
(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 (+ y (* x 2.0)))
double code(double x, double y) {
return y + (x * 2.0);
}
real(8) function code(x, y)
real(8), intent (in) :: x
real(8), intent (in) :: y
code = y + (x * 2.0d0)
end function
public static double code(double x, double y) {
return y + (x * 2.0);
}
def code(x, y): return y + (x * 2.0)
function code(x, y) return Float64(y + Float64(x * 2.0)) end
function tmp = code(x, y) tmp = y + (x * 2.0); end
code[x_, y_] := N[(y + N[(x * 2.0), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
y + x \cdot 2
\end{array}
Initial program 100.0%
+-commutativeN/A
associate-+l+N/A
+-lowering-+.f64N/A
count-2N/A
*-commutativeN/A
*-lowering-*.f64100.0%
Simplified100.0%
(FPCore (x y) :precision binary64 (if (<= x -4.2e-63) (* x 2.0) (if (<= x 1.65e+19) y (* x 2.0))))
double code(double x, double y) {
double tmp;
if (x <= -4.2e-63) {
tmp = x * 2.0;
} else if (x <= 1.65e+19) {
tmp = y;
} else {
tmp = x * 2.0;
}
return tmp;
}
real(8) function code(x, y)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8) :: tmp
if (x <= (-4.2d-63)) then
tmp = x * 2.0d0
else if (x <= 1.65d+19) then
tmp = y
else
tmp = x * 2.0d0
end if
code = tmp
end function
public static double code(double x, double y) {
double tmp;
if (x <= -4.2e-63) {
tmp = x * 2.0;
} else if (x <= 1.65e+19) {
tmp = y;
} else {
tmp = x * 2.0;
}
return tmp;
}
def code(x, y): tmp = 0 if x <= -4.2e-63: tmp = x * 2.0 elif x <= 1.65e+19: tmp = y else: tmp = x * 2.0 return tmp
function code(x, y) tmp = 0.0 if (x <= -4.2e-63) tmp = Float64(x * 2.0); elseif (x <= 1.65e+19) tmp = y; else tmp = Float64(x * 2.0); end return tmp end
function tmp_2 = code(x, y) tmp = 0.0; if (x <= -4.2e-63) tmp = x * 2.0; elseif (x <= 1.65e+19) tmp = y; else tmp = x * 2.0; end tmp_2 = tmp; end
code[x_, y_] := If[LessEqual[x, -4.2e-63], N[(x * 2.0), $MachinePrecision], If[LessEqual[x, 1.65e+19], y, N[(x * 2.0), $MachinePrecision]]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;x \leq -4.2 \cdot 10^{-63}:\\
\;\;\;\;x \cdot 2\\
\mathbf{elif}\;x \leq 1.65 \cdot 10^{+19}:\\
\;\;\;\;y\\
\mathbf{else}:\\
\;\;\;\;x \cdot 2\\
\end{array}
\end{array}
if x < -4.2e-63 or 1.65e19 < x Initial program 100.0%
+-commutativeN/A
associate-+l+N/A
+-lowering-+.f64N/A
count-2N/A
*-commutativeN/A
*-lowering-*.f64100.0%
Simplified100.0%
Taylor expanded in y around 0
*-lowering-*.f6480.6%
Simplified80.6%
if -4.2e-63 < x < 1.65e19Initial program 100.0%
+-commutativeN/A
associate-+l+N/A
+-lowering-+.f64N/A
count-2N/A
*-commutativeN/A
*-lowering-*.f64100.0%
Simplified100.0%
Taylor expanded in y around inf
Simplified78.0%
Final simplification79.4%
(FPCore (x y) :precision binary64 y)
double code(double x, double y) {
return y;
}
real(8) function code(x, y)
real(8), intent (in) :: x
real(8), intent (in) :: y
code = y
end function
public static double code(double x, double y) {
return y;
}
def code(x, y): return y
function code(x, y) return y end
function tmp = code(x, y) tmp = y; end
code[x_, y_] := y
\begin{array}{l}
\\
y
\end{array}
Initial program 100.0%
+-commutativeN/A
associate-+l+N/A
+-lowering-+.f64N/A
count-2N/A
*-commutativeN/A
*-lowering-*.f64100.0%
Simplified100.0%
Taylor expanded in y around inf
Simplified46.6%
(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 2024161
(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))