linux中使用gcc的__buildin_expect(long exp, long c)扩展进行程序分支预测功能。 1. 官方说明 — Built-in Function: long __builtin_expect (long exp, long c) You may use __builtin_expect to provide the compiler with branch prediction information. In general, you should prefer to use actual ...
// provide the compiler with branch prediction information #define likely(x) aco_likely(x) #define unlikely(x) aco_unlikely(x) // override the default `assert` for convenience when coding #define assert(EX) aco_assert(EX) // equal to `assert((ptr) != NULL)` #define assertptr(ptr) ...
现代处理器(CPU)的运作机制中存在两个用于加速执行的特性,推测执行( Speculative Execution)和间接分支预测(Indirect Branch Prediction)。 表面上看,处理器是依次顺序执行既定的处理器指令。但是,现代处理器为了更好利用处理器资源,已经开始启用并行执行,这个技术已经应用了20年左右 (1995 年开始)。假设,基于猜测或概率...
// provide the compiler with branch prediction information#definelikely(x) aco_likely(x)#defineunlikely(x) aco_unlikely(x)// override the default `assert` for convenience when coding#defineassert(EX) aco_assert(EX)// equal to `assert((ptr) != NULL)`...
[ 0.423958] Spectre V2 : mitigation: Enabling conditional Indirect Branch Prediction Barrier [ 0.423959] Spectre V2 : User space: Mitigation: STIBP via seccomp and prctl [ 0.423960] Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl and seccomp ...
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1Branch129Tags Code README Apache-2.0 license DeepLC: Retention time prediction for (modified) peptides using Deep Learning. Introduction DeepLC is a retention time predictor for (modified) peptides that employs Deep Learning. Its strength lies in the fact that it can accurately predict retention...
昨天,我在文章里分析了微测评的不可靠的问题,遗留了一点技术细节没有剖析清楚。评论区@王明哲提示了我可以用VTune工具,那我今天就来接着分析一下。 前情回顾 昨天的微测评中,我分别通过在queen.rs中程序开头添加NOP指令和queen.c中多次调用测试函数以及perf分析,证明了差异是由编译结果中被测代码的layout(相关代码...
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In the near future, their will be 2–3 neutron/photon sources running simultaneously at IHEP and its south branch. DPHEP policies of these new scientific facilities require more attentions. In 2019, the project of “National high energy physics data center” was proved by Chinese Ministry of ...