3. Optimizations

• 3.1. GHC Flags
  • 3.1.1. GHC Flags
• 3.2. GHC Optimizations
  • 3.2.1. Defunctionalization
  • 3.2.2. The Static Arguments Transformation
  • 3.2.3. Lambda Lifting
    • 3.2.3.1. A Working Example
    • 3.2.3.2. How Lambda Lifting Works in GHC
    • 3.2.3.3. Observing the Effect of Lambda Lifting
    • 3.2.3.4. When to Manually Lambda Lift
    • 3.2.3.5. Summary
  • 3.2.4. Loopification
  • 3.2.5. Manual Worker/Wrapper
• 3.3. Library Based Changes
  • 3.3.1. Lower Impedance with Better Data Structures
• 3.4. Library Agnostic Changes
  • 3.4.1. Ordering Data Constructors
  • 3.4.2. Wrangling Lazy Tuples
  • 3.4.3. Appropriate Folding
  • 3.4.4. Avoid Runtime Checks with Parse Don’t Validate:
  • 3.4.5. Using GHC.Exts
  • 3.4.6. Inlining Pragma and Friends
  • 3.4.7. Specialization
  • 3.4.8. Fusion and Rules
  • 3.4.9. Unboxing
  • 3.4.10. Unpacked Product Types
  • 3.4.11. Avoiding Nested Monad Transformers
  • 3.4.12. Unroll Monad Transformer Stacks
  • 3.4.13. The OneShot Monad Trick
  • 3.4.14. Continuation Passing Style
  • 3.4.15. Using Levity Polymorphism
  • 3.4.16. Using Backpack to Unroll Data Structures