Finding Miscompiles for Fun, Not Profit

Summary

Justin Lebar, a compiler expert with 10 years of experience, spent over $10,000 in an afternoon running AI agents over compiler code, finding hundreds of plausible bugs in LLVM, including miscompiles and a 'Quite Serious' issue.

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Finding Miscompiles for Fun, Not Profit

5/30/2026, 3:15:54 AM

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