前言时间回溯到2016年，在业界盛会hotchips上三星公布了其第一代自研CPU微架构猫鼬M1，大有扛起安卓阵营大旗与苹果Bionic一决雌雄的意味。然而谁能想到彼时意气风发的三星后来在自研之路上却举步维艰。从M1到M5，…

A hash function is a function that maps a value (such as a string) to an integer value. Typically, we want random-looking values. A Bloom filter is a standard data structure in computer science to approximate a set. Basically, you start with a large array…

Summary We propose -fbounds-safety, a C extension to enforce bounds safety to prevent out-of-bounds (OOB) memory accesses, which remain a major source of security vulnerabilities in C. -fbounds-safety aims to eliminate this class of bugs by turning OOB accesses…

We are proud to announce that the migration to Git packaging succeeded! 🥳 Thanks to everyone who has helped during the migration! Package sources are now available on GitLab. Note that the bugtracker is still flyspray and that merge requests are not accepted…

幕间在上篇中我们主要探究了Arm Cortex A710微架构的取指前端和后端执行单元配置，下篇我们继续探究Mid Core、访存子系统、核外系统。（这可真是超级大咕啊，滑稽） JamesAslan：ARM Cortex A710微架构评测（上）…

The Go programming language makes it easy to call C code. Suppose you have the following C functions: char* allocate() { return (char*)malloc(100); } void free_allocated(char *c) { free(c); } Then you can call them from Go as follows: c := C.allocate() C…

In a previous article, we covered Cyberpunk 2077’s “Overdrive” raytracing mode. Rasterization and raytracing are both parallelizable, but raytracing tends to be less predictable. That makes it difficult for GPUs to bring their full parallel processing power…

Pyotr Ilich Tchaikovsky,
Piano Concerto no.3

This Friday morning (2023-05-19) the Git packaging migration will start until Sunday (2023-05-21). The Arch Linux packaging team will not be able to update packages in any of the repositories during this period. Notification when the migration starts, and…

While most of our software relies on Unicode strings, we often still encounter legacy encodings such as Latin 1. Before we convert Latin 1 strings to Unicode (e.g., UTF-8), we must compute the size of the UTF-8 string. It is fairly easy: all ASCII characters…

Modern processors can execute several instructions per cycle. Because processors cannot easily run faster (in terms of clock speed), vendors try to get their processors to do more work per cycle. Apple processors are wide in the sense that they can retire…

Hardware raytracing acceleration has come a long way since Nvidia’s Turing first introduced the technology. Even with these hardware advances, raytracing is so expensive that most games have stuck to very limited raytracing effects, if raytracing is used…

Artificial intelligence (ChatGPT) can provide better answers to patients than physicians. Eating chocolate might affect your brain and cognitive functions. It may not make you smarter, but it might brighten your mood. Obesity may shorten your disease-free…

Whenever you enter a URL into a system, it must be parsed and validated. It is a surprisingly challenging task: it may require hundreds of nanoseconds and possibly over a thousand cycles to parse a typical URL. We can use URL parsing as a reasonable benchmark…