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Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?

... @PeterCordes microarchitecture.pdf: This gives a delay of 5 - 6 clocks. The reason is that a temporary register has been assigned to AL to make it independent of AH. The execution unit has to wait until the write to AL has retired before it is possible to ...
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Convert light frequency to RGB?

... color component transfer function is taken from http://www.color.org/srgb.pdf, which * follows the International Electrotechnical Commission standard IEC 61966-2-1 "Multimedia systems and equipment - * Colour measurement and management - Part 2-1: Colour management - Default RGB colour space - sR...
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How to upload files to server using JSP/Servlet?

...ces have failed hard in this, such as roseindia.net. See also uploading of pdf file. You should rather use a real library which is used (and implicitly tested!) by millions of users for years. Such a library has proven its robustness. When you're already on Servlet 3.0 or newer, use native API If ...
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Why doesn't C++ have a garbage collector?

...-fledged one. Recommended reading if only I could put my hands back on the PDF file... 2. Resources Acquisition Is Initialization (RAII) It's a common idiom in C++ that you will wrap the ownership of resources within an object to ensure that they are properly released. It's mostly used for memory ...
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How to check if two arrays are equal with JavaScript? [duplicate]

...somorphism problem http://logic.pdmi.ras.ru/~smal/files/smal_jass08_slides.pdf - fortunately it's not as hard as general graph isomorphism; there is in fact an O(#vertices) algorithm to solve it, but it can get very complicated to do it efficiently. The pathological case is if you have a set made up...
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Are Exceptions in C++ really slow

...for more details, read the TR18015 report, chapter 5.4 Exception Handling (pdf) So, yes, exceptions are slow on the exceptional path, but they are otherwise quicker than explicit checks (if strategy) in general. Note: Andrei Alexandrescu seems to question this "quicker". I personally have seen thi...
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基于PECL OAuth打造微博应用 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...却发现平台质量良莠不齐,有很多不完善的地方,就拿PHPSDK来说吧,多半都是用TwitterOAuth改的,一旦多平台集成,很容易出现命名冲突之类的问题。 既然官方SDK不给力,那我们只能发扬自力更生的革命精神了!好消息是PHP本...
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Which characters make a URL invalid?

...ia.org/wiki/Möbius_strip or https://zh.wikipedia.org/wiki/Wikipedia:关于中文维基百科/en. First, a digression into terminology. What are these addresses? Are they valid URLs? Historically, the answer was "no". According to RFC 3986, from 2005, such addresses are not URIs (and therefore no...
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你真的了解熊市有多么可怕吗? - 创意 - 清泛网 - 专注C/C++及内核技术

...公司大厅空无一人,除了工作人员已经没人。报纸的证券越来越小,电视的证券节目全部都在深夜,新闻已经不再报道行情,因为天天都是跌。 每天出现的股评高手,说的都是如何杀跌换股,短线操作而不是持有。 每隔几...
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Skip List vs. Binary Search Tree

...mentations. I'll summarize their findings. It's worth it to download the pdf as it has some very informative graphs on pages 50, 53, and 54. Locking skip lists are insanely fast. They scale incredibly well with the number of concurrent accesses. This is what makes skip lists special, other loc...