micro-optimization

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Overhead of calling tiny functions from a tight inner loop? [C++]

Say you see a loop like this one: for(int i=0; i<thing.getParent().getObjectModel().getElements(SOME_TYPE).count();[详细]

2022-12-25 01:11 分类：问答
Ever any performance different between Java >> and >>> right shift operators?

Is there ever reason to think the >> (signed) and >>> (unsigned) right bit-shift operators in Java would perform differently? I can\'t detect any difference on my machine.[详细]

2022-12-25 00:12 分类：问答
Cost of exception handlers in Python

In another question, the accepted answer suggested replacing a (very cheap) if statement in Python code with a try/except block to improve performance.[详细]

2022-12-24 22:27 分类：问答
x86 opcode alignment references and guidelines

I\'m generating some opcodes dynamically in a JIT compiler and I\'m looking for guidelines for opcode alignment.[详细]

2022-12-24 16:17 分类：问答
When, if ever, is loop unrolling still useful?

I\'ve been trying to optimize some extremely performance-critical code (a quick sort algorithm that\'s being called millions and millions of times inside a monte carlo simulation) by loop unrolling.He[详细]

2022-12-21 06:15 分类：问答
Is the conditional operator slow?

I was looking at some code with a huge switch statement and an if-else statement on each case and instantly felt the urge to optimize. As a good developer always should do I set out to get some hard t[详细]

2022-12-20 15:42 分类：问答
Micro-optimizations in C, which ones are there? Is there anyone really useful? [closed]

Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this[详细]

2022-12-17 10:59 分类：问答
CPU-Core thread classification Function

I\'m going to be writing a multi-threaded shared memory messaging system for ultra high-volume message delivery between processes. The messages will originate from the worker threads of a web-server.[详细]

2022-12-16 14:50 分类：问答
Verifying compiler optimizations in gcc/g++ by analyzing assembly listings

I just asked a question related to how the compiler optimizes certain C++ code, and I was looking around SO for any questions about how to verify that the compiler has performed certai开发者_JAVA技巧n[详细]

2022-12-15 20:29 分类：问答
Python if else micro-optimization

In pondering optimization of code, I was wondering which was more expensive in python: if x: d = 1 else:[详细]

2022-12-15 06:36 分类：问答