Average Error: 0.0 → 0.0
Time: 3.3s
Precision: binary64
Cost: 6784
\[x \cdot y - z \cdot t \]
↓
\[\mathsf{fma}\left(y, x, z \cdot \left(-t\right)\right) \]
(FPCore (x y z t) :precision binary64 (- (* x y) (* z t)))
↓
(FPCore (x y z t) :precision binary64 (fma y x (* z (- t))))
double code(double x, double y, double z, double t) {
	return (x * y) - (z * t);
}
↓
double code(double x, double y, double z, double t) {
	return fma(y, x, (z * -t));
}

function code(x, y, z, t)
	return Float64(Float64(x * y) - Float64(z * t))
end
↓
function code(x, y, z, t)
	return fma(y, x, Float64(z * Float64(-t)))
end

code[x_, y_, z_, t_] := N[(N[(x * y), $MachinePrecision] - N[(z * t), $MachinePrecision]), $MachinePrecision]
↓
code[x_, y_, z_, t_] := N[(y * x + N[(z * (-t)), $MachinePrecision]), $MachinePrecision]

x \cdot y - z \cdot t
↓
\mathsf{fma}\left(y, x, z \cdot \left(-t\right)\right)

Error

Derivation

  1. Initial program 0.0

    \[x \cdot y - z \cdot t \]

  2. Applied egg-rr0.0

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

  3. Final simplification0.0

    \[\leadsto \mathsf{fma}\left(y, x, z \cdot \left(-t\right)\right) \]

Alternatives

Alternative 1
Error21.3
Cost1051
\[\begin{array}{l} \mathbf{if}\;y \leq -4.7 \cdot 10^{-53} \lor \neg \left(y \leq 2.3 \cdot 10^{-110}\right) \land \left(y \leq 9 \cdot 10^{-76} \lor \neg \left(y \leq 10^{-51}\right) \land \left(y \leq 2.8 \cdot 10^{+135} \lor \neg \left(y \leq 1.9 \cdot 10^{+159}\right)\right)\right):\\ \;\;\;\;y \cdot x\\ \mathbf{else}:\\ \;\;\;\;z \cdot \left(-t\right)\\ \end{array} \]
Alternative 2
Error0.0
Cost832
\[-2 \cdot \left(z \cdot t\right) + \left(z \cdot t + y \cdot x\right) \]
Alternative 3
Error0.0
Cost448
\[y \cdot x - z \cdot t \]
Alternative 4
Error30.7
Cost192
\[y \cdot x \]

Error

Reproduce

herbie shell --seed 2022343 
(FPCore (x y z t)
  :name "Linear.V3:cross from linear-1.19.1.3"
  :precision binary64
  (- (* x y) (* z t)))