micro-optimization

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C programming and error_code variable efficiency

Most code I have ever read uses a int for standard error handling (return values from functions and such). But I am wondering if there is any benefit to be had from using a uint_8 will a compiler -- r[详细]

2022-12-13 13:14 分类：问答
Is it possible to tell the branch predictor how likely it is to follow the branch?

Just to make it clear, I\'m not going for any sort of portability here, so any solutions that will tie me to a certain box is fine.[详细]

2022-12-13 12:18 分类：问答
What is faster: many ifs, or else if?

I\'m iterating through an array and s开发者_StackOverfloworting it by values into days of the week.[详细]

2022-12-12 17:17 分类：问答
Faster implementation of Math.round?

Are there any drawbacks to this code, which appears to be a faster (and correct) version of java.lang.Math.round?[详细]

2022-12-11 12:50 分类：问答
Bitwise XORing and shifting of integer arrays

Suppose a bit sequence of size M, and another bit sequence of size N, with M >> N. Both M and N can be saved inside integer arrays: If N has a length of 30 then an array with only one integer will be[详细]

2022-12-11 03:00 分类：问答
if/else vs ternary operator

Cons开发者_运维问答idering the evaluation time, are following two equivalent? if(condition1) { //code1[详细]

2022-12-10 19:50 分类：问答
Improving the Quick sort

If possible, how can I improve the following quick sort(performance wise). Any suggestions? void main()[详细]

2022-12-10 05:34 分类：问答
Which of these pieces of code is faster in Java?

a) for(int i = 100000; i > 0; i--) {} b) for(int i = 1; i < 100001; i++) {} The answer is there on this website (question 3). I just can\'t figure开发者_运维技巧 out why? From website:[详细]

2022-12-10 03:23 分类：问答
CSS micro-optimization

I\'m considering micro-optimization of a huge CSS stylesheet and have a couple questions related to that:[详细]

2022-12-08 11:40 分类：问答
Unsigned 64x64->128 bit integer multiply on 32-bit platforms

In the context of exploratory activity I have started to take a look at integer & fixed-point arithmetic building blocks for 32-bit platforms. My primary target would be ARM32 (specifically armv7)[详细]

2022-12-07 17:45 分类：问答