
(FPCore (x y) :precision binary64 (+ (+ x y) x))
double code(double x, double y) {
return (x + y) + x;
}
real(8) function code(x, y)
real(8), intent (in) :: x
real(8), intent (in) :: y
code = (x + y) + x
end function
public static double code(double x, double y) {
return (x + y) + x;
}
def code(x, y): return (x + y) + x
function code(x, y) return Float64(Float64(x + y) + x) end
function tmp = code(x, y) tmp = (x + y) + x; end
code[x_, y_] := N[(N[(x + y), $MachinePrecision] + x), $MachinePrecision]
\begin{array}{l}
\\
\left(x + y\right) + x
\end{array}
Sampling outcomes in binary64 precision:
Herbie found 3 alternatives:
| Alternative | Accuracy | Speedup |
|---|
(FPCore (x y) :precision binary64 (+ (+ x y) x))
double code(double x, double y) {
return (x + y) + x;
}
real(8) function code(x, y)
real(8), intent (in) :: x
real(8), intent (in) :: y
code = (x + y) + x
end function
public static double code(double x, double y) {
return (x + y) + x;
}
def code(x, y): return (x + y) + x
function code(x, y) return Float64(Float64(x + y) + x) end
function tmp = code(x, y) tmp = (x + y) + x; end
code[x_, y_] := N[(N[(x + y), $MachinePrecision] + x), $MachinePrecision]
\begin{array}{l}
\\
\left(x + y\right) + x
\end{array}
(FPCore (x y) :precision binary64 (fma 2.0 x y))
double code(double x, double y) {
return fma(2.0, x, y);
}
function code(x, y) return fma(2.0, x, y) end
code[x_, y_] := N[(2.0 * x + y), $MachinePrecision]
\begin{array}{l}
\\
\mathsf{fma}\left(2, x, y\right)
\end{array}
Initial program 99.9%
lift-+.f64N/A
+-commutativeN/A
lift-+.f64N/A
associate-+r+N/A
count-2N/A
lower-fma.f64100.0
Applied rewrites100.0%
(FPCore (x y) :precision binary64 (+ x (+ x y)))
double code(double x, double y) {
return x + (x + y);
}
real(8) function code(x, y)
real(8), intent (in) :: x
real(8), intent (in) :: y
code = x + (x + y)
end function
public static double code(double x, double y) {
return x + (x + y);
}
def code(x, y): return x + (x + y)
function code(x, y) return Float64(x + Float64(x + y)) end
function tmp = code(x, y) tmp = x + (x + y); end
code[x_, y_] := N[(x + N[(x + y), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
x + \left(x + y\right)
\end{array}
Initial program 99.9%
Final simplification99.9%
(FPCore (x y) :precision binary64 (+ x x))
double code(double x, double y) {
return x + x;
}
real(8) function code(x, y)
real(8), intent (in) :: x
real(8), intent (in) :: y
code = x + x
end function
public static double code(double x, double y) {
return x + x;
}
def code(x, y): return x + x
function code(x, y) return Float64(x + x) end
function tmp = code(x, y) tmp = x + x; end
code[x_, y_] := N[(x + x), $MachinePrecision]
\begin{array}{l}
\\
x + x
\end{array}
Initial program 99.9%
Taylor expanded in x around inf
*-rgt-identityN/A
*-inversesN/A
associate-/l*N/A
*-commutativeN/A
associate-*l*N/A
associate-/l*N/A
associate-*l/N/A
lower-*.f64N/A
associate-*l/N/A
*-rgt-identityN/A
*-inversesN/A
associate-/l*N/A
associate-/r/N/A
associate-*l/N/A
associate-*r*N/A
associate-/l*N/A
*-inversesN/A
metadata-eval53.1
Applied rewrites53.1%
Applied rewrites53.1%
(FPCore (x y) :precision binary64 (+ y (* 2.0 x)))
double code(double x, double y) {
return y + (2.0 * x);
}
real(8) function code(x, y)
real(8), intent (in) :: x
real(8), intent (in) :: y
code = y + (2.0d0 * x)
end function
public static double code(double x, double y) {
return y + (2.0 * x);
}
def code(x, y): return y + (2.0 * x)
function code(x, y) return Float64(y + Float64(2.0 * x)) end
function tmp = code(x, y) tmp = y + (2.0 * x); end
code[x_, y_] := N[(y + N[(2.0 * x), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
y + 2 \cdot x
\end{array}
herbie shell --seed 2024234
(FPCore (x y)
:name "Graphics.Rendering.Plot.Render.Plot.Legend:renderLegendOutside from plot-0.2.3.4, A"
:precision binary64
:alt
(! :herbie-platform default (+ y (* 2 x)))
(+ (+ x y) x))