = x + ((x - y) / 2.0d0)
end function

Java

public static double code(double x, double y) {
	return x + ((x - y) / 2.0);
}

Python

def code(x, y):
	return x + ((x - y) / 2.0)

Julia

function code(x, y)
	return Float64(x + Float64(Float64(x - y) / 2.0))
end

MATLAB

function tmp = code(x, y)
	tmp = x + ((x - y) / 2.0);
end

Wolfram

code[x_, y_] := N[(x + N[(N[(x - y), $MachinePrecision] / 2.0), $MachinePrecision]), $MachinePrecision]

Alternative 1: 100.0% accurate, 0.1× speedup

Math

\[\begin{array}{l} \\ \mathsf{fma}\left(x, 1.5, y \cdot -0.5\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (fma x 1.5 (* y -0.5)))

C

double code(double x, double y) {
	return fma(x, 1.5, (y * -0.5));
}

Julia

function code(x, y)
	return fma(x, 1.5, Float64(y * -0.5))
end

Wolfram

code[x_, y_] := N[(x * 1.5 + N[(y * -0.5), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.9%

   \[x + \frac{x - y}{2} \]
2. Step-by-step derivation

   1. sub-neg 99.9%

      \[\leadsto x + \frac{\color{blue}{x + \left(-y\right)}}{2} \]

   2. +-commutative 99.9%

      \[\leadsto x + \frac{\color{blue}{\left(-y\right) + x}}{2} \]

   3. remove-double-neg 99.9%

      \[\leadsto x + \frac{\left(-y\right) + \color{blue}{\left(-\left(-x\right)\right)}}{2} \]

   4. unsub-neg 99.9%

      \[\leadsto x + \frac{\color{blue}{\left(-y\right) - \left(-x\right)}}{2} \]

   5. div-sub 99.9%

      \[\leadsto x + \color{blue}{\left(\frac{-y}{2} - \frac{-x}{2}\right)} \]

   6. associate-+r- 99.9%

      \[\leadsto \color{blue}{\left(x + \frac{-y}{2}\right) - \frac{-x}{2}} \]

   7. +-commutative 99.9%

      \[\leadsto \color{blue}{\left(\frac{-y}{2} + x\right)} - \frac{-x}{2} \]

   8. associate-+r- 99.9%

      \[\leadsto \color{blue}{\frac{-y}{2} + \left(x - \frac{-x}{2}\right)} \]

   9. neg-mul-1 99.9%

      \[\leadsto \frac{\color{blue}{-1 \cdot y}}{2} + \left(x - \frac{-x}{2}\right) \]

   10. *-commutative 99.9%

       \[\leadsto \frac{\color{blue}{y \cdot -1}}{2} + \left(x - \frac{-x}{2}\right) \]

   11. associate-/l* 99.9%

       \[\leadsto \color{blue}{y \cdot \frac{-1}{2}} + \left(x - \frac{-x}{2}\right) \]

   12. metadata-eval 99.9%

       \[\leadsto y \cdot \color{blue}{-0.5} + \left(x - \frac{-x}{2}\right) \]

   13. *-rgt-identity 99.9%

       \[\leadsto y \cdot -0.5 + \left(\color{blue}{x \cdot 1} - \frac{-x}{2}\right) \]

   14. metadata-eval 99.9%

       \[\leadsto y \cdot -0.5 + \left(x \cdot \color{blue}{\left(--1\right)} - \frac{-x}{2}\right) \]

   15. neg-mul-1 99.9%

       \[\leadsto y \cdot -0.5 + \left(x \cdot \left(--1\right) - \frac{\color{blue}{-1 \cdot x}}{2}\right) \]

   16. *-commutative 99.9%

       \[\leadsto y \cdot -0.5 + \left(x \cdot \left(--1\right) - \frac{\color{blue}{x \cdot -1}}{2}\right) \]

   17. associate-/l* 99.9%

       \[\leadsto y \cdot -0.5 + \left(x \cdot \left(--1\right) - \color{blue}{x \cdot \frac{-1}{2}}\right) \]

   18. distribute-lft-out-- 99.9%

       \[\leadsto y \cdot -0.5 + \color{blue}{x \cdot \left(\left(--1\right) - \frac{-1}{2}\right)} \]

   19. metadata-eval 99.9%

       \[\leadsto y \cdot -0.5 + x \cdot \left(\color{blue}{1} - \frac{-1}{2}\right) \]

   20. metadata-eval 99.9%

       \[\leadsto y \cdot -0.5 + x \cdot \left(1 - \color{blue}{-0.5}\right) \]

   21. metadata-eval 99.9%

       \[\leadsto y \cdot -0.5 + x \cdot \color{blue}{1.5} \]

3. Simplified 99.9%

   \[\leadsto \color{blue}{y \cdot -0.5 + x \cdot 1.5} \]
4. Add Preprocessing
5. Step-by-step derivation

   1. +-commutative 99.9%

      \[\leadsto \color{blue}{x \cdot 1.5 + y \cdot -0.5} \]

   2. fma-define 100.0%

      \[\leadsto \color{blue}{\mathsf{fma}\left(x, 1.5, y \cdot -0.5\right)} \]

6. Applied egg-rr 100.0%

   \[\leadsto \color{blue}{\mathsf{fma}\left(x, 1.5, y \cdot -0.5\right)} \]
7. Add Preprocessing

Alternative 2: 74.6% accurate, 0.5× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq -6 \cdot 10^{-14} \lor \neg \left(x \leq 1.5 \cdot 10^{+31}\right):\\ \;\;\;\;x \cdot 1.5\\ \mathbf{else}:\\ \;\;\;\;y \cdot -0.5\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (or (<= x -6e-14) (not (<= x 1.5e+31))) (* x 1.5) (* y -0.5)))

C

double code(double x, double y) {
	double tmp;
	if ((x <= -6e-14) || !(x <= 1.5e+31)) {
		tmp = x * 1.5;
	} else {
		tmp = y * -0.5;
	}
	return tmp;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: tmp
    if ((x <= (-6d-14)) .or. (.not. (x <= 1.5d+31))) then
        tmp = x * 1.5d0
    else
        tmp = y * (-0.5d0)
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double tmp;
	if ((x <= -6e-14) || !(x <= 1.5e+31)) {
		tmp = x * 1.5;
	} else {
		tmp = y * -0.5;
	}
	return tmp;
}

Python

def code(x, y):
	tmp = 0
	if (x <= -6e-14) or not (x <= 1.5e+31):
		tmp = x * 1.5
	else:
		tmp = y * -0.5
	return tmp

Julia

function code(x, y)
	tmp = 0.0
	if ((x <= -6e-14) || !(x <= 1.5e+31))
		tmp = Float64(x * 1.5);
	else
		tmp = Float64(y * -0.5);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	tmp = 0.0;
	if ((x <= -6e-14) || ~((x <= 1.5e+31)))
		tmp = x * 1.5;
	else
		tmp = y * -0.5;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := If[Or[LessEqual[x, -6e-14], N[Not[LessEqual[x, 1.5e+31]], $MachinePrecision]], N[(x * 1.5), $MachinePrecision], N[(y * -0.5), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if x < -5.9999999999999997e-14 or 1.49999999999999995e31 < x

   1. Initial program 99.8%

      \[x + \frac{x - y}{2} \]
   2. Step-by-step derivation

      1. sub-neg 99.8%

         \[\leadsto x + \frac{\color{blue}{x + \left(-y\right)}}{2} \]

      2. +-commutative 99.8%

         \[\leadsto x + \frac{\color{blue}{\left(-y\right) + x}}{2} \]

      3. remove-double-neg 99.8%

         \[\leadsto x + \frac{\left(-y\right) + \color{blue}{\left(-\left(-x\right)\right)}}{2} \]

      4. unsub-neg 99.8%

         \[\leadsto x + \frac{\color{blue}{\left(-y\right) - \left(-x\right)}}{2} \]

      5. div-sub 99.8%

         \[\leadsto x + \color{blue}{\left(\frac{-y}{2} - \frac{-x}{2}\right)} \]

      6. associate-+r- 99.8%

         \[\leadsto \color{blue}{\left(x + \frac{-y}{2}\right) - \frac{-x}{2}} \]

      7. +-commutative 99.8%

         \[\leadsto \color{blue}{\left(\frac{-y}{2} + x\right)} - \frac{-x}{2} \]

      8. associate-+r- 99.8%

         \[\leadsto \color{blue}{\frac{-y}{2} + \left(x - \frac{-x}{2}\right)} \]

      9. neg-mul-1 99.8%

         \[\leadsto \frac{\color{blue}{-1 \cdot y}}{2} + \left(x - \frac{-x}{2}\right) \]

      10. *-commutative 99.8%

          \[\leadsto \frac{\color{blue}{y \cdot -1}}{2} + \left(x - \frac{-x}{2}\right) \]

      11. associate-/l* 99.8%

          \[\leadsto \color{blue}{y \cdot \frac{-1}{2}} + \left(x - \frac{-x}{2}\right) \]

      12. metadata-eval 99.8%

          \[\leadsto y \cdot \color{blue}{-0.5} + \left(x - \frac{-x}{2}\right) \]

      13. *-rgt-identity 99.8%

          \[\leadsto y \cdot -0.5 + \left(\color{blue}{x \cdot 1} - \frac{-x}{2}\right) \]

      14. metadata-eval 99.8%

          \[\leadsto y \cdot -0.5 + \left(x \cdot \color{blue}{\left(--1\right)} - \frac{-x}{2}\right) \]

      15. neg-mul-1 99.8%

          \[\leadsto y \cdot -0.5 + \left(x \cdot \left(--1\right) - \frac{\color{blue}{-1 \cdot x}}{2}\right) \]

      16. *-commutative 99.8%

          \[\leadsto y \cdot -0.5 + \left(x \cdot \left(--1\right) - \frac{\color{blue}{x \cdot -1}}{2}\right) \]

      17. associate-/l* 99.8%

          \[\leadsto y \cdot -0.5 + \left(x \cdot \left(--1\right) - \color{blue}{x \cdot \frac{-1}{2}}\right) \]

      18. distribute-lft-out-- 99.8%

          \[\leadsto y \cdot -0.5 + \color{blue}{x \cdot \left(\left(--1\right) - \frac{-1}{2}\right)} \]

      19. metadata-eval 99.8%

          \[\leadsto y \cdot -0.5 + x \cdot \left(\color{blue}{1} - \frac{-1}{2}\right) \]

      20. metadata-eval 99.8%

          \[\leadsto y \cdot -0.5 + x \cdot \left(1 - \color{blue}{-0.5}\right) \]

      21. metadata-eval 99.8%

          \[\leadsto y \cdot -0.5 + x \cdot \color{blue}{1.5} \]

   3. Simplified 99.8%

      \[\leadsto \color{blue}{y \cdot -0.5 + x \cdot 1.5} \]
   4. Add Preprocessing

   5. Taylor expanded in y around inf 77.8%

      \[\leadsto \color{blue}{y \cdot \left(1.5 \cdot \frac{x}{y} - 0.5\right)} \]

   6. Taylor expanded in y around 0 78.1%

      \[\leadsto \color{blue}{1.5 \cdot x} \]

   if -5.9999999999999997e-14 < x < 1.49999999999999995e31

   1. Initial program 100.0%

      \[x + \frac{x - y}{2} \]
   2. Step-by-step derivation

      1. sub-neg 100.0%

         \[\leadsto x + \frac{\color{blue}{x + \left(-y\right)}}{2} \]

      2. +-commutative 100.0%

         \[\leadsto x + \frac{\color{blue}{\left(-y\right) + x}}{2} \]

      3. remove-double-neg 100.0%

         \[\leadsto x + \frac{\left(-y\right) + \color{blue}{\left(-\left(-x\right)\right)}}{2} \]

      4. unsub-neg 100.0%

         \[\leadsto x + \frac{\color{blue}{\left(-y\right) - \left(-x\right)}}{2} \]

      5. div-sub 100.0%

         \[\leadsto x + \color{blue}{\left(\frac{-y}{2} - \frac{-x}{2}\right)} \]

      6. associate-+r- 100.0%

         \[\leadsto \color{blue}{\left(x + \frac{-y}{2}\right) - \frac{-x}{2}} \]

      7. +-commutative 100.0%

         \[\leadsto \color{blue}{\left(\frac{-y}{2} + x\right)} - \frac{-x}{2} \]

      8. associate-+r- 100.0%

         \[\leadsto \color{blue}{\frac{-y}{2} + \left(x - \frac{-x}{2}\right)} \]

      9. neg-mul-1 100.0%

         \[\leadsto \frac{\color{blue}{-1 \cdot y}}{2} + \left(x - \frac{-x}{2}\right) \]

      10. *-commutative 100.0%

          \[\leadsto \frac{\color{blue}{y \cdot -1}}{2} + \left(x - \frac{-x}{2}\right) \]

      11. associate-/l* 100.0%

          \[\leadsto \color{blue}{y \cdot \frac{-1}{2}} + \left(x - \frac{-x}{2}\right) \]

      12. metadata-eval 100.0%

          \[\leadsto y \cdot \color{blue}{-0.5} + \left(x - \frac{-x}{2}\right) \]

      13. *-rgt-identity 100.0%

          \[\leadsto y \cdot -0.5 + \left(\color{blue}{x \cdot 1} - \frac{-x}{2}\right) \]

      14. metadata-eval 100.0%

          \[\leadsto y \cdot -0.5 + \left(x \cdot \color{blue}{\left(--1\right)} - \frac{-x}{2}\right) \]

      15. neg-mul-1 100.0%

          \[\leadsto y \cdot -0.5 + \left(x \cdot \left(--1\right) - \frac{\color{blue}{-1 \cdot x}}{2}\right) \]

      16. *-commutative 100.0%

          \[\leadsto y \cdot -0.5 + \left(x \cdot \left(--1\right) - \frac{\color{blue}{x \cdot -1}}{2}\right) \]

      17. associate-/l* 100.0%

          \[\leadsto y \cdot -0.5 + \left(x \cdot \left(--1\right) - \color{blue}{x \cdot \frac{-1}{2}}\right) \]

      18. distribute-lft-out-- 100.0%

          \[\leadsto y \cdot -0.5 + \color{blue}{x \cdot \left(\left(--1\right) - \frac{-1}{2}\right)} \]

      19. metadata-eval 100.0%

          \[\leadsto y \cdot -0.5 + x \cdot \left(\color{blue}{1} - \frac{-1}{2}\right) \]

      20. metadata-eval 100.0%

          \[\leadsto y \cdot -0.5 + x \cdot \left(1 - \color{blue}{-0.5}\right) \]

      21. metadata-eval 100.0%

          \[\leadsto y \cdot -0.5 + x \cdot \color{blue}{1.5} \]

   3. Simplified 100.0%

      \[\leadsto \color{blue}{y \cdot -0.5 + x \cdot 1.5} \]
   4. Add Preprocessing

   5. Taylor expanded in y around inf 99.9%

      \[\leadsto \color{blue}{y \cdot \left(1.5 \cdot \frac{x}{y} - 0.5\right)} \]

   6. Taylor expanded in x around 0 79.8%

      \[\leadsto y \cdot \color{blue}{-0.5} \]
3. Recombined 2 regimes into one program.

4. Final simplification 79.0%

   \[\leadsto \begin{array}{l} \mathbf{if}\;x \leq -6 \cdot 10^{-14} \lor \neg \left(x \leq 1.5 \cdot 10^{+31}\right):\\ \;\;\;\;x \cdot 1.5\\ \mathbf{else}:\\ \;\;\;\;y \cdot -0.5\\ \end{array} \]
5. Add Preprocessing

Alternative 3: 99.9% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ x + \frac{x - y}{2} \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (+ x (/ (- x y) 2.0)))

C

double code(double x, double y) {
	return x + ((x - y) / 2.0);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = x + ((x - y) / 2.0d0)
end function

Java

public static double code(double x, double y) {
	return x + ((x - y) / 2.0);
}

Python

def code(x, y):
	return x + ((x - y) / 2.0)

Julia

function code(x, y)
	return Float64(x + Float64(Float64(x - y) / 2.0))
end

MATLAB

function tmp = code(x, y)
	tmp = x + ((x - y) / 2.0);
end

Wolfram

code[x_, y_] := N[(x + N[(N[(x - y), $MachinePrecision] / 2.0), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.9%

   \[x + \frac{x - y}{2} \]
2. Add Preprocessing
3. Add Preprocessing

Alternative 4: 50.4% accurate, 2.3× speedup

Math

\[\begin{array}{l} \\ x \cdot 1.5 \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* x 1.5))

C

double code(double x, double y) {
	return x * 1.5;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = x * 1.5d0
end function

Java

public static double code(double x, double y) {
	return x * 1.5;
}

Python

def code(x, y):
	return x * 1.5

Julia

function code(x, y)
	return Float64(x * 1.5)
end

MATLAB

function tmp = code(x, y)
	tmp = x * 1.5;
end

Wolfram

code[x_, y_] := N[(x * 1.5), $MachinePrecision]

Derivation

1. Initial program 99.9%

   \[x + \frac{x - y}{2} \]
2. Step-by-step derivation

   1. sub-neg 99.9%

      \[\leadsto x + \frac{\color{blue}{x + \left(-y\right)}}{2} \]

   2. +-commutative 99.9%

      \[\leadsto x + \frac{\color{blue}{\left(-y\right) + x}}{2} \]

   3. remove-double-neg 99.9%

      \[\leadsto x + \frac{\left(-y\right) + \color{blue}{\left(-\left(-x\right)\right)}}{2} \]

   4. unsub-neg 99.9%

      \[\leadsto x + \frac{\color{blue}{\left(-y\right) - \left(-x\right)}}{2} \]

   5. div-sub 99.9%

      \[\leadsto x + \color{blue}{\left(\frac{-y}{2} - \frac{-x}{2}\right)} \]

   6. associate-+r- 99.9%

      \[\leadsto \color{blue}{\left(x + \frac{-y}{2}\right) - \frac{-x}{2}} \]

   7. +-commutative 99.9%

      \[\leadsto \color{blue}{\left(\frac{-y}{2} + x\right)} - \frac{-x}{2} \]

   8. associate-+r- 99.9%

      \[\leadsto \color{blue}{\frac{-y}{2} + \left(x - \frac{-x}{2}\right)} \]

   9. neg-mul-1 99.9%

      \[\leadsto \frac{\color{blue}{-1 \cdot y}}{2} + \left(x - \frac{-x}{2}\right) \]

   10. *-commutative 99.9%

       \[\leadsto \frac{\color{blue}{y \cdot -1}}{2} + \left(x - \frac{-x}{2}\right) \]

   11. associate-/l* 99.9%

       \[\leadsto \color{blue}{y \cdot \frac{-1}{2}} + \left(x - \frac{-x}{2}\right) \]

   12. metadata-eval 99.9%

       \[\leadsto y \cdot \color{blue}{-0.5} + \left(x - \frac{-x}{2}\right) \]

   13. *-rgt-identity 99.9%

       \[\leadsto y \cdot -0.5 + \left(\color{blue}{x \cdot 1} - \frac{-x}{2}\right) \]

   14. metadata-eval 99.9%

       \[\leadsto y \cdot -0.5 + \left(x \cdot \color{blue}{\left(--1\right)} - \frac{-x}{2}\right) \]

   15. neg-mul-1 99.9%

       \[\leadsto y \cdot -0.5 + \left(x \cdot \left(--1\right) - \frac{\color{blue}{-1 \cdot x}}{2}\right) \]

   16. *-commutative 99.9%

       \[\leadsto y \cdot -0.5 + \left(x \cdot \left(--1\right) - \frac{\color{blue}{x \cdot -1}}{2}\right) \]

   17. associate-/l* 99.9%

       \[\leadsto y \cdot -0.5 + \left(x \cdot \left(--1\right) - \color{blue}{x \cdot \frac{-1}{2}}\right) \]

   18. distribute-lft-out-- 99.9%

       \[\leadsto y \cdot -0.5 + \color{blue}{x \cdot \left(\left(--1\right) - \frac{-1}{2}\right)} \]

   19. metadata-eval 99.9%

       \[\leadsto y \cdot -0.5 + x \cdot \left(\color{blue}{1} - \frac{-1}{2}\right) \]

   20. metadata-eval 99.9%

       \[\leadsto y \cdot -0.5 + x \cdot \left(1 - \color{blue}{-0.5}\right) \]

   21. metadata-eval 99.9%

       \[\leadsto y \cdot -0.5 + x \cdot \color{blue}{1.5} \]

3. Simplified 99.9%

   \[\leadsto \color{blue}{y \cdot -0.5 + x \cdot 1.5} \]
4. Add Preprocessing

5. Taylor expanded in y around inf 89.5%

   \[\leadsto \color{blue}{y \cdot \left(1.5 \cdot \frac{x}{y} - 0.5\right)} \]

6. Taylor expanded in y around 0 48.4%

   \[\leadsto \color{blue}{1.5 \cdot x} \]

7. Final simplification 48.4%

   \[\leadsto x \cdot 1.5 \]
8. Add Preprocessing

Developer Target 1: 99.9% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ 1.5 \cdot x - 0.5 \cdot y \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (- (* 1.5 x) (* 0.5 y)))

C

double code(double x, double y) {
	return (1.5 * x) - (0.5 * y);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = (1.5d0 * x) - (0.5d0 * y)
end function

Java

public static double code(double x, double y) {
	return (1.5 * x) - (0.5 * y);
}

Python

def code(x, y):
	return (1.5 * x) - (0.5 * y)

Julia

function code(x, y)
	return Float64(Float64(1.5 * x) - Float64(0.5 * y))
end

MATLAB

function tmp = code(x, y)
	tmp = (1.5 * x) - (0.5 * y);
end

Wolfram

code[x_, y_] := N[(N[(1.5 * x), $MachinePrecision] - N[(0.5 * y), $MachinePrecision]), $MachinePrecision]

Reproduce

herbie shell --seed 2024181 
(FPCore (x y)
  :name "Graphics.Rendering.Chart.Axis.Types:hBufferRect from Chart-1.5.3"
  :precision binary64

  :alt
  (! :herbie-platform default (- (* 3/2 x) (* 1/2 y)))

  (+ x (/ (- x y) 2.0)))