How a Rogue Optimization Breaks C11 Memory Consistency

A widely used compiler optimization contains a serious error that breaks C11's memory consistency model by introducing a shared memory data race. Although the optimization is perfectly valid for single-threaded programs, it has the potential to break multi-threaded programs based on  both C11's threaded model and the commonly used pthreaded model.

By Marcel Beemster, Solid Sands


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