1 /*
   2  * Copyright 2002 Sun Microsystems, Inc.  All Rights Reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.asm.sparc;
  26 
  27 import sun.jvm.hotspot.asm.*;
  28 
  29 public class SPARCLogicInstruction extends SPARCFormat3AInstruction
  30     implements LogicInstruction {
  31     final private int operation;
  32 
  33     public SPARCLogicInstruction(String name, int opcode, int operation, SPARCRegister rs1,
  34                                  ImmediateOrRegister operand2, SPARCRegister rd) {
  35         super(name, opcode, rs1, operand2, rd);
  36         this.operation = operation;
  37     }
  38 
  39     protected String getDescription() {
  40         SPARCRegister G0 = SPARCRegisters.G0;
  41         if (opcode == ORcc && rd == G0 && rd == operand2) {
  42             StringBuffer buf = new StringBuffer();
  43             buf.append("tst");
  44             buf.append(spaces);
  45             buf.append(getOperand2String());
  46             return buf.toString();
  47         } else if (opcode == XNOR && G0 == operand2) {
  48             StringBuffer buf = new StringBuffer();
  49             buf.append("not");
  50             buf.append(spaces);
  51             buf.append(rs1.toString());
  52             if (rs1 != rd) {
  53                 buf.append(comma);
  54                 buf.append(rd.toString());
  55             }
  56             return buf.toString();
  57         } else if (opcode == ANDcc && rd == G0) {
  58             StringBuffer buf = new StringBuffer();
  59             buf.append("btst");
  60             buf.append(spaces);
  61             buf.append(getOperand2String());
  62             buf.append(comma);
  63             buf.append(rd.toString());
  64             return buf.toString();
  65         } else if (rs1 == rd) {
  66             StringBuffer buf = new StringBuffer();
  67             switch (opcode) {
  68                 case OR:
  69                     buf.append("bset");
  70                     break;
  71                 case ANDN:
  72                     buf.append("bclr");
  73                     break;
  74                 case XOR:
  75                     buf.append("btog");
  76                     break;
  77                 default:
  78                     return super.getDescription();
  79             }
  80             buf.append(spaces);
  81             buf.append(getOperand2String());
  82             buf.append(comma);
  83             buf.append(rd.toString());
  84             return buf.toString();
  85         } else {
  86             return super.getDescription();
  87         }
  88     }
  89 
  90     public Operand getLogicDestination() {
  91         return getDestinationRegister();
  92     }
  93 
  94     public Operand[] getLogicSources() {
  95         return (new Operand[] { rs1, operand2 });
  96     }
  97 
  98     public int getOperation() {
  99         return operation;
 100     }
 101 
 102     public boolean isLogic() {
 103         return true;
 104     }
 105 }