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Dynamic PGO in .NET 6.0

Dynamic PGO (Profile-guided optimization) is a JIT-compiler optimization technique that allows JIT to collect additional information about surroundings (aka profile) in tier0 codegen in order to rely on it later during promotion from tier0 to tier1 for hot methods to make them even more efficient.

What exactly PGO can optimize for us?

Profile-driving inlining - inliner relies on PGO data and can be very aggressive for hot paths and care less about cold ones, see dotnet/runtime#52708 and dotnet/runtime#55478. A good example where it has visible effects is this StringBuilder benchmark:
Guarded devirtualization - most monomorphic virtual/interface calls can be devirtualized using PGO data, e.g.:

void DisposeMe(IDisposable d)

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THE ORIGINAL ROFLCOPTER

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Travis CI - GitHub Satellite 2019

	pacman -S --needed git base-devel
	git clone https://aur.archlinux.org/yay.git
	cd yay
	makepkg -si

	yay -S flutter

	java -version

	sudo pacman -S jre8-openjdk

	// Written by Theodore Tsirpanis.
	// Licensed under the CC0 license.
	// SPDX-License-Identifier: CC0-1.0

	using System.Buffers;

	#nullable enable

	/// <summary>
	/// Manages temporary buffers with low GC pressure.

	// simplest file logger in c++
	#include <fstream>
	//#include <iostream>
	static void LOG(char* message) {
	//std::cout << message << std::endl;
	std::fstream fs;
	fs.open("log.txt", std::fstream::in \| std::fstream::out \| std::fstream::app);
	fs << message;
	fs << "\n";
	fs.close();

	using System;
	using System.Collections;
	using System.Collections.Generic;
	using UnityEngine;

	public class PhysicsMovement : MonoBehaviour
	{
	[SerializeField] private float _minGroundNormalY = .65f;
	[SerializeField] private float _gravityModifier = 1f;
	[SerializeField] private Vector2 _velocity;

	using System;
	using System.IO;
	using System.IO.Compression;
	using System.Text;

	namespace TarExample
	{

	public class Tar
	{

	Shader

	layout (location = 0) in vec3 inPos;
	layout (location = 1) in vec3 inColor;
	layout (location = 2) in vec3 inPosB;
	layout (location = 3) in vec3 inColorB;

	...

	Application