Mercurial > hg > truffle
view graal/com.oracle.max.asmdis/src/com/sun/max/asm/ppc/CRF.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | bc8527f3071c |
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/* * Copyright (c) 2007, 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.sun.max.asm.ppc; import com.sun.max.asm.*; import com.sun.max.util.*; /** * The constants denoting the eight 4-bit fields into which the 32-bit Condition Register * is logically partitioned. */ public enum CRF implements EnumerableArgument<CRF> { CR0, CR1, CR2, CR3, CR4, CR5, CR6, CR7; /** * Determines if a mask of bits only selects one of the 8 condition register fields. */ public static boolean isExactlyOneCRFSelected(int mask) { return (mask & (mask - 1)) == 0 && mask > 0 && mask <= 128; } public int value() { return ordinal(); } public long asLong() { return value(); } public String externalValue() { return Integer.toString(ordinal()); } public String disassembledValue() { return externalValue(); } public Enumerator<CRF> enumerator() { return ENUMERATOR; } public CRF exampleValue() { return CR0; } /** * Given the index of a bit within this 4-bit field, returns the index of the same bit * in the 32-bit Condition Register. * * @throws IllegalArgumentException if n is not between 0 and 3 inclusive */ public int bitFor(int n) { if (n < 0 || n > 3) { throw new IllegalArgumentException("bit specifier must be between 0 and 3"); } return ordinal() * 4 + n; } /** * @return the index of the bit within the 32-bit Condition Register corresponding to the <i>less than</i> bit in this Condition Register field */ public int lt() { return bitFor(LT); } /** * @return the index of the bit within the 32-bit Condition Register corresponding to the <i>greater than</i> bit in this Condition Register field */ public int gt() { return bitFor(GT); } /** * @return the index of the bit within the 32-bit Condition Register corresponding to the <i>equal</i> bit in this Condition Register field */ public int eq() { return bitFor(EQ); } /** * @return the index of the bit within the 32-bit Condition Register corresponding to the <i>summary overflow</i> bit in this Condition Register field */ public int so() { return bitFor(SO); } /** * @return the index of the bit within the 32-bit Condition Register corresponding to the <i>unordered (after floating-point comparison)</i> bit in this Condition Register field */ public int un() { return bitFor(UN); } /** * Index of the bit in a 4-bit Condition Register field indicating a <i>less than</i> condition. */ public static final int LT = 0; /** * Index of the bit in a 4-bit Condition Register field indicating a <i>greater than</i> condition. */ public static final int GT = 1; /** * Index of the bit in a 4-bit Condition Register field indicating an <i>equal</i> condition. */ public static final int EQ = 2; /** * Index of the bit in a 4-bit Condition Register field indicating a <i>summary overflow</i> condition. */ public static final int SO = 3; /** * Index of the bit in a 4-bit Condition Register field indicating an <i>unordered (after floating-point comparison)</i> condition. */ public static final int UN = 3; public static final Enumerator<CRF> ENUMERATOR = new Enumerator<CRF>(CRF.class); }