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The goal is to explain intermittent latency that appears only when multiple request handlers run concurrently on ARMv8-A aarch64 cores. The suspected component is the LDXR/STXR exclusive-load/store path, where the per-core exclusive monitor can fail repeatedly under contention and force retry loops. Uncertainty centers on whether the delay comes from exclusi
Shared aarch64 build target Goal: ship one repeatable aarch64 binary or library that executes without SIGILL on heterogeneous physical hosts and under QEMU user-mode emulation, while still using optional CPU extensions where available. Compiling with -march=armv8-a targets the mandatory ARMv8.0-A baseline and maximizes portability across Cortex-A72, Neoverse
Synchronization Constraints in Weakly Ordered Memory The ARMv8-A architecture utilizes a weakly ordered memory model where hardware may reorder memory accesses to maximize throughput. To manage synchronization, the architecture provides Load-Acquire (LDAR) and Store-Release (STLR) instructions, which establish one-way barriers to ensure specific ordering bet
aarch64