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 class V9MOVccDecoder extends V9CMoveDecoder {
  30     private static String getMoveCCName(int conditionCode, int conditionFlag) {
  31         return "mov" + getConditionName(conditionCode, conditionFlag);
  32     }
  33 
  34     private static int getMoveConditionFlag(int instruction) {
  35         boolean cc2Bit = (instruction & CMOVE_CC2_MASK) != 0;
  36         int conditionFlag = (instruction & CMOVE_CC0_CC1_MASK) >>> CMOVE_CC_START_BIT;
  37         if (cc2Bit) conditionFlag |= (0x4); // 100;
  38         return conditionFlag;
  39     }
  40 
  41     Instruction decode(int instruction, SPARCInstructionFactory factory) {
  42         SPARCV9InstructionFactory v9factory = (SPARCV9InstructionFactory) factory;
  43         Instruction instr = null;
  44         int conditionFlag = getMoveConditionFlag(instruction);
  45         if (conditionFlag == CFLAG_RESERVED1 || conditionFlag == CFLAG_RESERVED2) {
  46             instr = v9factory.newIllegalInstruction(instruction);
  47         } else {
  48             int rdNum = getDestinationRegister(instruction);
  49             SPARCRegister rd = SPARCRegisters.getRegister(rdNum);
  50             int conditionCode = getMoveConditionCode(instruction);
  51             ImmediateOrRegister source = getCMoveSource(instruction, 11);
  52             String name = getMoveCCName(conditionCode, conditionFlag);
  53             instr = v9factory.newV9MOVccInstruction(name, conditionCode, conditionFlag, source, rd);
  54         }
  55 
  56         return instr;
  57     }
  58 }