[llvm-bugs] [Bug 218248] [MachineBlockPlacement][X86] -O2 slower than -O1 on CSV parse loop (Zen 5): branch misses ~2.6×

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Sun Aug 23 08:20:15 PDT 2026

Previous message: [llvm-bugs] [Bug 218246] C++20 modules: placement-new reachability fix from #59601/D141023 doesn't cover the combined single-invocation `-fmodule-output=` build mode (and the same gap affects `std::views::reverse`)
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