Partial Inlining
2 days ago
- #compiler-optimizations
- #inlining
- #performance
- Partial inlining allows compilers to inline only the fast path of a function while keeping the slow path as a separate call, optimizing performance without code bloat.
- The compiler splits the function into a fast path (inlined) and a slow path (outlined), maintaining correctness for all callers.
- This approach reduces function call overhead for the fast path while avoiding duplication of complex, slow computations.
- Compiler heuristics determine when to apply partial inlining, balancing performance benefits against code size costs.
- Different compilers (e.g., GCC and Clang) may make varying inlining decisions, so checking hot code paths is advisable.