Profile-Guided Optimization in the Go Compiler
summary
Adds end-to-end Profile-Guided Optimization to the Go toolchain by ingesting pprof protobuf format profiles in the frontend, carrying weights through SSA, and applying profile-guided inlining, code specialization, basic-block layout and function reordering in the backend and linker. Benchmarks show concrete wins—about 10% improvement in microbenchmarks where previously-uninlined hot callees become inlineable—while LLVM-style gains are cited at 15–30%. The inlining patch is upstream at https://go-review.googlesource.com/c/go/+/429863.
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