Unverified50% confidenceFactExact time
每条DMB指令可能造成数十甚至上百个时钟周期的流水线停顿
1
Sources
50%
Confidence
Long-term
Relevance
7/9/2026
First Seen
Sources
C++ Asymmetric Memory Barriers: Principles, Implementation, and Engineering Applications
hackernewshackernews7/3/2026
Related Claims
UnverifiedInteger division (such as the x86 DIV/IDIV instructions) can have a latency as high as 20 to 90 clock cycles on many microarchitectures and often does not support pipelining.68% similarUnverified现代处理器通常有10到20个流水线阶段，分支预测失败触发流水线冲刷的代价通常是10到20个时钟周期的停顿67% similarUnverifiedRegister access latency is approximately 1 clock cycle, shared memory latency is approximately tens of clock cycles, and global memory latency can reach hundreds of clock cycles.63% similarUnverifiedThe chain latency of a four-agent serial pipeline alone can reach 20 to 60 seconds.62% similar
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