Diagrams.ThreeD.Transform:aboutX from diagrams-lib-1.3.0.3, B

?

Percentage Accurate: 99.8% → 99.8%

Time: 9.0s

Precision: binary64

Cost: 19520

?

\[x \cdot \sin y + z \cdot \cos y \]

↓

\[\mathsf{fma}\left(x, \sin y, z \cdot \cos y\right) \]

(FPCore (x y z) :precision binary64 (+ (* x (sin y)) (* z (cos y))))

↓

(FPCore (x y z) :precision binary64 (fma x (sin y) (* z (cos y))))

double code(double x, double y, double z) {
	return (x * sin(y)) + (z * cos(y));
}

↓

double code(double x, double y, double z) {
	return fma(x, sin(y), (z * cos(y)));
}

function code(x, y, z)
	return Float64(Float64(x * sin(y)) + Float64(z * cos(y)))
end

↓

function code(x, y, z)
	return fma(x, sin(y), Float64(z * cos(y)))
end

code[x_, y_, z_] := N[(N[(x * N[Sin[y], $MachinePrecision]), $MachinePrecision] + N[(z * N[Cos[y], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

↓

code[x_, y_, z_] := N[(x * N[Sin[y], $MachinePrecision] + N[(z * N[Cos[y], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

x \cdot \sin y + z \cdot \cos y

↓

\mathsf{fma}\left(x, \sin y, z \cdot \cos y\right)

Local Percentage Accuracy vs ?

The average percentage accuracy by input value. Horizontal axis shows value of an input variable; the variable is choosen in the title. Vertical axis is accuracy; higher is better. Red represent the original program, while blue represents Herbie's suggestion. These can be toggled with buttons below the plot. The line is an average while dots represent individual samples.

Herbie found 9 alternatives:

Alternative	Accuracy	Speedup

Accuracy vs Speed

The accuracy (vertical axis) and speed (horizontal axis) of each alternatives. Up and to the right is better. The red square shows the initial program, and each blue circle shows an alternative.The line shows the best available speed-accuracy tradeoffs.

Bogosity?

Bogosity

Derivation?

Initial program 99.8%
\[x \cdot \sin y + z \cdot \cos y \]
Simplified99.8%
\[\leadsto \color{blue}{\mathsf{fma}\left(x, \sin y, z \cdot \cos y\right)} \]
Step-by-step derivation
[Start]99.8%
\[ x \cdot \sin y + z \cdot \cos y \]
fma-def [=>]99.8%
\[ \color{blue}{\mathsf{fma}\left(x, \sin y, z \cdot \cos y\right)} \]
Final simplification99.8%
\[\leadsto \mathsf{fma}\left(x, \sin y, z \cdot \cos y\right) \]

[Start]99.8%	\[ x \cdot \sin y + z \cdot \cos y \]
fma-def [=>]99.8%	\[ \color{blue}{\mathsf{fma}\left(x, \sin y, z \cdot \cos y\right)} \]

Alternatives

Alternative 1
Accuracy	99.8%
Cost	19520

\[\mathsf{fma}\left(x, \sin y, z \cdot \cos y\right) \]

Alternative 2
Accuracy	99.8%
Cost	13248

\[z \cdot \cos y + x \cdot \sin y \]

Alternative 3
Accuracy	74.5%
Cost	7121

\[\begin{array}{l} t_0 := z \cdot \cos y\\ \mathbf{if}\;z \leq -2.3 \cdot 10^{-52}:\\ \;\;\;\;t_0\\ \mathbf{elif}\;z \leq -3.7 \cdot 10^{-141}:\\ \;\;\;\;z + x \cdot y\\ \mathbf{elif}\;z \leq -4 \cdot 10^{-143} \lor \neg \left(z \leq 3.7 \cdot 10^{-125}\right):\\ \;\;\;\;t_0\\ \mathbf{else}:\\ \;\;\;\;x \cdot \sin y\\ \end{array} \]

Alternative 4
Accuracy	74.5%
Cost	7121

\[\begin{array}{l} t_0 := z \cdot \cos y\\ \mathbf{if}\;z \leq -6.8 \cdot 10^{-54}:\\ \;\;\;\;t_0\\ \mathbf{elif}\;z \leq -6.5 \cdot 10^{-141}:\\ \;\;\;\;\mathsf{fma}\left(y, x, z\right)\\ \mathbf{elif}\;z \leq -7 \cdot 10^{-143} \lor \neg \left(z \leq 6.2 \cdot 10^{-125}\right):\\ \;\;\;\;t_0\\ \mathbf{else}:\\ \;\;\;\;x \cdot \sin y\\ \end{array} \]

Alternative 5
Accuracy	85.9%
Cost	6985

\[\begin{array}{l} \mathbf{if}\;x \leq -1.25 \cdot 10^{-83} \lor \neg \left(x \leq 5.5 \cdot 10^{-149}\right):\\ \;\;\;\;z + x \cdot \sin y\\ \mathbf{else}:\\ \;\;\;\;z \cdot \cos y\\ \end{array} \]

Alternative 6
Accuracy	74.6%
Cost	6857

\[\begin{array}{l} \mathbf{if}\;y \leq -0.06 \lor \neg \left(y \leq 1650\right):\\ \;\;\;\;z \cdot \cos y\\ \mathbf{else}:\\ \;\;\;\;\left(z + x \cdot y\right) + -0.5 \cdot \left(z \cdot \left(y \cdot y\right)\right)\\ \end{array} \]

Alternative 7
Accuracy	42.2%
Cost	456

\[\begin{array}{l} \mathbf{if}\;z \leq -5.1 \cdot 10^{-145}:\\ \;\;\;\;z\\ \mathbf{elif}\;z \leq 2.6 \cdot 10^{-125}:\\ \;\;\;\;x \cdot y\\ \mathbf{else}:\\ \;\;\;\;z\\ \end{array} \]

Alternative 8
Accuracy	52.7%
Cost	320

\[z + x \cdot y \]

Alternative 9
Accuracy	39.4%
Cost	64

\[z \]

Reproduce?

herbie shell --seed 2023271 
(FPCore (x y z)
  :name "Diagrams.ThreeD.Transform:aboutX from diagrams-lib-1.3.0.3, B"
  :precision binary64
  (+ (* x (sin y)) (* z (cos y))))