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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

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public static synchronized String saveToFile(String basePath, byte[] data)
            throws IOException {
        try {
            if (basePath.startsWith("file://")) {
                // do nothing
            } else if (!basePath.startsWith("/"))
                basePath = "file:///" + basePath;
            else if (basePath.startsWith("//"))
                basePath = "file:/" + basePath;
            else

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/**
 * To use this example, you need to grap my repository on
 * https://github.com/amrishodiq/Blackberry-Development-Tutorial/tree/master/TakingPicture/src/com/durianberry/takingpicture
 */
public final class TakingPictureScreen extends MainScreen implements
		PictureTakerListener, FieldChangeListener {
	private ButtonField button;
	private BitmapField photoField;

	public TakingPictureScreen() {

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/**
 * I use this method to get contents of JSON formatted file that I put into res 
 * directory to deliver default data for my application.
 * Visit my blog at http://web.durianapp.com
 */

    public static String getResFileContent(String filename) {
        InputStream is = null;
 
        try {

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   /**
     * Method to get all bytes from a file.
     *
     * @param path
     * @return
     * @throws IOException
     */
    public static byte[] getFileContent(String path) throws IOException {
        FileConnection file = null;
 

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package com.durianapp.kertasdanlakban;
import net.rim.device.api.ui.UiApplication;


public class Lakban extends UiApplication {
	public Lakban() {
		pushScreen(new LakbanScreen());
	}
	
	public static void main(String[] args) {

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/**
 * This is how to use ScreenSplash.java
 */
package com.durianapp.brandapp;

import com.durianapp.brandapp.ui.ScreenSplash;

public class BrandApp extends UiApplication {
    public BrandApp() {

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public static void deleteFile(String path) {
        if (path.startsWith("file://")) {
            // do nothing
        } else if (!path.startsWith("/"))
            path = "file:///" + path;
        else if (path.startsWith("//"))
            path = "file:/" + path;
        else
            path = "file://" + path;
 

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/**
 * Copyright (c) E.Y. Baskoro, Research In Motion Limited.
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without 
 * restriction, including without limitation the rights to use, 
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the 
 * Software is furnished to do so, subject to the following