Average Error: 28.8 → 29.0
Time: 25.9s
Precision: 64
Internal Precision: 640
\[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c}}{3 \cdot a}\]
\[\frac{\left(-b\right) + \frac{\sqrt{\left(b \cdot b - c \cdot \left(3 \cdot a\right)\right) \cdot \left(b \cdot b + c \cdot \left(3 \cdot a\right)\right)}}{\sqrt{\left(a \cdot c\right) \cdot 3 + b \cdot b}}}{3 \cdot a}\]

Error

Bits error versus a

Bits error versus b

Bits error versus c

Bits error versus d

Derivation

  1. Initial program 28.8

    \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c}}{3 \cdot a}\]
  2. Using strategy rm
  3. Applied add-log-exp40.7

    \[\leadsto \frac{\left(-b\right) + \sqrt{b \cdot b - \color{blue}{\log \left(e^{\left(3 \cdot a\right) \cdot c}\right)}}}{3 \cdot a}\]
  4. Using strategy rm
  5. Applied flip--40.7

    \[\leadsto \frac{\left(-b\right) + \sqrt{\color{blue}{\frac{\left(b \cdot b\right) \cdot \left(b \cdot b\right) - \log \left(e^{\left(3 \cdot a\right) \cdot c}\right) \cdot \log \left(e^{\left(3 \cdot a\right) \cdot c}\right)}{b \cdot b + \log \left(e^{\left(3 \cdot a\right) \cdot c}\right)}}}}{3 \cdot a}\]
  6. Applied sqrt-div40.8

    \[\leadsto \frac{\left(-b\right) + \color{blue}{\frac{\sqrt{\left(b \cdot b\right) \cdot \left(b \cdot b\right) - \log \left(e^{\left(3 \cdot a\right) \cdot c}\right) \cdot \log \left(e^{\left(3 \cdot a\right) \cdot c}\right)}}{\sqrt{b \cdot b + \log \left(e^{\left(3 \cdot a\right) \cdot c}\right)}}}}{3 \cdot a}\]
  7. Applied simplify39.1

    \[\leadsto \frac{\left(-b\right) + \frac{\color{blue}{\sqrt{\left(b \cdot b - c \cdot \left(3 \cdot a\right)\right) \cdot \left(b \cdot b + c \cdot \left(3 \cdot a\right)\right)}}}{\sqrt{b \cdot b + \log \left(e^{\left(3 \cdot a\right) \cdot c}\right)}}}{3 \cdot a}\]
  8. Applied simplify29.0

    \[\leadsto \frac{\left(-b\right) + \frac{\sqrt{\left(b \cdot b - c \cdot \left(3 \cdot a\right)\right) \cdot \left(b \cdot b + c \cdot \left(3 \cdot a\right)\right)}}{\color{blue}{\sqrt{\left(a \cdot c\right) \cdot 3 + b \cdot b}}}}{3 \cdot a}\]

Runtime

Time bar (total: 25.9s)Debug logProfile

herbie shell --seed '#(1070355188 2193211668 3977393919 3454156579 3755371326 1656365382)' 
(FPCore (a b c d)
  :name "Cubic critical, narrow range"
  :pre (and (< 1.0536712127723509e-08 a 94906265.62425156) (< 1.0536712127723509e-08 b 94906265.62425156) (< 1.0536712127723509e-08 c 94906265.62425156))
  (/ (+ (- b) (sqrt (- (* b b) (* (* 3 a) c)))) (* 3 a)))