Average Error: 45.4 → 31.2
Time: 52.1s
Precision: 64
Internal Precision: 2432
\[(x \cdot y + z)_* - \left(1 + \left(x \cdot y + z\right)\right)\]
\[\left((x \cdot y + z)_* - z\right) - \sqrt[3]{{\left(1 + x \cdot y\right)}^{3}}\]

Error

Bits error versus x

Bits error versus y

Bits error versus z

Target

Original45.4
Target0
Herbie31.2
\[-1\]

Derivation

  1. Initial program 45.4

    \[(x \cdot y + z)_* - \left(1 + \left(x \cdot y + z\right)\right)\]
  2. Using strategy rm
  3. Applied add-cube-cbrt45.4

    \[\leadsto \color{blue}{\left(\sqrt[3]{(x \cdot y + z)_* - \left(1 + \left(x \cdot y + z\right)\right)} \cdot \sqrt[3]{(x \cdot y + z)_* - \left(1 + \left(x \cdot y + z\right)\right)}\right) \cdot \sqrt[3]{(x \cdot y + z)_* - \left(1 + \left(x \cdot y + z\right)\right)}}\]
  4. Taylor expanded around 0 45.4

    \[\leadsto \left(\sqrt[3]{(x \cdot y + z)_* - \left(1 + \left(x \cdot y + z\right)\right)} \cdot \sqrt[3]{\color{blue}{(x \cdot y + z)_* - \left(z + \left(1 + y \cdot x\right)\right)}}\right) \cdot \sqrt[3]{(x \cdot y + z)_* - \left(1 + \left(x \cdot y + z\right)\right)}\]
  5. Applied simplify30.9

    \[\leadsto \color{blue}{\left((x \cdot y + z)_* - z\right) - \left(1 + y \cdot x\right)}\]
  6. Using strategy rm
  7. Applied add-cbrt-cube31.2

    \[\leadsto \left((x \cdot y + z)_* - z\right) - \color{blue}{\sqrt[3]{\left(\left(1 + y \cdot x\right) \cdot \left(1 + y \cdot x\right)\right) \cdot \left(1 + y \cdot x\right)}}\]
  8. Applied simplify31.2

    \[\leadsto \left((x \cdot y + z)_* - z\right) - \sqrt[3]{\color{blue}{{\left(1 + x \cdot y\right)}^{3}}}\]
  9. Removed slow pow expressions.

Runtime

Time bar (total: 52.1s)Debug logProfile

herbie shell --seed '#(1063282112 2455465480 4141627379 3773598652 1647277307 776739644)' 
(FPCore (x y z)
  :name "simple fma test"

  :herbie-target
  -1

  (- (fma x y z) (+ 1 (+ (* x y) z))))