micro-optimization

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Fastest way to convert unsigned char 8 bits to actual numbers

I am using an unsigned char to store 8 flags. Each flag represents the corner of a cube. So 00000001 will be corner 1 010001开发者_C百科00 will be corners 3 and 7 etc. My current solution is to &[详细]

2023-01-25 06:16 分类：问答
Floating point division vs floating point multiplication

Is there any (non-mi开发者_如何学Pythoncrooptimization) performance gain by coding float f1 = 200f / 2[详细]

2023-01-24 04:37 分类：问答
can array access be optimized?

Maybe I\'m being misled by my profiler (Netbeans), but I\'m seeing some odd behavior, hoping maybe someone here can help me understand it.[详细]

2023-01-23 21:42 分类：问答
Why are DateTime.Now DateTime.UtcNow so slow/expensive

I realize this is way too far into the micro-optimization area, but I am curious to understand why Calls to DateTime.Now and DateTime.UtcNow are so \"expensive\". I have a sample program that runs a c[详细]

2023-01-22 20:17 分类：问答
MIPS (curiosity) faster way of clearing a register?

What is the fastest way of clearing a register (=0) in MIPS assembly? Some examples: xor开发者_如何学编程$t0, $t0, $t0[详细]

2023-01-21 19:56 分类：问答
Is it worth writing part of code in C instead of C++ as micro-optimization?

I am wondering if it is still worth with modern compilers and their optimizations to write some critical code in C instead of C++ to make it faster.[详细]

2023-01-20 19:21 分类：问答
Use of lazy val for caching string representation

I encountered the following code in JAXMag\'s 开发者_开发知识库Scala special issue: package com.weiglewilczek.gameoflife[详细]

2023-01-19 15:39 分类：问答
Is it possible to have only one comparison per iteration of a binary search algorithm?

In binary search algorithm we have two comparisons: if (开发者_运维问答key == a[mid]) then found;[详细]

2023-01-11 17:16 分类：问答
Is there any point in creating a second column optimized for FULLTEXT searches?

the project I\'m working on has for each column that needs to be searched a second column called \"ft[columnname]\" which has a FULLTEXT index and only this one is searched against.[详细]

2023-01-11 12:43 分类：问答
optimizing a lookup

I have an array that i use to lookup values. I use the first 2 values to get n rows. for example all rows that have 2 in the first column and 7 in the second.[详细]

2023-01-10 03:54 分类：问答