{"topic":{"id":12131,"title":"optim lab 中 cpe 增加问题","slug":"topic","categoryId":58,"createdAt":"2024-05-14 12:43:49.135972","bumpedAt":"2024-05-14 15:12:24.3939","views":194,"postsCount":2,"highestPostNumber":2,"likeCount":1,"closed":false,"pinned":false,"pinnedGlobally":false,"pinnedAt":null,"pinnedUntil":null,"isBanner":false,"excerpt":"这一行是循环外计算最后结果的，加入后 cpe 会从 1.0x 增加到 1.5x，想请问 cpe 会增加这么多的原因，是因为 measure 与最后结果的正确性有关吗？","deletedAt":null,"isAnonymous":false,"category":{"id":58,"name":"计算机系统导论","slug":"ics","color":"3AB54A"},"author":{"id":3726,"username":"fanmo","name":"fanmo","avatarUrl":null},"tags":[]},"posts":[{"id":32219,"postNumber":1,"raw":"这一行是循环外计算最后结果的，加入后 cpe 会从 1.0x 增加到 1.5x，想请问 cpe 会增加这么多的原因，是因为 measure 与最后结果的正确性有关吗？\n[grid mode=\"tile\"]\n![1|690x251](/uploads/image/11/3b/113b46ba82e5ed1fabe6653757e85645dc3487f240fddf924554e035e7dceabf.avif)\n![2|690x275](/uploads/image/71/be/71be1542595825b67063dca3602134295ea9020c660056d917be96172de9738b.avif)\n[/grid]","cooked":"

这一行是循环外计算最后结果的，加入后 cpe 会从 1.0x 增加到 1.5x，想请问 cpe 会增加这么多的原因，是因为 measure 与最后结果的正确性有关吗？

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\n","createdAt":"2024-05-14 12:43:49.230975","updatedAt":"2024-05-14 12:43:49.230975","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":62,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":3726,"username":"fanmo","name":"fanmo","avatarUrl":null,"admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":32244,"postNumber":2,"raw":"这种操作会在每次循环中都读取和写入一遍 `result` 指向的内存，应当创建一个存储在 register 上的 local variable 来保存更新数据，并只在得到最终结果后写入一次来进行优化。","cooked":"

这种操作会在每次循环中都读取和写入一遍 result 指向的内存，应当创建一个存储在 register 上的 local variable 来保存更新数据，并只在得到最终结果后写入一次来进行优化。

\n","createdAt":"2024-05-14 15:12:24.3939","updatedAt":"2024-10-25 11:20:57.14103","replyToPostNumber":null,"replyCount":0,"likeCount":1,"wordCount":68,"liked":false,"bookmarked":false,"polls":[],"reactions":[{"reaction":"❤️","count":1,"users":[{"id":3373,"username":"zxia","name":null}],"hasReacted":false}],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":6205,"username":"uika_winwing","name":null,"avatarUrl":"/uploads/image/76/3b/763b1e5ad8a424c4450bb26cea5ae532e7b1cd9da926ac5d99215d7123bf6002.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}}],"hasMore":false,"lastReadPostNumber":2,"hasUrlPostNumber":true}