micro-optimization

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AND faster than integer modulo operation?

It is possible to re-express: i % m as: i & (m-1) where, i is an unsigned integer m is a power of 2 My question is: is the AND operation any faster? Don\'t modern CPUs support integer[详细]

2023-04-11 10:46 分类：问答
Efficient PHP date comparison

I\'m trying to write a function that will return the number of days between two dates as quickly as possible. This function gets called thousands ofa million times in my code and optimizing it to the[详细]

2023-04-11 02:04 分类：问答
Flex SQLite optimization: adding database name in front of tables

This article on Livedocs says you should add the database name in front of tables. http://help.adobe.com/en_US/AIR/1.5/devappsflex/WS5b3ccc516d4fbf351e63e3d118666ade46-7d47.html[详细]

2023-04-06 03:04 分类：问答
while (n > 1) is 25% faster than while (n)?

I have two logically equivalent functions: long ipow1(int base, int exp) { // HISTORICAL NOTE: // This wasn\'t here in the original question, I edited it in,[详细]

2023-04-06 00:24 分类：问答
Performance of delegate()

I\'ve been using $(\"body\").delegate(\".selector\", \"click\", function() { ... }); for a while now, and I was wondering: If I delegate the click event to a containing element closer to the actual el[详细]

2023-04-04 06:15 分类：问答
SSE micro-optimization instruction order

I have noticed that sometimes MSVC 2010 doesn\'t reorder SSE instructions at all. I thought I didn\'t have to care about instruction order inside my loop since the compiler handles that best, which do[详细]

2023-04-01 22:08 分类：问答
Is there a tool to test the conciseness of c program? [closed]

Closed. This question is seeking recommendations for books, tools, software libraries, and more. It does not meet Stack Overflow guidelines. It is not currently accepting answers.[详细]

2023-03-31 20:38 分类：问答
Fastest way to strip all non-printable characters from a Java String

What is the fastest way to strip all non-printable characters from a String in Java? So far I\'ve tried and measured on 138-byte, 131-character String:[详细]

2023-03-30 06:08 分类：问答
Fast method to copy memory with translation - ARGB to BGR

Overview I have an image buffer that I need to convert to another format.The origin image buffer is four channels, 8 bits per channel, Alpha, Red, Green, and Blue.The destination buffer is three chann[详细]

2023-03-22 17:14 分类：问答
Which is more efficient between __autoload() or include/require?

Whic开发者_如何学运维h has faster execution time: __autoload or include inside nested if statements?[详细]

2023-03-22 12:59 分类：问答