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annotate graal/com.oracle.graal.asm/src/com/oracle/max/asm/NumUtil.java @ 6497:64b7dd2075c0

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renamed projects com.oracle.max.asm* to com.oracle.graal.asm*
author Doug Simon <doug.simon@oracle.com>
date Wed, 03 Oct 2012 17:42:12 +0200
parents graal/com.oracle.max.asm/src/com/oracle/max/asm/NumUtil.java@681e969888a7
children
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1 /*
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2 * Copyright (c) 2011, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.max.asm;
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24
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25 /**
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26 * A collection of static utility functions that check ranges of numbers.
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27 */
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28 public class NumUtil {
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29 public static boolean isShiftCount(int x) {
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30 return 0 <= x && x < 32;
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31 }
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32
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33 /**
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34 * Determines if a given {@code int} value is the range of unsigned byte
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35 * values.
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36 */
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37 public static boolean isUByte(int x) {
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38 return (x & 0xff) == x;
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39 }
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41 /**
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42 * Determines if a given {@code int} value is the range of signed byte
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43 * values.
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44 */
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45 public static boolean isByte(int x) {
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46 return (byte) x == x;
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47 }
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48
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49 /**
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50 * Determines if a given {@code long} value is the range of unsigned byte
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51 * values.
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52 */
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53 public static boolean isUByte(long x) {
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54 return (x & 0xffL) == x;
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55 }
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57 /**
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58 * Determines if a given {@code long} value is the range of signed byte
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59 * values.
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60 */
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61 public static boolean isByte(long l) {
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62 return (byte) l == l;
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63 }
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64
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65 /**
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66 * Determines if a given {@code long} value is the range of unsigned int
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67 * values.
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68 */
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69 public static boolean isUInt(long x) {
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70 return (x & 0xffffffffL) == x;
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71 }
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72
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73 /**
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74 * Determines if a given {@code long} value is the range of signed int
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75 * values.
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76 */
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77 public static boolean isInt(long l) {
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78 return (int) l == l;
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79 }
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80
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81 /**
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82 * Determines if a given {@code int} value is the range of signed short
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83 * values.
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84 */
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85 public static boolean isShort(int x) {
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86 return (short) x == x;
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87 }
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88
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89 public static boolean isUShort(int s) {
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90 return s == (s & 0xFFFF);
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91 }
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92
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93 public static boolean is32bit(long x) {
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94 return -0x80000000L <= x && x < 0x80000000L;
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95 }
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96
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97 public static short safeToShort(int v) {
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98 assert isShort(v);
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99 return (short) v;
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100 }
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101
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102 public static int roundUp(int number, int mod) {
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103 return ((number + mod - 1) / mod) * mod;
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104 }
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105 }