It has been over a year since the last check of the LLVM project with PVS-Studio, and in that time, two releases have come out. So, it′s a good time to get back and analyze the fresh LLVM 21.

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PVS-Studio static analyzer examined LLVM 21 and uncovered various code issues including copy-paste errors, refactoring mistakes, undefined behavior risks, and logical flaws. The analysis revealed patterns like duplicated conditions, unreachable code, potential division by zero, incorrect enum comparisons, and merge artifacts. Examples span multiple LLVM backends (AArch64, PowerPC, RISC-V, ARM) and core components, demonstrating how even mature projects accumulate subtle bugs through incremental development.

Open wide: Inspecting LLVM 21 with static analysis