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 import sun.jvm.hotspot.utilities.Assert;
  29 
  30 class V9FMOVccDecoder extends V9CMoveDecoder implements /* imports */ RTLDataTypes {
  31     private final int opf;
  32     private final int dataType;
  33 
  34     V9FMOVccDecoder(int opf, int dataType) {
  35         this.opf = opf;
  36         this.dataType = dataType;
  37     }
  38 
  39     private static String getFMoveCCName(int conditionCode, int conditionFlag, int dataType) {
  40         StringBuffer buf = new StringBuffer("fmov");
  41         buf.append(getFloatTypeCode(dataType));
  42         buf.append(getConditionName(conditionCode, conditionFlag));
  43         return buf.toString();
  44     }
  45 
  46     private static int getFMoveConditionFlag(int instruction) {
  47         return (instruction & OPF_CC_MASK) >>> OPF_CC_START_BIT;
  48     }
  49 
  50     Instruction decode(int instruction, SPARCInstructionFactory factory) {
  51         SPARCV9InstructionFactory v9factory = (SPARCV9InstructionFactory) factory;
  52         Instruction instr = null;
  53         int conditionFlag = getFMoveConditionFlag(instruction);
  54         if (conditionFlag == CFLAG_RESERVED1 || conditionFlag == CFLAG_RESERVED2) {
  55             instr = v9factory.newIllegalInstruction(instruction);
  56         } else {
  57             int rdNum = getDestinationRegister(instruction);
  58             int rs1Num = getSourceRegister1(instruction);
  59             SPARCRegister rd = RegisterDecoder.decode(dataType, rdNum);
  60             int conditionCode = getMoveConditionCode(instruction);
  61             SPARCRegister rs = RegisterDecoder.decode(dataType, rs1Num);
  62             String name = getFMoveCCName(conditionCode, conditionFlag, dataType);
  63             instr = v9factory.newV9FMOVccInstruction(name,opf, conditionCode, conditionFlag,
  64                                (SPARCFloatRegister)rs, (SPARCFloatRegister)rd);
  65         }
  66 
  67         return instr;
  68     }
  69 }