hotspot/agent/src/share/classes/sun/jvm/hotspot/asm/sparc/SPARCLogicInstruction.java

/*
 * Copyright 2002 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

package sun.jvm.hotspot.asm.sparc;

import sun.jvm.hotspot.asm.*;

public class SPARCLogicInstruction extends SPARCFormat3AInstruction
    implements LogicInstruction {
    final private int operation;

    public SPARCLogicInstruction(String name, int opcode, int operation, SPARCRegister rs1,
                                 ImmediateOrRegister operand2, SPARCRegister rd) {
        super(name, opcode, rs1, operand2, rd);
        this.operation = operation;
    }

    protected String getDescription() {
        SPARCRegister G0 = SPARCRegisters.G0;
        if (opcode == ORcc && rd == G0 && rd == operand2) {
            StringBuffer buf = new StringBuffer();
            buf.append("tst");
            buf.append(spaces);
            buf.append(getOperand2String());
            return buf.toString();
        } else if (opcode == XNOR && G0 == operand2) {
            StringBuffer buf = new StringBuffer();
            buf.append("not");
            buf.append(spaces);
            buf.append(rs1.toString());
            if (rs1 != rd) {
                buf.append(comma);
                buf.append(rd.toString());
            }
            return buf.toString();
        } else if (opcode == ANDcc && rd == G0) {
            StringBuffer buf = new StringBuffer();
            buf.append("btst");
            buf.append(spaces);
            buf.append(getOperand2String());
            buf.append(comma);
            buf.append(rd.toString());
            return buf.toString();
        } else if (rs1 == rd) {
            StringBuffer buf = new StringBuffer();
            switch (opcode) {
                case OR:
                    buf.append("bset");
                    break;
                case ANDN:
                    buf.append("bclr");
                    break;
                case XOR:
                    buf.append("btog");
                    break;
                default:
                    return super.getDescription();
            }
            buf.append(spaces);
            buf.append(getOperand2String());
            buf.append(comma);
            buf.append(rd.toString());
            return buf.toString();
        } else {
            return super.getDescription();
        }
    }

    public Operand getLogicDestination() {
        return getDestinationRegister();
    }

    public Operand[] getLogicSources() {
        return (new Operand[] { rs1, operand2 });
    }

    public int getOperation() {
        return operation;
    }

    public boolean isLogic() {
        return true;
    }
}