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J. Nick Koston
63a0581440
On Xtensa (ESP32), even relaxed atomic loads emit memw instructions, but they avoid the more expensive acquire fences. The pop() path required acquire loads + release stores just to discover the queue was empty. By checking empty_relaxed() first, the steady-state connected path (queue always empty) returns in ~7 instructions instead of falling through to get_and_reset_dropped_count() and pop().
