/*
* 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.arm;
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;
}