C++20's Likely Attribute - Optimizations, Pessimizations, and Unlikely Consequences

C++20's Likely Attribute - Optimizations, Pessimizations, and Unlikely Consequences

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Introduction

1 of 26

1 of 26

Introduction

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Classroom Contents

C++20's Likely Attribute - Optimizations, Pessimizations, and Unlikely Consequences

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  1. 1 Introduction
  2. 2 Why do we need it
  3. 3 Code Layout
  4. 4 Bench Predictor
  5. 5 CPU Predictor
  6. 6 Cold Branch
  7. 7 Indirect Branch
  8. 8 Likely vs unlikely
  9. 9 Early return
  10. 10 Exceptions
  11. 11 Likely unlikely macro
  12. 12 Actual Benchmark
  13. 13 Comparison
  14. 14 The Benchmark
  15. 15 The Result
  16. 16 Switching Order of Declaration
  17. 17 Why are they the same
  18. 18 Benchmark
  19. 19 Perf
  20. 20 Summary
  21. 21 Questions
  22. 22 Syntax placement
  23. 23 If is unlikely
  24. 24 Bad Hints
  25. 25 Predictors
  26. 26 Not Optimal

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