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Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?
... in the branch prediction table
moving the branch eliminated the alias and allowed the branch to be predicted correctly
Your Core2 doesn't keep a separate history record for each conditional jump. Instead it keeps a shared history of all conditional jumps. One disadvantage of global branch predic...
解决WaitForSingleObject阻塞UI线程的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
解决WaitForSingleObject阻塞UI线程的问题WaitForSingleObjec 等待线程结束时会阻塞UI线程，导致界面不响应鼠标操作。解决原理：等待过程中对消息队列中消息进行转发处理。代码如下...WaitForSingleObjec 等待线程结束时会阻塞UI线程，导致...
“媒”出路？如今“媒体+行业”创业机会多得是 - 资讯 - 清泛网 - 专注C/C+...
...收益变现而产生回报，彻底颠覆了传统意义上对媒体功能定位和价值实现模式的认知。
“媒体+行业”的基本方法论
第一阶段：
选择一个拥有较大市场规模和受众用户的传统行业细分领域，建立针对甲方、乙方以及第三方等...
lua和c/c++互相调用实例分析 - C/C++ - 清泛网 - 专注C/C++及内核技术
..."栈"上，然后获取数据，栈中的每个数据通过索引值进行定位，索引值为正时表示相对于栈底的偏移索引，索引值为负时表示相对于栈顶的偏移索引，索引值以1或-1为起始值，因此栈顶索引值永远为-1 ,栈底索引值永远为1 。 "栈"...
[工程源码实例] C++ ADO 读写Excel源码及注意点 - C/C++ - 清泛网 - 专注C/C++及内核技术
...貌似找不到驱动，有解决的烦请评论告知下，谢谢。
3、定位单元格可以用整数索引，也可以用字符串列名（第一行的文字）。
4、SELECT * FROM [中文Sheet名$] 中文Sheet名后要加"$"。
5、单元格为空的话，v.vt 值为 VT_NULL。|1454|1455C...
调研结论：File组件写log文件大小有上限吗？会无限增长吗？（附日志轮转方...
...og_20260922.txt。每天一个新文件，天然有上限，历史日志好定位。用 Clock 组件取当前日期拼进文件名即可。
方案2：按行数/条数轮转
App里维护一个计数器变量，每写一条+1；超过阈值（如5000条）就换新文件名（log_2.txt），并清...
How efficient is locking an unlocked mutex? What is the cost of a mutex?
... access to the object happens often, then multiple locks would increase parallelism. At the cost of maintainability, since more locking means more debugging of the locking.
How efficient is it to lock a mutex? I.e. how much assembler instructions are there likely and how much time do they take (...
Programmatically find the number of cores on a machine
...ne, if a system is capable of turning some off they might not be counted. Calling sysconf with "_SC_NPROCESSORS_CONF" will return the total CPUs configured.
– Chris S
Apr 23 '11 at 18:43
...
How to count the number of set bits in a 32-bit integer?
...Hamming Weight', 'popcount' or 'sideways addition'.
The 'best' algorithm really depends on which CPU you are on and what your usage pattern is.
Some CPUs have a single built-in instruction to do it and others have parallel instructions which act on bit vectors. The parallel instructions (like x86's ...
Difference between global and device functions
...
__global__ - Runs on the GPU, called from the CPU or the GPU*. Executed with <<<dim3>>> arguments.
__device__ - Runs on the GPU, called from the GPU. Can be used with variabiles too.
__host__ - Runs on the CPU, called from the CPU.
*) __global__ funct...