Average Error: 30.4 → 0.2
Time: 12.8s
Precision: 64
Internal Precision: 1344
\[\sqrt{x + 1} - \sqrt{x}\]
↓
\[(e^{\log_* (1 + \frac{1}{\sqrt{x + 1} + \sqrt{x}})} - 1)^*\]

Error

Bits error versus x

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Results

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Target

Original30.4
Target0.2
Herbie0.2
\[\frac{1}{\sqrt{x + 1} + \sqrt{x}}\]

Derivation

  1. Initial program 30.4

    \[\sqrt{x + 1} - \sqrt{x}\]

  2. Initial simplification30.4

    \[\leadsto \sqrt{1 + x} - \sqrt{x}\]
  3. Using strategy rm

  4. Applied flip--30.2

    \[\leadsto \color{blue}{\frac{\sqrt{1 + x} \cdot \sqrt{1 + x} - \sqrt{x} \cdot \sqrt{x}}{\sqrt{1 + x} + \sqrt{x}}}\]

  5. Taylor expanded around 0 0.2

    \[\leadsto \frac{\color{blue}{1}}{\sqrt{1 + x} + \sqrt{x}}\]
  6. Using strategy rm

  7. Applied expm1-log1p-u0.2

    \[\leadsto \color{blue}{(e^{\log_* (1 + \frac{1}{\sqrt{1 + x} + \sqrt{x}})} - 1)^*}\]

  8. Final simplification0.2

    \[\leadsto (e^{\log_* (1 + \frac{1}{\sqrt{x + 1} + \sqrt{x}})} - 1)^*\]

Runtime

Time bar (total: 12.8s)Debug logProfile

BaselineHerbieOracleSpan%
Regimes0.20.20.10.10%
herbie shell --seed 2018286 +o rules:numerics
(FPCore (x)
  :name "2sqrt (example 3.1)"

  :herbie-target
  (/ 1 (+ (sqrt (+ x 1)) (sqrt x)))

  (- (sqrt (+ x 1)) (sqrt x)))