{"id":108710,"date":"2026-09-22T13:24:41","date_gmt":"2026-09-22T05:24:41","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/108710.html"},"modified":"2026-09-22T13:24:41","modified_gmt":"2026-09-22T05:24:41","slug":"c-%e9%ab%98%e6%80%a7%e8%83%bd%e5%bc%80%e5%8f%91%e5%bf%85%e5%ad%a6%ef%bc%9a%e5%a4%9a%e7%ba%bf%e7%a8%8b%e3%80%81%e5%86%85%e5%ad%98%e6%b1%a0%e3%80%81simd-%e4%bc%98%e5%8c%96%e5%ae%9e%e6%88%98%ef%bc%8c","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/108710.html","title":{"rendered":"C++ \u9ad8\u6027\u80fd\u5f00\u53d1\u5fc5\u5b66\uff1a\u591a\u7ebf\u7a0b\u3001\u5185\u5b58\u6c60\u3001SIMD \u4f18\u5316\u5b9e\u6218\uff0c\u9644\u5b8c\u6574\u6e90\u7801"},"content":{"rendered":"<h3 id=\"%E5%89%8D%E8%A8%80\">\u524d\u8a00<\/h3>\n<p>\u5f88\u591a C&#043;&#043; \u540e\u7aef\u3001\u5e95\u5c42\u5f00\u53d1\u540c\u5b66\u5199\u4ee3\u7801&#xff0c;\u53ea\u5173\u6ce8\u529f\u80fd\u8dd1\u901a&#xff0c;\u4e0a\u7ebf\u4e4b\u540e\u624d\u53d1\u73b0\u5e76\u53d1\u4f4e\u3001\u5185\u5b58\u788e\u7247\u4e25\u91cd\u3001CPU \u5360\u7528\u5c45\u9ad8\u4e0d\u4e0b\u3002 \u9762\u8bd5\u3001\u9879\u76ee\u5f00\u53d1\u3001\u6027\u80fd\u74f6\u9888\u6392\u67e5&#xff0c;\u9ad8\u6027\u80fd C&#043;&#043;\u4e00\u76f4\u662f\u5927\u5382\u540e\u7aef\u3001\u6e38\u620f\u3001\u57fa\u7840\u67b6\u6784\u5c97\u4f4d\u9ad8\u9891\u8003\u70b9\u3002<\/p>\n<p>\u672c\u6587\u628a\u73b0\u4ee3 C&#043;&#043;&#xff08;C&#043;&#043;11\/14\/17&#xff09;\u9ad8\u6027\u80fd\u6838\u5fc3\u77e5\u8bc6\u70b9\u4e00\u6b21\u6027\u6574\u7406&#xff0c;\u5305\u542b\u591a\u7ebf\u7a0b\u540c\u6b65\u3001\u5185\u5b58\u6c60\u5b9e\u73b0\u3001SIMD \u6307\u4ee4\u5411\u91cf\u5316\u3001\u5e76\u53d1\u5bb9\u5668\u3001\u6027\u80fd\u8c03\u4f18\u907f\u5751&#xff0c;\u5168\u90e8\u9644\u5e26\u53ef\u76f4\u63a5\u7f16\u8bd1\u8fd0\u884c\u7684 C&#043;&#043; \u6e90\u7801&#xff0c;\u5efa\u8bae\u6536\u85cf&#xff0c;\u5f00\u53d1\u9047\u5230\u6027\u80fd\u95ee\u9898\u968f\u65f6\u7ffb\u770b\u3002<\/p>\n<p>\u914d\u5957\u8d44\u6e90&#xff1a;\u6587\u672b\u63d0\u4f9b\u6574\u5957 Markdown \u6587\u6863 &#043; \u6e90\u7801\u538b\u7f29\u5305&#xff0c;\u5305\u542b\u5168\u90e8\u7ae0\u8282\u4ee3\u7801&#xff0c;\u5f00\u7bb1\u5373\u7528\u3002<\/p>\n<h3 id=\"%E4%B8%80%E3%80%81C%2B%2B%20%E5%A4%9A%E7%BA%BF%E7%A8%8B%E4%B8%8E%E5%90%8C%E6%AD%A5%E6%9C%BA%E5%88%B6%EF%BC%88C%2B%2B11%20%E8%B5%B7%E6%A0%87%E5%87%86%E5%BA%93%EF%BC%89\">\u4e00\u3001C&#043;&#043; \u591a\u7ebf\u7a0b\u4e0e\u540c\u6b65\u673a\u5236&#xff08;C&#043;&#043;11 \u8d77\u6807\u51c6\u5e93&#xff09;<\/h3>\n<p>\u75db\u70b9&#xff1a;\u5f88\u591a\u65b0\u624b\u591a\u7ebf\u7a0b\u4ee3\u7801\u51fa\u73b0\u6570\u636e\u7ade\u4e89\u3001\u6b7b\u9501&#xff0c;\u5206\u4e0d\u6e05 join \u4e0e detach \u4f7f\u7528\u573a\u666f<\/p>\n<h4 id=\"1.1%20%E7%BA%BF%E7%A8%8B%E5%9F%BA%E7%A1%80%E5%88%9B%E5%BB%BA\">1.1 \u7ebf\u7a0b\u57fa\u7840\u521b\u5efa<\/h4>\n<p>#include &lt;iostream&gt;<br \/>\n#include &lt;thread&gt;<br \/>\nvoid task()<br \/>\n{<br \/>\n    std::cout &lt;&lt; &#034;\u5b50\u7ebf\u7a0b\u6267\u884c&#034; &lt;&lt; std::endl;<br \/>\n}<br \/>\nint main()<br \/>\n{<br \/>\n    std::thread t(task);<br \/>\n    t.join(); \/\/ \u4e3b\u7ebf\u7a0b\u963b\u585e\u7b49\u5f85\u5b50\u7ebf\u7a0b\u6267\u884c\u5b8c\u6bd5<br \/>\n    return 0;<br \/>\n}<\/p>\n<h4 id=\"1.2%20%E4%BA%92%E6%96%A5%E9%94%81%E8%A7%A3%E5%86%B3%E8%B5%84%E6%BA%90%E7%AB%9E%E4%BA%89\">1.2 \u4e92\u65a5\u9501\u89e3\u51b3\u8d44\u6e90\u7ade\u4e89<\/h4>\n<p>\u591a\u4e2a\u7ebf\u7a0b\u8bfb\u5199\u540c\u4e00\u4e2a\u5171\u4eab\u53d8\u91cf&#xff0c;\u4e0d\u52a0\u9501\u4f1a\u51fa\u73b0\u6570\u636e\u7ade\u4e89&#xff0c;std::mutex\u4fdd\u62a4\u4e34\u754c\u533a\u3002<\/p>\n<p>#include &lt;iostream&gt;<br \/>\n#include &lt;thread&gt;<br \/>\n#include &lt;mutex&gt;<br \/>\nstd::mutex mtx;<br \/>\nint count &#061; 0;<br \/>\nvoid add()<br \/>\n{<br \/>\n    std::lock_guard&lt;std::mutex&gt; lock(mtx);<br \/>\n    count&#043;&#043;;<br \/>\n}<br \/>\nint main()<br \/>\n{<br \/>\n    std::thread t1(add);<br \/>\n    std::thread t2(add);<br \/>\n    t1.join();<br \/>\n    t2.join();<br \/>\n    std::cout &lt;&lt; count &lt;&lt; std::endl;<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\u5e38\u89c1\u8e29\u5751&#xff1a;\u9501\u7c92\u5ea6\u4e0d\u8981\u5199\u592a\u5927&#xff0c;\u4e34\u754c\u533a\u4ee3\u7801\u8d8a\u5c11\u8d8a\u597d&#xff0c;\u51cf\u5c11\u7ebf\u7a0b\u963b\u585e\u7b49\u5f85\u3002<\/p>\n<h3 id=\"%E4%BA%8C%E3%80%81C%2B%2B11%2F14%2F17%20%E6%96%B0%E7%89%B9%E6%80%A7%EF%BC%8C%E9%AB%98%E6%80%A7%E8%83%BD%E5%BC%80%E5%8F%91%E5%BF%85%E5%A4%87\">\u4e8c\u3001C&#043;&#043;11\/14\/17 \u65b0\u7279\u6027&#xff0c;\u9ad8\u6027\u80fd\u5f00\u53d1\u5fc5\u5907<\/h3>\n<p>\u73b0\u4ee3 C&#043;&#043; \u5927\u91cf\u7279\u6027\u5c31\u662f\u4e3a\u51cf\u5c11\u5185\u5b58\u62f7\u8d1d\u3001\u964d\u4f4e\u5f00\u9500\u8bbe\u8ba1&#xff0c;\u5199\u9ad8\u6027\u80fd\u4ee3\u7801\u5fc5\u987b\u638c\u63e1&#xff1a;<\/p>\n<li>\u79fb\u52a8\u8bed\u4e49 std::move&#xff1a;\u8f6c\u79fb\u5bf9\u8c61\u6240\u6709\u6743&#xff0c;\u907f\u514d\u5927\u5bf9\u8c61\u62f7\u8d1d&#xff0c;\u51cf\u5c11\u5185\u5b58\u5f00\u9500<\/li>\n<li>\u667a\u80fd\u6307\u9488\u9009\u578b<\/li>\n<p>std::string a &#061; &#034;hello&#034;;<br \/>\nstd::string b &#061; std::move(a);<\/p>\n<ul>\n<li>std::unique_ptr&#xff1a;\u72ec\u5360\u6240\u6709\u6743&#xff0c;\u96f6\u8fd0\u884c\u65f6\u5f00\u9500&#xff0c;\u9ad8\u6027\u80fd\u573a\u666f\u9996\u9009<\/li>\n<li>std::shared_ptr&#xff1a;\u5171\u4eab\u6240\u6709\u6743&#xff0c;\u5b58\u5728\u539f\u5b50\u8ba1\u6570\u5f00\u9500&#xff0c;\u70ed\u70b9\u8def\u5f84\u5c3d\u91cf\u5c11\u7528<\/li>\n<\/ul>\n<p>\u00a0 \u00a0 \u00a03.constexpr \u7f16\u8bd1\u671f\u8ba1\u7b97&#xff1a;\u8ba1\u7b97\u5728\u7f16\u8bd1\u9636\u6bb5\u5b8c\u6210&#xff0c;\u8fd0\u884c\u671f\u76f4\u63a5\u62ff\u7ed3\u679c&#xff0c;\u51cf\u5c11 CPU \u6d88\u8017<\/p>\n<p>constexpr int calc(int x){return x*x;}<br \/>\nconstexpr int res &#061; calc(10);<\/p>\n<h3>\u4e09\u3001\u5185\u5b58\u6c60\u539f\u7406\u4e0e\u5b8c\u6574 C&#043;&#043; \u5b9e\u73b0&#xff08;\u9ad8\u9891\u9762\u8bd5\u8003\u70b9&#xff09;<\/h3>\n<p>\u75db\u70b9&#xff1a;\u9891\u7e41 new\/delete \u4f1a\u4ea7\u751f\u5927\u91cf\u5185\u5b58\u788e\u7247&#xff0c;\u7cfb\u7edf\u8c03\u7528\u5f00\u9500\u5de8\u5927\u3002\u5185\u5b58\u6c60\u9884\u5148\u7533\u8bf7\u4e00\u5757\u8fde\u7eed\u5185\u5b58&#xff0c;\u590d\u7528\u5185\u5b58\u5757&#xff0c;\u5927\u5e45\u63d0\u5347\u9ad8\u9891\u521b\u5efa\u9500\u6bc1\u573a\u666f\u6027\u80fd\u3002<\/p>\n<p>#include &lt;iostream&gt;<br \/>\n#include &lt;cstdlib&gt;<br \/>\nclass MemoryPool<br \/>\n{<br \/>\npublic:<br \/>\n    MemoryPool(size_t blockSize, size_t num)<br \/>\n    {<br \/>\n        pool &#061; malloc(blockSize * num);<br \/>\n        freeList &#061; pool;<br \/>\n        char* p &#061; (char*)pool;<br \/>\n        for(size_t i&#061;0;i&lt;num-1;i&#043;&#043;)<br \/>\n        {<br \/>\n            *(void**)p &#061; p &#043; blockSize;<br \/>\n            p &#043;&#061; blockSize;<br \/>\n        }<br \/>\n        *(void**)p &#061; nullptr;<br \/>\n    }<br \/>\n    void* alloc()<br \/>\n    {<br \/>\n        if(!freeList) return nullptr;<br \/>\n        void* ret &#061; freeList;<br \/>\n        freeList &#061; *(void**)freeList;<br \/>\n        return ret;<br \/>\n    }<br \/>\n    void freeMem(void* p)<br \/>\n    {<br \/>\n        *(void**)p &#061; freeList;<br \/>\n        freeList &#061; p;<br \/>\n    }<br \/>\n    ~MemoryPool(){free(pool);}<br \/>\nprivate:<br \/>\n    void* pool &#061; nullptr;<br \/>\n    void* freeList &#061; nullptr;<br \/>\n};<br \/>\nint main()<br \/>\n{<br \/>\n    MemoryPool pool(32,100);<br \/>\n    void* p1 &#061; pool.alloc();<br \/>\n    pool.freeMem(p1);<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\u9002\u7528\u573a\u666f&#xff1a;\u6e38\u620f\u5f15\u64ce\u3001\u7f51\u5173\u670d\u52a1\u3001\u9ad8\u9891\u521b\u5efa\u9500\u6bc1\u5c0f\u5bf9\u8c61\u7684\u5e95\u5c42\u670d\u52a1\u3002<\/p>\n<h3>\u56db\u3001SIMD \u6307\u4ee4\u96c6&#xff0c;\u5355\u6307\u4ee4\u591a\u6570\u636e\u52a0\u901f\u6570\u503c\u8ba1\u7b97<\/h3>\n<p>SIMD&#xff08;AVX2&#xff09;\u4e00\u6761\u6307\u4ee4\u4e00\u6b21\u6027\u5904\u7406 8 \u4e2a\u6d6e\u70b9\u6570&#xff0c;\u56fe\u50cf\u5904\u7406\u3001\u77e9\u9635\u8fd0\u7b97\u3001\u4fe1\u53f7\u4eff\u771f\u6027\u80fd\u76f4\u63a5\u7ffb\u500d\u3002<\/p>\n<p>#include &lt;immintrin.h&gt;<br \/>\n#include &lt;iostream&gt;<br \/>\nint main()<br \/>\n{<br \/>\n    float a[8] &#061; {1,2,3,4,5,6,7,8};<br \/>\n    float b[8] &#061; {1,1,1,1,1,1,1,1};<br \/>\n    float res[8];<br \/>\n    __m256 va &#061; _mm256_loadu_ps(a);<br \/>\n    __m256 vb &#061; _mm256_loadu_ps(b);<br \/>\n    __m256 vr &#061; _mm256_add_ps(va, vb);<br \/>\n    _mm256_storeu_ps(res, vr);<br \/>\n    for(int i&#061;0;i&lt;8;i&#043;&#043;) std::cout &lt;&lt; res[i] &lt;&lt; &#034; &#034;;<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\u7f16\u8bd1\u547d\u4ee4&#xff1a;g&#043;&#043; simd.cpp -o simd -mavx2<\/p>\n<h3>\u4e94\u3001\u5e76\u53d1\u5bb9\u5668\u4e0e\u65e0\u9501\u7f16\u7a0b\u8981\u70b9<\/h3>\n<li>STL \u6807\u51c6\u5bb9\u5668\u672c\u8eab\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168&#xff0c;\u591a\u7ebf\u7a0b\u8bfb\u5199\u5fc5\u987b\u81ea\u5df1\u52a0\u9501<\/li>\n<li>std::atomic\u539f\u5b50\u64cd\u4f5c&#xff0c;\u662f\u65e0\u9501\u7f16\u7a0b\u57fa\u7840&#xff0c;\u9002\u5408\u7b80\u5355\u6570\u503c\u5e76\u53d1\u8ba1\u6570<\/li>\n<p>#include &lt;atomic&gt;<br \/>\nstd::atomic&lt;int&gt; num{0};<br \/>\nvoid add()<br \/>\n{<br \/>\n    num.fetch_add(1);<br \/>\n}<\/p>\n<p>\u00a0 \u00a03.\u9009\u578b\u5efa\u8bae<\/p>\n<ul>\n<li>\u666e\u901a\u4e1a\u52a1&#xff1a;mutex&#043;STL\u5bb9\u5668&#xff0c;\u5f00\u53d1\u7b80\u5355\u7a33\u5b9a<\/li>\n<li>\u8d85\u9ad8\u541e\u5410\u573a\u666f&#xff1a;\u65e0\u9501\u961f\u5217&#xff0c;\u6ce8\u610f ABA \u95ee\u9898&#xff0c;\u5f00\u53d1\u96be\u5ea6\u66f4\u9ad8<\/li>\n<\/ul>\n<h3>\u516d\u3001\u6027\u80fd\u8c03\u4f18\u6d41\u7a0b &amp; \u9ad8\u9891\u8e29\u5751<\/h3>\n<h4>\u6027\u80fd\u5206\u6790\u5de5\u5177<\/h4>\n<p>Linux&#xff1a;perf\u3001gprof&#xff1b;Windows&#xff1a;VS \u6027\u80fd\u63a2\u67e5\u5668<\/p>\n<p>\u6838\u5fc3\u539f\u5219&#xff1a;\u5148\u5b9a\u4f4d\u74f6\u9888&#xff0c;\u518d\u4f18\u5316&#xff0c;\u4e0d\u8981\u63d0\u524d\u76f2\u76ee\u4f18\u5316<\/p>\n<h4>\u9ad8\u9891\u5751<\/h4>\n<li>\u4f2a\u5171\u4eab&#xff1a;\u591a\u6838 CPU \u591a\u4e2a\u53d8\u91cf\u653e\u5728\u540c\u4e00\u7f13\u5b58\u884c&#xff0c;\u9020\u6210\u7f13\u5b58\u9891\u7e41\u5931\u6548<\/li>\n<li>\u9891\u7e41 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