\[\left(\left(\log \left(x + y\right) + \log z\right) - t\right) + \left(a - 0.5\right) \cdot \log t\]

↓

\[\left(\log \left(x + y\right) + (\left(a - 0.5\right) \cdot \left(\log t\right) + \left(\log z\right))_*\right) + \left(-t\right)\]

Error

The X axis uses an exponential scale — Bits error versus `x`

Derivation

Initial program 0.3
\[\left(\left(\log \left(x + y\right) + \log z\right) - t\right) + \left(a - 0.5\right) \cdot \log t\]
Initial simplification0.3
\[\leadsto \log \left(y + x\right) + \left((\left(a - 0.5\right) \cdot \left(\log t\right) + \left(\log z\right))_* - t\right)\]
Using strategy rm
Applied sub-neg0.3
\[\leadsto \log \left(y + x\right) + \color{blue}{\left((\left(a - 0.5\right) \cdot \left(\log t\right) + \left(\log z\right))_* + \left(-t\right)\right)}\]
Applied associate-+r+0.3
\[\leadsto \color{blue}{\left(\log \left(y + x\right) + (\left(a - 0.5\right) \cdot \left(\log t\right) + \left(\log z\right))_*\right) + \left(-t\right)}\]
Final simplification0.3
\[\leadsto \left(\log \left(x + y\right) + (\left(a - 0.5\right) \cdot \left(\log t\right) + \left(\log z\right))_*\right) + \left(-t\right)\]

Runtime

herbie shell --seed 2018220 +o rules:numerics
(FPCore (x y z t a)
  :name "Numeric.SpecFunctions:logGammaL from math-functions-0.1.5.2"
  (+ (- (+ (log (+ x y)) (log z)) t) (* (- a 0.5) (log t))))