Mercurial > hg > truffle
view graal/com.oracle.max.asmdis/src/com/sun/max/asm/ppc/ZeroOrRegister.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 |
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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 super type of all the {@link GPR General Purpose Registers} and the constant {@link Zero#ZERO}. */ public abstract class ZeroOrRegister extends AbstractSymbolicArgument { ZeroOrRegister(String name, int value) { super(name, value); } /** * Determines if this register specifier is outside the range of registers * {@code [target .. target+n]} where the range * wraps at 32. */ public boolean isOutsideRegisterRange(GPR target, int n) { final int rt = target.value(); final int ra = value(); final int numRegs = (n + 3) / 4; final int lastReg = (rt + numRegs - 1) % 32; final boolean wrapsAround = lastReg < rt; if (wrapsAround) { return lastReg < ra && ra < rt; } return ra < rt || lastReg < ra; } public static Symbolizer<ZeroOrRegister> symbolizer() { if (symbolizer == null) { symbolizer = Symbolizer.Static.fromList(ZeroOrRegister.class, GPR.GPR_SYMBOLIZER, Zero.ZERO); } return symbolizer; } // This must be lazily constructed to avoid dependency on the GPR class initializer private static Symbolizer<ZeroOrRegister> symbolizer; }