/*
 * Copyright (c) 2011, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.max.asm;

/**
 * A collection of static utility functions that check ranges of numbers.
 */
public class NumUtil {
    public static boolean isShiftCount(int x) {
        return 0 <= x && x < 32;
    }

    /**
     * Determines if a given {@code int} value is the range of unsigned byte
     * values.
     */
    public static boolean isUByte(int x) {
        return (x & 0xff) == x;
    }

    /**
     * Determines if a given {@code int} value is the range of signed byte
     * values.
     */
    public static boolean isByte(int x) {
        return (byte) x == x;
    }

    /**
     * Determines if a given {@code long} value is the range of unsigned byte
     * values.
     */
    public static boolean isUByte(long x) {
        return (x & 0xffL) == x;
    }

    /**
     * Determines if a given {@code long} value is the range of signed byte
     * values.
     */
    public static boolean isByte(long l) {
        return (byte) l == l;
    }

    /**
     * Determines if a given {@code long} value is the range of unsigned int
     * values.
     */
    public static boolean isUInt(long x) {
        return (x & 0xffffffffL) == x;
    }

    /**
     * Determines if a given {@code long} value is the range of signed int
     * values.
     */
    public static boolean isInt(long l) {
        return (int) l == l;
    }

    /**
     * Determines if a given {@code int} value is the range of signed short
     * values.
     */
    public static boolean isShort(int x) {
        return (short) x == x;
    }

    public static boolean isUShort(int s) {
        return s == (s & 0xFFFF);
    }

    public static boolean is32bit(long x) {
        return -0x80000000L <= x && x < 0x80000000L;
    }

    public static short safeToShort(int v) {
        assert isShort(v);
        return (short) v;
    }
}