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Foreward

This document was originally written several years ago. At the time I was working as an execution core verification engineer at Arm. The following points are coloured heavily by working in and around the execution cores of various processors. Apply a pinch of salt; points contain varying degrees of opinion.

It is still my opinion that RISC-V could be much better designed; though I will also say that if I was building a 32 or 64-bit CPU today I'd likely implement the architecture to benefit from the existing tooling.

Mostly based upon the RISC-V ISA spec v2.0. Some updates have been made for v2.2

Original Foreword: Some Opinion

The RISC-V ISA has pursued minimalism to a fault. There is a large emphasis on minimizing instruction count, normalizing encoding, etc. This pursuit of minimalism has resulted in false orthogonalities (such as reusing the same instruction for branches, calls and returns) and a requirement for superfluous instructions which impacts code density both in terms of size and

	WAYLAND_PROTOCOLS=/usr/share/wayland-protocols

	# wayland-scanner is a tool which generates C headers and rigging for Wayland
	# protocols, which are specified in XML. wlroots requires you to rig these up
	# to your build system yourself and provide them in the include path.
	xdg-shell-protocol.h:
	wayland-scanner server-header \
	$(WAYLAND_PROTOCOLS)/stable/xdg-shell/xdg-shell.xml $@

	xdg-shell-protocol.c: xdg-shell-protocol.h

	/*
	* Minimal .NET Forth implementation. Just an experiment. Do not use for anything serious.
	* by Tycho Luyben (https://github.com/tluyben)
	*
	* The only 'primitive' (built-in) is an foreign function interface word which allows you to define
	* whatever is needed, for example:
	*
	* hello System.String System.Console.WriteLine ffi
	*
	* will print hello.

	// Jeff Preshing's example that shows the reordering of Intel CPUs made to
	// work on both Linux and macOS.
	//
	// Original source:
	//
	// https://preshing.com/20120515/memory-reordering-caught-in-the-act/
	//
	// Apple semaphore change is based on the answer by dho at:
	//
	// https://stackoverflow.com/questions/27736618/why-are-sem-init-sem-getvalue-sem-destroy-deprecated-on-mac-os-x-and-w

	const std = @import("std");

	pub fn main() !void {
	const argv = try std.process.argsAlloc(std.heap.page_allocator);
	defer std.process.argsFree(std.heap.page_allocator, argv);

	const result = forth("a b +", .{
	.a = try std.fmt.parseInt(i32, argv[1], 10),
	.b = try std.fmt.parseInt(i32, argv[2], 10),
	});

	# I use MacOS VMs from github for iOS development.
	# By no suprise they are a bit slow and have a lot of things I don't use
	# Hence this script for lighter and better VM for my iOS development and builds
	# GUI and animation related things to tweak
	defaults write NSGlobalDomain NSAutomaticWindowAnimationsEnabled -bool false
	defaults write NSGlobalDomain NSWindowResizeTime -float 0.001
	defaults write -g QLPanelAnimationDuration -float 0
	defaults write com.apple.dock autohide-time-modifier -float 0
	defaults write com.apple.dock launchanim -bool false
	sudo sysctl debug.lowpri_throttle_enabled=0

	default:
	cc ccsmtp.c -o ccsmtpd -lpthread

	default:
	cc ccsmtp.c -o ccsmtpd -lpthread