SynthBasics:oscSampleBasedAux from YampaSynth-0.2

Average Error: 0.0 → 0.0

Time: 3.3s

Precision: binary64

Cost: 6720

Math

\[x + y \cdot \left(z - x\right) \]

↓

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

FPCore

(FPCore (x y z) :precision binary64 (+ x (* y (- z x))))

↓

(FPCore (x y z) :precision binary64 (fma y (- z x) x))

C

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

↓

double code(double x, double y, double z) {
	return fma(y, (z - x), x);
}

Julia

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

↓

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

Wolfram

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

↓

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

Derivation

1. Initial program 0.0

   \[x + y \cdot \left(z - x\right) \]

2. Simplified 0.0

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

   [Start] 0.0	\[ x + y \cdot \left(z - x\right) \]
   +-commutative [=>] 0.0	\[ \color{blue}{y \cdot \left(z - x\right) + x} \]
   fma-def [=>] 0.0	\[ \color{blue}{\mathsf{fma}\left(y, z - x, x\right)} \]

3. Final simplification 0.0

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

Alternatives

Alternative 1
Error	16.9
Cost	850

\[\begin{array}{l} \mathbf{if}\;x \leq -1.65 \cdot 10^{-34} \lor \neg \left(x \leq -1.1 \cdot 10^{-112}\right) \land \left(x \leq -2.7 \cdot 10^{-140} \lor \neg \left(x \leq 7 \cdot 10^{-184}\right)\right):\\ \;\;\;\;x \cdot \left(1 - y\right)\\ \mathbf{else}:\\ \;\;\;\;y \cdot z\\ \end{array} \]

Alternative 2
Error	24.1
Cost	784

\[\begin{array}{l} \mathbf{if}\;y \leq -4.4 \cdot 10^{-85}:\\ \;\;\;\;y \cdot z\\ \mathbf{elif}\;y \leq 1.65 \cdot 10^{-24}:\\ \;\;\;\;x\\ \mathbf{elif}\;y \leq 2.5 \cdot 10^{+91}:\\ \;\;\;\;y \cdot z\\ \mathbf{elif}\;y \leq 1.25 \cdot 10^{+229}:\\ \;\;\;\;x \cdot \left(-y\right)\\ \mathbf{else}:\\ \;\;\;\;y \cdot z\\ \end{array} \]

Alternative 3
Error	12.9
Cost	585

\[\begin{array}{l} \mathbf{if}\;y \leq -4.5 \cdot 10^{-88} \lor \neg \left(y \leq 1.7 \cdot 10^{-26}\right):\\ \;\;\;\;y \cdot \left(z - x\right)\\ \mathbf{else}:\\ \;\;\;\;x \cdot \left(1 - y\right)\\ \end{array} \]

Alternative 4
Error	24.2
Cost	456

\[\begin{array}{l} \mathbf{if}\;y \leq -3.1 \cdot 10^{-94}:\\ \;\;\;\;y \cdot z\\ \mathbf{elif}\;y \leq 1.85 \cdot 10^{-25}:\\ \;\;\;\;x\\ \mathbf{else}:\\ \;\;\;\;y \cdot z\\ \end{array} \]

Alternative 5
Error	0.0
Cost	448

\[x + y \cdot \left(z - x\right) \]

Alternative 6
Error	34.7
Cost	64

\[x \]

Reproduce

herbie shell --seed 2022364 
(FPCore (x y z)
  :name "SynthBasics:oscSampleBasedAux from YampaSynth-0.2"
  :precision binary64
  (+ x (* y (- z x))))