How Do I Boost Difftastic By 4x

Difftastic is a structural diff that understands syntax. The diff results it generates are very fancy, but its performance is poor, and it consumes a lot of memory. Recently, I boosted it by 4x while using only 29% of memory (#393, #395, #401). This post explains how I accomplished this. Hope it can bring you some inspiration. When I started to write this post, not all optimizations were reviewed and merged....

October 6, 2022 · QuarticCat

RVV May Not Be as Good as You Think

As an emerging ISA, RISC-V learns a lot from its predecessors’ mistakes and brings some very appealing designs. In my circles, RISC-V is frequently associated with the words “modern” and “elegant”. Its vector extension (RVV) is often given equivalent praise, even though nearly no one has used a real-world RVV machine (including me) or even programmed in RVV. After experimenting with RVV for a while, I feel that it is not as good as many people claimed....

February 27, 2022 · QuarticCat

One More Nasty Design of C++'s Name Lookup

As we all know that C++’s name lookup has always been extremely counter-intuitive. The infamous argument-dependent lookup (ADL), for example, often leads to unexpected behavior and, worse yet, is often difficult to troubleshoot. This can happen when you define a function in your current namespace, but when you call it the compiler selects another function with the same name thousands of miles away, even though you did not using that foreign function in the current namespace....

June 23, 2021 · QuarticCat

How To Read C++ Types

The readability of C++’s types is terrible, and most beginner tutorials don’t go into detail about how to read them. They at most discuss the difference between top-level const and low-level const. Many of my friends have asked me about this, and I’ve talked about it numerous times. So I thought, why not write a blog post on it? A Common Misconception Before talking about type reading in detail, I’d like to address a common misconception....

February 13, 2021 · QuarticCat