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Why does changing 0.1f to 0 slow down performance by 10x?
...ond run the numbers are very close to zero.
Denormalized numbers are generally rare and thus most processors don't try to handle them efficiently.
To demonstrate that this has everything to do with denormalized numbers, if we flush denormals to zero by adding this to the start of the code:
_MM_...
How can I output a UTF-8 CSV in PHP that Excel will read properly?
...l for Mac does not currently support UTF-8
Update, 2017: This is true of all versions of Microsoft Excel for Mac before Office 2016. Newer versions (from Office 365) do now support UTF-8.
In order to output UTF-8 content that Excel both on Windows and OS X will be able to successfully read, you w...
+ operator for array in PHP?
...ced by php.net doesn't have a formal spec, but both the + and array_merge call zend_hash_merge under the hood. This is also expected, since in PHP arrays are implemented as ordered hash maps.
– bishop
May 19 '15 at 18:34
...
How can I transform between the two styles of public key format, one “BEGIN RSA PUBLIC KEY”, the oth
...s of two numbers:
the modulus (e.g. a 2,048 bit number)
the exponent (usually 65,537)
Using your RSA public key as an example, the two numbers are:
Modulus: 297,056,429,939,040,947,991,047,334,197,581,225,628,107,021,573,849,359,042,679,698,093,131,908,015,712,695,688,944,173,317,630,555,849,7...
蜘蛛的故事 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...下来，问这只蜘蛛：“你我相见总算是有缘，我来问你个问题，看你修炼了这一千多年来，有什么真知拙见。怎么样？”蜘蛛遇见佛主很是高兴，连忙答应了。佛主问到：“世间什么才是最珍贵的？”蜘蛛想了想，回答到：“世...
解决：无法通过windows installer服务安装此安装程序包。您必须安装带有更...
...必须安装带有更新版本windows installer服务的Windows出现这个问题不让安装程序，可...
无法通过windows installer服务安装此安装程序包。您必须安装带有更新版本windows installer服务的Windows。
出现这个问题不让安装程序，可以到微软网...
解决：参数 basepath 不能是相对路径？？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...改动或手动设置参数后项目路径发生了变更都会出现这个问题。项目属性 -> 配置 -> 调试：改成上图（即VS默认配置）即...由于手动将调试参数改动或手动设置参数后项目路径发生了变更都会出现这个问题。
项目属性 -> 配置 ->...
此诊断出现在编译器生成的函数“CGdiObject &CGdiObject::operator =(const...
...“CGdiObject &CGdiObject::operator =(const CGdiObject &)”中出现此类问题是对象赋值导致，因为没有重载=赋值操作符。由于不会提示具体错误行，因此需要仔细查看对象直接赋值的地方。改为指针赋值就没...出现此类问题是对象赋值导致...
MFC MDI程序的窗口菜单无法正确显示 - C/C++ - 清泛网 - 专注C/C++及内核技术
MFC MDI程序的窗口菜单无法正确显示问题的原因，是自己创建的菜单资源中没有任何一个子菜单被mfc框架认为是window子菜单，因此也就没有响应修改子菜单的内容。mfc的判断标准其...问题的原因，是自己创建的菜单资源中没有任...
十张图带你入门Map/Reduce - C/C++ - 清泛网 - 专注C/C++及内核技术
...将是并行操作。显而易见：你可以使用扩展来解决并发性问题。
举个例子：如果你有一张记录了城市的表格，而每个城市都有两个属性 —— 所属州和城市年度平均温度。比如：San Francisco：{CA，58}。现在你想计算每年的平均温...