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@shafik
shafik / WhatIsStrictAliasingAndWhyDoWeCare.md
Last active May 8, 2024 17:59
What is Strict Aliasing and Why do we Care?

What is the Strict Aliasing Rule and Why do we care?

(OR Type Punning, Undefined Behavior and Alignment, Oh My!)

What is strict aliasing? First we will describe what is aliasing and then we can learn what being strict about it means.

In C and C++ aliasing has to do with what expression types we are allowed to access stored values through. In both C and C++ the standard specifies which expression types are allowed to alias which types. The compiler and optimizer are allowed to assume we follow the aliasing rules strictly, hence the term strict aliasing rule. If we attempt to access a value using a type not allowed it is classified as undefined behavior(UB). Once we have undefined behavior all bets are off, the results of our program are no longer reliable.

Unfortunately with strict aliasing violations, we will often obtain the results we expect, leaving the possibility the a future version of a compiler with a new optimization will break code we th

@application2000
application2000 / how-to-install-latest-gcc-on-ubuntu-lts.txt
Last active May 7, 2024 10:38
How to install latest gcc on Ubuntu LTS (12.04, 14.04, 16.04)
These commands are based on a askubuntu answer http://askubuntu.com/a/581497
To install gcc-6 (gcc-6.1.1), I had to do more stuff as shown below.
USE THOSE COMMANDS AT YOUR OWN RISK. I SHALL NOT BE RESPONSIBLE FOR ANYTHING.
ABSOLUTELY NO WARRANTY.
If you are still reading let's carry on with the code.
sudo apt-get update && \
sudo apt-get install build-essential software-properties-common -y && \
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && \
@aliostad
aliostad / stockfish-interface.txt
Created August 17, 2019 10:41
stockfish - Description of the universal chess interface (UCI)
COPIED FROM https://build.opensuse.org/package/view_file/games/stockfish/stockfish-interface.txt?expand=1
Description of the universal chess interface (UCI) April 2006
=================================================================
* The specification is independent of the operating system. For Windows,
the engine is a normal exe file, either a console or "real" windows application.
* all communication is done via standard input and output with text commands,
@seffs
seffs / raspbian-bookworm-minimal-kiosk.md
Last active April 16, 2024 21:49
Raspbian Bookworm - Ultra Minimal Kiosk Setup

This was tested on a fresh Raspbian Bookworm Lite installation. Proceed with caution.

EDIT 23/12/2023: Removed dead download link and added own release


First Steps

Install core packages

sudo apt install wayfire seatd

@joshschmelzle
joshschmelzle / remove-gamebar-powershell-win10.md
Last active April 3, 2024 14:09
How to Remove the Xbox Game Bar with Powershell on Windows 10

You've probably stumbled upon this researching how to remove the Xbox Game Bar. This gist includes a few different methods you can try. Please note that some of these first options are probably not be available unless you are running an older version of Windows 10.

Uninstalling/Removing the Game Bar (old Windows 10 build GUI options)

(this is no longer an option on any recent Windows 10 build)

  1. Press Windows Key or click on the Start menu.
  2. Start typing Xbox or Game Bar, until you get the Xbox Game Bar app to appear in the results.
  3. Right-click on the app and pick Uninstall. Answer Yes to the prompt, and wait for the process to finish.
/* fix_fft.c - Fixed-point in-place Fast Fourier Transform */
/*
All data are fixed-point short integers, in which -32768
to +32768 represent -1.0 to +1.0 respectively. Integer
arithmetic is used for speed, instead of the more natural
floating-point.
For the forward FFT (time -> freq), fixed scaling is
performed to prevent arithmetic overflow, and to map a 0dB
sine/cosine wave (i.e. amplitude = 32767) to two -6dB freq
@tuttlem
tuttlem / test.c
Created December 28, 2013 06:41
freeglut simple
#include <GL/glut.h>
void resize(int width, int height) {
// avoid div-by-zero
if (height == 0) {
height = 1;
}
// calculate the aspect ratio
@holms
holms / gist:5005629
Last active December 21, 2023 16:10
midnight commander dark color theme
Edit mc’s ini file (either ~/.mc/ini or ~/.config/mc/ini) and look for the line [Colors]. Then, change the line base_color to this:
[Colors]
base_color=linux:normal=white,black:marked=yellow,black:input=,green:menu=black:menusel=white:menuhot=red,:menuhotsel=black,red:dfocus=white,black:dhotnormal=white,black:dhotfocus=white,black:executable=,black:directory=white,black:link=white,black:device=white,black:special=white,black:core=,black:stalelink=red,black:editnormal=white,black