bitwiseの検索結果1 - 3 件 / 3件

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  Bitwise division

  • 4 users
  • h14s.p5r.org
  • テクノロジー
  • 2023/03/01

  Integer division is expensive. Much more expensive than multiplication. Much, much more expensive than addition. If you’re trying to make some integer operations really fast it’s bad news if you need to do division. A while ago, for a hobby project, I happened to be playing around with variable-length integer encodings. Where you store integers such that small ones take up less space than large on

  
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  Demystifying bitwise operations, a gentle C tutorial

  • 4 users
  • www.andreinc.net
  • テクノロジー
  • 2023/03/04

  This tutorial is in early draft. If you see any errors, feedback is greatly appreciated. Bitwise operations are a fundamental part of Computer Science. They help Software Engineers to have a deeper understanding of how computers represent and manipulate data, and they are crucial when writing performance-critical code. Truth being said, nowadays, they are rarely used in the business code we write,
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  Bitwise Binary Search: Elegant and Fast | orlp.net

  • 3 users
  • orlp.net
  • テクノロジー
  • 2023/05/19

  I recently read the article Beautiful Branchless Binary Search by Malte Skarupke. In it they discuss the merits of the following snippet of C++ code implementing a binary search: template<typename It, typename T, typename Cmp> It lower_bound_skarupke(It begin, It end, const T& value, Cmp comp) { size_t length = end - begin; if (length == 0) return end; size_t step = bit_floor(length); if (step !=

  • Algorithm