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 ...
when testing pointer or floating-point values. For the purposes of branch prediction optimizations, the probability that a __builtin_expect expression is true is controlled by GCC’s builtin-expect-probability parameter, which defaults to 90%. 1. 2. 3. 4. 5. 6. 7. 大概意思就是_...
Reducing the Cost of Branches Through Prediction通过预测来降低损耗 Static Branch Prediction 静态分支预测 Dynamic Branch Prediction and Branch-Prediction Buffers 动态分支预测和分支预测的缓冲区 C.3 How Is Pipelining Implemented?流水线是怎么实现? A Simple Implementation of RISC V A Basic Pipeline for RISC...
cachegrind: Cache分析器,可以查看引用次数,命中率等信息。 ==1655==Cachegrind, a cache and branch-prediction profiler ==1655==Copyright (C) 2002-2013, and GNU GPL'd, by Nicholas Nethercote et al. ==1655==Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info ==1655==Command...
C_branch_prediction synthesize branch predictor C_bp_global_depth global branch history trace size C_result_forwarding synthesize result bypasses C_load_aligner synthesize load aligner C_full_shifter pipelined instead of iterative shifer C_icache_size instruction cache size (0 to 64 KB) C_dcache_...
// 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) ...
看起来这个问题已经得到了很好的回答，编译器可能会执行循环取消切换，从循环中删除条件，并自动生成3个...
c p u 简介 CPU简介 一.CPU基本结构基本结构二.CPU性能参数性能参数三.CPU封装形式封装形式介紹CPU的指令集四.介紹介紹的指令集介绍主流CPU五.介绍主流介绍主流 CPU(CentralProcessingunit)是计算机最重要的核心部件.如果把电脑比作人,那么处理器就是人的大脑.计算机所有操作必须经过它才能完成.在它的控制之下,所有...
何况,也不见得就没有Java的JIT编译器能做,而C/C++的静态优化编译器不能做的优化:由于C/C++编译器的静态性,以运行期性能监控为基础的优化措施它都无法进行,如调用频率预测(Call Frequency Prediction)、分支频率预测(Branch Frequency Prediction)、裁剪未被选择的分支(Untaken Branch Pruning)等,这些都会形成一些Java...
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