Ankit sudoankit

Here's a list of mildly interesting things about the C language that I learned mostly by consuming Clang's ASTs. Although surprises are getting sparser, I might continue to update this document over time.

There are many more mildly interesting features of C++, but the language is literally known for being weird, whereas C is usually considered smaller and simpler, so this is (almost) only about C.

1. Combined type and variable/field declaration, inside a struct scope [https://godbolt.org/g/Rh94Go]

struct foo {
   struct bar {
 int x;

High-Performance Matrix Multiplication

This is a short post that explains how to write a high-performance matrix multiplication program on modern processors. In this tutorial I will use a single core of the Skylake-client CPU with AVX2, but the principles in this post also apply to other processors with different instruction sets (such as AVX512).

Intro

Matrix multiplication is a mathematical operation that defines the product of

First Method

Deleting the .git folder may cause problems in our git repository. If we want to delete all of our commits history, but keep the code in its current state, try this:

# Check out to a temporary branch:
git checkout --orphan TEMP_BRANCH

# Add all the files:
git add -A

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

General rules

Follow standard conventions.
Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
Boy scout rule. Leave the campground cleaner than you found it.
Always find root cause. Always look for the root cause of a problem.

	class Python < Formula
	desc "Interpreted, interactive, object-oriented programming language"
	homepage "https://www.python.org/"
	url "https://www.python.org/ftp/python/3.8.6/Python-3.8.6.tar.xz"
	sha256 "a9e0b79d27aa056eb9cce8d63a427b5f9bab1465dee3f942dcfdb25a82f4ab8a"
	head "https://github.com/python/cpython.git"
	license "Python-2.0"
	revision 1

	bottle do

	#!/bin/sh
	# add this to your bitbar directory
	# don't forget to chmod +x


	# width and characters for the progress bars
	# feel free to configure these
	width=30
	fill_char="█"
	empty_char="▁"

	#!/bin/bash
	for i in *.djvu;
	do ddjvu -format=pdf "$i" "${i/%.djvu/}.pdf" && rm $i
	done

	g++ `pkg-config --cflags --libs opencv` $1 -o $2 `pkg-config --cflags --libs opencv`

	# $1 = yourprogram.cpp
	# $2 = executable output name; yourprogram

	# save the file in your directory
	# $chmod +x cv-compile.sh
	# $sh cv-compile $1 $2

	# Caveats

Ankit sudoankit

1. Combined type and variable/field declaration, inside a struct scope [https://godbolt.org/g/Rh94Go]

High-Performance Matrix Multiplication

Intro

First Method

General rules

Design rules

Orthodox C++

This article has been updated and is available here.