On "simple" Optimizations
summary
Uses Compiler Explorer to show clang and GCC generating huge code for four push_backs then collapsing to a simple sum only after adding v.reserve(4) or running extra LLVM passes. Claims and shows that the issue is the inliner and optimizer behavior not the idea of examples — LLVM inlines three but not four functions so a call remains unless capacity is reserved or extra optimization iterations are forced, and the live demo proves the surprising numeric cutoff.
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