/*
 * Copyright (c) 2002, 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 sun.jvm.hotspot.asm.sparc;

import sun.jvm.hotspot.asm.*;

class ReadDecoder extends ReadWriteDecoder {
    ReadDecoder(int specialRegNum) {
        super(specialRegNum);
    }

    Instruction decodeReadWrite(int instruction, SPARCInstructionFactory factory,
                                int rs1Num, int rdNum) {
        Instruction instr = null;
        int specialReg = specialRegNum;
        if (rs1Num == 0)
            specialReg = SPARCSpecialRegisters.Y;
        if (rs1Num == 15 && rdNum == 0) {
            instr = factory.newStbarInstruction();
        } else {
            instr = factory.newReadInstruction(specialReg, rs1Num,
                                  SPARCRegisters.getRegister(rdNum));
        }
        return instr;
    }
}