{"id":13787,"date":"2025-06-14T09:33:38","date_gmt":"2025-06-14T01:33:38","guid":{"rendered":"https:\/\/www.killtest.com.tw\/?p=13787"},"modified":"2025-06-14T09:33:38","modified_gmt":"2025-06-14T01:33:38","slug":"rust-%e6%af%94-c-%e6%9b%b4%e5%bf%ab%e5%90%97%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.killtest.com.tw\/?p=13787","title":{"rendered":"Rust \u6bd4 C \u66f4\u5feb\u5417\uff1f"},"content":{"rendered":"\n

\u6700\u8fd1 Reddit \u4e0a\u6709\u4eba\u5728\u554f\u554f\u984c\uff1a\u5728\u5176\u4ed6\u689d\u4ef6\u76f8\u540c\u7684\u60c5\u6cc1\u4e0b\uff0c\u4ec0\u9ebc\u65b9\u6cd5\u6703\u8b93 Rust \u5be6\u73fe\u6bd4 C \u5be6\u73fe\u66f4\u5feb\uff1f\u6211\u89ba\u5f97\u9019\u500b\u554f\u984c\u5f88\u597d\uff0c\u4e5f\u5f88\u6709\u8da3\uff01\u9019\u500b\u554f\u984c\u5176\u5be6\u5f88\u96e3\u56de\u7b54\uff0c\u56e0\u70ba\u5b83\u6700\u7d42\u53d6\u6c7a\u65bc\u300c\u842c\u7269\u7686\u540c\u300d\u7684\u5177\u9ad4\u610f\u7fa9\u3002
\u6211\u89ba\u5f97\u9019\u4e5f\u4f7f\u5f97\u8a9e\u8a00\u4e4b\u9593\u7684\u6bd4\u8f03\u8b8a\u5f97\u56f0\u96e3\u3002\u53ef\u4ee5\u900f\u904e\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u5f0f\u4f86\u8ad6\u8b49\u4e8b\u7269\u201c\u76f8\u540c\u201d\u548c\u201c\u4e0d\u540c\u201d\uff0c\u4ee5\u53ca\u5b83\u5011\u5c0d\u904b\u884c\u6642\u8868\u73fe\u7684\u5f71\u97ff\u3002
Rust \u8a9e\u8a00\u5167\u5efa\u4e86\u5167\u5d4c\u5f59\u7de8\u3002\u800c C \u8a9e\u8a00\u5247\u5c07\u5167\u806f\u5f59\u7de8\u4f5c\u70ba\u4e00\u7a2e\u975e\u5e38\u5e38\u898b\u7684\u7de8\u8b6f\u5668\u64f4\u5c55\uff0c\u4ee5\u81f3\u65bc\u8aaa\u5b83\u4e0d\u662f\u8a72\u8a9e\u8a00\u7684\u4e00\u90e8\u5206\u90fd\u662f\u4e00\u7a2e\u6709\u722d\u8b70\u7684\u5439\u6bdb\u6c42\u75b5\u3002
\u4f86\u770b\u770b Rust \u8a9e\u8a00\u4e2d\u7684\u4e00\u500b\u7a0b\u5f0f\u78bc\u7bc4\u4f8b\uff1a\u4ee5\u4e0b\u662f\u4e00\u500b\u51fd\u6578rdtsc\u7528\u4f86\u8b80\u53d6\u6642\u9593\u6233\uff0c\u4e26\u50b3\u56de\u5176\u503c\u3002\u4ee5\u4e0b\u662f C \u8a9e\u8a00\u7684\u7a0b\u5f0f\u78bc\u5be6\u4f5c\u7bc4\u4f8b\uff1a<\/p>\n\n\n\n

#include\u00a0<stdint.h>\nuint64_t\u00a0rdtsc(void)\n{\u00a0 \u00a0 \n uint32_t\u00a0lo, hi;\n __asm__\u00a0__volatile__\u00a0(\u00a0\n \u00a0 \u00a0 \u00a0 \"rdtsc\"\u00a0 \u00a0 \u00a0 \u00a0 \n:\u00a0\"=a\"(lo),\u00a0\"=d\"(hi)\n\u00a0 \u00a0 );\u00a0 \u00a0 \nreturn\u00a0((uint64_t)hi\u00a0<<\u00a032)\u00a0|\u00a0lo;}<\/code><\/pre>\n\n\n\n
\u4ee5\u4e0b\u662f\u5728 rustc1.87.0<\/code>\u548c clang\u4e0b20.1.0\u76f8\u540c\u529f\u80fd\u7684\u7a0b\u5e8f\uff1a<\/code><\/p>\n\n\n\n
rdtsc:\u00a0 \u00a0 \u00a0 \u00a0 \n      rdtsc\u00a0 \u00a0 \u00a0 \u00a0 \n      shl\u00a0 \u00a0 \u00a0rdx,\u00a032\u00a0 \u00a0 \u00a0 \u00a0 \n      mov\u00a0 \u00a0 \u00a0eax,\u00a0eax\u00a0 \u00a0 \u00a0 \u00a0 \n      or\u00a0 \u00a0 \u00a0 rax,\u00a0rdx\u00a0 \u00a0 \u00a0 \u00a0 \n      ret<\/code><\/pre>\n\n\n\n
\u4ee5\u4e0b\u662f\u7dda\u4e0a\u7de8\u8b6f\u7db2\u7ad9 Godbolt \u4e0a\u7684\u9023\u7d50\uff1a
 https:\/\/godbolt.org\/z\/f7K8cfnx7
\u9019\u7b97\u55ce\uff1f\u6211\u4e0d\u77e5\u9053\u3002
\u6211\u89ba\u5f97\u9019\u8ddf\u554f\u984c\u672c\u8eab\u6c92\u6709\u592a\u5927\u95dc\u4fc2\uff0c\u4f46\u81f3\u5c11\u662f\u56de\u7b54\u554f\u984c\u7684\u4e00\u7a2e\u65b9\u5f0f\u3002\u985e\u4f3c\u7684\u7a0b\u5f0f\u78bc\uff0c\u4e0d\u540c\u7684\u7d50\u679c
 Rust \u548c C \u8a9e\u8a00\u5c0d\u65bc\u985e\u4f3c\u7684\u7a0b\u5f0f\u78bc\u53ef\u4ee5\u6709\u4e0d\u540c\u7684\u8a9e\u610f\u3002\u4ee5\u4e0b\u662f Rust \u4e2d\u7684\u4e00\u500b\u7d50\u69cb\u9ad4<\/p>\n\n\n\n
\u8fd9\u662f C \u8bed\u8a00\u4e2d\u7684\u201c\u76f8\u540c\u201d\u7ed3\u6784\uff1a<\/p>\n\n\n\n
struct\u00a0C {\u00a0 \u00a0 \n          uint32_t\u00a0x;\u00a0 \u00a0 \n          uint64_t\u00a0y;\u00a0 \u00a0 \n          uint32_t\u00a0z;\n};<\/code><\/pre>\n\n\n\n
\u5728 Rust \u4e2d\uff0c\u9019\u500b\u7d50\u69cb\u662f 16 \u500b\u4f4d\u5143\u7d44\uff08\u540c\u6a23\u5728 x86_64 \u4e0a\uff09\uff0c\u800c\u5728 C \u4e2d\uff0c\u5b83\u662f 24 \u500b\u4f4d\u5143\u7d44\u3002\u9019\u662f\u7531\u65bc Rust \u53ef\u4ee5\u81ea\u7531\u5730\u91cd\u65b0\u6392\u5e8f\u6b04\u4f4d\u4ee5\u512a\u5316\u5927\u5c0f\uff0c\u800c C \u8a9e\u8a00\u5247\u4e0d\u80fd\u3002
\u793e\u6703\u56e0\u7d20
 \u6709\u4e9b\u4eba\u5831\u544a\u8aaa\uff0c\u7531\u65bc Rust \u7684\u5b89\u5168<\/a>\u6aa2\u67e5\u6a5f\u5236\uff0c\u4ed6\u5011\u66f4\u9858\u610f\u7de8\u5beb\u6bd4\u540c\u7b49 C\uff08\u6216 C++\uff09\u66f4\u300c\u5371\u96aa\u300d\u7684\u7a0b\u5f0f\u78bc\uff0c\u56e0\u70ba\u5728 C\uff08\u6216 C++\uff09\u4e2d\uff0c\u4ed6\u5011\u6703\u9032\u884c\u66f4\u591a\u8907\u88fd\u4ee5\u78ba\u4fdd\u7a0b\u5f0f\u78bc\u66f4\u5b89\u5168\u3002<\/p>\n\n\n\n
\u5f9e\u540c\u4e00\u500b\u5c08\u6848\u4e2d\u7684\u76f8\u540c\u958b\u767c\u4eba\u54e1\u7684\u89d2\u5ea6\u4f86\u770b\uff0c\u9019\u4f3c\u4e4e\u662f\u201c\u76f8\u540c\u7684\u201d\uff0c\u4f46\u7531\u65bc\u5224\u65b7\u8abf\u7528\uff0c\u7a0b\u5f0f\u78bc\u6703\u6709\u6240\u4e0d\u540c\u3002<\/p>\n\n\n\n
\u5f88\u4e45\u4ee5\u524d\u6709\u4e00\u500b\u7bc4\u4f8b\u662f Stylo \u5c08\u6848\u3002 Mozilla \u66fe\u7d93\u5169\u6b21\u5617\u8a66\u7528 C++ \u4e26\u884c\u5316 Firefox \u700f\u89bd\u5668\u7684\u6a23\u5f0f\u4f48\u5c40\uff0c\u4f46\u5169\u6b21\u90fd\u5931\u6557\u4e86\u3002\u56e0\u70ba\u591a\u57f7\u884c\u7dd2\u8655\u7406\u592a\u68d8\u624b\uff0c\u96e3\u4ee5\u5be6\u73fe\u3002\u7b2c\u4e09\u6b21\uff0c\u4ed6\u5011\u4f7f\u7528\u4e86 Rust\uff0c\u4e26\u6210\u529f\u4ea4\u4ed8\u3002\u9019\u662f\u540c\u4e00\u500b\u5c08\u6848\uff08\u96d6\u7136\u6211\u8a8d\u70ba\u4e0d\u662f\u540c\u4e00\u500b\u7a0b\u5f0f\u8a2d\u8a08\u5e2b\uff09\uff0c\u7531\u540c\u4e00\u500b\u7d44\u7e54\u958b\u767c\uff0c\u4f46\u4e00\u6b21\u53ef\u884c\uff0c\u4e00\u6b21\u5247\u4e0d\u884c\u3002<\/p>\n\n\n\n
\u985e\u4f3c\u7684\u554f\u984c\u4e5f\u9069\u7528\uff1a\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u521d\u7d1a\u958b\u767c\u4eba\u54e1\uff0c\u4ed6\u540c\u6642\u5beb Rust \u548c C \u8a9e\u8a00\u4f86\u5b8c\u6210\u540c\u4e00\u500b\u4efb\u52d9\u3002\u6211\u5011\u80fd\u5426\u7528\u5176\u4e2d\u4e00\u7a2e\u8a9e\u8a00\u5beb\u51fa\u66f4\u5feb\u7684\u7a0b\u5f0f\u78bc\u5462\uff1f\u9019\u500b\u554f\u984c\u53d6\u6c7a\u65bc\u4ed6\u7684\u80fd\u529b\u6c34\u5e73\uff0c\u4f46\u8207\u7de8\u5beb\u540c\u4e00\u4efd\u7a0b\u5f0f\u78bc\u7121\u95dc\u3002\u9019\u300c\u4e00\u6a23\u300d\u55ce\uff1f\u6211\u4e0d\u77e5\u9053\u3002\u5982\u679c\u540c\u4e00\u500b\u4efb\u52d9\u4ea4\u7d66\u5169\u7a2e\u8a9e\u8a00\u7684\u5c08\u5bb6\uff0c\u4e00\u500b\u975e\u5e38\u7cbe\u901a Rust \u4f46\u4e0d\u4e86\u89e3 C \u8a9e\u8a00\u7684\u4eba\uff0c\u53cd\u4e4b\u4ea6\u7136\uff0c\u6703\u600e\u9ebc\u6a23\u5462\uff1f\u9019\u500b\u8207\u521d\u7d1a\u958b\u767c\u4eba\u54e1\u6216\u300c\u666e\u901a\u300d\u958b\u767c\u4eba\u54e1\u6709\u4ec0\u9ebc\u5340\u5225\uff1f\u7de8\u8b6f\u6642\u8207\u57f7\u884c\u6642\u9593\uff1f
 \u53e6\u4e00\u4f4d Reddit \u7528\u6236\u5728\u554f\u984c\u5e95\u90e8\u8ffd\u554f\uff1a\u6211\u4e0d\u662f Rust \u5c08\u5bb6\uff0c\u4f46\u5927\u591a\u6578\uff08\u5168\u90e8\uff1f\uff09\u5b89\u5168\u6aa2\u67e5\u4e0d\u662f\u90fd\u662f\u7de8\u8b6f\u6642\u6aa2\u67e5\u55ce\uff1f\u5b83\u5011\u61c9\u8a72\u4e0d\u6703\u5c0d\u904b\u884c\u6642\u7522\u751f\u4efb\u4f55\u5f71\u97ff\u3002\u9019\u4e5f\u662f\u597d\u554f\u984c\uff01\u9019\u90e8\u5206\u662f\u53e6\u4e00\u500b\u9810\u8a2d\u8a2d\u5b9a\u4e0d\u540c\u7684\u4f8b\u5b50\u3002<\/p>\n\n\n\n
\u4f8b\u5982\uff0carray[0]\u7684\u9019\u7a2e\u8072\u660e\u5728\u5169\u7a2e\u8a9e\u8a00\u4e2d\u90fd\u6709\u6548\u3002 Rust \u8a9e\u8a00\u5728\u57f7\u884c\u6642\u6703\u9032\u884c\u908a\u754c\u6aa2\u67e5\u3002\u800c C \u8a9e\u8a00\u5247\u6c92\u6709\u9019\u7a2e\u80fd\u529b\u3002\u5728 Rust \u4e2d\uff0c\u6211\u53ef\u4ee5\u5bebarray.get_unchecked(0)\uff0c\u4e26\u7372\u5f97 C \u7684\u8a9e\u7fa9\u3002\u5728 C \u8a9e\u8a00\u4e2d\uff0c\u6211\u9700\u8981\u7de8\u5beb\u908a\u754c\u6aa2\u67e5\u4f86\u7372\u5f97 Rust \u7684\u8a9e\u7fa9\u3002\u5728 Rust \u4e2d\uff0c\u5982\u679c\u7de8\u8b6f\u5668\u80fd\u5920\u8b49\u660e\u5b83\u662f\u5b89\u5168\u7684\uff0c\u90a3\u9ebc\u6aa2\u67e5\u53ef\u80fd\u6703\u88ab\u6700\u4f73\u5316\u6389\u3002\u5728 C \u8a9e\u8a00\u4e2d\uff0c\u5982\u679c\u6211\u5011\u624b\u5beb\u908a\u754c\u6aa2\u67e5\uff0c\u5982\u679c\u7de8\u8b6f\u5668\u80fd\u5920\u8b49\u660e\u5b83\u662f\u5b89\u5168\u7684\uff0c\u90a3\u9ebc\u6aa2\u67e5\u4e5f\u53ef\u80fd\u88ab\u6700\u4f73\u5316\u6389\u3002 Rust \u7684\u8a31\u591a\u5b89\u5168\u6aa2\u67e5\u662f\u5728\u7de8\u8b6f\u6642\u9032\u884c\u7684\uff0c\u4f46\u4e5f\u6709\u4e00\u4e9b\u5de5\u4f5c\u662f\u5728\u57f7\u884c\u6642\u9032\u884c\u7684\u3002\u4f46\u9019\u53c8\u5f15\u51fa\u4e86\u53e6\u4e00\u500b\u6709\u8da3\u7684\u554f\u984c\uff1a\u7de8\u8b6f\u6642\u6aa2\u67e5\u53ef\u80fd\u6703\u5c0e\u81f4\u4f60\u70ba\u76f8\u540c\u4efb\u52d9\u7de8\u5beb\u8207 C \u8a9e\u8a00\u4e0d\u540c\u7684\u7a0b\u5f0f\u78bc\u3002\u4e00\u500b\u5e38\u898b\u7684\u4f8b\u5b50\u662f\u4f7f\u7528\u7d22\u5f15\u800c\u4e0d\u662f\u6307\u91dd\uff0c\u9019\u610f\u5473\u8457\u7522\u751f\u7684\u7a0b\u5f0f\u78bc\u57f7\u884c\u65b9\u5f0f\u7684\u4e0d\u540c\u3002\u9019\u7a2e\u6aa2\u67e5\u771f\u7684\u662f\u300c\u5728\u7de8\u8b6f\u6642\u300d\u9032\u884c\u55ce\uff1f\u5f9e\u6280\u8853\u5c64\u9762\uff0c\u5728\u5fae\u89c0\u5c64\u9762\uff0c\u662f\u9019\u6a23\u7684\u3002\u4f46\u5728\u5de5\u7a0b\u5c64\u9762\u53ef\u80fd\u4e26\u975e\u5982\u6b64\uff01\u7d50\u8ad6
 \u6211\u8a8d\u70ba\u9019\u500b\u554f\u984c\u6700\u91cd\u8981\u7684\u90e8\u5206\u8207\u6240\u8b02\u7684\u53ef\u80fd\u6027\u6709\u95dc\uff0c\u5373\uff1a\u5982\u679c\u6211\u5011\u5047\u8a2d C \u662f\u201c\u6700\u5feb\u7684\u8a9e\u8a00\u201d\uff0c\u7121\u8ad6\u9019\u610f\u5473\u8457\u4ec0\u9ebc\uff1bRust \u4e0d\u80fd\u505a\u540c\u6a23\u7684\u4e8b\u60c5\uff0c\u662f\u5426\u5b58\u5728\u5167\u90e8\u539f\u56e0\uff1f
 \u6211\u8a8d\u70ba\u7b54\u6848\u662f\u201c\u5426\u201d\uff0c\u5373\u4f7f\u5ffd\u7565\u5167\u806f\u5f59\u7de8\u7684\u60c5\u6cc1\u4e5f\u662f\u5982\u6b64\u3002\u6240\u4ee5\u5728\u9019\u500b\u6700\u91cd\u8981\u7684\u3001\u6700\u6839\u672c\u7684\u5c64\u9762\u4e0a\uff0c\u7b54\u6848\u662f\u300c\u5169\u8005\u4e4b\u9593\u6c92\u6709\u5dee\u5225\u300d\u3002\u4f46\u6211\u5011\u901a\u5e38\u4e0d\u6703\u8ac7\u8ad6\u9019\u4e9b\u3002\u6211\u5011\u901a\u5e38\u6703\u5728\u5de5\u7a0b\u7684\u80cc\u666f\u4e0b\u8a0e\u8ad6\u67d0\u500b\u4e8b\u60c5\uff0c\u4f8b\u5982\u4e00\u500b\u7279\u5b9a\u7684\u9805\u76ee\uff0c\u6709\u7279\u5b9a\u7684\u958b\u767c\u4eba\u54e1\uff0c\u6709\u7279\u5b9a\u7684\u6642\u9593\u9650\u5236\u7b49\u7b49\u3002\u6211\u8a8d\u70ba\u9019\u88e1\u8b8a\u6578\u592a\u591a\uff0c\u5f88\u96e3\u5f97\u51fa\u666e\u904d\u7684\u7d50\u8ad6\u3002
\u4f5c\u8005\uff1aSteve Klabnik
\u7f16\u8bd1\uff1a\u6d1b\u9038
\u539f\u6587\uff1ahttps:\/\/steveklabnik.com\/writing\/is-rust-faster-than-c<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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