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When is assembly faster than C?
... uint64_t for 32x32 => 64-bit multiplies fails to optimize on a 64-bit CPU, so you need intrinsics or __int128 for efficient code on 64-bit systems.
_umul128 on Windows 32 bits: MSVC doesn't always do a good job when multiplying 32-bit integers cast to 64, so intrinsics helped a lot.
C does...
How does Java handle integer underflows and overflows and how would you check for it?
...r absolute value than the computer can actually represent in memory on its CPU. So underflow does not apply to Java Integers. @BalusC
– Jingguo Yao
Oct 14 '18 at 15:10
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Image comparison - fast algorithm
... it would require an array of 1 million 64-bit hash values (8 MB). On some CPUs this fits in the L2/L3 cache! In practical usage I have seen a corei7 compare at over 1 Giga-hamm/sec, it is only a question of memory bandwidth to the CPU. A 1 Billion-image database is practical on a 64-bit CPU (8GB RA...
What's the difference between utf8_general_ci and utf8_unicode_ci?
...ligible. It was devised in a time when servers had a tiny fraction of the CPU performance of today's computers.
Benefits of utf8mb4_unicode_ci over utf8mb4_general_ci
utf8mb4_unicode_ci, which uses the Unicode rules for sorting and comparison, employs a fairly complex algorithm for correct sortin...
asynchronous vs non-blocking
...ng (you can say that most of time this loop does something nonsense but in CPU's eyes, X is running, which means that X is non-blocking) whereas X and Y are synchronous because X can't continue to do any other things(X can't jump out of the loop) until it gets the book from Y.
Normally in this case,...
Microsecond timing in JavaScript
...lps me invalidate results that has probably been too adversely affected by CPU fluctuations).
It's become so accurate in some GPU accelerated browsers on i7 quad-core systems (when the browser window is the only window), that I've found I wished I could access a 0.1ms precision timer in JavaScript,...
What belongs in an educational tool to demonstrate the unwarranted assumptions people make in C/C++?
...ing further might break if incrementing the pointer causes an overflow, on CPU's which don't just treat pointers as integers.
– jalf
Aug 11 '10 at 14:32
add a comment
...
Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
...differ by a a multiple of 4096 have a false dependency on Intel SnB-family CPUs. (i.e. same offset within a page). This can reduce throughput when some of the operations are stores, esp. a mix of loads and stores.
– Peter Cordes
Mar 18 '16 at 1:52
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防挂马：apache禁止访问文件或目录执行权限、禁止运行脚本PHP文件的设置方...
... </FilesMatch>
</Directory>
这些配置表面上看起来是没什么问题的，确实在windows下可以这么说。
但是Linux就不同了，大家都是知道的linux操作系统是区分大小写的，这里如果换成大写后缀名*.phP一类就pass了
这里我说下我个人的解...
半个汉字的校验与处理(C++) - C/C++ - 清泛网 - 专注C/C++及内核技术
...导致xml解析失败，或者sql执行错误的异常。为了解决这个问题，有必要找到并删除半个汉字，或者存放的时候，即便截断，也不产生新的半个汉字。
以下是我近期对半个汉字的处理，C++代码如下：
// strSrc: 原始字符串
// n...