{"id":45811,"date":"2024-01-14T18:35:15","date_gmt":"2022-12-03T16:20:32","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45811-2\/"},"modified":"2024-05-04T18:23:21","modified_gmt":"2024-05-04T10:23:21","slug":"45811-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45811-2\/","title":{"rendered":""},"content":{"rendered":"

\u306f\u3058\u3081\u306b<\/h1>\n

\u4ee5\u524d\u300cRust\u306esoftfloat\u30e9\u30a4\u30d6\u30e9\u30ea\u6bd4\u8f03\u300d\u3068\u3044\u3046\u8a18\u4e8b\u3067Rust\u306b\u304a\u3051\u308b\u30bd\u30d5\u30c8\u30a6\u30a8\u30a2\u5b9f\u88c5\u306e\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u6f14\u7b97\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u3068\u304d\u306b\u6c17\u3065\u304b\u306a\u304b\u3063\u305f\u306e\u3067\u3059\u304c\u3001\u5b9f\u306f\u3082\u3046\u4e00\u3064\u6709\u529b\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u3042\u3063\u305f\u306e\u3092\u6700\u8fd1\u767a\u898b\u3057\u307e\u3057\u305f\u306e\u3067\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n

rustc_apfloat<\/h1>\n

\u3053\u308c\u306fRust\u30b3\u30f3\u30d1\u30a4\u30e9\u5185\u90e8\u3067\u4f7f\u308f\u308c\u3066\u3044\u308b\u4efb\u610f\u7cbe\u5ea6\u306e\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u6f14\u7b97\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3059\u3002\uff08apfloat\u306fArbitrary Precision Float\u306e\u7565\u3067\u3059\uff09<\/p>\n

\u306a\u305cRust\u30b3\u30f3\u30d1\u30a4\u30e9\u5185\u3067\u3053\u306e\u3088\u3046\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u5fc5\u8981\u304b\u3068\u3044\u3046\u3068\u3001\u4e3b\u306bconst\u306a\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u6f14\u7b97\u3092\u884c\u3046\u305f\u3081\u3067\u3059\u3002
\n\u4e00\u822c\u7684\u306b\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u6f14\u7b97\u306fLLVM-IR\u3092\u7d4c\u7531\u3057\u3066\u5404\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u6a5f\u68b0\u8a9e\u306b\u5909\u63db\u3055\u308c\u3001CPU\u3067\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002
\n\u57fa\u672c\u7684\u306bCPU\u304c\u5b9f\u88c5\u3059\u308b\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u6f14\u7b97\u306fIEEE-754\u3068\u3044\u3046\u898f\u683c\u306b\u5f93\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u898f\u683c\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u90e8\u5206\u3082\u5c11\u3057\u3042\u308a\u3001\u5168\u3066\u306eCPU\u304b\u3089\u5168\u304f\u540c\u3058\u7d50\u679c\u304c\u5f97\u3089\u308c\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n

\u3082\u3057const\u306a\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u6f14\u7b97\u306e\u7d50\u679c\u304cCPU\u6bce\u306b\u9055\u3063\u3066\u3044\u305f\u3068\u3059\u308b\u3068\u3001\u305d\u306e\u6f14\u7b97\u7d50\u679c\u3092const generics\u306b\u9069\u7528\u3057\u3066\u578b\u3092\u751f\u6210\u3057\u305f\u3068\u304d\u306b\u3001CPU\u306b\u3088\u3063\u3066\u9055\u3046\u578b\u304c\u751f\u6210\u3055\u308c\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u30af\u30ed\u30b9\u30b3\u30f3\u30d1\u30a4\u30eb\u306e\u30d0\u30a4\u30ca\u30ea\u3068\u30cd\u30a4\u30c6\u30a3\u30d6\u30b3\u30f3\u30d1\u30a4\u30eb\u306e\u30d0\u30a4\u30ca\u30ea\u306e\u76f8\u4e92\u904b\u7528\u6027\u306b\u554f\u984c\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u305d\u3053\u3067\u30b3\u30f3\u30d1\u30a4\u30e9\u5185\u3067\u30bd\u30d5\u30c8\u30a6\u30a8\u30a2\u5b9f\u88c5\u306e\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u6f14\u7b97\u3092\u7528\u610f\u3057\u3066\u3001\u305d\u308c\u3092\u4f7f\u3063\u3066const\u8a08\u7b97\u3092\u884c\u3046\u3053\u3068\u3067\u4efb\u610f\u306e\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u3067\u5168\u304f\u540c\u3058\u6f14\u7b97\u7d50\u679c\u3092\u4fdd\u8a3c\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u304crustc_apfloat\u3067\u3059\u3002
\n\u3053\u308c\u306fLLVM\u306eAPFloat\u3092Rust\u306b\u79fb\u690d\u3057\u305f\u3082\u306e\u3067\u3001unsafe\u306a\u3057\u306epure-Rust\u30b3\u30fc\u30c9\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u5177\u4f53\u7684\u306a\u7d4c\u7def\u306f\u4ee5\u4e0b\u306ePR\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u57fa\u672c\u7684\u306b\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u5b9f\u88c5\u3067\u4f7f\u308f\u308c\u3066\u3044\u308b\u306e\u3067\u305d\u306e\u307e\u307e\u4f9d\u5b58\u95a2\u4fc2\u306b\u542b\u3081\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u304c\u3001\u5168\u304f\u540c\u3058\u3082\u306e\u3092\u30af\u30ec\u30fc\u30c8\u306b\u3057\u305f\u4eba\u304c\u3044\u308b\u306e\u3067\u666e\u901a\u306b\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u307e\u305f\u3001\u3053\u306erustc_apfloat\u3092\u6b63\u5f0f\u306b\u30af\u30ec\u30fc\u30c8\u5316\u3057\u3088\u3046\u3068\u3044\u3046\u8a71\u3082\u3042\u308a\u307e\u3059\u3002\u5143\u304cLLVM\u306e\u30b3\u30fc\u30c9\u306a\u306e\u3067\u73fe\u5728\u306f\u30e9\u30a4\u30bb\u30f3\u30b9\u306e\u53d6\u308a\u6271\u3044\u306b\u3064\u3044\u3066\u8b70\u8ad6\u3057\u3066\u3044\u308b\u3068\u3053\u308d\u306e\u3088\u3046\u3067\u3059\u3002<\/p>\n

\u4f7f\u3044\u65b9<\/h1>\n

\u4f7f\u3044\u65b9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u611f\u3058\u3067\u3059\u3002IEEE-754\u6e96\u62e0\u306eHalf\/Single\/Double\/Quad\u3084PowerPC\u306eDoubleDouble\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5185\u90e8\u8868\u73fe\u306f\u5168\u3066u128\u3067\u3059\u3002<\/p>\n

use<\/span> rustc_apfloat<\/span>::{<\/span>ieee<\/span>::<\/span>Half<\/span>,<\/span> Float<\/span>,<\/span> Round<\/span>};<\/span>\r\nlet<\/span> a<\/span> =<\/span> 0x1234<\/span>;<\/span>\r\nlet<\/span> b<\/span> =<\/span> 0x7654<\/span>;<\/span>\r\nlet<\/span> a<\/span> =<\/span> Half<\/span>::<\/span>from_bits<\/span>(<\/span>a<\/span> as<\/span> u128<\/span>);<\/span>\r\nlet<\/span> b<\/span> =<\/span> Half<\/span>::<\/span>from_bits<\/span>(<\/span>b<\/span> as<\/span> u128<\/span>);<\/span>\r\nlet<\/span> d<\/span> =<\/span> a<\/span>.add_r<\/span>(<\/span>b<\/span>,<\/span> Round<\/span>::<\/span>NearestTiesToEven<\/span>);<\/span>\r\nassert_eq!<\/span>(<\/span>d<\/span>.value<\/span>.to_bits<\/span>(),<\/span> 30292<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/h1>\n
\u4ee5\u524d\u6e2c\u5b9a\u3057\u305f\u306e\u3068\u540c\u3058\u74b0\u5883\u3067\u6e2c\u5b9a\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n
\"image.png\"<\/div>\n
\u7e26\u8ef8\u306f\u5bfe\u6570\u306a\u306e\u3067\u3054\u6ce8\u610f\u304f\u3060\u3055\u3044\u3002\u524d\u56de\u6700\u3082\u65e9\u304b\u3063\u305fC\u5b9f\u88c5\u306esoftfloat-sys\u3068\u6bd4\u3079\u308b\u306810\u500d\u304f\u3089\u3044\u306f\u9045\u3044\u3067\u3059\u304c\u3001rug\u3068\u306f\u540c\u7b49\u3067\u3059\u3057\u3001\u5341\u5206\u4f7f\u3048\u308b\u7bc4\u56f2\u3060\u3068\u601d\u3044\u307e\u3059\u3002pure-Rust\u3068\u3044\u3046\u3053\u3068\u3067\u3001WASM\u306a\u3069C\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u3092\u4f7f\u3044\u306b\u304f\u3044\u74b0\u5883\u306b\u9069\u3057\u3066\u3044\u308b\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u306f\u3058\u3081\u306b \u4ee5\u524d\u300cRust\u306esoftfloat\u30e9\u30a4\u30d6\u30e9\u30ea\u6bd4\u8f03\u300d\u3068\u3044\u3046\u8a18\u4e8b\u3067Rust\u306b\u304a\u3051\u308b\u30bd\u30d5\u30c8\u30a6\u30a8\u30a2\u5b9f\u88c5\u306e\u6d6e\u52d5 […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45811","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/45811-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u306f\u3058\u3081\u306b \u4ee5\u524d\u300cRust\u306esoftfloat\u30e9\u30a4\u30d6\u30e9\u30ea\u6bd4\u8f03\u300d\u3068\u3044\u3046\u8a18\u4e8b\u3067Rust\u306b\u304a\u3051\u308b\u30bd\u30d5\u30c8\u30a6\u30a8\u30a2\u5b9f\u88c5\u306e\u6d6e\u52d5 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45811-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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