Mercurial > hg > truffle
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.max.asmdis/src/com/sun/max/asm/ppc/CRF.java Sat Dec 17 19:59:18 2011 +0100 @@ -0,0 +1,142 @@ +/* + * 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); + +}