Average Error: 0.1 → 0.1
Time: 5.5s
Precision: binary64
\[0 \leq e \land e \leq 1\]
\[\frac{e \cdot \sin v}{1 + e \cdot \cos v} \]
↓
\[e \cdot \frac{\sin v}{\mathsf{fma}\left(e, \cos v, 1\right)} \]
\frac{e \cdot \sin v}{1 + e \cdot \cos v}
↓
e \cdot \frac{\sin v}{\mathsf{fma}\left(e, \cos v, 1\right)}

(FPCore (e v) :precision binary64 (/ (* e (sin v)) (+ 1.0 (* e (cos v)))))
↓
(FPCore (e v) :precision binary64 (* e (/ (sin v) (fma e (cos v) 1.0))))
double code(double e, double v) {
	return (e * sin(v)) / (1.0 + (e * cos(v)));
}
↓
double code(double e, double v) {
	return e * (sin(v) / fma(e, cos(v), 1.0));
}

Error

Bits error versus e

Bits error versus v

Derivation

  1. Initial program 0.1

    \[\frac{e \cdot \sin v}{1 + e \cdot \cos v} \]

  2. Simplified0.1

    \[\leadsto \color{blue}{\frac{e \cdot \sin v}{\mathsf{fma}\left(e, \cos v, 1\right)}} \]

  3. Applied associate-/l*_binary640.3

    \[\leadsto \color{blue}{\frac{e}{\frac{\mathsf{fma}\left(e, \cos v, 1\right)}{\sin v}}} \]

  4. Applied add-sqr-sqrt_binary640.5

    \[\leadsto \frac{\color{blue}{\sqrt{e} \cdot \sqrt{e}}}{\frac{\mathsf{fma}\left(e, \cos v, 1\right)}{\sin v}} \]

  5. Applied associate-/l*_binary640.5

    \[\leadsto \color{blue}{\frac{\sqrt{e}}{\frac{\frac{\mathsf{fma}\left(e, \cos v, 1\right)}{\sin v}}{\sqrt{e}}}} \]

  6. Applied div-inv_binary640.5

    \[\leadsto \frac{\sqrt{e}}{\color{blue}{\frac{\mathsf{fma}\left(e, \cos v, 1\right)}{\sin v} \cdot \frac{1}{\sqrt{e}}}} \]

  7. Applied *-un-lft-identity_binary640.5

    \[\leadsto \frac{\sqrt{\color{blue}{1 \cdot e}}}{\frac{\mathsf{fma}\left(e, \cos v, 1\right)}{\sin v} \cdot \frac{1}{\sqrt{e}}} \]

  8. Applied sqrt-prod_binary640.5

    \[\leadsto \frac{\color{blue}{\sqrt{1} \cdot \sqrt{e}}}{\frac{\mathsf{fma}\left(e, \cos v, 1\right)}{\sin v} \cdot \frac{1}{\sqrt{e}}} \]

  9. Applied times-frac_binary640.5

    \[\leadsto \color{blue}{\frac{\sqrt{1}}{\frac{\mathsf{fma}\left(e, \cos v, 1\right)}{\sin v}} \cdot \frac{\sqrt{e}}{\frac{1}{\sqrt{e}}}} \]

  10. Simplified0.4

    \[\leadsto \color{blue}{\frac{\sin v}{\mathsf{fma}\left(e, \cos v, 1\right)}} \cdot \frac{\sqrt{e}}{\frac{1}{\sqrt{e}}} \]

  11. Simplified0.1

    \[\leadsto \frac{\sin v}{\mathsf{fma}\left(e, \cos v, 1\right)} \cdot \color{blue}{e} \]

  12. Final simplification0.1

    \[\leadsto e \cdot \frac{\sin v}{\mathsf{fma}\left(e, \cos v, 1\right)} \]

Reproduce

herbie shell --seed 2022082 
(FPCore (e v)
  :name "Trigonometry A"
  :precision binary64
  :pre (and (<= 0.0 e) (<= e 1.0))
  (/ (* e (sin v)) (+ 1.0 (* e (cos v)))))