Using GCC Profile-Guided Optimization to Boost Runtime Performance
Learn how to enable GCC's profile-guided optimization with -fprofile-generate and -fprofile-use, see a simple example, and avoid common pitfalls.
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Using GCC Profile-Guided Optimization to Speed Up Real‑World Workloads
Learn how GCC’s PGO lets the compiler reorder code and inline functions based on actual execution data, giving measurable speedups without source changes.
Does LLVM's LoopVectorize pass re‑evaluate its cost model after profile‑guided optimization marks a function hot or cold?
LLVM’s LoopVectorize pass decides whether to vectorize a loop based on a cost model that evaluates trip count, memory stride, alignment, and target‑specific vector width. The model is consulted during the pass’s execution, which typically runs before profile‑guided optimization (PGO) marks functions as hot or cold. After PGO, the optimizer may reorder or re‑
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