Optimizing ARM64 Atomics: When to Use Large System Extensions (LSE)
Learn how to leverage ARMv8.1-A Large System Extensions (LSE) to replace slow LL/SC atomic loops with high-performance hardware instructions in Linux.
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Learn how to leverage ARMv8.1-A Large System Extensions (LSE) to replace slow LL/SC atomic loops with high-performance hardware instructions in Linux.
Decide whether to use ARM64 Large System Extensions (LDAXR/STXR) or traditional LDREX/STREX for lock‑free data structures. Compare CPU, OS, compiler support, performance, and pitfalls, and see a practical C example with runtime guard.
Issue: atomic compare‑exchange never returns when a deadline is enforced In a Linux userspace program compiled for ARMv8‑A, a thread repeatedly executes a C++ std::atomic::compare_exchange_weak inside a loop that also checks a deadline and a cancellation flag. When the operation is contended on a big core, the loop appears to spin forever, even though the de
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